Real-time Coordinated Control Method for Photovoltaic Microgrid System

Abstract

The invention relates to the technical field of photovoltaic micro-grid control, and particularly discloses a real-time coordination and control method of a photovoltaic micro-grid system. A central real-time optimal control layer and a local control layer are involved in the real-time coordination and control method. The central real-time optimal control layer collects the voltage and frequency of an AC bus of the photovoltaic micro-grid system, the charge state of a storage battery pack, the output power of photovoltaic power generation micro-sources, the output power of the storage battery pack, the output power of a super capacitor and the real-time power of a load in real time, generates a real-time coordination and control strategy and a secondary frequency modulation and scheduling plan, and issues the strategy and the plan to all local controllers. The local control layer coordinates and controls all the micro-sources in real time, and particularly achieves the scheduling plan issued by the central real-time optimal control layer. According to the real-time coordination and control method, a micro-grid central optimizing controller can manage, coordinate and control all the local controllers in a unified mode, the micro-grid can efficiently and economically run, the output power of the photovoltaic power generation unit is utilized to the maximum extent, the output power fluctuation and the tracking load change of the photovoltaic power generation unit are restrained, the running method of the micro-grid is reasonably adjusted, and energy balance is achieved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic microgrid control, in particular to a real-time coordinated control method for a photovoltaic microgrid system. Background technique [0002] Microgrid usually consists of renewable energy power generation systems such as wind energy, solar energy and biomass energy, clean energy power generation systems such as fuel cells and micro gas turbines, long-term and short-term energy storage devices such as battery packs and flywheels, and various electrical loads of various users. and heat load. The purpose of the real-time coordinated control method in the photovoltaic micro-grid system is that when the photovoltaic output power of renewable micro-power sources fluctuates greatly due to the influence of light and temperature, most power generation units are connected to the grid through inverters composed of power electronic devices. When the inertia is small, it can realize self-coordinated con...

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Problems solved by technology

The verification of the above method needs to provide effective and economical means, but so far there is no public report of related technology

[0007] In view of the above-mentioned research status of real-time energy coordination control methods for microgrids, it is found that although these methods can realize the on / off mode switching of microgrids, they still have the problem that the power control accuracy is not high, and they cannot be controlled on a time scale of milliseconds. real-time energy scheduling

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