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Series capacitor compensating device capable of inhibiting sub-syuchronous resonance of electric network

A series capacitor compensation, subsynchronous resonance technology, applied in harmonic reduction devices, reactive power compensation, AC networks to reduce harmonics/ripples, etc., can solve the problem of reducing the stability of the power grid system, increasing the erection of transmission lines, and being expensive. and other problems, to achieve the effect of saving power investment, improving power transmission capacity and improving stability

Inactive Publication Date: 2003-08-27
ZHEJIANG UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, there are four ways to solve this bottleneck: 1. Increase the erection of transmission lines to improve the transmission capacity from the transmission end to the power receiving end. This method is costly, because the investment of a thousands of kilometers of high-voltage transmission lines is tens of billions Yuan
2. Connect fixed capacitance compensation devices in parallel or in series along the transmission line or at the power receiving terminal. This method can effectively reduce the influence of the inductive reactance of the transmission line, but it will greatly reduce the stability of the entire power grid system. Subsynchronous resonance between them, causing damage to the unit, or even grid collapse, etc.
But it's also expensive

Method used

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  • Series capacitor compensating device capable of inhibiting sub-syuchronous resonance of electric network
  • Series capacitor compensating device capable of inhibiting sub-syuchronous resonance of electric network
  • Series capacitor compensating device capable of inhibiting sub-syuchronous resonance of electric network

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Embodiment Construction

[0015] Such as figure 1 As shown, on the single transmission line between the first grid 1 and the second grid 2, one end of the primary winding of the transformer Tb is connected to the transmission line of the first grid after passing through the series compensation capacitor C1; the other end of the primary winding of the transformer Tb One end is connected to the transmission line of the second power grid; the resistor R is connected in parallel to both ends of the primary winding of the transformer Tb; the inductance coil L1 and another capacitor C2 are connected in series and connected to both ends of the secondary winding of the transformer Tb.

[0016] Such as figure 2 As shown, on the single transmission line between the first grid 1 and the second grid 2, one end of the primary winding of the transformer Tb is connected to the transmission line of the first grid after passing through the series compensation capacitor C1; the other end of the primary winding of the t...

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Abstract

The structure of the device is as follows. One end of the primary winding of the transformer through the cascaded compensation capacitance is connected to the transmission line of the first electric network; the other end of the primary winding of the transformer is connected to the transmission line of the second electric network. The resistance is connected to the two end of the primary winding or secondary winding of the transformer. The electric induction coil cascaded to the capacitance is parallel connected to the two ends of the secondary winding of the transformer. The invented device can restrain subsynchronous resonance on electric networks caused by series compensation and raise the compensating ratio to more than 90%. The invention increases transmission capacity, raises stability of entire electric networks as well as lowers the cost for operating equipment and electric networks.

Description

technical field [0001] The invention relates to a series capacitor compensation device capable of suppressing subsynchronous resonance of a grid. Background technique [0002] With the popularization and application of high-voltage long-distance AC transmission network, the inductive reactance of the transmission line has become the main factor limiting the transmission capacity of the line. At present, there are four ways to solve this bottleneck: 1. Increase the erection of transmission lines to improve the transmission capacity from the transmission end to the power receiving end. This method is costly, because the investment of a thousands of kilometers of high-voltage transmission lines is tens of billions Yuan. 2. Connect fixed capacitance compensation devices in parallel or in series along the transmission line or at the power receiving terminal. This method can effectively reduce the influence of the inductive reactance of the transmission ...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/30Y02E40/40
Inventor 吴卫民钱照明
Owner ZHEJIANG UNIV
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