Island isolated micro-grid energy control method

An energy control and microgrid technology, applied in power network operating system integration, wind power generation, energy storage, etc., can solve the problem of incomplete consideration of energy storage device characteristics, immature microgrid energy regulation strategies, and insufficient consideration of energy storage devices. Life loss problems and other problems, to achieve the effect of large benefits, ensuring stability and economic indicators, and low consumption

Active Publication Date: 2015-09-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] Although relevant personnel have conducted a lot of research, the existing micro-grid energy regulation strategies are still immature. These methods do not fully consider the life loss of energy storage devices in micro-grids, and only roughly consider them from the perspective of equipment maintenance or the loss of a certain process. It is not comprehensive to consider the characteristics of the energy storage device itself, so it is impossible to get a better reasonable and economical regulation plan in the formulation of the energy regulation plan of the microgrid

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Embodiment Construction

[0048] The structure of the island isolated microgrid in the present invention is as follows figure 1 As shown, it is mainly composed of doubly-fed wind turbines, batteries, supercapacitors, diesel generators, controllable loads and daily loads. Each device is connected to the 380V AC bus through its own converter or transformer. Among them, the doubly-fed wind turbine adopts the maximum power point tracking control method to ensure the maximum utilization of wind resources; the battery as an energy storage unit maintains the power balance of the microgrid through its converter using PQ control; the supercapacitor and its converter The generator adopts constant voltage and constant frequency control to dynamically maintain the voltage and frequency stability of the microgrid; the diesel generator is used as an emergency backup energy source, and participates in the regulation of the microgrid when wind power and energy storage cannot meet the load power.

[0049] The energy co...

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Abstract

An island isolated micro-grid energy control method comprises the steps of determining constitution of an island isolated micro-grid; determining control methods of units in the micro-grid; determining constraint conditions of the units in the island isolated micro-grid; formulating objective functions; and establishing an isolated micro-grid mathematic model to solve and obtain micro-grid energy control results. With full consideration of different life losses, of the stored energy, caused by deep charge and discharge and shallow charge and discharge of a storage battery at different states of charges, and in combination with revenue brought about by controllable loads, an energy control strategy aiming at micro-grid stability and economical operation under a long time scale is obtained; and a switching plane of the controllable loads and a generation scheduling of the micro-grid are made according to wind power prediction data, thereby achieving the aim of raising scientific and reasonable operating characteristics of the micro-grid.

Description

technical field [0001] The invention relates to the field of renewable energy power generation, in particular to a microgrid energy control method in an island isolated state. Background technique [0002] With the progress of society and the development of economy, traditional energy such as coal, oil, and natural gas is increasingly scarce, and how to solve the problem of resource shortage in today's society has become the focus of attention. Renewable energy has become the best choice to replace traditional energy due to its renewable and non-polluting advantages. Compared with traditional energy sources, most islands and their surroundings are rich in renewable energy sources, such as wind energy, solar energy, wave energy, tidal current energy, etc., all of which have great potential for development. By building an efficient and clean island energy system, especially vigorously developing island power grids, and effectively and rationally utilizing island new energy, n...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32H02J3/14
CPCY02B70/3225Y02E10/76Y02E70/30Y04S20/222
Inventor 刘青樊世通
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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