Photovoltaic inverter conversion efficiency test solution
Photovoltaic inverter (PV inverter or solar inverter) is an inverter that can convert the variable DC voltage generated by photovoltaic (PV) solar panels into mains frequency alternating current (AC), which can be fed back to the commercial power transmission system or used to supply electricity. Off-grid grid use. The photovoltaic inverter is one of the important balance of systems (BOS) in the photovoltaic array system and can be used with general AC power supply equipment.
The conversion rate of a photovoltaic inverter refers to the efficiency with which the inverter converts electricity generated by solar panels into electricity that meets grid standards. In the photovoltaic power generation system, the inverter plays the role of converting the DC power emitted by the solar panel into AC power, and transmits the AC power to the power company's power grid. The conversion efficiency of the inverter is high, and the power for home use and sale can be Increase.
Photovoltaic inverters have certain losses. In order to generate greater benefits for customers, national standards and corporate standards have given a limit value for the conversion efficiency of the entire machine. Only in this way can the inverter market be regulated and the best interests of customers ensured. . This limit is not given blindly, but is a value obtained through precise calculations and extensive testing. The conversion efficiency of the inverter with a transformer shall not be less than 94%, and the conversion efficiency of the inverter without a transformer shall not be less than 96%. In order to win market competition, companies must improve the conversion efficiency of their products.
Suita Electric's SPAW7000 power analyzer can be equipped with SCTX/H series current sensors. When the test current is less than 50A, it can be directly connected to the measurement. When the test current is greater than or equal to 50A, it can be connected to Suita Electric's current sensor. It is convenient without additional power supply. It can accurately obtain the open circuit voltage Vo, short circuit current Is, maximum output power Pm, voltage Vpm at maximum output power, current Ipm at maximum output power, inverter conversion efficiency and other parameters of the photovoltaic test system, and can record real-time data for testing. analyze.
Connect the high-precision power analyzer to the DC side and AC side of the inverter, and collect the DC side input voltage, input current and AC side output during the full power period of the inverter every 50ms (20 times per second) from morning to night. voltage and transmission current, respectively calculate the output power and output efficiency at each collection time point (per minute). In order to intuitively display the inverter efficiency, the conversion efficiency under different load conditions can be fitted to obtain the output efficiency distribution trend chart. At the same time, the output efficiency distribution trend chart can be obtained according to different The conversion efficiency under load factor conditions is used to calculate the average weighted total efficiency of the inverter. When large current measurement is required, it can be used with a current sensor to achieve accurate measurement of multiple current levels.
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