风电系统双PWM变换器直流母线电压控制技术

摘要

双PWM变换器是目前风力发电系统广泛使用的控制电路，其直流母线是实现风电系统能量传输与转换的中间环节，母线电压的稳定与否直接关系到能否实现对机侧和网侧变换器独立控制及整个系统的安全稳定运行，减小直流母线电压波动成为双PWM变换器控制技术的研究热点，并得到了广泛的关注。对风电系统双PWM变换器直流母线电压控制技术进行综述，分析了基于电容电流直接控制、直接功率控制、协调控制及模糊控制等各种控制策略的优缺点，指出了存在的问题、今后的研究重点及发展趋势。%Dual PWM converter control system is widely used in wind power system,the DC bus is the interme-diate link of energy transfer and conversion in wind power system,bus voltage stability is directly related to the realization of the generator side and grid side converter control and the stable operation of the whole system. How to reduce the fluctuation of DC bus voltage has become the research focus of dual PWM converter control technology,and received wide attention. DC bus voltage control technology in wind power system with dual PWM converter was summarized. Analyzed the advantages and disadvantages of the direct control based on ca-pacitive current,direct power control,coordination control,fuzzy control and other control strategies. Pointed out the problem in each of control strategies and the research emphases and development trend in the future.