CN109347116B - Method for centralized monitoring of reactive voltage state of whole network by adopting automatic voltage control system - Google Patents
Method for centralized monitoring of reactive voltage state of whole network by adopting automatic voltage control system Download PDFInfo
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- CN109347116B CN109347116B CN201811290056.XA CN201811290056A CN109347116B CN 109347116 B CN109347116 B CN 109347116B CN 201811290056 A CN201811290056 A CN 201811290056A CN 109347116 B CN109347116 B CN 109347116B
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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
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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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- 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
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Abstract
A method for centralized monitoring of the reactive voltage state of the whole network by adopting an automatic voltage control system belongs to the field of power network dispatching management and control. The method includes the steps of bringing alarm blocking signals of an AVC system and out-of-limit information found in operation into a closed loop processing system, analyzing centralized and outstanding problems, finding out abnormal reasons and solving methods, continuously improving abnormal processing flows and making detailed and complete processing flows. The method improves the operation efficiency of the AVC system, further improves the reactive control level of voltage, ensures the safe and stable operation of the power grid, ensures the qualification of the voltage and power factor of related nodes, reduces the reactive transmission of lines to the greatest extent, and reduces the active loss of the power grid caused by unnecessary reactive power flow. The method can be widely applied to the field of power grid dispatching management and control.
Description
Technical Field
The invention belongs to the field of power grid dispatching management and control, and particularly relates to a method for carrying out centralized monitoring on the reactive voltage state of a whole power grid by adopting an automatic voltage control system.
Background
An Automatic Voltage Control (AVC) system of a power grid realizes the optimization Control of Voltage and reactive compensation equipment by carrying out online analysis and calculation on data such as telemetering and remote signaling of each node in a power system, so that the Control quantities such as Voltage qualification rate, reactive power transmission, power factors and the like meet boundary conditions, the running condition of the power system is improved, the line loss is reduced, and the stability and the economy of the power system are improved.
The automatic voltage control system (AVC) of the power grid has the main functions of ensuring that the voltage and the power factor of the gateway are qualified on the premise of ensuring the safe and stable operation of the power grid, reducing the reactive power transmission of the line as much as possible and reducing the active loss of the power grid caused by unnecessary reactive power flow.
The automatic voltage control system carries out centralized monitoring and analysis calculation on the whole network reactive voltage state, carries out coordination optimization control on the wide-area scattered power grid reactive devices from the global perspective, and is an important technical means for keeping the system voltage stable, improving the power grid voltage quality and the whole system economic operation level and improving the reactive voltage management level.
The regional power grid AVC system is an expansion of a main station automation advanced application software technology to a closed-loop control direction. By a complete high-speed power data communication network and by utilizing the SCADA application function of the master station system, real-time information including bus voltage, generator output, line tide, switch disconnecting link and the like can be acquired in a control center, and remote control remote adjustment operations such as generator reactive output adjustment, capacitor reactor switching, transformer tap lifting and the like can be remotely completed in the control center.
The AVC adjusting means is to adjust the on-load tap changer and the capacitor switch to make the voltage and the reactive power meet the conditions. By monitoring the measurements of each node in the system, recommendations or controls are made to the system. The general principle is that voltage is preferred, and reactive power is considered during voltage regulation, so that the system voltage is in a constant value range, power factors are controlled to be qualified, and reactive power of each station is balanced locally. The AVC control strategy comprises a region voltage strategy, a bus voltage strategy, a region reactive power strategy and a single station reactive power strategy, and the control flow is shown in figure 1.
In the online debugging process of AVC of a regional power grid to which the applicant belongs, the following common problems are found:
firstly, AVC frequent locking: to protect the operating device and prevent damage to the controlled device from incorrect control commands, AVC can latch the device and automatically trigger generation of an AVC alert signal.
In actual operation, there are generally two situations of AVC abnormal alarm lockout: the number of times of on-load switch/capacitor switch actions is out of limit; the reasons for the two times of refusing actions of the on-load switch/capacitor switch to cause the times of exceeding the limit or the two times of refusing actions are various, and specific analysis is required according to different conditions.
Secondly, operating data are out of limit for multiple times under normal working conditions: the reason for the out-of-limit of the operation data is mainly two, namely that the operation condition exceeds the adjusting capacity of the control system, and the control strategy does not adapt to the specific operation condition.
How to solve the above problems is a problem to be solved urgently in practical work.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for carrying out centralized monitoring on the reactive voltage state of the whole network by adopting an automatic voltage control system. The alarm blocking signal of the AVC system and the out-of-limit information found in the operation are brought into a closed loop processing system, the centralized and outstanding problems are analyzed, the abnormal reason and the solution are found, the abnormal processing flow is continuously improved, and the detailed and complete processing flow is worked out.
The technical scheme of the invention is as follows: the method for monitoring the reactive voltage state of the whole network in a centralized manner by adopting an automatic voltage control system is characterized by comprising the following steps:
firstly, strengthening centralized monitoring and making abnormal records:
the method is characterized in that problems occurring in the operation of the AVC system are monitored and recorded in an enhanced manner, and each value dispatcher is required to make corresponding records on station, time, locking information, processing mode and closed-loop condition of alarm locking of the AVC system in a time-recovery and recording manner;
the out-of-limit information found in operation is processed in time and is recorded correspondingly, and each value dispatcher must list the AVC operation condition of the day into the duty-switching content when switching the duty and bring the processed problem into closed-loop processing in time;
and secondly, perfecting a processing flow and analyzing abnormal reasons:
specifying a specific processing flow for different possible abnormal conditions, and specifying a program for circulation for problems which cannot be processed on the same day; the dispatching management center compiles an AVC operation monthly report every month, analyzes the centralized and prominent problems, finds out the abnormal reasons and the solution method, and continuously improves the abnormal processing flow;
thirdly, developing the interpersonal coordination and solving the practical problems:
the method relates to the problem of non-scheduling speciality, and the method comprises the following steps of holding a coordinated conference among all departments of a power supply company, organizing the joint investigation of departments of automation, power transformation, marketing and the like, and finding out the specific reasons of the occurrence of defects; and performs closed-loop management according to a defect management flow.
Furthermore, the evaluation, early warning and decision method works out a detailed and complete processing flow for various types of AVC defects.
Specifically, the evaluation, early warning and decision method strictly executes a defect elimination processing flow, and judges and records the properties of the defects at the first time of defect discovery; dispatching an operator on duty and an automation professional to confirm the on-site primary equipment and the on-site secondary equipment in time; and analyzing the multiple problems which appear in a centralized way in time to find out the exact reason.
Specifically, the assessment, early warning and decision method tracks and processes the defects which cannot be eliminated temporarily, carries out interpersonal coordination and factory joint attack and customs, strengthens monitoring on the defective stations, carries out manual adjustment and intervention in time, ensures that the operation data of the power grid does not exceed the limit value, and improves the safety and the economy of the operation of the power grid.
Specifically, the evaluation, early warning and decision method makes an AVC operation monthly report through a scheduling center, summarizes AVC and system operation data of each month, and searches for undiscovered problems; analyzing the defects through long-term operation data; recording the defect of the unclosed loop, and strengthening tracking; and (4) aiming at the problems existing in the previous stage, arranging the working key points of the next stage.
Compared with the prior art, the invention has the advantages that:
1. by adopting the technical scheme, the on-load voltage regulation devices and the reactive compensation equipment of each transformer substation in the power grid are subjected to centralized monitoring, unified management and online detection, so that the voltage control level of a power grid dispatching or regulating operator can be greatly improved, the labor intensity of repeated voltage regulation is reduced, and the reactive and voltage management efficiency is improved.
2. By adopting the technical scheme, the operation efficiency of the AVC system is improved, the voltage reactive control level is further improved, the safe and stable operation of the power grid is ensured, the qualification of the voltage and the power factor of the related node is ensured, the reactive transmission of the line is reduced to the greatest extent, and the active loss of the power grid caused by unnecessary reactive power flow is reduced.
3. By adopting the technical scheme, the AVC application level of the regulation and control center is qualitatively improved, and the power supply voltage qualification rate and the reactive power control level reach new heights.
Drawings
FIG. 1 is a schematic diagram of a prior art AVC control flow diagram;
FIG. 2 is a schematic view of the AVC defect processing flow of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The technical scheme of the invention provides a method for carrying out centralized monitoring on the reactive voltage state of the whole network by adopting an automatic voltage control system, which is characterized by comprising the following steps:
firstly, strengthening centralized monitoring and making abnormal record
The method has the advantages that the problems occurring in the operation of the AVC system are monitored and recorded in an enhanced manner, and each value dispatcher is required to make corresponding records on the station, the time, the locking information, the processing mode and the closed-loop condition of the alarm locking signal and the time recovery of the AVC system. And timely processing the out-of-limit information found in operation and making corresponding records. When each value dispatcher switches over, the AVC operation condition of the day is listed as the switching content, and the closed loop is carried out on the processed problem in time.
Secondly, perfecting the processing flow and analyzing the abnormal reason
Specific processing flows are specified for different possible abnormal conditions, and circulation programs are specified for problems which cannot be processed on the same day. The center compiles an AVC operation monthly report every month, analyzes centralized and outstanding problems, finds out abnormal reasons and solutions, and continuously improves abnormal processing flows.
Thirdly, developing the interpersonal coordination and solving the practical problems
The method relates to the problem of unscheduled specialties, holds a department to coordinate a meeting, organizes the joint investigation of departments such as automation, power transformation, marketing and the like, and finds out the specific reasons of the defects; and performs closed-loop management according to a defect management flow.
The innovation point and the obtained breakthrough of the technical scheme of the invention are as follows:
the defect management process is perfected:
a control center sets a detailed and complete processing flow aiming at various types of AVC defects which are found, as shown in figure 2, the content and the working principle of the AVC defect are all obvious to those skilled in the art due to the common format and the expression method in the industry, and therefore, the details are not described herein.
Strictly executing a defect elimination processing flow, and judging and recording the properties of the defects at the first time of defect discovery; dispatching an operator on duty and an automation professional to confirm the on-site primary equipment and the on-site secondary equipment in time; and analyzing the multiple problems which appear in a centralized way in time to find out the exact reason.
And tracking the defect which cannot be eliminated temporarily, carrying out interpersonal coordination and factory joint attack and customs, strengthening and monitoring the defective plant station, and carrying out manual adjustment intervention in time if necessary, so as to ensure that the operation data of the power grid does not exceed the limit value, and improve the safety and the economy of the operation of the power grid.
Making an AVC operation monthly report, summarizing AVC and system operation data of each month, and searching for undiscovered problems; analyzing the defects through long-term operation data; recording the defect of the unclosed loop, and strengthening tracking; and (4) aiming at the problems existing in the previous stage, arranging the working key points of the next stage.
And for the situations of out-of-limit times, abnormal locking and the like in the AVC operation process, the real reasons of the AVC defects are determined by analyzing and comparing operation data curves of bus voltage, main transformer reactive power, on-load voltage regulation gears and the like.
The reasons for the AVC defect are roughly the following four points: 1. primary equipment failure; 2. a secondary equipment failure; 3. telemetry failure is remotely signaled; 4. AVC control strategy is not applicable. The optimization of the AVC control strategy according to the system-related operation data curve is a difficult point of AVC deletion processing, and table 1 shows an AVC-related control mode.
TABLE 1 AVC control mode
The original control strategy is a power factor calculation method, a reactive power control limit value is calculated through the power factor limit value and the current active power, and under certain conditions, a main transformer voltage regulating switch can act before a capacitor switch, so that reactive power compensation is insufficient or overcompensation is caused; and the frequent action of the main transformer voltage regulating switch causes the blocking.
Under the condition, a fixed reactive limit method is selected to be adopted, so that the capacitor can be thrown into the capacitor preferentially under the condition of insufficient or excessive reactive power, and the operation parameters are restored to the normal range.
By implementing the technical scheme of the invention, the abnormal operation failure of the AVC system is greatly reduced, the operation efficiency of the AVC system is improved, the reactive control level of voltage is further improved, the safe and stable operation of the power grid is ensured, the qualification of the voltage and power factor of related nodes is ensured, the reactive transmission of lines is reduced to the greatest extent, and the active loss of the power grid caused by unnecessary reactive power flow is reduced.
In addition, centralized monitoring, unified management and online detection are carried out on the on-load voltage regulation devices and the reactive compensation equipment of each transformer substation in the power grid, the voltage control level of regulators can be greatly improved, the labor intensity of repeated voltage regulation is reduced, and the reactive and voltage management efficiency is improved.
The invention can be widely applied to the field of power grid dispatching management and control.
Claims (5)
1. A method for centralized monitoring of reactive voltage status of a whole network using an automatic voltage control system, the method comprising:
firstly, strengthening centralized monitoring and making abnormal records:
the method has the advantages that problems occurring in the operation of the AVC system are monitored and recorded in an enhanced manner, and each value dispatcher is required to recover and record station, time, locking information, processing mode and closed-loop condition of alarm locking of the AVC system;
the out-of-limit information found in operation is processed in time and is recorded correspondingly, and each value dispatcher must list the AVC operation condition of the day into the duty-switching content when switching the duty and bring the processed problem into closed-loop processing in time;
and secondly, perfecting a processing flow and analyzing abnormal reasons:
specifying a specific processing flow for different possible abnormal conditions, and specifying a program for circulation for problems which cannot be processed on the same day; the dispatching management center compiles an AVC operation monthly report every month, analyzes the centralized and prominent problems, finds out the abnormal reasons and the solution method, and continuously improves the abnormal processing flow;
thirdly, developing the interpersonal coordination and solving the practical problems:
the problem of non-scheduling speciality is involved, a coordinated conference of all departments of a power supply company is held, and joint investigation of automation, power transformation and marketing departments is organized to find out specific reasons of defects; and performing closed-loop management according to the defect management flow;
the centralized monitoring method comprises the steps of bringing an alarm blocking signal of an AVC system and out-of-limit information found in operation into a closed loop processing system, analyzing centralized and outstanding problems, finding out abnormal reasons and solving methods, continuously improving abnormal processing flows and making detailed and complete processing flows;
the centralized monitoring method carries out centralized monitoring, unified management and online detection on the on-load voltage regulation devices and the reactive compensation equipment of each transformer substation in the power grid, can greatly improve the voltage control level of a power grid dispatching or regulating operator, lightens the labor intensity of repeated voltage regulation, and improves the reactive power and voltage management efficiency.
2. The method for centralized monitoring of reactive voltage status in a network using an automatic voltage control system as claimed in claim 1, wherein said centralized monitoring method comprises a detailed and complete process flow for all types of AVC defects that have been discovered.
3. The method for centralized monitoring of reactive voltage status of the whole network using automatic voltage control system as claimed in claim 2, wherein the centralized monitoring method strictly performs the defect elimination process, and determines and records the nature of the defect at the first time of defect discovery; dispatching an operator on duty and an automation professional to confirm the on-site primary equipment and the on-site secondary equipment in time; and analyzing the multiple problems which appear in a centralized way in time to find out the exact reason.
4. The method for centralized monitoring of reactive voltage state of whole network by using automatic voltage control system according to claim 2 is characterized by that said centralized monitoring method can be used for tracking the defect which can not be eliminated temporarily, developing the interoperable coordination and factory joint attack and closing in time, and making intensive monitoring on the defective factory station, and making manual regulation and intervention in time, and can ensure that the operation data of power network does not exceed the limit value so as to raise the safety and economy of power network operation.
5. The method for centralized monitoring of reactive voltage status of the whole network using automatic voltage control system as claimed in claim 2, wherein the centralized monitoring method is characterized in that the scheduling center makes an AVC operation month report, summarizes the AVC and system operation data each month, and finds out the undiscovered problems; analyzing the defects through long-term operation data; recording the defect of the unclosed loop, and strengthening tracking; and (4) aiming at the problems existing in the previous stage, arranging the working key points of the next stage.
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