According to the Ministry of Industry and Information Technology "Regulations for PV Inverter Manufacturing Industry", the weighted efficiency of photovoltaic inverters containing transformers shall not be less than 96%, and the weighting efficiency of photovoltaic inverters without transformers shall not be less than 98%. If inverter-related companies guarantee inverter efficiency testing, how to make inverter efficiency testing simple and fast will be the key to winning in the industry.
According to the 13th Five-Year Plan of PV, between 2016 and 2020, China's PV installed capacity will sprint from tens of GW to 150GW, and the photovoltaic market will usher in an outbreak. As a key equipment for photovoltaic power plants, the PV inverter market will usher in development. . According to relevant authorities, PV inverters will grow at an annual growth rate of 11% from 2016 to 2020. By 2020, the global PV inverter market value will exceed US$7.1 billion.
PV inverter classification
At present, the competition in the photovoltaic inverter market is becoming increasingly fierce. Various types of inverters of various brands are also on the market. In general, in photovoltaic power generation systems, inverter follow-up can be divided into independent power supplies according to their applications. There are two types of grid connection. In the photovoltaic industry, the efficiency of the inverter is an important factor in determining the capacity of the solar cell and the size of the battery.
Photovoltaic inverter principle
The photovoltaic inverter is composed of a booster loop and an inverter bridge loop. The booster loop is mainly used to boost the DC voltage to the DC voltage required for the inverter output, and the inverter bridge loop is mainly used for boosting the loop. The DC voltage is converted to a fixed frequency AC voltage. Therefore, the function of converting direct current into an alternating current point is completed by the boosting loop and the inverter bridge loop.
Photovoltaic inverter function
The inverter not only has a direct AC conversion function, but also functions to maximize the performance of the solar cell and system fault protection. It can be summarized as automatic running and stopping function, maximum power tracking control function, anti-individual operation function (for grid-connected system), automatic voltage adjustment function (for grid-connected system), DC detection function (for grid-connected system), DC grounding detection Function (for grid-connected systems).
PV inverter efficiency measurement
Guangzhou Zhiyuan Electronics E6500 power quality and energy efficiency analyzer can quickly measure inverter conversion efficiency and power. Currently supporting one-way inverter and three-phase inverter measurement, the main test functions are as follows:
At the same time, since the power generation of the photovoltaic power station depends on the light intensity, the output power is indirect and unstable, and a certain amount of harmonic current is generated in the process of converting the direct current into the alternating current by using the inverter. Photovoltaic power generation is connected to the power grid through a large amount of electronic gas, which will have a great impact on the harmonic content of the power quality of the power grid, the three-phase voltage imbalance and the flicker. The E6500 power quality and energy efficiency analyzer has comprehensive monitoring of power quality functions, and at the same time creates the world's exclusive recording and analysis function. All the recorded data can be analyzed by the upper computer analysis software, and the power quality of the photovoltaic inverter can be analyzed more professionally and comprehensively. problem.
(The manuscript is provided by ZLG Zhiyuan Electronics)
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