| 引用本文: | 王鹏,李明明,肖华锋.非隔离并网逆变器进网电流直流分量抑制策略参数优化设计[J].电力自动化设备,2022,42(1): |
| WANG Peng,LI Mingming,XIAO Huafeng.Parameter optimization design on suppression strategy for DC components of grid-in current in transformerless grid-connected inverter[J].Electric Power Automation Equipment,2022,42(1): |
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| 摘要: |
| 非隔离并网逆变器存在向电网注入直流电流的风险。而现有针对该问题的虚拟电容法的控制器参数选择未兼顾进网电流控制器的稳态和动态性能。为此，提出一种比例谐振和虚拟电容(PR+C)控制器参数优化方法。首先，通过控制系统传递函数分析了虚拟电容和PR控制器之间的相互影响，并由幅值和相位裕度约束系统稳定性，初步给出参数选择范围。其次，定义了表征基波电流跟踪性能和直流抑制效果的3个指标，通过客观赋权法得到目标函数后在选择范围内进行优化参数求解。最后，通过样机实验对比不同控制参数下的控制性能，验证了优化参数的有效性。最终结果表明，所提参数优化过程简单明了，能够客观地权衡直流分量抑制效果和进网电流跟踪能力。 |
| 关键词: 非隔离并网逆变器 直流分量 虚拟电容 参数优化 |
| DOI：10.16081/j.epae.202108003 |
| 分类号:TM464 |
| 基金项目:江苏省自然科学基金资助项目(BK20171360)；江苏省智能电网技术与装备重点实验室课题项目 |
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| Parameter optimization design on suppression strategy for DC components of grid-in current in transformerless grid-connected inverter |
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WANG Peng1, LI Mingming1, XIAO Huafeng1,2
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1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.Jiangsu Key Laboratory of Smart Grid Technology and Equipment, Nanjing 210096, China
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| Abstract: |
| The transformerless grid-connected inverters have the risk of injecting DC current into the grid. However, the existing virtual capacitor method for this problem does not take into account the steady state and dynamic performance of the grid-in current controller in its controller parameter selection. For this reason, a PR+C(Proportional Resonant and virtual Capacitor) controller parameter optimization method is proposed. Firstly, the interaction between the virtual capacitor and the PR controller is analyzed through the transfer function of the control system. The system stability is constrained by the amplitude and phase margin, and the parameter selection range is initially given. Secondly, three indicators that characterize the fundamental current tracking performance and DC component suppression effect are defined. After obtaining the objective function through the objective weighting method, the optimized parameters are solved in the selected range. Finally, the prototype experiment is used to compare the control performance under different control parameters to verify the effectiveness of the optimized parameters. The results show that the proposed parameter optimization process is simple and clear, and can objectively weigh the DC component suppression effect and the grid-in current tracking ability. |
| Key words: transformerless grid-connected inverter DC components virtual capacitor parameter optimization |
