493 lines
12 KiB
Go
493 lines
12 KiB
Go
package core
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"os"
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"time"
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evopt "github.com/andig/evopt/client"
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"github.com/evcc-io/evcc/api"
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"github.com/evcc-io/evcc/core/loadpoint"
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"github.com/evcc-io/evcc/core/metrics"
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"github.com/evcc-io/evcc/tariff"
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"github.com/evcc-io/evcc/util/config"
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"github.com/evcc-io/evcc/util/request"
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"github.com/evcc-io/evcc/util/sponsor"
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"github.com/jinzhu/now"
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"github.com/samber/lo"
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)
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var (
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eta = float32(0.9) // efficiency of the battery charging/discharging
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batteryPower = float32(6000) // default power of the battery in W
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updated time.Time
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)
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type batteryType string
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const (
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batteryTypeLoadpoint batteryType = "loadpoint"
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batteryTypeVehicle batteryType = "vehicle"
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batteryTypeBattery batteryType = "battery"
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)
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type batteryDetail struct {
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Type batteryType `json:"type"`
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Title string `json:"title,omitempty"`
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Name string `json:"name,omitempty"`
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Capacity float64 `json:"capacity,omitempty"`
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}
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type responseDetails struct {
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Timestamps []time.Time `json:"timestamp"`
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BatteryDetails []batteryDetail `json:"batteryDetails"`
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}
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func (site *Site) optimizerUpdateAsync(battery []measurement) {
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if time.Since(updated) < 5*time.Minute {
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return
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}
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var err error
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defer func() {
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if r := recover(); r != nil {
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err = fmt.Errorf("panic %v", r)
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}
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if err != nil {
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site.log.ERROR.Println("optimizer:", err)
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}
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}()
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err = site.optimizerUpdate(battery)
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updated = time.Now()
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}
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func (site *Site) optimizerUpdate(battery []measurement) error {
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uri := os.Getenv("EVOPT_URI")
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if uri == "" {
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return nil
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}
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solar := currentRates(site.GetTariff(api.TariffUsageSolar))
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grid := currentRates(site.GetTariff(api.TariffUsageGrid))
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feedIn := currentRates(site.GetTariff(api.TariffUsageFeedIn))
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minLen := lo.Min([]int{len(grid), len(feedIn), len(solar)})
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if minLen < 8 {
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return fmt.Errorf("not enough slots for optimization: %d (grid=%d, feedIn=%d, solar=%d)", minLen, len(grid), len(feedIn), len(solar))
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}
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dt := timeSteps(minLen)
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firstSlotDuration := time.Duration(dt[0]) * time.Second
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site.log.DEBUG.Printf("optimizer: optimizing %d slots until %v: grid=%d, feedIn=%d, solar=%d, first slot: %v",
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minLen,
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grid[minLen-1].End.Local(),
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len(grid), len(feedIn), len(solar),
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firstSlotDuration,
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)
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gt, err := site.homeProfile(minLen, firstSlotDuration)
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if err != nil {
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return err
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}
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solarEnergy, err := ratesToEnergy(solar, firstSlotDuration)
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if err != nil {
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return err
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}
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req := evopt.OptimizationInput{
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Strategy: evopt.OptimizerStrategy{
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ChargingStrategy: evopt.OptimizerStrategyChargingStrategyChargeBeforeExport, // AttenuateGridPeaks
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DischargingStrategy: evopt.OptimizerStrategyDischargingStrategyDischargeBeforeImport,
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},
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EtaC: eta,
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EtaD: eta,
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TimeSeries: evopt.TimeSeries{
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Dt: dt,
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Gt: asFloat32(gt),
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PN: maxValues(grid, 1e3, minLen),
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PE: maxValues(feedIn, 1e3, minLen),
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Ft: maxValues(solarEnergy, 1, minLen),
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},
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}
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// end of horizon Wh value
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pa := lo.Min(req.TimeSeries.PN) * eta * 0.99
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details := responseDetails{
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Timestamps: asTimestamps(dt),
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}
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for _, lp := range site.Loadpoints() {
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// ignore disconnected loadpoints
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if lp.GetStatus() == api.StatusA {
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continue
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}
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v := lp.GetVehicle()
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if v == nil || v.Capacity() == 0 {
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continue
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}
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bat := evopt.BatteryConfig{
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ChargeFromGrid: true,
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CMin: float32(lp.EffectiveMinPower()),
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CMax: float32(lp.EffectiveMaxPower()),
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DMax: 0,
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SMin: 0,
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PA: pa,
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}
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if profile := loadpointProfile(lp, firstSlotDuration, minLen); profile != nil {
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bat.PDemand = asFloat32(profile)
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}
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detail := batteryDetail{
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Type: batteryTypeLoadpoint,
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Title: lp.GetTitle(),
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}
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// vehicle
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maxSoc := v.Capacity() * 1e3 // Wh
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if v := lp.EffectiveLimitSoc(); v > 0 {
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maxSoc *= float64(v) / 100
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} else if v := lp.GetLimitEnergy(); v > 0 {
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maxSoc = v * 1e3
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}
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bat.SInitial = float32(v.Capacity() * lp.GetSoc() * 10) // Wh
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bat.SMax = max(bat.SInitial, float32(maxSoc)) // prevent infeasible if current soc above maximum
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detail.Type = batteryTypeVehicle
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detail.Capacity = v.Capacity()
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if vt := v.GetTitle(); vt != "" {
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if detail.Title != "" {
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detail.Title += " – "
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}
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detail.Title += vt
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}
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// find vehicle name/id
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for _, dev := range config.Vehicles().Devices() {
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if dev.Instance() == v {
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detail.Name = dev.Config().Name
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}
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}
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switch lp.GetMode() {
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case api.ModeOff:
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// disable charging
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bat.CMax = 0
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case api.ModeNow, api.ModeMinPV:
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// forced min/max charging
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bat.PDemand = continuousDemand(lp, minLen)
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case api.ModePV:
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// add plan goal
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goal, socBased := lp.GetPlanGoal()
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if goal > 0 {
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if v := lp.GetVehicle(); socBased && v != nil {
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goal *= v.Capacity() * 10
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}
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}
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if ts := lp.EffectivePlanTime(); !ts.IsZero() {
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// TODO precise slot placement
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if slot := int(time.Until(ts) / tariff.SlotDuration); slot < minLen {
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bat.SGoal = lo.RepeatBy(minLen, func(_ int) float32 { return 0 })
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bat.SGoal[slot] = float32(goal)
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} else {
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site.log.WARN.Printf("plan beyond forecast range: %.1f at %v", goal, ts.Round(time.Minute))
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}
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}
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}
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req.Batteries = append(req.Batteries, bat)
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details.BatteryDetails = append(details.BatteryDetails, detail)
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}
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for i, b := range battery {
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if b.Capacity == nil || *b.Capacity == 0 || b.Soc == nil {
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continue
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}
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dev := site.batteryMeters[i]
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bat := evopt.BatteryConfig{
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CMax: batteryPower,
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DMax: batteryPower,
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SInitial: float32(*b.Capacity * *b.Soc * 10), // Wh
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PA: pa,
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}
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bat.SMax = max(bat.SInitial, float32(*b.Capacity*1e3)) // Wh
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instance := dev.Instance()
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if _, ok := instance.(api.BatteryController); ok {
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bat.ChargeFromGrid = true
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}
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if m, ok := instance.(api.BatteryPowerLimiter); ok {
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charge, discharge := m.GetPowerLimits()
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bat.CMax = float32(charge)
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bat.DMax = float32(discharge)
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}
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if m, ok := instance.(api.BatterySocLimiter); ok {
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min, max := m.GetSocLimits()
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bat.SMin = float32(*b.Capacity * float64(min) * 10) // Wh
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bat.SMax = float32(*b.Capacity * float64(max) * 10) // Wh
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}
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req.Batteries = append(req.Batteries, bat)
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details.BatteryDetails = append(details.BatteryDetails, batteryDetail{
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Type: batteryTypeBattery,
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Name: dev.Config().Name,
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Title: deviceProperties(dev).Title,
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Capacity: *b.Capacity,
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})
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}
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httpClient := request.NewClient(site.log)
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httpClient.Timeout = 30 * time.Second
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apiClient, err := evopt.NewClientWithResponses(uri, evopt.WithHTTPClient(httpClient))
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if err != nil {
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return err
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}
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resp, err := apiClient.PostOptimizeChargeScheduleWithResponse(context.TODO(), req, func(_ context.Context, req *http.Request) error {
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if sponsor.IsAuthorized() {
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req.Header.Set("Authorization", "Bearer "+sponsor.Token)
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}
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return nil
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})
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if err != nil {
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return err
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}
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if resp.StatusCode() == http.StatusInternalServerError {
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return errors.New(resp.JSON500.Message)
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}
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if resp.StatusCode() == http.StatusBadRequest {
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return errors.New(resp.JSON400.Message)
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}
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if resp.StatusCode() != http.StatusOK {
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return fmt.Errorf("invalid status: %d", resp.StatusCode())
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}
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site.publish("evopt", struct {
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Req evopt.OptimizationInput `json:"req"`
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Res evopt.OptimizationResult `json:"res"`
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Details responseDetails `json:"details"`
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}{
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Req: req,
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Res: *resp.JSON200,
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Details: details,
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})
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return nil
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}
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// continuousDemand creates a slice of power demands depending on loadpoint mode
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func continuousDemand(lp loadpoint.API, minLen int) []float32 {
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if lp.GetStatus() != api.StatusC {
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return nil
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}
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pwr := lp.EffectiveMaxPower()
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if lp.GetMode() == api.ModeMinPV {
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pwr = lp.EffectiveMinPower()
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}
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return lo.RepeatBy(minLen, func(_ int) float32 {
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return float32(pwr)
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})
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}
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// loadpointProfile returns the loadpoint's charging profile in Wh
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// TODO consider charging efficiency
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func loadpointProfile(lp loadpoint.API, firstSlotDuration time.Duration, minLen int) []float64 {
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mode := lp.GetMode()
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status := lp.GetStatus()
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if status != api.StatusC || (mode != api.ModeMinPV && mode != api.ModeNow) {
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return nil
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}
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power := lp.GetChargePower()
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if minP := lp.EffectiveMinPower(); mode == api.ModeMinPV && minP < power {
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power = minP
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}
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energy := lp.GetRemainingEnergy() * 1e3 // Wh
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energyKnown := energy > 0
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res := make([]float64, 0, minLen)
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for i := range minLen {
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d := 1.0 // hours
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if i == 0 {
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d = firstSlotDuration.Hours()
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}
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deltaEnergy := power * d // Wh
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if energyKnown && deltaEnergy >= energy {
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deltaEnergy = energy
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}
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energy -= deltaEnergy
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res = append(res, deltaEnergy)
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}
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return res
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}
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// homeProfile returns the home base load in Wh
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func (site *Site) homeProfile(minLen int, firstSlotDuration time.Duration) ([]float64, error) {
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// kWh over last 30 days
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profile, err := metrics.Profile(now.BeginningOfDay().AddDate(0, 0, -30))
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if err != nil {
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return nil, err
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}
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// max 4 days
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slots := make([]float64, 0, minLen+1)
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for len(slots) <= minLen+24*4 { // allow for prorating first day
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slots = append(slots, profile[:]...)
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}
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res := prorateFirstSlot(slots, firstSlotDuration)
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if len(res) < minLen {
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return nil, fmt.Errorf("minimum home profile length %d is less than required %d", len(res), minLen)
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}
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if len(res) > minLen {
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res = res[:minLen]
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}
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// convert to Wh
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return lo.Map(res, func(v float64, i int) float64 {
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return v * 1e3
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}), nil
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}
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// prorateFirstSlot strips away any slots before "now" and prorates the first slot based on remaining time in current slot.
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// The profile contains 48 15min slots (00:00-23:45) that repeat for multiple days.
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func prorateFirstSlot(profile []float64, firstSlotDuration time.Duration) []float64 {
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firstSlot := int(time.Now().Truncate(tariff.SlotDuration).Sub(now.BeginningOfDay()) / tariff.SlotDuration)
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// Take only slots from current hour onwards
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res := profile[firstSlot:]
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res[0] *= float64(firstSlotDuration) / float64(tariff.SlotDuration)
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return res
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}
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func ratesToEnergy(rr api.Rates, firstSlot time.Duration) (api.Rates, error) {
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res := make(api.Rates, 0, len(rr))
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for _, r := range rr {
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from := r.Start
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if len(res) == 0 {
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from = r.End.Add(-firstSlot)
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}
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if _, err := rr.At(from); err != nil {
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return nil, fmt.Errorf("missing solar data for: %v", from)
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}
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energy := solarEnergy(rr, from, r.End)
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if energy < 0 {
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return nil, fmt.Errorf("negative solar energy from %v to %v: %.3f", from, r.End, energy)
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}
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res = append(res, api.Rate{
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Start: from,
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End: r.End,
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Value: energy,
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})
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}
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return res, nil
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}
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func asFloat32(gt []float64) []float32 {
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return lo.Map(gt, func(v float64, i int) float32 {
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return float32(v)
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})
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}
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func endOfHour(ts time.Time) time.Time {
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return ts.Truncate(time.Hour).Add(time.Hour)
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}
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func currentRates(tariff api.Tariff) api.Rates {
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if tariff == nil {
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return nil
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}
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rates, err := tariff.Rates()
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if err != nil {
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return nil
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}
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// filter past slots
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now := time.Now()
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return lo.Filter(rates, func(slot api.Rate, _ int) bool {
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return slot.End.After(now)
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})
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}
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func timeSteps(minLen int) []int {
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res := make([]int, 0, minLen)
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bos := time.Now().Truncate(tariff.SlotDuration)
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eos := bos.Add(tariff.SlotDuration)
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if d := time.Until(eos); d > time.Second && d < tariff.SlotDuration {
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res = append(res, int(d.Seconds()))
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}
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for i := len(res); i < minLen; i++ {
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res = append(res, int(tariff.SlotDuration.Seconds())) // 15min slots
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}
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return res
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}
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func asTimestamps(dt []int) []time.Time {
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res := make([]time.Time, 0, len(dt))
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eoh := endOfHour(time.Now())
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res = append(res, eoh.Add(-time.Duration(dt[0])*time.Second))
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for i := range len(res) - 1 {
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res = append(res, eoh.Add(time.Duration(dt[i+1])*time.Second))
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}
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return res
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}
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func maxValues(rates []api.Rate, div float64, maxLen int) []float32 {
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res := make([]float32, 0, maxLen)
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for _, slot := range rates {
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res = append(res, float32(slot.Value/div))
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if len(res) >= maxLen {
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break
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}
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}
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return res
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}
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