Most traditional Var compensation-based voltage regulation methods are developed following the single-phase Volt-Var response rule. These methods typically have competent voltage regulation performance with balanced photovoltaic (PV) integration. However, certain randomness of single-phase rooftop PV installation may lead to significant PV power imbalance across three phases, especially in low voltage (LV) distribution systems. In such unbalanced situations, unintended inter-phase Volt-Var response which is ignored in the single-phase Volt-Var response rule will become significant and greatly challenge the effectiveness of the traditional methods on voltage regulation. This can further cause inverter saturation and consequently makes distribution systems vulnerable to overvoltage problems. In this paper, the mathematical equations of unbalanced three-phase Volt-Var response are first derived and analyzed to identify the strong MVE (mutual Var compensation effect) and the weak MVE. This analysis provides the theoretical foundation for the development of the proposed inter-phase coordinated consensus algorithm, which can successfully overcome PV imbalance-induced voltage regulation challenges (e.g., inverter saturation and network overvoltage), while does not need exact system parameters. The effectiveness of this method has been validated by time-series simulations with a real LV distribution system and recorded data.

中文翻译：

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低压系统中不平衡光伏集成电压控制的分布式相间协调算法


大多数传统的基于无功补偿的电压调节方法是遵循单相伏特-无功响应规则开发的。这些方法通常具有良好的电压调节性能和平衡光伏 (PV) 集成。然而，单相屋顶光伏安装的某些随机性可能会导致三相之间出现严重的光伏功率不平衡，特别是在低压（LV）配电系统中。在这种不平衡情况下，单相Volt-Var响应规则中被忽略的非预期相间Volt-Var响应将变得显着，并对传统电压调节方法的有效性提出极大挑战。这可能进一步导致逆变器饱和，从而使配电系统容易出现过压问题。本文首先推导并分析了不平衡三相Volt-Var响应的数学方程，以识别强MVE（互Var补偿效应）和弱MVE。该分析为所提出的相间协调共识算法的开发提供了理论基础，该算法可以成功克服光伏不平衡引起的电压调节挑战（例如逆变器饱和和网络过压），同时不需要精确的系统参数。该方法的有效性已通过真实低压配电系统的时间序列模拟和记录数据得到验证。