CN215731244U - Separately excited three-phase three-column magnetically controlled reactor - Google Patents
Separately excited three-phase three-column magnetically controlled reactor Download PDFInfo
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- CN215731244U CN215731244U CN202120581361.5U CN202120581361U CN215731244U CN 215731244 U CN215731244 U CN 215731244U CN 202120581361 U CN202120581361 U CN 202120581361U CN 215731244 U CN215731244 U CN 215731244U
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Abstract
The utility model discloses a separately excited three-phase three-column magnetically controlled reactor, belonging to the technical field of electrical control. In order to ensure the output waveform and reduce the cost, a squirrel-cage three-phase three-column symmetrical iron core is adopted, an alternating current working winding is wound on three iron core columns, and a direct current control winding is respectively wound on an upper yoke and a lower yoke which are composed of wound iron cores. The direct current control windings are connected in series and then connected in parallel, and two ends of the direct current control windings are connected with the direct current output end of the three-phase external direct current control power supply. The magnetic permeability of the upper yoke iron core and the lower yoke iron core is changed through the regulation and control of the direct current control power supply, so that the stepless regulation and control of the output current are realized. Has the characteristics of small volume, light weight, low cost, less loss and no harmonic wave. The voltage and the current can be regulated and controlled, and reactive compensation can be performed.
Description
Technical Field
The design relates to a separately excited three-phase three-column magnetically controlled reactor, which belongs to the technical field of electrical control.
Technical Field
The existing magnetically controlled reactors which adjust the reactance value by adjusting the iron core saturation degree through direct current can be divided into two types, one type is a magnetically saturable reactor CSR, and the other type is a magnetically valve reactor MCR.
The magnetic saturation reactor CSR comprises an iron core, a magnetic saturation reactor CSR is arranged on the iron core, an alternating current working winding and a direct current control winding are arranged on the iron core, and an external direct current power supply is used for controlling the direct current winding to change the magnetic permeability of the iron core so as to regulate and control the reactance value of the alternating current working winding. There are such deficiencies: not only is the third harmonic wave in the output waveform obviously increased and is not suitable for places or load requirements with requirements on the waveform, but also electromagnetic pollution and interference are caused to a power grid, the surrounding environment and equipment. Three phases need six iron core columns, so that the iron core consumption is large, the cost is high, and the iron loss is inevitably large.
The magnetic valve reactor MCR not only outputs a third harmonic wave in a waveform, but also exceeds the former in the aspects of electromagnetic noise, iron core heating and the like, and six iron core columns are also used for three phases.
One announcement number is: the 103680844B three-iron core column separately excited three-phase magnetically controlled reactor adopts a laminated iron core, and the regulation and control mode is a separately excited mode. There are still regrets in the utilization of the core material.
Based on this, the design tries to provide a separately excited three-phase three-column type magneto-controlled reactor which has no harmonic wave and improves the utilization rate of the iron core.
In order to realize the purpose, the technical scheme is as follows:
disclosure of Invention
A separately excited three-phase three-column magnetically controlled reactor comprises: three-phase three-column iron core, interchange work winding, direct current control winding and external direct current control power, characterized by: the separately excited three-phase three-column magnetically controlled reactor consists of a DC control winding and an AC working winding wound on a squirrel cage three-phase three-column symmetrical iron core and connected with a three-phase external DC control power supply.
The upper yoke and the lower yoke of the squirrel-cage three-phase three-column symmetrical iron core are composed of hexagonal wound iron cores, and three iron core columns are respectively fixed between three sides of the upper yoke which are not adjacent and three sides of the lower yoke which are not adjacent. The alternating current working winding is composed of windings respectively wound on three iron core columns. The direct current control winding is composed of windings respectively wound on the other three sides of the upper yoke and the other three sides of the lower yoke. The three-phase external direct current control power supply is formed by connecting a three-phase linear reactor with an alternating current input end of a three-phase bridge type voltage regulating and current rectifying circuit respectively. The windings of the upper yoke and the windings of the lower yoke are respectively connected in series and then connected in parallel in a way that the heads are connected with the tails of the upper yoke and the lower yoke, and two ends of the upper yoke and the lower yoke are connected with the positive end and the negative end of a three-phase external direct current control power supply. The magnetic permeability of the upper yoke and the lower yoke of the iron core is changed by regulating and controlling the three-phase external direct current control power supply, so that the alternating current working current is subjected to stepless change.
In another form of the utility model, the squirrel-cage three-phase three-column symmetrical iron core is composed of a three-dimensional triangular wound iron core. The alternating current working winding is composed of windings respectively wound on three iron core columns. The direct current control winding is composed of windings wound on three sides of the triangular upper yoke and three sides of the triangular lower yoke.
In another form of the utility model, the squirrel-cage three-phase three-column symmetrical iron core is formed by three-dimensional triangular iron cores formed by splicing side columns and side columns of three square-shaped overlapped and inserted iron cores. The alternating current working winding is composed of windings respectively wound on three iron core columns. The direct current control winding is composed of windings wound on three sides of the triangular upper yoke and three sides of the triangular lower yoke.
Has the characteristics that:
because the upper yoke and the lower yoke of the iron core adopt a winding structure, the material consumption is less, the material and processing cost is lower, a closed magnetic circuit is formed, and the third harmonic wave treatment is more facilitated.
Drawings
Fig. 1 is a shape and a structure diagram of a squirrel-cage three-phase three-column symmetrical iron core.
Fig. 2 is a star connection diagram of a separately excited three-phase three-column magnetically controlled reactor.
Fig. 3 is a circuit diagram of a three-phase external direct-current control power supply of a separately excited three-phase three-column magnetically controlled reactor.
Detailed Description
The separately excited three-phase three-column magnetically controlled reactor will be further described with reference to the accompanying drawings.
The separately excited three-phase three-column magnetically controlled reactor shown in fig. 2, which is made by adopting the squirrel-cage three-phase three-column symmetrical iron core shown in fig. 1, comprises: the three-phase three-column symmetrical iron core comprises a squirrel-cage three-phase three-column symmetrical iron core upper yoke and lower yoke 1, an iron core column 2, an alternating current working winding 3, an external direct current control power supply 4 and a direct current control winding 5. The upper and lower yokes 1 of the squirrel-cage three-phase three-column symmetrical iron core are composed of hexagonal wound iron cores, and two ends of three iron core columns 2 are fixed between three sides of the upper yoke which are not adjacent and three sides of the lower yoke which are not adjacent. Three iron core columns 2 are respectively wound with alternating current working windings 3, and the other three sides of the upper yoke which are not adjacent and the other three sides of the lower yoke which are not adjacent are respectively wound with direct current control windings 5. The windings of the upper yoke and the windings of the lower yoke are respectively connected in series and then connected in parallel in a way that the heads are connected with the tails of the upper yoke and the lower yoke, and two ends of the upper yoke and the lower yoke are connected with the positive output end and the negative output end of the three-phase external direct current control power supply 4.
The three-phase direct current control power supply 6 consists of a three-phase linear reactor L and a three-phase bridge type voltage regulating and rectifying circuit formed by diodes D1-D3 and unidirectional thyristors G1-G3. The access mode is that one end of each phase winding of the linear reactor L is connected with the serial connection point of the diode D and the unidirectional thyristor G, the other end of each phase winding is an alternating current input end and is respectively connected with an external power supply, and the positive output end and the negative output end of the voltage regulating and rectifying circuit are connected with the two ends of the direct current control winding 5.
The separately excited three-phase three-column magnetically controlled reactor works as follows:
when the regulated current of the three-phase external direct current control power supply 4 is linearly increased, the current of the direct current control winding 5 is linearly increased immediately, the magnetic permeability of the upper yoke core and the lower yoke core begins to be reduced, the reactance value of the alternating current working winding 3 is reduced, and the working current begins to be increased. When the regulated current of the direct current control winding 5 is linearly reduced, the magnetic permeability of the iron core begins to rise, and the current of the alternating current working winding 3 is reduced. The upper and lower yokes made of hexagonal wound cores constitute a closed common magnetic path and the magnetic paths on both sides of each core limb are symmetrical. The direct current control windings 5 wound around the common magnetic circuit and connected in series with each other constitute a common circuit, so that the third harmonic currents of the three-phase alternating current working windings are equal in magnitude but opposite in phase and cancel each other to zero at any time of the instantaneous value of the mutual induction voltage generated by the common circuit. Since the third harmonic is a superposition of other odd harmonics (5, 7 …), the other odd harmonics are also zero. Therefore, the iron core material is saved, and the low-cost alternating current harmonic elimination circuit is formed.
The output current of the external direct current control power supply 4 is increased or reduced, and the working current of the alternating current working winding 3 is increased or reduced accordingly.
Claims (7)
1. A separately excited three-phase three-column magnetically controlled reactor comprises: three-phase three-column iron core, interchange work winding, direct current control winding and external direct current control power, characterized by: the separately excited three-phase three-column magnetically controlled reactor consists of a DC control winding and an AC working winding wound on a squirrel cage three-phase three-column symmetrical iron core and connected with a three-phase external DC control power supply.
2. The separately excited three-phase three-column magnetically controlled reactor according to claim 1, characterized in that: the upper yoke and the lower yoke of the squirrel-cage three-phase three-column symmetrical iron core are composed of hexagonal wound iron cores, and three iron core columns are respectively fixed between three sides of the upper yoke which are not adjacent and three sides of the lower yoke which are not adjacent; the alternating current working winding is composed of windings respectively wound on three iron core columns; the direct current control winding is composed of windings respectively wound on the other three sides of the upper yoke and the other three sides of the lower yoke; the three-phase external direct current control power supply is formed by respectively connecting a three-phase linear reactor with an alternating current input end of a three-phase bridge type voltage regulating and rectifying circuit; the windings of the upper yoke and the windings of the lower yoke are respectively connected in series and then connected in parallel in a way that the heads are connected with the tails of the upper yoke and the lower yoke, and the two ends of the upper yoke and the two ends of the lower yoke are connected with the positive end and the negative end of a three-phase external direct current control power supply; the magnetic permeability of the upper yoke and the lower yoke of the iron core is changed by regulating and controlling the three-phase external direct current control power supply, so that the alternating current working current is subjected to stepless change.
3. The separately excited three-phase three-column magnetically controlled reactor according to claim 2, characterized in that: the squirrel-cage three-phase three-column symmetrical iron core consists of a three-dimensional triangular wound iron core; the alternating current working winding is composed of windings respectively wound on three iron core columns; the direct current control winding is composed of windings respectively wound on three sides of the triangular upper yoke and three sides of the triangular lower yoke.
4. The separately excited three-phase three-column magnetically controlled reactor according to claim 2, characterized in that: the squirrel-cage three-phase three-column symmetrical iron core is formed by three triangular iron cores formed by splicing side columns and side columns of three square-shaped overlapped iron cores; the alternating current working winding is composed of windings respectively wound on three iron core columns; the direct current control winding is composed of windings respectively wound on three sides of the triangular upper yoke and three sides of the triangular lower yoke.
5. The separately excited three-phase three-column magnetically controlled reactor according to claim 1, characterized in that: the three-phase external direct current control power supply is composed of a three-phase bridge type voltage regulating and rectifying circuit formed by diodes and thyristors.
6. The separately excited three-phase three-column magnetically controlled reactor according to claim 1, characterized in that: the external direct current control power supply consists of a three-phase linear reactor and a three-phase voltage regulating and rectifying circuit; one end of each phase winding of the linear reactor is an alternating current input end, the other end of each phase winding of the linear reactor is connected with the alternating current input end of the three-phase voltage-regulating rectifying circuit, and the positive end and the negative end of the three-phase voltage-regulating rectifying circuit are direct current output ends.
7. The separately excited three-phase three-column magnetically controlled reactor according to claim 1, characterized in that: the external direct current control power supply is composed of a voltage regulating and rectifying circuit made of power electronic devices working in a switch state (PWM).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120581361.5U CN215731244U (en) | 2021-03-22 | 2021-03-22 | Separately excited three-phase three-column magnetically controlled reactor |
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| CN202120581361.5U CN215731244U (en) | 2021-03-22 | 2021-03-22 | Separately excited three-phase three-column magnetically controlled reactor |
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