CN113410847B - Excitation control method of asynchronous phase modulator - Google Patents
Excitation control method of asynchronous phase modulator Download PDFInfo
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- CN113410847B CN113410847B CN202110892186.6A CN202110892186A CN113410847B CN 113410847 B CN113410847 B CN 113410847B CN 202110892186 A CN202110892186 A CN 202110892186A CN 113410847 B CN113410847 B CN 113410847B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1892—Arrangements for adjusting, eliminating or compensating reactive power in networks the arrangements being an integral part of the load, e.g. a motor, or of its control circuit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses an excitation control method of an asynchronous phase modulator, and belongs to the technical field of safe operation of power systems. The invention aims at the problem that the existing asynchronous phase modulator control method cannot meet the requirements of rapidness and accuracy. The method comprises the steps of obtaining a voltage instantaneous amplitude value of a preset duration in a stable state; judging a voltage amplitude interval in which the voltage instantaneous amplitude set U is positioned; when the voltage instantaneous amplitude set U obtained within the preset time duration is maintained in the same voltage amplitude interval, adjusting the working mode of the asynchronous phase modulator; the invention realizes the accuracy and the intellectualization of the control of the asynchronous phase modulator, meets the reactive power and the inertia required in a power system, and has the advantages of rapidness, stability, safety and intelligence.
Description
Technical Field
The invention relates to the field of safe operation of power systems, in particular to an excitation control method of an asynchronous phase modulator.
Background
With the rise of new energy power generation technology and the rise of clean energy position day by day at home and abroad, the proportion of the traditional thermal power generation is further reduced day by day. According to data statistics and prediction conditions of international energy organization, the proportion of domestic wind power generation, photovoltaic power generation, hydroelectric power generation and nuclear power generation is increased by 50% after ten years, so that rotating equipment such as thermal power generation in an electric power system is continuously reduced, and the inertia of the system is reduced. And the inertia of the system is insufficient, so that the power grid is not buffered by enough rotating equipment after being subjected to fault impact, and further some new energy power generation equipment are disconnected from the power grid, so that the power grid is subjected to unpredictable oscillation, and even the system is completely crashed. Aiming at the situation, the occurrence of the asynchronous phase modulator can make up the reactive power shortage of the power grid, and meanwhile, the inertia of the system can be properly increased, so that the problem of system safety caused by insufficient inertia is solved. However, the excitation control of the asynchronous phase modulator needs to have unique characteristics, so that the excitation control is required to meet the requirements of rapidness and accuracy.
Disclosure of Invention
In order to solve the problems, the invention provides an excitation control method of an asynchronous phase modulator, which maximally enhances the reactive characteristic and inertia characteristic of the asynchronous phase modulator in a power system.
The invention discloses an excitation control method of an asynchronous phase modulator, which comprises the following steps:
s1, setting a plurality of voltage amplitude intervals;
s2, judging whether the current working state of the asynchronous phase modulator is a stable state or not, and if so, executing a step S3;
s3, continuously acquiring voltage instant of the asynchronous phase modulator in a stable state within preset time lengthAmplitude set U = { U = { (U) } 1 ，u 2 ，u 3 ，…，u n Judging a voltage amplitude interval in which the voltage instantaneous amplitude set U is positioned;
s4, when the voltage instantaneous amplitude set U obtained within the preset time is maintained in the same voltage amplitude interval, executing the step S5;
s5, adjusting the working mode of the asynchronous phase modulator according to the voltage amplitude interval in which the voltage instantaneous amplitude set U is positioned in the step S3;
and S6, repeatedly executing the step S2.
Preferably, the amplitude interval includes 2m +1, which is sequentially:
interval 1: (0, (1-k) 1 )u 0 ) And the interval 2: ((1-k) 1 )u 0 ，(1-k 2 )u 0 ) 8230the interval m: ((1-k) m-1 )u 0 ，(1-k m )u 0 ) The interval m +1: [ (1-k) m )u 0 ，(1+k m )u 0 ]And the interval m +2: ((1 k) m )u 0 ，(1+k m-1 )u 0 ) \8230, interval 2m +1: ((1 k) 1 )u 0 ，1+u 0 ) Wherein u is 0 The standard value is the steady state standard value of the asynchronous phase modulator.
Preferably, k is m Has a range of (0,0.3)]。
Preferably, the working modes of the asynchronous phase modulators corresponding to the amplitude intervals are mode 1, mode 2, \8230, mode m +1, mode m +2 and mode 2m +1 in sequence; the operating mode includes adjusting the frequency and slip of the three-phase excitation voltage of the asynchronous phase modulator.
Preferably, the interval m +1: ((1-k) m )u 0 ，(1+k m )u 0 ) The corresponding working modes are as follows: the three-phase excitation voltage of the asynchronous phase modulator is direct current, and the slip ratio is 0 at the moment.
Preferably, the preset time duration is at least the time duration of three standard periods.
As described above, the excitation control method for an asynchronous condenser according to the present invention has the following effects:
the excitation control method for the asynchronous phase modulator provided by the invention has the advantages that the excitation frequency is adjusted and controlled by distinguishing the change of the voltage component in the power grid while the asynchronous phase modulator serves as a reactive power supply in the power grid, so that the motor can have corresponding output in a certain range, and finally, the safe and stable operation of a power system is realized.
The invention combines the practical operation condition of the phase modifier in the power grid according to the reactive characteristic of the asynchronous operation of the phase modifier, adopts a sectional interval control mode, meets the reactive power required in a power system, can further realize the change of the rotating speed by changing the slip ratio, and realizes the conversion of kinetic energy, when the rotating speed is reduced, the rotor of the asynchronous phase modifier can quickly release the rotating kinetic energy of the rotor, a certain amount of active power can be provided for the system through the conversion, and the calculation can know that the slip ratio of the asynchronous phase modifier of 20Mvar is converted from 0.08 to-0.08, and after 20 percent of energy loss, the active power of about 1.6MW is provided for the system, and is about 8 percent of the rated capacity. Therefore, the excitation control method provided by the invention can be used as an inertia supplementary source of the rotating equipment primarily, and more intelligent excitation control of the asynchronous phase modulator is realized so as to protect the safe operation of the power system.
Drawings
FIG. 1 is a flow chart of a method of an embodiment of the present invention.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
As shown in fig. 1, the excitation control method for an asynchronous condenser provided by the present invention in this embodiment includes:
s1, setting a plurality of voltage amplitude intervals;
the voltage amplitude interval is divided according to a series of factors such as operating conditions, reactive capacity reserve, system performance bias and the like, and in the practical application process, the voltage amplitude interval can be adjusted according to needs.
The amplitude interval includes 2m +1, which in turn is:
interval 1: (0, (1-k) 1 )u 0 ) And the interval 2: ((1-k) 1 )u 0 ，(1-k 2 )u 0 ) 8230, interval m: ((1-k) m-1 )u 0 ，(1-k m )u 0 ) And the interval m +1: [ (1-k) m )u 0 ，(1+k m )u 0 ]And the interval m +2: ((1 k) m )u 0 ，(1+k m-1 )u 0 ) \8230, interval 2m +1: ((1 + k) 1 )u 0 ，1+u 0 ) Wherein u is 0 The motor is a steady-state standard value of the asynchronous phase modulator, and the steady-state standard value is a parameter of the motor which is always in steady-state synchronous operation.
Limited by economic efficiency and existing technical conditions, preference is given to k m Has a range of (0, 0.3)]And the reliable control of the asynchronous phase modulator and the quick conversion of the working mode are realized.
In one embodiment of the present application, m is 3,k, which is selected according to the designed operating conditions of the 20Mvar asynchronous phase modulation machine and the expected environment of the machine 1 Is 0.3,k 2 Is 0.2,k 3 Is 0.1, namely the amplitude interval comprises 7 intervals, so that the phase modulator is in a linear regulation area and can rapidly act to regulate the system voltage. If the capacity of the new energy power plant and the phase modifier is changed, the line impedance is changedThe selection of the parameter is influenced by the load change, the sensitivity reliability conversion and the like, and then the following parameters are obtained in each interval:
the region 1 is (0,0.7u) 0 ) And interval 2 is [0.7u ] 0 ，0.8u 0 ) And interval 3 is [0.8u ] 0 ，0.9u 0 ) And interval 4 is [0.9u ] 0 ，1.1u 0 ]And interval 5 is (1.1 u) 0 ，1.2u 0 ) And the interval 6 is [1.2u ] 0 ，1.3u 0 ) And the interval 7 is [1.3u ] 0 ，2u 0 )。
S2, judging whether the current working state of the asynchronous phase modulator is a stable state or not, and if so, executing a step S3;
when the asynchronous phase modulator is in a stable state, a subsequent working mode conversion program is triggered, otherwise, the asynchronous phase modulator keeps the current working mode.
S3, continuously acquiring a voltage instantaneous amplitude set U = { U = of the asynchronous phase modulator in a stable state within a preset time length 1 ，u 2 ，u 3 ，…，u n In which u i Determining the voltage amplitude interval where the voltage instantaneous amplitude set U is located as the ith voltage instantaneous amplitude; the instantaneous amplitude u i The obtaining method comprises the following steps: extracting voltage parameters from a power grid, and obtaining amplitude parameters of alternating current excitation through the voltage parameters, namely the instantaneous amplitude u i 。
The instantaneous voltage amplitude may fluctuate, when the obtained voltage amplitude fluctuates in different amplitude intervals, a delay control mode is adopted at the moment, the current working mode is kept unchanged, and when the obtained voltage amplitude value is maintained in the same voltage amplitude interval within a preset time period and reaches a preset time, the working mode of the asynchronous phase modulator is changed, so that the excitation control system can be prevented from changing the working mode for multiple times within a short time to generate oscillation. In this embodiment, the preset duration is a duration of three standard periods, the standard period is a period during which the asynchronous phase modulator operates in a steady state, and since a general transient process time is short, the duration of one period may be attenuated to within a rated capacity of the phase modulator.
S4, when the voltage instantaneous amplitude set U obtained within the preset time length is maintained in the same voltage amplitude interval, executing the step S5;
s5, adjusting the working mode of the asynchronous phase modulator according to the voltage amplitude interval in which the voltage instantaneous amplitude set U is positioned in the step S3;
the working modes of the asynchronous phase modulator corresponding to the voltage amplitude interval are mode 1, mode 2, \ 8230, mode m, mode m +1, mode m +2 and mode 2m +1 in sequence; in different working modes, the frequency and the slip of the three-phase excitation voltage of the asynchronous phase modulator are adjusted. In order to ensure efficiency, the closer the slip is to 0 indicates that the closer the rotation speed is to the synchronous speed, the better, the excitation frequency and the slip are in one-to-one correspondence, the excitation frequency of the excitation frequency also increases with the increase of the slip and decreases with the decrease of the slip. In a specific working mode, the rotating speed of the rotor can be obtained by utilizing the slip ratio, the frequency of the rotor is further obtained, the motor can stably run by adjusting the excitation frequency to enable the sum of the rotor frequency and the excitation frequency to be equal to the stator frequency, and the process is completed through a power electronic device and a frequency converter.
Interval m +1: ((1-k) m )u 0 ，(1+k m )u 0 ) The corresponding working modes are as follows: the three-phase excitation voltage of the asynchronous phase modulator is direct current, the slip is 0 at the moment, namely in the voltage amplitude interval, the slip does not need to be converted, and the voltage adjustment of the system can be completed only by the excitation amplitude of the equipment.
The working modes corresponding to the 7 amplitude intervals in the above embodiment are respectively:
interval 1 is (0,0.7u) 0 ) The corresponding mode 1 is: setting the frequency of the three-phase excitation voltage of the asynchronous phase modulator to be-4.5 Hz, and setting the slip ratio to be-0.9 at the moment;
interval 2 is [0.7u ] 0 ，0.8u 0 ) The corresponding mode 2 is: setting the frequency of the three-phase excitation voltage of the asynchronous phase modulator to be-3 Hz, and setting the slip ratio to be-0.6 at the moment;
interval 3 is [0.8u ] 0 ，0.9u 0 ) The corresponding mode 3 is: setting the frequency of three-phase excitation voltage of asynchronous phase modulator to-1.5 Hz, at this time rotatingThe difference rate is-0.3;
interval 4 is [0.9u ] 0 ，1.1u 0 ]The corresponding mode 4 is: setting the three-phase excitation voltage of the asynchronous phase modulator as direct current, wherein the slip ratio is 0;
the interval 5 is (1.1 u) 0 ，1.2u 0 ) The corresponding mode 5 is: setting the frequency of three-phase excitation voltage of the asynchronous phase modulator to be 1.5Hz, and setting the slip ratio to be 0.3 at the moment;
the interval 6 is [1.2u ] 0 ，1.3u 0 ) The corresponding pattern 6 is: setting the frequency of three-phase excitation voltage of the asynchronous phase modulator to be 3Hz, wherein the slip ratio is 0.6;
the interval 7 is [1.3u ] 0 ，2u 0 ) The corresponding pattern 7 is: the frequency of the three-phase excitation voltage of the asynchronous phase modulator was set to 4.5Hz, at which time the slip was 0.9.
In the above working modes, the positive and negative of the excitation frequency correspond to the super-synchronous state and the sub-synchronous state of the phase modulator, respectively, that is, whether the excitation voltage rotating magnetic field leads the physical rotation speed of the rotor or lags behind the physical rotation speed of the rotor, and in short, the negative number represents that the excitation magnetic field lags behind the rotation speed of the rotor.
And S6, repeatedly executing the step S2.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (6)
1. An excitation control method of an asynchronous phase modulator is characterized by comprising the following steps:
s1, setting a plurality of voltage amplitude intervals;
s2, judging whether the current working state of the asynchronous phase modifier is a stable state or not, and if so, executing the step S3;
s3, continuously acquiring within preset time lengthThe voltage instantaneous amplitude set U = { U } of the asynchronous phase modulator in a steady state 1 ，u 2 ，u 3 ，…，u n Judging a voltage amplitude interval in which the voltage instantaneous amplitude set U is positioned;
s4, when the voltage instantaneous amplitude set U obtained within the preset time length is maintained in the same voltage amplitude interval, executing the step S5;
s5, adjusting the working mode of the asynchronous phase modulator according to the voltage amplitude interval where the voltage instantaneous amplitude set U is located in the step S3;
and S6, repeatedly executing the step S2.
2. The excitation control method of an asynchronous phase modulator according to claim 1, wherein said amplitude interval includes 2m +1, which in turn is:
interval 1: (0, (1-k) 1 )u 0 ) And interval 2: ((1-k) 1 )u 0 ，(1-k 2 )u 0 ) 8230, interval m: ((1-k) m-1 )u 0 ，(1-k m )u 0 ) And the interval m +1: [ (1-k) m )u 0 ，(1+k m )u 0 ]The interval m +2: ((1 + k) m )u 0 ，(1+k m-1 )u 0 ) \8230, interval 2m +1: ((1 + k) 1 )u 0 ，1+u 0 ) Wherein u is 0 The steady state standard value of the asynchronous phase modulator.
3. The excitation control method of an asynchronous phase modulator according to claim 1, wherein k is k m Has a range of (0,0.3)]。
4. The excitation control method of the asynchronous phase modulator according to claim 2, wherein the working modes of the asynchronous phase modulator corresponding to the amplitude interval are mode 1, mode 2, \ 8230, mode m, mode m +1, mode m +2, mode 2m +1; the working mode comprises adjusting the frequency and slip of the three-phase excitation voltage of the asynchronous phase modulator.
5. The excitation control method of an asynchronous phase modulator according to claim 4, characterized in that the interval m +1: ((1-k) m )u 0 ，(1+k m )u 0 ) The corresponding working modes are as follows: the three-phase excitation voltage of the asynchronous phase modulator is direct current, and the slip ratio is 0 at the moment.
6. The excitation control method of an asynchronous phase modulator according to claim 1, characterized in that said preset duration is at least the duration of three standard periods.
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| CN106026122B (en) * | 2016-06-24 | 2018-11-02 | 河海大学 | A kind of method that asynchronous excitation integrates phase modifier and its reactive-load compensation and active balance |
| JP6521325B2 (en) * | 2016-06-27 | 2019-05-29 | 東芝三菱電機産業システム株式会社 | Voltage stabilization device and control method thereof |
| CN107947186B (en) * | 2017-11-23 | 2021-06-18 | 国网江苏省电力有限公司检修分公司 | Starting control method for accessing high-voltage direct-current transmission inversion side to synchronous phase modulator |
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| CN101795007A (en) * | 2010-03-18 | 2010-08-04 | 清华大学 | Stator power control method of wind-power double-feed motor based on synchronization model |
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