CN109755945B - Magnetically controlled reactor based on pulse current control - Google Patents
Magnetically controlled reactor based on pulse current control Download PDFInfo
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- CN109755945B CN109755945B CN201910260123.1A CN201910260123A CN109755945B CN 109755945 B CN109755945 B CN 109755945B CN 201910260123 A CN201910260123 A CN 201910260123A CN 109755945 B CN109755945 B CN 109755945B
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Abstract
The invention discloses a magnetic control reactor based on pulse current control, which comprises an adjusting control circuit unit and an isolation transformer, wherein the adjusting control circuit unit comprises a magnetic control reactor body, a square wave pulse control current generating circuit, an inductance element and a controllable bridge rectifier circuit, the magnetic control reactor body is of a three-column type iron core structure and comprises a middle column iron core and two side column iron cores, a main winding is wound on the outer surface of the middle column iron core, a first control winding and a second control winding are wound on the outer surfaces of the two side column iron cores respectively, and the square wave pulse control current generating circuit comprises a super capacitor, a bidirectional control quick switch and a series resistor. The magnetic control reactor realizes adjustment by changing the size and direction of direct current magnetic flux within half cycle, has high adjustment speed, requires small square wave current for control, and can realize continuous and smooth adjustment of controllable reactive current.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a magnetically controlled reactor based on pulse current control.
Background
At present, the kinds of controllable reactors used in power systems are various, from the earliest synchronous phase modulators to controllable reactors for adjusting taps, Thyristor Controlled Reactors (TCR), magnetic saturable reactors controlled by permeability, magnetic valve type reactors (MCR), transformer type controllable reactors (TCT) for controlling the secondary short-circuit time of a transformer by using thyristors, Static Var Generators (SVG) controlled by using IGBT bridges, and the like.
In the reactor, the magnetic saturation reactor and the magnetic valve type reactor are both traditional direct current excitation type magnetically controlled reactors, a direct current magnetic flux control mode that an iron core column is led in a fixed direction is adopted, the direct current magnetic flux is only changed in size without changing the direction during control, the adjusting speed is slow, and the inertia is large. The invention provides a magnetically controlled reactor which is completely different from the controllable reactor in working principle and is used for solving the problems.
Disclosure of Invention
The invention aims to provide a magnetically controlled reactor based on pulse current control, which realizes continuous and smooth regulation of controllable reactive current and has high regulation speed.
The technical scheme adopted by the invention is as follows: the device comprises an isolation transformer and an adjusting control circuit unit, wherein secondary windings of the isolation transformer are connected with the input end of the adjusting control circuit unit, and the number of the secondary windings of the isolation transformer corresponds to that of the adjusting control circuit unit;
The regulating and controlling circuit unit comprises a magnetically controlled reactor body, a square wave pulse control current generating circuit, an inductance element and a controllable bridge rectifier circuit, wherein two ends of a secondary winding of the isolation transformer are respectively connected with two input ends of the controllable bridge rectifier circuit, one output end of the controllable bridge rectifier circuit is connected with the square wave pulse control current generating circuit through the inductance element, the other output end of the controllable bridge rectifier circuit is connected with the square wave pulse control current generating circuit, and the square wave pulse control current generating circuit is connected with the magnetically controlled reactor body;
the magnetic control reactor body is of a three-column iron core structure and comprises a middle column iron core and two side column iron cores, wherein a main winding is wound on the outer surface of the middle column iron core, the main winding is connected in parallel with a power grid, a first control winding and a second control winding are wound on the outer surfaces of the two side column iron cores respectively, and the wire outlet end of the first control winding is connected with the wire outlet end of the second control winding;
the square wave pulse control current generation circuit comprises a super capacitor, a bidirectional control fast switch and a series resistor, wherein one end of the bidirectional control fast switch is connected with one end of the super capacitor, one end of the series resistor is connected with the other end of the super capacitor, the other end of the bidirectional control fast switch is connected with a wire inlet end of a first control winding, and the other end of the series resistor is connected with a wire inlet end of a second control winding;
One output end of the controllable bridge rectifier circuit is connected with one end of an inductance element, the other end of the inductance element is connected with the positive electrode of a super capacitor, and the negative electrode of the super capacitor is connected with the other output end of the controllable bridge rectifier circuit.
Preferably, when the magnetically controlled reactor body is single-phase, the isolation transformer is provided with a secondary winding;
when the magnetic control reactor body is in a three-phase state, the isolation transformer is provided with three secondary windings, each secondary winding is correspondingly connected with one adjusting control circuit unit, and the connection mode is the same as that of the single-phase state;
preferably, the two side column iron cores are symmetrical in structure and equal in sectional area, and the sectional area of the middle column iron core is 2 times that of the side column iron cores.
Preferably, in order to make the induced electromotive forces generated by the magnetic flux of the main winding on the magnetic control reactor body on the two control windings cancel each other, the first control winding and the second control winding have the same number of turns.
Preferably, in order to adjust the amplitude of the square-wave pulse control current generated by the square-wave pulse control current generation circuit in a stepped manner, the series resistor is a switchable resistor, and the switchable resistor is provided with multiple stages.
Preferably, the super capacitor is a farad capacitor, and the capacitance is 1-10F.
Preferably, in order to adjust the dc voltage on the super capacitor and realize the function of changing the amplitude of the pulse current, the controllable bridge rectifier circuit is a thyristor bridge rectifier circuit.
The primary side of the isolation transformer of the invention is connected with a mains supply, a signal output by the secondary side is rectified by a controllable bridge rectifier circuit and then supplies power to a super capacitor, the super capacitor which stores huge energy is used as a constant voltage source, the voltage source of the super capacitor is converted into a current source by a series resistor, then square wave current is output by a bidirectional control fast switch and is a large current, the current signal is a control signal of a pulse current control magnetic control reactor, a main winding is connected in parallel with a power grid, the zero crossing point of the square wave current control signal and the primary current generated by the main winding keep synchronous zero crossing, the magnetic permeability of the magnetic control reactor in a half period can be rapidly changed, and further the magnetic saturation and the size and the direction of direct current flux are changed to realize the primary current regulation of the magnetic control reactor and control the inductive current flowing through the magnetic control reactor winding, the regulation speed is high, and the continuous smooth regulation of the controllable reactive current can be realized.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
fig. 2 is a circuit diagram of a square-wave pulse control current generation circuit according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention includes an adjusting control circuit unit 1 and an isolating transformer 2, secondary windings of the isolating transformer 2 are connected to two input ends of the adjusting control circuit unit 1, the number of the secondary windings of the isolating transformer 2 corresponds to the number of the adjusting control circuit unit 1, and a primary side of the isolating transformer 2 is connected to a mains supply.
The adjusting and controlling circuit unit 1 comprises a magnetically controlled reactor body 11, a square wave pulse control current generating circuit 12, an inductance element L and a controllable bridge rectifying circuit 13, two ends of a secondary winding of the isolation transformer 2 are respectively connected with two input ends of the controllable bridge rectifying circuit 13, one output end of the controllable bridge rectifying circuit 13 is connected with the square wave pulse control current generating circuit 12 through the inductance element L, the other output end of the controllable bridge rectifying circuit 13 is connected with the square wave pulse control current generating circuit 12, and the square wave pulse control current generating circuit 12 is connected with the magnetically controlled reactor body 11.
The magnetic control reactor body 11 is of a three-column iron core structure and comprises a middle column iron core 111 and two side column iron cores 112, a main winding 113 is wound on the outer surface of the middle column iron core 111, the main winding 113 is connected in parallel to a power grid, a first control winding 114 and a second control winding 115 are wound on the outer surfaces of the two side column iron cores 112 respectively, a wire outlet end of the first control winding 114 is connected with a wire outlet end of the second control winding 115, the wire outlet ends of the two control windings are connected in series in a reversed polarity mode, the purpose is to ensure that induced electromotive forces generated by magnetic flux of the main winding 113 on the two control windings can be offset, the two control windings are pure in resistance after being connected in series, and square wave pulse current can be conveniently passed through.
As shown in fig. 2, the square-wave pulse control current generating circuit 12 includes a super capacitor C, a bidirectional control fast switch 121 and a series resistor 122, one end of the bidirectional control fast switch 121 is connected to one end of the super capacitor C, one end of the series resistor 122 is connected to the other end of the super capacitor C, the other end of the bidirectional control fast switch 121 is connected to the line inlet end of the first control winding 114, the other end of the series resistor 122 is electrically connected to the line inlet end of the second control winding 115, the series resistor 122 is formed by connecting a plurality of switchable resistors 123 in series, the amplitude of the square-wave pulse control current generated by the series resistor 122 can be adjusted in stages, and when the current amplitude is large, the switch K of the switchable resistor 123 is enabled to control the amplitude of the square-wave pulse control current 1 And (or) K 2 Is disconnected, thereby making the resistor R 1 And (or) R 2 Plays a role of current limiting and grading, and when the current amplitude is larger, the switch K on the switchable resistor 123 is enabled to be switched 1 And (or) K 2 When the positive zero crossing of the primary current of the corresponding phase in the magnetic control reactor is detected, the trigger signal is firstly turned off and simultaneously turned on, and on the contrary, when the negative zero crossing of the primary current is detected, the trigger signal of the IGBT is firstly turned off and simultaneously turned on.
One output end of the controllable bridge rectifier circuit 13 is connected with one end of an inductance element L, the other end of the inductance element L is connected with the anode of a super capacitor C, the cathode of the super capacitor C is connected with the other output end of the controllable bridge rectifier circuit 13, the inductance element L is used for smoothing the charging current of the super capacitor C, a mains supply is used as the primary side of the isolation transformer 2, the power supply of the super capacitor C is realized by a single-phase or three-phase alternating current power supply through the controllable bridge rectifier circuit, the controllable bridge rectifier circuit 13 is correspondingly a single-phase controllable bridge rectifier circuit or a three-phase controllable bridge rectifier circuit, the controllable bridge rectifier circuit 13 is a thyristor bridge rectifier circuit, the effect of adjusting the direct current voltage on the super capacitor C can be realized by changing the trigger angle of the thyristor 131, and the amplitude of the pulse control current is further changed.
When the magnetically controlled reactor body 11 is single-phase, the isolation transformer 2 is provided with one secondary winding, when the magnetically controlled reactor body 11 is three-phase, the isolation transformer 2 is provided with three secondary windings, each secondary winding is correspondingly connected with one adjusting and controlling circuit unit 1, and the connection mode is the same as that of single-phase, namely for the magnetically controlled reactor body 11 of three-phase, the three single-phase control circuits respectively trigger the control windings on the magnetically controlled reactor body 11 of corresponding phase, and for the magnetically controlled reactor body 11 of three-phase, the three single-phase magnetically controlled reactor bodies are Y-connected or delta-connected, the two connection modes are common knowledge in the art, and no further description is given here.
The two side column iron cores 112 are symmetrical in structure and equal in sectional area, and the sectional area of the middle column iron core 111 is 2 times that of the side column iron core 112, so that the structural symmetry of the first control winding 114 and the second control winding 115 can be realized.
The first control winding 114 and the second control winding 115 have the same number of turns, so that induced electromotive forces generated by the magnetic flux of the main winding 113 on the magnetic control reactor body on the two control windings are mutually offset, and square-wave pulse current is conveniently passed through.
The series resistor 122 is composed of a switchable resistor 123, the switchable resistor 123 is provided with multiple stages, a switch used for the switchable resistor 123 may be a conventional mechanical switch, or may be a power electronic device such as a thyristor or an IGBT, and the switchable resistor 123 is used for adjusting the amplitude of the square wave pulse control current generated by the square wave pulse control current generating circuit 12 in stages.
The super capacitor C is a farad capacitor, the capacitance is 1-10F, the specific capacitance is determined according to the power of the magnetically controlled reactor, the farad capacitor is adopted firstly because the capacitance is very large, the heavy current discharging capability is strong, the requirements of the invention are met, and secondly, the farad capacitor also has the advantages of long service life, environmental protection and no pollution.
The controllable bridge rectifier circuit 13 is a thyristor bridge rectifier circuit, and can change an antenna of the thyristor 131 to realize the function of adjusting the direct current voltage on the super capacitor C, so as to change the amplitude of the pulse control current.
In summary, the main winding 113 on the magnetic control reactor body 11 is directly connected in parallel to the power supply grid, the outlet ends of the first control winding 114 and the second control winding 115 are connected in series with reversed polarity, so as to ensure that the induced electromotive forces generated by the magnetic flux of the main winding 113 on the two control windings can be cancelled, the two control windings are connected in series to have pure resistance characteristics, the inlet end of the first control winding 114 and the inlet end of the second control winding 115 are respectively connected with the two ends of the square wave pulse control current generating circuit 12, and the first control winding 114 is used as the input end of the magnetic control reactor body, the second control winding 115 is used as the output end of the magnetic control reactor body, the square wave pulse control current generating circuit 12 outputs square wave current which is high current, so that the square wave control current generated by the square wave pulse control current generating circuit 12 and the primary current passing through the main winding 113 simultaneously zero cross zero in the positive and negative half cycles of the current, ensuring that a forward direct current flux is added into the iron core when the primary current is in a positive half cycle, reducing the magnetic conductivity, increasing the amplitude of the primary current in the positive half cycle, adding a reverse direct current flux when the primary current is in a negative half cycle, changing the magnetic conductivity, increasing the amplitude of the primary current in the negative half cycle, and further realizing the function of changing the size of the primary current in one cycle by adjusting the amplitude of the square wave pulse control current, wherein the square wave pulse control current is generated by adopting a bidirectional control quick switch 121, a super capacitor C for storing huge electric field energy is used as a nearly constant voltage source, the voltage source is converted into a square wave current source by the action of a series resistor 122, the power supply of the super capacitor C is realized by an isolation transformer 2 and a bridge type controllable rectifying circuit 13, and simultaneously, the quick adjustment of the voltage at two ends of the super capacitor C can be realized by controlling the trigger angle of a thyristor 131 on the controllable bridge type rectifying circuit 13, the inductive current flowing through the winding of the magnetically controlled reactor can be quickly adjusted along with the inductive current, and the continuous and smooth adjustment of the controllable reactive current can be realized.
Claims (7)
1. The utility model provides a magnetic control reactor based on pulse current control which characterized in that: the device comprises an adjusting control circuit unit and an isolating transformer, wherein secondary windings of the isolating transformer are connected with the input end of the adjusting control circuit unit, and the number of the secondary windings of the isolating transformer corresponds to that of the adjusting control circuit unit;
the regulating and controlling circuit unit comprises a magnetically controlled reactor body, a square wave pulse control current generating circuit, an inductance element and a controllable bridge rectifier circuit, wherein two ends of a secondary winding of the isolation transformer are respectively connected with two input ends of the controllable bridge rectifier circuit, one output end of the controllable bridge rectifier circuit is connected with the square wave pulse control current generating circuit through the inductance element, the other output end of the controllable bridge rectifier circuit is connected with the square wave pulse control current generating circuit, and the square wave pulse control current generating circuit is connected with the magnetically controlled reactor body;
the magnetic control reactor body is of a three-column iron core structure and comprises a middle column iron core and two side column iron cores, wherein a main winding is wound on the outer surface of the middle column iron core, the main winding is connected in parallel with a power grid, a first control winding and a second control winding are wound on the outer surfaces of the two side column iron cores respectively, and the wire outlet end of the first control winding is connected with the wire outlet end of the second control winding;
The square wave pulse control current generation circuit comprises a super capacitor, a bidirectional control fast switch and a series resistor, wherein one end of the bidirectional control fast switch is connected with one end of the super capacitor, one end of the series resistor is connected with the other end of the super capacitor, the other end of the bidirectional control fast switch is connected with a wire inlet end of a first control winding, and the other end of the series resistor is connected with a wire inlet end of a second control winding;
one output end of the controllable bridge rectifier circuit is connected with one end of an inductance element, the other end of the inductance element is connected with the positive electrode of a super capacitor, and the negative electrode of the super capacitor is connected with the other output end of the controllable bridge rectifier circuit.
2. The pulse current control-based magnetically controlled reactor according to claim 1, characterized in that: the magnetic control reactor body is a three-phase magnetic control reactor, the isolation transformer is provided with three secondary windings, each secondary winding is correspondingly connected with one adjusting control circuit unit, and the connection mode is the same as that of a single phase.
3. The pulse current control-based magnetically controlled reactor according to claim 1, characterized in that: two the side column iron core structure symmetry, and the sectional area equals, the sectional area of middle post iron core 2 times of side column iron core sectional area.
4. The pulse current control-based magnetically controlled reactor according to claim 1, characterized in that: the first control winding and the second control winding are equal in turn number.
5. The magnetically controlled reactor based on pulse current control according to claim 1, characterized in that: the series resistor is a switchable resistor, and the switchable resistor is provided with multiple stages.
6. The pulse current control-based magnetically controlled reactor according to claim 1, characterized in that: the super capacitor is a farad capacitor, and the capacitance is 1-10F.
7. The pulse current control-based magnetically controlled reactor according to claim 1, characterized in that: the controllable bridge rectifier circuit is a thyristor bridge rectifier circuit.
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| CN115480610B (en) * | 2022-11-04 | 2023-03-21 | 国仪量子(合肥)技术有限公司 | Pulse signal conditioning circuit and electronic equipment |
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