Frequency Response And Optimal Schedule Strategy Of HVAC And Energy Storage Considering Wind Power Consumption

As a large number of intermittent and distributed renewable energy sources are integrated into the power grid,it is difficult for traditional thermal power plants to maintain the power and frequency of the power system.HVAC(Heating,Ventilation and Air Conditioning,HVAC),electric vehicles(EV)and energy stor age have huge potential for peak load and frequency regulation because of high flexibility and strong controllability.To solve the power and frequency imbalance of the power system caused by large-scale wind power grid integration,HVAC and energy storage batteries are taken as the research object to participate in demand response from two aspects of frequency response and power system optimization scheduling in this paper.The main work and innovations of this paper are as follows:(1)Aiming at the collaborative scheduling problem of HVAC and energy storage,a demand response-oriented HVAC and energy storage general battery model is established.The model can characterize the flexibility of HVAC and energy storage,and combined the multi-scenario method and robust optimization to analyze the impact of the uncertainty of user power consumption on HVAC participation in demand response,and gave the robust boundary of the model.The simulation results show that the model that considers the uncertainty can more accurately describe the power characteristics of HVAC and energy storage batter y than the model that does not consider the uncertainty.It is verified that HVAC and battery energy storage can increase the flexibility of the power system,and further verified that this model can be used for demand response.(2)Aiming at the problem of insufficient quick adjustment capability of supplementary units under the background of a large number of random and intermittent renewable energy integrated into the power grid,an adaptive control strategy of energy storage and HVAC joint participation in frequency regulation is proposed based on the frequency regulation characteristics of HVAC and energy storage.Frequency deviation,rate of frequency deviation,state of charge(SOC)and user comfort are considered in the output coefficient model of HVAC and energy storage battery.The effectiveness of the control strategy is verified by simulations of step load disturbance and continuous load di sturbance,and compared with the control strategy of fixed output coefficient.The simulation results show that the control strategy in this paper can improve the frequency regulation performance,when meet the constraints of SOC and user comfort.(3)Aiming at the problems of low energy utilization efficiency of the power system,insufficient wind power absorption capacity and high dispatching cost at this stage,a dispatching scheme in which HVAC and energy storage jointly participate in the optimal scheduling of the power system is proposed.According to the conditional value-at-risk theory,the uncertainty of wind power is considered in the wind power risk cost.Considering the operation and maintenance cost of HVAC and energy storage battery,and the penalty cost of wind abandonment,day-ahead optimal schedule strategy that HVAC and energy storage batter y participate in scheduling is proposed.And the time granularity is self-adapted to reduce the difficulty of calculation.Simulation results show that the scheduling method can improve the level of wind power consumption and reduce the cost of power system scheduling under the premise of meeting the constraints of HVAC and energy storage battery.