CN111654066B - Method and system for determining filter factor of water-fire-electricity frequency division control AGC system - Google Patents
Method and system for determining filter factor of water-fire-electricity frequency division control AGC system Download PDFInfo
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Abstract
The invention discloses a method and a system for determining a filter factor of a water-fire-electricity frequency division control AGC system, wherein a power grid is set to be in a non-frequency modulation regulation mode, a frequency modulation filter factor alternative value of a thermal power generating unit is determined according to a steady-state frequency modulation result, and a frequency modulation filter factor alternative value of a hydroelectric power generating unit is determined according to a disturbance frequency modulation result; setting a power grid in a frequency division adjusting mode, setting a filter factor of an AGC system according to a current frequency modulation filter factor alternative value of a thermal power generating unit and a current frequency modulation filter factor alternative value of a hydroelectric generating unit, carrying out simulation test, obtaining a secondary frequency modulation result of the AGC system on the power grid in the frequency division adjusting mode, and determining an optimal value of the filter factor of the hydroelectric power frequency division control AGC system according to the secondary frequency modulation result. According to the method, the filtering factor of the AGC system is accurately and efficiently determined by a simulation means, the dependency of parameter configuration on the past operation experience of the conventional power grid is reduced, the optimal solution can be quickly given, the optimal frequency modulation performance of the frequency modulation unit is fully exerted, and the trial-and-error cost during the trial operation is reduced.
Description
Technical Field
The present invention relates to the field of power grid Control technologies, and in particular, to a method and a system for determining a filter factor of an Automatic Generation Control (AGC) system for hydro-thermal power frequency division Control.
Background
In 2019, in 5 months, Yu Huo is put into operation directly, the southwest power grid and the main grid are interconnected only by direct current and operate asynchronously with the main grid, and the system frequency is decoupled from the main grid. Under the influence of factors such as high water-electricity occupation ratio, rapid reduction of load level and the like, the frequency stability instead of voltage and power angle stability become key factors influencing the safe and stable operation of the southwest power grid. In order to improve the frequency operation level of the system and fully play the frequency modulation capability of the secondary frequency modulation unit participating in the power grid, the southwest power grid adopts water-fire-electricity frequency division control on an AGC control system aiming at different frequency modulation performances of the water-fire-electricity generating unit, and the hydro-generating unit is generated by fast-changing components and the hydro-generating unit is generated by slow-changing components in the regulating quantity.
AGC frequency division control is applied to part of foreign power grids and obtains a good operation effect, but specific control parameters can be obtained only by a worker who needs to perform test feedback on the power grid with clear characteristics for many times, the consumption time is long, the trial-and-error cost is high, and the stable operation of the power grid is not facilitated during the trial operation period; meanwhile, different power grids cannot be set differently, and the frequency modulation performance of the frequency modulation unit is difficult to be brought into full play quickly.
Therefore, a method for efficiently determining the filter factor of the hydro-thermal power frequency division control AGC system is urgently needed to be researched.
Disclosure of Invention
The invention provides a method and a system for determining a filter factor of a hydro-thermal power frequency division control AGC system, which aim to solve the problem of how to determine the filter factor of the AGC system for the hydro-thermal power frequency division control.
In order to solve the above problem, according to an aspect of the present invention, there is provided a method of determining a filter factor of a hydro-thermal power division control AGC system, the method including:
establishing a power grid simulation model for dynamic simulation of the whole process of the regional power grid;
setting an automatic power generation control AGC system in a non-frequency regulation mode, respectively carrying out simulation test on power grids corresponding to different preset thermal power unit frequency modulation filter factors by using the power grid simulation model according to a preset steady random fluctuation fault set, acquiring steady frequency modulation results of the AGC systems corresponding to the different thermal power unit frequency modulation filter factors on the power grids, and determining a thermal power unit frequency modulation filter factor alternative value according to the acquired steady frequency modulation results;
setting the AGC system in a non-frequency modulation regulation mode, respectively carrying out simulation tests on power grids corresponding to different preset hydroelectric generating set frequency modulation filter factors by using the power grid simulation model according to a preset fault disturbance fault set, acquiring disturbance frequency modulation results of the AGC system corresponding to the different hydroelectric generating set frequency modulation filter factors on the power grids, and determining a hydroelectric generating set frequency modulation filter factor alternative value according to the acquired disturbance frequency modulation results;
setting an AGC system in a frequency division regulation mode, setting a filter factor of the AGC system according to a current motor set frequency modulation filter factor alternative value and a hydroelectric generating set frequency modulation filter factor alternative value, carrying out simulation test on a power grid by using a power grid simulation model according to a preset steady random fluctuation fault set and a fault disturbance fault set, and obtaining a secondary frequency modulation result of the AGC system on the power grid in the frequency division regulation mode;
and if the secondary frequency modulation result of the AGC system on the power grid in the current frequency division regulation mode meets the preset frequency modulation control requirement, determining the current alternative value of the frequency modulation filter factor of the generator set and the alternative value of the frequency modulation filter factor of the hydroelectric generating set as the optimal value of the filter factor of the water-fire-electricity frequency division control AGC system.
Preferably, wherein the method further comprises:
presetting different thermal power unit frequency modulation filter factors according to the frequency modulation characteristics of the thermal power unit;
different frequency modulation filter factors of the hydroelectric generating set are preset according to the frequency modulation characteristics of the hydroelectric generating set.
Preferably, the determining the alternative value of the frequency modulation filter factor of the thermal power generating unit according to the obtained steady-state frequency modulation result includes:
and analyzing the steady state frequency modulation results of the power grid by the AGC systems corresponding to different thermal power unit frequency modulation filter factors, and selecting the thermal power unit frequency modulation filter factor corresponding to the steady state frequency modulation result which is small in frequency vibration amplitude of the power grid and not biased to one side in a preset time period as a thermal power unit frequency modulation filter factor alternative value.
Preferably, the determining the optional value of the frequency modulation filter factor of the hydroelectric generating set according to the obtained disturbance frequency modulation result includes:
and analyzing disturbance frequency modulation results of the power grid by AGC systems corresponding to different hydroelectric generating set frequency modulation filter factors, and selecting hydroelectric generating set frequency modulation filter factors corresponding to the disturbance frequency modulation results which are high in adjustment speed and free of oscillation of the power grid from the disturbance frequency modulation results as alternative values of the hydroelectric generating set frequency modulation filter factors.
Preferably, wherein the method further comprises:
if the secondary frequency modulation result of the AGC system to the power grid in the current frequency division regulation mode does not meet the preset frequency modulation control requirement, updating the current motor set frequency modulation filter factor alternative value and the hydroelectric generating set frequency modulation filter factor alternative value according to a preset adjustment strategy, and re-acquiring the secondary frequency modulation result of the AGC system to the power grid in the frequency division regulation mode until the secondary frequency modulation result of the AGC system to the power grid in the frequency division regulation mode meets the preset frequency modulation control requirement, determining the current motor set frequency modulation filter factor alternative value and the hydroelectric generating set frequency modulation filter factor alternative value as the optimal filter factor value of the hydroelectric generating set frequency modulation control AGC system.
According to another aspect of the present invention, there is provided a system for determining a filter factor of a hydro-thermal power division control, AGC, system, the system comprising:
the power grid simulation model establishing unit is used for establishing a power grid simulation model for dynamic simulation of the whole process of the regional power grid;
the device comprises a thermal power generating unit frequency modulation filter factor alternate value determining unit, a power grid simulation model and a power grid selecting unit, wherein the thermal power generating unit frequency modulation filter factor alternate value determining unit is used for setting an automatic power generation control AGC system to be in a non-frequency modulation regulation mode, respectively carrying out simulation tests on power grids corresponding to different preset thermal power generating unit frequency modulation filter factors by using the power grid simulation model according to a preset steady state random fluctuation fault set, acquiring steady state frequency modulation results of the AGC systems corresponding to different thermal power generating unit frequency modulation filter factors on the power grids, and determining a thermal power generating unit frequency modulation filter factor alternate value according to the acquired steady state frequency modulation results;
the hydropower unit frequency modulation filter factor alternative value determining unit is used for setting the AGC system to be in a non-frequency modulation regulation mode, respectively carrying out simulation test on power grids corresponding to different preset hydroelectric unit frequency modulation filter factors by utilizing the power grid simulation model according to a preset fault disturbance fault set, acquiring disturbance frequency modulation results of the AGC systems corresponding to the different hydroelectric unit frequency modulation filter factors on the power grids, and determining the hydropower unit frequency modulation filter factor alternative value according to the acquired disturbance frequency modulation results;
the frequency modulation result acquisition unit is used for setting the AGC system in a frequency division adjustment mode, setting a filter factor of the AGC system according to a current generator set frequency modulation filter factor alternate value and a hydroelectric generating set frequency modulation filter factor alternate value, carrying out simulation test on a power grid by using the power grid simulation model according to a preset steady-state random fluctuation fault set and a preset fault disturbance fault set, and acquiring a secondary frequency modulation result of the AGC system on the power grid in the frequency division adjustment mode;
and the optimal value determining unit is used for determining the current alternative value of the frequency modulation filter factor of the generator set and the alternative value of the frequency modulation filter factor of the hydroelectric generating set as the optimal value of the filter factor of the water-fire-electricity frequency division control AGC system if the secondary frequency modulation result of the AGC system to the power grid in the current frequency division regulation mode meets the preset frequency modulation control requirement.
Preferably, wherein the system further comprises:
the filtering factor presetting unit is used for presetting different thermal power unit frequency modulation filtering factors according to the frequency modulation characteristics of the thermal power unit; the frequency modulation filtering method is used for presetting different frequency modulation filtering factors of the hydroelectric generating set according to the frequency modulation characteristics of the hydroelectric generating set.
Preferably, the determining unit for the alternative value of the frequency modulation filter factor of the thermal power generating unit determines the alternative value of the frequency modulation filter factor of the thermal power generating unit according to the obtained steady-state frequency modulation result, and includes:
and analyzing the steady state frequency modulation results of the power grid by the AGC systems corresponding to different thermal power unit frequency modulation filter factors, and selecting the thermal power unit frequency modulation filter factor corresponding to the steady state frequency modulation result which is small in frequency vibration amplitude of the power grid and not biased to one side in a preset time period as a thermal power unit frequency modulation filter factor alternative value.
Preferably, the determining unit for the alternate value of the frequency modulation filter factor of the hydroelectric generating set determines the alternate value of the frequency modulation filter factor of the hydroelectric generating set according to the obtained disturbance frequency modulation result, and includes:
and analyzing disturbance frequency modulation results of the power grid by AGC systems corresponding to different hydroelectric generating set frequency modulation filter factors, and selecting hydroelectric generating set frequency modulation filter factors corresponding to the disturbance frequency modulation results which are high in adjustment speed and free of oscillation of the power grid from the disturbance frequency modulation results as alternative values of the hydroelectric generating set frequency modulation filter factors.
Preferably, wherein the system further comprises:
and the filtering factor alternative value updating unit is used for updating the current motor group frequency modulation filtering factor alternative value and the hydroelectric generating set frequency modulation filtering factor alternative value according to a preset adjustment strategy if the secondary frequency modulation result of the AGC system to the power grid in the current frequency division adjustment mode does not meet the preset frequency modulation control requirement, and entering the frequency modulation result acquiring unit in the frequency division adjustment mode to acquire the secondary frequency modulation result of the AGC system to the power grid in the frequency division adjustment mode again until the secondary frequency modulation result of the AGC system to the power grid in the frequency division adjustment mode meets the preset frequency modulation control requirement, and determining that the current motor group frequency modulation filtering factor alternative value and the hydroelectric generating set frequency modulation filtering factor alternative value are the optimal filtering factor values of the water-fire-electricity frequency division control AGC system.
The invention provides a method and a system for determining a filter factor of a water, fire and electricity frequency division control AGC system, wherein the AGC system is set to be in a non-frequency modulation regulation mode, a frequency modulation filter factor alternative value of a thermal power generating unit is determined according to a steady-state frequency modulation result, and a frequency modulation filter factor alternative value of a hydroelectric generating unit is determined according to a disturbance frequency modulation result; setting the AGC system in a frequency division adjusting mode, setting a filter factor of the AGC system according to a current frequency modulation filter factor alternative value of the thermal power generating unit and a current frequency modulation filter factor alternative value of the hydroelectric generating unit, carrying out simulation test, obtaining a secondary frequency modulation result of the AGC system on a power grid in the frequency division adjusting mode, and determining the optimal value of the filter factor of the hydroelectric power frequency division control AGC system according to the secondary frequency modulation result. According to the invention, the filtering factor corresponding to the water-fire-electricity generator set in the water-fire-electricity frequency division control AGC system is accurately and efficiently determined by a simulation means, the dependency of parameter configuration on the past operation experience of the conventional power grid is reduced, the optimal solution can be quickly given, the optimal frequency modulation performance of the frequency modulation unit is fully exerted, and the trial-and-error cost during the trial operation is reduced.
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Exemplary embodiments of the invention may be more completely understood in consideration of the following drawings:
fig. 1 is a flow chart of a method 100 of determining a filter factor of a hydro-thermal power division control, AGC, system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic illustration of the effect of steady-state random fluctuation adjustment according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of the effect of fault disturbance adjustment according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating the effect of water-fire-electricity frequency division adjustment according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a system 500 for determining a filter factor of a thermal power division control AGC system according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same unit/element is denoted by the same reference numeral.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a method 100 for determining a filter factor of a thermal power division control AGC system according to an embodiment of the present invention. As shown in fig. 1, the method for determining the filter factor of the hydroelectric power frequency division control AGC system according to the embodiment of the present invention accurately and efficiently determines the filter factor corresponding to the hydroelectric power generation unit in the hydroelectric power frequency division control AGC system through a simulation means, reduces the dependency of parameter configuration on the past operation experience of the conventional power grid, can quickly provide an optimal solution, fully exerts the optimal frequency modulation performance of the frequency modulation unit, and reduces the trial-and-error cost during the trial operation. The method 100 for determining the filter factor of the hydroelectric power frequency division control AGC system provided by the embodiment of the invention starts from step 101, and establishes a power grid simulation model for the whole process dynamic simulation of a regional power grid in step 101.
In step 102, setting the AGC system in a non-frequency modulation regulation mode, respectively performing simulation tests on power grids corresponding to different preset thermal power unit frequency modulation filter factors by using the power grid simulation model according to a preset steady random fluctuation fault set, acquiring steady frequency modulation results of the AGC systems corresponding to different thermal power unit frequency modulation filter factors on the power grids, and determining a thermal power unit frequency modulation filter factor alternative value according to the acquired steady frequency modulation results.
Preferably, the determining the alternative value of the frequency modulation filter factor of the thermal power generating unit according to the obtained steady-state frequency modulation result includes:
and analyzing the steady state frequency modulation results of the power grid by the AGC systems corresponding to different thermal power unit frequency modulation filter factors, and selecting the thermal power unit frequency modulation filter factor corresponding to the steady state frequency modulation result which is small in frequency vibration amplitude of the power grid and not biased to one side in a preset time period as a thermal power unit frequency modulation filter factor alternative value.
In step 103, setting the AGC system in a non-frequency modulation regulation mode, performing simulation tests on the power grids corresponding to the preset different hydroelectric generating set frequency modulation filter factors by using the power grid simulation model according to a preset fault disturbance fault set, acquiring disturbance frequency modulation results of the AGC systems corresponding to the different hydroelectric generating set frequency modulation filter factors on the power grids, and determining a hydroelectric generating set frequency modulation filter factor alternative value according to the acquired disturbance frequency modulation results.
Preferably, the determining the optional value of the frequency modulation filter factor of the hydroelectric generating set according to the obtained disturbance frequency modulation result includes:
and analyzing disturbance frequency modulation results of the power grid by AGC systems corresponding to different hydroelectric generating set frequency modulation filter factors, and selecting hydroelectric generating set frequency modulation filter factors corresponding to the disturbance frequency modulation results which are high in adjustment speed and free of oscillation of the power grid from the disturbance frequency modulation results as alternative values of the hydroelectric generating set frequency modulation filter factors.
Preferably, wherein the method further comprises:
presetting different thermal power unit frequency modulation filter factors according to the frequency modulation characteristics of the thermal power unit;
different frequency modulation filter factors of the hydroelectric generating set are preset according to the frequency modulation characteristics of the hydroelectric generating set.
In the implementation mode of the invention, firstly, a power grid simulation model for dynamic simulation of the whole process of a regional power grid is established, and a power grid typical fault set is set according to actual operation disturbance of the power grid; wherein, the typical fault set of the power grid comprises: a steady-state random fluctuation fault set and a fault disturbance fault set; setting a plurality of different thermal power unit frequency modulation filter factors according to the frequency modulation characteristics of the thermal power unit; and setting a plurality of different hydroelectric generating set frequency modulation filter factors according to the frequency modulation characteristic of the hydroelectric generating set. Then, setting the AGC system to be in a non-frequency-division regulation mode, and respectively carrying out simulation test on the power grids corresponding to the preset different thermal power generating unit frequency modulation filter factors by using the power grid simulation model to obtain the steady-state frequency modulation results of the automatic power generation control AGC system to the power grids corresponding to the different thermal power generating unit frequency modulation filter factors; and analyzing the steady state frequency modulation results of the power grid by the AGC systems corresponding to different thermal power unit frequency modulation filter factors, and selecting the thermal power unit frequency modulation filter factor corresponding to the steady state frequency modulation result which is small in frequency vibration amplitude of the power grid and not biased to one side in a preset time period as a thermal power unit frequency modulation filter factor alternative value. Then, setting the AGC system to be in a non-frequency division regulation mode, and according to a preset fault disturbance fault set, respectively carrying out simulation test on power grids corresponding to different hydroelectric generating set frequency modulation filter factors by using the power grid simulation model to obtain disturbance frequency modulation results of the AGC system corresponding to the different hydroelectric generating set frequency modulation filter factors on the power grids; and analyzing disturbance frequency modulation results of the power grid by AGC systems corresponding to different hydroelectric generating set frequency modulation filter factors, and selecting hydroelectric generating set frequency modulation filter factors corresponding to the disturbance frequency modulation results which are high in adjustment speed and free of oscillation of the power grid from the disturbance frequency modulation results as the hydroelectric generating set frequency modulation filter factor alternative values.
In step 104, setting the AGC system in a frequency division adjustment mode, setting a filter factor of the AGC system according to a current candidate value of a frequency modulation filter factor of the generator set and a candidate value of a frequency modulation filter factor of the hydroelectric generating set, performing a simulation test on the power grid by using the power grid simulation model according to a preset steady random fluctuation fault set and a preset fault disturbance fault set, and obtaining a secondary frequency modulation result of the AGC system on the power grid in the frequency division adjustment mode.
In step 105, if the secondary frequency modulation result of the AGC system on the power grid in the current frequency division adjustment mode meets the preset frequency modulation control requirement, determining that the current alternative value of the frequency modulation filter factor of the generator set and the alternative value of the frequency modulation filter factor of the hydroelectric generating set are the optimal value of the filter factor of the water-fire-electricity frequency division control AGC system.
Preferably, wherein the method further comprises:
if the secondary frequency modulation result of the AGC system to the power grid in the current frequency division regulation mode does not meet the preset frequency modulation control requirement, updating the current motor set frequency modulation filter factor alternative value and the hydroelectric generating set frequency modulation filter factor alternative value according to a preset adjustment strategy, and re-acquiring the secondary frequency modulation result of the AGC system to the power grid in the frequency division regulation mode until the secondary frequency modulation result of the AGC system to the power grid in the frequency division regulation mode meets the preset frequency modulation control requirement, determining the current motor set frequency modulation filter factor alternative value and the hydroelectric generating set frequency modulation filter factor alternative value as the optimal filter factor value of the hydroelectric generating set frequency modulation control AGC system.
In the embodiment of the invention, after the frequency modulation filter factor alternative value of the thermal power generating unit and the frequency modulation filter factor alternative value of the hydroelectric generating unit are determined, frequency division adjustment is carried out to obtain secondary frequency modulation performance. Specifically, the method comprises the following steps: setting the AGC system to be in a frequency division regulation mode, respectively setting filter factors of the hydroelectric generating set and the thermal power generating set according to a current frequency modulation filter factor alternative value of the hydroelectric generating set and a frequency modulation filter factor alternative value of the hydroelectric generating set, carrying out simulation test on the power grid by using the power grid simulation model according to a preset steady random fluctuation fault set and a fault disturbance fault set, and obtaining a secondary frequency modulation result of the AGC system on the power grid in the frequency division regulation mode. And then, performing rationality evaluation on the filtering factor set by the frequency modulation control according to the secondary frequency modulation result. And if the secondary frequency modulation result of the AGC system on the power grid in the current frequency division regulation mode meets the preset frequency modulation control requirement, determining the current alternative value of the frequency modulation filter factor of the thermal power generating unit and the current alternative value of the frequency modulation filter factor of the hydroelectric power generating unit as the optimal value of the filter factor of the water-fire-electricity frequency division control AGC system. Otherwise, the current motor group frequency modulation filter factor alternative value and the hydroelectric generating set frequency modulation filter factor alternative value are updated according to a preset adjustment strategy, the step 104 is returned to obtain the secondary frequency modulation result of the AGC system to the power grid under the frequency division adjustment mode again, and the current motor group frequency modulation filter factor alternative value and the hydroelectric generating set frequency modulation filter factor alternative value are determined to be the optimal filter factor value of the water-fire-electricity frequency division control AGC system when the secondary frequency modulation result of the AGC system to the power grid under the frequency division adjustment mode meets the preset frequency modulation control requirement. The method comprises the steps of obtaining a frequency modulation filtering factor candidate value of a hydroelectric generating set, and obtaining a fault disturbance frequency modulation effect of the hydroelectric generating set.
The following specifically exemplifies embodiments of the present invention
In 2019, in 5 months, Yubei is put into operation directly, the southwest power grid and the main grid run asynchronously, and the frequency problem replaces the power angle problem and the voltage problem to become the main influence factor of the safe and stable operation of the power grid. In order to give full play to the secondary frequency modulation capability of the system, respectively give play to the advantages of quick adjustment of water and electricity and stable adjustment of thermal power, and avoid the defects of over-adjustment of water and electricity and over-slow adjustment of thermal power caused by delay effect, frequency division control is adopted for AGC units in the jurisdiction according to different types.
The southwest power grid asynchronous operation time is short, the power grid characteristics are greatly different from those before asynchronous operation, and the difficulty in setting the filtering factors for controlling the hydraulic power frequency division in an expert experience mode is high, so that the respective filtering factors can be configured in a simulation way. Specifically, the step of determining the filter factors includes:
1) and establishing a power grid simulation model for dynamic simulation of the whole process of the regional power grid by using the online trend derived data of 12 months, 30 days, 14:30 in 2019 as simulation basic data. The configuration of other parameters controlled by the primary station is shown in table 1.
TABLE 1 AGC System operating parameters
2) And setting a fault set comprising a steady-state random fluctuation fault set and a fault disturbance fault set.
The method is characterized in that the steady-state random fluctuation simulates the random load fluctuation of the power grid, the random load fluctuation amount is about +/-160 MW, the fluctuation amount of the type (5) is about +/-0.045 Hz under the condition of no AGC, and the steady-state frequency modulation working condition consists of the following five types:
(1)750 seconds of "monotonically slowly increasing load + minute-scale load random fluctuations";
(2)750 seconds 'monotone rapid load increase + minute-level random load fluctuation'
(3)750 seconds 'monotone rapid load drop + minute-level random load fluctuation'
(4)750 seconds of "monotone slow decreasing load + minute-level load random fluctuation";
(5)750 seconds "minute-scale load random fluctuation".
The fault disturbance mainly aims at the N-1 fault, the characteristics of a southwest power grid are considered, and the fault disturbance mainly refers to unit trip.
3) And (3) assuming that the power grid does not carry out frequency division regulation, at the moment, the thermal power generating unit is regulated slowly, setting the filter factors to be 0.05, 0.1 and 0.2 respectively, utilizing the regulating effect of the steady-state random fluctuation fault set testing system on the steady-state random fluctuation load, and determining the alternative value of the frequency modulation filter factor of the thermal power generating unit.
As shown in fig. 2, when the filtering factor is 0.05, in the stage of rapid load rise (750 seconds to 1500 seconds), the secondary frequency modulation cannot well track the load change of the system, and the system frequency has a long-term low frequency. When the filtering factor is 0.2, the frequency offset of the steady-state frequency modulation of the system becomes significantly large. Therefore, the filter factor 0.1 is used as the optimal filter factor of the steady-state frequency modulation, the alternative value of the thermal power generating unit frequency modulation filter factor is 0.1, and the frequency modulation effect at the moment is used as the steady-state frequency modulation standard F1.
4) And (3) assuming that the frequency division adjustment is not carried out on the power grid, the adjustment of the hydroelectric generating set is slow, the filtering factors are respectively set to be 0.3, 0.5 and 0.7, the adjustment effect of the fault disturbance fault set test system on the fault disturbance load is utilized, and the alternative value of the frequency modulation filtering factor of the thermal generating set is determined.
The effect of fault disturbance adjustment is shown in fig. 3, when the filter factor is 0.3, the frequency recovery speed after disturbance is slow. When the filtering factor is 0.7, the frequency recovery after disturbance is fast, but the system frequency is oscillated in the later period of recovery, which is not favorable for the system stability. Therefore, the filtering factor 0.5 is used as the optimal filtering factor after fault disturbance, the alternative value of the frequency modulation filtering factor of the hydroelectric generating set is 0.2, and the frequency modulation effect at the moment is used as the fault frequency modulation standard F2.
5) Setting a power grid for frequency division adjustment, respectively setting filter factors of the hydroelectric generating set and the thermal generating set by referring to the filter factor alternative values in the steps 3) and 4), carrying out simulation test, and evaluating a simulation result by using F1 and F2. The water-fire-electricity frequency division adjusting effect is shown in fig. 4, and the frequency division adjusting effect is best. Therefore, the optimal filtering factor for the hydroelectric frequency division control is obtained, wherein the thermal power filtering factor is 0.1 and the hydroelectric filtering factor is 0.5 for the southwest power grid.
Fig. 5 is a schematic diagram of a system 500 for determining a filter factor of a thermal power division control AGC system according to an embodiment of the present invention. As shown in fig. 5, a system 500 for determining a filter factor of a thermal power division control AGC system according to an embodiment of the present invention includes: the system comprises a power grid simulation model establishing unit 501, a thermal power generating unit frequency modulation filter factor alternative value determining unit 502, a hydroelectric generating unit frequency modulation filter factor alternative value determining unit 503, a frequency modulation result acquiring unit 504 in a frequency division adjusting mode and a filter factor optimal value determining unit 505.
Preferably, the power grid simulation model establishing unit 501 is configured to establish a power grid simulation model for dynamic simulation of the whole process of the regional power grid.
Preferably, the thermal power generating unit frequency modulation filter factor alternative value determining unit 502 is configured to set the automatic power generation amount control AGC system to be in a non-frequency modulation regulation mode, perform simulation tests on power grids corresponding to different preset thermal power generating unit frequency modulation filter factors respectively by using the power grid simulation model according to a preset steady-state random fluctuation fault set, obtain steady-state frequency modulation results of the AGC systems corresponding to different thermal power generating unit frequency modulation filter factors on the power grids, and determine the thermal power generating unit frequency modulation filter factor alternative value according to the obtained steady-state frequency modulation results.
Preferably, the determining unit 502 for the alternative value of the frequency modulation filter factor of the thermal power generating unit, according to the obtained steady-state frequency modulation result, determines the alternative value of the frequency modulation filter factor of the thermal power generating unit, and includes:
and analyzing the steady state frequency modulation results of the power grid by the AGC systems corresponding to different thermal power unit frequency modulation filter factors, and selecting the thermal power unit frequency modulation filter factor corresponding to the steady state frequency modulation result which is small in frequency vibration amplitude of the power grid and not biased to one side in a preset time period as a thermal power unit frequency modulation filter factor alternative value.
Preferably, the hydroelectric generating set frequency modulation filter factor alternative value determining unit 503 is configured to set the AGC system to be in a non-frequency modulation regulation mode, perform simulation tests on power grids corresponding to different preset hydroelectric generating set frequency modulation filter factors by using the power grid simulation model according to a preset fault disturbance fault set, obtain disturbance frequency modulation results of the AGC systems corresponding to different hydroelectric generating set frequency modulation filter factors on the power grids, and determine the hydroelectric generating set frequency modulation filter factor alternative value according to the obtained disturbance frequency modulation results.
Preferably, the determining unit 503 for the candidate value of the frequency modulation filter factor of the hydroelectric generating set according to the obtained disturbance frequency modulation result determines the candidate value of the frequency modulation filter factor of the hydroelectric generating set, and includes:
and analyzing disturbance frequency modulation results of the power grid by AGC systems corresponding to different hydroelectric generating set frequency modulation filter factors, and selecting hydroelectric generating set frequency modulation filter factors corresponding to the disturbance frequency modulation results which are high in adjustment speed and free of oscillation of the power grid from the disturbance frequency modulation results as alternative values of the hydroelectric generating set frequency modulation filter factors.
Preferably, wherein the system further comprises: the filtering factor presetting unit is used for presetting different thermal power unit frequency modulation filtering factors according to the frequency modulation characteristics of the thermal power unit; the frequency modulation filtering method is used for presetting different frequency modulation filtering factors of the hydroelectric generating set according to the frequency modulation characteristics of the hydroelectric generating set.
Preferably, the frequency modulation result obtaining unit 504 in the frequency division adjusting mode is configured to set the self-AGC system in the frequency division adjusting mode, set a filter factor of the AGC system according to a current generator set frequency modulation filter factor candidate value and a hydroelectric generator set frequency modulation filter factor candidate value, perform a simulation test on the power grid according to a preset steady random fluctuation fault set and a fault disturbance fault set, and obtain a secondary frequency modulation result of the AGC system on the power grid in the frequency division adjusting mode.
Preferably, the optimal value determining unit 505 is configured to determine that the current candidate value of the frequency modulation filter factor of the generator set and the candidate value of the frequency modulation filter factor of the hydroelectric generating set are the optimal value of the filter factor of the water-gas-power frequency division control AGC system if the secondary frequency modulation result of the AGC system on the power grid in the current frequency division adjustment mode meets the preset frequency modulation control requirement.
Preferably, wherein the system further comprises: and the filtering factor alternative value updating unit is used for updating the current motor group frequency modulation filtering factor alternative value and the hydroelectric generating set frequency modulation filtering factor alternative value according to a preset adjustment strategy if the secondary frequency modulation result of the AGC system to the power grid in the current frequency division adjustment mode does not meet the preset frequency modulation control requirement, and entering the frequency modulation result acquiring unit in the frequency division adjustment mode to acquire the secondary frequency modulation result of the AGC system to the power grid in the frequency division adjustment mode again until the secondary frequency modulation result of the AGC system to the power grid in the frequency division adjustment mode meets the preset frequency modulation control requirement, and determining that the current motor group frequency modulation filtering factor alternative value and the hydroelectric generating set frequency modulation filtering factor alternative value are the optimal filtering factor values of the water-fire-electricity frequency division control AGC system.
The system 500 for determining the filter factor of the thermal power division control AGC system according to the embodiment of the present invention corresponds to the method 100 for determining the filter factor of the thermal power division control AGC system according to another embodiment of the present invention, and details thereof are not repeated herein.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method of determining a filter factor for a hydro-thermal power division control, AGC, system, the method comprising:
establishing a power grid simulation model for dynamic simulation of the whole process of the regional power grid;
setting an automatic power generation control AGC system in a non-frequency regulation mode, respectively carrying out simulation test on power grids corresponding to different preset thermal power unit frequency modulation filter factors by using the power grid simulation model according to a preset steady random fluctuation fault set, acquiring steady frequency modulation results of the AGC systems corresponding to the different thermal power unit frequency modulation filter factors on the power grids, and determining a thermal power unit frequency modulation filter factor alternative value according to the acquired steady frequency modulation results;
setting the AGC system in a non-frequency modulation regulation mode, respectively carrying out simulation tests on power grids corresponding to different preset hydroelectric generating set frequency modulation filter factors by using the power grid simulation model according to a preset fault disturbance fault set, acquiring disturbance frequency modulation results of the AGC system corresponding to the different hydroelectric generating set frequency modulation filter factors on the power grids, and determining a hydroelectric generating set frequency modulation filter factor alternative value according to the acquired disturbance frequency modulation results;
setting an AGC system in a frequency division regulation mode, setting a filter factor of the AGC system according to a current motor set frequency modulation filter factor alternative value and a hydroelectric generating set frequency modulation filter factor alternative value, carrying out simulation test on a power grid by using a power grid simulation model according to a preset steady random fluctuation fault set and a fault disturbance fault set, and obtaining a secondary frequency modulation result of the AGC system on the power grid in the frequency division regulation mode;
and if the secondary frequency modulation result of the AGC system on the power grid in the current frequency division regulation mode meets the preset frequency modulation control requirement, determining the current alternative value of the frequency modulation filter factor of the generator set and the alternative value of the frequency modulation filter factor of the hydroelectric generating set as the optimal value of the filter factor of the water-fire-electricity frequency division control AGC system.
2. The method of claim 1, further comprising:
presetting different thermal power unit frequency modulation filter factors according to the frequency modulation characteristics of the thermal power unit;
different frequency modulation filter factors of the hydroelectric generating set are preset according to the frequency modulation characteristics of the hydroelectric generating set.
3. The method according to claim 1, wherein the determining the alternative value of the frequency modulation filter factor of the thermal power generating unit according to the obtained steady-state frequency modulation result comprises:
and analyzing the steady state frequency modulation results of the power grid by the AGC systems corresponding to different thermal power unit frequency modulation filter factors, and selecting the thermal power unit frequency modulation filter factor corresponding to the steady state frequency modulation result which is small in frequency vibration amplitude of the power grid and not biased to one side in a preset time period as a thermal power unit frequency modulation filter factor alternative value.
4. The method according to claim 1, wherein determining the alternate value of the frequency modulation filter factor of the hydroelectric generating set according to the obtained disturbance frequency modulation result comprises:
and analyzing disturbance frequency modulation results of the power grid by AGC systems corresponding to different hydroelectric generating set frequency modulation filter factors, and selecting hydroelectric generating set frequency modulation filter factors corresponding to the disturbance frequency modulation results which are high in adjustment speed and free of oscillation of the power grid from the disturbance frequency modulation results as alternative values of the hydroelectric generating set frequency modulation filter factors.
5. The method of claim 1, further comprising:
if the secondary frequency modulation result of the AGC system on the power grid in the current frequency division adjusting mode does not meet the preset frequency modulation control requirement, updating the current motor set frequency modulation filter factor alternative value and the hydroelectric generating set frequency modulation filter factor alternative value according to a preset adjusting strategy, and re-acquiring the secondary frequency modulation result of the AGC system on the power grid in the frequency division adjusting mode until the secondary frequency modulation result of the AGC system on the power grid in the frequency division adjusting mode meets the preset frequency modulation control requirement, and determining the current motor set frequency modulation filter factor alternative value and the hydroelectric generating set frequency modulation filter factor alternative value as the optimal filter factor value of the water-fire-electricity frequency division control AGC system.
6. A system for determining a filter factor for a hydro-thermal frequency division control, AGC, system, comprising:
the power grid simulation model establishing unit is used for establishing a power grid simulation model for dynamic simulation of the whole process of the regional power grid;
the device comprises a thermal power generating unit frequency modulation filter factor alternate value determining unit, a power grid simulation model and a power grid selecting unit, wherein the thermal power generating unit frequency modulation filter factor alternate value determining unit is used for setting an automatic power generation control AGC system to be in a non-frequency modulation regulation mode, respectively carrying out simulation tests on power grids corresponding to different preset thermal power generating unit frequency modulation filter factors by using the power grid simulation model according to a preset steady state random fluctuation fault set, acquiring steady state frequency modulation results of the AGC systems corresponding to different thermal power generating unit frequency modulation filter factors on the power grids, and determining a thermal power generating unit frequency modulation filter factor alternate value according to the acquired steady state frequency modulation results;
the hydropower unit frequency modulation filter factor alternative value determining unit is used for setting the AGC system to be in a non-frequency modulation regulation mode, respectively carrying out simulation test on power grids corresponding to different preset hydroelectric unit frequency modulation filter factors by utilizing the power grid simulation model according to a preset fault disturbance fault set, acquiring disturbance frequency modulation results of the AGC systems corresponding to the different hydroelectric unit frequency modulation filter factors on the power grids, and determining the hydropower unit frequency modulation filter factor alternative value according to the acquired disturbance frequency modulation results;
the frequency modulation result acquisition unit is used for setting the AGC system in a frequency division regulation mode, setting a filter factor of the AGC system according to a current generator set frequency modulation filter factor alternative value and a hydroelectric generating set frequency modulation filter factor alternative value, carrying out simulation test on the power grid by using the power grid simulation model according to a preset steady random fluctuation fault set and a fault disturbance fault set, and acquiring a secondary frequency modulation result of the AGC system on the power grid in the frequency division regulation mode;
and the filter factor optimal value determining unit is used for determining a current generator set frequency modulation filter factor alternative value and a hydroelectric generating set frequency modulation filter factor alternative value as the filter factor optimal value of the water, fire and electricity frequency division control AGC system if a secondary frequency modulation result of the AGC system on the power grid in the current frequency division adjustment mode meets a preset frequency modulation control requirement.
7. The system of claim 6, further comprising:
the filtering factor presetting unit is used for presetting different thermal power unit frequency modulation filtering factors according to the frequency modulation characteristics of the thermal power unit; the frequency modulation filtering method is used for presetting different frequency modulation filtering factors of the hydroelectric generating set according to the frequency modulation characteristics of the hydroelectric generating set.
8. The system according to claim 6, wherein the thermal power unit frequency modulation filter factor candidate determining unit determines the thermal power unit frequency modulation filter factor candidate according to the obtained steady-state frequency modulation result, and includes:
and analyzing the steady state frequency modulation results of the power grid by the AGC systems corresponding to different thermal power unit frequency modulation filter factors, and selecting the thermal power unit frequency modulation filter factor corresponding to the steady state frequency modulation result which is small in frequency vibration amplitude of the power grid and not biased to one side in a preset time period as a thermal power unit frequency modulation filter factor alternative value.
9. The system according to claim 6, wherein the hydroelectric generating set frequency modulation filter factor candidate value determining unit determines the hydroelectric generating set frequency modulation filter factor candidate value according to the obtained disturbance frequency modulation result, and includes:
and analyzing disturbance frequency modulation results of the power grid by AGC systems corresponding to different hydroelectric generating set frequency modulation filter factors, and selecting hydroelectric generating set frequency modulation filter factors corresponding to the disturbance frequency modulation results which are high in adjustment speed and free of oscillation of the power grid from the disturbance frequency modulation results as alternative values of the hydroelectric generating set frequency modulation filter factors.
10. The system of claim 6, further comprising:
and the filtering factor alternative value updating unit is used for updating the current motor group frequency modulation filtering factor alternative value and the hydroelectric generating set frequency modulation filtering factor alternative value according to a preset adjustment strategy if the secondary frequency modulation result of the AGC system to the power grid in the current frequency division adjustment mode does not meet the preset frequency modulation control requirement, and entering the frequency modulation result acquiring unit in the frequency division adjustment mode to acquire the secondary frequency modulation result of the AGC system to the power grid in the frequency division adjustment mode again until the secondary frequency modulation result of the AGC system to the power grid in the frequency division adjustment mode meets the preset frequency modulation control requirement, and determining that the current motor group frequency modulation filtering factor alternative value and the hydroelectric generating set frequency modulation filtering factor alternative value are the optimal filtering factor values of the water-fire-electricity frequency division control AGC system.
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