A Volt-Var Optimal Control for Power System Integrated With Wind Farms Considering the Available Reactive Power from EV Chargers

摘要

In order to fully take advantage of the available reactive power from EV chargers (EVCs), a volt-var optimal control (VVOC) strategy for power system integrated with wind farms is proposed. The VVOC strategy consists of two steps: day-ahead optimal scheduling and intra-day optimal adjustment. In the first step, on-load tap changers (OLTCs) and capacitor banks (CBs) are scheduled to minimize the power losses based on the day-ahead forecasted loads and wind power outputs. The second step consists of two scenarios: normal operation and breakdown operation. Under normal operation, only the EVCs are scheduled for the within-day adjustment of reactive power compensation. The breakdown operation is implement when the bus voltage violation occurs, and the CBs are scheduled with the minimum switching numbers for fast voltage recovery. A time-adaptive delay method is applied to the breakdown operation to avoid overcompensation. An IEEE-30 bus system is used to verify the effectiveness of the VVOC strategy for power system integrated with wind farms.