A Coordinated Active–Reactive Power Optimization Method for Renewable Energy Bases Considering Terminal Voltage Security and Network Loss
In integrated wind–PV–storage renewable energy bases, the constituent stations are electrically coupled to a significant degree. At the same time, the temporal mismatch between the active-power delivery schedule issued by the dispatch center and the available wind and PV generation, compounded by the uneven voltage profile produced by collector-line impedance, readily drives the terminal voltage of end-of-feeder turbines beyond its limit. This paper proposes a coordinated active–reactive power optimization method that jointly addresses turbine terminal voltage security and network loss. The method treats battery charging and discharging, wind and PV output, and the reactive power of every source as the decision variables of a single global optimization, convexifies the problem through a second-order cone relaxation, and thereby balances the allocation of active and reactive power. A model predictive control framework then coordinates the cross-period scheduling of storage together with the reactive power of all sources. Case studies show that, compared with conventional unified power factor control, the proposed method raises the level of terminal voltage security and lowers system network loss while still satisfying the dispatch command tracking requirement.