This paper examines the impact of different voltage unbalance definitions on voltage control in unbalanced distribution systems. Traditional voltage regulation methods for unbalanced systems rely on a single voltage unbalance definition with inconsistent adoptions. In such a situation, voltage control performance can vary between definitions, and improper choice leads to control failures. In this study, we perform numerical analysis and simulations to investigate the impact of different definitions. In the numerical analysis, two definitions quantifying negative and zero sequence components are used as reference definitions, and the theoretical error range of the remaining definitions is identified. The results are further verified by the simulations on the IEEE 123 node test system with phase-by-phase controlled three-phase step voltage regulators and smart photovoltaic inverters. The control of the devices is optimized to minimize or limit a specific definition. The results show that the values of each definition at the same voltage condition can differ significantly, and inappropriate definitions may lead to significant uncertainty in the voltage control. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

中文翻译：

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光伏渗透配电系统电压控制电压不平衡定义的评估

本文研究了不同电压不平衡定义对不平衡配电系统电压控制的影响。不平衡系统的传统电压调节方法依赖于单一电压不平衡定义，且采用不一致。在这种情况下，电压控制性能可能因定义而异，并且选择不当会导致控制失败。在本研究中，我们进行数值分析和模拟来研究不同定义的影响。在数值分析中，使用量化负序分量和零序分量的两个定义作为参考定义，并确定了其余定义的理论误差范围。通过在具有逐相控制的三相步进电压调节器和智能光伏逆变器的IEEE 123节点测试系统上的仿真，进一步验证了结果。设备的控制被优化以最小化或限制特定的定义。结果表明，相同电压条件下各定义的值可能存在显着差异，不恰当的定义可能会导致电压控制的显着不确定性。 © 2024 日本电气工程师协会和 Wiley periodicals LLC。