Comparison of industry standards between energy storage inverters and photovoltaic inverters

Solar photovoltaic, as a highly efficient, green and environmentally friendly renewable resource, has been gradually applied in various fields. Therefore, the development trend of the photovoltaic industry is orderly, but photovoltaic power generation has problems such as only generating electricity during the day, and the power generation is greatly affected by the weather, and there are unpredictable problems. Regarding the above problems, the energy storage inverter can perfectly solve them: when the load is low, the output power is stored in the battery, and the stored power is released during the peak load period to reduce the pressure on the power grid; when the power grid fails, it switches back to the off-grid mode to continue to supply power...

So what is the difference between photovoltaic inverters and energy storage inverters in terms of function?

The key lies in the following three points: the self-use rate of energy storage inverters is as high as 80%, while the self-use rate of traditional photovoltaic inverters is only 20%; when the city power fails, the grid-connected inverter is paralyzed, and the energy storage inverter still works efficiently; in the context of a continued decline in subsidies for grid-connected power generation, energy storage inverters are more profitable.

"GB_T34133-2017 Energy Storage Inverter Test Standard" testing standard

If the energy storage inverter industry wants to develop continuously and sustainably, it is naturally inseparable from the corresponding national industry standards. "GB_T34133-2017 Energy Storage Inverter Test Standard" is the standard specification standard for the energy storage inverter industry. The standard was jointly drafted by China Electric Power Research Institute, Sungrow Power Supply Co., Ltd., Beijing Qunling Energy Technology Co., Ltd., and Xuji Power Supply Co., Ltd., and was officially implemented on February 1, 2018.

"GB_T34133-2017 Energy Storage Inverter Test Standard" specifies the test standards for charge and discharge test, grid-connection and off-grid adjustment test, high efficiency test, load capacity test, power quality test, power control test, grid applicability test, low voltage ride-through test, anti-islanding protection performance test, environment and safety test, protection function test, electromagnetic compatibility test, etc. Senior engineers familiar with the industry will find that most of the test standards are the same as those for photovoltaic inverters, except that the test requirements for energy storage inverters are added in "Power Quality Test" in Chapter 6.5.

After reading this test standard in detail, it is not difficult to find that in addition to testing harmonics and interharmonics, the test values ​​of harmonics and interharmonics within 10 minutes must be estimated and counted, which is also the difficulty of testing in the energy storage inverter industry. The instrument equipment must have the three functions of detection, storage, and statistical analysis. After understanding the customer's testing requirements, Zhiyuan Electronics has developed a special test plug-in for "power quality detection" on the power analyzer, converting complex test items into one-button operation. Senior engineers only need to use the power analyzer to conduct a complete test of the harmonics and interharmonics of the energy storage inverter, and the test results will be displayed in the form of a report.