Reactive Power Optimal Control of a Wind Farm for Minimizing Collector System Losses

Abstract

A reactive power/voltage control strategy is proposed that uses wind turbines as distributed reactive power sources to optimize the power flow in large-scale wind farms and reduce the overall losses of the collector system. A mathematical model of loss optimization for the wind farm collector systems is proposed based on a reactive power/voltage sensitivity analysis; a genetic algorithm (GA) and particle swarm optimization (PSO) algorithm are used to validate the optimization performances. The simulation model is established based on a large-scale wind farm. The results of multiple scenarios show that the proposed strategy is superior to the traditional methods with regard to the reactive power/voltage control of the wind farm and the loss reduction of the collector system. Furthermore, the advantages in terms of annual energy savings and environmental protection are also estimated.

Reactive Power Compensation with PV Inverters for System Loss Reduction

“…are predominately used in high voltage (HV) transmission systems. However, in recent years, there have been several contributions [2][3][4][5][6][7][8][9][10] where usage of grid-connected photovoltaic (PV) system inverters for reactive power generation (i.e., compensation) in distribution systems was proposed.…”

“…In Reference [7] a reactive power and voltage control strategy is proposed in order to reduce overall losses in the wind farm. Reactive power/voltage sensitivity matrix is used to optimize power flows.…”

“…These additional losses yield opportunity costs since active power generation must be reduced in order to generate reactive power. These additional opportunity costs for PV inverters operating at power factors less than unity is often neglected by researchers (e.g., in References [7][8][9]). This in turn could present a major obstacle for reactive power compensation by PV inverters for network losses reduction.…”

Reactive power dispatch of DFIGs in wind farm based on multi‐object optimization

“…The PMSG is also easier than the DFIG due to the var decoupling by the B2B converters . There are already papers about var control and optimization to them, although using the simplified description of the WT without the generator and B2B converters . For the DFIG‐basedfarm, there are papers dispatching its total reactive power from system level.…”

“…[9][10][11][12] There are already papers about var control and optimization to them, although using the simplified description of the WT without the generator and B2B converters. [13][14][15] For the DFIG-basedfarm, there are papers dispatching its total reactive power from system level. Hence, the reactive power dispatch of the DFIGs in the wind farm is to be studied, which may be applied to the PMSGs, the SVCs, the shunt capacitors, or the system dispatch with multiple wind farms.…”