Research On STATCOM/BESS Control Strategy Of Photovoltaic Microgrid

With the rapid development of modern science and technology,the demand for renewable fuels and non-renewable fuels has increased rapidly,and environmental pollution problems have become increasingly serious.Photovoltaic power generation,wind power generation,hydropower generation and other new energy distributed power generation stand out.Among them,photovoltaic power generation is most favored for its large availability,low price and environmental friendliness.However,due to the randomness and volatility of photovoltaic power generation,it is easy to cause impact on the large power grid during its grid connection process,causing fluctuations in grid frequency and voltage,which affects the safe operation of the system.Therefore,the flexible AC power transmission device STATCOM with battery BESS is used to compensate for the problems of new energy in the grid connection process,so as to reduce the power loss of the entire power grid and improve the stability and reliability of the power grid.Firstly,the paper starts with the working principle of STATCOM/BESS device,and establishes its mathematical model in the coordinate system and two coordinate systems.Then it analyzes the classic DPC control strategy of STATCOM/BESS device,and uses the inductive load and capacitive load pair respectively.It has been simulated and verified that the STATCOM/BESS device has certain reactive power compensation ability under different working conditions.Secondly,for the problem that the classic DPC has weak reactive power control effect,the DPC switch table is redesigned and planned.Simulations in MARLAB verify the feasibility of the improvement.Finally,in the case of the classic DPC application in STATCOM/BESS,the problem of low precision of active and reactive tracking and large fluctuations in regulation is re-introduced.Side voltage expression,using Emile's interpolation method for interpolation prediction when predicting power,and combining voltage space vector technology SVPWM with predictive direct power control P-DPC,applied to STATCOM/BESS device;establishing control system structure The system model was built in MATLAB and the detailed simulation was carried out.The results verified the effectiveness of the improvement.Through the research in this paper,the classic DPC control strategy of STATCOM/BESS device is improved,and the switch table is redesigned.The voltage space vector technology is combined with the predicted direct power control strategy and applied in the STATCOM/BESS device to form SVPWM-P-DPC control system.The control system can accelerate the dynamic response speed and improves the power tracking accuracy,which is of great significance to the stability and reliability of the power system.Figure [42] Table [7] reference[60]...