DC-side capacitive inertia compensator design method based on frequency performance index

Abstract

The invention relates to a DC-side capacitive inertia compensator design method based on a frequency performance index. A compensator adopts an IDA-PBC control strategy, and the DC-side capacitive inertia compensator design method comprises the following steps of: 1) establishing a VSG small-signal model to obtain a quantitative relationship between an inertia and the frequency performance index of a power grid; 2) according to a synchronous generator frequency response curve, collecting the desired frequency performance index; 3) obtaining the expected inertia of the system based on the quantitative relationship obtained in step 1) and the expected frequency performance index; 4) establishing a DC bus voltage and frequency model to obtain the quantitative relationship between the DC sidecapacitance and the inertia; 5) obtaining the DC side capacitance design value based on the quantitative relationship obtained in step 4) and the desired inertia of the system; and 6) obtaining the control parameters of the IDA-PBC control strategy according to the DC side capacitance design value to achieve that the DC side bus voltage tracks the change of a reference value thereof. Compared to the prior art, the DC-side capacitive inertia compensator design method based on the frequency performance index can effectively improve the system inertia level and the frequency stability.

Description

technical field [0001] The invention relates to a design method of a power grid controller, in particular to a design method of a DC side capacitor inertia compensator based on a frequency performance index. Background technique [0002] Growing energy demand and environmental crisis are the main factors driving power grid reform. Under the current economic and environmental conditions, the development of renewable energy (Renewable Energy Source, RES), such as solar and wind energy, has become an important part of power grid reform. As the penetration level of renewable energy gradually increases, the grid-connected inverter interface is widely used in the power system. Since the grid-connected inverter does not have the rotational kinetic energy, it does not have the inertia and frequency regulation capability of the synchronous generator, thus reducing the power consumption of the system. frequency stability. [0003] In order to solve this problem, a virtual synchronous...

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Problems solved by technology

However, the virtual synchronous generator control needs to solve the quantitative relationship between the inertia and the expected frequency performance index, and in the renewable energy power generation system, in order to realize the VSG, it needs to be equipped with a certain amount of energy storage, which is difficult to be universal

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