光储联合发电系统建模及并网控制

大型光伏系统并网具有随机性强、波动幅度大以及电能质量不稳定等问题。建立了光储联合并网发电系统动态模型，提出了改善暂态电压稳定性和平抑功率波动联合发电控制策略。光伏单元采用了基于功率变化率最大功率控制算法及其定有功、无功双环解耦控制策略；储能单元利用电压和频率的设定值同测量值比较，从而得到功率控制参考值，通过对功率以及电流环的解耦控制实现同步并网。仿真验证了模型及其协调控制策略的有效性。

Research on System Modeling and Grid Connection Characteristics of Large-scale PV-ES Hybrid Power System

This paper presents a dynamic model and a coordinated control strategy for photo voltaic and energy storage hybrid power system. The proposed control strategy is able to effectively improve transient voltage stability and suppress power fluctuation of large scale grid-connected photo voltaic system. The maximum power control algorithm based on maximum power change rate is adopted in photo voltaic system along with decoupled power control method, while the power control reference is obtained from the error between real values and settings of voltage and frequency in energy storage system. The system synchronization is realized by decoupling control of power and current loop. The simulation result shows the validity of proposed model and control strategy, which consequently improve system low voltage ride-through ability and power grid stability.