CN109167374B - Distributed power grid voltage stability control method, device, equipment and storage medium - Google Patents
Distributed power grid voltage stability control method, device, equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a voltage stabilization control method for a distributed power grid, which can comprehensively utilize the load increase speed of each voltage stabilization controller to determine the load margin value of each voltage stabilization controller, and then utilize the load margin value and the voltage stabilization controllers to stably control the distributed power grid. On one hand, the load increase conditions of each voltage stabilizing controller in the whole distributed power grid are comprehensively considered. On the other hand, effective coordination is performed among the voltage stabilization controllers. The stability of controlling the voltage of the distributed power grid is guaranteed, and the stable operation of the whole distributed power grid is guaranteed. In addition, the invention also discloses a distributed power grid voltage stability control device, equipment and a storage medium, and the effect is as above.
Description
Technical Field
The invention relates to the field of power grids, in particular to a distributed power grid voltage stability control method, a distributed power grid voltage stability control device and a storage medium.
Background
With the continuous progress of scientific technology, the coupling degree of power grids in China is more and more compact, the operation mode of the power grids is more and more complex, and the stability of the voltage of the distributed power grids is the core for ensuring the dispatching operation of the power grids. Therefore, controlling the voltage of the distributed power grid to be in a stable state is an important condition for ensuring the normal operation of power grid dispatching.
At present, in a traditional voltage stabilization control method for a distributed power grid, each voltage stabilization controller in the distributed power grid executes a control command according to a self state to control the voltage of the distributed power grid, but according to the method, each voltage stabilization controller executes a respective control command, on one hand, the voltage at a position in the power grid where each voltage stabilization controller is located is only controlled, and the overall situation of the whole distributed power grid is not comprehensively considered. On the other hand, the voltage stabilization controllers lack effective coordination, and information sharing and mutual constraint cannot be performed between the voltage stabilization controllers. Therefore, the stability of controlling the voltage of the distributed power grid cannot be guaranteed, and the stable operation of the whole distributed power grid cannot be guaranteed.
Therefore, how to ensure the stability of controlling the voltage of the distributed power grid to ensure the stable operation of the whole distributed power grid is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a method, a device, equipment and a storage medium for stably controlling the voltage of a distributed power grid, so that the stability of controlling the voltage of the distributed power grid is ensured, and the stable operation of the whole distributed power grid is ensured.
In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:
first, an embodiment of the present invention provides a method for controlling voltage stability of a distributed power grid, including:
acquiring the load increase speed of the position of each voltage stabilization controller in the distributed power grid;
determining a load increase speed factor of each voltage stabilizing controller according to each load increase speed;
determining a load margin value of each voltage stabilization controller according to each load increase speed factor and a preset load margin total amount;
and performing stable control on the voltage of the distributed power grid by using each load margin value and the voltage stabilizing controller.
Preferably, the determining the load increase speed factor of each voltage stabilization controller according to each load increase speed includes:
determining a minimum load increase rate among the load increase rates;
setting a load increase speed factor corresponding to the minimum load increase speed as a standard factor;
and respectively calculating the product of the ratio of each load increasing speed to the minimum load increasing speed and the standard factor to obtain the load increasing speed factor of each voltage stabilizing controller.
Preferably, the determining the load margin value of each voltage stabilization controller according to each load increase speed factor and a preset total load margin includes:
calculating the sum of each of the load increase rate factors;
and respectively calculating the product of the ratio of each load increase speed factor to the sum value and the total load margin to obtain the load margin value of each power grid stability controller.
Preferably, the stabilizing the distributed power grid voltage by using each of the load margin values and the voltage stabilizing controller includes:
acquiring an actual load margin value of each voltage stabilization controller in the distributed power grid;
judging whether each actual load margin value is smaller than a load margin value corresponding to each voltage stabilization controller;
and if so, taking the voltage stabilization controller with the actual load margin value smaller than the load margin value as a voltage stabilization controller to be started, and starting the voltage stabilization controller to stably control the voltage of the distributed power grid.
Preferably, before the starting of the voltage stabilization controller to be started, the method further includes:
calculating the time delay of the voltage stabilizing controller to be started;
judging whether the trigger time of the voltage stabilization controller to be started is greater than the time delay or not;
and if so, starting the voltage stabilization controller to be started.
Preferably, the calculating the time delay of the voltage stabilization controller to be started includes:
calculating a load control factor corresponding to the voltage stabilization controller to be started;
determining a load increase speed factor corresponding to the voltage stabilization controller to be started;
determining an equality relation among an actual load margin value, a time delay to be solved and a load margin value of the voltage stabilization controller to be started, the load control factor and/or the load increase speed factor;
and solving the time delay to be solved according to the equality relation to obtain the time delay.
Preferably, the calculating the load control factor corresponding to the voltage stabilization controller to be started includes:
determining a value factor corresponding to the voltage stabilization controller to be started;
determining a maximum value factor and a minimum value factor from the value factors;
determining a minimum load control factor corresponding to the maximum cost factor and a maximum load control factor corresponding to the minimum cost factor;
and calculating the load control factor of the voltage stabilizing controller to be started by utilizing each value factor, the minimum load control factor and the maximum load control factor.
Second, an embodiment of the present invention provides a distributed power grid voltage stabilization control apparatus, including:
the acquisition module is used for acquiring the load increase speed of the position of each voltage stabilization controller in the distributed power grid;
the first determining module is used for determining a load increase speed factor of each voltage stabilizing controller according to each load increase speed;
the second determining module is used for determining the load margin value of each voltage stabilization controller according to each load increase speed factor and the preset total load margin;
and the control module is used for performing stable control on the voltage of the distributed power grid by utilizing each load margin value and the voltage stabilizing controller.
Third, an embodiment of the present invention provides a distributed power grid voltage stabilization control apparatus, including:
a memory for storing a computer program;
a processor for executing the computer program stored in the memory to implement the steps of any of the above mentioned distributed grid voltage stabilization control methods.
Finally, the embodiment of the present invention discloses a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the distributed power grid voltage stabilization control method as described in any one of the above are implemented.
Therefore, according to the voltage stability control method for the distributed power grid disclosed by the embodiment of the invention, firstly, the load increase speed of the position of each voltage stability controller in the distributed power grid is obtained, then the load increase speed factor of each voltage stability controller is determined according to each load increase speed, secondly, the load margin value of each voltage stability controller is determined according to each load increase speed factor and the preset total load margin, and finally, the voltage of the distributed power grid is stably controlled by using each load margin value and the voltage stability controller. Therefore, by adopting the scheme, the load margin value of each voltage stabilizing controller can be determined by comprehensively utilizing the load increasing speed of the position of each voltage stabilizing controller, and then the distributed power grid can be stably controlled by utilizing the load margin value and the voltage stabilizing controllers. On one hand, the load increase conditions of each voltage stabilizing controller in the whole distributed power grid are comprehensively considered. On the other hand, effective coordination is performed among the voltage stabilization controllers. The stability of controlling the voltage of the distributed power grid is guaranteed, and the stable operation of the whole distributed power grid is guaranteed. In addition, the embodiment of the invention also discloses a distributed power grid voltage stability control device, equipment and a storage medium, and the effect is as above.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a distributed power grid voltage stability control method disclosed in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a distributed power grid voltage stabilization control apparatus disclosed in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a distributed power grid voltage stabilization control device disclosed in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a method, a device, equipment and a storage medium for stably controlling voltage of a distributed power grid, which ensure the stability of controlling the voltage of the distributed power grid and the stable operation of the whole distributed power grid.
Referring to fig. 1, fig. 1 is a schematic flow chart of a distributed power grid voltage stabilization control method disclosed in an embodiment of the present invention, where the method includes:
s101, acquiring the load increase speed of the position of each voltage stabilization controller in the distributed power grid.
Specifically, in this embodiment, the voltage stabilizing controller may refer to the prior art, a plurality of voltage stabilizing controllers are distributed in a distributed power grid, each voltage stabilizing controller is located at a load node, an active load exists corresponding to each load node, and the active load of each load node changes with time. If the load increase speed of the load node is too large, the voltage stability of the load node is low, and the voltage stability controller is required to adjust in time.
And S102, determining a load increase speed factor of each voltage stabilization controller according to each load increase speed.
Specifically, in this embodiment, each load node corresponding to each voltage stabilizing controller corresponds to one load increasing speed, and each load increasing speed corresponds to one load increasing speed factor. The load increase speed and the load increase speed factor of each voltage stabilization controller will be explained below. Since the load increase speed includes the maximum load increase speed and the minimum load increase speed, and the minimum load increase speed is used as a reference to obtain the load increase speed factor of each voltage stabilizing controller, as a preferred embodiment, step S102 includes:
the minimum load increase speed among the load increase speeds is determined.
The load increase speed factor corresponding to the minimum load increase speed is set as the standard factor.
And respectively calculating the product of the ratio of each load increasing speed to the minimum load increasing speed and the standard factor to obtain the load increasing speed factor of each voltage stabilizing controller.
Specifically, in this embodiment, it is assumed that there are N load nodes in the distributed power grid, and the load increase rates of the N load nodes are Δ P respectively1，ΔP2，…，ΔPN. Wherein there is a minimum load increase speed Δ P of the N load increase speedsminThen at a minimum load increase rate Δ PminThe load speed increase factor of the load node of the rest of the voltage stabilizing controllers is calculated as a reference (the minimum load increase speed deltap)minThe load speed increase factor (the norm factor) of (1) may be preset). The specific process is as follows: assuming a minimum load growth rate Δ PminIs 1, the load increase rate factors of the remaining load nodes can be calculated by the following formula:
wherein i is 0,1,2,3, …, N, VPiRefers to the load increase speed factor, Δ P, of the ith load nodeiRefers to the load increase speed, Δ P, of the ith load nodeminRefers to the smallest load increase speed among the 1 st to nth load nodes, and 1 refers to the standard factor.
Therefore, the load increase speed factor of the load node corresponding to each voltage stabilizing controller can be calculated through the formula. Obviously, the embodiment of the invention comprehensively considers each voltage stabilization controller in the distributed power grid to obtain the load increase speed factor of each voltage stabilization controller.
And S103, determining the load margin value of each voltage stabilization controller according to each load increase speed factor and the preset total load margin.
Specifically, in this embodiment, the preset total load margin is preset, and the load margin value of the load node where each voltage stabilizing controller is located is distributed according to the proportion of the load increase factor corresponding to each load node. The load margin value of each voltage stabilizing controller in the embodiment of the present invention will be described in detail with reference to the examples given in the above embodiments.
As a preferred embodiment, step S103 includes:
calculating the sum of the load growth speed factors;
and respectively calculating the product of the ratio of each load increase speed factor to the sum and the total load margin to obtain the load margin value of each power grid stability controller.
The concept of the load margin in the embodiment of the present invention may refer to the prior art, and the embodiment of the present invention is not described herein again. Suppose the total amount of load margins in the distributed power grid is
The load margin value that each load node needs to reserve can be calculated using the following formula:
wherein the content of the first and second substances,
for the sum of the load margins, VPallThe sum of the load increase speed factors, P, of all the load nodes corresponding to the respective voltage stabilizing controllersi thIt refers to the load margin value of the ith voltage stabilization controller.
And S104, performing stable control on the voltage of the distributed power grid by using each load margin value and the voltage stabilizing controller.
Specifically, in this embodiment, after obtaining the load margin value corresponding to each voltage stabilization controller, the voltage stabilization controller then performs stabilization control on the voltage of the entire distributed power grid in combination with the load margin value.
Wherein, as a preferred embodiment, step S104 includes:
and acquiring the actual load margin value of each voltage stabilization controller in the distributed power grid.
It is determined whether each actual load margin value is less than the load margin value corresponding to each voltage stabilization controller.
And if so, taking the voltage stabilizing controller with the actual load margin value smaller than the load margin value as a voltage stabilizing controller to be started and starting the voltage stabilizing controller to stably control the voltage of the distributed power grid.
Specifically, in this embodiment, when the distributed power grid is in operation, the load node where each voltage stabilizing controller is located has an actual load margin value, and the actual load margin value is compared with the calculated load margin value corresponding to each voltage stabilizing controller. When the actual load margin value of the voltage stabilization controller is smaller than the calculated load margin value, the voltage stabilization controller can be used as a voltage stabilization controller to be started and is started, and the voltage stabilization controller is controlled to enter a starting state at the moment, namely, the voltage stabilization controller starts to control the voltage in the distributed power grid.
Therefore, according to the voltage stability control method for the distributed power grid disclosed by the embodiment of the invention, firstly, the load increase speed of the position of each voltage stability controller in the distributed power grid is obtained, then the load increase speed factor of each voltage stability controller is determined according to each load increase speed, secondly, the load margin value of each voltage stability controller is determined according to each load increase speed factor and the preset total load margin, and finally, the voltage of the distributed power grid is stably controlled by using each load margin value and the voltage stability controller. Therefore, by adopting the scheme, the load margin value of each voltage stabilizing controller can be determined by comprehensively utilizing the load increasing speed of the position of each voltage stabilizing controller, and then the distributed power grid can be stably controlled by utilizing the load margin value and the voltage stabilizing controllers. On one hand, the load increase conditions of each voltage stabilizing controller in the whole distributed power grid are comprehensively considered. On the other hand, effective coordination is performed among the voltage stabilization controllers. The stability of controlling the voltage of the distributed power grid is guaranteed, and the stable operation of the whole distributed power grid is guaranteed.
The distributed power grid comprises a plurality of voltage stabilizing controllers and other protection devices, a certain time delay can be set for each voltage stabilizing controller in order to avoid the situation that the voltage stabilizing controllers conflict with the other protection devices, and when the voltage stabilizing controllers are triggered, if the triggering time reaches the time delay, the voltage stabilizing controllers are restarted to avoid the conflict between the voltage stabilizing controllers and the other protection devices. Therefore, based on the above embodiment, as a preferred embodiment, before starting the voltage stabilization controller to be started, the method further includes:
and calculating the time delay of the voltage stabilization controller to be started.
And judging whether the trigger time of the voltage stabilization controller to be started is greater than the time delay.
If yes, starting the voltage stabilization controller to be started.
In order to comprehensively consider the overall situation of the voltage stabilizing controller to be started in the distributed power grid and mutually constrain and coordinate with each other, as a preferred embodiment, the calculating the time delay of the voltage stabilizing controller to be started comprises:
and calculating a load control factor corresponding to the voltage stabilization controller to be started.
And determining a load increase speed factor corresponding to the voltage stabilizing controller to be started.
And determining an equality relation between the actual load margin value of the voltage stabilizing controller to be started, the time delay to be solved and the load margin value and the ground and the control factor and/or the load increase speed increase factor.
And solving the time delay to be solved according to the equality relation to obtain the time delay.
In order to comprehensively consider each voltage stabilization controller to be started so as to ensure mutual coordination among the voltage stabilization controllers to be started, based on the above embodiment, as a preferred embodiment, calculating the load control factor corresponding to the voltage stabilization controller to be started includes:
and determining a value factor corresponding to the voltage stabilization controller to be started.
A maximum merit factor and a minimum merit factor are determined from the merit factors.
A minimum load control factor corresponding to the maximum merit factor and a maximum load control factor corresponding to the minimum merit factor are determined.
And calculating the load control factor of the voltage stabilizing controller to be started by utilizing each value factor, the minimum load control factor and the maximum load control factor.
The load control factor in this embodiment represents the degree of control over the voltage stabilization controller, the value factor represents the degree of importance of the voltage stabilization controller, and the value factor can be determined according to the layout structure in the entire distributed power grid. The value factor and the load control factor mentioned in the embodiments of the present invention are explained in detail below. Assuming voltage stabilization controlThe value factor of the load node where the controller is located is IMiI represents the ith voltage stabilizing controller in the distributed power grid, and each value factor IMiIn which there is a maximum value factor IMmaxAnd a minimum value factor IMminDefining a maximum value factor IMmaxThe corresponding minimum load control factor is CPmin(in the embodiment of the present invention, the minimum load control factor is preferably 1), and a minimum value factor IM is definedminThe corresponding maximum load control factor is CPmax(in the embodiment of the present invention, the maximum load control factor is preferably 1.5), and then the maximum cost factor IM is usedmaxMinimum value factor IMminMinimum load control factor CPminAnd the value factors of other voltage stabilizing controllers calculate the load control factors CP of the load nodes corresponding to the other voltage stabilizing controllersiThe calculation expression is as follows:
wherein i is 1,2,3,4, …, N.
After obtaining the load control factor of each voltage stabilization controller, the time delay of each voltage stabilization controller can be calculated by using the following formula:
wherein, t0Denoted the moment at which the voltage stabilizing controller is triggered, τ denotes the time delay, Pi marginThe actual load margin value of the voltage stabilizing controller is shown. CiTime constants are shown. Depending on the type of voltage stabilizing controller, CiThe way of calculation of (c) is also different. Following time constant CiThe calculation of (b) is explained in detail below.
For a local voltage stabilization controller that accounts for equalization, time constant CiCan be calculated using the following equation:
Ci＝K·VPi
for a voltage stabilization controller that accounts for load importance, time constant CiCan be calculated using the following equation:
Ci＝K·IMi·VPi·CPi
in the above two time constant calculation formulas, K is an adjustment factor.
The logic of the balanced local voltage stabilization controller can enable the integral constant term C of the load with high growth speediLarge, slow rate of increase load integral constant term CiAnd the time delay tau of the load control at different growth speeds is the same, namely, the local synchronous starting control is performed, and the autonomous decoupling control of each local voltage stabilizing controller is completed. However, in actual control, the balanced voltage stabilization controller is too ideal (not generally adopted), and in the embodiment of the present invention, it is preferable that the time constant of the voltage stabilization controller considering the importance of the load is calculated, and in the calculation of the time constant of the voltage stabilization controller considering the importance of the load, the time constant C is calculated as the load is more importantiThe larger the value of (a), the more time is required for the integrated value to reach the value, so that the control is started later and the control operation is performed first for the load with low load importance.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a distributed power grid voltage stabilization control apparatus according to an embodiment of the present invention, where the apparatus includes:
an obtaining module 201, configured to obtain a load increase speed at a location where each voltage stabilization controller in the distributed power grid is located;
a first determining module 202, configured to determine a load increase speed factor of each voltage stabilization controller according to each load increase speed;
a second determining module 203, configured to determine a load margin value of each voltage stabilization controller according to each load increase speed factor and a preset total load margin;
and the control module 204 is configured to perform stable control on the distributed power grid voltage by using each load margin value and the voltage stability controller.
Therefore, according to the voltage stabilization control device for the distributed power grid disclosed by the embodiment of the invention, firstly, the load increase speed of the position of each voltage stabilization controller in the distributed power grid is obtained, then the load increase speed factor of each voltage stabilization controller is determined according to each load increase speed, secondly, the load margin value of each voltage stabilization controller is determined according to each load increase speed factor and the preset total load margin, and finally, the voltage of the distributed power grid is subjected to stabilization control by using each load margin value and each voltage stabilization controller. Therefore, by adopting the scheme, the load margin value of each voltage stabilizing controller can be determined by comprehensively utilizing the load increasing speed of the position of each voltage stabilizing controller, and then the distributed power grid can be stably controlled by utilizing the load margin value and the voltage stabilizing controllers. On one hand, the load increase conditions of each voltage stabilizing controller in the whole distributed power grid are comprehensively considered. On the other hand, effective coordination is performed among the voltage stabilization controllers. The stability of controlling the voltage of the distributed power grid is guaranteed, and the stable operation of the whole distributed power grid is guaranteed.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a distributed power grid voltage stabilization control apparatus according to an embodiment of the present invention, including:
a memory 301 for storing a computer program;
a processor 302 for executing a computer program stored in a memory to implement the steps of the distributed grid voltage stabilization control method mentioned in any of the above embodiments.
Since the steps of the distributed power grid voltage stabilization control method provided in any of the above embodiments can be implemented by calling the computer program stored in the memory through the processor, the distributed power grid voltage stabilization control device provided in this embodiment has the same practical effect as the above distributed power grid voltage stabilization control method.
In order to better understand the present solution, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the distributed grid voltage stabilization control method mentioned in any of the above embodiments.
The computer-readable storage medium provided in this embodiment may have the same practical effects as the above-mentioned distributed power grid voltage stabilization control method, because the steps of the distributed power grid voltage stabilization control method provided in any of the above-mentioned embodiments may be implemented by a processor calling a computer program stored in the computer-readable storage medium.
The method, the device, the equipment and the storage medium for controlling the voltage stability of the distributed power grid provided by the application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Claims (6)
1. A distributed power grid voltage stability control method is characterized by comprising the following steps:
acquiring the load increase speed of the position of each voltage stabilization controller in the distributed power grid;
determining a load increase speed factor of each voltage stabilizing controller according to each load increase speed;
determining a load margin value of each voltage stabilization controller according to each load increase speed factor and a preset load margin total amount;
performing stable control on the voltage of the distributed power grid by using each load margin value and the voltage stabilizing controller;
the determining a load increase rate factor of each of the voltage stabilizing controllers according to each of the load increase rates includes:
determining a minimum load increase rate among the load increase rates;
setting a load increase speed factor corresponding to the minimum load increase speed as a standard factor;
respectively calculating the product of the ratio of each load increasing speed to the minimum load increasing speed and the standard factor to obtain a load increasing speed factor of each voltage stabilizing controller;
the load increase speed factor of each of the voltage stabilization controllers is calculated by the following formula:
wherein i is 0,1,2,3, …, N, VPiRefers to the load increase speed factor, Δ P, of the ith load nodeiRefers to the load increase speed, Δ P, of the ith load nodeminThe smallest load increase speed from the 1 st load node to the Nth load node is referred to, and 1 refers to a standard factor;
the determining the load margin value of each voltage stabilization controller according to each load increase speed factor and a preset total load margin amount includes:
calculating the sum of each of the load increase rate factors;
respectively calculating the product of the ratio of each load increase speed factor to the sum value and the total load margin to obtain the load margin value of each voltage stabilization controller;
the load margin value of each voltage stabilization controller is calculated by the following formula:
wherein the content of the first and second substances,
for the sum of the load margins, VPallThe sum of the load increase speed factors, P, for all load nodes corresponding to the respective voltage stabilizing controllersi thIt refers to the load margin value of the ith voltage stabilization controller.
2. The distributed power grid voltage stabilization control method according to any one of claims 1, wherein the stabilizing control of the distributed power grid voltage by using each of the load margin values and the voltage stabilization controller comprises:
acquiring an actual load margin value of each voltage stabilization controller in the distributed power grid;
judging whether each actual load margin value is smaller than a load margin value corresponding to each voltage stabilization controller;
and if so, taking the voltage stabilization controller with the actual load margin value smaller than the load margin value as a voltage stabilization controller to be started, and starting the voltage stabilization controller to stably control the voltage of the distributed power grid.
3. The distributed power grid voltage stabilization control method according to claim 2, further comprising, before starting the voltage stabilization controller to be started:
calculating the time delay of the voltage stabilizing controller to be started;
judging whether the trigger time of the voltage stabilization controller to be started is greater than the time delay or not;
if yes, starting the voltage stabilization controller to be started;
the calculating the time delay of the voltage stabilization controller to be started comprises:
calculating a load control factor corresponding to the voltage stabilization controller to be started;
determining a load increase speed factor corresponding to the voltage stabilization controller to be started;
determining an equality relation among an actual load margin value, a time delay to be solved and a load margin value of the voltage stabilization controller to be started, the load control factor and/or the load increase speed factor;
solving the time delay to be solved according to the equality relation to obtain the time delay;
the calculating the load control factor corresponding to the voltage stabilization controller to be started comprises:
determining a value factor corresponding to the voltage stabilization controller to be started;
determining a maximum value factor and a minimum value factor from the value factors;
determining a minimum load control factor corresponding to the maximum cost factor and a maximum load control factor corresponding to the minimum cost factor;
calculating a load control factor of the voltage stabilizing controller to be started by using each value factor, the minimum load control factor and the maximum load control factor;
and calculating a load control factor of the voltage stabilization controller to be started, wherein the calculation expression is as follows:
wherein, i is 1,2,3,4, …, N, CPiLoad control factor, IM, for the load node corresponding to the ith voltage stabilizing controlleriValue factors for the load node in which the voltage stabilizing controller is located, the respective value factor IMiIn which there is a maximum value factor IMmaxAnd a minimum value factor IMmin，CPminIs the maximum value factor IMmaxCorresponding minimum load control factor, CPmaxIs a minimum value factor IMminA corresponding maximum load control factor;
calculating the time delay of the voltage stabilization controller to be started, wherein the calculation expression is as follows:
wherein, t0Denoted the moment at which the voltage stabilizing controller is triggered, τ denotes the time delay, Pi marginRepresenting the actual load margin value, C, of the voltage stabilizing controlleriTime constants are shown.
4. A distributed power grid voltage stabilization control apparatus, comprising:
the acquisition module is used for acquiring the load increase speed of the position of each voltage stabilization controller in the distributed power grid;
the first determining module is used for determining a load increase speed factor of each voltage stabilizing controller according to each load increase speed;
the second determining module is used for determining the load margin value of each voltage stabilization controller according to each load increase speed factor and the preset total load margin;
the control module is used for performing stable control on the voltage of the distributed power grid by utilizing each load margin value and the voltage stabilizing controller;
the determining a load increase rate factor of each of the voltage stabilizing controllers according to each of the load increase rates includes:
determining a minimum load increase rate among the load increase rates;
setting a load increase speed factor corresponding to the minimum load increase speed as a standard factor;
respectively calculating the product of the ratio of each load increasing speed to the minimum load increasing speed and the standard factor to obtain a load increasing speed factor of each voltage stabilizing controller;
the load increase speed factor of each of the voltage stabilization controllers is calculated by the following formula:
wherein i is 0,1,2,3, …, N, VPiRefers to the load increase speed factor, Δ P, of the ith load nodeiRefers to the load increase speed, Δ P, of the ith load nodeminThe smallest load increase speed from the 1 st load node to the Nth load node is referred to, and 1 refers to a standard factor;
the determining the load margin value of each voltage stabilization controller according to each load increase speed factor and a preset total load margin amount includes:
calculating the sum of each of the load increase rate factors;
respectively calculating the product of the ratio of each load increase speed factor to the sum value and the total load margin to obtain the load margin value of each voltage stabilization controller;
the load margin value of each voltage stabilization controller is calculated by the following formula:
wherein the content of the first and second substances,
for the sum of the load margins, VPallThe sum of the load increase speed factors, P, for all load nodes corresponding to the respective voltage stabilizing controllersi thIt refers to the load margin value of the ith voltage stabilization controller.
5. A distributed grid voltage stabilization control apparatus, comprising:
a memory for storing a computer program;
a processor for executing a computer program stored in the memory to implement the steps of the distributed grid voltage stabilization control method according to any one of claims 1 to 3.
6. A computer-readable storage medium, having a computer program stored thereon, the computer program being executable by a processor to implement the steps of the distributed grid voltage stabilization control method according to any one of claims 1 to 3.
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| CN201811131179.9A CN109167374B (en) | 2018-09-27 | 2018-09-27 | Distributed power grid voltage stability control method, device, equipment and storage medium |
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