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Coordination of transformer on-load tap changer and PV smart inverters for voltage control of distribution feeders

机译:变压器有载分接开关和PV智能逆变器的配合,用于配电馈线的电压控制

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The increasing penetration of photovoltaic (PV) generation in distribution systems has entailed dramatic deterioration of distribution system voltage quality due to power injection by PV systems. This paper presents a coordinating control strategy of on-load tap changer (OLTC) of the main transformer in a substation and PV smart inverters to maintain good service voltage quality for the distribution network with high penetration of PV systems. The voltage level at the end-point of each distribution feeder and the power generation by each PV system are collected via a renewable management system. The hourly tap position of OLTC is then derived based on the daily profiles of feeder voltage variation and the injected power generated by all PV systems along the feeder. The PV smart inverters execute an autonomous control of reactive power compensation so that the voltage at the point of common coupling (PCC) can be fixed at the specified voltage level. A main transformer, which serves six feeders with high PV penetration in Taiwan Power Company (Taipower), was selected for this case study. With the proposed coordinating control of OLTC and PV smart inverters, the impact of service voltage quality due to the high penetration of PV systems in the distribution system can be effectively mitigated.
机译:光伏(PV)发电在配电系统中的渗透率不断提高,导致由于光伏系统注入的电力而导致配电系统电压质量急剧下降。提出了变电站主变压器有载分接开关(OLTC)和光伏智能逆变器的协调控制策略,以保持光伏系统的高渗透率,为配电网维持良好的服务电压质量。每个配电馈线端点的电压水平和每个光伏系统的发电量均通过可再生管理系统收集。然后,根据馈线电压变化的日曲线以及沿馈线的所有PV系统生成的注入功率得出OLTC的每小时分接头位置。 PV智能逆变器执行无功补偿的自主控制,以便可以将公共耦合点(PCC)的电压固定在指定的电压水平。本案例研究选择了一个主变压器,该变压器为台湾电力公司(Taipower)的六个馈线具有较高的PV穿透能力。通过提出的OLTC和PV智能逆变器的协调控制,可以有效地减轻由于PV系统在配电系统中的高渗透率而引起的服务电压质量的影响。

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