Composite control method for distributed energy grid connection and reactive power compensation

Abstract

The invention relates to a distributed energy grid connection and reactive compensation composite control method, which comprises the following processes of obtaining real-time grid voltage VS, system current IS and DC bus voltage Vdc through a collection module and then transmitting the real-time grid voltage VS, the system current IS and the DC bus voltage Vdc to a digital signal processor DSP; and obtaining reactive current and grid-connected current in a load through calculation, comparing the reactive current and the grid-connected current with a set adjustment target value, generating a fixed-frequency PWM pulse through a PI controller to drive an inverter power tube IGBT to be turned on and turned off, controlling output of each phase of grid-connected current and compensation current of a system, and outputting the maximum grid-connected power by the system in an active priority mode, firstly compensating the reactive current of the system in a regional reactive priority mode and providing the system with active compensation and reactive compensation in a regional balance mode. Through controlling output of each phase of grid-connected current and compensation current of the system, a distributed energy access device can be more intelligently used for a regional power grid and has the characteristic of high grid-connection efficiency.

Description

technical field [0001] The invention relates to a distributed energy grid-connected control method, in particular to a distributed energy grid-connected and reactive power compensation composite control method, which belongs to the field of grid-connected control of a power grid. 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 technology, which is...

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Problems solved by technology

[0012] The present invention discloses a new scheme for distributed energy grid connection and reactive power compensation composite control method, through real-time measurement of the system current situation, through the corresponding algorithm to analyze the size of the active and reactive components of the system, and through comparison with the set adjustment target value , to control the switch of IGBT, thereby controlling 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 reactive current of the system first in the mode of regional reactive power priority. The active and reactive power compensation of the system is provided in the regional balance mode, which solves the problems of high control cost, single function and low utilization rate of equipment in the existing scheme

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