With the growing distributed PV installation rate in distribution systems, voltage regulation difficulties such as local voltage violations and fluctuations have become common. To solve the voltage regulation problems, the local voltage regulation method using volt‐var (VV) function is effective for its high regulation speed, high accuracy, and flexibility. However, there are still hurdles on real application, such as parameter setting difficulties, insufficient voltage fluctuation mitigation effect, and unfairness of reactive power generation between PV customers. To further improve the VV function, this paper proposes a PID closed‐loop based VV function and mode‐switching function of PV smart inverter (SI). To validate the proposed methods, numerical simulations were conducted using a 6‐feeder distribution system model based on the JST‐CREST 126 distribution feeder model. According to the simulation result, the proposed method can better mitigate the local voltage violation compared to basic VV function based on the VV curve, also improve the fairness between PV customers, while the total reactive power generation and tap operations increases for the aim of more adequate voltage regulation. © 2024 The Authors. IEEJ Transactions on Electrical and Electronic Engineering published by Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

中文翻译：

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一种利用光伏智能逆变器改进的Volt-Var函数的分散电压调节方案

随着分布式光伏发电在配电系统中的安装率不断提高，局部电压违规、波动等电压调节困难的现象也越来越普遍。为了解决电压调节问题，使用伏特-无功（VV）函数的本地电压调节方法因其调节速度快、精度高、灵活性强而有效。但实际应用仍存在参数设置困难、电压波动缓解效果不足、光伏客户之间无功发电量不公平等障碍。为了进一步完善VV功能，本文提出了一种基于PID闭环VV功能和模式切换功能的光伏智能逆变器（SI）。为了验证所提出的方法，使用基于 JST-CREST 126 配电馈线模型的 6 馈线配电系统模型进行了数值模拟。根据仿真结果，与基于VV曲线的基本VV函数相比，该方法可以更好地缓解本地电压违规，也提高了光伏客户之间的公平性，同时总无功发电和分接操作增加，以达到更多目的。足够的电压调节。 © 2024 作者。IEEJ 电气与电子工程汇刊由日本电气工程师协会和 Wiley Journals LLC 出版。