CN104037784A

CN104037784A - Coupled thyristor controlled serial compensation device

Info

Publication number: CN104037784A
Application number: CN201410254035.8A
Authority: CN
Inventors: 贾继莹
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-06-10
Filing date: 2014-06-10
Publication date: 2014-09-10

Abstract

The invention provides a coupled thyristor control serial compensation device. The coupled thyristor controlled serial compensation device solves the problem all the thyristor controlled circuit elements need to bear the high voltage of an AC (alternate current) power transmission system and meanwhile can generate a large amount of harmonic waves and accordingly cannot guarantee power quality. The coupled thyristor control serial compensation device is characterized by comprising a capacitor and thyristor controlled inductance circuits; a plurality of the thyristor controlled inductance circuits are connected in series to compose a thyristor-inductance circuit group; the capacitor and the thyristor-inductance circuit group are coupled through a transformer, namely, the high-pressure side of the transformer is connected to both ends of the capacitor, and the low-pressure side of the transformer is connected to both ends of the thyristor-inductance circuit group. The coupled thyristor control serial compensation device has the advantages of greatly reducing the requirements on thyristors and accordingly reducing the production cost, and by means of equalization of the inductance of the circuits according to the number of used inductors, reducing the current load of a single thyristor, achieving real continuous adjustment on the inductance and eliminating the harmonic waves.

Description

Manifold type controlled series compensation device

Technical field

The present invention 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, realize the control of the outside equivalence capacitive reactance to series compensation capacitance, control the smooth adjustment that realizes series compensation capacitance and the control of dynamic response by silicon controlled is triggered.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 inductor loop of thyristor operating angle control, be not to change based on real inductance value, can produce a lot of harmonic waves, the quality of power supply does not ensure.

Summary of the invention

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

The object of the present invention is achieved like this: 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 invention 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 by some by thyristor controlled inductive circuit parallel connection, make to greatly reduce by each silicon controlled electric current, and then greatly reduce silicon controlled requirement, reduce cost of the present invention; Secondly, the present invention adjusts equivalent inductance value and no longer realizes by the silicon controlled angle of flow, 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.

Brief description of the drawings

Further illustrate the present invention below in conjunction with accompanying drawing.

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

Fig. 2 is electrical schematic diagram of the present invention.

What Fig. 3 was that the present invention 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, taking the 10KV circuit of rated current 800A as example, 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; Be 625 KP1 by thyristor controlled inductive circuit ... 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 uses while being fault current limiting.

In the time that 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 adjust building-out capacitor amount, and not produce harmonic wave.

In the time that 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, just approximate and common the control of reactive power compensating strategy of whole control strategy, 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.