风力发电系统 — 第21部分第4节：电气特性的测量与评估 — 风机部件和子系统的电气特性

[中文适用范围]： IEC TS 61400-21-4:2025 规定了统一的方法，定义了风力涡轮机组件和子系统的电气特性的测量、测试和评估程序，作为验证风力涡轮机和风力涡轮机系列电气能力的基础。该文件包括以下方面： - 测试台、子系统和接口的定义； - 定义测试台执行相关测量（电网强度、短路功率、THD 等）的系统要求； - 量化电气特性的测量程序； - 验证和确认组件和子系统电气特性是否符合电网合规性要求的测试和测量程序； - 在测试台上测得的组件和子系统测试结果向 WT 产品系列的可转移性程序； - 组件、子系统和风力涡轮机的文档要求和验证程序。风力涡轮机组件和子系统的测量和评估结果将用作 IEC 61400-21-1 中所述的电气能力验证的输入，以及 IEC 61400-27 中所述的风力发电厂 (WPP) 电气仿真模型的确认和验证的输入。 [外文原描述]： IEC TS 61400-21-4:2025 specifies a uniform methodology, defining measurement, testing and assessment procedures of electrical characteristics of wind turbine components and subsystems, as basis for the verification of the electrical capabilities of wind turbines and wind turbine families. This document includes the following aspects: - definitions of test bench, subsystems and interface; - definitions of system requirements for the test bench to perform relevant measurements (grid strengths, short circuit power, THD, …); - measurement procedures for quantifying the electrical characteristics; - test and measurement procedures for verifying and validating the electrical characteristics of components and subsystems in relation to grid compliance requirements; - procedures for the transferability of the component and subsystem test results, measured at the test bench, to WT product families; - documentation requirements and validation procedures of components, subsystems and wind turbines. The results of the measurements and assessments of the wind turbine components and subsystems will be used as input for the verification of electrical capabilities as described in IEC 61400-21-1 and for the validation and verification of the electrical simulation models for wind power plants (WPP) as described in IEC 61400-27.