Robust residual error generator-based inverter parallel control method and system

Abstract

The invention relates to a robust residual error generator-based inverter parallel disturbance feedforward compensation control method and system. The method comprises the following steps that: the filtering inductance values, capacitance values and transition frequencies of inverter filters in a multi-inverter parallel topology under the condition that the reactive power of the inverter filtersis minimum are obtained; the Pl gain of a current loop and a voltage loop in a double-closed loop structure is calculated; a robust residual generator-based dynamic compensation control structure is established, and current and voltage loop dynamic compensation controller parameters are calculated; and dynamic compensation controller-based feedforward control is added, and the multi-inverter parallel topology is controlled according to the output current of each inverter. With the robust residual error generator-based inverter parallel disturbance feedforward compensation control method and system of the invention adopted, the influence of the parameter difference between the inverters on power equalization is alleviated on the premise of ensuring system stability, so that output voltage control is more stable.

Description

technical field [0001] The present disclosure relates to the field of power electronics, in particular, to a method and system for controlling inverter parallel disturbance feed-forward compensation based on a robust residual generator. Background technique [0002] With the gradual penetration of green energy brought about by the transformation of the energy structure, the distribution network, which is closely connected with the majority of users in the power system, needs to meet the large-scale access of distributed generation systems DGs and energy storage devices, and adapt to the needs of new loads such as electric vehicles. Plug and play, and meet the continuous improvement of users' requirements for power quality. Microgrid is an effective means to reduce the impact and impact of distributed power and flexible compliance on the power system. When the large power grid fails or is repaired, the microgrid can operate in off-grid mode to ensure high-quality uninterrupte...

AI Technical Summary

Problems solved by technology

[0005] The existing improved scheme adds more parameters related to droop control, and the parameter setting is complicated when the microgrid topology changes, and the relevant parameters of the original system need to be readjusted as the topology changes to achieve the purpose of improvement and ensure system stability. not conducive to plug and play

Inverters with different capacities will affect the power distribution when they are connected in parallel due to the difference in filter and controller parameters, which will worsen the circulation problem when multiple converters are connected in parallel and affect the overall stability of the system

At present, in practical applications, estimated values ​​are usually used to select relevant parameters based on experience. The errors will not only increase the volume cost of the filter, but also increase the loss of power electronic devices and reduce the service life.

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