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What are the requirements for the energy storage inverter testing standards?
In every industry, development moves from a non-standard state toward standardized practices. The establishment of national or industry standards plays a crucial role in accelerating this process. In the energy storage sector, the "GB/T 34133-2017 Energy Storage Inverter Testing Standard" has provided a solid foundation for the standardized testing of energy storage inverters. But what exactly does this standard entail? What challenges do test procedures face? This article will explore these questions in detail.
**What is the “GB/T 34133-2017 Energy Storage Inverter Testing Standard�**
The standard was developed jointly by the China Electric Power Research Institute, Sunshine Power Co., Ltd., Beijing Qunling Energy Technology Co., Ltd., and Xuji Power Co., and officially came into effect on February 1, 2018. It outlines comprehensive testing requirements specifically for energy storage inverters, ensuring they meet quality and performance benchmarks.
**What are the specific test contents outlined in the national standard?**
The technical specification covers various aspects of energy storage inverter testing, including charge and discharge performance, off-grid switching, efficiency, overload capability, power quality, power control, grid adaptability, low voltage ride-through capability, anti-islanding protection, environmental and safety testing, protection functions, and electromagnetic compatibility. Most of these tests align with those used for photovoltaic (PV) inverters, which makes the process more convenient for many users in the industry. Testing companies have largely adapted to these requirements.
However, there are unique challenges within the GB/T 34133-2017 standard. One of the most complex parts is found in Section 6.5, which focuses on power quality testing. This section not only requires harmonic and interharmonic detection but also mandates that the test values be statistically calculated over a 10-minute period. This presents a significant challenge for testing institutions and manufacturers alike.
ZLG Zhiyuan Electronics conducted visits to several testing laboratories and PV and energy storage companies, and found that few had an effective solution for this specific requirement. After understanding the needs of users, ZLG Zhiyuan Electronics decided to develop a test plug-in based on their power analyzer system. This tool enables accurate testing of harmonics and interharmonics according to the GB/T 34133-2017 standard.
The test results demonstrated the effectiveness of the new solution, showing clear and precise data for both harmonic and interharmonic measurements over the required time frame. These findings highlight how innovative tools can help overcome the challenges posed by the latest energy storage inverter standards.