This paper investigates the impact of integrating large-scale Doubly-Fed Induction Generator (DFIG)-based wind energy conversion system (WECS) on the voltage stability of the 52-bus, 330 kV Nigerian power grid. Indices derived from Active Power–Voltage (PV) and Reactive Power–Voltage (QV) analyses have been utilized to determine the voltage stability limits in terms of the maximum active power margin (APM) and minimum reactive power margin (RPM) of the system with the associated critical voltage-reactive power ratio (CVQR) of the system buses. Simulations have been done in DIgSILENT PowerFactory and the results analysed using MATLAB. This work also demonstrates the effectiveness of DFIG-based WECS in mitigating the overvoltage issues in the Northern region by ensuring that all bus voltages are within the acceptable limits of 1.0 ± 0.05 p.u. The results show that the optimal DFIG-based WECS penetration level (PL) that satisfies a bus voltage criterion of 1.0 ± 0.05p.u with the APM and CVQR not falling below their respective base case values and the loading of all critical power system equipment not exceeding 80% is 35%. Therefore, this work has demonstrated the possibilities of large-scale DFIG-based WECS as a viable solution for voltage stability improvement of a weak National grid while meeting the increasing energy demand.

中文翻译：

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集成大型双馈风能转换系统对弱国电网电压稳定性的影响——以尼日利亚电网为例

本文研究了集成基于大型双馈感应发电机 (DFIG) 的风能转换系统 (WECS) 对 52 节点、330 kV 尼日利亚电网电压稳定性的影响。利用有功功率-电压 (PV) 和无功功率-电压 (QV) 分析得出的指数来确定系统最大有功功率裕度 (APM) 和最小无功功率裕度 (RPM) 方面的电压稳定性限制与系统总线相关的临界电压无功功率比 (CVQR)。仿真已在 DIgSILENT PowerFactory 中完成，并使用 MATLAB 分析结果。这项工作还证明了基于 DFIG 的 WECS 通过确保所有母线电压均在 1.0 ± 0.05 pu 的可接受限度内，在缓解北部地区过电压问题方面的有效性。结果表明，基于 DFIG 的 WECS 的最佳渗透水平（PL ）满足母线电压标准 1.0 ± 0.05pu，APM 和 CVQR 不低于各自的基本情况值，并且所有关键电力系统设备的负载不超过 80% 的情况为 35%。因此，这项工作证明了基于 DFIG 的大规模 WECS 作为改善弱国家电网电压稳定性的可行解决方案的可能性，同时满足不断增长的能源需求。