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Diffstat (limited to 'src/home/inverter/monitor.py')
| -rw-r--r-- | src/home/inverter/monitor.py | 448 |
1 files changed, 448 insertions, 0 deletions
diff --git a/src/home/inverter/monitor.py b/src/home/inverter/monitor.py new file mode 100644 index 0000000..02ae155 --- /dev/null +++ b/src/home/inverter/monitor.py @@ -0,0 +1,448 @@ +import logging +import time + +from enum import Enum, auto +from threading import Thread +from typing import Callable, Optional +from .inverter_wrapper import wrapper_instance as inverter +from inverterd import InverterError +from ..util import Stopwatch, StopwatchError +from ..config import config + +logger = logging.getLogger(__name__) + + +class BatteryPowerDirection(Enum): + DISCHARGING = auto() + CHARGING = auto() + DO_NOTHING = auto() + + +class ChargingEvent(Enum): + AC_CHARGING_UNAVAILABLE_BECAUSE_SOLAR = auto() + AC_NOT_CHARGING = auto() + AC_CHARGING_STARTED = auto() + AC_DISCONNECTED = auto() + AC_CURRENT_CHANGED = auto() + AC_MOSTLY_CHARGED = auto() + AC_CHARGING_FINISHED = auto() + + +class ChargingState(Enum): + NOT_CHARGING = auto() + AC_BUT_SOLAR = auto() + AC_WAITING = auto() + AC_OK = auto() + AC_DONE = auto() + + +class CurrentChangeDirection(Enum): + UP = auto() + DOWN = auto() + + +class BatteryState(Enum): + NORMAL = auto() + LOW = auto() + CRITICAL = auto() + + +def _pd_from_string(pd: str) -> BatteryPowerDirection: + if pd == 'Discharge': + return BatteryPowerDirection.DISCHARGING + elif pd == 'Charge': + return BatteryPowerDirection.CHARGING + elif pd == 'Do nothing': + return BatteryPowerDirection.DO_NOTHING + else: + raise ValueError(f'invalid power direction: {pd}') + + +class MonitorConfig: + def __getattr__(self, item): + return config['monitor'][item] + + +cfg = MonitorConfig() + + +class InverterMonitor(Thread): + charging_event_handler: Optional[Callable] + battery_event_handler: Optional[Callable] + error_handler: Optional[Callable] + + def __init__(self): + super().__init__() + self.setName('InverterMonitor') + + self.interrupted = False + self.min_allowed_current = 0 + + # Event handlers for the bot. + self.charging_event_handler = None + self.battery_event_handler = None + self.error_handler = None + + # Currents list, defined in the bot config. + self.currents = cfg.gen_currents + self.currents.sort() + + # We start charging at lowest possible current, then increase it once per minute (or so) to the maximum level. + # This is done so that the load on the generator increases smoothly, not abruptly. Generator will thank us. + self.current_change_direction = CurrentChangeDirection.UP + self.next_current_enter_time = 0 + self.active_current_idx = -1 + + self.battery_state = BatteryState.NORMAL + self.charging_state = ChargingState.NOT_CHARGING + + # 'Mostly-charged' means that we've already lowered the charging current to the level + # at which batteries are charging pretty slow. So instead of burning gasoline and shaking the air, + # we can just turn the generator off at this point. + self.mostly_charged = False + + # The stopwatch is used to measure how long does the battery voltage exceeds the float voltage level. + # We don't want to damage our batteries, right? + self.floating_stopwatch = Stopwatch() + + @property + def active_current(self) -> Optional[int]: + try: + if self.active_current_idx < 0: + return None + return self.currents[self.active_current_idx] + except IndexError: + return None + + def run(self): + # Check allowed currents and validate the config. + allowed_currents = list(inverter.exec('get-allowed-ac-charging-currents')['data']) + allowed_currents.sort() + + for a in self.currents: + if a not in allowed_currents: + raise ValueError(f'invalid value {a} in gen_currents list') + + self.min_allowed_current = min(allowed_currents) + + # Read data and run implemented programs every 2 seconds. + while not self.interrupted: + try: + response = inverter.exec('get-status') + if response['result'] != 'ok': + logger.error('get-status failed:', response) + else: + gs = response['data'] + + ac = gs['grid_voltage']['value'] > 0 or gs['grid_freq']['value'] > 0 + solar = gs['pv1_input_power']['value'] > 0 + v = float(gs['battery_voltage']['value']) + load_watts = int(gs['ac_output_active_power']['value']) + pd = _pd_from_string(gs['battery_power_direction']) + + logger.debug(f'got status: ac={ac}, solar={solar}, v={v}, pd={pd}') + + self.gen_charging_program(ac, solar, v, pd) + + if not ac or pd != BatteryPowerDirection.CHARGING: + # if AC is disconnected or not charging, run the low voltage checking program + self.low_voltage_program(v, load_watts) + + elif self.battery_state != BatteryState.NORMAL: + # AC is connected and the battery is charging, assume battery level is normal + self.battery_state = BatteryState.NORMAL + + except InverterError as e: + logger.exception(e) + + time.sleep(2) + + def gen_charging_program(self, + ac: bool, # whether AC is connected + solar: bool, # whether MPPT is active + v: float, # current battery voltage + pd: BatteryPowerDirection # current power direction + ): + if self.charging_state == ChargingState.NOT_CHARGING: + if ac and solar: + # Not charging because MPPT is active (solar line is connected). + # Notify users about it and change the current state. + self.charging_state = ChargingState.AC_BUT_SOLAR + self.charging_event_handler(ChargingEvent.AC_CHARGING_UNAVAILABLE_BECAUSE_SOLAR) + logger.info('entering AC_BUT_SOLAR state') + elif ac: + # Not charging, but AC is connected and ready to use. + # Start the charging program. + self.gen_start(pd) + + elif self.charging_state == ChargingState.AC_BUT_SOLAR: + if not ac: + # AC charger has been disconnected. Since the state is AC_BUT_SOLAR, + # charging probably never even started. Stop the charging program. + self.gen_stop(ChargingState.NOT_CHARGING) + elif not solar: + # MPPT has been disconnected, and, since AC is still connected, we can + # try to start the charging program. + self.gen_start(pd) + + elif self.charging_state in (ChargingState.AC_OK, ChargingState.AC_WAITING): + if not ac: + # Charging was in progress, but AC has been suddenly disconnected. + # Sad, but what can we do? Stop the charging program and return. + self.gen_stop(ChargingState.NOT_CHARGING) + return + + if solar: + # Charging was in progress, but MPPT has been detected. Inverter doesn't charge + # batteries from AC when MPPT is active, so we have to pause our program. + self.charging_state = ChargingState.AC_BUT_SOLAR + self.charging_event_handler(ChargingEvent.AC_CHARGING_UNAVAILABLE_BECAUSE_SOLAR) + try: + self.floating_stopwatch.pause() + except StopwatchError: + msg = 'gen_charging_program: floating_stopwatch.pause() failed at (1)' + logger.warning(msg) + self.error_handler(msg) + logger.info('solar power connected during charging, entering AC_BUT_SOLAR state') + + # No surprises at this point, just check the values and make decisions based on them. + # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + # We've reached the 'mostly-charged' point, the voltage level is not float, + # but inverter decided to stop charging (or somebody used a kettle, lol). + # Anyway, assume that charging is complete, stop the program, notify users and return. + if self.mostly_charged and v > (cfg.gen_floating_v - 1) and pd != BatteryPowerDirection.CHARGING: + self.gen_stop(ChargingState.AC_DONE) + return + + # Monitor inverter power direction and notify users when it changes. + state = ChargingState.AC_OK if pd == BatteryPowerDirection.CHARGING else ChargingState.AC_WAITING + if state != self.charging_state: + self.charging_state = state + + evt = ChargingEvent.AC_CHARGING_STARTED if state == ChargingState.AC_OK else ChargingEvent.AC_NOT_CHARGING + self.charging_event_handler(evt) + + if self.floating_stopwatch.get_elapsed_time() >= cfg.gen_floating_time_max: + # We've been at a bulk voltage level too long, so we have to stop charging. + # Set the minimum current possible. + + if self.current_change_direction == CurrentChangeDirection.UP: + # This shouldn't happen, obviously an error. + msg = 'gen_charging_program:' + msg += ' been at bulk voltage level too long, but current change direction is still \'up\'!' + msg += ' This is obviously an error, please fix it' + logger.warning(msg) + self.error_handler(msg) + + self.gen_next_current(current=self.min_allowed_current) + + elif self.active_current is not None: + # If voltage is greater than float voltage, keep the stopwatch ticking + if v > cfg.gen_floating_v and self.floating_stopwatch.is_paused(): + try: + self.floating_stopwatch.go() + except StopwatchError: + msg = 'gen_charging_program: floating_stopwatch.go() failed at (2)' + logger.warning(msg) + self.error_handler(msg) + # Otherwise, pause it + elif v <= cfg.gen_floating_v and not self.floating_stopwatch.is_paused(): + try: + self.floating_stopwatch.pause() + except StopwatchError: + msg = 'gen_charging_program: floating_stopwatch.pause() failed at (3)' + logger.warning(msg) + self.error_handler(msg) + + # Charging current monitoring + if self.current_change_direction == CurrentChangeDirection.UP: + # Generator is warming up in this code path + + if self.next_current_enter_time != 0 and pd != BatteryPowerDirection.CHARGING: + # Generator was warming up and charging, but stopped (pd has changed). + # Resetting to the minimum possible pd + logger.info(f'gen_charging_program (warming path): was charging but power direction suddeny changed. resetting to minimum current') + self.next_current_enter_time = 0 + self.gen_next_current(current=self.min_allowed_current) + + elif self.next_current_enter_time == 0 and pd == BatteryPowerDirection.CHARGING: + self.next_current_enter_time = time.time() + cfg.gen_raise_intervals[self.active_current_idx] + logger.info(f'gen_charging_program (warming path): set next_current_enter_time to {self.next_current_enter_time}') + + elif self.next_current_enter_time != 0 and time.time() >= self.next_current_enter_time: + logger.info('gen_charging_program (warming path): hit next_current_enter_time, calling gen_next_current()') + self.gen_next_current() + else: + # Gradually lower the current level, based on how close + # battery voltage has come to the bulk level. + if self.active_current >= 30: + upper_bound = cfg.gen_cur30_v_limit + elif self.active_current == 20: + upper_bound = cfg.gen_cur20_v_limit + else: + upper_bound = cfg.gen_cur10_v_limit + + # Voltage is high enough already and it's close to bulk level; we hit the upper bound, + # so let's lower the current + if v >= upper_bound: + self.gen_next_current() + + elif self.charging_state == ChargingState.AC_DONE: + # We've already finished charging, but AC was connected. Not that it's disconnected, + # set the appropriate state and notify users. + if not ac: + self.gen_stop(ChargingState.NOT_CHARGING) + + def gen_start(self, pd: BatteryPowerDirection): + if pd == BatteryPowerDirection.CHARGING: + self.charging_state = ChargingState.AC_OK + self.charging_event_handler(ChargingEvent.AC_CHARGING_STARTED) + logger.info('AC line connected and charging, entering AC_OK state') + + # Continue the stopwatch, if needed + try: + self.floating_stopwatch.go() + except StopwatchError: + msg = 'floating_stopwatch.go() failed at ac_charging_start(), AC_OK path' + logger.warning(msg) + self.error_handler(msg) + else: + self.charging_state = ChargingState.AC_WAITING + self.charging_event_handler(ChargingEvent.AC_NOT_CHARGING) + logger.info('AC line connected but not charging yet, entering AC_WAITING state') + + # Pause the stopwatch, if needed + try: + if not self.floating_stopwatch.is_paused(): + self.floating_stopwatch.pause() + except StopwatchError: + msg = 'floating_stopwatch.pause() failed at ac_charging_start(), AC_WAITING path' + logger.warning(msg) + self.error_handler(msg) + + # idx == -1 means haven't started our program yet. + if self.active_current_idx == -1: + self.gen_next_current() + # self.set_hw_charging_current(self.min_allowed_current) + + def gen_stop(self, reason: ChargingState): + self.charging_state = reason + + if reason == ChargingState.AC_DONE: + event = ChargingEvent.AC_CHARGING_FINISHED + elif reason == ChargingState.NOT_CHARGING: + event = ChargingEvent.AC_DISCONNECTED + else: + raise ValueError(f'ac_charging_stop: unexpected reason {reason}') + + logger.info(f'charging is finished, entering {reason} state') + self.charging_event_handler(event) + + # Let Mr. Proper do his job + if self.active_current_idx != -1: + self.next_current_enter_time = 0 + self.mostly_charged = False + self.active_current_idx = -1 + self.floating_stopwatch.reset() + + def gen_next_current(self, current=None): + if current is None: + try: + current = self._next_current() + logger.debug(f'gen_next_current: ready to change charging current to {current} A') + except IndexError: + logger.debug('gen_next_current: was going to change charging current, but no currents left; finishing charging program') + self.gen_stop(ChargingState.AC_DONE) + return + + else: + try: + idx = self.currents.index(current) + except ValueError: + msg = f'gen_next_current: got current={current} but it\'s not in the currents list' + logger.error(msg) + self.error_handler(msg) + return + self.active_current_idx = idx + + if self.current_change_direction == CurrentChangeDirection.DOWN: + if current == self.currents[0]: + self.mostly_charged = True + self.gen_stop(ChargingState.AC_DONE) + + elif current == self.currents[1] and not self.mostly_charged: + self.mostly_charged = True + self.charging_event_handler(ChargingEvent.AC_MOSTLY_CHARGED) + + self.set_hw_charging_current(current) + + def set_hw_charging_current(self, current: int): + try: + response = inverter.exec('set-max-ac-charging-current', (0, current)) + if response['result'] != 'ok': + logger.error(f'failed to change AC charging current to {current} A') + raise InverterError('set-max-ac-charging-current: inverterd reported error') + else: + self.charging_event_handler(ChargingEvent.AC_CURRENT_CHANGED, current=current) + logger.info(f'changed AC charging current to {current} A') + except InverterError as e: + self.error_handler(f'failed to set charging current to {current} A (caught InverterError)') + logger.exception(e) + + def _next_current(self): + if self.current_change_direction == CurrentChangeDirection.UP: + self.active_current_idx += 1 + if self.active_current_idx == len(self.currents)-1: + logger.info('_next_current: charging current power direction to DOWN') + self.current_change_direction = CurrentChangeDirection.DOWN + self.next_current_enter_time = 0 + else: + if self.active_current_idx == 0: + raise IndexError('can\'t go lower') + self.active_current_idx -= 1 + + logger.info(f'_next_current: active_current_idx set to {self.active_current_idx}, returning current of {self.currents[self.active_current_idx]} A') + return self.currents[self.active_current_idx] + + def low_voltage_program(self, v: float, load_watts: int): + crit_level = cfg.vcrit + low_level = cfg.vlow + + if v <= crit_level: + state = BatteryState.CRITICAL + elif v <= low_level: + state = BatteryState.LOW + else: + state = BatteryState.NORMAL + + if state != self.battery_state: + self.battery_state = state + self.battery_event_handler(state, v, load_watts) + + def set_charging_event_handler(self, handler: Callable): + self.charging_event_handler = handler + + def set_battery_event_handler(self, handler: Callable): + self.battery_event_handler = handler + + def set_error_handler(self, handler: Callable): + self.error_handler = handler + + def stop(self): + self.interrupted = True + + def dump_status(self) -> dict: + return { + 'interrupted': self.interrupted, + 'currents': self.currents, + 'active_current': self.active_current, + 'current_change_direction': self.current_change_direction.name, + 'battery_state': self.battery_state.name, + 'charging_state': self.charging_state.name, + 'mostly_charged': self.mostly_charged, + 'floating_stopwatch_paused': self.floating_stopwatch.is_paused(), + 'floating_stopwatch_elapsed': self.floating_stopwatch.get_elapsed_time(), + 'time_now': time.time(), + 'next_current_enter_time': self.next_current_enter_time, + } |