Photovoltaic array electromagnetic transient simulation improved modeling method considering time delay

Abstract

The invention discloses a photovoltaic array electromagnetic transient simulation improved modeling method considering time delay, and the method comprises the following steps: 1), carrying out the electromagnetic transient simulation modeling of a photovoltaic power generation system, building an electromagnetic transient simulation model of the photovoltaic power generation system, and giving aninitial value and an initial step length of the system; 2) calculating a differential equation by using an implicit trapezoidal integral method, and establishing a whole-network equivalent electromagnetic admittance matrix and an equivalent injection current source, thereby obtaining an electromagnetic transient simulation equivalent model; 3) solving the algebraic equation according to an electromagnetic transient basic solution equation I = YU to solve the whole-network power flow, and further obtaining a photovoltaic electromagnetic transient model simulation result at the current moment;and 4) obtaining an equivalent electromagnetic admittance matrix and an equivalent injection current source of the system at the next moment according to the state quantity of the whole grid at the moment, and returning to the step 2) until the simulation is ended. The simulation speed and convergence performance of the large-scale electromagnetic transient simulation of the photovoltaic power generation system are improved.

Description

technical field [0001] The invention relates to the technical field of power system dynamic simulation and modeling, in particular to an improved modeling method for photovoltaic array electromagnetic transient simulation considering time delay. Background technique [0002] Since the global oil crisis broke out in the 1970s, solar photovoltaic power generation technology has attracted great attention in western developed countries. The photovoltaic industry has developed rapidly in the world, and the global photovoltaic installed capacity has grown at an alarming rate. According to the latest data from the International Renewable Energy Agency (IRENA), the newly installed capacity of grid-connected photovoltaics in the world in 2018 was 94.3GW, and the newly installed capacity of all renewable energy in the world was 171GW in 2018. More than half, the cumulative photovoltaic installed capacity accounts for about 1 / 3 of the world's renewable energy. Photovoltaic power gener...

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Problems solved by technology

At the same time, due to the shortage of market supply in the past few years, some enterprises have increased production expansion, and some backward production capacity has not been effectively withdrawn. The two factors are superimposed. In the case of slowing market growth, the industry will face a key turning point

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