双馈风电机组零电压穿越能力测试方案

Test Scheme of Zero Voltage Ride Through Capability for DFIG-based Wind Turbines

为测试双馈风电机组的零电压穿越能力,取得行业认可的检测报告,以在运行的某2MW双馈风电机组为例,开展了基于澳大利亚电网标准的零电压穿越能力测试。通过对不同电压跌落故障期间转子电流(电压)的理论分析,明确了机组控制策略及硬件设备的技术改造方向,结合预测试结果,仿真计算了Crowbar组件过流能力和Crowbar电阻阻值,优化了Crowbar电路的部分设计,最终选定了可通过测试的技术改造方案,为双馈风电机组优化运行和技术革新提供了理论指导,也为优化其并网能力提供了借鉴。

The zero voltage ride through（ZVRT）capability of an operating 2MW doubly fed induction generator（DFIG）based wind turbines is validated in accordance with Australian national electricity rules.First of all,a theoretical analysis is made of the rotor current（voltage）during diverse voltage sag faults.Then some possible improvements are discussed in order to optimize control strategies and physical devices.In addition,the design of the Crowbar is adjusted including its reselecting resistance and overcurrent capability via pretest and simulation.Finally,the feasibility of innovation is shown with the test results of zero voltage sag faults taken into account.The proposed scheme can provide theoretical guidance for practical DFIGbased wind turbines with optimal operation and technical innovation as well as optimal control design to improve its grid connection capability.