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A multi-stage online mobile energy storage power supply system and its control method

A mobile energy storage and power supply system technology, applied in the direction of AC network load balancing, etc., can solve the problems of environmental and noise pollution, large frequency fluctuation, low efficiency, etc., to relieve power supply pressure, short start-up time, and improve service life.

Active Publication Date: 2020-10-13
CHINA ELECTRIC POWER RES INST +2
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AI Technical Summary

Problems solved by technology

[0003] At present, mobile power supply systems mostly use diesel generators as backup power sources, but diesel generators take 5 to 30 seconds to start, the power supply voltage and frequency fluctuate greatly, and the efficiency is low, and the use of diesel generators will inevitably bring about environmental and noise Pollution

Method used

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  • A multi-stage online mobile energy storage power supply system and its control method
  • A multi-stage online mobile energy storage power supply system and its control method
  • A multi-stage online mobile energy storage power supply system and its control method

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0040] The purpose of the present invention is to realize the online power supply of the mobile power supply system. In the case of grid connection, the system coordinates the PCS on the grid side, guarantees the DC / DC output on the DC bus side, ensures the power of the energy storage system, and ensures the constant voltage and constant frequency output of the PCS on the load side; In the case of off-grid, by coordinating the energy storage output of the DC side, the load-side PCS is guaranteed to supply power to the load; and when the off-grid mode is switched, the grid-side PCS and the bus-side DC / DC operation are coordinated to ensure the stability of the DC bus voltage and realize the stability of the load-side PCS output to realize seamless switching between the system and off-grid.

[0041] Such as figure 1 As shown, it is a multi-level online mobile ...

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Abstract

The invention provides a control method of a multistage online movable energy storage power supply system. The method includes the following steps that 1, power grid and system operation data is collected; 2, the operation state of a power grid is judged according to the collected data, if operation is normal, the charging power P1#PCS of a power grid side PCS and the discharging power P2#PCS of a load side PCS are calculated, and a step 3 is executed; otherwise, the power grid side PCS is shut down, the load side PCS conducts V / F operation, a direct-current bus side DC / DC conducts constant voltage control operation, and the step 1 is executed; 3, whether the power grid has a fault or not is judged, if the power grid side PCS is shut down, the load side PCS conducts V / F operation, and the direct-current bus side DC / DC conducts constant voltage control operation, or else control is conducted according to an SOC state. Seamless switching of grid-connected and off-grid modes can be achieved, power is supplied to a user on line, the service life of the energy storage system is prolonged, and operation cost of the system is reduced.

Description

technical field [0001] The invention relates to a mobile energy storage system and a control method, in particular to a multi-stage online mobile energy storage power supply system and a control method thereof. Background technique [0002] With the increasing dependence of modern society on electric energy, the rapid growth of electricity demand, and the higher and higher requirements for power supply quality, sudden power outages will inevitably cause damage to people's normal life order and the normal operation of society, especially For the particularly important loads in the primary load, once the power supply is interrupted, it will cause significant political influence or economic loss. As the main force of power grid emergency power supply equipment, mobile power vehicles have many advantages such as flexible maneuverability, mature technology, and rapid start-up. The electric field plays an increasingly significant role. In addition, mobile power vehicles are also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/32
CPCH02J3/32
Inventor 余豪杰李官军陶以彬杨波胡金杭桑丙玉周晨冯鑫振刘欢曹远志崔红芬庄俊鄢盛驰朱红保李跃龙卢俊峰张宇侯书毅孙博
Owner CHINA ELECTRIC POWER RES INST
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