针对分布式发电系统多逆变器并联的特殊结构,该文分析零序环流产生机理,建立相应等值电气模型,提出一种将神经网络PI控制和准比例-谐振控制的零序环流抑制策略。首先,改进传统PI控制器参数设计方法,引入神经网络计算PI控制器参数,解决逆变器输出的非线性问题,完成基波域的零序环流抑制;其次,针对3次谐波域的零序环流,设计准比例谐振控制器,将零序环流分量经神经网络PI控制以及准PR控制获得控制指令,进行SVPWM零序占空比调制,从而精准抑制3次环流;最后,采用大型数字化仿真软件Matlab/Simulink进行建模分析以及通过实验手段进行测试。结果表明：所提控制策略合理可行,能够有效抑制零序环流,对于大规模分布式发电工程及应用具有重要指导价值。
Abstract
Aiming at the special structure of multi-inverter parallel connection in distributed power generation systems, this paper analyzes the mechanism of zero-sequence circulation, establishes the corresponding equivalent electrical model, and proposes a zero-sequence circulation suppression strategy which combines neural network PI control and quasi-proportional-resonant control. Firstly, the traditional PI controller parameter design method is improved, and the neural network is introduced to calculate the PI controller parameters, so as to solve the nonlinear problem of inverter output and complete the zero-sequence circulation suppression in the fundamental wave domain. Secondly, a quasi-proportional resonance controller is designed for the zero-sequence circulation in the third harmonic domain, and the zero-sequence circulation component is controlled by neural network PI control and quasi-PR control to obtain control instructions, and SVPWM zero-sequence duty ratio modulation is carried out, so as to accurately suppress the third-harmonic circulation; Finally, the large-scale simulation software Matlab/Simulink is used for modeling analysis and testing by experimental means. The results show that the proposed control strategy is reasonable and feasible, which can effectively suppress zero-sequence circulation, and has important guidance value for large-scale distributed power generation engineering and application.
关键词
电力逆变器 /
脉宽调制 /
神经网络 /
零序环流 /
准比例谐振控制
Key words
electric inverters /
PWM /
neural network /
zero sequence circulation /
quasi-proportional-resonance control
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基金
国家自然科学基金（62063026）; 内蒙古自治区重点研发与成果转化项目（2022YFHH0019）; 内蒙古自治区科技攻关项目（2020GG0159）; 内蒙古自治区科技重大专项（2020ZD0017）
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