CN201328101Y

CN201328101Y - Safe and reliable outer exciting magnetic control electric reactor device

Info

Publication number: CN201328101Y
Application number: CNU2008201868401U
Authority: CN
Inventors: 吴志坚; 金丽莉; 虞晓东; 王宝安
Original assignee: Southeast University; Yangzhou Power Supply Co of Jiangsu Electric Power Co
Current assignee: State Grid Corp of China SGCC; Southeast University; State Grid Jiangsu Electric Power Co Ltd; Yangzhou Power Supply Co of Jiangsu Electric Power Co
Priority date: 2008-11-05
Filing date: 2008-11-05
Publication date: 2009-10-14
Anticipated expiration: 2018-11-05

Abstract

The utility model relates to a safe and reliable outer exciting magnetic control electric reactor device, which consists of an AC power supply of 220V, a bidirectional thyristor, an isolation transformator, a diode rectification circuit, an electric reactor and a trigger pulse control circuit. The electric reactor device is mainly characterized in that the size of direct current exciting current of a circuit is adjusted by controlling the trigger angle of the bidirectional thyristor so as to change the magnetic saturation of a magnet core; stepless regulation is carried out for the capacity of the electric reactor so as to achieve the purpose of the idle work output of the stepless regulation and further achieve real-time trace for the reactive power change of power grids. The electric reactor device is mainly characterized in that the direct current excitation of the magnet core is provided by an external circuit; the size of DC current is changed by controlling the alternate conduction of the thyristor so as to achieve high stability. After the isolation by the isolation transformator, the electric potential of the thyristor is low and the fault of puncture does not exist. The reactor device is applicable to the regulation of the reactive power of the power grids with any voltage class.

Description

Safe and reliable outer excitation-type magnet controlled reactor device

Technical field

The utility model belongs to safe and reliable outer excitation-type magnet controlled reactor device, and concrete is to change magnetic saturation unshakable in one's determination by the control loop DC excitation, changes reactance value, thus the device of the idle output of smooth adjustment.Be applicable to electric power system, industrial cousumer, electric railway etc.

Background technology

Along with the development and national economy of China, the demand of electric power is increasing, and meanwhile, the resistance sense load occupies very big ratio, has produced a large amount of no-power vacancies, simultaneously electrical network has been caused pollution.A large amount of powerful power electronic equipments produces the harmonic current of a large amount of reactive powers such as phase controlled rectifier, frequency converter, multiplex inverter.The metallurgical production power consumption equipment much belongs to the impact load.Rolling mill, arc furnace are typical case's representatives wherein.The rapid variation of impact load reactive power will cause voltage ripple of power network, particularly be accompanied by thyristor unsteady flow broad application, and low power factor when it is controlled deeply and wave distortion have more seriously worsened grid voltage quality.Overcome the voltage fluctuation that impact load causes, must adopt response Fast Dynamic reactive power compensator.

After reactive power compensator such as shunt capacitor is installed in electrical network, the reactive power that can provide inductive reactance on the spot and consumed, reduced that electric network source provides to inductive load, and the reactive power of carrying by circuit, just because of having reduced reactive power flowing in electrical network, also just reduced the electric energy loss of circuit and transformer because of carrying reactive power to cause, reactive power compensation that Here it is, it can improve power factor.Reactive power compensation has very important meaning to power system security, reliability service, and this is a wastage reducing and energy saving measure that requires less investment while yielding quicker results.

Reactive power compensator commonly used at present mainly contains: synchronous compensator, switch on-off capacitor group, thyristor switchable capacitor (TSC), thyristor-controlled reactor (TCR), Static Var Compensator (STATCOM), magnet controlled reactor (MCR) etc.

At present magnet controlled reactor has arrived extensive use in electric power system, but its resolution system changes reactive power compensation and the very difficult problem of voltage-regulation that is caused greatly because of trend, for the ability to transmit electricity that improves electrical network, adjust line voltage, compensating power, and over-voltage all has very large application potential.Characteristics are to change magnetic saturation unshakable in one's determination by the control loop DC excitation, thereby reach the purpose of the idle output of smooth adjustment.Difference according to excitation mode is divided into self-excitation magnetic-type controlled reactor and outer excitation-type magnet controlled reactor.

In the self-excitation magnetic-type magnet controlled reactor, DC excitation unshakable in one's determination is to be provided by the direct current of self in the rectification circuit, and advantage is that work winding and control winding are united two into one, and helps saving material and reduces loss.Shortcoming is that self-excitation magnetic-type magnet controlled reactor stability is not high, in case the line voltage instability, DC excitation electric current unshakable in one's determination is affected, thereby influences idle adjusting.

At present, the normal apparatus structure that adopts of outer excitation-type magnet controlled reactor as shown in Figure 2, the 220V alternating current by the rectification of bridge-type all controlled rectifier circuit, provides direct current to iron core after the transformer step-down.By the angle of flow of control thyristor, the control loop direct current, thus change magnetic saturation unshakable in one's determination, reach the purpose of adjusting idle output.The shortcoming of this device is to lack isolation link between thyristor and electrical network, the current potential height that thyristor bears, because the restriction of manufacturing process, thyristor is easily breakdown, the failure rate height.

Summary of the invention

Technical problem: the purpose of this utility model is at the problem of above-mentioned each device, and a kind of novel safe and reliable outer excitation-type magnet controlled reactor is provided.Have and be easy to realize that simple in structure, the performance height can be realized the idle output of smooth adjustment, guarantees the advantage of power supply quality and power grid security preferably.

Technical scheme: safe and reliable outer excitation-type magnet controlled reactor device of the present utility model is achieved through the following technical solutions.This device comprises 220V AC power, bidirectional triode thyristor, isolating transformer, diode rectifier circuit, reactor, trigger impulse control circuit.It is characterized in that the main iron core of reactor is split into two halves, each half iron core is divided into up and down two windings, being parallel in the electrical network after two winding interconnections up and down of different iron cores; Bidirectional triode thyristor, isolating transformer, diode rectifier circuit are connected 220V alternating current source; Be connected on two silicon controlled gate poles for its adjustable trigger impulse control circuit of trigger angle that takes turns conducting.The size of reactance value is decided with the iron circuit degree of saturation, and the core sataration degree is high more, and the induction reactance of reactor is more little.Size by control silicon controlled trigger angle changes direct current size in the loop, and then changes the magnetic saturation of iron core, regulates reactance, thereby reaches the purpose of the idle output of smooth adjustment.

The DC excitation of described iron core is provided by external dc power, and silicon controlled takes turns conducting alternating current is become the direct current of variation, through providing the DC excitation electric current for iron core after isolating transformer step-down, the diode rectifier circuit rectification.This excitation mode stability is high, easy to control, have the characteristics of high-performance, high reliability, and operation maintenance is simple.The current potential of thyristor is low, does not have breakdown fault, can be used for any electric pressure electrical network.

Beneficial effect: this device is provided with 220V AC power, bidirectional triode thyristor, isolating transformer, diode rectifier circuit, reactor, trigger impulse control circuit.The utility model is by the break-make of trigger impulse control circuit control bidirectional triode thyristor, changes loop direct current size, thereby changes magnetic saturation unshakable in one's determination, reaches the idle purpose of smooth adjustment output.It is idle that the utility model can realize with the variation of electrical network through-put power regulating output automatically.When the electrical network through-put power was big, reactor operated in zero load or low capacity state; When the electrical network through-put power was less or unloaded, reactor increased capacity automatically, compensated idlely over the ground, had limited the power-frequency voltage rising, had improved the quality of power supply to a great extent.

Description of drawings

Fig. 1 is the structural representation of safe and reliable outer excitation-type magnet controlled reactor device;

Fig. 2 is the structural representation of the magnet controlled reactor of DC excitation.

Embodiment

The present invention is further described below in conjunction with accompanying drawing.

Referring to accompanying drawing 1, safe and reliable outer excitation-type magnet controlled reactor device, this device comprises 220V AC power 1, bidirectional triode thyristor 2, isolating transformer 3, diode rectifier circuit 4, reactor 5, trigger impulse control circuit 6.The main iron core of described reactor 5 is split into two halves, and each half iron core is divided into up and down two windings, being parallel in the electrical network after two winding interconnections up and down of different iron cores; Bidirectional triode thyristor 2, isolating transformer 3, diode rectifier circuit 4 are connected on 220V AC power 1 side; Be connected on two silicon controlled gate poles for its adjustable trigger impulse control circuit 6 of trigger angle that takes turns conducting.The size of reactance value is decided with the iron circuit degree of saturation, and the core sataration degree is high more, and the induction reactance of reactor is more little.In a power frequency period of power supply, change the size that the silicon controlled trigger angle just can change exciting current, thereby change the saturation of core of reactor, regulate the capacity of reactor smoothly, continuously, reach the purpose of the idle output of smooth adjustment.

The characteristics of the utility model maximum are that the DC excitation of described iron core is provided by external dc power.Silicon controlled takes turns conducting alternating current is become the direct current of variation, through providing the DC excitation electric current for iron core after isolating transformer step-down, the diode rectifier circuit rectification.This excitation mode stability is high, is easy to control, have the characteristics of high-performance, high reliability, and operation maintenance is simple.The current potential of thyristor is low, does not have breakdown fault, can be used for any electric pressure electrical network.

The outer exciting magnetic control electric reactor of the utility model can be according to the variation of line voltage or through-put power big Little self capacity of automatically regulating reaches the purpose of the idle output of smooth adjustment. The utility model is existing various On the basis of reactive power compensator, for the problem that they exist, adopted outside DC excitation formula in application Magnet controlled reactor, make reactive power compensation technology further perfect, operation is more reliable, compensation effect is better, safeguard more For simply. Compare with the dynamic reactive compensation device of other type, have more superiority at high pressure, have wide Wealthy application space.

Claims

1. A safe and reliable externally excited magnetron reactor device, characterized in that the device includes a 220V AC power supply (1), a bidirectional thyristor (2), an isolation transformer (3), and a diode rectifier circuit (4) , a reactor (5), a trigger pulse control circuit (6); wherein, the main iron core of the reactor (5) is split into two halves, each half of the iron core is divided into upper and lower windings, and the upper and lower windings of different iron cores connected in parallel to the power grid after cross-connection; bidirectional thyristor (3), isolation transformer (2), and diode rectifier circuit (4) are connected to the side of 220V AC power supply (1); the gates of two bidirectional thyristors (3) A trigger pulse control circuit (6) with adjustable trigger angle for conducting in turn is connected thereto.