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ZSC-SMES topological structure and AC/DC side control method thereof

A technology of topology structure and control method, which is applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., and can solve the problems of switch tube bridge arm straight-through, economic loss, dynamic response ability and poor robustness And other issues

Inactive Publication Date: 2019-04-26
CHENGDU POWER SUPPLY COMPANY OF STATE GRID SICHUAN ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the prior art, the power regulation system of SMES has high cost and poor anti-electromagnetic interference ability, and the switch tube may malfunction and cause the bridge arm to pass through, causing unnecessary economic losses; SMES The traditional AC side control strategy of the converter has poor dynamic response ability and robustness, and the large amount of calculation will make the control cycle longer and lose real-time performance; the traditional DC side control of the SMES converter is difficult to achieve superconducting magnets. Symmetrical and uniform voltage distribution at the ends affects the safe operation of the SMES

Method used

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Embodiment 1

[0089] like figure 1 As shown, a kind of ZSC-SMES topological structure of the present invention, comprises the AC side three-phase bridge circuit, Z source impedance network and chopper connected in sequence, the input end of described AC side three-phase bridge circuit is connected to three-phase grid;

[0090] The Z source impedance network includes a capacitor C1, a capacitor C2, an inductor L1, an inductor L2, and a switch tube S7. One end of the inductor L1, one end of the capacitor C1, and the positive output of the three-phase bridge circuit on the AC side share a node, and the inductor L1 The other end, the drain of the switch tube S7 and one end of the capacitor C2 share a node, one end of the inductor L2, the other end of the capacitor C2 and the output negative pole of the three-phase bridge circuit on the AC side share a node, the other end of the inductor L2, and the other end of the capacitor C1 One terminal has a common node with the output negative pole of the...

Embodiment 2

[0094]In this embodiment, on the basis of Embodiment 1, the AC-side three-phase bridge circuit adopts a three-phase inverter bridge circuit. The chopper includes a switching tube S8, a switching tube S9, a capacitor C3, an inductor Lsc, a diode D1, and a diode D2; one end of the capacitor C3, the drain of the switching tube S8, and the cathode of the diode D1 have a common node and serve as a chopper The output anode of the device is connected to the Z source impedance network, the other end of the capacitor C3, the anode of the diode D2 and the source of the switch tube S9 have a common node and are connected to the Z source impedance network as the output cathode of the chopper; the switch The source of the transistor S8, the cathode of the diode D2, and one end of the inductor Lsc share a node, and the other end of the inductor Lsc, the drain of the switching transistor S9, and the anode of the diode D1 share a node.

Embodiment 3

[0096] This embodiment is on the basis of embodiment 1 and embodiment 2, as figure 1 As shown, the topology of ZSC-SMES is as follows figure 1 As shown, it consists of an AC side ZSC and a DC side chopper. Among them, the ZSC is divided into two parts: the three-phase bridge on the AC side and the Z source impedance network. The bidirectional power flow on the AC and DC sides of the ZSC-SMES is controlled by the switching tube S in the Z source network. 7 state decision. In the figure, L g and R g Respectively represent the inductance value and resistance value of the grid side of the converter; L 1 , L 2 and C 1 、C 2 Respectively represent the inductance value and capacitance value in the Z source network; U dc Indicates the DC side voltage value; L sc Indicates the magnet inductance value; i sc is the magnitude of the magnet current; e a 、e b 、e c Respectively represent the three-phase sinusoidal grid voltage.

[0097] Through equal power conversion, the mathem...

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Abstract

The invention discloses a ZSC-SMES topological structure comprising an AC side three-phase bridge circuit, a Z source impedance network and a chopper connected in sequence. The input end of the AC side three-phase bridge circuit is connected to a three-phase power grid. The invention also discloses an AC / DC side control method. The Z source impedance network is introduced on the basis of a traditional VSC which enables the fault through state in the VSC to become the normal working state of the ZSC, so that the fault caused by the through state is avoided. A controller on the AC side of a converter is designed based on the passive theory, the dynamic response capability and the robustness of the system are improved through an energy shaping and damping injection method, and the output power quality of the converter is improved. Based on the dynamic evolution theory, the controller on the DC side of the converter is designed, so that the voltage at two ends of a magnet is evenly distributed, the operating state of the magnet is improved, and the system safe operation is guaranteed.

Description

technical field [0001] The invention relates to the technical field of electrical engineering, in particular to a ZSC-SMES topology structure and an AC / DC side control method thereof. Background technique [0002] In recent years, non-renewable resources have been gradually replaced by new energy with the characteristics of "fluctuation, intermittent, randomness". In order to improve the grid connection reliability of new energy power generation, the development of energy storage devices applied to new energy is a strategic technology for the sustainable development of national electric power. Superconducting magnetic energy storage system (SMES) system benefits from its extremely high power density and energy storage efficiency, and it is an inevitable trend in the future to be used as a new type of energy storage device in power systems. [0003] The power regulation system of SMES usually adopts the topology of voltage source converter (VSC), and VSC needs to cascade add...

Claims

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Application Information

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IPC IPC(8): H02M7/219
CPCH02M7/219
Inventor 林晓冬何大地
Owner CHENGDU POWER SUPPLY COMPANY OF STATE GRID SICHUAN ELECTRIC POWER
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