光伏系统性能 第2部分：功率性能指数和容量评估方法

[中文适用范围]： IEC TS 61724-2:2025适用于至少包含一个逆变器的并网光伏系统。该测试仅在逆变器交流输出不受限的情况下评估光伏系统的性能。本文件定义了光伏系统功率性能指数（PPI）的测试方法。PPI在IEC 61724-1中定义为：在测试条件下，系统实际测得的输出功率与根据系统设计预期输出功率的比值。该测试通常在三到五天的短时间内进行，通常用于在光伏电站最终完工时满足合同中的性能保证要求。本版取消并替换了2016年发布的首版。与前一版相比，本版包含以下重大技术更改：a) 根据IEC 61724-1最新版和当前行业惯例，对文档进行调整以适用于双面光伏系统；b) 考虑到目前高直流对交流比例（削峰）和互联限制（限电）带来的系统无限制运行时间减少，对测试程序进行调整；c) 调整测试程序，使其能够在有利条件下在三到五天的短时间完成测试；d) 更加侧重使用现代光伏系统建模软件，以获取被测系统的预期性能；e) 简化计算测试结果的数学步骤；f) 明确标识测试选项（测试过程中需要选择的可选项），并提供记录这些选项的模板；g) 明确区分被测变量和未被测变量的测试边界；h) 扩展并明确数据过滤的讨论内容。 [外文原描述]： IEC TS 61724-2:2025 applies to grid-connected PV systems comprising at least one inverter. The test evaluates the PV system only in conditions where output is unconstrained by limitations in AC power output from the inverters. This document defines a test of a PV system's power performance index (PPI). PPI, defined in IEC 61724‑1, is the ratio of a system's measured power output under test conditions to its expected output at those conditions based on the system's design. The test is intended to be performed over a short period of typically three to five days and is typically used to satisfy a contractual performance guarantee as part of the final completion of a PV power plant. This second edition cancels and replaces the first edition published in 2016. This edition includes the following significant technical changes with respect to the previous edition: a) Adapting the document for bifacial PV systems, in accordance with the latest edition of IEC 61724‑1 and current industry practices. b) Adapting the test procedure to account for the limited times of unconstrained system operation which are now common because of high DC-to-AC ratios (clipping) and interconnection limits (curtailment). c) Adapting the test procedure to achieve a test that can be performed in a short time of three to five days during favourable conditions. d) Focusing the document more heavily on the use of modern PV system modelling software to obtain the expected performance of the system under test. e) Simplifying the mathematical procedure for calculating the test results. f) Clearly identifying test elections (optional choices to be made in conducting the test) and providing a template for documenting these elections. g) Clarifying the discussion of the test boundary that separates tested variables from untested variables. h) Expanding and clarifying the discussion of data filtering.