Research On The Control Strategies Of Battery Energy Storage System For Wind Power Plant

Energy crisis proposed an ordeal to human being development. Wind energy is a kind of renewable energy without mining, friendly to the environment, and is a mature technology. These makes wind power has the most large-scale development and market-oriented conditions of non-hydro renewable energy at this stage. China is the fastest growing country of wind power in the world, to develop wind power is an effective way to solve China’s energy problem.As wind power has the inherent randomness and intermittent, there are a lot of unexpected fluctuations in the wind turbine output, which greatly reduces the reliability of the wind farm. Large and medium-sized wind farms generally directly connected to the grid, whose power fluctuations will have a significant impact on grid frequency and stability, which is a key factor in restricting wind energy utilization. Introduction of large-scale energy storage device in wind power system can effectively reduce the impact and influence caused by wind power, improve the consistency of the wind power output and wind power prediction, safeguard the credibility of wind power supply, and improve power system acceptance capacity of wind power.This paper first introduces the modeling of the wind-storage combined system, which runs on the RTDS as hardware in the loop simulation. Simulation waveforms and data analysis shows the model and controller has relatively good accuracy. The system provides a basis for further study of the wind-storage control method.In wind farm energy and storage configuration part, use Particle Swarm Optimization to calculate the inverter power and battery capacity of the energy storage system. The calculation is based on the actual data of a 49.5MW wind farm, using particle swarm optimization algorithm to optimize the power and capacity of the wind farm storage under varying objectives, considering the power stability and the storage costs, and simulating on the optimized wind farm. The results show that the algorithm is able to determine a set of upper and lower bounds of appropriate energy storage power and capacity.Make research on energy storage system based on digital filter method to stabilize wind power. Improved first order filtering algorithm, consider the battery SOC parameters, ensure the system meeting the wind farm connected to grid standards with a relatively small capacity and power, and ensuring the battery energy controlled in a security range at the same time. Discuss the possibility of second order filter algorithms to improve wind power stabilize, compared to the first-order filtering with a same time constant. The full text provides some basis for of the energy storage system working with wind power.