CN112350329A - Frequency voltage control device and modeling method thereof - Google Patents
Frequency voltage control device and modeling method thereof Download PDFInfo
- Publication number
- CN112350329A CN112350329A CN202011239842.4A CN202011239842A CN112350329A CN 112350329 A CN112350329 A CN 112350329A CN 202011239842 A CN202011239842 A CN 202011239842A CN 112350329 A CN112350329 A CN 112350329A
- Authority
- CN
- China
- Prior art keywords
- frequency
- voltage
- low
- module
- action
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000009471 action Effects 0.000 claims abstract description 141
- 238000004364 calculation method Methods 0.000 claims abstract description 44
- 238000005520 cutting process Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 6
- 238000004088 simulation Methods 0.000 abstract description 10
- 230000033001 locomotion Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 9
- 230000001133 acceleration Effects 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
-
- 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
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The application discloses frequency voltage control device and modeling method thereof, the device comprises: the RTDS phase-locked loop module is used for calculating the phase and the frequency of the bus voltage and inputting the phase and the frequency of the bus voltage to the frequency-voltage control calculation module; the RTDS voltage effective value calculation module is used for calculating a bus voltage value and inputting the bus voltage value to the frequency voltage control calculation module; and the frequency and voltage control calculation module is used for executing high-frequency generator tripping action and low-frequency low-voltage load shedding action according to the voltage phase, the frequency and the voltage value of the bus. According to the method and the device, the influence of the frequency slip and the voltage slip is considered, the frequency slip and the voltage slip are introduced into a frequency-voltage control simulation model, and the modeling accuracy is improved.
Description
Technical Field
The application relates to the technical field of electric power safety control, in particular to a frequency and voltage control device and a modeling method thereof.
Background
In case of a large power failure, the system power is out of balance, and the frequency or the voltage or both of the frequency and the voltage are reduced at the same time, and at this time, a frequency voltage control device is needed to maintain the safety and stability of the system. The frequency and voltage control device detects the voltage and frequency of the bus at the installation position of the device and the change rate of the voltage and the frequency, and when the frequency and the voltage of the power system are reduced due to active and reactive power shortage, the device automatically cuts off part of the load according to the frequency reduction, so that the power supply and the load of the system are rebalanced. When the power shortage of the power system is large, the frequency and voltage control device has the function of accelerating load switching according to df/dt, and can accelerate switching of a second round or two or three rounds when switching of a first round, so that the frequency can be prevented from dropping as soon as possible; when the load shedding amount of the frequency and voltage control device is insufficient, so that the frequency and voltage of the system are lower than the normal operation level for a long time, 1-2 special wheels are arranged to supplement and cut part of load through long time delay, so that the frequency and voltage of the system are raised to the normal level again. The frequency-voltage control device is installed in a large number of substations with voltage class below 220kV in the power system as a third defense line of the power system, and the load shedding objects are a 110kV direct supply line, a 35kV/10kV distribution line, a main transformer low-voltage side and the like.
At present, when a research on the safety and stability characteristics of a power grid under the impact of a single serious fault or multiple faults on the power grid is carried out, an RTDS (Real Time Digital Simulator) is mostly adopted to construct a Real primary system model and a Real secondary system model of the power grid, the stable evolution process and the recovery characteristics of the power grid are simulated in Real Time, the action behaviors of a control protection device including a frequency voltage control device in the system are considered, the load shedding and load shedding effect of the frequency voltage control device is accurately simulated, and a technical support is provided for power grid fault recovery control. The existing simulation technology does not have an accurate simulation model of the frequency-voltage control device, only can roughly estimate the action effect of the frequency-voltage control device according to the frequency and the voltage of a system, and does not consider the influence of the frequency slip df/dt and the voltage slip du/dt, so that the simulation is inaccurate, and the obtained research conclusion is unreliable.
Disclosure of Invention
The embodiment of the application provides an accurate modeling method for a frequency voltage control device, so that the influence of frequency slip and voltage slip is considered, and the accuracy of modeling is improved.
In view of the above, a first aspect of the present application provides a frequency-voltage control apparatus, including:
the RTDS phase-locked loop module, the RTDS voltage effective value calculating module and the frequency voltage control calculating module;
the RTDS phase-locked loop module is used for calculating the voltage phase and the frequency of a bus and inputting the voltage phase and the frequency of the bus to the frequency-voltage control calculation module;
the RTDS voltage effective value calculation module is used for calculating a bus voltage value and inputting the bus voltage value to the frequency voltage control calculation module;
the frequency and voltage control calculation module is used for executing high-frequency generator tripping action and low-frequency low-voltage load shedding action according to the voltage phase, the frequency and the voltage value of the bus.
Optionally, the frequency-voltage control calculation module further includes a frequency slip module, a low-frequency basic wheel action module, and a low-frequency special wheel action module; the control action and the control effect of each module are consistent with those of an actual device;
the frequency slip module is used for calculating frequency slip according to the bus voltage frequency;
the low-frequency accelerating wheel action module is used for executing low-frequency load shedding action according to the frequency slip value;
the low-frequency basic wheel action module is used for executing low-frequency load shedding action according to the bus voltage frequency and the frequency slip value;
the low-frequency special wheel action module is used for executing low-frequency load shedding action according to the bus voltage frequency.
Optionally, the frequency-voltage control calculation module further includes a voltage slip calculation module, a low-voltage basic wheel action module, and a low-voltage special wheel action module; the control action and the control effect of each modeling module are consistent with those of an actual device;
the voltage slip calculation module is used for calculating voltage slip according to the bus voltage value;
the low-voltage basic wheel action module is used for executing low-voltage load shedding action according to the bus voltage value;
the low-voltage special wheel action module is used for executing low-voltage load shedding action according to the bus voltage value.
Optionally, the system further comprises an external control switch connected with the frequency-voltage control calculation module, and the external control switch is used for controlling the high-frequency generator tripping action and the low-frequency low-voltage load shedding action.
A second aspect of the present application provides a frequency-voltage controlled modeling method, the method comprising:
calculating the frequency and voltage value of the bus voltage;
respectively calculating and calculating frequency slip and voltage slip according to the frequency and voltage value of the bus voltage;
executing high-frequency cutting action and low-frequency load shedding action according to the frequency of the bus voltage;
and executing low-voltage load shedding action according to the voltage value of the bus.
Optionally, the method further comprises executing a low-frequency accelerating wheel action and a low-frequency load shedding action of the low-frequency basic wheel according to the frequency of the bus voltage and the magnitude of the frequency slip.
Optionally, the method further comprises executing a low-voltage accelerating wheel action and a low-frequency load shedding action of the low-voltage basic wheel according to the bus voltage value and the voltage slip.
A third aspect of the present application provides a frequency-voltage control apparatus, the apparatus comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the steps of the frequency-voltage control method according to the first aspect as described above, according to instructions in the program code.
A fourth aspect of the present application provides a computer-readable storage medium for storing program code for performing the method of the first aspect.
According to the technical scheme, the method has the following advantages:
in an embodiment of the present application, a frequency-voltage control apparatus is provided, including: the RTDS phase-locked loop module is used for calculating the phase and the frequency of the bus voltage and inputting the phase and the frequency of the bus voltage to the frequency-voltage control calculation module; the RTDS voltage effective value calculation module is used for calculating a bus voltage value and inputting the bus voltage value to the frequency voltage control calculation module; and the frequency and voltage control calculation module is used for executing high-frequency generator tripping action and low-frequency low-voltage load shedding action according to the voltage phase, the frequency and the voltage value of the bus.
The method and the device can completely simulate the action logic and the action turn setting of the actual frequency voltage control device, and can realize the action characteristic consistent with that of the actual device; the frequency slip and the voltage slip can be accurately calculated, and slip locking logic and low-frequency and low-voltage accelerator wheel logic are realized. The application device occupies small RTDS system resources, can be applied to a power grid real-time simulation model in batches, and realizes accurate simulation of the frequency and voltage recovery characteristics of the power grid.
Drawings
Fig. 1 is a device structure diagram of an embodiment of a frequency-voltage control device according to the present application;
FIG. 2 is a diagram of the interface connections of the RTDS PLL module, the RTDS voltage effective value calculation module and the frequency-voltage control calculation module in the embodiment of the present application;
FIG. 3 is a method flow diagram of one embodiment of a modeling method for frequency-voltage control according to the present application;
FIG. 4 is a logic diagram of high frequency operation in an embodiment of the present application;
FIG. 5 is a logic diagram of low frequency operation in an embodiment of the present application;
FIG. 6 is a logic diagram of low voltage operation in an embodiment of the present application;
FIG. 7 is a waveform of a recording wave of high frequency each round of operation in the embodiment of the present application;
FIG. 8 is a waveform of a recording wave of low frequency each round of motion in the embodiment of the present application;
FIG. 9 is a waveform of a low frequency acceleration wheel action in an embodiment of the present application;
FIG. 10 is a recording waveform of the low frequency slip lock in the embodiment of the present application;
FIG. 11 is a waveform of the recording wave of the low voltage operation of each wheel in the embodiment of the present application;
FIG. 12 is a waveform of a low-pressure acceleration wheel in an embodiment of the present application;
FIG. 13 is a waveform of a low-voltage slip lock operation in an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method of an embodiment of a frequency-voltage control apparatus according to the present invention, as shown in fig. 1, where fig. 1 includes:
an RTDS phase-locked loop module 101, an RTDS voltage effective value calculation module 102 and a frequency voltage control calculation module 103;
the RTDS phase-locked loop module 101 is used for calculating the phase and frequency of the bus voltage and inputting the phase and frequency of the bus voltage to the frequency-voltage control calculation module;
the RTDS voltage effective value calculating module 102 is used for calculating a bus voltage value and inputting the bus voltage value to the frequency voltage control calculating module;
the frequency-voltage control calculation module 103 is used for executing a high-frequency generator tripping action and a low-frequency low-voltage load shedding action according to the voltage phase, the frequency and the voltage value of the bus.
It should be noted that, in the present application, the RTDS phase-locked loop module 101 and the RTDS voltage effective value calculation module 102 of the RTDS themselves are adopted, so as to reduce the resource occupation. The RTDS phase-locked loop module 101 is used for calculating the phase and frequency of the bus voltage, the RTDS voltage effective value calculating module 102 is used for calculating the bus voltage value, and the frequency voltage control calculating module is used for executing high-frequency tripping action and low-frequency low-voltage load shedding action according to the voltage phase, frequency and voltage value of the bus.
As shown in fig. 2, in the interface connection diagram of the RTDS phase-locked loop module, the RTDS voltage effective value calculation module, and the frequency-voltage control calculation module in the embodiment of the present application, in the diagram, U1JAQ, U2JAQ, and U3JAQ are A, B, C three-phase voltage inputs of a bus of a certain substation, PHI _ SB is a voltage phase output calculated by the RTDS phase-locked loop module, Freq _3 is a bus frequency calculated by the RTDS phase-locked loop module, and Urms is a per-unit value of a voltage effective value calculated by the RTDS voltage effective value calculation module. The UFV module in the figure is the frequency voltage control calculation module 103, which completes the high frequency cutting operation and the low frequency low voltage load shedding operation.
The method and the device can completely simulate the action logic and the action turn setting of the actual frequency voltage control device, and can realize the action characteristic consistent with that of the actual device; the frequency slip and the voltage slip can be accurately calculated, and slip locking logic and low-frequency and low-voltage accelerator wheel logic are realized. The application device occupies small RTDS system resources, can be applied to a power grid real-time simulation model in batches, and realizes accurate simulation of the frequency and voltage recovery characteristics of the power grid.
In a specific real-time manner, the frequency-voltage control calculation module 103 includes a high-frequency action module 1031; the high-frequency action module is used for executing high-frequency cutting machine action according to the bus voltage frequency.
It should be noted that when the bus frequency acquired by the high-frequency action module does not belong to the first threshold interval, it indicates that the frequency is abnormal, and all high-frequency logics are locked; and when the bus frequency acquired by the high-frequency action module is in a first threshold interval, executing high-frequency 1-8 turns of actions according to the value of the bus frequency. Specifically, a logic diagram of the high frequency operation for executing the high frequency cutting operation is shown in fig. 4. When the high frequency starting constant value is 0, the default is the first round constant value-0.2 Hz. When the frequency is more than 58Hz or less than 42Hz, the frequency is abnormal, all high-frequency action logics are locked, and the action logics of other high-frequency wheels are consistent with the actual device.
The frequency-voltage control calculation module 103 further includes a frequency slip module 1032, a low frequency accelerator wheel action module 1033, a low frequency basic wheel action module 1034, and a low frequency special wheel action module 1035;
the frequency slip module 1032 is configured to calculate a frequency slip from the bus voltage frequency;
the low-frequency accelerator wheel action module 1033 is used for executing a low-frequency load shedding action according to the frequency slip value;
the low-frequency fundamental wheel action module 1034 is configured to perform a low-frequency load shedding action according to the bus voltage frequency and the frequency slip value;
the low frequency special wheel action module 1035 is used for executing low frequency load shedding action according to the bus voltage frequency.
It should be noted that when the acquired bus frequency does not belong to the preset second threshold interval, it indicates that the frequency is abnormal, and all low-frequency logics are locked; when the obtained frequency slip is larger than a preset third threshold value, locking the low-frequency action to start each wheel action; when the frequency slip obtained by the low-frequency accelerating wheel action module is in a preset first frequency slip interval, executing low-frequency accelerating 2-wheel action, and accelerating 2-wheel action; when the frequency slip obtained by the low-frequency accelerating wheel action module is in a preset second frequency slip interval, the low- frequency accelerating wheels 2 and 3 act, and the accelerating action low-frequency wheels 2 and the accelerating action low-frequency wheels 3 act. And the low-frequency basic wheel action module respectively executes low-frequency 1-6 wheels of actions according to the change of the bus frequency. The low-frequency special wheel action module respectively executes the actions of the low-frequency special wheel 1 and the low-frequency special wheel 2 according to the change of the bus frequency.
Specifically, when the low-frequency start-up constant value is 0, the default is the first round constant value +0.2 Hz. When the frequency is greater than 65Hz or less than 33Hz, the frequency is abnormal, and all low-frequency logic is locked. When the frequency slip Df/dt is larger than Df3, locking the functions of the wheels of the low-frequency action; when the slip frequency Df1 of the low-frequency 1-wheel action is not more than Df/dt < Df3, the low-frequency 2-wheel action is accelerated, and the low-frequency 2-wheel action is accelerated; when the slip frequency Df2 is less than or equal to Df/dt < Df3 for the low-frequency 1-wheel motion, the low-frequency 2-wheel motion and the low-frequency 3-wheel motion are performed for the low-frequency acceleration, specifically, as shown in the logic diagram of the low-frequency motion in FIG. 5.
The frequency-voltage control calculation module 103 further includes a voltage slip calculation module 1036, a voltage accelerator wheel action module 1037, a low-voltage basic wheel action module 1038, and a low-voltage special wheel action module 1039;
the voltage slip calculation module 1036 is configured to calculate a voltage slip according to the bus voltage value;
the low-voltage basic wheel action module 1037 is used for executing low-voltage load shedding action according to the voltage slip;
the low-voltage basic wheel action module 1038 is used for executing low-voltage load shedding action according to the magnitude of the bus voltage value;
the low-voltage special wheel action module 1039 is configured to perform a low-voltage load shedding action according to the bus voltage value.
It should be noted that, when the input voltage of the output bus voltage is smaller than the preset second threshold, it indicates that the voltage is abnormal, and all the low-voltage logic is locked. When the voltage slip of the low-voltage accelerating wheel action module is greater than a preset first voltage slip threshold value, locking functions of each wheel of low-voltage action; when the low-voltage 1-wheel motion switching frequency slip acquired by the low-voltage accelerating wheel motion module belongs to a preset first voltage slip interval, executing low-voltage accelerating 2-wheel motion, and accelerating the low-voltage 2-wheel motion; when the low-voltage 1-wheel motion switching frequency slip acquired by the low-voltage accelerating wheel motion module belongs to a preset second voltage slip interval, low-voltage 2-wheel and 3-wheel motions are executed, and a low-voltage 2-wheel and a low-voltage 3-wheel of the accelerating motion are executed. The low-voltage basic wheel action module respectively executes low-voltage 1-6 wheel actions according to the change of the bus voltage. The low-voltage special wheel action module respectively executes the actions of the low-voltage special wheel 1 and the low-frequency special wheel 2 according to the change of the bus voltage.
The specific low-pressure action logic diagram is shown in fig. 6, and when the low-pressure starting constant value is 0, the default is the first round constant value +0.03 Un. When the input voltage Urms <0.15Un, the voltage is abnormal, latching all low voltage logic. When the voltage slip Du/dt is larger than Du3, locking the functions of each wheel of low-voltage action; when the low-voltage 1-wheel action switching frequency slip difference Du1 is not more than Du/dt < Du3, the low-voltage accelerates the 2-wheel action, and the low-voltage accelerates the 2-wheel action; when the low-voltage 1-wheel action switching frequency slip difference Du2 is not more than Du/dt < Du3, the low voltage accelerates the 2 and 3 wheels, and the low voltage 2 wheel and the low voltage 3 wheel are accelerated.
In a specific implementation mode, the system further comprises an external control switch connected with the frequency and voltage control and calculation module and used for controlling the high-frequency generator tripping action and the low-frequency low-voltage load shedding action.
In a specific embodiment, the model test of the high-frequency cutting machine model and the low-frequency low-voltage load shedding model is specifically as follows:
1. testing high frequency cutting machine model
TABLE 1 high-frequency cutting machine test definite value table
The high frequency is applied for 1-8 rounds, the frequency of the simulation system is increased from 50Hz to 54Hz with a slip of 1Hz/s, and the operation of each round is shown in FIG. 7. As can be seen from wave recording, each round of independent delay action is 0.2s, and the design requirements are met.
2. Testing of low frequency load shedding models
TABLE 2 Low-frequency load-shedding test constant value table
The low frequency derating test results shown in fig. 8-10, run in low frequency 1-6 wheels, special 1, 2 wheels, and 2 wheels of accelerator. The following cases were simulated separately:
(1) the simulated system frequency dropped from 50Hz with-1 Hz/s slip to 46Hz, with each run as shown in FIG. 8). Each wheel independently delays the action for 0.2s, and the accelerating wheels do not act, so that the design expectation is met;
(2) the simulated system frequency dropped from 50Hz with a-6 Hz/s slip to 46Hz, with each run as in figure 9). The 2-wheel acceleration and the 2-wheel and 3-wheel acceleration both act for 0.1s, and the design expectation is met;
(3) the frequency of the simulation system is reduced from 50Hz to 46Hz with the slip of minus 10Hz/s, the operation conditions of all wheels are shown in figure 10), the slip is locked, and all wheels do not operate at low frequency, thereby being in line with the design expectation.
3. Testing of low pressure load shedding models
The set low pressure constant is shown as 3.
TABLE 3 Low-pressure load-shedding test definite value table
The low pressure unloading test result chart shown in fig. 11-13, low pressure 1-6 wheels, special 1-2 wheels, and 2 wheels of accelerator are put into use. The following cases were simulated separately:
(1) the analog system voltage drops from 1.0Un to 0.7Un with a slip of-0.2 Un/s, with each wheel operating as in fig. 11). Each wheel independently delays the action for 0.2s, and the accelerating wheels do not act, so that the design expectation is met;
(2) the analog system voltage drops from 1.0Un to 0.7Un with a slip of-0.6 Un/s, with each wheel operating as in fig. 12). The 2-wheel acceleration and the 2-wheel and 3-wheel acceleration both act for 0.1s, and the design expectation is met;
(3) the voltage of the analog system is reduced to 0.7Un from 1.0Un by-1.3 Un/s of slip, the operation condition of each wheel is as shown in figure 13), the slip is locked, and each wheel does not operate at low voltage, thus meeting the design expectation.
The above is an embodiment of the apparatus of the present application, and the present application further includes an embodiment of a modeling method for frequency-voltage control, as shown in fig. 3, where fig. 3 includes:
301. calculating the frequency and voltage value of the bus voltage;
302. respectively calculating and calculating frequency slip and voltage slip according to the frequency and voltage value of the bus voltage;
303. executing high-frequency cutting action and low-frequency load shedding action according to the frequency of the bus voltage;
304. and executing low-voltage load shedding action according to the voltage value of the bus.
In a specific embodiment, the method further comprises the following steps: and executing low-frequency acceleration wheel action and low-frequency load shedding action of the low-frequency basic wheel according to the frequency of the bus voltage and the magnitude of the frequency slip.
According to the bus voltage value and the voltage slip, executing low-voltage accelerating wheel action and low-frequency load shedding action of a low-voltage basic wheel
The present application encompasses all of the functions of various frequency voltage control devices, including high frequency chopping, low frequency low voltage load shedding, and the like. The frequency and voltage control function completely simulates the action logic and the action turn setting of the actual device, and the action characteristic consistent with the actual device can be realized. The voltage and the frequency of the accurate model of the frequency-voltage control device are calculated through a universal module of the RTDS, so that the calculation amount of the module is reduced; the frequency slip and the voltage slip can be accurately calculated through the accurate model of the frequency voltage control device, and slip locking logic and low-frequency and low-voltage accelerator wheel logic are realized.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (9)
1. A frequency-voltage control apparatus, comprising:
the RTDS phase-locked loop module, the RTDS voltage effective value calculating module and the frequency voltage control calculating module;
the RTDS phase-locked loop module is used for calculating the voltage phase and the frequency of a bus and inputting the voltage phase and the frequency of the bus to the frequency-voltage control calculation module;
the RTDS voltage effective value calculation module is used for calculating a bus voltage value and inputting the bus voltage value to the frequency voltage control calculation module;
the frequency and voltage control calculation module is used for executing high-frequency generator tripping action and low-frequency low-voltage load shedding action according to the voltage phase, the frequency and the voltage value of the bus.
2. The frequency-voltage control device of claim 1, wherein the frequency-voltage control calculation module comprises a frequency slip module, a low-frequency accelerator wheel action module, a low-frequency basic wheel action module, and a low-frequency special wheel action module; the control action and the control effect of each module are consistent with those of an actual device;
the frequency slip module is used for calculating frequency slip according to the voltage frequency of the bus;
the low-frequency accelerating wheel action module is used for executing low-frequency load shedding action according to the frequency slip value;
the low-frequency basic wheel action module is used for executing low-frequency load shedding action according to the voltage frequency of the bus and the frequency slip value;
the low-frequency special wheel action module is used for executing low-frequency load shedding action according to the voltage frequency of the bus.
3. The frequency-voltage control device of claim 1, wherein the frequency-voltage control calculation module further comprises a voltage slip calculation module, a low-voltage basic wheel action module, and a low-voltage special wheel action module; the control action and the control effect of each module are consistent with those of an actual device;
the voltage slip calculation module is used for calculating voltage slip according to the bus voltage value;
the low-voltage basic wheel action module is used for executing low-voltage load shedding action according to the voltage slip;
the low-voltage basic wheel action module is used for executing low-voltage load shedding action according to the bus voltage value;
the low-voltage special wheel action module is used for executing low-voltage load shedding action according to the bus voltage value.
4. The frequency-voltage control device of claim 1, further comprising an external control switch connected to the frequency-voltage control calculation module for controlling the high frequency tripping operation and the low frequency low voltage load shedding operation.
5. A modeling method for frequency-voltage control, comprising:
calculating the frequency and voltage value of the bus voltage;
respectively calculating and calculating frequency slip and voltage slip according to the frequency and voltage value of the bus voltage;
executing high-frequency cutting action and low-frequency load shedding action according to the frequency of the bus voltage;
and executing low-voltage load shedding action according to the voltage value of the bus.
6. The method of claim 5, further comprising performing a low frequency accelerating wheel action and a low frequency de-rating action of a low frequency fundamental wheel based on a frequency of a bus voltage and a magnitude of the frequency slip.
7. The method of claim 5, further comprising performing a low-voltage accelerating wheel action and a low-voltage basic wheel low-frequency load shedding action according to a bus voltage value and a magnitude of the voltage slip.
8. A frequency-voltage control device, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the frequency voltage control modeling method of any one of claims 5-7 according to instructions in the program code.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium is configured to store a program code for performing the frequency voltage control modeling method of any one of claims 5-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011239842.4A CN112350329A (en) | 2020-11-09 | 2020-11-09 | Frequency voltage control device and modeling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011239842.4A CN112350329A (en) | 2020-11-09 | 2020-11-09 | Frequency voltage control device and modeling method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112350329A true CN112350329A (en) | 2021-02-09 |
Family
ID=74430128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011239842.4A Pending CN112350329A (en) | 2020-11-09 | 2020-11-09 | Frequency voltage control device and modeling method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112350329A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381418A (en) * | 2021-06-24 | 2021-09-10 | 广东电网有限责任公司 | Low-frequency low-voltage load reduction method and device based on bus group judgment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1426149A (en) * | 2001-12-17 | 2003-06-25 | 秦明亮 | Automatic low frequency (low voltage) load reducing control new mode and its synchronizing calculation method |
| CN103618377A (en) * | 2013-12-03 | 2014-03-05 | 长园深瑞继保自动化有限公司 | Automatic bus transfer equipment system and automatic bus transfer method used for transformer substation to which small power supply is connected |
| CN104701852A (en) * | 2015-03-24 | 2015-06-10 | 北京四方继保自动化股份有限公司 | Low-frequency load reduction system and method |
| CN110390180A (en) * | 2019-08-30 | 2019-10-29 | 南方电网科学研究院有限责任公司 | A kind of detection system and method that cutting load influences grid stability |
-
2020
- 2020-11-09 CN CN202011239842.4A patent/CN112350329A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1426149A (en) * | 2001-12-17 | 2003-06-25 | 秦明亮 | Automatic low frequency (low voltage) load reducing control new mode and its synchronizing calculation method |
| CN103618377A (en) * | 2013-12-03 | 2014-03-05 | 长园深瑞继保自动化有限公司 | Automatic bus transfer equipment system and automatic bus transfer method used for transformer substation to which small power supply is connected |
| CN104701852A (en) * | 2015-03-24 | 2015-06-10 | 北京四方继保自动化股份有限公司 | Low-frequency load reduction system and method |
| CN110390180A (en) * | 2019-08-30 | 2019-10-29 | 南方电网科学研究院有限责任公司 | A kind of detection system and method that cutting load influences grid stability |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381418A (en) * | 2021-06-24 | 2021-09-10 | 广东电网有限责任公司 | Low-frequency low-voltage load reduction method and device based on bus group judgment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Liu et al. | A multiagent system-based protection and control scheme for distribution system with distributed-generation integration | |
| Knap et al. | Sizing of an energy storage system for grid inertial response and primary frequency reserve | |
| Kundur | Power system stability | |
| Liu et al. | The healing touch: Tools and challenges for smart grid restoration | |
| Delfino et al. | Black-start and restoration of a part of the Italian HV network: modelling and simulation of a field test | |
| Issicaba et al. | Adequacy and security evaluation of distribution systems with distributed generation | |
| CN105576660B (en) | Local distribution network in-circuit emulation analytical equipment and system | |
| Nedd et al. | Containing a credible loss to within frequency stability limits in a low-inertia GB power system | |
| CN102982230A (en) | Short circuit current exceeding auxiliary decision method based on node impedance sensitivity | |
| Lu et al. | Study of applying load shedding scheme with dynamic D-factor values of various dynamic load models to Taiwan power system | |
| CN106921177B (en) | Low voltage ride through control method and device of wind generating set and simulation system | |
| Crolla et al. | Methodology for testing loss of mains detection algorithms for microgrids and distributed generation using real-time power hardware-in-the-loop based technique | |
| CN108448566A (en) | A kind of electric system on-line mixing emulation mode and system | |
| CN112350329A (en) | Frequency voltage control device and modeling method thereof | |
| CN103063983A (en) | On-line mixing determination method of primary system and secondary system of power distribution network | |
| O'Sullivan et al. | Determining and implementing an approach to system frequency and inertial response in the Ireland and Northern Ireland power system | |
| CN116206499A (en) | Power equipment scene simulation method and device for power grid maintenance training | |
| Croce et al. | Operation and management of the electric system for industrial plants: an expert system prototype for load-shedding operator assistance | |
| Muzik et al. | Frequency and voltage stability assessment of a power system during emergency service states | |
| Santos et al. | Real-time closed loop system controlled by an Artificial Neural Network for estimation of the optimal load shedding | |
| Shafiullah et al. | Study of impacts on operation of island and frequency based auto load shedding to improve service reliability using CYME PSAF | |
| Hassan et al. | Under-Frequency Load Shedding: Towards a smarter smart house with a consumer level controller | |
| Thomée | Lithium-Ion battery storage for frequency control | |
| Solvang | Dynamic simulations of simultaneous hvdc contingencies in the nordic power system considering system integrity protection schemes | |
| Rovnyak et al. | Performance index and classifier approaches to real-time, discrete-event control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210209 |