考虑供电半径延长的配电网用电力电子调压器控制策略
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1.浙江省电机系统智能控制与变流技术重点实验室(浙江大学电气工程学院);2.国网青海省电力公司;3.国网青海省电力公司果洛供电公司

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TM726?

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国网青海省电力公司科技项目(5228201900G5)


A control strategy of power electronic voltage regulator for distribution network with extended supply radius considered
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Affiliation:

1.College of Electrical Engineering Zhejiang University;2.State Grid Qinghai Electric Power Company;3.ZheJiang University;4.Guoluo Power Supply Company

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    摘要:

    针对稀疏地区中低压配电网由于供电半径延长导致的线路末端电能质量问题,提出基于电力电子调压器的直接电压控制策略,该策略结合延时信号消除的锁相环同步方式和比例积分谐振器,能够迅速改善线路末端低电压以及三相不平衡的电能质量问题,实现线路电压的动态连续补偿。在此基础上,进一步推导并验证了电力电子调压器装置容量与供电半径的数学关系式,为该装置在工程上的配置提供理论依据。最后,结合稀疏地区配电网实际运行场景,在MATLAB/Simulink中搭建了电压等级为10kV的电力电子调压器仿真模型,仿真结果证明了本文所提电力电子调压器直接电压控制策略的有效性以及装置容量与供电半径间的数学关系式的准确性。

    Abstract:

    The power quality of the middle and low voltage distribution network will deteriorate due to the extension of power supply radius in the sparse areas. To deal with this problem, a direct voltage control strategy based on power electronic voltage regulator is proposed in this paper. The phase-locked loop of delayed signal cancellation and proportional-integral-resonant regulator are employed in this control strategy. And this control strategy quickly improves the power quality for the low and imbalanced voltage at the end of the line, which can dynamically and continuously compensate the line voltage. On this basis, this paper further deduces and verifies the mathematical relationship between the capacity of power electronic voltage regulator and the power supply radius, which provides a theoretical basis for the configuration of device in engineering. Finally, combined with the actual operation condition in the sparse area, a 10-kV power electronic voltage regulator model is developed in MATLAB/Simulink. The results demonstrate the effectiveness of the proposed direct voltage control strategy and the accuracy of the mathematical relationship between the device capacity and the power supply radius.

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  • 收稿日期:2020-12-17
  • 最后修改日期:2021-01-18
  • 录用日期:2021-07-26
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