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.
In view of more and more new energy access to the power grid, this paper proposes a new energy maximum access capacity calculation method, which considers four factors: voltage fluctuation, voltage deviation, harmonic current and transmission capacity. In addition, it develops a set of computing software platform. The platform is based on Python language. The input format file of the platform is a common excel file, which is simple, convenient, flexible and easy to operate. The platform can calculate the maximum access capacity of new energy under the specific grid structure, and give the reasons for limiting access only after inputting the line parameters, new energy parameters, node parameters, transformer parameters, etc.
Facing the rapid development of renewable energy which is represented by wind and photovoltaic power generation, the installed capacity of renewable energy in the power system is increasing with each passing day. While the proportion of wind and photovoltaic power in the total installed power supply of the system is small, the power system is able to fully accept wind power and photovoltaic grid-connected power generation; However, when wind power and photovoltaic reach a certain scale, the intermittency and volatility of their output make their influence on the system not negligible, so it is necessary to study the acceptance capacity of renewable energy. In this paper, based on many innovative energy sources which are connected to the power grid in a certain region, the corresponding model is established, and the risk analysis of different innovative energy links correlating with the power grid and the optimization operation research are carried out.
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