Method for detecting operating parameters of photovoltaic power generation system

Abstract

The invention relates to a photovoltaic power generation system operation parameter detection method, which is characterized in that a power grid simulator is connected before the photovoltaic power generation system is connected to the internet, and the collection of operation data of the photovoltaic power generation system under a fault condition is completed on the premise of not influencing the operation of a power grid. When wiring is tested, the output of a photovoltaic inverter of a grid-connected unit of the photovoltaic power generation system is stopped firstly, the test system is connected in series into a grid-connected line of the photovoltaic power generation system, the photovoltaic inverter outputs alternating current and boosts the alternating current and then is connected in series into a wire inlet circuit breaker of the test system, and the alternating current and the boosts are connected into a power grid simulator after being subjected to voltage reduction through a step-down transformer. The power grid simulator simulates single-phase, two-phase and three-phase different types of power grid faults and power grid system frequency faults, then the voltage is recovered to the on-grid voltage level through the boosting transformer, and the power grid is accessed to the power grid through the on-grid circuit breaker. The method can play a key role in the operation of constructing a grid structure with relatively large photovoltaic power generation installed capacity.

Description

technical field [0001] The invention relates to the detection field of a photovoltaic power generation system, in particular to a detection method for operating parameters of a photovoltaic power generation system. Background technique [0002] In recent years, my country has vigorously supported the development of new energy technologies. With the rapid increase in the proportion of solar photovoltaic power generation installed capacity, the power system, like wind turbines, puts forward the requirements for the operation capacity of large and medium-sized photovoltaic power stations connected to the power grid when the power grid has a transient fault. The national standard "Technical Regulations for Connecting Photovoltaic Power Stations to the Grid" clearly requires that large and medium-sized photovoltaic power stations have fault ride-through capabilities. Since each photovoltaic photovoltaic inverter has a slightly different control method through fault ride-through, w...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to overcome the deficiency that the identification of the operating parameters of the photovoltaic power generation system cannot The operation data of type grid failure can provide sufficient operation data for the identification of photovoltaic power generation system operating parameters, and provide accurate identification basis for the operation parameters of photovoltaic power generation system under normal and fault conditions of the power grid