For photovoltaic power generation, users are not only users of electricity, but also producers. Due to environmental impacts, photovoltaic power generation has high harmonic content and unstable power generation, all of which cause grid pollution and affect power quality. Therefore, in order to prevent serious pollution of power quality, the country has strict standards for photovoltaic power generation. Photovoltaic power stations must be equipped with Class A power quality online detection devices that meet the standards of IEC61000-4-30 "Electromagnetic Compatibility Part 4-30: Testing and Measurement Techniques for Power Quality" when connected to the power grid.

Through these standard specifications, the impact of photovoltaic power generation on power quality can be reduced. So household photovoltaic power generation needs to be installedPower quality monitoringdevice. However, the analysis of power quality currently requires careful screening of manufacturers and brands, as there is a mixed bag of fish and dragon in the market. The voltage input of the power quality monitoring device adopts a high voltage isolation module, and the current input uses a high-precision current transformer to isolate the input signal from the measurement system, greatly improving the anti-interference ability of the instrument.

Used to detect system frequency, grid harmonics, three-phase voltage imbalance, voltage fluctuation and flicker, voltage deviation, fundamental effective value and true effective value of voltage, fundamental effective value and true effective value of current, fundamental active power, fundamental apparent power, 2-63 harmonics, true power factor, and other parameters specified in all five national standards for power quality.

Meet the requirements of national standard A-level instruments. Reference algorithms are used for harmonics, three-phase imbalance, flicker, and fluctuations, without approximate calculations. High precision A/D (16 bit) is used for simultaneous sampling, with a collection rate of 12.8 kHz. The communication interface supports RS-232 and 485, and the power quality monitoring device has multiple testing channels and flexible configuration,It can measure 8 channels of 3-phase voltage signals and 8 channels of 3-phase current signals. Built in 512M memory, data is stored in units of 5 minutes, and each channel can continuously store 4 months of historical data.