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A distributed power supply high voltage direct current access system and its control method

A distributed power supply, high-voltage DC technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, electrical components, etc. and other problems, to achieve the effect of strong fault tolerance and scalability, easy implementation and high degree of modularity

Active Publication Date: 2019-01-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above structure, there are two key issues that need to be solved: (1) the series voltage equalization problem on the high-voltage DC output side; (2) the independent control problem of the distributed power supply
However, so far, no effective solution to this problem has been found in the open technical information

Method used

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  • A distributed power supply high voltage direct current access system and its control method
  • A distributed power supply high voltage direct current access system and its control method
  • A distributed power supply high voltage direct current access system and its control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0031] Implementation mode 1: An integrated three-port DC converter is used to provide input ports, output ports and bidirectional ports at the same time. The schematic diagram of the structure is as attached figure 2 Shown. In the specific implementation, there are many types of circuit topologies available for three-port DC converters, such as the literature "Hongfei Wu, Junjun Zhang, Xiaoqing Qin, Tiantian Mu, YanXing. Secondary-Side-Regulated Soft-Switching Full-Bridge Three-Port ConverterBased on Bridgeless Boost Rectifier and Bidirectional Converter For MultipleEnergy Interface. IEEE Transactions on Power Electronics, vol.31, no.7, pp.4847-4860, July 2016. "All kinds of three-port DC converter circuit topologies, And the literature "Hongfei Wu, Runruo Chen, Junjun Zhang, Yan Xing, Haibing Hu, Hongjuan Ge. A family of Three-Port Half-Bridge Converters for a Stand-Alone Renewable Power System. IEEETransactions on Power Electronics, vol. 26, no .9, pp. 2697-2706, Sept. 2011...

Embodiment approach 2

[0032] Embodiment 2: A combination of a non-isolated converter and an isolated converter is used to provide input ports, output ports and bidirectional ports, where the input of the non-isolated converter is used as the input port of the three-port power conversion sub-module, and the output of the non-isolated converter is connected to Isolate the input of the converter, and use the output of the non-isolated converter and the input of the isolated converter as the bidirectional port of the three-port power conversion sub-module, and the output of the isolated converter as the output port of the three-port power conversion sub-module. The schematic diagram of the second embodiment is attached image 3 Shown. In specific implementation, any non-isolated DC converter and isolated DC converter can be used to construct a three-port power conversion sub-module. For example, the non-isolated converter uses the Boost converter, and the isolated converter uses the LLC resonant convert...

Embodiment approach 3

[0033] Embodiment 3: Two isolation converters are combined to provide input ports, output ports, and bidirectional ports. The input of one isolation converter is used as the input port of the three-port power conversion sub-module, and the output of the isolation converter is connected to the other The input of the isolation converter is used as the bidirectional port of the three-port power conversion sub-module, and the output of the other isolation converter is used as the output port of the three-port power conversion sub-module. The schematic diagram of the third embodiment is attached Figure 4 Shown. In specific implementation, any isolated DC converter can be used to construct a three-port power conversion sub-module, and the circuit topologies of the two isolated DC converters can be the same or different. For example, both isolated converters use LLC resonant converters.

[0034] The control of each three-port power conversion sub-module in the distributed power high-v...

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Abstract

The invention discloses a high-voltage direct current access system of a distributed power supply and a control method of the high-voltage direct current access system. The high-voltage direct current access system of the distributed power supply comprises N three-port power conversion sub-modules, wherein N is an natural number more than 1, each three-port power conversion sub-module comprises an input port, an output port and a bidirectional port, the input port of each three-port power conversion sub-module is connected with an independent direct current power supply, the bidirectional ports are connected in parallel, the output ports are sequentially connected in series, the input ports of the N three-port power conversion sub-modules are respectively and independently controlled to adjust input power of each direct current power supply, the voltage of the bidirectional port of each three-port power conversion sub-module is in direct proportion to the voltage of the output port thereof all the time, and thus, the stability of the voltage of the bidirectional port of each three-port power conversion module and voltage sharing control of the voltage of the output port are automatically achieved. The control method is simple and reliable, is liable to expand and is particularly suitable for application occasions such as medium- and high-voltage direct current grid connection.

Description

Technical field [0001] The invention relates to a DC power supply system, in particular to a distributed power supply high-voltage DC access system and a control method thereof, and belongs to the field of power electronic conversion and DC power supply systems. Background technique [0002] With the intensification of energy crisis and environmental pollution, distributed new energy generation such as photovoltaics and wind power have received more and more attention. At present, new energy power generation is usually connected to the large AC power grid, but because the output of new energy power generation devices such as photovoltaics is DC and the voltage is low, in order to integrate its output power into the large AC power grid, multiple power conversion links and bulky transformers are required. . In recent years, DC technology has been more and more widely used in all aspects of power conversion such as power generation, transmission, distribution, and power consumption...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353H02M3/33561
Inventor 吴红飞陆杨军董晓锋孙凯邢岩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS