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.
Highlights
IntroductionDue to the advancements in wind generation and the increase in the size of wind farms (WFs), the uncertainty of wind power has a larger impact on the system stability and operational benefits
Due to the advancements in wind generation and the increase in the size of wind farms (WFs), the uncertainty of wind power has a larger impact on the system stability and operational benefits.WFs are required to have the ability to support voltage and reactive power at the point of common coupling (PCC) according to the Grid Code, which requires a well-configured reactive power control system [1]
The mainstream doubly-fed and direct-driven wind turbine (WT) operates continuously between 0.95 power factor lead and 0.95 lag because both of their converter systems have good reactive power control capability [7]. These WTs could be regarded as reactive power compensation devices that can be flexibly controlled at low costs in WFs
Summary
Due to the advancements in wind generation and the increase in the size of wind farms (WFs), the uncertainty of wind power has a larger impact on the system stability and operational benefits. Some researchers have enhanced the voltage stability of each bus in the WF via precisely coordinated control in case of a failure [4,5] This method is not suitable for reactive power dispatching under normal operations because of economic reasons [6]. The mainstream doubly-fed and direct-driven wind turbine (WT) operates continuously between 0.95 power factor lead and 0.95 lag because both of their converter systems have good reactive power control capability [7] These WTs could be regarded as reactive power compensation devices that can be flexibly controlled at low costs in WFs. In a large-scale WF, transformers and collector circuits are more abundant than in other power plants, contributing to greater losses [8]. Ybus Y isbus created and and is used for the flow flow analysis under specific wind conditions
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