With the reduction of photovoltaic construction costs, the significant decrease in energy storage equipment costs, and the rapid development of new energy vehicles, a large number of charging piles have been built, leading to the rapid development of the new energy industry. At the same time, it has also brought new issues related to power quality to users, mainly including the following problems:

1. Harmonic problem

A large number of inverters convert DC power into AC power through the turn-on and turn off of semiconductor power switches, which can cause harmonic problems in the process.

2. Voltage fluctuation issue

The uncertainty of new energy generation causes random fluctuations in output power, leading to frequency deviation, voltage fluctuations, and flicker in the power grid.

3. DC component

The new energy generation system connected by power electronic devices will also have the impact of DC components.

According to the technical regulations for photovoltaic power stations connected to the power system GB/T 19964-2024 and the technical regulations for electrochemical energy storage power stations connected to the grid GB/T 36547-2024, the grid connection point of photovoltaic/energy storage power stations should be equipped with Class A power quality online monitoring devices that meet the requirements of the General Requirements for Power Quality Testing Equipment GB/T 19862-2005 standard, and the monitoring points should be placed at the grid connection point. Online monitoring of harmonics, DC components, voltage fluctuations and flicker, three-phase imbalance, and injected DC components that may be caused by photovoltaic/energy storage power stations. The device has a communication interface and remote transmission of power quality data function. The power quality data is transmitted to the power quality detection main station through the comprehensive business data network.

The Ankerui APView500 power quality online monitoring device adopts a high-performance multi-core platform and embedded operating system. According to the measurement methods for various power quality indicators specified in IEC 61000-4-30 "Testing and Measurement Techniques - Methods for Measuring Power Quality", the measurement integrates functions such as harmonic analysis, waveform sampling, voltage sag/sag/interruption, flicker monitoring, voltage imbalance monitoring, event recording, and measurement control. The device meets the national standard requirements in terms of standardization of power quality index parameter measurement methods, measurement accuracy of index parameters, clock synchronization, event alarm functions, and other aspects. The product has IEC61000-4-30 ClassA certificate, IEC60255 Electrical Performance and Electromagnetic Compatibility certificate, GB/T14598 Electrical Performance and Electromagnetic Compatibility certificate, and IEC62053 0.2s Measurement certificate. Can meet the power quality monitoring of new energy generation systems such as photovoltaic/energy storage/wind power.