Voltage fluctuation restraining method for high-frequency zero-sequence voltage injection cascaded static synchronous compensator (STACOM)

A technology of zero-sequence voltage and fluctuation suppression, which is applied in the direction of AC network voltage adjustment, electrical components, circuit devices, etc.

Inactive Publication Date: 2015-01-14
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a chained star STATCOM capacitor voltage fluctuation suppression method that injects triple freque...

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  • Voltage fluctuation restraining method for high-frequency zero-sequence voltage injection cascaded static synchronous compensator (STACOM)
  • Voltage fluctuation restraining method for high-frequency zero-sequence voltage injection cascaded static synchronous compensator (STACOM)
  • Voltage fluctuation restraining method for high-frequency zero-sequence voltage injection cascaded static synchronous compensator (STACOM)

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Embodiment Construction

[0032] The high-frequency zero-sequence voltage injection chain-type STATCOM voltage fluctuation suppression method of the present invention has five steps in total, including: 1. Acquisition of grid voltage vector angle; 2. Compensation current detection and coordinate transformation; 3. Triple-frequency zero-sequence voltage Acquisition of amplitude; 4. Acquisition of triple frequency zero-sequence voltage phase angle; 5. Triple frequency zero-sequence voltage injection and PWM signal generation;

[0033] Step 1, the realization of the acquisition of the grid voltage vector angle:

[0034] Step 1.1 Sampling the three-phase grid voltage (e a 、e b 、e c ), transformed into a two-phase stationary coordinate system to obtain e α 、e β ;

[0035] Step 1.2 will e α 、e β and the grid voltage vector angle (θ), which are sent to the two-phase rotating coordinate transformation to obtain the two DC components of the grid voltage in the synchronous rotating coordinate system (e d...

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Abstract

The invention provides a voltage fluctuation restraining method for a high-frequency zero-sequence voltage injection cascaded static synchronous compensator (STACOM) and belongs to reactive compensation device control methods of power electronics. The method comprises the five steps that firstly, a power grid voltage vector angle is obtained, and synchronous rotation transformation among three kinds of signals such as power grid voltage, compensating currents and a modulating signal obtained according to a master control algorithm is achieved; secondly, compensating current detection and coordinate transformation are carried out, and a triple frequency zero-sequence voltage phase angle is obtained through calculation; thirdly, a triple frequency zero-sequence voltage amplitude is obtained through calculation; fourthly, the triple frequency zero-sequence voltage phase angle is obtained, and a final modulating signal is obtained by adding an instantaneous value to the modulating signal obtained according to the master control algorithm; fifthly, triple frequency zero-sequence voltage injection and PWM signal generation are carried out, three-phase PWM signals are generated, and STACOM capacitor voltage fluctuation restraining is completed. The capacitor voltage fluctuation frequency on the direct current side of the STACOM is converted into quadruplicated frequency from double frequency, the fluctuation amplitude is reduced by half, direct current voltage is stabilized, and the service life of a capacitor is prolonged.

Description

technical field [0001] The invention relates to a control method of a power electronic reactive power compensation device, in particular to a method for suppressing voltage fluctuation of a chain-type star-shaped STATCOM capacitor injected with triple frequency zero-sequence voltage. Background technique [0002] Static synchronous compensator (static synchronous compensator, STATCOM), as a new type of reactive power compensation device, has the advantages of good dynamic compensation effect, large compensation range and small footprint. The H-bridge cascaded chain topology can facilitate the realization of a modular structure, so that the number of output levels, device capacity, and withstand voltage level can be quickly adjusted according to the actual situation, and the redundancy of the device is increased. It has gradually become a STATCOM's preferred topology. Compared with the delta structure, the star structure has a better application prospect because the voltage ...

Claims

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Application Information

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IPC IPC(8): H02J3/12H02J3/18
CPCH02J3/1814Y02E40/10
Inventor 王颖杰伍小杰刘海媛左慧芳王文超柴玉硕唐建波闫浩浩韩雪龙
Owner CHINA UNIV OF MINING & TECH
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