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Method for compensating dynamic three-phase imbalance load and compensator

A technology for balancing loads and compensating devices, which is applied in the direction of reducing the asymmetry of polyphase networks, eliminating/reducing asymmetry in polyphase networks, etc., and can solve the problem of no compensation method being proposed.

Inactive Publication Date: 2003-10-22
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

They can be implemented with the same compensator as shown in Fig. 1, but a digitally practical compensation method has not been proposed in the literature

Method used

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  • Method for compensating dynamic three-phase imbalance load and compensator
  • Method for compensating dynamic three-phase imbalance load and compensator
  • Method for compensating dynamic three-phase imbalance load and compensator

Examples

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specific Embodiment approach

[0110] The circuit of the calculation example is shown in Figure 9. Assuming that the load is an electric arc furnace, in a certain state, the three-phase admittances are: Y ab = - j 1 2 , Y bc = 1 2 - j 1 2 , Y ca = 3 2 - j 1 2 .

[0111] The line voltage of the system is: E . ab = 1 , E . bc = - 1 2 - j 3 ...

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Abstract

A method for compensating dynamic three-phase unbalanced loadsand and its device characterizing in sampling values of line voltage and load line current of two sample points at the connecting place of the compensation device and the system to compute related sine signal basic wave symmetric component, then to calculate positive and negative sequential compensator threephase equal susceptance, thesum of which is the three-phase susceptance value for compensating load unbalance and providing reactive current for the load, the susceptance reference value to be converted to a control angle signal and an order of the thyristor switched capacitor to be sent to the pulse generation plate and the condenser zero-cross trigger plate for controlling two devices.

Description

technical field [0001] A method and a compensation device for compensating dynamic three-phase unbalanced loads belong to the technical field of unbalanced load compensation in power systems. Background technique [0002] In the power transmission and distribution system, it is necessary to compensate the imbalance of the dynamic load, eliminate the harmful negative sequence current caused by the unbalanced load in the system; at the same time, quickly compensate the reactive power required by the load, improve the system power factor, and reduce the voltage fluctuation. The first key is that the controller must be able to quickly and accurately calculate the fundamental symmetrical component of the load current, and the second key is to propose a computer-implemented method for effective compensation based on this. [0003] Borrowing the principle of sequence component filter and phasor recognizer, and using computer software to realize it, it is a widely used digital meth...

Claims

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Application Information

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IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 逯帅张海波刘秀成陈建业王赞基赵广
Owner TSINGHUA UNIV
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