The group standard T/CES 304-2024/ T/CEEIA 836-2024 “Hardware-in-the-Loop Testing Specifications for Grid-Connected Performance of Photovoltaic Inverters” jointly published by the China Electrotechnical Society and the China Electrical Equipment Industry Association will be implemented starting December 30, 2024. This standard specifies the technical requirements for the preparation, testing platform, testing items and procedures, and testing reports for hardware-in-the-loop testing of photovoltaic inverters.
1. Drafting Units and Main Authors
(1) Drafting Units
State Grid Henan Electric Power Company Electric Power Research Institute, Southern Power Grid Electric Power Technology Co., Ltd., State Grid Ningxia Electric Power Company Electric Power Research Institute, State Grid Comprehensive Energy Service Group Co., Ltd., State Grid Gansu Electric Power Company Electric Power Research Institute, Shanghai Keliang Information Technology Co., Ltd., State Grid Shaanxi Electric Power Company Electric Power Research Institute, Chongqing University, Suzhou Electrical Science Research Institute Co., Ltd., State Grid Liaoning Electric Power Company Electric Power Research Institute, Hainan Power Grid Co., Ltd. Electric Power Research Institute, State Grid Hubei Electric Power Company Electric Power Research Institute, Guangxi Power Grid Co., Ltd. Electric Power Research Institute, Yunnan Electric Power Testing Research Institute (Group) Co., Ltd., Shanghai Yuankuan Energy Technology Co., Ltd., Sichuan Qingneng Intelligent Testing Technology Co., Ltd., TBEA Xi’an Electric Technology Co., Ltd.
(2) Main Authors
Teng Weijun, Liu Yang, Wang Hua, Guo Jingmei, Xue Fei, Zhou Xichao, Li Chaohui, Zhang Xujun, Zhang Fei, Sun Guangyu, Deng Jun, Du Xiong, Zhang Yafei, Du Chengmao, Zhou Yuhao, Ge Yangyang, Cheng Bing, Hu Pan, Xie Boyu, Song Yi, Sun Xin, Wang Mengjie, Zhao Yuwei, Wu Yangyang, Wang Xinxing, Xu Guanjun, Yang Shangxing, Zhou Hongwei.
2. Background of the Standard Development
(1) The characteristics of photovoltaic power generation, such as flexibility in installation, pollution-free, and noiseless operation, have led to rapid development in recent years. Under the context of a new power system, it is expected to develop even faster in the future.
(2) The grid-connected performance of photovoltaic power systems, including low and high voltage ride-through and grid adaptability, severely affects the safe operation of the power grid. Therefore, it is essential to verify their grid-connected performance and establish simulation models for validation.
(3) Verification of the grid-connected performance of photovoltaic power systems includes both field tests and type tests. Field tests are challenging, have limited operating conditions, and yield less data, with high costs and time requirements. Type tests may face inconsistencies between the controller software version and the actual operating conditions.
(4) Hardware-in-the-loop testing is superior to field tests and type tests in simulating grid connection conditions and controller software versions, making it suitable for verifying and modeling the grid-connected performance of photovoltaic inverters. However, there are currently no relevant standards for hardware-in-the-loop modeling and testing of photovoltaic inverters, making the establishment of this group standard necessary and urgent.
3. Main Content of the Standard
(1) Scope
This standard specifies the technical requirements for the preparation, testing platform, testing items and procedures, and testing reports for hardware-in-the-loop testing of photovoltaic inverters. It is applicable to the verification of grid-connected performance and model parameter identification data testing of photovoltaic inverters.
(2) Normative References
The main documents referenced in this standard include:
GB/T 19964-2012 Technical Specifications for Photovoltaic Power Plants Connected to Power Systems
GB/T 37408-2019 Technical Requirements for Grid-Connected Photovoltaic Inverters
GB/T 37409-2019 Technical Specifications for Testing Grid-Connected Photovoltaic Inverters
GB/T 40581-2022 Specifications for Safety and Stability Calculations of Power Systems
GB 38755-2019 Guidelines for Safety and Stability of Power Systems
(3) Terms and Definitions
This includes definitions for real-time digital simulators, real-time signal interfaces, and hardware-in-the-loop testing.
(4) General Requirements
This includes overall requirements for the simulation environment, testing preparation, testing platform requirements, testing items and procedures, and testing reports for hardware-in-the-loop testing of grid-connected performance of photovoltaic inverters.
(5) Testing Preparation
This includes testing environmental conditions, required materials, and sample requirements.
(6) Testing Platform
This includes functional requirements and model requirements for the testing platform.
(7) Testing Items and Result Determination
The main testing items include fault ride-through and grid adaptability. Fault ride-through includes low voltage ride-through and high voltage ride-through, while grid adaptability includes voltage adaptability and frequency adaptability. The result determination specifies the standard requirements that the testing results must meet.
(8) Testing Report
This includes: manufacturer, model, structure, and parameters of the photovoltaic inverter; testing time, testing unit, and testing personnel; calibration results of testing platform equipment; testing conditions; testing content; hardware-in-the-loop simulation testing waveforms, data analysis results; conclusions of hardware-in-the-loop simulation testing.
4. Benefits of Standard Development
This standard has broad applicability. It specifies the overall requirements, testing preparation, testing platform, testing items and procedures, and testing reports for hardware-in-the-loop testing of grid-connected performance of photovoltaic systems, providing a basis and reference for hardware-in-the-loop testing and model parameter testing of photovoltaic systems.
After the implementation of this standard, it will provide technical support for the safe operation of power grids with a high proportion of photovoltaic generation. Under the guidance of the “dual carbon” goal and the new power system with renewable energy as the main body, the installed capacity and generation of photovoltaic power are gradually increasing. This project has a broad market application prospect and is beneficial for enhancing China’s influence in the stable operation and management of power systems internationally.
(Source: Standardization Work Office)