CN203883485U

CN203883485U - Coupling-typed thyristor controlled series compensation (TCSC) device

Info

Publication number: CN203883485U
Application number: CN201420305299.7U
Authority: CN
Inventors: 贾继莹
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-06-10
Filing date: 2014-06-10
Publication date: 2014-10-15
Anticipated expiration: 2024-06-10

Abstract

The utility model provides a coupling-typed thyristor controlled series compensation (TCSC) device and aims to solve problems that all the circuit elements in TCSC need to bear a high voltage of an AC power transmission system and secondly many harmonic waves can be generated so that quality of electric energy cannot be ensured. A key point of the utility model is that the TCSC device includes a capacitor and a plurality of inductive circuits which are controlled by a thyristor. The inductive circuits which are controlled by the thyristor are connected to each other in parallel to form a thyristor-inductive circuit set. The capacitor is coupled to the thyristor-inductive circuit set through a transformer, namely, a high-voltage side of the transformer is connected to the two ends of the capacitor and a low-voltage side of the transformer is connected to the two ends of the thyristor-inductive circuit set. The device has following beneficial effects: a requirement on the thyristor is greatly reduced and cost of the device is reduced. Secondly, an inductance of the circuit is equalized according to the number of the employed inductor. Not only can a current load of a single thyristor be reduced but also an actually continuous adjustment of the inductance can be adjusted and the harmonic waves are eliminated.

Description

Manifold type controlled series compensation device

Technical field

The utility model relates to a kind of controllable serial capacitor compensation arrangement of AC transmission system.

Background technology

The controlled series compensation technology (TCSC) of AC transmission system is, inductance L 1 and capacitor C series resonance, on the capacitor C side of connecting, the inductance L 2 circuit KP(by bidirectional triode thyristor (lower same) control in parallel are referring to Fig. 1), thereby produce a controlled extra current being superimposed upon on capacitor, the control of realization to the outside equivalence capacitive reactance of series compensation capacitance, realizes the control to the smooth adjustment of series compensation capacitance and dynamic response by silicon controlled is triggered to control.This technology is feasible from principle, but have in actual applications and be much difficult to the difficulty that overcomes, first be, the all circuit elements of controlled series compensation all need to bear the high voltage of AC transmission system, this just needs large-scale insulated platform and high-end device, silicon controlled type selecting, assembling, triggering, cooling very difficult, and electromagnetic interference is large, can not reliability service, and cost is huge.Secondly owing to being the electric current of the inductor loop of thyristor operating angle control, be not that the inductance value based on real changes, can produce a lot of harmonic waves, the quality of power supply does not guarantee.

Summary of the invention

For solving the problems of the technologies described above, the purpose of this utility model is to provide a kind of manifold type controllable series compensator.

The purpose of this utility model is achieved in that it comprises electric capacity and by thyristor controlled inductive circuit, it is characterized in that: some compose in parallel controllable silicon-inductive circuit group by thyristor controlled inductive circuit, electric capacity and controllable silicon-inductive circuit group are by transformer coupled, be the two ends that electric capacity is received in the high-pressure side of transformer, step down side is received the two ends of controllable silicon-inductive circuit group.

Compared with prior art, good effect of the present utility model is: owing to using transformer being kept apart by thyristor controlled inductive circuit and main circuit, greatly reduce the grade of controllable silicon withstand voltage, and in parallel by thyristor controlled inductive circuit by some, make to greatly reduce by each silicon controlled electric current, and then greatly reduce silicon controlled requirement, reduced cost of the present utility model; Secondly, the utility model is adjusted equivalent inductance value and no longer by the silicon controlled angle of flow, is realized, but according to the inductance quantity dropping into, carrys out the inductance value of equivalent electric circuit.The inductance quantity dropping into is more, and controllable equivalent inductance value is just finer and closely woven, both can reduce single silicon controlled electric current burden, can realize again real continuous adjusting of inductance value, there is no harmonic wave, and control method is greatly simplified.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, further illustrate the utility model.

Fig. 1 is the electrical schematic diagram of controlled series compensation (TCSC) device.

Fig. 2 is electrical schematic diagram of the present utility model.

What Fig. 3 was that the utility model is applied to three-phase alternating current transmission system is schematic diagram.

Fig. 4 is the A phase enlarged drawing in Fig. 3.

Embodiment

Referring to Fig. 2, it comprises capacitor C and by thyristor controlled inductive circuit, some compose in parallel controllable silicon-inductive circuit group KP1, KP2 by thyristor controlled inductive circuit ... KPn, capacitor C and controllable silicon-inductive circuit group are coupled by transformer T, be the two ends that capacitor C is received in the high-pressure side of transformer, step down side is received the two ends of controllable silicon-inductive circuit group.

Referring to Fig. 3, the 10KV circuit of rated current 800A of take is example, and A, B and the every phase of C three-phase all connect identical manifold type controlled series compensation device, wherein L1 and C series resonance, and L1 is linear inductance 39mH; C is the capacitor group of 255 μ F, is placed on insulated platform.

Referring to Fig. 4, the high-pressure side 10KV of transformer T, low-pressure side 0.4KV; By thyristor controlled inductive circuit, be 625 KP1 ... KP625; The inductance L 21 of every thyristor controlled inductive circuit or L22 are 39mH linear inductance, 15A current capacity, and over-voltage protector of each inductance in parallel is as piezo-resistance, to discharge the dump energy in inductance; The controllable silicon of every thyristor controlled inductive circuit is to be composed in parallel by two controllable silicons, and one of them controllable silicon string has resistance, and this controllable silicon is used while being fault current limiting.

When the inductive load in circuit increases, need to drop into inductance to increase the capacitive reactance of limiter equivalence, inductance of every input has just roughly reduced 1/625 capacitance, fine and closely woven like this classification, can perfectly to building-out capacitor amount, adjust, and not produce harmonic wave.

When bus breaks down electric current, string can there be is the controllable silicon of resistance all open, at this moment, the inductance of equivalence is connected with equivalent resistance, is connected to electric capacity two ends, then connects with L1, because L1 and C also have through transformer coupled equivalent inductance of coming, be the numerical relation of resonance.At this moment the total impedance of circuit presents pure resistively, and its size is retrained by R.

Because compensation rate depends on the low-pressure side inductance quantity of input, whole control strategy is approximate and common the control of reactive power compensating strategy just, and the quantity just controlling is larger, and with present technology, this is not all a problem.

On high-tension side capacitor, inductance, the withstand voltage safeguard measure of transformer need be carried out routinely.

Claims

1. a manifold type controllable series compensator, it comprises electric capacity and by thyristor controlled inductive circuit, it is characterized in that: some compose in parallel controllable silicon-inductive circuit group by thyristor controlled inductive circuit, electric capacity and controllable silicon-inductive circuit group are by transformer coupled, be the two ends that electric capacity is received in the high-pressure side of transformer, step down side is received the two ends of controllable silicon-inductive circuit group.

2. according to manifold type controllable series compensator claimed in claim 1, it is characterized in that: piezo-resistance of each inductance in parallel of every thyristor controlled inductive circuit; The controllable silicon of every thyristor controlled inductive circuit is to be composed in parallel by two controllable silicons, one of them controllable silicon in serial connection resistance.