Integrated control method for micro-grid load and energy accumulation

Abstract

The invention discloses a high-precision load control method based on mirror image droop and virtual inertia control. Controllable loads and energy accumulation in a micro-grid are integrally controlled, load control precision is increased, purposes of the controllable loads are expanded, micro-grid dependence on energy accumulation power and capacity is relieved, energy accumulation configuration is lowered, a 'negative power source' participates in peer-to-peer control of a distributed power source during micro-grid operation, and 'general energy accumulation' participates in micro-grid emergency control under fault conditions such as island converting to grid-connection. By the method, stable micro-grid frequency is achieved, tie line power fluctuation is restrained, and accordingly safe and stable operation capability of the micro-grid is increased.

Description

technical field [0001] The invention belongs to the field of micro-grid operation control, relates to the application of controllable loads in power systems and micro-grid technology, and in particular to a high-precision load control method for micro-grids based on mirror drooping and virtual inertia control. Background technique [0002] Microgrid is an emerging energy transmission mode that increases the penetration rate of renewable energy and distributed energy in the energy supply system. Its components include different types of distributed power sources, energy storage systems, load user terminals, and related control and protection. device. Among them, the intermittent and random characteristics of renewable energy output will have adverse effects on the microgrid. Compared with the large interconnected grid, the microgrid is a low-global inertia system with a small capacity and poor anti-disturbance ability. The quality requirements are higher, and there are parti...

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Problems solved by technology

[0005] The current research on microgrid operation control focuses on how to make the energy storage system play an active role. Load control continues the conventional idea of ​​low-frequency load shedding in large power grids, but energy storage equipment is expensive and maintenance costs are high; The load structure and power supply control methods in the power grid are unique. These problems cannot be ignored. Therefore, compared to relying solely on energy storage systems, load coordinated control is an effective new technology approach to solve the problem of micro-grid security and stability.

At present, there are relatively few studies on the application of load control in the stable operation of microgrids and its interaction mechanism with distributed power sources and energy storage, and there is no extensive development.

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