random_generator_battery.py

# ------------------------------------------------------------------------
# Energy management environment for reinforcement learning agents developed by
# Hou Shengren, TU Delft, h.shengren@tudelft.nl
import random
import numpy as np
import pandas as pd 
import gym
from gym import spaces 

from Parameters import battery_parameters,dg_parameters

class Constant:
	MONTHS_LEN = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
	MAX_STEP_HOURS = 24 * 30
class DataManager():
    def __init__(self) -> None:
        self.PV_Generation=[]
        self.Prices=[]
        self.Electricity_Consumption=[]
    def add_pv_element(self,element):self.PV_Generation.append(element)
    def add_price_element(self,element):self.Prices.append(element)
    def add_electricity_element(self,element):self.Electricity_Consumption.append(element)

    # get current time data based on given month day, and day_time
    def get_pv_data(self,month,day,day_time):return self.PV_Generation[(sum(Constant.MONTHS_LEN[:month-1])+day-1)*24+day_time]
    def get_price_data(self,month,day,day_time):return self.Prices[(sum(Constant.MONTHS_LEN[:month-1])+day-1)*24+day_time]
    def get_electricity_cons_data(self,month,day,day_time):return self.Electricity_Consumption[(sum(Constant.MONTHS_LEN[:month-1])+day-1)*24+day_time]
    # get series data for one episode
    def get_series_pv_data(self,month,day): return self.PV_Generation[(sum(Constant.MONTHS_LEN[:month-1])+day-1)*24:(sum(Constant.MONTHS_LEN[:month-1])+day-1)*24+24]
    def get_series_price_data(self,month,day):return self.Prices[(sum(Constant.MONTHS_LEN[:month-1])+day-1)*24:(sum(Constant.MONTHS_LEN[:month-1])+day-1)*24+24]
    def get_series_electricity_cons_data(self,month,day):return self.Electricity_Consumption[(sum(Constant.MONTHS_LEN[:month-1])+day-1)*24:(sum(Constant.MONTHS_LEN[:month-1])+day-1)*24+24]

class DG():
    '''simulate a simple diesel generator here'''
    def __init__(self,parameters):
        self.name=parameters.keys()
        self.a_factor=parameters['a']
        self.b_factor=parameters['b']
        self.c_factor=parameters['c']
        self.power_output_max=parameters['power_output_max']
        self.power_output_min=parameters['power_output_min']
        self.ramping_up=parameters['ramping_up']
        self.ramping_down=parameters['ramping_down']
        self.last_step_output=None 
    def step(self,action_gen):
        output_change=action_gen*self.ramping_up# constrain the output_change with ramping up boundary
        output=self.current_output+output_change
        if output>0:
            output=max(self.power_output_min,min(self.power_output_max,output))# meet the constrain 
        else:
            output=0
        self.current_output=output
    def _get_cost(self,output):
        if output<=0:
            cost=0
        else:
            cost=(self.a_factor*pow(output,2)+self.b_factor*output+self.c_factor)
        return cost 
    def reset(self):
        self.current_output=0

class Battery():
    '''simulate a simple battery here'''
    def __init__(self,parameters):
        self.capacity=parameters['capacity']
        self.max_soc=parameters['max_soc']
        self.initial_capacity=parameters['initial_capacity']
        self.min_soc=parameters['min_soc']# 0.2
        self.degradation=parameters['degradation']# degradation cost 1.2
        self.max_charge=parameters['max_charge']# nax charge ability
        self.max_discharge=parameters['max_discharge']
        self.efficiency=parameters['efficiency']
    def step(self,action_battery):
        energy=action_battery*self.max_charge
        updated_capacity=max(self.min_soc,min(self.max_soc,(self.current_capacity*self.capacity+energy)/self.capacity))
        self.energy_change=(updated_capacity-self.current_capacity)*self.capacity# if charge, positive, if discharge, negative
        self.current_capacity=updated_capacity# update capacity to current codition
    def _get_cost(self,energy):# calculate the cost depends on the energy change
        cost=energy**2*self.degradation
        return cost  
    def SOC(self):
        return self.current_capacity
    def reset(self):
        self.current_capacity=np.random.uniform(0.2,0.8)
class Grid():
    def __init__(self):
        
        self.on=True
        if self.on:
            self.exchange_ability=100
        else:
            self.exchange_ability=0
    def _get_cost(self,current_price,energy_exchange):
        return current_price*energy_exchange
    def retrive_past_price(self):
        result=[]
        if self.day<1:
            past_price=self.past_price#
        else:
            past_price=self.price[24*(self.day-1):24*self.day]
            # print(past_price)
        for item in past_price[(self.time-24)::]:
            result.append(item)
        for item in self.price[24*self.day:(24*self.day+self.time)]:
            result.append(item)
        return result 
class ESSEnv(gym.Env):
    def __init__(self,**kwargs):
        super(ESSEnv,self).__init__()
        #parameters 
        self.data_manager=DataManager()
        self._load_year_data()
        self.episode_length=kwargs.get('episode_length',24)
        self.month=None
        self.day=None
        self.TRAIN=True
        self.current_time=None
        self.battery_parameters=kwargs.get('battery_parameters',battery_parameters)
        self.dg_parameters=kwargs.get('dg_parameters',dg_parameters)
        self.penalty_coefficient=50#control soft penalty constrain 
        self.sell_coefficient=0.5# control sell benefits

        self.grid=Grid()
        self.battery=Battery(self.battery_parameters)
        self.dg1=DG(self.dg_parameters['gen_1'])
        self.dg2=DG(self.dg_parameters['gen_2'])
        self.dg3=DG(self.dg_parameters['gen_3'])

        self.action_space=spaces.Box(low=-1,high=1,shape=(4,),dtype=np.float32)

        self.state_space=spaces.Box(low=0,high=1,shape=(7,),dtype=np.float32)

    @property
    def netload(self):

        return self.demand-self.grid.wp_gen-self.grid.pv_gen
        
    def reset(self,):
        self.month=np.random.randint(1,13)# here we choose 12 month
        if self.TRAIN:
            self.day=np.random.randint(1,20)
        else:
            self.day=np.random.randint(20,Constant.MONTHS_LEN[self.month]-1)
        self.current_time=0
        self.battery.reset()
        self.dg1.reset()
        self.dg2.reset()
        self.dg3.reset()
        return self._build_state()
    def _build_state(self):
        soc=self.battery.SOC()
        dg1_output=self.dg1.current_output
        dg2_output=self.dg2.current_output
        dg3_output=self.dg3.current_output
        time_step=self.current_time
        electricity_demand=self.data_manager.get_electricity_cons_data(self.month,self.day,self.current_time)
        pv_generation=self.data_manager.get_pv_data(self.month,self.day,self.current_time)
        price=self.data_manager.get_price_data(self.month,self.day,self.current_time)
        net_load=electricity_demand-pv_generation
        obs=np.concatenate((np.float32(time_step),np.float32(price),np.float32(soc),np.float32(net_load),np.float32(dg1_output),np.float32(dg2_output),np.float32(dg3_output)),axis=None)
        return obs

    def step(self,action):# state transition here current_obs--take_action--get reward-- get_finish--next_obs
        ## here we want to put take action into each components
        current_obs=self._build_state()
        self.battery.step(action[0])# here execute the state-transition part, battery.current_capacity also changed
        self.dg1.step(action[1])
        self.dg2.step(action[2])
        self.dg3.step(action[3])
        current_output=np.array((self.dg1.current_output,self.dg2.current_output,self.dg3.current_output,-self.battery.energy_change))#truely corresonding to the result
        self.current_output=current_output
        actual_production=sum(current_output)        
        netload=current_obs[3]
        price=current_obs[1]

        unbalance=actual_production-netload

        reward=0
        excess_penalty=0
        deficient_penalty=0
        sell_benefit=0
        buy_cost=0
        self.excess=0
        self.shedding=0
        if unbalance>=0:# it is now in excess condition
            if unbalance<=self.grid.exchange_ability:
                sell_benefit=self.grid._get_cost(price,unbalance)*self.sell_coefficient #sell money to grid is little [0.029,0.1]
            else:
                sell_benefit=self.grid._get_cost(price,self.grid.exchange_ability)*self.sell_coefficient
                #real unbalance that even grid could not meet 
                self.excess=unbalance-self.grid.exchange_ability
                excess_penalty=self.excess*self.penalty_coefficient
        else:# unbalance <0, its load shedding model, in this case, deficient penalty is used 
            if abs(unbalance)<=self.grid.exchange_ability:
                buy_cost=self.grid._get_cost(price,abs(unbalance))
            else:
                buy_cost=self.grid._get_cost(price,self.grid.exchange_ability)
                self.shedding=abs(unbalance)-self.grid.exchange_ability
                deficient_penalty=self.shedding*self.penalty_coefficient
        battery_cost=self.battery._get_cost(self.battery.energy_change)# we set it as 0 this time 
        dg1_cost=self.dg1._get_cost(self.dg1.current_output)
        dg2_cost=self.dg2._get_cost(self.dg2.current_output)
        dg3_cost=self.dg3._get_cost(self.dg3.current_output)

        reward-=(battery_cost+dg1_cost+dg2_cost+dg3_cost+excess_penalty+
        deficient_penalty-sell_benefit+buy_cost)/1e3
        self.operation_cost=battery_cost+dg1_cost+dg2_cost+dg3_cost+buy_cost-sell_benefit+excess_penalty+deficient_penalty
        self.unbalance=unbalance
        self.real_unbalance=self.shedding+self.excess
        final_step_outputs=[self.dg1.current_output,self.dg2.current_output,self.dg3.current_output,self.battery.current_capacity]
        self.current_time+=1
        finish=(self.current_time==self.episode_length)
        if finish:
            self.final_step_outputs=final_step_outputs
            self.current_time=0
            # self.day+=1
            # if self.day>Constant.MONTHS_LEN[self.month-1]:
            #     self.day=1
            #     self.month+=1
            # if self.month>12:
            #     self.month=1
            #     self.day=1
            next_obs=self.reset()
            
        else:
            next_obs=self._build_state()
        return current_obs,next_obs,float(reward),finish
    def render(self, current_obs, next_obs, reward, finish):
        print('day={},hour={:2d}, state={}, next_state={}, reward={:.4f}, terminal={}\n'.format(self.day,self.current_time, current_obs, next_obs, reward, finish))
    def _load_year_data(self):
        pv_df=pd.read_csv('data/PV.csv',sep=';')
        #hourly price data for a year 
        price_df=pd.read_csv('data/Prices.csv',sep=';')
        # mins electricity consumption data for a year 
        electricity_df=pd.read_csv('data/H4.csv',sep=';')
        pv_data=pv_df['P_PV_'].apply(lambda x: x.replace(',','.')).to_numpy(dtype=float)
        price=price_df['Price'].apply(lambda x:x.replace(',','.')).to_numpy(dtype=float)
        electricity=electricity_df['Power'].apply(lambda x:x.replace(',','.')).to_numpy(dtype=float)
        # netload=electricity-pv_data
        '''we carefully redesign the magnitude for price and amount of generation as well as demand'''
        for element in pv_data:
            self.data_manager.add_pv_element(element*200)
        for element in price:
            element/=10
            if element<=0.5:
                element=0.5
            self.data_manager.add_price_element(element)
        for i in range(0,electricity.shape[0],60):
            element=electricity[i:i+60]
            self.data_manager.add_electricity_element(sum(element)*300)
if __name__ == '__main__':
    env=ESSEnv()
    env.TRAIN=False
    rewards=[]

    current_obs=env.reset()
    tem_action=[0.1,0.1,0.1,0.1]
    for _ in range (144):
        print(f'current month is {env.month}, current day is {env.day}, current time is {env.current_time}')
        current_obs,next_obs,reward,finish=env.step(tem_action)
        env.render(current_obs,next_obs,reward,finish)
        current_obs=next_obs
        rewards.append(reward)