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Multi-microgrid flexible direct current interconnection system containing switch array

A switch array and flexible DC technology, applied in the direction of AC and DC network circuit layout, AC network circuit, power transmission AC network, etc., can solve the problems of complex control methods of converters, excess power loss, etc., and achieve simple and easy power flow direction , smoothing fluctuations and mitigating effects

Pending Publication Date: 2020-01-17
TIANJIN UNIV
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Problems solved by technology

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a method that does not pass through any power electronic device, and does not have problems such as complicated converter control methods and excess power loss caused by grid-connected modes of other multi-microgrid systems.

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  • Multi-microgrid flexible direct current interconnection system containing switch array

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and the specific implementation process.

[0021] The multi-microgrid flexible DC interconnection structure containing switch arrays of the present invention solves the impact of multi-microgrids on the distribution network through AC direct grid connection. The output load power is directly connected to the distribution network through the switch array, and is directly supplied by the distribution network. The distributed power supply and the distribution network are not on the same AC bus, so the change of the distributed power supply voltage frequency due to the randomness and volatility of renewable energy will not affect the distribution network at all, while the distribution network and the target load directly connected.

[0022] Such as figure 1 As shown, this example includes: AC circuit breaker 1, first AC bus 2, second AC bus 3, common DC bus 4, ene...

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Abstract

The invention relates to a multi-microgrid flexible direct-current interconnection system containing a switch array, which comprises an alternating-current circuit breaker, a first alternating-currentbus, a second alternating-current bus, a common direct-current bus, an energy pool, the switch array, a modular multilevel converter (VSC) and a boost-buck chopper, and is characterized in that a power distribution network is connected with the second alternating-current bus through the alternating-current circuit breaker; three ports of the switch array are respectively connected with the firstalternating current bus, the second alternating current bus and a load; the first alternating current bus is connected with a distributed power supply in the microgrid and a VSC alternating current side for flexible direct current interconnection through the VSC; the direct current side of the modular multilevel converter VSC of each microgrid is connected to the common direct current bus; the energy pool is connected to the common direct current bus through the boost-buck chopper to maintain the voltage stability of the common direct current bus.

Description

technical field [0001] The invention relates to the field of microgrid technology and power electronics technology in power systems, and in particular to a multi-microgrid flexible interconnection structure composed of power electronic devices and switch arrays. Background technique [0002] Multi-microgrid is a small power system with links of power generation, power distribution and power consumption. It can provide support for the distribution network when necessary. When the distribution network fails, it can provide restoration services to ensure the power supply of important non-faulty areas. . As a cluster system composed of several microgrids, distributed power sources, energy storage units and various loads, the structure of the multi-microgrid system will directly affect the overall operation stability and control flexibility of the system, and indirectly affect its supply voltage. , frequency support and the ability to cut peaks and fill valleys. [0003] In the...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/00H02J4/00
CPCH02J3/36H02J4/00Y02E60/60
Inventor 刘迎澍陈曦
Owner TIANJIN UNIV
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