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Control method for realizing passive off-network seamless switching by using energy storage converter

A technology of an energy storage converter and a control method, which is applied to electrical components, emergency power supply arrangements, circuit devices, etc., to achieve the effect of improving the reliability of power supply

Active Publication Date: 2015-01-21
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a control method for realizing passive off-grid seamless switching by using an energy storage converter. Voltage, phase, realize seamless disconnection between the main grid and the micro grid

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  • Control method for realizing passive off-network seamless switching by using energy storage converter
  • Control method for realizing passive off-network seamless switching by using energy storage converter
  • Control method for realizing passive off-network seamless switching by using energy storage converter

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Embodiment Construction

[0031] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] The structure of the microgrid system with distributed power is as follows: figure 1 , the 380V busbar of the distribution network of the micro-grid system is composed of the energy storage system, new energy and load through the grid-connected switch QF1. New energy includes wind power and photovoltaic systems.

[0033] When the grid is powered off, the grid-connected switch QF1 is switched off, the energy storage system performs V / F control to supply power to the load, and wind power and photovoltaics transmit power to the micro-grid according to the grid-connected working conditions; when the grid supplies power, close the grid-connected switch In QF1, the energy storage system, wind power, and photovoltaic systems all operate under grid-connected control. In order to ensure the uninterrupted power supply of ...

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Abstract

The invention relates to an energy storage converting control technology, and in particular relates to a control method for realizing passive off-network seamless switching by using an energy storage converter. The method comprises the following steps of: (1) determining that an energy conversion system PCS of an energy storage system is in a grid-connected state; (2) recording the Nth three-phase line voltage sampling value of a power grid, wherein N is a natural number; (3) determining the difference between the Nth three-phase line voltage sampling value of the power grid and the (N-M)th three-phase line voltage sampling value of the power grid; (4) judging whether the difference in the step (3) associated with any one phase of the three phases is greater than 15% of the maximum value of the rated voltage or not; (5) when a counter K is greater than or equal to 3, marking the passive off-network position; and (6) when the passive off-network position is marked, the energy conversion system PCS of the energy storage system enters into the off-network state. The method provided by the invention can be used for realizing seamless switching between the grid-connected network and an independently operated off-network for a micro-network, so that power supply is continuously supplied by voltage and frequency in the micro-network, and the load power supply reliability in the micro-network is improved.

Description

technical field [0001] The invention relates to an energy storage converter control technology, in particular to a control method for realizing passive off-grid seamless switching by using an energy storage converter. Background technique [0002] The application of energy storage technology is an important part of the construction of a strong smart grid. It can effectively realize demand side management, eliminate the difference between day and night peaks and valleys, smooth load, improve the operation efficiency of power equipment, reduce power supply costs, and can also be used to promote renewable energy. It is a means to improve the stability of power grid operation, adjust frequency, and compensate for load fluctuations. [0003] Energy storage devices mainly realize energy storage, release or fast power exchange. The grid access device realizes the two-way transmission and conversion of energy between the energy storage device and the grid, and realizes functions su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J9/06
Inventor 李官军胡金杭陶以彬杨波俞斌桑丙玉冯鑫振
Owner CHINA ELECTRIC POWER RES INST
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