CN102928697B - 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 PDFInfo
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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
Technical field
The present invention relates to 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
PSS2A model is also accelerating power type PSS(Power System Stabilizer, power system stabilizer, PSS).Generator amature equation of motion perunit value represents, when velocity variations is little, available horsepower replaces torque, then relational expression is:
In above formula: M is the moment of inertia of machine group rotor; P
mfor the mechanical output of generator; P
efor the electric power of generator; ω is the axle speed of generator.
Have after transposition:
Write as deviation form, d/dt S replaces, and obtains the departure of mechanical output:
Because containing various noise in Δ ω, G (s) elimination noise effect is taken advantage of at above formula two ends:
Accelerating power is:
In formula, Δ P
afor the accelerating power deviation of generator.
Use Δ P
abe used as the input of PSS, then the block diagram of PSS2A just as shown in Figure 1, instead adjusts in theory with the PSS of accelerating power as input signal.
Think that PSS2A model is a kind of theoretic accelerating power type PSS by above theoretical analysis, its advantage is the anti-tune problem solving PSS1A model.But, from the theoretical analysis of PSS2A model, also can find out that the key of PSS2A model is that it solves the departure Δ P of mechanical output
mif, Δ P
msolve mistake, then may play opposite effect, namely PSS2A model provides negative damping.As everyone knows, in power system dynamic stability field, if system damping is just, then this system is stable; If system damping is weak or be negative damping, then this system is unstable, and concussion is dispersed.
At present, what in Fig. 1, generator angular velocity omega signal adopted is that equivalent theory computing method obtain, and is not actual measurement generator speed signal.Therefore, at calculating Δ P
mthere is ω signal and calculate the inaccurate and large defect of noise signal large two in time, this is also the key difficulties perplexing the success or failure of PSS2A model.In order to solve above-mentioned noise problem, to the Δ P calculated in PSS2A model
mcarry out G (s) filtering process, this filter function is equivalent to multistage low-pass filtering link, can carry out larger decay, so Δ P to the signal of the local oscillation pattern 1.2 ~ 1.5Hz inspired in the PSS process of the test of routine
msolve inaccurate problem also to have covered up.So occurred such a case, namely under local oscillation pattern (common frequency scope 1.2Hz ~ 1.5Hz), PSS2A model provides positive damping; But then provide negative damping in the low-frequency range of inter-area oscillation mode (frequency is less than 0.5Hz), the vibration of aggravation system, threatens the safe and stable operation of system.
Actual field regulator hanging net operation, the test method that PSS test guidance specifies can only excite the machine to shake pattern, therefore the damping of PSS2A under the machine concussion pattern can only be detected, the damping of PSS2A model in low-frequency range can not be detected, also just can not investigate and whether there is ω signal and solve inaccurate potential safety hazard, cannot shake pattern between simulation region in systems in which, and electrical network does not run the interval concussion pattern of appearance.Therefore, PSS2A model cannot be detected during site test and whether can provide effective positive damping in low-frequency range.
Summary of the invention
Based on this, be necessary whether can provide effective positive damping for the above-mentioned PSS2A model that cannot detect in low-frequency range, thus bring the problem of potential safety hazard to system, a kind of field regulator PSS2A model low-frequency range damping detection method and system are provided.
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, comprises the following steps:
In the networking detection platform of the field regulator put up in advance, change the moment of inertia of generator, make to continuously change by the local oscillation frequency of unit after disturbance, excite the mode of oscillation of full frequency band;
Drop at field regulator respectively, carry out generator upset test when exiting PSS2A model, and record respectively PSS2A model drop into, exit situation under unit upset test waveform;
Contrast the waveform of generator active power under 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, comprising:
Parameter adapting module, in the networking detection platform of the field regulator put up in advance, changes the moment of inertia of generator, makes to continuously change by the local oscillation frequency of unit after disturbance, excite the mode of oscillation of full frequency band;
Logging modle, carries out generator upset test for dropping at field regulator respectively, when exiting PSS2A model, and record respectively PSS2A model drop into, exit situation under unit upset test waveform;
Judge module, for contrasting the waveform of generator active power under identical local oscillation frequency, judges whether the PSS2A model of described field regulator provides negative damping.
As can be seen from above scheme, field regulator PSS2A model low-frequency range damping detection method of the present invention and system, from the basic theories of PSS2A model, build the networking detection platform of field regulator, full frequency band detection has been carried out to the realistic operation situation of the PSS2A model of field regulator and damping thereof, the low frequency oscillation mode of unit can be excited on the basis of uncompensated characteristic not changing unit, detect the damping of PSS2A model in low-frequency range of field regulator, thus the potential safety hazard of the PSS2A model of investigation field regulator.The potential safety hazard that the solution of the present invention solves 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 good application prospect.
Accompanying drawing explanation
Fig. 1 is 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 present 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 schematic;
Fig. 5 is multimachine Infinite bus system model schematic;
Fig. 6 provides positive damping effect schematic diagram for PSS2A;
Fig. 7 provides negative damping effect schematic 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 present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical scheme of the present invention is further described.
Shown in Figure 2, a kind of field regulator PSS2A model low-frequency range damping detection method, comprises the following steps:
Step S101, in the networking detection platform of the field regulator put up in advance, changes the moment of inertia H of generator, makes to continuously change by the local oscillation frequency of unit after disturbance, excite the mode of oscillation of full frequency band, then enter step S102.
As a good embodiment, 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-time digital simulator) 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, first need to realize the interconnected of RTDS device and field regulator.
Carry out for the ease of work, in the present invention, the closed-loop control of field regulator and RTDS is simplified, the controllable silicon (power cabinet) omitting field regulator triggers link and controllable silicon anode voltage detection, and the closed-loop control block diagram of the field regulator built and RTDS device as shown in Figure 3.Wherein: in dotted line frame is generator model in RTDS device and exciter model, 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 the weak electric signal that RTDS device exports is converted into export consistent forceful electric power signal with the voltage transformer (VT) of actual power plant (PT), current transformer (CT), and therefore field regulator signal Ut, It of receiving and the generator unit stator voltage received in actual motion, stator current two sub-value are consistent.Here field regulator refers to actual adjustment of field excitation apparatus.
In addition, described software platform can comprise: the closed loop control logic etc. of the electric network model built in described RTDS device and model parameter, RTDS device and field regulator.Because the emphasis of the present invention's research is field regulator device performance, therefore as a good embodiment, the electric network model built in 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 built in the present invention and multimachine Infinite bus system model are respectively as shown in Figure 4, Figure 5.Be described with the multimachine Infinite bus system model of Fig. 5: #1oo and #2oo is Infinite bus system, #1 and #2 is incorporated to 500kV system, #3 and #4 unit is incorporated to 220kV system; #1 and #2 unit adopts identical generator parameter, #3 and #4 unit adopts identical generator parameter; Field regulator to be detected can realize closed-loop control with any unit, other units adopt self-defining field regulator model, can realize by switching over the operating mode that unit operation or multimachine run simultaneously, substantially can meet the networking testing demand of field regulator.
As a good embodiment, the model parameter in described software platform can adopt the parameter of actual set, also can adopt classical model parameter.
As a good embodiment, the mode of oscillation of full frequency band in the present invention, comprises the whole frequency range of 0.2 ~ 2Hz.
Step S102, drops at field regulator respectively, carries out generator upset test when exiting PSS2A model, and record respectively PSS2A model drop into, exit situation under unit upset test waveform, then enter step S103.
Step S103, contrasts the waveform of generator active power under identical local oscillation frequency, judges whether the PSS2A model of described field regulator provides negative damping.
See shown in Fig. 6, Fig. 7 being the unit upset test waveform effect schematic diagram that step S102 records, can judge to draw that the PSS2A model of field regulator is to provide positive damping and is also to provide negative damping according to this waveform effect schematic diagram.As a good embodiment, described judging whether provides the process of negative damping specifically can comprise: contrasted by the waveform of generator active power under identical local oscillation frequency, if the generator active power number of oscillation drawn in PSS2A model input situation by contrast be less than PSS2A model exit situation under the generator active power number of oscillation, then judge that PSS2A model provides positive damping; If the generator active power number of oscillation in PSS2A model input situation be greater than PSS2A model exit situation under the generator active power number of oscillation, then judge that PSS2A model provides negative damping.
Be illustrated in figure 6 the effect schematic diagram that PSS2A provides positive damping, wherein, Curve1 is the generator active power curve of cyclical fluctuations under PSS2A exits situation, and Curve2 is the generator active power curve of cyclical fluctuations in PSS2A input situation.In addition, Fig. 7 provides the effect schematic diagram of negative damping for PSS2A, and wherein, Curve1 is the generator active power curve of cyclical fluctuations under PSS2A exits situation, and Curve2 is the generator active power curve of cyclical fluctuations in PSS2A input situation.
If in whole frequency range (0.2 ~ 2.0Hz), PSS2A all provides positive damping, then illustrate that the PSS2A of this field regulator does not exist potential safety hazard; Otherwise under being more than or equal to 1 oscillation frequency if having in whole frequency range, PSS2A provides negative damping, then illustrate that the PSS2A of this field regulator exists potential safety hazard.
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 shown in Figure 8, this system comprises:
Parameter adapting module 101, in the networking detection platform of the field regulator put up in advance, changes the moment of inertia of generator, makes to continuously change by the local oscillation frequency of unit after disturbance, excite the mode of oscillation of full frequency band;
Logging modle 102, carries out generator upset test for dropping at field regulator respectively, when exiting PSS2A model, and record respectively PSS2A model drop into, exit situation under unit upset test waveform;
Judge module 103, for contrasting the waveform of generator active power under identical local oscillation frequency, judges whether the PSS2A model of described field regulator provides negative damping.
As a good embodiment, state judge module 103 and can comprise positive damping detection module and negative damping detection module;
If the generator active power number of oscillation that described positive damping detection module is used for being drawn in PSS2A model input situation by contrast be less than PSS2A model exit situation under the generator active power number of oscillation, then judge that PSS2A model provides positive damping;
If the generator active power number of oscillation that described negative damping detection module is used for being drawn in PSS2A model input situation by contrast be greater than PSS2A model exit situation under the generator active power number of oscillation, then judge that PSS2A model provides negative damping.By judging that PSS2A model is to provide positive damping and is also to provide negative damping, the safe and stable operation of system can be ensured.
Other technical characteristic 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 be found out by above scheme, field regulator PSS2A model low-frequency range damping detection method of the present invention and system, from the basic theories of PSS2A model, build the networking detection platform of field regulator, full frequency band detection has been carried out to the realistic operation situation of the PSS2A model of field regulator and damping thereof, the low frequency oscillation mode of unit can be excited on the basis of uncompensated characteristic not changing unit, detect the damping of PSS2A model in low-frequency range of field regulator, thus the potential safety hazard of the PSS2A model of investigation field regulator.The potential safety hazard that the solution of the present invention solves 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 good application prospect.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It 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, comprise the following steps:
In the networking detection platform of the field regulator put up in advance, change the moment of inertia of generator, make to continuously change by the local oscillation frequency of unit after disturbance, excite the mode of oscillation of full frequency band;
Drop at field regulator respectively, carry out generator upset test when exiting PSS2A model, and record respectively PSS2A model drop into, exit situation under unit upset test waveform;
Contrast the waveform of generator active power under identical local oscillation frequency, judge whether the PSS2A model of described field regulator provides negative damping;
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 RTDS device comprises generator model and exciter model, described power amplifier is converted into the weak electric signal that RTDS device exports and exports consistent forceful electric power signal with the voltage transformer (VT) of actual power plant, current transformer, and the generator unit stator voltage received in the signal that described field regulator receives and actual motion, stator current two sub-value are consistent.
2. field regulator PSS2A model low-frequency range damping detection method according to claim 1, it is characterized in that, described software platform comprises: the closed loop control logic of the electric network model built 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, it 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, described in judge whether that the process providing negative damping comprises:
If the generator active power number of oscillation drawn in PSS2A model input situation by contrast be less than PSS2A model exit situation under the generator active power number of oscillation, then judge that PSS2A model provides positive damping;
If the generator active power number of oscillation drawn in PSS2A model input situation by contrast be greater than PSS2A model exit situation under the generator active power number of oscillation, then judge that PSS2A model provides negative damping.
6. the field regulator PSS2A model low-frequency range damping detection method according to claim 1-5 any one, it is characterized in that, described full frequency band is the frequency range of 0.2 ~ 2Hz.
7. a field regulator PSS2A model low-frequency range damping detection system, is characterized in that, comprising:
Parameter adapting module, in the networking detection platform of the field regulator put up in advance, changes the moment of inertia of generator, makes to continuously change by the local oscillation frequency of unit after disturbance, excite the mode of oscillation of full frequency band;
Logging modle, carries out generator upset test for dropping at field regulator respectively, when exiting PSS2A model, and record respectively PSS2A model drop into, exit situation under unit upset test waveform;
Judge module, for contrasting the waveform of generator active power under identical local oscillation frequency, judges whether the PSS2A model of described field regulator provides negative damping;
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 RTDS device comprises generator model and exciter model, described power amplifier is converted into the weak electric signal that RTDS device exports and exports consistent forceful electric power signal with the voltage transformer (VT) of actual power plant, current transformer, and the generator unit stator voltage received in the signal that described field regulator receives and actual motion, stator current two sub-value are consistent.
8. field regulator PSS2A model low-frequency range damping detection system according to claim 7, it is characterized in that, described judge module comprises positive damping detection module, negative damping detection module;
If the generator active power number of oscillation that described positive damping detection module is used for being drawn in PSS2A model input situation by contrast be less than PSS2A model exit situation under the generator active power number of oscillation, then judge that PSS2A model provides positive damping;
If the generator active power number of oscillation that described negative damping detection module is used for being drawn in PSS2A model input situation by contrast be greater than PSS2A model exit situation under the generator active power number of oscillation, then judge that PSS2A model provides negative damping.
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| CN104101805B (en) * | 2014-07-15 | 2016-09-21 | 四川大学 | A kind of excitation system negative damping detection method injected based on oscillation energy |
| CN104993501B (en) * | 2015-07-03 | 2017-05-17 | 贵州电力试验研究院 | On-line evaluation method of low-frequency oscillation suppression performance of excitation regulator |
| 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 |
| CN106066440B (en) * | 2016-08-18 | 2018-07-03 | 四川理工学院 | A kind of PSS negative dampings detection method |
| 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 |
| CN113013900B (en) * | 2021-03-26 | 2022-09-20 | 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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