Bidirectional energy storage converter

A technology of energy storage converters and inverters, which is applied in the field of power transmission and transformation, and can solve the problems of low output voltage control accuracy

Inactive Publication Date: 2018-11-23
QINGDAO TELD NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

EPS usually uses contactor switching, and the switching time is about 0.1-0.25s, which is much longer than UPS, and the output voltage control accuracy of EPS is low

Method used

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Examples

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Embodiment 1

[0025] As a preferred embodiment of the application, refer to the attached figure 1 and 2 , this example discloses:

[0026] A bidirectional energy storage converter, characterized in that it includes several DC buck-boost units, a three-phase inverter bridge circuit, a controller, an adapter, an AC filter circuit, an isolation transformer and an AC EMI filter, the AC The EMI filter is connected to the AC busbar, and the AC busbar is connected to the power grid through the AC circuit breaker; the high-voltage side of the isolation transformer is connected to the AC EMI filter; the low-voltage side of the isolation transformer is connected to the AC output side of the three-phase bridge inverter through the AC filter circuit. And the AC input end of the adapter; the AC power on the grid side enters the isolation transformer for transformation after passing through the AC circuit breaker and the AC EMI filter, and the transformed AC power is connected to the AC output end of th...

Embodiment 2

[0028] As another preferred embodiment of the present application, refer to the attached figure 1 and 2 , this example discloses:

[0029] A bidirectional energy storage converter, characterized in that it includes several DC buck-boost units, a three-phase inverter bridge circuit, a controller, an adapter, an AC filter circuit, an isolation transformer and an AC EMI filter, the AC The EMI filter is connected to the AC busbar, and the AC busbar is connected to the power grid through the AC circuit breaker; the high-voltage side of the isolation transformer is connected to the AC EMI filter; the low-voltage side of the isolation transformer is connected to the AC output side of the three-phase bridge inverter through the AC filter circuit. And the AC input end of the adapter; the AC power on the grid side enters the isolation transformer for transformation after passing through the AC circuit breaker and the AC EMI filter, and the transformed AC power is connected to the AC outp...

Embodiment 3

[0031] As another preferred embodiment of the present application, refer to the attached figure 1 and 2 , this example discloses:

[0032] A bidirectional energy storage converter, characterized in that it includes several DC buck-boost units, a three-phase inverter bridge circuit, a controller, an adapter, an AC filter circuit, an isolation transformer and an AC EMI filter, the AC The EMI filter is connected to the AC busbar, and the AC busbar is connected to the power grid through the AC circuit breaker; the high-voltage side of the isolation transformer is connected to the AC EMI filter; the low-voltage side of the isolation transformer is connected to the AC output side of the three-phase bridge inverter through the AC filter circuit. And the AC input end of the adapter; the AC power on the grid side enters the isolation transformer for transformation after passing through the AC circuit breaker and the AC EMI filter, and the transformed AC power is connected to the AC ou...

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PUM

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Abstract

The invention discloses a bidirectional energy storage converter, and relates to the technical field of power transmission and transformation. The bidirectional energy storage converter comprises a plurality of DC boost-buck units, a three-phase inversion bridge circuit, a controller, an adaptor, an AC filtering circuit, an isolation transformer and an AC EMI filter, wherein the AC EMI filter is connected with an AC bus, the AC bus is connected with a power grid by an AC circuit breaker, a high-voltage end of the isolation transformer is connected with the AC EMI filter, a low-voltage end of the isolation transformer is connected with an AC output end of the three-phase bridge inverter and an AC input end of the adaptor, a DC input end of the three-phase bridge inverter is connected with the DC boost-buck units, and a sampling signal input end of the controller is connected with a DC input end/AC output end of the three-phase bridge inverter and a DC output end/AC input end of the adaptor. By the bidirectional energy storage converter, bidirectional energy flowing of the AC system and the DC system can be achieved, multi-path DC inputs of multiple paths of different types of DC power supplies also can be achieved, peak clipping and valley filling of a power grid load can be achieved, and the bidirectional energy storage converter also has the functions of emergency power supply, reactive power compensation, electric energy quality control and the like.

Description

technical field [0001] The invention relates to the technical field of power transmission and transformation, and more specifically relates to a bidirectional energy storage converter. Background technique [0002] Because electric energy is difficult to store, in traditional electric power production, power generation, transmission, distribution, and power consumption are carried out almost simultaneously, and the power grid ensures the real-time balance of electric energy through dispatching means. However, under the background of large-scale access to new energy and large-scale development of micro-grids in today's world, due to the instability and discontinuity of the output power of new energy generation, it is easy to cause an imbalance between power supply and demand, which will not only affect power quality, but also cause frequency And the voltage is unstable, and in serious cases, it will cause a power outage, which will bring inconvenience to production and life. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/38
CPCH02J3/32H02J3/38H02J3/388
Inventor 左涛黎军华田杰涛吴晓林
Owner QINGDAO TELD NEW ENERGY TECH CO LTD
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