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Battery energy storage system based power conversion system and control method thereof

A technology of battery energy storage system and power conversion system, which is applied in the direction of output power conversion device, flexible AC transmission system, battery circuit device, etc., and can solve problems affecting battery performance and service life, etc.

Active Publication Date: 2015-01-07
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the parallel connection of multiple groups of batteries will generate inter-group circulation, which will directly affect battery performance and service life

Method used

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  • Battery energy storage system based power conversion system and control method thereof
  • Battery energy storage system based power conversion system and control method thereof
  • Battery energy storage system based power conversion system and control method thereof

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Embodiment Construction

[0089] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0090] The topology of the power conversion system based on the battery energy storage system provided by the present invention is as follows: figure 1 As shown, the power conversion system includes a battery energy storage system, a bidirectional DC / DC converter, a grid-side converter, a filter circuit and an isolation transformer; The DC busbars are connected in parallel; the grid-side converter, filter circuit and isolation transformer are connected in sequence; the isolation transformer is connected to the power grid; the bidirectional DC / DC converter is used to switch the working mode of the battery energy storage system; the grid-side transformer The current converter is used to rectify the charging current when the grid charges the battery energy storage system; the grid-side converter is used to invert the DC vol...

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Abstract

The invention relates to a battery energy storage system based power conversion system and a control method thereof. The power conversion system comprises a battery energy storage system, a bidirectional DC / DC (direct-current) converter, a grid-side current transformer, a filter circuit and an isolated voltage transformer. The battery energy storage system is in parallel connection with a direct-current bus of the grid-side current transformer through the bidirectional DC / DC converter; the grid-side current transformer, the filter circuit and the isolated voltage transformer are connected in sequence; and the isolated voltage transformer accesses to a power grid. The control method includes sequentially monitoring the battery energy storage system, the bidirectional DC / DC converter, the grid-side current transformer, the filter circuit and the isolated voltage transformer by a control circuit. Since the battery energy storage system utilizes battery cells connected in series and is in parallel connection with the common direct-current bus through the bidirectional DC / DC converter, circulation among battery packs is avoided, and capacity expansion of the system is facilitated. Further, by the aid of the monitoring control strategy for SOC (super capacitor state of charge) of the battery energy storage system and battery end voltage, excessive charge or discharge state of the battery energy storage system is avoided, service lives of the battery packs are prolonged, and comprehensive service cost is lowered.

Description

technical field [0001] The invention relates to a power conversion system and a control method thereof, in particular to a power conversion system based on a battery energy storage system and a control method thereof. Background technique [0002] The battery energy storage system can quickly and independently adjust active and reactive power, and has high application value in load stabilization and power quality management. Especially in recent years, with the grid-connection of large-scale intermittent energy, its unique volatility and randomness have had an impact on the safe and stable operation of the power grid. The problem of accepting food has gradually come to the fore. At the same time, large-scale battery energy storage technology has been rapidly developed and applied in recent years, and the corresponding technical route has gradually become clear. Some typical energy storage battery technologies have been initially applied to many aspects such as power system ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M3/10H02J7/10H02J3/01H02M1/12
CPCY02E40/10Y02E40/40
Inventor 李建林徐少华谢志佳修晓青惠东
Owner CHINA ELECTRIC POWER RES INST
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