Tap selection strategy of phase-shifting transformer secondary winding under unequal tap phase voltages

A technology of phase-shifting transformer and secondary winding, which is applied in the direction of AC network voltage adjustment, flexible AC transmission system, etc.

Inactive Publication Date: 2016-02-24
GRID POWER PLANNING & RES CENT OF GUANGDONG GRID POWER CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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At present, our country does not have a complete set of strategies for the sel

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  • Tap selection strategy of phase-shifting transformer secondary winding under unequal tap phase voltages
  • Tap selection strategy of phase-shifting transformer secondary winding under unequal tap phase voltages
  • Tap selection strategy of phase-shifting transformer secondary winding under unequal tap phase voltages

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Embodiment Construction

[0054] 1. The tap equalizes the phase voltage

[0055] If there are M taps in the secondary winding of each phase of the ST, and the M taps equally divide the phase voltage, then there are (M+1) output voltages in this phase. When M is equal to 1, the output point voltage position that can be compensated by combining ST through the tap setting is as follows: figure 2 shown. For different M values, the calculated number of voltage points N1 that can be compensated can be expressed as:

[0056] N 1 = 1 + Σ i = 1 M + 1 6 i - - - ( 1 )

[0057] Table 1 shows the relationship between the number of taps M and the number of voltage vectors N1 that can be compensated by the ST in the case of e...

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Abstract

The invention relates to a tap selection strategy of a phase-shifting transformer secondary winding under the unequal tap phase voltages. The unequal tap phase voltages refers to divide each phase voltage in a proportion of 1:1:1 ... (M+1), and the M refers to the number of taps of each secondary winding of a phase-shifting transformer; the selection strategy comprises steps that, S1, an unequal tap phase voltage output point distribution graph is drafted; S2, oc, od and of straight lines are drafted on the graph of the step S1; S3, the unequal tap phase voltage output point distribution graph is turned to a certain angle, and a ST commissioning voltage and PQ relation graph is drafted; S4, L1 and L2 straight lines in parallel with P and Q transverse and vertical axes are drafted; and S5, a target power area is set, a location position is analyzed by a control system when ST acts to a certain compensation voltage point, the next action strategy is carried out according to different positions, and a purpose that a compensation point is enabled to enter the target power area through the smallest tap switching times is realized. According to the tap selection strategy, the phase-shifting transformer secondary winding has large tap compensation capacity, high compensation precision is realized, selection is flexible, and a plurality of series compensation voltage outputs can be realized.

Description

technical field [0001] The present invention relates to a strategy for selecting taps of the secondary winding of a phase-shifting transformer, in particular to a strategy for selecting the taps of the secondary winding of a phase-shifting transformer ("Sen" Transformer) under the condition of unequal phase split voltage. Background technique [0002] Phase-shifting transformer is a key technology to realize power flow control in modern power system. Since the concept of the phase shifter was first proposed in the 1930s, the traditional phase shifter based on the mechanical on-load tap changer has been widely used in the world, especially in the power grids of European and American countries. The use of phase-shifting transformers can change the power flow distribution in the line, reduce losses, optimize the power flow distribution of the line, and improve the transmission capacity of the power grid. Therefore, the application requirements of phase-shifting transformers are...

Claims

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Application Information

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IPC IPC(8): H02J3/12
CPCY02E40/10
Inventor 余梦泽朱浩骏陈柏超田翠华袁佳歆费雯丽刘雷游奕弘
Owner GRID POWER PLANNING & RES CENT OF GUANGDONG GRID POWER CO LTD
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