CN110390180B - System and method for detecting influence of cut load on power grid stability - Google Patents
System and method for detecting influence of cut load on power grid stability Download PDFInfo
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Abstract
The invention discloses a detection system for the influence of load shedding on the stability of a power grid, which is applied to RTDS and comprises the following components: the power grid real-time simulation digital model is used for establishing a simulation power transmission network so as to simulate the operation characteristics of the power grid; the parameter acquisition module is used for calculating the voltage and the current frequency of an alternating current bus in the analog power transmission network; the N low-frequency basic wheels are used for outputting load shedding parameters according to corresponding load shedding strategies when the received frequency is lower than a preset frequency threshold value of the low-frequency basic wheels; the M low-voltage basic wheels are used for outputting load shedding parameters according to corresponding load shedding strategies when the received voltage is lower than a preset voltage threshold value of the low-voltage basic wheels; the load shedding module is used for cutting load of the load module according to the load shedding parameters; the stability verification module is used for verifying the stability of the power grid. By applying the scheme, the detection cost is reduced, and excessive hardware wiring is avoided. The application also discloses a detection method for the influence of the cut load on the stability of the power grid, and the detection method has a corresponding effect.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to a system and a method for detecting influence of cut load on grid stability.
Background
With the rapid development of economy and society, electric power has become an indispensable secondary energy source for national economy and people's life. In the event of a major power failure, the system power may be unbalanced and the frequency and/or voltage may drop, and at this time, a low-frequency low-voltage load shedding device, or referred to as a low-frequency low-voltage load shedding device, is required to maintain the safety and stability of the system.
The low-frequency low-voltage load shedding device can detect the voltage and the frequency of the installation position of the device, and when the frequency and/or the voltage of the power system are reduced due to the lack of active and reactive power, the low-frequency low-voltage load shedding device can automatically cut off part of load so as to re-balance the power supply and the load of the system. The low-frequency low-voltage load shedding device is used as a third defense line of the power system, is largely installed in substations with voltage levels below 220kV of the power system, and the load shedding objects comprise 110kV direct supply lines, 35kV/10kV distribution lines, main transformer low-voltage sides and the like.
The verification of the load shedding function of the low-frequency low-voltage load shedding device means that after the low-frequency low-voltage load shedding device performs load shedding, the stability of the power system is verified, so that whether the related load shedding strategy can be effectively implemented is judged. In the conventional scheme, when verifying the influence of the cut load on the stability of the power grid, the electric energy output of the power grid is usually simulated through an RTDS (Real Time Digital Simulator, real-time digital simulator), and then the RTDS is connected with a low-frequency low-voltage load shedding device, so that the influence of the cut load on the stability of the power grid is detected. However, because the hardware wiring between the RTDS and the low-frequency low-voltage load shedding device is complex, this method is very inconvenient in implementation, and especially when the number of basic wheels and other components arranged in the low-frequency low-voltage load shedding device is large, the wiring complexity of the staff and the wiring time consumption are further improved. Furthermore, it is possible to provide a device for the treatment of a disease. When the RTDS is connected with the low-frequency low-voltage load shedding device, the RTDS is required to be isolated by utilizing an optical fiber and a photoelectric conversion device, and the cost is high.
In summary, how to detect the influence of the cut load on the stability of the power grid more conveniently, reduce the detection cost, and avoid excessive hardware wiring is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a system and a method for detecting the influence of cut load on the stability of a power grid, which can more conveniently detect the influence of cut load on the stability of the power grid, reduce the detection cost and avoid excessive hardware wiring.
In order to solve the technical problems, the invention provides the following technical scheme:
a detection system for the influence of cut load on the stability of a power grid is applied to a real-time digital simulator (RTDS), and comprises the following components:
the power grid real-time simulation digital model is used for establishing a simulation power transmission network so as to simulate the operation characteristics of the power grid;
the parameter acquisition module is connected with the power grid real-time simulation digital model and is used for calculating the voltage of an alternating current bus and the frequency of current in the simulation power transmission network;
the N low-frequency basic wheels are connected with the parameter acquisition module, and are used for outputting load shedding parameters according to the load shedding strategy of the low-frequency basic wheels when the received frequency is lower than the preset frequency threshold value of the low-frequency basic wheels;
m low-voltage basic wheels, wherein each low-voltage basic wheel is connected with the parameter acquisition module and is used for outputting load shedding parameters according to the load shedding strategy of the low-voltage basic wheel when the received voltage is lower than the preset voltage threshold value of the low-voltage basic wheel; m and N are positive integers;
the load shedding modules are respectively connected with the N low-frequency basic wheels, the M low-voltage basic wheels and the load modules and are used for cutting loads of the load modules according to the received load shedding parameters;
the load module;
and the stability verification module is connected with the power grid real-time simulation digital model and is used for verifying the stability of the power grid after the load is cut off by the load module.
Preferably, the method further comprises:
p low-frequency special wheels, wherein each low-frequency special wheel is connected with the parameter acquisition module and the load shedding module and is used for outputting load shedding parameters according to a load shedding strategy of the low-frequency special wheel when the received frequency is lower than a preset frequency threshold value of the low-frequency special wheel; p is a positive integer.
Preferably, the method further comprises:
the frequency change calculation module is connected with the parameter acquisition module and is used for calculating the frequency change rate of the current;
the low-frequency acceleration wheel module is connected with the frequency change calculation module and the N low-frequency basic wheels and is used for adjusting the load shedding strategies of the N low-frequency basic wheels when the frequency change rate is lower than a preset frequency change rate threshold value.
Preferably, the method further comprises:
the X low-voltage special wheels are connected with the parameter acquisition module and the load shedding module, and are used for outputting load shedding parameters according to the load shedding strategy of the low-voltage special wheels when the received voltage is lower than the preset voltage threshold value of the low-voltage special wheels; x is a positive integer.
Preferably, the method further comprises:
the voltage change calculation module is connected with the parameter acquisition module and is used for calculating the voltage change rate of the alternating current bus;
the low-voltage acceleration wheel module is connected with the voltage change calculation module and the M low-voltage basic wheels and is used for adjusting the load shedding strategies of the M low-voltage basic wheels when the voltage change rate is lower than a preset voltage change rate threshold value.
Preferably, the stability verification module is specifically configured to:
and monitoring the voltage, the current and the frequency of the analog power transmission network in real time, and determining that the load shedding influences the stability of the power grid when the voltage, the current or the frequency of any alternating current bus exceeds a corresponding threshold value, the voltage, the current or the frequency of any power transmission line exceeds a corresponding threshold value and the voltage, the current or the frequency of any transformer exceeds any one of the corresponding threshold values after the load shedding of the load shedding module.
Preferably, the stability verification module is further configured to: and verifying the stability of the power grid after the load module cuts the load, and outputting prompt information when the stability is verified to be not in accordance with the preset index.
Preferably, the parameter obtaining module is specifically configured to: and calculating the voltage of an alternating current bus and the frequency of current in the analog power transmission network through a phase-locked loop module.
A detection method for the influence of cut load on the stability of a power grid is applied to a real-time digital simulator (RTDS), and comprises the following steps:
the method comprises the steps that a power grid real-time simulation digital model is used for establishing a simulation power transmission network so as to simulate the operation characteristics of the power grid;
the parameter acquisition module connected with the power grid real-time simulation digital model calculates the voltage of an alternating current bus and the frequency of current in the simulation power transmission network;
the N low-frequency basic wheels are connected with the parameter acquisition module, and when the received frequency is lower than a preset frequency threshold value of the low-frequency basic wheel, the load shedding parameters are output according to the load shedding strategy of the low-frequency basic wheel;
m low-voltage basic wheels, wherein each low-voltage basic wheel is connected with the parameter acquisition module, and when the received voltage is lower than a preset voltage threshold value of the low-voltage basic wheel, the load shedding parameters are output according to the load shedding strategy of the low-voltage basic wheel; m and N are positive integers;
the load shedding modules are respectively connected with the N low-frequency basic wheels, the M low-voltage basic wheels and the load modules, and load shedding is carried out on the load modules according to the received load shedding parameters;
and the stability verification module is connected with the power grid real-time simulation digital model and verifies the stability of the power grid after the load module cuts the load.
Preferably, the method further comprises:
the frequency change calculation module is connected with the parameter acquisition module and used for calculating the frequency change rate of the current;
the low-frequency acceleration wheel module acquires the frequency change rate, and adjusts the load shedding strategies of N low-frequency basic wheels when the frequency change rate is lower than a preset frequency change rate threshold value.
In the scheme of the application, the RTDS is directly used for detecting the influence of load shedding on the stability of the power grid, namely, the RTDS is not required to be connected with a low-frequency low-voltage load shedding device, so that excessive hardware wiring can be avoided, and the cost is reduced. Specifically, the RTDS includes: the power grid real-time simulation digital model is used for establishing a simulation power transmission network so as to simulate the operation characteristics of the power grid; the parameter acquisition module is used for calculating the voltage of an alternating current bus and the frequency of current in the analog power transmission network; the N low-frequency basic wheels are used for outputting load shedding parameters according to the load shedding strategy of the low-frequency basic wheels when the received frequency is lower than the preset frequency threshold value of the low-frequency basic wheels; m low-voltage basic wheels, which are used for outputting load shedding parameters according to the load shedding strategy of the low-voltage basic wheels when the received voltage is lower than the preset voltage threshold value of the low-voltage basic wheels; the load shedding module is used for cutting load of the load module according to the received load shedding parameters; a load module; and the stability verification module is used for verifying the stability of the power grid after the load module cuts off the load. Therefore, the scheme of the application can conveniently detect the influence of the cut load on the stability of the power grid, reduces the detection cost and avoids excessive hardware wiring.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a system for detecting the effect of load shedding on grid stability according to the present invention;
FIG. 2 is a schematic diagram of another structure of the system for detecting the influence of load shedding on the stability of a power grid according to the present invention;
fig. 3 is a flowchart of an implementation of the method for detecting the influence of the cut load on the stability of the power grid in the present invention.
Detailed Description
The core of the invention is to provide a detection system for the influence of the cut load on the stability of the power grid, which can conveniently detect the influence of the cut load on the stability of the power grid, reduce the detection cost and avoid excessive hardware wiring.
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a detection system for detecting an influence of a cut load on a grid stability, where the detection system is applied to a real-time digital simulator RTDS, and includes:
the grid real-time simulation digital model 10 is used to build a simulated power transmission network to simulate the operating characteristics of the grid.
Typically, the real-time simulation digital model 10 of the power grid simulates a 220KV bus voltage signal of an actual power grid through a digital signal.
And the parameter acquisition module 20 is connected with the power grid real-time simulation digital model 10 and is used for calculating the voltage magnitude of an alternating current bus and the frequency magnitude of current in the analog power transmission network.
When the parameter obtaining module 20 calculates the voltage magnitude of the ac bus and the frequency magnitude of the current in the analog power transmission network, the circuit structure based on the voltage magnitude and the frequency magnitude of the current may be set and selected according to the needs, for example, may be a phase-locked loop structure, that is, the parameter obtaining module 20 may be specifically configured to: the voltage of an alternating current bus and the frequency of the current in the analog power transmission network are calculated through a phase-locked loop module.
And N low-frequency basic wheels, wherein each low-frequency basic wheel is connected with the parameter acquisition module 20 and is used for outputting load shedding parameters according to the load shedding strategy of the low-frequency basic wheel when the received frequency is lower than the preset frequency threshold value of the low-frequency basic wheel.
The low-frequency basic wheels have respective load shedding strategies, for example, different trigger delays, different preset frequency thresholds and the like. The low frequency base wheel 7 wheel 30 depicted in fig. 1, i.e. representing 7 low frequency base wheels, may also be referred to as low frequency 1 wheel, low frequency 2 wheel … low frequency 7 wheel in turn. Of course, in other embodiments, there may be other numbers of low frequency base wheels without affecting the practice of the invention. Each low-frequency basic wheel has a respective load shedding strategy, for example, when the frequency received by the low-frequency 1 wheel is lower than the preset frequency threshold value 49.8Hz of the low-frequency 1 wheel, judging whether the duration is longer than 200ms according to the load shedding strategy of the low-frequency 1 wheel, and outputting a load shedding proportion of 10% if 200ms is reached.
M low-voltage basic wheels, each of which is connected with the parameter acquisition module 20 and is used for outputting load shedding parameters according to the load shedding strategy of the low-voltage basic wheel when the received voltage is lower than the preset voltage threshold value of the low-voltage basic wheel; m and N are positive integers.
Similar to the low frequency basic wheel, each low voltage basic wheel also has a respective load shedding strategy, for example, different trigger delays, different preset voltage thresholds, and the like. The low pressure base wheel 7 wheel 40 depicted in fig. 1, i.e. representing 7 low pressure base wheels, may also be referred to as low pressure 1 wheel, low pressure 2 wheel … low pressure 7 wheel in turn. For example, when the voltage received by the low-voltage 1 round is lower than the preset pressure threshold 215KV of the low-voltage 1 round, judging whether the duration is longer than 100ms according to the load shedding strategy of the low-voltage 1 round, and outputting a load shedding proportion of 10% if the duration is 100 ms; and for example, when the voltage received by the low-voltage 2 wheel is lower than the preset pressure threshold 210KV of the low-voltage 2 wheel, judging whether the duration is longer than 200ms according to the load shedding strategy of the low-voltage 2 wheel, and outputting a load shedding proportion of 20% if the duration is longer than 200 ms.
The load shedding module 50 is respectively connected with the N low-voltage basic wheels, the M low-voltage basic wheels and the load module 60, and is used for cutting load of the load module 60 according to the received load shedding parameters.
A load module 60.
A stability verification module 70 connected to the grid real-time simulation digital model 10 is used to verify the stability of the grid after the load module 60 cuts the load.
The load shedding parameters generally have two forms of load shedding proportion and load shedding amount, which can be selected according to the needs, but it is to be noted that when a certain form is selected, each low-voltage basic wheel and each low-voltage basic wheel can output the load shedding parameters in the form.
The load shedding module 50 performs statistics on the received load shedding parameters, that is, the load shedding module 50 sums the received load shedding parameters, so as to cut the load of the load module 60 according to the summation result. It should be noted that, when the load shedding module 50 performs load shedding on the load module 60, it is generally required to follow the principle of overspecking, for example, according to the received load shedding parameter, the load shedding module 50 determines that 50% of the load needs to be shed, while the line a in the load model occupies 10% of the load, the line B occupies 10% of the load, and the line C occupies 35% of the load, and when the load shedding is performed, if only the line a and the line B are shed, and the requirement of 50% of the load shedding is not satisfied, all the lines a, B and C need to be shed, and the total load of 55% is shed. That is, when the actual load to be removed cannot be equal to the determined load to be removed, then the actual load to be removed should be greater than the load to be removed.
The load module 60 may be a ZIP load module 60, i.e. a load model in which a constant impedance model, a constant current model and a constant power model are combined according to a certain ratio.
After the load module 60 cuts off the load, the stability verification module 70 may verify the stability of the grid, i.e., based on the grid data. In particular, the verification of the stability of the grid may be performed by voltage, current, frequency, i.e. in one embodiment of the invention the stability verification module 70 may be specifically configured to:
the voltage, current and frequency of the analog power transmission network are monitored in real time, after the load module 60 cuts the load, when the voltage, current or frequency of any alternating current bus exceeds a corresponding threshold value, the voltage, current or frequency of any power transmission line exceeds a corresponding threshold value, and when the voltage, current or frequency of any transformer exceeds any one of the corresponding threshold values, the load cutting effect on the stability of the power grid is determined.
For example, if the voltage of a certain ac bus exceeds a preset voltage threshold for judging the stability of the bus, the load shedding strategy is determined to affect the stability of the power grid, and if the current on a certain transformer exceeds a preset current threshold for judging the stability of the transformer, the load shedding strategy is determined to affect the stability of the power grid. In addition, in some cases, the stability can be verified by combining power.
In the scheme of the application, the RTDS is directly used for detecting the influence of load shedding on the stability of the power grid, namely, the RTDS is not required to be connected with a low-frequency low-voltage load shedding device, so that excessive hardware wiring can be avoided, and the cost is reduced. Specifically, the RTDS includes: a grid real-time simulation digital model 10 for building a simulated power transmission network to simulate the operating characteristics of the grid; the parameter acquisition module 20 is used for calculating the voltage magnitude of an alternating current bus and the frequency magnitude of current in the analog power transmission network; the N low-frequency basic wheels are used for outputting load shedding parameters according to the load shedding strategy of the low-frequency basic wheels when the received frequency is lower than the preset frequency threshold value of the low-frequency basic wheels; m low-voltage basic wheels, which are used for outputting load shedding parameters according to the load shedding strategy of the low-voltage basic wheels when the received voltage is lower than the preset voltage threshold value of the low-voltage basic wheels; load shedding module 50 for shedding load to load module 60 according to the received load shedding parameters; a load module 60; the stability verification module 70 is configured to verify the stability of the power grid after the load module 60 cuts the load. Therefore, the scheme of the application can conveniently detect the influence of the cut load on the stability of the power grid, reduces the detection cost and avoids excessive hardware wiring.
In one embodiment of the present invention, the method further comprises:
the P low-frequency special wheels are connected with the parameter acquisition module 20 and the load shedding module 50, and are used for outputting load shedding parameters according to the load shedding strategy of the low-frequency special wheels when the received frequency is lower than the preset frequency threshold value of the low-frequency special wheels; p is a positive integer.
In the partial load shedding strategy, besides the low-frequency and low-voltage basic wheels, one or more low-frequency special wheels are arranged, so that in the embodiment, P low-frequency special wheels are also arranged in a detection system for the influence of the load shedding on the stability of the power grid, and the influence of the related load shedding strategy on the stability of the power grid is verified.
Specifically, each low-frequency special wheel is connected to the parameter obtaining module 20 and the load shedding module 50, and is configured to output the load shedding parameter according to the load shedding policy of the low-frequency special wheel when the received frequency is lower than the preset frequency threshold of the low-frequency special wheel. The workflow of the low-frequency special wheel can refer to the low-frequency basic wheel, and the value of the relevant parameter in the load shedding strategy of the low-frequency special wheel is generally different from the value of the low-frequency basic wheel to a certain extent. The low frequency special wheel 2 wheel 81 depicted in fig. 2, indicates that P is 2, i.e. comprises a low frequency special 1 wheel as well as a low frequency special 2 wheel. In other embodiments, P may have other values.
In one embodiment of the present invention, the method further comprises:
a frequency change calculation module 91 connected to the parameter acquisition module 20, for calculating a frequency change rate of the current;
the low-frequency acceleration wheel module 92 is connected with the frequency change calculation module 91 and the N low-frequency basic wheels, and is configured to adjust the load shedding policy of the N low-frequency basic wheels when the frequency change rate is lower than a preset frequency change rate threshold.
In this embodiment, the frequency change calculation module 91 calculates the frequency change rate of the bus current, and the low-frequency acceleration wheel module 92 is connected to the frequency change calculation module 91 and the N low-frequency basic wheels, and when the frequency change rate is lower than a preset frequency change rate threshold, the load shedding policy of the N low-frequency basic wheels is adjusted. For example, when the frequency change rate is lower than the preset frequency change rate threshold value a, the load shedding strategy is adjusted for the low-frequency 2 wheel and the low-frequency 3 wheel in the low-frequency basic wheel, specifically, for example, the low-frequency 2 wheel and the low-frequency 3 wheel are directly triggered, that is, preconditions required when the low-frequency 2 wheel and the low-frequency 3 wheel output the load shedding parameters in a default state are ignored. For another example, the value of the trigger delay in the load shedding strategies of the low-frequency 2-wheel, the low-frequency 3-wheel and the low-frequency 4-wheel is reduced.
In one embodiment of the present invention, the method further comprises:
x low-voltage special wheels, each of which is connected with the parameter acquisition module 20 and the load shedding module 50, and is used for outputting load shedding parameters according to the load shedding strategy of the low-voltage special wheel when the received voltage is lower than the preset voltage threshold value of the low-voltage special wheel; x is a positive integer.
In the same frequency, one or more low-voltage special wheels can be arranged in the load shedding strategy, so in the implementation mode, X low-voltage special wheels are also arranged in a detection system for the influence of the load shedding on the stability of the power grid, and the influence of the related load shedding strategy on the stability of the power grid is verified. The workflow of the low-voltage special wheel can refer to the low-voltage basic wheel, and only certain differences exist in the set values of related parameters, such as differences of voltage thresholds, differences of trigger delays in the load shedding strategies, and the like. The low pressure special wheel 2 wheel 82 depicted in fig. 2 is shown with X being 2, i.e. comprising a low pressure special 1 wheel as well as a low pressure special 2 wheel. In other specific cases, X may have other values
In one embodiment of the present invention, the method further comprises:
the voltage change calculation module 93 is connected with the parameter acquisition module 20 and is used for calculating the voltage change rate of the alternating current bus;
the low-voltage acceleration wheel module 94 is connected to the voltage change calculation module 93 and the M low-voltage basic wheels, and is configured to adjust the load shedding strategy of the M low-voltage basic wheels when the voltage change rate is lower than a preset voltage change rate threshold.
In this embodiment, the voltage change rate of the ac bus is calculated by the voltage change calculation module, and the load shedding strategies of the low voltage acceleration wheel module 94, the voltage change calculation module 93 and the M low voltage basic wheels are adjusted when the voltage change rate is lower than a preset voltage change rate threshold.
Further, the stability verification module 70 may also be configured to: after the load module 60 cuts the load, the stability of the power grid is verified, and when the stability is verified to be not in accordance with the preset index, a prompt message is output, so that a worker can timely notice the abnormal condition of the detection result.
Corresponding to the system embodiment above, the embodiment of the invention also provides a method for detecting the influence of the cut load on the stability of the power grid, which can be correspondingly referred to above.
Referring to fig. 3, a flowchart of an implementation of a method for detecting an influence of a cut load on grid stability in the present invention is shown, where the method is applied to a real-time digital simulator RTDS, and includes:
step S301: the method comprises the steps that a power grid real-time simulation digital model is used for establishing a simulation power transmission network so as to simulate the operation characteristics of the power grid;
step S302: the parameter acquisition module connected with the power grid real-time simulation digital model calculates the voltage of an alternating current bus and the frequency of current in the simulation power transmission network;
step S303: n low-frequency basic wheels, wherein each low-frequency basic wheel is connected with a parameter acquisition module, and when the received frequency is lower than a preset frequency threshold value of the low-frequency basic wheel, the load shedding parameters are output according to the load shedding strategy of the low-frequency basic wheel;
step S304: m low-voltage basic wheels, wherein each low-voltage basic wheel is connected with a parameter acquisition module, and when the received voltage is lower than a preset voltage threshold value of the low-voltage basic wheel, the load shedding parameters are output according to a load shedding strategy of the low-voltage basic wheel; m and N are positive integers;
step S305: the load shedding modules are respectively connected with the N low-frequency basic wheels, the M low-voltage basic wheels and the load shedding modules, and load shedding is carried out on the load shedding modules according to the received load shedding parameters;
step S306: and the stability verification module is connected with the power grid real-time simulation digital model and verifies the stability of the power grid after the load module cuts the load.
In one embodiment of the present invention, the method further comprises:
the frequency change calculation module is connected with the parameter acquisition module and used for calculating the frequency change rate of the current;
the low-frequency acceleration wheel module acquires the frequency change rate, and adjusts the load shedding strategies of the N low-frequency basic wheels when the frequency change rate is lower than a preset frequency change rate threshold value.
In one embodiment of the present invention, the method further comprises:
the voltage change calculation module is connected with the parameter acquisition module and used for calculating the voltage change rate of the alternating current bus;
the low-voltage acceleration wheel module obtains the voltage change rate, and adjusts the load shedding strategies of M low-voltage basic wheels when the voltage change rate is lower than a preset voltage change rate threshold.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The principles and embodiments of the present invention have been described herein with reference to specific examples, but the description of the examples above is only for aiding in understanding the technical solution of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. The utility model provides a detection system that cut load to electric wire netting stability influence, its characterized in that is applied to in real-time digital simulator RTDS, includes:
the power grid real-time simulation digital model is used for establishing a simulation power transmission network so as to simulate the operation characteristics of the power grid;
the parameter acquisition module is connected with the power grid real-time simulation digital model and is used for calculating the voltage of an alternating current bus and the frequency of current in the simulation power transmission network;
the N low-frequency basic wheels are connected with the parameter acquisition module, and are used for outputting load shedding parameters according to the load shedding strategy of the low-frequency basic wheels when the received frequency is lower than the preset frequency threshold value of the low-frequency basic wheels;
m low-voltage basic wheels, wherein each low-voltage basic wheel is connected with the parameter acquisition module and is used for outputting load shedding parameters according to the load shedding strategy of the low-voltage basic wheel when the received voltage is lower than the preset voltage threshold value of the low-voltage basic wheel; m and N are positive integers;
the load shedding modules are respectively connected with the N low-frequency basic wheels, the M low-voltage basic wheels and the load modules and are used for cutting loads of the load modules according to the received load shedding parameters;
the load module;
and the stability verification module is connected with the power grid real-time simulation digital model and is used for verifying the stability of the power grid after the load is cut off by the load module.
2. The system for detecting the effect of load shedding on grid stability according to claim 1, further comprising:
p low-frequency special wheels, wherein each low-frequency special wheel is connected with the parameter acquisition module and the load shedding module and is used for outputting load shedding parameters according to a load shedding strategy of the low-frequency special wheel when the received frequency is lower than a preset frequency threshold value of the low-frequency special wheel; p is a positive integer.
3. The system for detecting the effect of load shedding on grid stability according to claim 2, further comprising:
the frequency change calculation module is connected with the parameter acquisition module and is used for calculating the frequency change rate of the current;
the low-frequency acceleration wheel module is connected with the frequency change calculation module and the N low-frequency basic wheels and is used for adjusting the load shedding strategies of the N low-frequency basic wheels when the frequency change rate is lower than a preset frequency change rate threshold value.
4. The system for detecting the effect of load shedding on grid stability according to claim 1, further comprising:
the X low-voltage special wheels are connected with the parameter acquisition module and the load shedding module, and are used for outputting load shedding parameters according to the load shedding strategy of the low-voltage special wheels when the received voltage is lower than the preset voltage threshold value of the low-voltage special wheels; x is a positive integer.
5. The system for detecting the effect of load shedding on grid stability according to claim 4, further comprising:
the voltage change calculation module is connected with the parameter acquisition module and is used for calculating the voltage change rate of the alternating current bus;
the low-voltage acceleration wheel module is connected with the voltage change calculation module and the M low-voltage basic wheels and is used for adjusting the load shedding strategies of the M low-voltage basic wheels when the voltage change rate is lower than a preset voltage change rate threshold value.
6. The system for detecting the effect of load shedding on the stability of a power grid according to claim 1, wherein the stability verification module is specifically configured to:
and monitoring the voltage, the current and the frequency of the analog power transmission network in real time, and determining that the load shedding influences the stability of the power grid when the voltage, the current or the frequency of any alternating current bus exceeds a corresponding threshold value, the voltage, the current or the frequency of any power transmission line exceeds a corresponding threshold value and the voltage, the current or the frequency of any transformer exceeds any one of the corresponding threshold values after the load shedding of the load shedding module.
7. The system for detecting the effect of load shedding on grid stability according to claim 6, wherein the stability verification module is further configured to: and verifying the stability of the power grid after the load module cuts the load, and outputting prompt information when the stability is verified to be not in accordance with the preset index.
8. The system for detecting the influence of load shedding on the stability of a power grid according to claim 1, wherein the parameter acquisition module is specifically configured to: and calculating the voltage of an alternating current bus and the frequency of current in the analog power transmission network through a phase-locked loop module.
9. The method for detecting the influence of the cut load on the stability of the power grid is characterized by being applied to a real-time digital simulator (RTDS), and comprises the following steps:
the method comprises the steps that a power grid real-time simulation digital model is used for establishing a simulation power transmission network so as to simulate the operation characteristics of the power grid;
the parameter acquisition module connected with the power grid real-time simulation digital model calculates the voltage of an alternating current bus and the frequency of current in the simulation power transmission network;
the N low-frequency basic wheels are connected with the parameter acquisition module, and when the received frequency is lower than a preset frequency threshold value of the low-frequency basic wheel, the load shedding parameters are output according to the load shedding strategy of the low-frequency basic wheel;
m low-voltage basic wheels, wherein each low-voltage basic wheel is connected with the parameter acquisition module, and when the received voltage is lower than a preset voltage threshold value of the low-voltage basic wheel, the load shedding parameters are output according to the load shedding strategy of the low-voltage basic wheel; m and N are positive integers;
the load shedding modules are respectively connected with the N low-frequency basic wheels, the M low-voltage basic wheels and the load modules, and load shedding is carried out on the load modules according to the received load shedding parameters;
and the stability verification module is connected with the power grid real-time simulation digital model and verifies the stability of the power grid after the load module cuts the load.
10. The method for detecting the effect of load shedding on the stability of a power grid according to claim 9, further comprising:
the frequency change calculation module is connected with the parameter acquisition module and used for calculating the frequency change rate of the current;
the low-frequency acceleration wheel module acquires the frequency change rate, and adjusts the load shedding strategies of N low-frequency basic wheels when the frequency change rate is lower than a preset frequency change rate threshold value.
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