| 引用本文: | 安小宇,张涛,李琰琰,等.电容分裂式变换器模型预测三相不平衡治理策略[J].电力系统保护与控制,2020,48(13):142-148. |
| AN Xiaoyu,ZHANG Tao,LI Yanyan,et al.Model predictive three phase unbalance controlling strategy for split capacitor converter[J].Power System Protection and Control,2020,48(13):142-148 |
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| 摘要: |
| 针对电网三相不平衡条件下三相四线制配电系统产生负序以及零序电流的问题，选择电容分裂式变换器为研究对象，提出一种模型预测电流控制策略。首先，通过坐标变换构建ab0坐标下逆变器输出电流的预测模型。其次，基于瞬时无功理论的参考补偿分量检测方法直接计算出零序参考电流。最后，利用价值函数对逆变器输出的不同电压矢量进行评估，选择使价值函数值最小的最优电压矢量并应用于下一采样周期，实现目标电流补偿。所提出的控制策略能够有效降低电网三相不平衡度，补偿三相负载不平衡产生的零序电流，提高了电网电能质量及系统运行性能。仿真与实验结果表明所提出的控制策略在电网不平衡条件下的有效性。 |
| 关键词: 电容分裂式变换器 三相不平衡 模型预测控制 电能质量治理 |
| DOI：10.19783/j.cnki.pspc.190947 |
| 分类号: |
| 基金项目:国家自然科学基金青年科学基金项目资助(51607159，51707176);河南省高等学校科技创新人才支持计划项目资助(18HASTIT025);河南省高等学校重点科研项目资助(18A470020，20A470011) |
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| Model predictive three phase unbalance controlling strategy for split capacitor converter |
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AN Xiaoyu1,ZHANG Tao1,LI Yanyan1,WANG Jun2,YONG Tao2,JIN Nan1
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(1. School of Electrical and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China;2. Sanmenxia Power Supply Company, State Grid Henan Electric Power Company, Sanmenxia 472000, China)
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| Abstract: |
| The paper aims to solve the problems of negative-sequence and zero-sequence current of the three-phase four-wire power distribution system under three phase unbalance of a power grid. A model predictive current control strategy is proposed which chooses a capacitor split converter as the research object. First, a prediction model of the inverter output current under aβ0coordinates is constructed via coordinate transformation. Secondly, the zero-sequence reference current is calculated directly using a reference compensation component detection method based on instantaneous reactive power theory. Finally, the different voltage vectors output by the inverter are evaluated by applying the value function. The optimal voltage vector which makes the value function a minimum is selected and then applied to the next sampling period to realize target current compensation. The proposed control strategy effectively reduces the three-phase unbalance of the power grid, compensates the zero-sequence current generated by three-phase load imbalance, and improves the power quality of the power grid and system operation performance. The simulation and experimental results show the effectiveness of the proposed control strategy under power grid imbalance. This work is supported by Youth Science Fund of National Natural Science Foundation of China (No. 51607159 and No. 51707176). |
| Key words: split capacitor converter three phase unbalance model predictive control power quality control |
