CN113890079A - Coordination adjustment method for speed regulation dead zone and direct current FC dead zone of hydroelectric machine - Google Patents
Coordination adjustment method for speed regulation dead zone and direct current FC dead zone of hydroelectric machine Download PDFInfo
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- CN113890079A CN113890079A CN202110990746.1A CN202110990746A CN113890079A CN 113890079 A CN113890079 A CN 113890079A CN 202110990746 A CN202110990746 A CN 202110990746A CN 113890079 A CN113890079 A CN 113890079A
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- 230000033228 biological regulation Effects 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000010355 oscillation Effects 0.000 claims abstract description 35
- 238000013016 damping Methods 0.000 claims abstract description 27
- 230000002401 inhibitory effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Control Of Eletrric Generators (AREA)
- Control Of Water Turbines (AREA)
Abstract
The invention belongs to the technical field of electric power systems and automation thereof, and particularly relates to a coordination adjusting method for a speed regulation dead zone and a direct current (FC) dead zone of a hydroelectric machine. The coordination setting process is mainly divided into two steps, firstly, ultralow frequency oscillation with the oscillation amplitude of 0.08Hz or above is inhibited through direct current FC parameter setting and increasing dead zones of the unit with larger negative damping contribution; and secondly, ultralow frequency oscillation with oscillation amplitude below 0.08Hz is inhibited by adjusting PID parameters of speed regulators of other hydroelectric generating sets. The ultra-low frequency oscillation can be effectively inhibited, and the system frequency regulation capability is improved.
Description
Technical Field
The invention belongs to the technical field of electric power systems and automation thereof, and particularly relates to a coordination adjusting method for a speed regulation dead zone and a direct current (FC) dead zone of a hydroelectric machine.
Background
At present, accidents causing ultralow frequency oscillation can be mainly divided into two types, namely faults such as instantaneous grounding, direct current commutation failure and the like which do not relate to power unbalance, and faults such as permanent power shortage or surplus. The first type of fault causes an oscillation with an ultra low frequency oscillation frequency of around 50HZ, while the second type of fault, while oscillating, will deviate from 50HZ and not oscillate around 50 HZ.
Aiming at the first type of faults, the control aims to inhibit ultralow frequency oscillation, the problem of frequency recovery does not exist, and if the system inertia is large enough, the type of faults can not cause the frequency change of the system to exceed the dead zone of the hydroelectric generating set. However, after asynchronous networking of power grids, simulation analysis is carried out on different power grid modes (such as different power grid modes N-1 and N-2 of a southwest power grid) under the condition of large grid parameters of a hydroelectric speed regulator, and the simulation analysis shows that about 71% of N-1 faults and 61% of N-2 faults can excite an ultralow frequency oscillation phenomenon, the frequency difference is about 0.3HZ-0.4HZ, the oscillation period is generally between 15 seconds and 25 seconds, ideal control only needs direct current to participate in frequency modulation, and hydroelectric generating sets need to be avoided.
For the second type of faults, the control target needs to consider the suppression of ultralow frequency oscillation and frequency recovery at the same time, and the isolated network mode switching frequency adopted by the hydroelectric generating set at present is 0.3HZ to 0.5 HZ. When the power unbalance amount is large, the hydroelectric speed regulator is switched to an island mode, ultra-low frequency oscillation cannot be generated, and the primary frequency modulation capability of the hydroelectric generating set is sacrificed; when the frequency deviation caused by power unbalance is not enough to switch the control mode of the speed regulator of the hydroelectric generating set, an ultralow frequency oscillation phenomenon is generated.
Disclosure of Invention
The invention provides a coordination adjusting method for a speed regulation dead zone and a direct current FC dead zone of a hydroelectric machine, aiming at solving the technical problem of how to effectively inhibit the ultra-low frequency oscillation phenomenon.
The technical scheme is adopted to solve the technical problems;
a coordination adjusting method for a hydropower speed regulation dead zone and a direct current FC dead zone comprises the following steps:
step 1: determining direct current related parameters according to the maximum direct current adjusting capacity;
step 2: gradually increasing the dead zone frequency of the unit with larger negative damping contribution in all the units according to the negative damping contribution degree of the units; the larger value is that the negative damping in all the units is sequenced, the middle number is determined, and if the negative damping is larger than the middle number, the unit with the larger negative damping is determined; by gradually increasing the dead zone frequency of the unit with larger negative damping contribution in all units, the oscillation with the amplitude above 0.08HZ is effectively inhibited.
And step 3: checking whether the oscillation frequency is stable, if so, executing the step 4, and if not, executing the step 1;
and 4, step 4: and adjusting PID parameters of the conventional hydroelectric generating set speed regulator. By adjusting PID parameters of a conventional hydroelectric generating set speed regulator, oscillation with the amplitude below 0.08HZ is restrained.
Preferably, the upper limit and the lower limit of the frequency modulation of the direct current in the step 1 are-10% to + 5% of rated power, the dead zone is +/-0.08 Hz, and the K coefficient is 800 MW/Hz.
Preferably, the dead zone frequency in step 2 is 0.08 Hz.
Preferably, the dead zone frequency of the weakly damped large water is modulated to at least 0.08Hz in step 4.
Compared with the prior art, the invention has the beneficial effects that: the invention gradually increases the dead zone frequency of the unit with larger damping contribution in all units, thereby effectively inhibiting the oscillation with the amplitude of more than 0.08HZ, and inhibiting the oscillation with the amplitude of less than 0.08HZ by adjusting the PID parameter of the conventional hydroelectric generating set speed regulator, thereby effectively inhibiting the ultra-low frequency oscillation and improving the capacity of regulating the system frequency.
Drawings
FIG. 1 is a flow chart of a primary frequency modulation and direct current frequency modulation coordination control strategy of a hydroelectric generating set according to the present invention;
FIG. 2 is a system frequency curve of the rewaving direct current FC dead zone frequency of 0.08Hz and the flood plate N-2 fault;
FIG. 3 is a system frequency curve of a flood plate N-2 fault after the dead zone frequency of the rewaving direct current FC is 0.08Hz and the dead zone of part of the unit is increased;
FIG. 4 is a system frequency curve of a flood plate N-2 fault in which the rewaving direct current FC dead zone frequency is 0.08Hz, the dead zone of a part of the unit is increased, and the PID parameters of the hydroelectric generating set are adjusted;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached figure 1, the coordinated adjustment method of the hydropower speed regulation dead zone and the direct current FC dead zone comprises the following steps:
step 1: determining direct current related parameters according to the maximum direct current adjusting capacity;
step 2: gradually increasing the dead zone frequency of the unit with larger negative damping contribution in all the units according to the negative damping contribution degree of the units; the larger value is that the negative damping in all the units is sequenced, the middle number is determined, and if the negative damping is larger than the middle number, the unit with the larger negative damping is determined; by gradually increasing the dead zone frequency of the unit with larger negative damping contribution in all units, the oscillation with the amplitude above 0.08HZ is effectively inhibited.
And step 3: checking whether the oscillation frequency is stable, if so, executing the step 4, and if not, executing the step 1;
and 4, step 4: and adjusting PID parameters of the conventional hydroelectric generating set speed regulator. By adjusting PID parameters of a conventional hydroelectric generating set speed regulator, oscillation with the amplitude below 0.08HZ is restrained.
Preferably, the upper limit and the lower limit of the frequency modulation of the direct current in the step 1 are-10% to + 5% of rated power, the dead zone is +/-0.08 Hz, and the K coefficient is 800 MW/Hz.
Preferably, the dead zone frequency in step 2 is 0.08 Hz.
Preferably, the dead zone frequency of the weakly damped large water is modulated to at least 0.08Hz in step 4.
Taking a typical small-scale grid mode in southwest as an example, considering the maintenance and fault conditions of direct current in actual operation, parameter setting is performed by taking the example that only direct current is rewarded to participate in modulation, and the invention is further explained.
Referring to fig. 2, step 1: determining direct current related parameters;
setting the upper and lower limit of the frequency modulation of the re-vone direct current to be-10% -to + 5% of rated power, setting the dead zone to be +/-0.08 Hz, and setting the K coefficient to be 800 MW/Hz. At this time, ultralow frequency oscillation with amplitude larger than 0.08Hz still exists under serious faults. Taking the flood plate N-2 fault as an example, the system frequency curve is shown with reference to fig. 2.
As shown in fig. 3, step 2: gradually increasing the dead zone frequency of the unit with larger negative damping contribution degree according to the negative damping contribution degree;
when the xi tai chi and the dead zone of all units towards the home dam are increased to 0.8HZ, the amplitude of low-frequency oscillation just cannot be larger than 0.08HZ after the ground fault occurs.
And step 3: checking whether the oscillation frequency is stable, if so, executing the step 4, and if not, executing the step 1;
the larger negative damping means that the negative damping in all the units is sequenced, the middle number is determined, and if the negative damping is larger than the middle number, the unit with the larger negative damping is determined; and when the oscillation frequency is still larger than 0.08HZ after the setting, increasing the dead zone frequency in the step 2, or performing check after the intermediate number is determined again until the oscillation frequency is smaller than 0.08HZ, and then performing the step 4.
And 4, step 4: when the dead zone of the hydroelectric generating set is increased, the oscillation with the oscillation amplitude lower than 0.08HZ still occurs under serious faults, and the PID parameters of the residual hydroelectric generating set need to be adjusted until the damping requirement is met.
The hydroelectricity unit parameter adjustment is shown in the following table:
after the parameters are set, the frequency curve under the large disturbance fault is shown in fig. 4, and the system damping is 9.44%.
With reference to fig. 4, it can be known that a set of parameters of the hydroelectric speed regulating system and the direct-current frequency controller which are coordinated can be obtained according to the setting process in the steps, so that low-frequency oscillation can be effectively inhibited, and the system frequency regulating capability can be improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A coordination adjusting method for a hydropower machine number regulation dead zone and a direct current FC dead zone is characterized by comprising the following steps:
step 1: determining direct current related parameters according to the maximum direct current adjusting capacity;
step 2: gradually increasing the dead zone frequency of the unit with larger negative damping contribution according to the negative damping contribution degrees in the plurality of units; the larger is that the negative damping in all the units is sequenced, the middle number is determined, and if the negative damping is larger than the middle number, the unit with the larger negative damping is determined;
and step 3: checking whether the oscillation frequency is stable, if so, executing the step 4, and if not, executing the step 1;
and 4, step 4: and adjusting PID parameters of the conventional hydroelectric generating set speed regulator.
2. The method for coordinately adjusting the speed regulation dead zone and the direct current FC dead zone of the hydraulic motor according to claim 1, wherein the upper limit and the lower limit of the direct current frequency modulation in the step 1 are-10% to + 5% of rated power, the dead zone is +/-0.08 Hz, and the K coefficient is 800 MW/Hz.
3. The method for coordinately adjusting the speed regulation dead zone and the direct current FC dead zone of the hydraulic motor according to claim 1, wherein the frequency of the dead zone in the step 2 is 0.08 Hz.
4. The method for the coordinated regulation of the speed regulation dead zone and the direct current FC dead zone of the hydroelectric generator as claimed in claim 3, wherein the dead zone frequency of the weakly damped large hydroelectric power is modulated to at least 0.08Hz in step 4.
5. The method for coordinately adjusting the speed regulation dead zone and the direct current FC dead zone of the hydraulic motor as claimed in claim 1, wherein in step 3, if the oscillation frequency is still greater than 0.08HZ, the dead zone frequency in step 2 is increased, or the intermediate number is determined again and then checked until step 4 is executed when the oscillation frequency is less than 0.08 HZ.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116632864A (en) * | 2023-05-31 | 2023-08-22 | 东北电力大学 | Ultra-low frequency oscillation control method based on parameter switching of speed regulator under environmental excitation |
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- 2021-08-26 CN CN202110990746.1A patent/CN113890079A/en active Pending
Patent Citations (6)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116632864A (en) * | 2023-05-31 | 2023-08-22 | 东北电力大学 | Ultra-low frequency oscillation control method based on parameter switching of speed regulator under environmental excitation |
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