Control method of using STATCOM to improve HVDC alternating current filter switching performance

An AC filter and performance technology, applied in flexible AC transmission systems, AC network voltage adjustment, reactive power compensation, etc., can solve the problems of reducing equipment service life, frequent switching of AC filters, and sudden voltage changes.

Inactive Publication Date: 2017-08-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0003] During the operation of the HVDC system, the transmission power often changes, causing frequent switching of the AC filter, reducing the service life of the equipment, causing harmonic impact on the system, and causing system oscillation
Moreover, the filter itself is a discrete reactive power compensation device, which will cause a step change in reactive power during switching, causing a sudden change in voltage and adding additional stress to the device, which is detrimental to the safety of the device and the system.
[0004] In actual engineering, the coordination mechanism between STATCOM and AC filter is relatively simple, and the problem of voltage fluctuation at the moment of switching of AC filter has not been solved

Method used

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  • Control method of using STATCOM to improve HVDC alternating current filter switching performance
  • Control method of using STATCOM to improve HVDC alternating current filter switching performance
  • Control method of using STATCOM to improve HVDC alternating current filter switching performance

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Embodiment Construction

[0016] The specific implementation manner of the present invention will now be described in detail with reference to the drawings and examples, but the present invention is not limited by the described examples.

[0017] Proceed as follows:

[0018] 1) Taking a ±800kV DC transmission project in China as an example, build a HVDC transmission model including STATCOM, such as figure 1 shown;

[0019] 2) Set the action dead zone and hysteresis range of the AC filter to a total of 210Mvar, and incorporate STATCOM into the AC filter control strategy;

[0020] 3) When the reactive power of the system changes, the STATCOM acts first to suppress voltage fluctuations and reduce the number of operations of the conventional reactive power compensation device; and when the reactive power of the system changes beyond a certain value within the STATCOM compensation range, the filter acts to make the STATCOM more effective. Sufficient compensation capacity to deal with the next reactive pow...

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Abstract

During a cooperation process of a high-voltage direct-current power-transmission alternating current filter and a static synchronous compensator, a voltage fluctuation problem during alternating current filter switching is not solved. The invention provides an additional coordination control strategy of a STATCOM adaptive variable reactive current instruction value. Simultaneously, a variable parameter PI is used to control an idea optimization control characteristic so as to improve transient voltage fluctuation and restrain frequent switching of the alternating current filter, and then a purpose of improving direct current power transmission system operation performance is reached.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current transmission, and specifically relates to a method for using a static synchronous compensator (STATCOM) and an AC filter for coordinated control to improve frequent switching of the AC filter and voltage fluctuation during the switching process. Background technique [0002] High-voltage direct current transmission (HVDC) has become the first choice for long-distance and high-power transmission due to its advantages of large transmission capacity, low line cost, no stability limit, and asynchronous networking. It has made important contributions to solving the problem of uneven energy and load distribution in my country contribute. [0003] During the operation of the HVDC system, the transmission power often changes, causing frequent switching of the AC filter, reducing the service life of the equipment, causing harmonic impact on the system, and causing system oscillation. Moreover, th...

Claims

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Application Information

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IPC IPC(8): H02J3/16
CPCH02J3/16Y02E40/10Y02E40/30
Inventor 高本锋毛亚鹏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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