CN103684164A - Magnetically-controlled reactor - Google Patents
Magnetically-controlled reactor Download PDFInfo
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- CN103684164A CN103684164A CN201210364750.8A CN201210364750A CN103684164A CN 103684164 A CN103684164 A CN 103684164A CN 201210364750 A CN201210364750 A CN 201210364750A CN 103684164 A CN103684164 A CN 103684164A
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Abstract
The invention relates to a magnetically-controlled reactor. The magnetically-controlled reactor comprises the following components of: a reactor winding which includes iron cores and coils of which the current magnitude is utilized to change the magnetic flux of the iron cores, wherein the coils are wound around the iron cores; and a rectifier bridge circuit of which the output end is connected with the coils in the reactor winding. Work current generated by the rectifier bridge circuit is applied to the coils, such that fast excitation of the iron cores can be realized, and therefore, the capacity of the magnetic flow of the iron cores can be increased fast. With the magnetically-controlled reactor adopted, fast demagnetization can be realized, and tap voltage and an additional excitation winding are not needed to be increased.
Description
Technical field
The present invention relates to a kind of reactor device of reactive power compensation, relate in particular to a kind of magnet controlled reactor.
Background technology
Magnet controlled reactor (Magnetically Controlled Reactor, MCR), as state type reactive power compensator one type, originates from magnetic amplifier and saturable reactor, but have essential distinction with saturable reactor in structure and performance.The technology Shi former Soviet Union of magnet controlled reactor is broken through, and domestic in being introduced at the end of last century, have that reliability is high, loss is low, take up an area less and harmonic pollution little, control the advantages such as easy, be widely used in the industries such as mine, metallurgy and electric power, become the main selection that substitutes thyristor-controlled reactor.
The basic functional principle of magnet controlled reactor is that the direct current by controlling in reactor winding can change the magnetic flux on iron core, thereby by changing the magnetic flux passing through on core of reactor, change the saturation of iron core, thereby change the sense value of reactor, to realize the variation of output reactive power.For the electric current with less, realize larger saturation, magnet controlled reactor adopts local saturation technique, have the sectional area of an iron leg core to be reduced, thereby be easy to reach magnetic saturation, and other parts is all in linear zone in whole excitation.This mode has significantly been improved power consumption, noise and the harmonic wave performance index of reactor.The manufacturing process of MCR is substantially consistent with transformer, and its cost, manufacturability and reliability are all close to transformer, and easy maintenance is applicable to being applied to the high occasions of environmental suitability requirement such as electric power system very much.Magnet controlled reactor except can be used for electric power system with improve electrical network ability to transmit electricity, improve grid voltage quality etc., also can be used for reactive power compensation, soft starter for motor of industrial factories and miness etc., there is very large application value.
MCR has been widely used in the industries such as electric power, mine, metallurgy at present, and along with the development of new forms of energy industry, in new forms of energy power station, MCR type reactive power compensator is also widely used simultaneously.But along with electrical network is to the improving constantly of the grid-connected requirement of new forms of energy industry, the response time index request of reactive power compensator is more and more stricter.And the excitation response time of traditional MCR type reactive power compensator is longer, more and more cannot meet strict grid-connected requirement.In addition, along with the expansion of range of application, at the scene in the face of rapid fluctuations load, response speed becomes the key factor of restriction MCR development.
A kind of mode that improves at present MCR response speed is to improve body tap voltage, but this mode can only improve quick-response excitation speed on the one hand, and this mode has improved the requirement of withstand voltage to controllable devices, weakened the advantage of MCR, reduced the advantage in superhigh pressure applications.Another kind of mode is that the mode by a set of winding of extra increase improves response speed, yet this mode has increased the cost of equipment and manufactured complexity, selection that neither be comparatively desirable.
Summary of the invention
The object of this invention is to provide a kind of magnet controlled reactor, can realize quick-response excitation, and without improving tap voltage and extra excitation winding.
For achieving the above object, the invention provides a kind of magnet controlled reactor, described magnet controlled reactor comprises:
Reactor winding, described reactor winding comprises iron core and around described iron core coil around, utilizes the current strength of described coil to change the magnetic flux of described iron core;
Rectifier circuit, the output of described rectifier circuit is connected with the coil in described reactor winding, described rectifier circuit produces forward high pressure and is carried on described coil, thereby makes described iron core quick-response excitation, and then increases fast the capacity of the magnetic flux of described iron core.
Compared with prior art, magnet controlled reactor provided by the invention can be realized quick-response excitation, and does not need to improve tap voltage and increase extra excitation winding.Through actual verification, the response time of magnet controlled reactor of the present invention has shortened 3-10 doubly than the response time of existing magnet controlled reactor, the Whole Response time can shorten in 30ms, can meet the requirement of new forms of energy power station to response speed, be applicable to the various industrial applications that need Quick reactive-load compensation response, for example, supergrid, superhigh pressure scene and the occasions such as scene that need to respond fast, alternative traditional TCR(thyristor-controlled reactor) type state type reactive power compensator.
Accompanying drawing explanation
The circuit theory diagrams of the magnet controlled reactor that Fig. 1 provides for the embodiment of the present invention one;
The circuit theory diagrams of a kind of bridge type semi-control rectifier bridge that Fig. 2 provides for the embodiment of the present invention one;
The circuit theory diagrams of a kind of bridge-type full-controlled rectifier bridge that Fig. 3 provides for the embodiment of the present invention one;
The circuit theory diagrams of the magnet controlled reactor that Fig. 4 provides for the embodiment of the present invention two;
The circuit theory diagrams of a kind of force the pass break circuit that Fig. 5 provides for the embodiment of the present invention two;
The circuit theory diagrams of the magnet controlled reactor that Fig. 6 provides for the embodiment of the present invention three;
The circuit theory diagrams of the magnet controlled reactor that Fig. 7 provides for the embodiment of the present invention four.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Magnet controlled reactor provided by the invention is the single excitation winding MCR type magnet controlled reactor that forces active excitation to control, the operation principle that its field-forcing is controlled is: use field-forcing control unit directly to control the direct current of reactor winding body, can increase fast as required excitation intensity, thereby realize quick-response excitation.Wherein, field-forcing control unit is realized by rectifier circuit and/or force the pass break circuit, by controllable devices being set in rectifier circuit or force the pass break circuit, and the control signal of the control system by application scenarios is controlled the on off operating mode of those controllable devices under different conditions, in order to change the direct current of reactor winding, realize quick-response excitation.
Embodiment mono-
Fig. 1 is the circuit theory diagrams of the magnet controlled reactor that provides of the present embodiment, and as shown in Figure 1, magnet controlled reactor of the present invention comprises: reactor winding and rectifier circuit, the output of rectifier circuit is directly connected with the coil in reactor winding, forms loop.
Reactor winding comprises two iron cores, is wound with two groups of coils described in each on iron core, has coil LA, coil LD on an iron core, has coil LB, coil LC on another one iron core.Coil LA leading-out terminal is connected with the end of incoming cables of coil LB, and the leading-out terminal of coil LC is connected with the end of incoming cables of coil LD, and four groups of coils are alter-parallel structure.Described in each, on iron core, there is one group of coil to be provided with the first tap, at the leading-out terminal of coil LA, draw the first tap 5, the leading-out terminal of coil LC is drawn the first tap 6, the first tap 5 is connected with one end of rectifier circuit output, the first tap 6 is connected with the other end of rectifier circuit output, forms loop.The utilization of reactor winding changes the magnetic flux of iron core by the current strength of coil.
Rectifier circuit comprises the first rectifier bridge RB1 and the second rectifier bridge RB2.The output of the first rectifier bridge RB1 and the second rectifier bridge RB2 is in parallel, is connected in output 7 and output 8, and output 7 is connected with the first tap 6 with the first tap 5 of reactor winding respectively with output 8.
The first rectifier bridge RB1 is for generation of operating current and offer described coil, the direct current while providing normal work for described reactor winding.
The second rectifier bridge RB2 is for generation of forward high pressure and be carried on described coil, thereby makes described iron core quick-response excitation, and then increases fast the capacity of the magnetic flux of described iron core.
What deserves to be explained is, the second rectifier bridge RB2 can also and be carried on described coil for generation of high back voltage, thereby the electric current of described coil is reduced rapidly, accelerates described iron core demagnetization.
The first rectifier bridge RB1 can be bridge type semi-control rectifier bridge, can be also bridge-type full-controlled rectifier bridge.The second rectifier bridge RB2 is specially bridge-type full-controlled rectifier bridge.
Fig. 2 is the circuit theory diagrams of a kind of bridge type semi-control rectifier bridge of providing of the present embodiment, as shown in Figure 2, bridge type semi-control rectifier bridge comprises diode D3, the diode D4 of isolating transformer T1, controllable devices S1, controllable devices S2 and two non-controllable devices, wherein controllable devices S1 and diode D3 series connection, controllable devices S2 and diode D4 series connection, and form bridge rectifier structure.The two ends of isolating transformer T1 secondary winding are connected to respectively the intermediate connection point of intermediate connection point, controllable devices S2 and the diode D4 series connection of controllable devices S1 and diode D3 series connection.The two ends of controllable devices S1 and diode D3 series connection are connected with the two ends of diode D4 series connection with controllable devices S2, and are connected with the two ends of diode D1, as output 7 and the output 8 of rectifier bridge.Wherein, diode D1 shields, a diode can certainly be in each controllable devices in parallel.
Fig. 3 is the circuit theory diagrams of a kind of bridge-type full-controlled rectifier bridge of providing of the present embodiment, and as shown in Figure 3, bridge-type full-controlled rectifier bridge comprises isolating transformer T2, controllable devices S3, controllable devices S4, controllable devices S5, controllable devices S6 and diode D2.Controllable devices S3, controllable devices S4, controllable devices S5, controllable devices S6 connect between two, form bridge rectifier structure.The two ends of isolating transformer T2 secondary winding are connected to respectively the intermediate connection point of intermediate connection point, controllable devices S4 and the controllable devices S6 of controllable devices S3 and controllable devices S5; Controllable devices S3 is connected with the two ends of controllable devices S6 series connection with controllable devices S4 with the two ends of controllable devices S5 series connection, and is connected with the two ends of diode D2, as output 7 and the output 8 of rectifier bridge.Wherein, diode D2 shields, a diode can certainly be in each controllable devices in parallel.
Controllable devices can be, but not limited to adopt controllable silicon, GTO(gate level turn-off thyristor)/IGBT(the bipolar transistor that insulate), IGCT(integrated gate commutated thyristor) or I EGT(electron injection enhancement gate transistor) etc. switching device.
The control utmost point of each controllable devices is connected with the control system of application scenarios, and control system controls by given control signal the on off operating mode that each controllable devices is different.
When normal work, system needs the first rectifier bridge RB1 that the operating current of direct current is provided.Now, the controllable devices on the first rectifier bridge RB1 needs conducting, makes isolating transformer T1 can be connected to the first tap 5 and the first tap 6, and now the second rectifier bridge RB2 does not work, and its controllable devices is in closed condition.Isolating transformer T1 is the power supply of a normal job, and the voltage while providing normal work for magnet controlled reactor, to provide the direct current of reactor winding.
If the first rectifier bridge RB1 adopts bridge-type full-controlled rectifier bridge, control system is controlled in the first rectifier bridge RB1 identical to the conducting state of the controllable devices of angular dependence, if controllable devices S4 is conducting state, controllable devices S5 is also conducting state, and vice versa.The on off operating mode of controllable devices of control system by controlling the second rectifier bridge RB2 is with output direct current.If the first rectifier bridge RB1 adopts bridge type semi-control rectifier bridge, the on off operating mode of controllable devices S1 and controllable devices S2 is contrary.
When system needs quick-response excitation, the second rectifier bridge RB2 provides a forward high pressure.Now, the controllable devices of the upper forward of the second rectifier bridge RB2 needs conducting, make isolating transformer T2 can be connected to the first tap 5 and the first tap 6, and now, the first rectifier bridge RB1 does not work, and its controllable devices is in closed condition.Isolating transformer T2 is a high voltage source, when rectifier bridge forward conduction, for magnet controlled reactor provides forward high pressure, impels the capacity of reactor to rise rapidly, realizes quick-response excitation.
If the second rectifier bridge RB2 adopts bridge-type full-controlled rectifier bridge, identical to the conducting state of the controllable devices of angular dependence in the second rectifier bridge RB2, if controllable devices S4 is conducting state, controllable devices S5 is also conducting state, and vice versa.Control system is selected wherein that group controllable devices conducting of forward, another group is closed condition, to control the second rectifier bridge RB2 output forward high pressure, the electric current of output is increased sharply, the iron core of reactor body is increased to excitation, small bore iron core is entered rapidly saturated, impel the capacity of reactor to rise rapidly, realize the effect of quick-response excitation.When control system detects body input capacity, reach re-set target, the second rectifier bridge RB2 quits work, and the first rectifier bridge RB1 provides the exciting current that need to maintain, and completes quick-response excitation.
When system needs demagnetization fast, the second rectifier bridge RB2 provides a high back voltage.Now, the upper reverse controllable devices of the second rectifier bridge RB2 needs conducting, make isolating transformer T2 can be connected to the first tap 5 and the first tap 6, and now, the first rectifier bridge RB1 does not work, and its controllable devices is in closed condition.Control system is selected that reverse group controllable devices conducting, another group is closed condition, to control the second rectifier bridge RB2 output high back voltage, when this high back voltage is added on reactor winding, make the electric current of flowing through coil LA, coil LB, coil LC and coil LD be reduced to rapidly the value needing, complete quick demagnetization.
Embodiment bis-
Fig. 4 is the circuit theory diagrams of the magnet controlled reactor that provides of the present embodiment, and as shown in Figure 4, magnet controlled reactor of the present invention comprises: reactor winding, force the pass break circuit HS and rectifier circuit.Only be with the difference of embodiment mono-, the present embodiment also comprises force the pass break circuit HS, be connected between the output of described rectifier circuit and the coil of described reactor winding, force the pass break circuit HS for disconnecting the electric current of described rectifier circuit output when demagnetizing fast, make to reduce rapidly by the electric current of described coil, described iron core is demagnetized rapidly.
Fig. 5 is the circuit theory diagrams of a kind of force the pass break circuit HS of providing of the present embodiment, and as shown in Figure 5, force the pass break circuit HS comprises controllable devices HS1, controllable devices HS2, isolating transformer T3 and buffer element HC2.
Isolating transformer T3 and diode HD1 and resistance HR are in series, one end of isolating transformer T3 secondary winding connects the anode of diode HD1, the other end connects one end of electric capacity HC1, the negative electrode of diode HD1 is connected with the other end of electric capacity HC1 by resistance HR, electric capacity HC1 is connected with the anode of controllable devices HS2, the other end of electric capacity HC1 is connected with the anode of controllable devices HS1, and be connected with the output 7 of described rectifier circuit, the negative electrode of controllable devices HS1 and controllable devices HS2 is connected as the output 5 of force the pass break circuit HS, can be connected with the first tap 5 of coil.The output 8 of described rectifier circuit is directly connected with the output 6 of force the pass break circuit HS, and output 6 is connected with the first tap 6 of coil.For avoiding the higher back-pressure in demagnetization process, by buffer element, high pressure absorbed and cushion.One end of buffer element HC2 is connected with the anode of diode HD2, and the negative electrode of diode HD2 is connected with output 5, and the other end of buffer element HC2 is connected with output 6.
Controllable devices can be, but not limited to adopt the switching devices such as controllable silicon, GTO/IGBT, IGCT or IEGT.The control utmost point of each controllable devices is also connected with the control system of application scenarios, and control system controls by given control signal the on off operating mode that each controllable devices is different.
Buffer element HC2 can be, but not limited to adopt electric capacity, resistance, lightning arrester or other overvoltage protectors, in order to absorb and to be buffered in the higher back-pressure producing in demagnetization process.
When system is during in normal work or quick-response excitation, controllable devices HS1 is in conducting state, controllable devices HS2 is in closed condition, being equivalent to rectifier circuit is connected with the first tap 6 with the first tap 5 of reactor winding, thereby when normal work, the operation principle of the first rectifier bridge RB1 is identical with the operation principle in embodiment mono-, when system needs quick-response excitation, the operation principle that the second rectifier bridge RB2 provides a forward high pressure is identical with embodiment mono-also.
When system needs demagnetization fast, controllable devices HS2 starts conducting state, make isolating transformer T3 on controllable devices HS1 in parallel, apply very high backward voltage, thereby the electric current flowing through on controllable devices HS1 is reduced to rapidly to the value needing, now close again controllable devices HS1, complete quick demagnetization.Now, the second rectifier bridge RB2 can provide high back voltage in order to coordinate force the pass break circuit HS1 to demagnetize fast, or also can be in closed condition.Generally speaking, the voltage of isolating transformer T3 is between the voltage of isolating transformer T1 and the voltage of isolating transformer T2.
Embodiment tri-
Fig. 6 is the circuit theory diagrams of the magnet controlled reactor that provides of the present embodiment, and as shown in Figure 6, magnet controlled reactor of the present invention comprises: reactor winding, force the pass break circuit HS and rectifier circuit.Only be with the difference of embodiment bis-, the reactor winding that the present embodiment adopts is non-common reactor winding body fast, and the concrete form that the present invention adopts reactor winding is not restricted.
Compare with embodiment bis-, the reactor winding of the present embodiment is also drawn the second tap 1 in the centre of coil LA, the second tap 3 is drawn in the centre of coil LD, between the second tap 1 and the second tap 3, be connected to controllable devices MS1, in the centre of coil LC, draw the second tap 2, in the middle of coil LB, draw between the second tap 4, the second taps 2 and the second tap 4 and be connected to controllable devices MS2, and the conducting direction of controllable devices MS1 and controllable devices MS2 is contrary.Between the first tap 5 and the second tap 6, be also provided with a fly-wheel diode MD.
Controllable devices can be, but not limited to adopt the switching devices such as controllable silicon, GTO/IGBT, IGCT or IEGT.The control utmost point of each controllable devices is also connected with the control system of application scenarios, and when normal work, control system controls by control signal the on off operating mode that each controllable devices is different.
When system is in quick-response excitation or while demagnetizing fast, two controllable devices and fly-wheel diode are in failure state, and now, concrete operation principle is identical with embodiment bis-, in this, repeats no more.
Embodiment tetra-
Fig. 7 is the circuit theory diagrams of the magnet controlled reactor that provides of the present embodiment, and as shown in Figure 7, magnet controlled reactor of the present invention comprises: reactor winding, force the pass break circuit HS and rectifier circuit.Compare with embodiment bis-, the rectifier circuit that the present embodiment adopts only comprises the first rectifier bridge RB1.
Now, the first rectifier bridge RB1, as controllable rectifier bridge, can, according to the instruction of control system, control output voltage by changing the angle of flow of controllable devices.When isolating transformer T1 gives the first rectifier bridge RB1, provide one during compared with high power supply voltage, due to the difference of the angle of flow, can make the lower voltage of the first rectifier bridge RB1 output, thereby maintain lower output current, make reactor be operated in normal regulating state.When needs quick-response excitation, change the angle of flow, can make the first rectifier bridge RB1 output high voltage, thereby export rapidly large electric current, reactor output capacity is changed rapidly.When needs demagnetize fast, utilize force the pass break circuit HS to make electric current be reduced to rapidly the value needing, or, change the angle of flow of controllable devices, can make the higher reverse voltage of the first rectifier bridge RB1 output, thereby reduce rapidly output current, reactor is demagnetized rapidly.Thereby in the present embodiment, force the pass break circuit HS also can omit.
It should be noted that, in order to improve the safety and stability of magnet controlled reactor, when adopting a rectifier bridge as controllable rectifier bridge, can improve by increasing the exterior insulation measure of reactor winding body the safety and stability of whole system.
Magnet controlled reactor provided by the invention, is to can be applicable to reactive power compensation, High Voltage Soft Starter and other application magnet controlled reactor device, can realize quick-response excitation, and does not need to improve tap voltage and increase extra excitation winding.
Through calculating and actual verification, the response time of magnet controlled reactor of the present invention has shortened 3-10 doubly than the response time of existing magnet controlled reactor, the Whole Response time can shorten in 30ms, can meet the requirement of new forms of energy power station to response speed, be applicable to the various industrial applications that need Quick reactive-load compensation response, for example, supergrid, superhigh pressure scene and the occasions such as scene that need to respond fast, alternative traditional TCR(thyristor-controlled reactor) type state type reactive power compensator.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. a magnet controlled reactor, is characterized in that, described magnet controlled reactor comprises:
Reactor winding, described reactor winding comprises iron core and around described iron core coil around, utilizes the current strength of described coil to change the magnetic flux of described iron core;
Rectifier circuit, the output of described rectifier circuit is connected with the coil in described reactor winding, described rectifier circuit produces forward high pressure and is carried on described coil, thereby makes described iron core quick-response excitation, and then increases fast the capacity of the magnetic flux of described iron core.
2. magnet controlled reactor according to claim 1, is characterized in that, described reactor winding comprises two iron cores, is wound with two groups of coils described in each on iron core, four groups of coil alter-parallels, and be connected with two outputs of described rectifier circuit.
3. magnet controlled reactor according to claim 2, is characterized in that, be also connected with controllable devices, and the conducting direction of two described controllable devices is contrary described in each described in two of iron core groups between coil.
4. magnet controlled reactor according to claim 1, is characterized in that, described rectifier circuit comprises the first rectifier bridge and the second rectifier bridge in parallel;
Described the first rectifier bridge, for generation of operating current and offer described coil;
Described the second rectifier bridge, for generation of forward high pressure and be carried on described coil, thereby makes described iron core quick-response excitation, and then increases fast the capacity of the magnetic flux of described iron core.
5. magnet controlled reactor according to claim 3, is characterized in that: described the second rectifier bridge is also for generation of high back voltage and be carried on described coil, thereby the electric current of described coil is reduced rapidly, accelerates described iron core demagnetization.
6. according to the magnet controlled reactor described in claim 3 or 4, it is characterized in that: described the first rectifier bridge is specially bridge type semi-control rectifier bridge or bridge-type full-controlled rectifier bridge;
Described the second rectifier bridge is specially bridge-type full-controlled rectifier bridge.
7. magnet controlled reactor according to claim 1, is characterized in that: described magnet controlled reactor also comprises:
Force the pass break circuit, described force the pass break circuit is connected between the output of described rectifier circuit and the coil of described reactor winding, for disconnecting the electric current of described rectifier circuit output, thereby the electric current of described coil is reduced rapidly, accelerate described iron core demagnetization.
8. magnet controlled reactor according to claim 7, is characterized in that: described force the pass break circuit comprises the first controllable devices, the second controllable devices, isolating transformer and buffer element;
Described the first controllable devices is connected between an output of described rectifier circuit and an input of described coil;
Described the second controllable devices and capacitances in series, and be connected in parallel with described the first controllable devices;
The secondary winding of described isolating transformer is in parallel through the first diode and resistance and described electric capacity;
Described buffer element is connected with two inputs of described coil through the second diode.
9. according to the magnet controlled reactor described in claim 3 or 8, it is characterized in that: described controllable devices, the first controllable devices or the second controllable devices are specially controllable silicon, gate level turn-off thyristor, insulation bipolar transistor, integrated gate commutated thyristor or electron injection enhancement gate transistor.
10. magnet controlled reactor according to claim 8, is characterized in that: described buffering device is specially electric capacity or resistance.
11. magnet controlled reactors according to claim 12, is characterized in that: described buffering device is specially overvoltage protector.
12. magnet controlled reactors according to claim 15, is characterized in that: described overvoltage protector is specially lightning arrester.
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| CN201210364750.8A CN103684164B (en) | 2012-09-26 | 2012-09-26 | Magnet controlled reactor |
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Cited By (3)
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| CN105119545A (en) * | 2015-08-13 | 2015-12-02 | 杭州银湖电气设备有限公司 | Rapid response magnetically controlled reactor device with novel voltage source control |
| CN106712036A (en) * | 2016-10-06 | 2017-05-24 | 聂恒伟 | Adjustable parallel reactor principle and control with excitation adjusting coil and component physical parameter design |
| CN107134957A (en) * | 2017-06-12 | 2017-09-05 | 杭州银湖电气设备有限公司 | Without tap magnet valve structure |
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| CN103684164B (en) | 2016-09-14 |
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