Abstract
Cascading trip faults in large-scale wind power centralized integration areas bring new challenges to the secure operation of power systems. In order to deal with the complexity of voltage security regions and the computation difficulty, this paper proposes an autonomous voltage security region (AVSR) for each wind farm and the point of common coupling (PCC) substation, whose voltage can be controlled in a decoupled way. The computation of the AVSR can be completed using a stepwise search method exchanging voltage and power information between the control center and the wind farms. At each wind farm, an AVSR is determined to guarantee the normal operation of each wind turbine generator (WTG), while in the control center, each region is designed in order to guarantee secure operation both under normal conditions and after an N -1 contingency. A real system in Northern China was used to carry out case studies to verify the effectiveness of the AVSRs proposed, and good performance was demonstrated using the Monte Carlo method.
Highlights
AS the most promising renewable energy source (RES), wind power is widely used over the world
In order to deal with the complexity of voltage security regions and the computation difficulty, this paper proposes an autonomous voltage security region (AVSR) for each wind farm and the point of common coupling (PCC) substation, whose voltage can be controlled in a decoupled way
An AVSR is determined to guarantee the normal operation of each wind turbine generator (WTG), while in the control center, each region is designed in order to guarantee secure operation both under normal conditions and after an N-1 contingency
Summary
AS the most promising renewable energy source (RES), wind power is widely used over the world. In order to deal with the large-scale cascading trip problems and keep the wind farms working under normal and safe state, voltage security region is proposed to determine voltage operation ranges for all the important buses in the wind pool area. The AVSR in this paper is proposed from the perspective of security, aims to deal with the large-scale cascading trip faults caused by high-voltage protection systems of WTGs when the terminal voltages of WTGs exceed their upper bounds after an N-1 contingency. The stepwise search method proposed in this paper does not require iteration, and the necessary constraint information is exchanged only once between the control center and each wind farm, resulting in less necessary computation time. The effectiveness of the proposed stepwise method is demonstrated by Monte Carlo simulation in Section III followed by conclusions
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