Hybrid Timescale Voltage/Var Control in Distribution Network Considering PV Power Uncertainty
Huang Dawei, Wang Xiaoquan, Yu Na, Chen Houhe
Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China
Abstract：A hybrid time-scale voltage/var control method combining day-ahead optimization and real-time local control is proposed to resolve voltage regulation problems such as network loss increase, voltage fluctuation and voltage crossing caused by large number of photovoltaic (PV) connections to the distribution network. On the day-ahead scale, an uncertain optimization model is constructed with the expected network loss, voltage drift and voltage overrun risk as the objectives, the on-load tap changer (OLTC) and capacitor bank actions is taken into account as well as the PV inverter reactive power generation constraints. On the real-time time scale, the approximate relationship between the inverter reactive power output increment and the PV real-time power output prediction error is derived using the day-ahead optimization results as the operational reference point, and a real-time autonomous voltage/var control strategy relying only on local real-time information is constructed. The effectiveness of the proposed hybrid time-scale voltage/var control strategy is proved by the simulation of the modified IEEE 33 system.
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2022, Vol. 37 
