CN109301883B - Double-stator synchronous phase modulator with energy stored in rotor and control method thereof - Google Patents
Double-stator synchronous phase modulator with energy stored in rotor and control method thereof Download PDFInfo
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- CN109301883B CN109301883B CN201811272397.4A CN201811272397A CN109301883B CN 109301883 B CN109301883 B CN 109301883B CN 201811272397 A CN201811272397 A CN 201811272397A CN 109301883 B CN109301883 B CN 109301883B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to a double-stator synchronous phase modulator with energy stored by a rotor, which comprises power electronic equipment and a phase modulator, wherein the power electronic equipment comprises an AC/DC converter and a DC/AC converter connected with the direct current side of the AC/DC converter, the phase modulator comprises a stator and a rotor, the stator comprises an outer stator and an inner stator, a switch is connected between one end of the outer stator and one end of the inner stator, a switch is connected between the other end of the outer stator and the other end of the inner stator, one end of the outer stator and the alternating current side of the AC/DC converter are connected with a power grid, and one end of the inner stator is connected with the alternating current side of the DC/AC converter. The invention also relates to a control method of the double-stator synchronous phase modulator with the rotor storing energy. The invention can carry out active compensation on the power grid under the conditions that the conventional reactive compensation function and the normal operation of the phase modulator are not influenced, the outer stator connected with the power grid keeps synchronous with the power grid and is constantly 50Hz, thereby expanding the application field of the phase modulator and being beneficial to the normal and stable work of the phase modulator in the power grid.
Description
Technical Field
The invention relates to the field of stable operation of a power system, in particular to a double-stator synchronous phase modulator with energy stored in a rotor and a control method thereof.
Background
The synchronous motor is an alternating current motor which needs to keep the rotating speed of a rotor and the rotating speed of a stator rotating magnetic field to be the same, in terms of physical structure, the stator and the rotor of a generator are two independent bodies which do not interfere with each other, the stator of the generator is an active source and generates induced electromotive force, the rotor of the generator is a reactive source, a winding introduces direct current from the outside to establish a magnetic field, voltage is established under the dragging of motive power and reactive power of alternating current is transmitted outwards, in terms of electromagnetic principle, the stator and the rotor are closely connected, and the active power and the reactive power of the generator are both output by the stator.
The synchronous phase modifier is essentially a synchronous motor which runs in a hanging network and does not have mechanical load, and is different from a synchronous motor in that a prime motor is not used for dragging, no mechanical load is arranged on a shaft, the synchronous phase modifier is connected to a power grid and runs in a no-load mode, and the synchronous phase modifier is mainly used for adjusting reactive power of the whole system and providing reactive support of the power grid. The phase modulator mainly adjusts the reactive output of the phase modulator by changing excitation. The voltage at the generator end of the generator set is adjusted by adjusting rotor excitation so as to control the reactive power of the generator set, when the phase modulator is in over-excitation operation, the exciting current is larger, the stator current lags behind the terminal voltage, and lagged reactive power is generated; when the phase modulator is in underexcited operation, the exciting current is reduced, the stator current is increased conversely, and the stator current is ahead of the terminal voltage to absorb reactive power. The synchronous phase modulator has the obvious advantages of large capacity, strong overload capacity, excellent transient performance, good controllability and the like, is suitable for wide application of extra-high voltage direct current stations, and meets a large amount of reactive support. In the work of the converter station, the phase modulator is used as a fast reactive support source and mainly bears fast reactive regulation and voltage support in the abnormal fluctuation process of the system voltage. The synchronous motor has the formation reasons that the rotating speed of a rotor is not consistent with the synchronous rotating speed of a stator rotating magnetic field any more, the rotating speed is reduced, and the synchronous motor enters an asynchronous running state, the synchronous motor is in power failure step loss, excitation step loss and field loss step loss.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a double-stator synchronous phase modulator with energy stored by a rotor and a control method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: a double-stator synchronous phase modulator with energy stored by a rotor comprises power electronic equipment and a phase modulator, wherein the power electronic equipment comprises an AC/DC converter and a DC/AC converter connected with the direct current side of the AC/DC converter, the phase modulator comprises a stator and a rotor, the stator comprises an outer stator and an inner stator, a switch is connected between one end of the outer stator and one end of the inner stator, and between the other end of the outer stator and the other end of the inner stator, one end of the outer stator and the alternating current side of the AC/DC converter are connected with a power grid, and one end of the inner stator is connected with the alternating current side of the DC/AC converter.
In a preferred embodiment of the present invention, the rotor energy storage double-stator synchronous phase modulator further comprises a DC capacitor disposed between the DC side of the AC/DC converter and the DC side of the DC/AC converter.
A control method of a double-stator synchronous phase modulator with energy stored in a rotor comprises the following steps:
(1) detecting whether the power grid has an active power loss condition in real time, and if so, executing the step (2); if not, executing the step (4);
(2) the phase modulator receives the active compensation signal, the two switches are disconnected, the outer stator and the inner stator which are connected in parallel work independently, a power supply output by a power grid is input into the inner stator after being subjected to frequency modulation by power electronic equipment, the magnetic field frequency of the outer stator is not changed at the moment of inputting the inner stator, but the rotating speed of the rotor is reduced due to the frequency difference to form a power angle, the mechanical energy on the upper part of the rotor is transferred to the outer stator and is converted into the electric energy on the outer stator, and a certain amount of active power is provided for the power grid;
(3) in the compensation process, power electronic equipment is required to keep the frequency of the outer stator constant at 50 Hz;
(4) the phase modulator works normally to perform reactive compensation on the power grid.
In a preferred embodiment of the present invention, the method for controlling a rotor energy storage double-stator synchronous phase modulation machine further comprises the step (3) of:
(3.1) tracking and detecting the rotor frequency and the outer stator frequency, firstly judging whether the outer stator frequency is 50Hz, and if so, executing the step (3.2); if not, executing the step (3.3);
(3.2) the inner stator does not work;
and (3.3) the power electronic equipment adjusts the frequency until the power grid sends a signal of compensation termination, the two switches are closed, the outer stator and the inner stator are restored to a parallel state, and the rotor gradually increases the speed and is restored to a normal rotating speed.
In a preferred embodiment of the present invention, the method for controlling a rotor energy storage double-stator synchronous phase modulator further comprises the step (3.3), wherein the frequency adjustment is to perform frequency conversion adjustment on a power supply output by a power grid, and input the power supply into an inner stator of the phase modulator.
In a preferred embodiment of the present invention, the control method of the rotor energy storage double-stator synchronous phase modulator further comprises the step of keeping the frequency of the mixed magnetic field of the inner stator and the rotor at 50Hz by frequency adjustment and acting together in the outer stator.
The invention solves the defects in the background technology, the invention has the function of active compensation to the power grid under the condition that the action of the phase modulator is not influenced, the conventional reactive compensation action and the normal operation are carried out, the outer stator connected with the power grid keeps synchronous with the power grid and is always 50Hz, and the frequency modulation link is arranged on the stator, thereby not influencing the response speed of the modulation and meeting the requirement of larger regulation amount.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the rotational speed of the outer stator, the inner stator and the rotor of the preferred embodiment of the present invention;
FIG. 3 is a transition diagram of a phase modulator from a synchronous motor state to a generator state in accordance with a preferred embodiment of the present invention;
in the figure: 10. AC/DC converter, 12, DC/AC converter, 14, outer stator, 16, inner stator, 18, rotor, 20, switch, 22, electric network.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings and examples, which are simplified schematic drawings and illustrate only the basic structure of the invention in a schematic manner, and thus show only the constituents relevant to the invention.
As shown in fig. 1, a double-stator synchronous phase modulator with rotor energy storage comprises power electronic equipment and a phase modulator, wherein the power electronic equipment comprises an AC/DC converter 10 and a DC/AC converter 12 connected with the direct current side of the AC/DC converter 10, the phase modulator comprises an outer stator 14, an inner stator 16 and a rotor 18, a switch 20 is connected between one end of the outer stator 14 and one end of the inner stator 16, and between the other end of the outer stator 14 and the other end of the inner stator 16, one end of the outer stator 14 and the alternating current side of the AC/DC converter 10 are connected with a power grid 22, and one end of the inner stator 16 is connected with the alternating current side of the DC/AC converter 12.
In order to reduce adverse factors, the invention preferably arranges a direct current capacitor 24 between the direct current side of the AC/DC converter 10 and the direct current side of the DC/AC converter 12, and filters partial harmonic components through the combined action of the AC/DC converter 10, the DC/AC converter 12 and the direct current capacitor 24.
The phase modulator can achieve reactive compensation and active compensation, the reactive compensation part is regulated and controlled unchanged, the reactive compensation part is regulated and controlled through the excitation regulation part, the active compensation can be achieved through the power electronic part, the stator has the characteristic of large capacity, a wide compensation environment can be achieved, the rotor has small capacity, the compensation is limited, and therefore the stator is selected as the active output part.
The phase modulator is a double stator structure, the outer stator 14 is a power winding, the inner stator 16 is a control winding, and the frequency of the magnetic field of the inner stator 16 is controlled by adjusting the frequency of the input power supply by power electronics.
FIG. 2 is a schematic view of the rotational speed of the outer stator 14, inner stator 16 and rotor 18, where ω ispFor the rotational speed of the outer stator 14 (power winding), corresponding to a frequency fp，ωcIs the rotational speed of the inner stator 16 (control winding) and corresponds to a frequency fc，ωrFor the rotational speed of the rotor 18, corresponding to a frequency fc. Wherein the following relation is satisfied:
FIG. 3 is a transition diagram of a phase modulator from a synchronous motor state to a generator state, varying the magnitude of the power angle, and increasing the power angle such that
Advance in
The power angle and the corresponding electromagnetic power are both positive values, namely the axis of the main pole of the rotor 18 is ahead of the axis of the armature synthetic magnetic field along the rotation direction, so that the electromagnetic torque acting on the rotor 18 is of a braking property, the mechanical torque on the rotor 18 overcomes the electromagnetic torque of the braking action, the mechanical energy is converted into electric energy, the energy conversion is realized, and the output active power is realized by adjusting the size of the power angle. The phase modulator is in two states, when a power grid normally runs, the phase modulator is used as reactive compensation equipment and runs in the state of a synchronous motor; when the power of the power grid is lost, the rotating speed of the rotor 18 changes along with the active compensation quantity, a certain power angle is formed, the rotor becomes a generator, and the phase modulator stably operates. The whole is compensatedThe phase modulator maintains two stable operation levels, one of which is synchronous operation and the other of which is stable operation after a power angle formed according to the compensation amount.
When the phase modulator normally works, namely the power grid 22 does not have active power loss, the stator works together by connecting a plurality of windings in parallel, the power winding and the control winding are connected in parallel, the phase modulator normally works, at the moment, the states of the power winding and the control winding are the same, the two switches 20 are closed, the rotating speed frequency of the rotor 18 of the phase modulator is the same as the frequency of the stator, and the phase modulator is used as a reactive power compensation device. When active power is required to be output, a part of parallel windings in the stator are taken out and are connected with the side of a power grid 22 through power electronic equipment to form a control winding, the frequency of the outer stator 14 is different from that of the inner stator 16, the rotating speed of the rotor 18 is slowed to form a power angle, the phase modulator is converted from a motor state to a generator to generate active power to perform active compensation on the power grid 22, and then the frequency of the outer stator 14 is required to be constant at 50Hz and is required to be maintained by adjusting the frequency of the inner stator 16 through the power electronic equipment.
The invention discloses a control method of a double-stator synchronous phase modulator with energy stored by a rotor, which comprises the following steps:
(1) detecting whether the power grid has an active power loss condition in real time, and if so, executing the steps (2) - (5); if not, executing the step (6);
(2) the phase modulator receives the active compensation signal, the two switches are disconnected, the outer stator and the inner stator which are connected in parallel work independently, a power supply output by a power grid is input into the inner stator after being subjected to frequency modulation by power electronic equipment, the magnetic field frequency of the outer stator is not changed at the moment of inputting the inner stator, but the rotating speed of the rotor is reduced due to the frequency difference to form a power angle, the mechanical energy on the upper part of the rotor is transferred to the outer stator and is converted into the electric energy on the outer stator, and a certain amount of active power is provided for the power grid;
(3) during the compensation process, power electronics are required to keep the outer stator frequency constant at 50 Hz. Three magnetic fields exist in the whole phase modulator, the magnetic field generated by the rotor, the rotating magnetic field generated by the inner stator and the rotating magnetic field generated by the outer stator in an induction manner, and in the whole process, the constant value is kept to be 50Hz in the rotating magnetic field of the outer stator. Tracking and detecting the rotor frequency and the outer stator frequency, judging whether the outer stator frequency is 50Hz, and if so, executing the step (4); if not, executing the step (5);
(4) the inner stator does not work, and alternating current is not introduced into the inner stator;
(5) the power electronic equipment carries out frequency adjustment, carries out frequency conversion adjustment on a power supply output by a power grid, inputs the power supply into an inner stator of a phase modulator, namely carries out frequency modulation change on alternating current input into the inner stator, so that the frequency of a mixed magnetic field of the inner stator and a rotor is kept at 50Hz, the mixed magnetic field acts on an outer stator together, the frequency of the outer stator is kept at 50Hz until the power grid sends a signal of compensation termination, two switches are closed, the outer stator and the inner stator are restored to a parallel state, a control winding is connected into a power winding in parallel again, the stator works normally, the rotor gradually increases the speed and restores to a normal rotating speed, the stator and the rotor keep synchronous operation, the frequency is 50Hz, and the phase modulator works normally;
(6) the phase modulator works normally to perform reactive compensation on the power grid.
Wherein the signal of the power grid with the loss of active power can be received by the processor, the processor sends a signal of active power compensation to the phase modulator, and the processor controls the power electronic equipment to adjust the frequency of the alternating current input to the inner stator. The processor can be a single chip microcomputer or an ARM system.
When the phase modulator is operating normally, its operating characteristics are equivalent to those of a synchronous machine, and when the grid 22 is active, its operating characteristics are equivalent to those of a synchronous generator, generating active power. The invention determines whether to output active power to the power grid 22 according to the judgment of the operation condition of the power grid 22, the compensation is temporary, the switch 20 is closed again after the compensation is finished, and the stator is recovered to the parallel state to operate in the state of the synchronous motor when the synchronous phase modulator normally operates.
The present invention needs to monitor the operation condition of the whole system in real time and pay attention to the operation state quantities thereof, especially the power grid 22 active loss condition, the rotation speed of the rotor, the frequency of the inner stator magnetic field, the frequency of the outer stator magnetic field, and the state quantities of the switches (the actions of the two switches are simultaneous and the same, wherein, the switch closing state quantity is 1, and the switch opening state quantity is 0). The invention ensures reactive compensation by adjusting excitation, can also provide certain active compensation by adjusting power electronic equipment, and simultaneously controls the phase modulator to keep synchronous operation with a power grid under the condition of 50Hz power frequency, thereby ensuring the normal operation of the phase modulator.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. A double-stator synchronous phase modulator with energy stored in rotor,
the rotor energy storage double-stator synchronous phase modulator is characterized by comprising power electronic equipment and a phase modulator, wherein the power electronic equipment comprises an AC/DC converter and a DC/AC converter connected with the direct current side of the AC/DC converter;
the control method of the double-stator synchronous phase modulator with the energy stored in the rotor comprises the following steps;
step 1, detecting whether the power grid has an active power loss condition in real time, if so, executing step 2; if not, executing the step 4;
step 2, sending an active compensation signal to a phase modulator, receiving the active compensation signal by the phase modulator, disconnecting two switches, enabling an outer stator and an inner stator which are connected in parallel to work independently, inputting a power supply output by a power grid into the inner stator after frequency modulation of power electronic equipment, enabling the magnetic field frequency of the outer stator to be unchanged at the moment of inputting the inner stator, but enabling the rotating speed of a rotor to be reduced due to frequency difference to form a power angle, transferring mechanical energy on the rotor to the outer stator, converting the mechanical energy into electric energy on the outer stator, and providing a certain amount of active power for the power grid;
step 3, in the compensation process, the power electronic equipment is required to keep the frequency of the outer stator constant at 50 Hz;
step 3.1, tracking and detecting the rotor frequency and the outer stator frequency, firstly judging whether the outer stator frequency is 50Hz, and if so, executing step 3.2; if not, executing step 3.3;
step 3.2, the inner stator does not work;
3.3, the power electronic equipment adjusts the frequency until the power grid sends a signal of compensation termination, the two switches are closed, the outer stator and the inner stator recover to a parallel state, and the rotor gradually increases the speed and recovers to a normal rotating speed;
and 4, normally working the phase modulator to perform reactive compensation on the power grid.
2. A rotor energy storage twin stator synchronous phase modulator as claimed in claim 1 wherein a DC capacitor is provided between the DC side of said AC/DC converter and the DC side of said DC/AC converter.
3. The double-stator synchronous phase modulator of claim 1, wherein in step 3.3, the frequency adjustment is to perform frequency conversion adjustment on the power output by the power grid, and input the power into the inner stator of the phase modulator.
4. A rotor energy storage double stator synchronous phase modulator as claimed in claim 3 wherein the frequency adjustment maintains the frequency of the mixed magnetic field of the inner stator and the rotor at 50Hz and acts in combination in the outer stator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811272397.4A CN109301883B (en) | 2018-10-30 | 2018-10-30 | Double-stator synchronous phase modulator with energy stored in rotor and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811272397.4A CN109301883B (en) | 2018-10-30 | 2018-10-30 | Double-stator synchronous phase modulator with energy stored in rotor and control method thereof |
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| CN109301883B true CN109301883B (en) | 2021-09-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109687473B (en) * | 2019-02-18 | 2021-06-15 | 国网山东省电力公司电力科学研究院 | Composite dynamic power support system and method thereof |
| CN112865129B (en) * | 2021-04-08 | 2023-03-28 | 哈尔滨理工大学 | Static phase modifier |
| CN113315137B (en) * | 2021-05-28 | 2022-09-13 | 哈尔滨工业大学 | Three-phase hybrid excitation synchronous phase modulator system |
| CN114679027B (en) * | 2022-05-27 | 2022-09-20 | 华中科技大学 | Multi-disc axial magnetic flux energy storage phase modulator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87217235U (en) * | 1987-12-30 | 1988-07-27 | 上海现代信息技术研究所 | Axial air-gap synchronous motor with consentric construction |
| CN1595772A (en) * | 2004-07-14 | 2005-03-16 | 华中科技大学 | Energy-storing phase modulation motor |
| CN102545501A (en) * | 2012-01-19 | 2012-07-04 | 东南大学 | Axial dual-stator brushless double-fed motor |
| CN106712420A (en) * | 2016-11-30 | 2017-05-24 | 上海电机学院 | Permanent magnet synchronous motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9847640B2 (en) * | 2014-07-31 | 2017-12-19 | General Electric Company | Synchronous condenser |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87217235U (en) * | 1987-12-30 | 1988-07-27 | 上海现代信息技术研究所 | Axial air-gap synchronous motor with consentric construction |
| CN1595772A (en) * | 2004-07-14 | 2005-03-16 | 华中科技大学 | Energy-storing phase modulation motor |
| CN102545501A (en) * | 2012-01-19 | 2012-07-04 | 东南大学 | Axial dual-stator brushless double-fed motor |
| CN106712420A (en) * | 2016-11-30 | 2017-05-24 | 上海电机学院 | Permanent magnet synchronous motor |
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