Distributed energy resource grid-connected and reactive compensation composite control system based on three levels

Abstract

The invention relates to a distributed energy resource grid-connected and reactive compensation composite control system based on three levels. The distributed energy resource grid-connected and reactive compensation composite control system comprises a controller, a three-level IGBT (Insulated Gate Bipolar Translator) converter, a direct-current bus capacitor and a filtering circuit, wherein the controller comprises a sampling module, a main control digital signal processor module and a PWM (Pulse-Width Modulation) isolation driving module; the sampling module is used for converting an acquired network voltage signal, a load current signal, an IGBT converter output current signal and a voltage signal of the direct-current bus capacitor into digital signal information, transmitting the digital signal information to the main control digital signal processor module, calculating reactive current and grid-connection power of the system, comparing the reactive current and grid-connection power of the system with set target values, sending a switching control command to the three-level IGBT converter through the PWM isolation driving module, and controlling outputs of grid-connection current and compensation current of each phase. The outputs of grid-connection current and compensation current of each phase of the system are controlled, so that a distributed energy resource access device can be applied to a regional power grid more intelligently; the distributed energy source grid-connection and reactive compensation composite control system has the characteristic of high grid-connection efficiency.

Description

technical field [0001] The invention relates to a distributed energy grid-connected control system, in particular to a three-level distributed energy grid-connected and reactive power compensation composite control system, which belongs to the field of grid-connected control of power grids. Background technique [0002] With the continuous and high-speed development of the world economy, the demand for fossil energy in countries around the world is increasing, which leads to the rapid consumption of fossil energy. In addition, the large-scale development and utilization of fossil energy affect the global climate, and cause acid rain, greenhouse effects, ozone layer depletion and a series of environmental problems. Research and practice have shown that solar energy is inexhaustible, clean and harmless. It is the most reliable and effective green energy to solve the world's energy crisis and environmental pollution. It is predicted that photovoltaic power generation technolog...

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Problems solved by technology

[0012] The present invention discloses a new scheme based on the three-level distributed energy grid-connected and reactive power compensation composite control system. By measuring the current situation of the system in real time, and analyzing the active and reactive components of the system through corresponding algorithms, and setting Comparing the adjustment target value, controlling the switch of IGBT, so as to control the output of grid-connected and compensation current of each phase of the system, and finally make the system output the maximum grid-connected power in the mode of active power priority, and compensate the system first in the mode of regional reactive power priority Reactive current, providing active and reactive power compensation of the system in regional balance mode, which solves the problems of high cost, single function and low utilization rate of the existing distributed grid-connected control system

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