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A microgrid and its energy storage scheduling method

An energy storage dispatching and microgrid technology, applied in the microgrid field, can solve problems such as affecting the economy, and achieve the effect of efficient utilization and improved service life.

Active Publication Date: 2016-12-28
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If this method is used in a microgrid with rotating loads, the energy storage battery is required to have a large enough capacity, which affects its economy.

Method used

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  • A microgrid and its energy storage scheduling method

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] like figure 1 As shown, the microgrid mainly includes photovoltaic modules, inverters, energy storage batteries, microgrid AC busbars (ie 400V AC busbars), rotating loads, ordinary loads (such as various household appliances), supercapacitors and motor variable frequency starters (Variable frequency starter), the rotating load is soft-started, and the frequency fluctuation during startup and operation is suppressed by the super capacitor; the photovoltaic module is connected to the AC bus of the microgrid through the inverter, and the output of the photovoltaic module is maintained at At the maximum power point, the supercapacitor is converted into AC by the inverter and connected to the AC bus of the microgrid, and the energy storage battery is connected to the AC bus of the microgrid through the inverter. When working, measure the main grid voltage and main g...

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Abstract

The invention discloses a microgrid and a stored energy dispatching method thereof. The microgrid mainly comprises a photovoltaic module, an inverter, a storage battery, a main network, a rotary load, a super capacitor, a variable frequency starting device and the like, wherein the photovoltaic module is connected onto an alternating current bus through the inverter; the super capacitor is connected onto the alternating current bus after being converted into alternating current through the inverter; and an energy storage battery is connected onto the alternating current bus through the inverter. According to the method, a stored energy operation mode is adjusted according to the state of the microgrid; when the rotary load is started, the super capacitor is adopted to discharge to balance photovoltaic power generation and loading; during the operation process of the rotary load, the super capacitor is preferentially adopted to output power, the discharge of the super capacitor is ended, and the energy storage battery outputs power. According to the microgrid and the stored energy dispatching method thereof disclosed by the invention, the problems that an impact effect is generated to the microgrid when the rotary load is started and the power supply reliability is low are solved; clean and renewable energy sources are fully utilized, and moreover, the waste of the clean and renewable energy sources is avoided; and the overall service life of the microgrid is prolonged while the power supply reliability of a user is guaranteed.

Description

technical field [0001] The invention relates to micro-grid technology, in particular to a micro-grid energy storage scheduling method with rotating loads. A reasonable scheduling method is adopted to safely start the load and ensure the stable operation of the micro-grid. Background technique [0002] With the rapid development of microgrid technology, the requirements for the reliability of microgrid power supply are getting higher and higher. However, there are some intermittent micro-sources and power loads in the micro-grid, which have adverse effects on the stable operation of the micro-grid system. Due to the characteristics of bidirectional flow and fast response, energy storage can effectively improve the power quality of microgrid and improve the stability of the system, and has become an indispensable part of microgrid. [0003] The existing micro-grid energy storage dispatch strategy is to dispatch micro-grids with common loads, that is, to judge the grid voltage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/32
CPCY02E10/56Y02E70/30
Inventor 高志强范辉唐宝锋徐文涛强东盛孟良梁宾潘啸
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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