Abstract
Solar photovoltaic (PV) has been developed rapidly due to its clean and green renewable characteristics. The connection of photovoltaic power generation to the traditional grid system is bound to bring power quality problems. Based on above, this paper introduces the power quality testing method of photovoltaic grid-connected power grid in detail. And then takes the Shanghai Qingpu Nanrong distributed photovoltaic power generation for example, which is the largest single roof photovoltaic power station in Shanghai by far, to use the method to test its power quality. The power quality index include harmonic, voltage imbalance, and frequency deviation. The test and analysis provide a reference for the monitoring and analysis of power quality of photovoltaic grid-connected power grid.
Highlights
At present, China is still based on thermal power generation
Solar photovoltaic power generation is inexhaustible and clean and environmentally friendly, so it has attracted wide attention [3,4,5,6,7].Under the influence of sustainable development and national energy strategy layout, more and more new distributed energy sources have been applied to modern power grid, and even many countries have the tendency to replace the conventional energy with distributed energy
When the PV power station is connected to the power grid, the voltage imbalance of the point of common coupling (PCC) should not exceed the requirements of GB/T 15543-2008 power quality three-phase voltage imbalance
Summary
China is still based on thermal power generation. the proportion of nuclear power, wind power and solar power is improved, the capacity of thermal power installed capacity still accounts for most of the total installed capacity of electric power, and the proportion of thermal power generation accounts for more than 80% of the total power generation [1]. If only 0.1% of the energy is converted to electricity by 5% conversion rate, the annual generating capacity can reach to 5600TWh, equivalent to 40 times the current world energy consumption. Photovoltaic power generation uses clean energy solar energy to generate electricity, which does not consume fuel and has no pollution to the environment. The quality index analysis provides a reference for monitoring and analyzing the power quality of grid connected PV system
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