考虑潮流及灵敏度一致性的风电场静态等值新方法

A New Method on Wind Farm Static Equivalent Based on Power Flow and Sensitivity Consistency

随着风电的快速发展,在电力系统分析中对风电场进行详细建模越来越困难,因此风电场等值越来越重要。针对现有方法的不足,提出一种新的风电场静态等值方法。该方法全面考虑边界节点为PV或PQ节点的情况,通过严格的理论推导,可以保持等值前后电力系统潮流及灵敏度的一致性,保证风电场静态等值的适应性和准确性。此外,通过灵敏度加权的方法对等值对地电容进行修正,可进一步保证风电场对边界节点电压无功响应的准确性。仿真结果验证了所提方法的有效性。

With the rapid development of wind power, detailed modeling of wind farms has become more and more difficult, which makes the wind farm equivalent are increasingly important in power system analysis. Existing equivalent methods of wind farm still has many defects. Therefore, a new method on wind farm static equivalent was proposed. This method considers the case that boundary node is PV or PQ comprehensively. With strictly theoretical derivation, it can keep the power flow and sensitivities of power system as well as boundary node consistent before and after the equivalent, which ensure the adaptability and accuracy of wind farm static equivalent. In order to ensure the accuracy that wind farm responses to the voltage and reactive power of power system and boundary node, weighted sensitivity method was used to correct the equivalent grounding branch. The simulation results demonstrated the effectiveness of the proposed theory.