| 引用本文: | 郑峰,林祥群,邓长虹,郑传良,杨威,曾麟钧.计及降阶混合控制算法多逆变器并联系统谐振抑制策略[J].电力自动化设备,2021,41(4): |
| ZHENG Feng,LIN Xiangqun,DENG Changhong,ZHENG Chuanliang,YANG Wei,ZENG Linjun.Resonance suppression strategy of multi-inverter parallel system considering hybrid control algorithm for order reduction[J].Electric Power Automation Equipment,2021,41(4): |
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| 摘要: |
| 针对LCL型多逆变器并联系统的3类谐振问题，提出了一种降阶新型混合控制算法的谐振抑制策略。该谐振抑制策略基于逆变器分层控制结构，将电流预测模型控制与二自由度控制原理相融合。其中，电流内环控制层采用电流预测模型控制消除其PI控制器及PWM调节器，实现电流内环传递函数单位化；电压外环控制层利用二自由度控制原理，构建被控对象逆模型，实现电压外环传递函数单位化。控制层内、外环的传递函数单位化使谐振传递函数分子、分母间最高阶差降低，从而使得谐振传递函数的伯德图中无谐振尖峰。最后，基于MATLAB/Simulink平台进行仿真验证，结果表明面对不同的谐波源，所提策略均能够保证并网电流的总谐波畸变率小于4 %，可有效抑制多逆变器并联系统的谐振。 |
| 关键词: 多逆变器并联系统 谐振 电流预测模型控制 降阶 二自由度控制 |
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| 基金项目:国家重点研发计划项目(2017YFB0903705)；福建省自然科学基金资助项目(2019J01249) |
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| Resonance suppression strategy of multi-inverter parallel system considering hybrid control algorithm for order reduction |
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ZHENG Feng1, LIN Xiangqun1, DENG Changhong2, ZHENG Chuanliang1, YANG Wei2, ZENG Linjun3
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1.School of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350116, China;2.School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China;3.Shiyan Power Supply Company of State Grid Hubei Electric Power Co.,Ltd.,Shiyan 442000, China
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| Abstract: |
| In order to suppress three kinds of resonance for LCL type multi-inverter parallel system, a new hybrid control algorithm for order reduction is proposed. The resonance suppression strategy is based on the hierarchical control structure of inverter, and combines the current prediction model control with the two-degree-of-freedom control principle. The current inner-loop control layer adopts current prediction model control to eliminate its PI controller and PWM regulator, and realize the unitization of the current inner-loop transfer function. The voltage outer-loop control layer adopts the principle of two-degree-of-freedom control to construct the inverse model of the controlled object, and realize the unitization of the voltage outer-loop transfer function. Due to the unitization of the inner-and outer-loop transfer function of control layer, the highest order difference between the numerator and the denominator of resonance transfer function is decreased, so that there is no resonance peak value in the Bode diagram of the resonance transfer function. Finally, the simulative results based on MATLAB/Simulink indicate that when facing different harmonic sources, the proposed strategies can ensure that the total harmonic distortion rate of grid-connected current is less than 4 %,which can effectively suppress the resonance of multi-inverter parallel system. |
| Key words: multi-inverter parallel system resonance current prediction model control order reduction two-degree-of-freedom control |
