CN107834571B - Rural power grid low-voltage treatment method and system - Google Patents
Rural power grid low-voltage treatment method and system Download PDFInfo
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- CN107834571B CN107834571B CN201711262591.XA CN201711262591A CN107834571B CN 107834571 B CN107834571 B CN 107834571B CN 201711262591 A CN201711262591 A CN 201711262591A CN 107834571 B CN107834571 B CN 107834571B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The application discloses a rural power grid low-voltage treatment method which comprises the steps of obtaining load voltage of a load node; judging whether the load voltage is lower than a preset threshold value or not; if yes, determining a voltage regulating parameter of the voltage regulating device according to the load voltage; sending the voltage regulating parameters to a voltage regulating device so that the voltage regulating device regulates the load voltage according to the voltage regulating parameters; the voltage regulating device comprises a feeder reactive compensation device, and the voltage regulating parameter of the feeder reactive compensation device is a feeder reactive compensation quantity. This application can adjust through the pressure regulating parameter of control regulator when the low-voltage condition appears through the load voltage of monitoring analysis load node, utilizes feeder reactive power compensator to be close to the advantage of load node so that the low-voltage problem of load node obtains effectual solution, improves treatment effect. The application also discloses rural power grids low voltage treatment system, has above-mentioned beneficial effect equally.
Description
Technical Field
The application relates to the technical field of power distribution networks, in particular to a rural power grid low-voltage treatment method and system.
Background
With the gradual improvement of the living standard of farmers in China, the corresponding power distribution facilities can not meet the power utilization requirements of rural areas more and more, so that the problem of low voltage of rural power grids is more and more prominent, and accidents such as damage of power utilization equipment, power failure in regional areas and the like caused by the low voltage cause serious influence on normal living power utilization of users.
In the prior art, a method of carrying out reactive compensation by using a bus reactive compensation device or adjusting the transformation ratio of a distribution transformer in a distribution line is generally adopted to solve the problem of low voltage of a rural power grid, but an ideal and accurate adjusting effect cannot be obtained usually. This is because the distance between the bus reactive compensation device and the load node is not ideal for the final treatment effect because the loss on the distribution line is reduced by the compensation and regulation effect.
Therefore, the technical problem to be solved urgently by the technical personnel in the field is to adopt the rural power grid low-voltage treatment method to improve the treatment effect.
Disclosure of Invention
The application aims to provide a rural power grid low-voltage treatment method and system so as to improve the treatment effect.
In order to solve the technical problem, the application provides a rural power grid low-voltage treatment method, which comprises the following steps:
acquiring a load voltage of a load node;
judging whether the load voltage is lower than a preset threshold value or not;
if yes, determining a voltage regulating parameter of a voltage regulating device according to the load voltage;
sending the voltage regulating parameter to the voltage regulating device so that the voltage regulating device can regulate the load voltage according to the voltage regulating parameter;
the voltage regulating device comprises a feeder reactive compensation device, and the voltage regulating parameter of the feeder reactive compensation device is a feeder reactive compensation quantity.
Optionally, the voltage regulating device further comprises a bus reactive power compensation device and a distribution transformer;
the voltage regulating parameter of the bus reactive power compensation device is a bus reactive power compensation quantity; and the voltage regulating parameter of the distribution transformer is transformer transformation ratio.
Optionally, the distribution transformer is an on-load tap changer.
Optionally, the method further comprises:
and a filtering device is arranged between the compensation point of the feeder reactive compensation device and a load so as to improve the quality of electric energy.
Optionally, the method further comprises:
sending the load voltage to automatic power grid voltage control equipment; and the automatic power grid voltage control equipment can adjust the switching number of the transformers of the transformer substation in the area according to the load voltage.
Optionally, the determining the voltage regulation parameter of the voltage regulation device according to the load voltage includes:
and determining the voltage regulating parameters of the voltage regulating device according to the load voltage by adopting a tabu search algorithm.
Optionally, the determining, by using a tabu search algorithm, the voltage regulating parameter of the voltage regulating device according to the load voltage includes:
determining a target function of low-voltage treatment, the current value of the voltage regulating parameter, the satisfied constraint condition and the taboo length;
determining fitness according to the objective function;
performing neighborhood movement on the current value to generate a neighborhood movement set of the current value, wherein the neighborhood movement set meets the constraint condition; the neighborhood moving set does not comprise a tabu object of which the iteration number is less than the tabu length;
determining a median value with optimal fitness in the neighborhood mobile set;
judging whether the fitness of the intermediate value is better than the current value;
if yes, determining the intermediate value as an updated current value, a target value and a taboo object;
if not, determining the intermediate value as the updated current value;
judging whether an iteration termination condition is met;
if yes, determining the target value as a finally output pressure regulating parameter of the pressure regulating device;
if not, continuing to execute the subsequent step of carrying out variable change on the current value and generating a neighborhood moving set of the current value meeting the constraint condition.
Optionally, the objective function is:
ξ＝min{max[λ(Fa)+λ(Fb)]}；
wherein ξ is the objective function value;
Uithe load voltage of the ith load node; u shapeiNThe rated voltage of the ith load node; u shapeimaxIs UiMaximum value of (d); u shapeiminIs UiMinimum value of (d); n is the total number of the load nodes; s is an adjustment coefficient; liThe number of times of actions of the voltage regulating device of the ith load node;
the constraint conditions are as follows:
wherein, PGiIs the active power output of the generator; pLiIs the active consumption of the load node; gijIs the conductance; b isijIs susceptance; thetaijIs the voltage phase angle; qGiIs the reactive power output of the generator; qLiIs the reactive power consumption of the load node; qCiThe reactive compensation quantity of the load node i; qGmaxAnd QGminAre respectively QGiMaximum and minimum values of; qCmaxAnd QCminAre respectively QCiMaximum and minimum values of.
The application also provides a rural power grids low-voltage treatment system, includes:
voltage monitor: the load voltage monitoring device is used for monitoring the load voltage of each load node; and sending the voltage to regional distribution network reactive voltage optimization operation control equipment;
the regional distribution network reactive voltage optimization operation control equipment comprises: the load voltage of the load node is obtained; judging whether the load voltage is lower than a preset threshold value or not; when the load voltage is lower than the preset threshold, determining a voltage regulating parameter of a voltage regulating device according to the load voltage; sending the voltage regulating parameters to the voltage regulating device;
the pressure regulating device is characterized in that: the load voltage is adjusted according to the voltage adjusting parameter; the voltage regulating device comprises a feeder reactive compensation device, and the voltage regulating parameter of the feeder reactive compensation device is the feeder reactive compensation quantity.
Optionally, the method further comprises:
automatic control equipment of the grid voltage: and the system is used for receiving and regulating the switching quantity of the transformers of the regional transformer substation according to the load voltage sent by the regional distribution network reactive voltage optimization operation control equipment.
The rural power grid low-voltage treatment method comprises the following steps: acquiring a load voltage of a load node; judging whether the load voltage is lower than a preset threshold value or not; if yes, determining a voltage regulating parameter of a voltage regulating device according to the load voltage; sending the voltage regulating parameter to the voltage regulating device so that the voltage regulating device can regulate the load voltage according to the voltage regulating parameter; the voltage regulating device comprises a feeder reactive compensation device, and the voltage regulating parameter of the feeder reactive compensation device is a feeder reactive compensation quantity.
Therefore, compared with the prior art, in the rural power grid low-voltage treatment method, the load voltage of the load node is monitored and analyzed, and the voltage can be adjusted by controlling the voltage adjusting parameters of the voltage adjusting device when the low-voltage condition occurs. Because the voltage regulating device that this application adopted is including installing the feeder reactive power compensator on the feeder, therefore can utilize its advantage of being close to the load node to make the low voltage problem of load node obtain effectual solution, improve the treatment effect. The rural power grid low-voltage treatment system can achieve the rural power grid low-voltage treatment method and also has the beneficial effects.
Drawings
In order to more clearly illustrate the technical solutions in the prior art and the embodiments of the present application, the drawings that are needed to be used in the description of the prior art and the embodiments of the present application will be briefly described below. Of course, the following description of the drawings related to the embodiments of the present application is only a part of the embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the provided drawings without any creative effort, and the obtained other drawings also belong to the protection scope of the present application.
Fig. 1 is a flowchart of a rural power grid low-voltage treatment method provided in the embodiment of the present application;
fig. 2 is a flowchart illustrating a process of determining a voltage regulation parameter of a voltage regulation device according to a load voltage by using a tabu search algorithm according to an embodiment of the present disclosure;
fig. 3 is a block diagram of a rural power grid low-voltage treatment system according to an embodiment of the present application.
Detailed Description
The core of the application is to provide a rural power grid low-voltage treatment method and system so as to effectively improve the treatment effect.
In order to more clearly and completely describe the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all 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 of a rural power grid low-voltage treatment method according to an embodiment of the present application, which mainly includes the following steps:
step 11: and acquiring the load voltage of the load node.
Specifically, the load voltage can be collected by a voltage monitor or other equipment; in addition, for convenience of communication, a Voltage monitor in a wireless communication mode, such as TLKS-PLDV, may perform wireless communication with a DAVC (Distributed Automatic Voltage Control, regional distribution network reactive Voltage optimization operation Control device) by using a network server through an IEC61850 communication protocol, and transmit the collected load Voltage to the DAVC.
Step 12: judging whether the load voltage is lower than a preset threshold value or not; if yes, go to step 3.
Specifically, the preset threshold may be selected and set by a person skilled in the art according to the electricity utilization condition and the electricity utilization quality of the local area, which is not limited in the embodiment of the present application.
Step 13: determining a voltage regulating parameter of the voltage regulating device according to the load voltage; the voltage regulating device comprises a feeder reactive compensation device, and the voltage regulating parameter of the feeder reactive compensation device is a feeder reactive compensation quantity.
Step 14: and sending the voltage regulating parameters to a voltage regulating device so that the voltage regulating device regulates the load voltage according to the voltage regulating parameters.
Specifically, in the rural power grid low-voltage treatment method provided by the embodiment of the application, the voltage regulating device for performing low-voltage treatment includes a feeder reactive power compensation device, that is, a reactive power compensation device installed on a feeder. Of course, other types of voltage regulating devices can be used in addition to the feeder reactive compensation device. In the process of power distribution, a bus is a connecting line of voltage distribution devices at all levels in a regional substation, and a connecting line of electrical equipment such as a transformer and the like and corresponding distribution devices, and a feeder is a distribution line which is distributed from the bus and is directly connected to a load, so that the feeder reactive compensation device is positioned at the position, closest to the load, of the tail end of a distribution network line, and the reactive compensation is performed on the feeder on the low-voltage condition of a load node on the feeder, so that a good treatment effect can be obtained.
Of course, the feeder reactive power compensation device may be a parallel capacitor, or may also be other reactive power compensation devices such as SVG, which is not limited in this application.
Therefore, in the rural power grid low-voltage treatment method provided by the embodiment of the application, the load voltage of the load node is monitored and analyzed, and the regulation can be performed by controlling the voltage regulation parameter of the voltage regulation device when the low-voltage condition occurs. Because the voltage regulating device that this application adopted is including installing the feeder reactive power compensator on the feeder, therefore can utilize its advantage of being close to the load node to make the low voltage problem of load node obtain effectual solution, improve the treatment effect.
The rural power grid low-voltage treatment method provided by the application is based on the embodiment as follows:
as a preferred embodiment, the voltage regulating device further comprises a bus reactive compensation device and a distribution transformer;
the voltage regulating parameter of the bus reactive power compensation device is a bus reactive power compensation quantity; the voltage regulating parameter of the distribution transformer is the transformer transformation ratio.
As mentioned above, the voltage regulating device used in the embodiments of the present application may further include a bus reactive compensation device to compensate for reactive voltage on the bus, so as to improve the utilization of power at the load node supplied by the bus. In addition, in the regional distribution process, the distribution transformer undertakes the transformation task of 10kV to 0.4kV of 10kV electricity output by the regional transformer substation, so that the transformed electric energy is transmitted to a load node of a user. Therefore, when the voltage at the load node is too low, the load voltage can also be increased by adjusting the transformer ratio of the distribution transformer.
In a preferred embodiment, the distribution transformer is an on-load tap changer.
Specifically, when the distribution transformer is an on-load tap changing transformer, namely, the on-load tap changing transformer can finish tap voltage switching in the load operation process, so that the load voltage is adjusted, and the stability of the power consumption of a user is kept.
In addition, in order to monitor the working state of the distribution Transformer, a TTU (distribution Transformer supervisory Terminal) may be further used to collect information of the distribution Transformer, monitor the operating condition of the distribution Transformer in real time, and transmit the operating condition to the DAVC.
As a preferred embodiment, further comprising:
and a filtering device is arranged between a compensation point of the feeder reactive compensation device and a load so as to improve the quality of electric energy.
Specifically, the user power quality can be further improved by using a filter device, for example, a filter device such as an APF (active power filter), an LC filter, or an LCR filter can be used. The APF is a novel power electronic device for dynamically inhibiting harmonic waves and compensating reactive power, can quickly track and compensate harmonic waves with different sizes and frequencies, separates each harmonic wave from reactive power, controls and actively outputs the size, the frequency and the phase of current, quickly responds, offsets corresponding current in a load, realizes dynamic tracking compensation, and compensates both the harmonic waves and the reactive power.
As a preferred embodiment, further comprising:
sending the load Voltage to an Automatic power grid Voltage Control (AVC); therefore, the automatic grid voltage control equipment can adjust the switching number of the transformer substations in the region according to the load voltage.
Specifically, when the shortage of the load voltage in the local area is large, the local power supply needs to be adjusted. Specifically, the DAVC can send the load voltage of the area to a control center of the whole power grid power supply, namely AVC, and the AVC adjusts the switching quantity of the transformer substation in the area according to the condition so as to adjust the low voltage by voltage adjusting devices such as a feeder reactive compensation device and the like on the basis of adjusting the area power distribution well. AVC is one of new technologies for modern power grid dispatching development, and can regulate and control excitation of a generator, output of a transformer substation and a tap joint of a transformer under a given voltage constraint condition, so that reactive power injected into a power grid is gradually close to an optimal value required by the power grid, and the whole power grid has a near-optimal reactive voltage flow.
As a preferred embodiment, the determining the voltage regulating parameter of the voltage regulating device according to the load voltage comprises:
and determining the voltage regulating parameters of the voltage regulating device according to the load voltage by adopting a tabu search algorithm.
The taboo search algorithm can effectively avoid cycle trapping in the search process due to the taboo algorithm thought, and has better search performance.
In particular, all local search algorithms have the disadvantage of being too extensive to search for a certain local area and its neighbourhood, resulting in a leaf-shadow. The idea of the tabu search algorithm is to mark the already solved locally optimal solutions during the search and to avoid these locally optimal solutions in a further predetermined number of iterations. To find a global optimal solution, a tabu search is a search area that intentionally avoids a portion of the found local optimal solution, and thus, more. These local optimal solutions that need to be temporarily avoided can be determined as tabu objects, and when the number of iterations is smaller than the tabu length, the search for the tabu objects is avoided, so as to obtain more optimal solutions in other ranges.
Referring to fig. 2, fig. 2 is a flow chart of determining a voltage regulation parameter of a voltage regulation device according to a load voltage by using a tabu search algorithm, and the method includes the following steps:
step 21: and determining an objective function of low-voltage governance, the current value of the voltage-regulating parameter, the satisfied constraint condition and the taboo length.
In particular, as previously mentioned, the voltage regulation parameters may include a feeder reactive compensation amount of the feeder reactive compensation device, a bus reactive compensation amount of the bus reactive compensation device, and a transformer transformation ratio of the distribution transformer. The current values of the voltage regulation parameters are used for generating a neighborhood moving set in each iteration process so as to carry out searching comparison, and the current values can be randomly generated when the algorithm is initially started.
Step 22: and determining the fitness according to the objective function.
Specifically, the fitness is an index used for measuring the pressure regulating parameter to make the objective function take a good value, and can be specifically set by a person skilled in the art according to the objective function.
Step 23: performing neighborhood movement on the current value to generate a neighborhood movement set of the current value, wherein the neighborhood movement set meets constraint conditions; the neighborhood move set does not include tabu objects whose iteration number is less than the tabu length.
If the taboo length is N, once the value of a certain group of pressure regulating parameters is determined as a taboo object, the values of the group of pressure regulating parameters cannot be searched again in the next N times of iteration processes so as to avoid falling into local optimal circular search.
Step 24: and determining the intermediate value with the optimal fitness in the neighborhood moving set.
Step 25: judging whether the fitness of the intermediate value is better than the current value; if yes, go to step 26; if not, go to step 27.
Step 26: the intermediate value is determined as the updated current value, target value and taboo object.
Step 27: the intermediate value is determined as the updated current value.
Step 28: judging whether an iteration termination condition is met; if yes, go to step 29; if not, go to step 23.
Step 29: and determining the target value as the finally output pressure regulating parameter of the pressure regulating device.
As a preferred embodiment, the objective function is:
ξ＝min{max[λ(Fa)+λ(Fb)]}；
wherein ξ is the objective function value;
Uithe load voltage of the ith load node; u shapeiNThe rated voltage of the ith load node; u shapeimaxIs UiMaximum value of (d); u shapeiminIs UiMinimum value of (d); n is the total number of the load nodes; s is an adjustment coefficient; liThe number of times of actions of the voltage regulating device of the ith load node;
the constraint conditions are as follows:
wherein, PGiIs the active power output of the generator; pLiIs the active consumption of the load node; gijIs the conductance; b isijIs susceptance; thetaijIs the voltage phase angle; qGiIs the reactive power output of the generator; qLiIs the reactive power consumption of the load node; qCiThe reactive compensation quantity of the load node i; qGmaxAnd QGminAre respectively QGiMaximum sum ofA minimum value; qCmaxAnd QCminAre respectively QCiMaximum and minimum values of.
Specifically, the objective function adopted in the embodiment of the present application is considered from two aspects, namely, the treatment effect, FaThe degree of deviation of each load voltage from its rated voltage is measured; on the other hand, the economic cost, FbThe action loss of each voltage regulating device is measured. For FaAnd FbIn order to realize balanced selection of the load voltage and the load voltage, a multi-target compromise model is formed through a lambda operator, ξ is used as an objective function value, then when ξ obtains a minimum value, the currently determined voltage regulating parameter is considered to be an optimal value after comprehensive consideration of treatment effect and economic consumption, namely the sum of the degree of deviation of each load voltage from the rated voltage and the action loss of each voltage regulating device is minimum.
The rural power grid low-voltage treatment system provided by the embodiment of the application is introduced below.
Referring to fig. 3, fig. 3 is a block diagram of a rural power grid low-voltage treatment system provided in the present application; comprises a voltage monitor 1, a DAVC2 and a voltage regulating device 3;
the voltage monitor 1 is used for monitoring the load voltage of each load node; and sent to DAVC 2;
the DAVC2 is used for acquiring the load voltage of the load node; judging whether the load voltage is lower than a preset threshold value or not; when the load voltage is lower than a preset threshold value, determining a voltage regulating parameter of the voltage regulating device 3 according to the load voltage; sending the voltage regulating parameters to the voltage regulating device 3;
the voltage regulating device 3 is used for regulating the load voltage according to the voltage regulating parameters; the voltage regulating device 3 comprises a feeder reactive compensation device, and the voltage regulating parameter of the feeder reactive compensation device is the feeder reactive compensation quantity.
Therefore, in the rural power grid low-voltage treatment system provided by the application, the DAVC2 can be adjusted by controlling the voltage regulation parameters of the voltage regulation device 3 when the low-voltage condition occurs by analyzing the load voltage of the load node collected by the voltage monitor 1. Because the voltage regulating device 3 adopted in the application comprises the feeder reactive compensation device installed on the feeder line, the low voltage problem of the load node can be effectively solved by utilizing the advantage that the voltage regulating device is close to the load node.
The utility model provides a rural power grids low voltage treatment system, on the basis of above-mentioned embodiment:
as a preferred embodiment, further comprising AVC;
and the AVC is used for receiving and regulating the switching number of the transformers of the regional transformer substation according to the load voltage sent by the DAVC 2.
The specific implementation of the rural power grid low-voltage treatment system provided by the application and the rural power grid low-voltage treatment method described above can be referred to correspondingly, and details are not repeated here.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The technical solutions provided by the present 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.
Claims (8)
1. A rural power grid low-voltage treatment method is characterized by comprising the following steps:
acquiring a load voltage of a load node;
judging whether the load voltage is lower than a preset threshold value or not;
if so, determining the voltage regulating parameters of the voltage regulating device according to the load voltage by adopting a tabu search algorithm;
sending the voltage regulating parameter to the voltage regulating device so that the voltage regulating device can regulate the load voltage according to the voltage regulating parameter;
the voltage regulating device comprises a feeder reactive compensation device, and the voltage regulating parameter of the feeder reactive compensation device is a feeder reactive compensation quantity;
the target function of the tabu search algorithm is as follows:
ξ＝min{max[λ(Fa)+λ(Fb)]}；
wherein ξ is the objective function value;
Uithe load voltage of the ith load node; u shapeiNThe rated voltage of the ith load node; u shapeimaxIs UiMaximum value of (d); u shapeiminIs UiMinimum value of (d); n is the total number of the load nodes; s is an adjustment coefficient; liThe number of times of actions of the voltage regulating device of the ith load node; f is any argument of the function λ ();
the constraint conditions of the tabu search algorithm are as follows:
wherein, PGiIs the active power output of the generator; pLiIs the active consumption of the load node; u shapejThe load voltage of the jth load node; gijIs the conductance; b isijIs susceptance; thetaijIs the voltage phase angle; qGiIs the reactive power output of the generator; qLiIs the reactive power consumption of the load node; qCiThe reactive compensation quantity of the load node i; qGmaxAnd QGminAre respectively QGiMaximum and minimum values of; qCmaxAnd QCminAre respectively QCiMaximum and minimum values of.
2. The rural power grid low-voltage treatment method according to claim 1, wherein the voltage regulating device further comprises a bus reactive power compensation device and a distribution transformer;
the voltage regulating parameter of the bus reactive power compensation device is a bus reactive power compensation quantity; and the voltage regulating parameter of the distribution transformer is transformer transformation ratio.
3. The rural power grid low-voltage treatment method according to claim 2, wherein the distribution transformer is an on-load tap changer.
4. The rural power grid low-voltage treatment method according to claim 1, further comprising:
and a filtering device is arranged between the compensation point of the feeder reactive compensation device and a load so as to improve the quality of electric energy.
5. The rural power grid low-voltage treatment method according to claim 1, further comprising:
sending the load voltage to automatic power grid voltage control equipment; and the automatic power grid voltage control equipment can adjust the switching number of the transformers of the transformer substation in the area according to the load voltage.
6. The rural power grid low-voltage treatment method according to any one of claims 1 to 5, wherein the step of determining the voltage regulating parameters of the voltage regulating device according to the load voltage by adopting a tabu search algorithm comprises the following steps:
determining the objective function of low-voltage governance, the current value of the voltage-regulating parameter, the satisfied constraint condition and the taboo length;
determining fitness according to the objective function;
performing neighborhood movement on the current value to generate a neighborhood movement set of the current value, wherein the neighborhood movement set meets the constraint condition; the neighborhood moving set does not comprise a tabu object of which the iteration number is less than the tabu length;
determining a median value with optimal fitness in the neighborhood mobile set;
judging whether the fitness of the intermediate value is better than the current value;
if yes, determining the intermediate value as an updated current value, a target value and a taboo object;
if not, determining the intermediate value as the updated current value;
judging whether an iteration termination condition is met;
if yes, determining the target value as a finally output pressure regulating parameter of the pressure regulating device;
if not, continuing to execute the subsequent step of carrying out variable change on the current value and generating a neighborhood moving set of the current value meeting the constraint condition.
7. A rural power grid low voltage treatment system, characterized in that includes:
voltage monitor: the load voltage monitoring device is used for monitoring the load voltage of each load node; and sending the voltage to regional distribution network reactive voltage optimization operation control equipment;
the regional distribution network reactive voltage optimization operation control equipment comprises: the load voltage of the load node is obtained; judging whether the load voltage is lower than a preset threshold value or not; when the load voltage is lower than the preset threshold, determining a voltage regulating parameter of a voltage regulating device according to the load voltage by adopting a tabu search algorithm; sending the voltage regulating parameters to the voltage regulating device;
the pressure regulating device is characterized in that: the load voltage is adjusted according to the voltage adjusting parameter; the voltage regulating device comprises a feeder reactive compensation device, and the voltage regulating parameter of the feeder reactive compensation device is a feeder reactive compensation quantity;
the target function of the tabu search algorithm is as follows:
ξ＝min{max[λ(Fa)+λ(Fb)]}；
wherein ξ is the objective function value;
Uithe load voltage of the ith load node; u shapeiNThe rated voltage of the ith load node; u shapeimaxIs UiMaximum value of (d); u shapeiminIs UiMinimum value of (d); n is the total number of the load nodes; s is an adjustment coefficient; liThe number of times of actions of the voltage regulating device of the ith load node; f is any argument of the function λ ();
the constraint conditions of the tabu search algorithm are as follows:
wherein, PGiIs the active power output of the generator; pLiIs the active consumption of the load node; u shapejThe load voltage of the jth load node; gijIs the conductance; b isijIs susceptance; thetaijIs the voltage phase angle; qGiIs the reactive power output of the generator; qLiIs the reactive power consumption of the load node; qCiThe reactive compensation quantity of the load node i; qGmaxAnd QGminAre respectively QGiMaximum and minimum values of; qCmaxAnd QCminAre respectively QCiMaximum and minimum values of.
8. The rural power grid low voltage treatment system of claim 7, further comprising:
automatic control equipment of the grid voltage: and the system is used for receiving and regulating the switching quantity of the transformers of the regional transformer substation according to the load voltage sent by the regional distribution network reactive voltage optimization operation control equipment.
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| CN111600319B (en) * | 2020-03-05 | 2023-04-18 | 青岛鼎信通讯股份有限公司 | Power electronic type distributed three-phase imbalance treatment method |
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