Micro grid stabilization controller

Abstract

The invention relates to a microgrid stabilization controller, which comprises a two-way inverter circuit, a control circuit and a signal acquisition circuit, wherein the signal acquisition circuit is used for acquiring direct current side and alternating current side electric signals of the two-way inverter circuit; the control circuit is provided with a microprocessor; the microprocessor is connected with the two-way inverter circuit by a PWM (pulse-width modulation) drive and control circuit. When an isolated grid mode and a grid-connection mode are mutually switched, firstly, follow-up correction is performed on one or more than one of voltage, frequency, phase and power of another operation mode under a current operation mode, and then, the current operation mode is switched into the other operation mode after the requirement is met. As a dedicated controller of microgrid energy storage equipment, the microgrid stabilization controller provided by the invention can be used for realizing plug and play of the energy storage equipment to a microgrid, and can be used for realizing smooth handoff between isolated grid mode and the grid-connection mode, and therefore, the power supply interruption problem when the grid-connection mode is converted into the isolated grid mode is solved, and the operation of the microgrid under various stable states and transient states is ensured.

Description

technical field [0001] The invention belongs to the technical field of micro-grid stability control, and in particular relates to a control device specially used for connecting energy storage equipment to a micro-grid and controlling the energy storage equipment to adapt to various operating states of the micro-grid. Background technique [0002] The stable operation of the microgrid is the prerequisite for the safe, reliable operation and benefit of the microgrid. The microgrid must be grid-connected and connected, the isolated grid is stable, the isolation is fast enough, seamless switching, and the plug-and-play of the microgrid can be truly realized in order to give full play to its benefits. Due to the common characteristics of low overload capacity, small inertia or no inertia in micro-grid distributed power generation, and the sudden change of load in micro-grid, it is easy to cause micro-grid system oscillation or even collapse, which seriously restricts the developm...

AI Technical Summary

Problems solved by technology

Due to the common characteristics of low overload capacity, small inertia or no inertia of micro-grid distributed power generation, and the sudden change of load in micro-grid, it is easy to cause micro-grid system oscillation or even collapse, which seriously restricts the development and application of micro-grid.

In order to improve this situation, energy storage devices are usually used in the current microgrid structure to maintain the transient stability of the system and provide voltage and frequency support for the microgrid when necessary. , A mature control method that can meet the stable operation requirements of the microgrid in various operating modes

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