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Wide-voltage-gain DC/DC converter for energy storage device

A technology of energy storage device and converter, which is applied in the direction of conversion equipment without intermediate conversion to AC, and can solve the problems of increasing switching loss, electromagnetic interference, and large voltage stress

Inactive Publication Date: 2020-05-22
TIANJIN UNIV MARINE TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional isolated bidirectional DC / DC converters are easy to achieve a wide voltage gain range. However, due to the leakage inductance of the transformer, it will generate a large voltage stress, which increases switching losses and electromagnetic interference.

Method used

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  • Wide-voltage-gain DC/DC converter for energy storage device
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  • Wide-voltage-gain DC/DC converter for energy storage device

Examples

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Embodiment 1

[0028] 1. Topology

[0029] Such as image 3 Bidirectional DC / DC converter with wide voltage gain shown. The low-voltage side of the DC / DC converter is connected to the energy storage device; the high-voltage side is connected to the DC bus; the main part of the converter is composed of two traditional buck / boost converters, the first of which is as follows figure 2 shown by the inductance L 1 , power switch Q 1 , Q 3 and capacitance C 1 constitute. another such as figure 1 shown by the inductance L 2 , power switch Q 2 , Q 4 and Q 5 and capacitance C 2 and C 3 constitute. The two form a new type of bidirectional DC converter through the parallel connection of the low-voltage side and the series connection of the high-voltage side.

[0030] 2. Wide voltage gain

[0031] The present invention is divided into a boost mode and a buck mode. In the boost mode, the energy storage device provides energy for the DC bus, and the energy flows from the low volta...

Embodiment 2

[0061] Below to image 3 The novel wide voltage gain bidirectional DC / DC converter topology shown, Figure 4 , 5 , the topological equivalent circuit diagram of 7, 8 and Figure 6 and Figure 9 Important working waveforms when the topology is running stably, the principle of the scheme in the first embodiment will be described. The bidirectional is divided into boost and buck modes, and for each mode, the converter experiences two switching states in one carrier period. The two switch states in the boost mode and the buck mode are described respectively below.

[0062] boost mode

[0063] when S 1 S 2 =11, the equivalent circuit of this state is as Figure 4 As shown, the power switch tube Q 1 , Q 2 conduction, Q 3 , Q 5 anti-parallel diode reverse cut-off, Q 4 Antiparallel diodes conduct forward, according to Figure 6 Topological working waveform, low side power supply U low To inductance L 1 charging, in addition the low side power U low and C ...

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Abstract

The invention discloses a wide-voltage-gain DC / DC converter for an energy storage device. The low-voltage side of the DC / DC converter is connected with an energy storage device, the high-voltage sideof the DC / DC converter is connected with a direct-current bus, a converter body is composed of two buck / boost converters, and the first converter is composed of an inductor L1, a power switch Q1, a power switch Q3 and a capacitor C1. The other one is composed of an inductor L2, power switches Q2, Q4 and Q5, and capacitors C2 and C3. The two are integrated into a novel bidirectional direct-currentconverter through low-voltage side parallel connection and high-voltage side series connection. According to the invention, the voltage gain range is broadened, and the voltage stress of the power device and the capacitor is reduced, so that the wide-voltage-gain DC / DC converter is more suitable for occasions of voltage conversion and bidirectional energy flow of the energy storage device.

Description

technical field [0001] The invention belongs to the technical field of power electronic power conversion, and in particular relates to a novel wide voltage gain DC / DC converter suitable for an energy storage device, which belongs to the application occasion of two-way exchange of energy storage device and DC bus power. Background technique [0002] With the depletion of fossil energy and the destruction of the natural environment, renewable energy has attracted widespread attention due to its advantages of sustainable utilization, cleanliness and low pollution. It is an effective way to alleviate the energy crisis and environmental pollution. However, renewable energy represented by wind energy and solar energy is discontinuous, unstable, intermittent, and changes with time and climate change. With the increasing proportion of power generation equipment capacity of such renewable energy in DC microgrid , and its negative impact on the microgrid is becoming more and more obvi...

Claims

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Application Information

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IPC IPC(8): H02M3/07
CPCH02M3/07
Inventor 王萍王智爽毕华坤杨瑞福谢思宇
Owner TIANJIN UNIV MARINE TECH RES INST
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