CN102928697A - Low-frequency-band damping detection method and system of PSS2A (Power System Stabilizer 2A) model of excitation regulator - Google Patents

Low-frequency-band damping detection method and system of PSS2A (Power System Stabilizer 2A) model of excitation regulator Download PDF

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CN102928697A
CN102928697A CN2012104013976A CN201210401397A CN102928697A CN 102928697 A CN102928697 A CN 102928697A CN 2012104013976 A CN2012104013976 A CN 2012104013976A CN 201210401397 A CN201210401397 A CN 201210401397A CN 102928697 A CN102928697 A CN 102928697A
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pss2a
field regulator
damping
frequency
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CN102928697B (en
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张俊峰
李鹏
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China Southern Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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China Southern Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Abstract

The invention provides a low-frequency-band dampness detection method and system of a PSS2A (Power System Stabilizer 2A) model of an excitation regulator. The low-frequency-band damping detection method comprises the following steps of: changing a rotational inertia of a power generator in a pre-built network access detection platform of the excitation regulator to ensure that the local oscillation frequency of a disturbed unit continuously changes to excite a full-frequency-band oscillation mode; carrying out power generator disturbance test respectively under the condition that the excitation regulator enters into and exits from the PSS2A model, and respectively recording the disturbance test waveforms of the unit under the condition that the PPS2A enters and exits; and comparing the oscillating waveforms of active power of the power generator under the same local oscillation frequency, and judging whether the PSS2A model of the excitation regulator provides negative dampness. According to the low-frequency-band dampness detection method and system disclosed by the invention, the difficulty of detecting the potential safety hazards of the PSS2A model of the excitation regulator is solved and safe and stable operation of a power grid can not be endangered.

Description

Field regulator PSS2A model low-frequency range damping detection method and system
Technical field
The present invention relates to the power system dynamic stability field, particularly relate to a kind of field regulator PSS2A model low-frequency range damping detection method and a kind of field regulator PSS2A model low-frequency range damping detection system.
Background technology
The PSS2A model also is accelerating power type PSS(Power System Stabilizer, power system stabilizer, PSS).The generator amature equation of motion represents that with perunit value when velocity variations was little, available horsepower replaced torque, and then relational expression is:
M ω 0 dω dt = P m - P e
In the following formula: M is the moment of inertia of machine group rotor; P mMechanical output for generator; P eElectric power for generator; ω is the axle speed of generator.
Have after the transposition:
P m = M ω 0 dω dt + P e
Write as the deviation form, d/dt replaces with S, obtains the departure of mechanical output:
ΔP m = Ms Δω ω 0 + Δ P e
Because containing various noises among the Δ ω, G (s) elimination noise effect is taken advantage of at the following formula two ends:
Δ P m G ( s ) = ( Ms Δω ω 0 + Δ P e ) G ( s )
Accelerating power is:
Δ P a = ( M sΔω ω 0 + Δ P e ) G ( s ) - Δ P e
In the formula, Δ P aAccelerating power deviation for generator.
Use Δ P aBe used as the input of PSS, then the block diagram of PSS2A is transferred less than anti-with the PSS of accelerating power as input signal just as shown in Figure 1 in theory.
Think that by above theoretical analysis the PSS2A model is a kind of theoretic accelerating power type PSS, its advantage is the anti-accent problem that has solved the PSS1A model.But the key that also can find out the PSS2A model from the theoretical analysis of PSS2A model is that it finds the solution the departure Δ P of mechanical output mIf, Δ P mFind the solution mistake, then may play opposite effect, namely the PSS2A model provides negative damping.As everyone knows, in the power system dynamic stability field, if system damping for just, then this system is stable; If system damping is weak or be negative damping, then this system is unsettled, shakes to disperse.
At present, what generator angular velocity omega signal adopted among Fig. 1 is that the equivalent theory computing method are obtained, and is not actual measurement generator speed signal.Therefore, calculating Δ P mThe time have the inaccurate and noise signal large two large defectives of ω calculated signals, this also is the crucial difficult point that perplexs the success or failure of PSS2A model.In order to solve above-mentioned noise problem, the Δ P to calculating in the PSS2A model mCarry out G (s) filtering and process, this filter function is equivalent to multistage low-pass filtering link, and the signal of the local oscillation pattern 1.2 ~ 1.5Hz that inspires in can the PSS process of the test to routine carries out larger decay, so Δ P mFinding the solution inaccurate problem has also covered up.Such a case so occurred, namely (common frequency scope 1.2Hz ~ 1.5Hz) lower PSS2A model provides positive damping in the local oscillation pattern; But the low-frequency range at inter-area oscillation mode (frequency is less than 0.5Hz) then provides negative damping, and the vibration of aggravation system threatens security of system stable operation.
Actual field regulator hanging net operation, the test method of PSS test guidance regulation can only excite the machine concussion pattern, therefore can only detect the damping of PSS2A under the machine concussion pattern, can not detect the PSS2A model at the damping of low-frequency range, whether also just can not investigate exists the ω signal to find the solution inaccurate potential safety hazard, concussion pattern between can't simulation region in system, and electrical network does not move and interval concussion pattern occurs.Therefore, the PSS2A model can't be detected during site test and whether effective positive damping can be provided in low-frequency range.
Summary of the invention
Whether based on this, being necessary can provide effective positive damping for the above-mentioned PSS2A model that can't detect in low-frequency range, thereby to the problem that system brings potential safety hazard, provides a kind of field regulator PSS2A model low-frequency range damping detection method and system.
For achieving the above object, the present invention adopts following technical scheme:
A kind of field regulator PSS2A model low-frequency range damping detection method may further comprise the steps:
In the networking detection platform of the field regulator of putting up in advance, change the moment of inertia of generator, so that be subjected to that the local oscillation frequency of unit continuously changes after the disturbance, excite the mode of oscillation of full frequency band;
Drop into, withdraw from field regulator respectively in the situation of PSS2A model and carry out the generator upset test, and record respectively the PSS2A model and drop into, withdraw from the unit upset test waveform in the situation;
Contrast the waveform of generator active power under the identical local oscillation frequency, judge whether the PSS2A model of described field regulator provides negative damping.
A kind of field regulator PSS2A model low-frequency range damping detection system comprises:
The parameter modification module is used for the networking detection platform at the field regulator of putting up in advance, changes the moment of inertia of generator, so that be subjected to that the local oscillation frequency of unit continuously changes after the disturbance, excites the mode of oscillation of full frequency band;
Logging modle is used for dropping into, to withdraw from field regulator respectively in the situation of PSS2A model and carries out the generator upset test, and records respectively the PSS2A model and drop into, withdraw from the unit upset test waveform in the situation;
Judge module for the waveform that contrasts generator active power under the identical local oscillation frequency, judges whether the PSS2A model of described field regulator provides negative damping.
Can be found out by above scheme, field regulator PSS2A model low-frequency range damping detection method of the present invention and system, basic theories from the PSS2A model, built the networking detection platform of field regulator, true action situation and damping thereof to the PSS2A model of field regulator have carried out the full frequency band detection, can excite on the basis of the uncompensated characteristic that does not change unit the low frequency oscillation mode of unit, detect the PSS2A model of field regulator at the damping of low-frequency range, thus the potential safety hazard of the PSS2A model of investigation field regulator.The potential safety hazard that the solution of the present invention has solved the PSS2A model of adjustment of field excitation detects a difficult problem, and does not jeopardize the safe and stable operation of electrical network, therefore has preferably application prospect.
Description of drawings
Fig. 1 is the PSS2A model framework chart;
Fig. 2 is the schematic flow sheet of a kind of field regulator PSS2A model low-frequency range damping detection method in the embodiment of the invention;
Fig. 3 is RTDS device and adjustment of field excitation apparatus closed-loop control block diagram;
Fig. 4 is one machine infinity bus system model synoptic diagram;
Fig. 5 is multimachine Infinite bus system model synoptic diagram;
Fig. 6 provides positive damping effect synoptic diagram for PSS2A;
Fig. 7 provides negative damping effect synoptic diagram for PSS2A;
Fig. 8 is the structural representation of a kind of field regulator PSS2A model low-frequency range damping detection system in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical scheme of the present invention is further described.
Referring to shown in Figure 2, a kind of field regulator PSS2A model low-frequency range damping detection method may further comprise the steps:
Step S101 in the networking detection platform of the field regulator of putting up in advance, changes the moment of inertia H of generator, so that be subjected to that the local oscillation frequency of unit continuously changes after the disturbance, excites the mode of oscillation of full frequency band, then enters step S102.
As an embodiment preferably, above-mentioned networking detection platform of building in advance mainly comprises hardware platform and software platform.Wherein: described hardware platform can comprise: RTDS(Real Time Digital Simulator, real-timedigital simulation instrument) device, power amplifier, field regulator etc.; Described RTDS device, power amplifier, field regulator connect successively and form closed-loop control, therefore when realizing the present invention program, at first need to realize the interconnected of RTDS device and field regulator.
Carry out for the ease of work, among the present invention the closed-loop control of field regulator and RTDS is simplified, the controllable silicon (power cabinet) that has omitted field regulator triggers link and controllable silicon anode voltage detection, and the closed-loop control block diagram of the field regulator of building and RTDS device as shown in Figure 3.Wherein: in the dotted line frame is generator model and exciter model in the RTDS device, VM refers to stator voltage one sub-value of generator, and IM refers to stator current one sub-value of generator, two sub-values of Ut generator unit stator voltage, It refers to two sub-values of generator unit stator electric current, exciting current (I F) refer to the exciting current of generator.Power amplifier is that the weak electric signal of RTDS device output is converted into voltage transformer (VT) (PT), the consistent forceful electric power signal of current transformer (CT) output with actual power plant, so the generator unit stator voltage, stator current two sub-values that receive in field regulator the signal Ut, the It that receive and the actual motion are consistent.The field regulator here refers to actual adjustment of field excitation apparatus.
In addition, described software platform can comprise: the closed-loop control logic of the electric network model of building in described RTDS device and model parameter, RTDS device and field regulator etc.Because the emphasis of the present invention research is the field regulator device performance, therefore as an embodiment preferably, the electric network model of building in the RTDS device can be reduced to simple one machine infinity bus system model or multimachine Infinite bus system model.The one machine infinity bus system model of building among the present invention and multimachine Infinite bus system model are respectively such as Fig. 4, shown in Figure 5.Multimachine Infinite bus system model with Fig. 5 describes: #1oo and #2oo are Infinite bus system, and #1 and #2 incorporate the 500kV system into, and #3 and #4 unit are incorporated the 220kV system into; #1 adopts identical generator parameter with the #2 unit, and #3 adopts identical generator parameter with the #4 unit; Field regulator to be detected can be realized closed-loop control with any unit, other units adopt self-defining field regulator model, can realize the operating mode that unit operation or multimachine move simultaneously by switching over, substantially can satisfy the networking testing demand of field regulator.
As an embodiment preferably, the model parameter in the described software platform can adopt the parameter of actual set, also can adopt the classical model parameter.
As an embodiment preferably, the mode of oscillation of full frequency band among the present invention comprises the whole frequency range of 0.2 ~ 2Hz.
Step S102 drops into, withdraws from field regulator respectively in the situation of PSS2A model and carry out the generator upset test, and records respectively the PSS2A model and drop into, withdraw from the unit upset test waveform in the situation, then enters step S103.
Step S103 contrasts the waveform of generator active power under the identical local oscillation frequency, judges whether the PSS2A model of described field regulator provides negative damping.
Referring to Fig. 6, shown in Figure 7 be the unit upset test waveform effect synoptic diagram that step S102 records, can judge that according to this waveform effect synoptic diagram the PSS2A model that draws field regulator provides positive damping and also provides negative damping.As an embodiment preferably, describedly judge whether to provide the process of negative damping specifically can comprise: the waveform of generator active power under the identical local oscillation frequency is compared, if the generator active power number of oscillation that draws in the PSS2A model input situation by contrast withdraws from the generator active power number of oscillation in the situation less than the PSS2A model, judge that then the PSS2A model provides positive damping; If the generator active power number of oscillation in the PSS2A model input situation withdraws from the generator active power number of oscillation in the situation greater than the PSS2A model, judge that then the PSS2A model provides negative damping.
Be illustrated in figure 6 as PSS2A the effect synoptic diagram of positive damping is provided, wherein, Curve1 is that PSS2A withdraws from the generator active power curve of cyclical fluctuations in the situation, and Curve2 is the generator active power curve of cyclical fluctuations in the PSS2A input situation.In addition, Fig. 7 provides the effect synoptic diagram of negative damping for PSS2A, and wherein, Curve1 is that PSS2A withdraws from the generator active power curve of cyclical fluctuations in the situation, and Curve2 is the generator active power curve of cyclical fluctuations in the PSS2A input situation.
If (in 0.2 ~ 2.0Hz), PSS2A all provides positive damping, illustrates that then there is not potential safety hazard in the PSS2A of this field regulator in whole frequency range; Otherwise, provide negative damping if in whole frequency range, have more than or equal to PSS2A under 1 oscillation frequency, illustrate that then there is potential safety hazard in the PSS2A of this field regulator.
In addition, corresponding with above-mentioned a kind of field regulator PSS2A model low-frequency range damping detection method, the present invention also provides a kind of field regulator PSS2A model low-frequency range damping detection system, and referring to shown in Figure 8, this system comprises:
Parameter modification module 101 is used for the networking detection platform at the field regulator of putting up in advance, changes the moment of inertia of generator, so that be subjected to that the local oscillation frequency of unit continuously changes after the disturbance, excites the mode of oscillation of full frequency band;
Logging modle 102 is used for dropping into, to withdraw from field regulator respectively in the situation of PSS2A model and carries out the generator upset test, and records respectively the PSS2A model and drop into, withdraw from the unit upset test waveform in the situation;
Judge module 103 for the waveform that contrasts generator active power under the identical local oscillation frequency, judges whether the PSS2A model of described field regulator provides negative damping.
As an embodiment preferably, state judge module 103 and can comprise positive damping detection module and negative damping detection module;
If described positive damping detection module is used for withdrawing from the generator active power number of oscillation in the situation by the generator active power number of oscillation that contrast draws in the PSS2A model input situation less than the PSS2A model, judge that then the PSS2A model provides positive damping;
If described negative damping detection module is used for withdrawing from the generator active power number of oscillation in the situation by the generator active power number of oscillation that contrast draws in the PSS2A model input situation greater than the PSS2A model, judge that then the PSS2A model provides negative damping.By judging that the PSS2A model provides positive damping and also provides negative damping, can guarantee security of system stable operation.
Other technical characterictic of a kind of field regulator PSS2A model low-frequency range damping detection system of the present invention is identical with above-mentioned a kind of field regulator PSS2A model low-frequency range damping detection method, and it will not go into details herein.
Can find out by above scheme, field regulator PSS2A model low-frequency range damping detection method of the present invention and system, basic theories from the PSS2A model, built the networking detection platform of field regulator, true action situation and damping thereof to the PSS2A model of field regulator have carried out the full frequency band detection, can excite on the basis of the uncompensated characteristic that does not change unit the low frequency oscillation mode of unit, detect the PSS2A model of field regulator at the damping of low-frequency range, thus the potential safety hazard of the PSS2A model of investigation field regulator.The potential safety hazard that the solution of the present invention has solved the PSS2A model of adjustment of field excitation detects a difficult problem, and does not jeopardize the safe and stable operation of electrical network, therefore has preferably application prospect.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (8)

1. a field regulator PSS2A model low-frequency range damping detection method is characterized in that, may further comprise the steps:
In the networking detection platform of the field regulator of putting up in advance, change the moment of inertia of generator, so that be subjected to that the local oscillation frequency of unit continuously changes after the disturbance, excite the mode of oscillation of full frequency band;
Drop into, withdraw from field regulator respectively in the situation of PSS2A model and carry out the generator upset test, and record respectively the PSS2A model and drop into, withdraw from the unit upset test waveform in the situation;
Contrast the waveform of generator active power under the identical local oscillation frequency, judge whether the PSS2A model of described field regulator provides negative damping.
2. field regulator PSS2A model low-frequency range damping detection method according to claim 1 is characterized in that described networking detection platform comprises hardware platform, software platform;
Described hardware platform comprises: RTDS device, power amplifier, field regulator; Described RTDS device, power amplifier, field regulator connect successively and form closed-loop control;
Described software platform comprises: the closed-loop control logic of the electric network model of building in described RTDS device and model parameter, RTDS device and field regulator.
3. field regulator PSS2A model low-frequency range damping detection method according to claim 2 is characterized in that described electric network model is one machine infinity bus system model or multimachine Infinite bus system model.
4. field regulator PSS2A model low-frequency range damping detection method according to claim 2 is characterized in that, described model parameter adopts parameter or the classical model parameter of actual set.
5. field regulator PSS2A model low-frequency range damping detection method according to claim 1 is characterized in that, describedly judges whether to provide the process of negative damping to comprise:
If the generator active power number of oscillation that draws in the PSS2A model input situation by contrast withdraws from the generator active power number of oscillation in the situation less than the PSS2A model, judge that then the PSS2A model provides positive damping;
If the generator active power number of oscillation that draws in the PSS2A model input situation by contrast withdraws from the generator active power number of oscillation in the situation greater than the PSS2A model, judge that then the PSS2A model provides negative damping.
6. the described field regulator PSS2A of any one model low-frequency range damping detection method is characterized in that described full frequency band is the frequency range of 0.2 ~ 2Hz according to claim 1-5.
7. a field regulator PSS2A model low-frequency range damping detection system is characterized in that, comprising:
The parameter modification module is used for the networking detection platform at the field regulator of putting up in advance, changes the moment of inertia of generator, so that be subjected to that the local oscillation frequency of unit continuously changes after the disturbance, excites the mode of oscillation of full frequency band;
Logging modle is used for dropping into, to withdraw from field regulator respectively in the situation of PSS2A model and carries out the generator upset test, and records respectively the PSS2A model and drop into, withdraw from the unit upset test waveform in the situation;
Judge module for the waveform that contrasts generator active power under the identical local oscillation frequency, judges whether the PSS2A model of described field regulator provides negative damping.
8. field regulator PSS2A model low-frequency range damping detection system according to claim 7 is characterized in that described judge module comprises positive damping detection module, negative damping detection module;
If described positive damping detection module is used for withdrawing from the generator active power number of oscillation in the situation by the generator active power number of oscillation that contrast draws in the PSS2A model input situation less than the PSS2A model, judge that then the PSS2A model provides positive damping;
If described negative damping detection module is used for withdrawing from the generator active power number of oscillation in the situation by the generator active power number of oscillation that contrast draws in the PSS2A model input situation greater than the PSS2A model, judge that then the PSS2A model provides negative damping.
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CN103983853A (en) * 2014-05-09 2014-08-13 国家电网公司 Phase position check method of high voltage cable frogging interconnected system
CN103995204A (en) * 2014-05-29 2014-08-20 国家电网公司 Online monitoring method and device of forced oscillation source of electric power system
CN104049543A (en) * 2014-06-26 2014-09-17 南方电网科学研究院有限责任公司 Real-time simulation platform for researching direct-current isolated island operation machine-network coordination characteristic
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CN106935115A (en) * 2015-12-29 2017-07-07 中国电力科学研究院 A kind of method for building up of generator excited system load module
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CN113013900A (en) * 2021-03-26 2021-06-22 大唐国际发电股份有限公司北京高井热电厂 Excitation regulator PSS2A model parameter configuration method

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CN103983853A (en) * 2014-05-09 2014-08-13 国家电网公司 Phase position check method of high voltage cable frogging interconnected system
CN103995204A (en) * 2014-05-29 2014-08-20 国家电网公司 Online monitoring method and device of forced oscillation source of electric power system
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CN106066440A (en) * 2016-08-18 2016-11-02 四川理工学院 A kind of PSS negative damping detection method
CN106066440B (en) * 2016-08-18 2018-07-03 四川理工学院 A kind of PSS negative dampings detection method
CN111007396A (en) * 2019-12-05 2020-04-14 广东电网有限责任公司 Method and device for detecting accuracy of PSS2A/B model and storage medium
CN111007396B (en) * 2019-12-05 2022-01-11 广东电网有限责任公司 Method and device for detecting accuracy of PSS2A/B model and storage medium
CN113013900A (en) * 2021-03-26 2021-06-22 大唐国际发电股份有限公司北京高井热电厂 Excitation regulator PSS2A model parameter configuration method

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