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Application of CHIPSENSE Current and Voltage Sensor in Photovoltaic System--String/Centralized Photovoltaic System inverter

Foreword: A photovoltaic inverter is a core unit of a new energy system. Its performance directly affects the power generation efficiency, the service life of the equipment and the quality of the grid-connected power grid. Voltage and current sensors, as important "sensing organs" in the inverter, monitor and feed back key parameters in real time, and transmit them to the CPU for collection and calculation. The program finally makes precise control according to the algorithm and preset conditions. The correct use of these devices plays an important role in ensuring the normal operation of the equipment. This paper systematically describes the application scenarios of voltage and current sensors in photovoltaic inverters and the selection strategies of some devices. Taking CHIPSENSE current/voltage sensor as an example.

Differences between string and centralized inverters:

The photovoltaic inverter system is divided into two types: string and centralized, and the difference between the two is not large. Centralized is a single high-power inverter, suitable for large ground power stations, with high bus voltage, generally 1500V, and even some have reached 2000V. The usual power is about 320KW, which is cost-effective.

String power is small, low voltage, flexible configuration and use. The bus is roughly 600V voltage and about 50KW power. These low-power inverters, the output voltage is finally connected together and integrated into the transmission grid for transmission.

It can also be understood that a 320KW centralized photovoltaic inverter is 10 string-type 32KW photovoltaic inverters connected in parallel; string-type and centralized inverters have their own advantages and disadvantages and exist simultaneously.

CHIPSENSE is a national high-tech enterprise that focuses on the research and development, production, and application of high-end current and voltage sensors, as well as forward research on sensor chips and cutting-edge sensor technologies.

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