Selection method of control parameter of photovoltaic inverter

Abstract

The invention provides a selection method of a control parameter of a photovoltaic inverter, a reasonable control parameter can be selected, when an environment parameter is changed, the voltage and current values of a photovoltaic system can rapidly tend to be stablized, and the impact to a backbone network is avoided. The method comprises the steps of (S1) constructing the small signal stabilization model of the photovoltaic system based on a photovoltaic equipment parameter, a photovoltaic system line parameter and meteorology data where the photovoltaic system is located, (S2) establishing an object function according to the state matrix of the small signal stabilization model, optimizing the object function, summing the maximum real part and the maximum imaginary part in the eigenvalue of the matrix and then calculating a minimum value, and selecting the control parameter of the photovoltaic inverter according to the minimum value, wherein the real part is a negative value. The method is used for the photovoltaic generating field to select the control parameter of the photovoltaic inverter.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation, in particular to a method for selecting control parameters of a photovoltaic inverter. Background technique [0002] In recent years, due to the intensification of environmental pollution and the increase in global energy demand, how to further increase the proportion of renewable energy use has become a concern of various countries. Among them, solar energy, as an inexhaustible renewable energy source, has attracted much attention. How to utilize solar energy efficiently and safely has become an urgent problem to be solved. [0003] Photovoltaic power generation is an important aspect of solar energy utilization. A typical photovoltaic power generation system consists of a photovoltaic cell array and a photovoltaic inverter. The photovoltaic cell array converts solar energy into DC power, and the inverter then converts DC power into AC power and incorporates it into the system. In t...

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Problems solved by technology

In this process, due to the randomness and uncertainty of solar energy changing with the natural environment, the output power of the inverter is also unstable.

The output power of the inverter is controlled by the control loop. There are multiple proportional-integral controllers in the control loop. The control parameters of the proportional-integral controller determine the control effect of the entire control loop. If the control parameters are unreasonable, when When the environmental parameters change, the voltage and current values ​​are difficult to quickly stabilize, which will have an impact on the backbone network

But up to now, the selection of control parameters of the photovoltaic inverter system still mainly relies on empirical debugging, which has a certain degree of blindness

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