According to the voltage level, photovoltaic power stations can be divided into three categories: firstly, photovoltaic power stations connected to the power grid with a voltage level of 66KV or above are called large-scale photovoltaic power stations; The second is that photovoltaic power stations connected to the power grid with a voltage level of 10-35KV are called medium-sized photovoltaic power stations; The third is that photovoltaic power stations connected to a low-voltage power grid with a voltage level of 0.4kV are called small-scale photovoltaic power stations.

A photovoltaic power station consists of four parts: a photovoltaic cell array, an inverter, a step-up transformer, and a control and protection device. The process of generating electricity and connecting to the grid is to first convert light energy into electrical energy through the photovoltaic cell array. The electrical energy is converted into AC power output through the inverter in the form of DC power. At this time, the AC power is low-voltage AC power, and then the voltage of the AC power is boosted and connected to the grid through the step-up transformer.

The power generated by a photovoltaic power station is measured by the amount of light it receives. Photovoltaic power generation is affected by the environment, resulting in high harmonic content and unstable power generation, thereby affecting the power quality of photovoltaic power generation.

The harmonics and high-order harmonic content generated by photovoltaic power stations, as well as the instability of their power generation, have brought a lot of pollution to the grid connection. So the photovoltaic power station must be connected to the power grid at the grid connection pointPower quality monitoring deviceLong term monitoring of photovoltaic power plant connection points and preservation of historical data for analysis.

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