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Real-time coordination and control method of photovoltaic micro-grid system

A real-time coordination and control method technology, applied in photovoltaic power generation, AC network load balancing, single network parallel feeding arrangement, etc., can solve the problem of low power control accuracy and achieve the effect of power optimal matching

Active Publication Date: 2014-12-24
EAST GRP CO LTD
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Problems solved by technology

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

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Embodiment

[0039] The following is a specific embodiment of the present invention for a photovoltaic microgrid system composed of photovoltaic power generation, lead-acid battery packs, supercapacitors, and AC loads and DC loads.

[0040] Please refer to figure 1 , the real-time coordinated control method of the photovoltaic microgrid system according to the present invention includes: a central real-time optimization control layer and a local control layer. Among them, the central real-time optimization control layer collects the AC bus voltage and frequency of the photovoltaic microgrid system, the state of charge of the battery pack, the output power of the photovoltaic power generation micro-source, the output power of the battery pack, the output power of the supercapacitor, and the real-time power of the load in real time. Forecast curves and photovoltaic power prediction curves, through optimization models, optimization strategies and evaluation mechanisms, according to the total ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32
CPCY02E10/56Y02E70/30
Inventor 茆美琴董颖张榴晨苏建徽杜燕汪海宁徐海波
Owner EAST GRP CO LTD
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