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Device and method for compensating symmetrical voltages of power grid based on high-temperature superconducting energy storage

A high-temperature superconducting and voltage compensation technology, applied in the field of superconducting applications, can solve the problem of high cost of capacitors

Inactive Publication Date: 2011-09-14
CHINA ELECTRIC POWER RES INST +1
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  • Application Information

AI Technical Summary

Problems solved by technology

When large storage capacity is required to provide compensation voltage for long-term voltage dips, the cost of capacitors will be high

Method used

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  • Device and method for compensating symmetrical voltages of power grid based on high-temperature superconducting energy storage
  • Device and method for compensating symmetrical voltages of power grid based on high-temperature superconducting energy storage
  • Device and method for compensating symmetrical voltages of power grid based on high-temperature superconducting energy storage

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Embodiment Construction

[0057] figure 1 It is a schematic diagram of the control principle of the instantaneous voltage drop compensation strategy. In the figure, the signal sampling circuit is based on the voltage transient detection method. When a voltage drop fault occurs, the digital signal processor DSP immediately detects the voltage distortion, determines the compensation algorithm according to the type of distortion, and generates a compensation signal through the control algorithm. DSP uses amplitude calculation and phase-locking to obtain the voltage U of each phase of the system i (i=a, b, c) amplitude and phase, after dq transformation, U d with normal reference signal U dref For comparison, the d-axis voltage compensation component is obtained after PI adjustment. The d, q axis voltage components are subjected to dq inverse transformation, and the trigger pulse signal generated by the PWM circuit is sent to the power switch tube IGBT to drive the power regulator of the superconducting...

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Abstract

The invention relates to a device and method for dynamically compensating symmetrical voltages of a power grid based on high-temperature superconducting energy. The method is characterized in that a DSP (digital signal processor) chip TMS 320F2812 samples voltage, current and frequency characteristic parameters of a power grid side; all phase systems are formed into an independent three-phase system; and detected voltage dip signals are compared with normal voltages in real time so as to determine the compensating time that each phase is injected independently as well as the amplitude and the phase position of compensating voltages. A PWM (pulse width modulation) circuit generates drive signals which are supplied for a switching tube of a power regulator, thus realizing the full-digital control for energy of a superconducting energy storage system. The device and the method thereof are applied to quickly compensating three-phase symmetrical or asymmetrical dip faults which are generated in actual power grid voltages via the high-temperature superconducting energy storage system. According to the invention, a load voltage can return to a normal level in milliseconds, a no-voltage fluctuation, symmetrical and non-harmonic real-time control function is realized, and the power quality of the power grid and the power distribution reliability are improved.

Description

technical field [0001] The invention belongs to the technical field of superconducting applications, and in particular relates to a power grid asymmetrical voltage dynamic compensation device and method based on a high-temperature superconducting energy storage system. Background technique [0002] In the power distribution network or user end of the power system, once a short-circuit fault, switch operation, switching of a transformer or capacitor bank, etc., may cause an instantaneous voltage drop. Although the instantaneous voltage drop is an accidental transient voltage change with a short duration, it has a great impact on some sensitive electrical equipment. Faced with this situation, improving power quality plays an important role in the safe and economical operation of the power grid, ensuring the quality of industrial products and the normal conduct of scientific experiments, and reducing energy consumption. It is directly related to the overall benefits of the nati...

Claims

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Application Information

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IPC IPC(8): H02J3/28
CPCY02E40/67Y02E40/60
Inventor 诸嘉慧丘明张宏杰魏斌
Owner CHINA ELECTRIC POWER RES INST
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