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Two-way power controller for superconducting energy-storage

A technology of power controller and superconducting energy storage, which is applied in the field of superconducting applications, can solve the problems of reduced efficiency, severe fluctuation of DC voltage and low switching frequency, etc., and achieve the effects of high working efficiency, simple control and low frequency

Active Publication Date: 2007-09-12
STATE GRID ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low switching frequency of the existing bidirectional chopper, the voltage fluctuation on the DC voltage side is severe, and other complicated voltage stabilization devices must be used to solve the problem, which makes the circuit structure very complicated and the efficiency is greatly reduced.
At the same time, the above reasons also limit the realization of higher power superconducting energy storage systems
At present, bidirectional choppers have been applied in small superconducting energy storage devices, but the application effect is not ideal

Method used

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  • Two-way power controller for superconducting energy-storage
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Embodiment Construction

[0020] The present invention will be further described below with reference to the accompanying drawings and in conjunction with three embodiments.

[0021] Embodiment 1 shown in Figure 4 is a 100KW / 1000A low-power bidirectional power controller for superconducting energy storage, which consists of a two-level three-phase voltage source inverter INV, a three-phase power frequency transformer ( The frequency is 50Hz or 60Hz) Tr and a three-phase common-cathode thyristor half-bridge converter SCR. Among them, the INV output line voltage of the two-level three-phase voltage source inverter is 400V, and the output phase current is 150A. Power frequency transformer Tr is D / Y 0 Connected 100KVA three-phase transformer. The output DC voltage of the three-phase common-cathode thyristor half-bridge converter SCR is 100V (-100V during inverter), and the output current is 1000A. In the figure, C is a DC capacitor, and Lsc is a superconducting energy storage inductance.

[0022] Embod...

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Abstract

The bidirectional power controller used in the superconducting energy storage is composed of power inverter, low frequency transformer and thyristor converter. The dc side of the power inverter connects with dc side of the power transformation installation used in the electric control of the superconducting energy storage system and its ac side connects with the original boarder of the low frequency transformer. The sub boarder of the low frequency transformer connects with the ac side of the thyristor converter and the dc side of the thyristor converter connects with the superconducting energy storage inductance. Adopting the bidirectional power controller of the invention can realize the control to the superconducting energy storage system with large power and reaches the ideal direct voltage stability, without adding extra voltage stabilizer. It is featured by simple circuit structure and high efficiency.

Description

technical field [0001] The invention relates to a bidirectional power controller for superconducting energy storage, belonging to the technical field of superconducting applications. Background technique [0002] With the discovery of high-temperature superconducting materials and the rapid development of power electronics technology, superconducting energy storage (SMES) devices are increasingly used in power systems. Superconducting energy storage devices can not only be used to balance loads and increase the transmission power limit of transmission lines, but also improve power system stability, suppress grid frequency and voltage fluctuations, reduce subsynchronous oscillations of generators, and shorten fault recovery time, etc. . The power control device used in SMES is an energy exchange device between the superconducting coil and the power grid. It is connected to the power grid through a transformer, and it can independently control the exchange of active power and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J15/00
CPCY02E40/67Y02E40/60
Inventor 王彤
Owner STATE GRID ELECTRIC POWER RES INST
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