风力发电系统网侧逆变器双闭环控制策略研究

针对风力发电系统经过并网逆变器与外部电网连接时,系统向电网输送的电能必须满足电网的电压和频率要求。在分析系统变流器的数学模型基础上,对网侧逆变器提出了一种基于无功电压调节的电压电流双闭环控制策略,通过调节无功实现系统母线电压幅值稳定,也实现了系统有功无功解耦控制,且输出电流谐波含量少,使系统向电网输送稳定、恒频率的电能。经过仿真分析,在负载变化情况下系统可实现稳定控制及具有良好的电流鲁棒性,有效验证该控制策略的可行性和准确性,对风力发电并网技术研究具有一定的实用价值。

Study on Double Closed-Loop Control Strategy of the Side Grid Inverter for Wind Power Generation System

For wind power system with external power grid connection, the grid inverter system to grid electricity must satisfy the requirement of the grid voltage and frequency. In analysis system based on the mathematical model of current transformer, this paper puts forward a network side inverter based on reactive voltage regulating voltage and current double closed-loop control strategy, through adjusting reactive power system bus voltage amplitude stability, also has realized the active reactive power decoupling control system, and low output current harmonic content, enables the system to the grid stable and constant frequency power. Through the simulation analysis, under the condition of load change system can realize stable control and has good current robustness, verify the feasibility of the control strategy effectively and accuracy, research on wind power grid technology has a certain practical value.