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A processing method for synchronous zero-crossing of line current

A line current and processing method technology, applied in the field of power systems, can solve problems such as unseen processing methods, and achieve the effect of clear thinking, small amount of calculation, and good stability

Active Publication Date: 2011-12-28
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of generating trigger pulses based on the control of zero-crossing points has not seen the same or similar processing methods for the problem of synchronous zero-crossing of line current at home and abroad.

Method used

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  • A processing method for synchronous zero-crossing of line current
  • A processing method for synchronous zero-crossing of line current
  • A processing method for synchronous zero-crossing of line current

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Embodiment Construction

[0042] 1. Synchronous zero-crossing processing method

[0043] The synchronization trigger pulse is generated by controlling the zero crossing point. figure 1 C+0, C+1, C+2, C+3, C+4, C+5, C+6, C+7 are control zero crossing points, M+0, M+1, M+2, M+3, M+4, M+5, M+6, M+7 are measured zero-crossing points, or called actual zero-crossing points.

[0044] The new control zero-crossing point C+1 is calculated on the basis of the previous control zero-crossing point C+0, that is, the time difference between the two is T+ΔT, such as figure 2 shown.

[0045] 2. Calculate the average interval time T of measuring the zero crossing point

[0046] T is defined as the average interval time of measuring zero crossings, which is used to simulate the frequency of the power system. First, according to the measured zero-crossing points M+0, M+1, M+2, M+3, etc., the interval time of measuring zero-crossing points can be calculated, such as image 3 T in M1 , T M2 and T M3 Wait.

[0047...

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Abstract

The invention provides a line current synchronous zero-crossing processing algorithm and introduces a concept of control zero-crossing point which is set as a thyristor trigger benchmark for a compensating device of a thyristor control series capacitor. When the control zero-crossing point is adopted to generate synchronized trigger pulses, a new control zero-crossing point is determined by calculating on the basis of the former control zero-crossing point. The processing algorithm can be used for solving the line current synchronous zero-crossing problem of the compensating device of the thyristor control series capacitor (TCSC); and the processing algorithm also can be applied to other devices requiring zero-crossing processing of line current or line voltage, such as static synchronous series compensators (SSSC), unified power flow controllers (UPFC), active power filters (APF) and the like.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a line current synchronous zero-crossing processing method for a thyristor-controlled series capacitor compensation device (TCSC), which is used in a static synchronous series compensator (SSSC), unified power flow controller (UPFC), active This method can also be used when the power filter (APF) and the like need to perform zero-crossing processing of the line current or line voltage. Background technique [0002] When triggering the thyristors of the thyristor-controlled series compensation device, the actual zero-crossing point of the line current or the zero-crossing point of the fundamental wave component of the line current can be selected as a reference, see the following references [1]-[2]. The method of generating trigger pulses based on the control of zero-crossing points has not seen the same or similar processing methods in the processing of synchronous zero-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18H02J3/00
CPCY02E40/40Y02E40/10Y02E40/22Y02E40/14Y02E40/18Y02E40/20
Inventor 武守远戴朝波王宇红吉平
Owner CHINA ELECTRIC POWER RES INST