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System and method of improving VSG low-voltage ride-through capability based on magnetic flux coupling type SFCL

A low voltage ride through and magnetic flux coupling technology, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, usage of superconductor elements, electrical components, etc., can solve the problem of low voltage ride through and withstand transient current Weak ability to impact, etc.

Pending Publication Date: 2020-02-18
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For grid-connected inverters using the VSG control algorithm, their ability to withstand transient current impacts is quite weak, especially when a serious fault occurs in the grid, only hysteresis controllers, additional current loops for excitation states, and smooth switching are used to solve the problem. Therefore, it is necessary to improve the ability of VSG to connect to the grid during a fault, that is, the fault ride-through capability

Method used

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  • System and method of improving VSG low-voltage ride-through capability based on magnetic flux coupling type SFCL
  • System and method of improving VSG low-voltage ride-through capability based on magnetic flux coupling type SFCL
  • System and method of improving VSG low-voltage ride-through capability based on magnetic flux coupling type SFCL

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0076] Example 1: A three-phase metallic fault occurs in the virtual synchronous generator VSG at t=1s, and the fault duration is 200ms. The resistance R of the superconducting coil of non-flux-coupled SFCL and flux-coupled SFCL SC When it is set to 0.5Ω, 1.0Ω, and 2.0Ω, the short-circuit current of each phase of the virtual synchronous generator VSG is simulated. The A-phase, B-phase and C-phase short-circuit currents of the virtual synchronous generator VSG shown in Fig. 5(a), Fig. 5(b) and Fig. 5(c) are obtained.

example 2

[0077]Example 2: The virtual synchronous generator VSG has a three-phase metallic fault at t=1s, and the fault lasts for 200ms. The resistance R of the superconducting coil of non-flux-coupled SFCL and flux-coupled SFCL SC When it is set to 0.5Ω, 1.0Ω, and 2.0Ω, the active power output of the virtual synchronous generator VSG is simulated, and the transient behavior of the virtual synchronous generator VSG shown in Figure 6(a) is obtained. The frequency of virtual synchronous generator VSG is simulated, and the transient behavior of virtual synchronous generator VSG shown in Fig. 6(b) is obtained.

example 3

[0078] Example 3: The virtual synchronous generator VSG has a three-phase metallic fault at t=1s, and the fault lasts for 200ms. The three-phase voltage of the virtual synchronous generator VSG is simulated respectively when there is no magnetic flux coupling SFCL, and the three-phase voltage of the virtual synchronous generator VSG shown in Fig. 7(a) is obtained.

[0079] The resistance R of the flux-coupled SFCL superconducting coil SC When it is set to 2.0Ω, the three-phase voltage of the virtual synchronous generator VSG is simulated, and the three-phase voltage of the virtual synchronous generator VSG shown in Figure 7(b) is obtained.

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Abstract

The invention relates to a power system automation technology and particularly relates to a system for improving the VSG low-voltage ride-through capability based on the magnetic flux coupling type SFCL, which comprises an alternating-current power grid, a virtual synchronous generator VSG, wherein a magnetic flux coupling type SFCL is installed at a public coupling point PCC between the virtual synchronous generator VSG and the alternating-current power grid. When the system has a serious power grid fault, the magnetic flux coupling type SFCL is used for limiting the fault current of the virtual synchronous generator VSG, improving the voltage sag of the virtual synchronous generator VSG, increasing the output of the active power of the virtual synchronous generator VSG, reducing the frequency fluctuation of the virtual synchronous generator VSG and improving the robustness of the virtual synchronous generator VSG. According to the method of improving the VSG low-voltage ride-throughcapability based on the magnetic flux coupling type SFCL, fault current can be limited under symmetrical fault and unsymmetrical fault, voltage sag can be suppressed, output of active power can be increased, frequency fluctuation can be reduced, and efficient LVRT operation of the VSG can be realized.

Description

technical field [0001] The invention belongs to the technical field of electric power system automation, and in particular relates to a system and a method for improving the low-voltage ride-through capability of a VSG based on a magnetic flux coupling SFCL. Background technique [0002] Wind power, photovoltaic and other new energy power generation are often connected to the power grid through power electronic interfaces, which poses challenges to the stable operation of the power grid. Virtual synchronous generator technology draws on the operating experience of traditional power systems. The control interface inverter has the operating characteristics of synchronous generators, which can overcome the shortcomings of low inertia and no damping of power electronic equipment, and improve the ability of the grid to accommodate new power sources. It is of great significance to promote the construction of smart grid. [0003] As a new type of inverter control technology, the h...

Claims

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Application Information

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IPC IPC(8): H02J3/48H02J3/40H02J3/38H02J3/24H02H9/02
CPCH02J3/48H02J3/40H02J3/24H02H9/023Y02E40/60
Inventor 陈磊李国城胡睿哲陈红坤田昕
Owner WUHAN UNIV
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