CN112003287A - Method for improving operation efficiency of on-site automatic voltage regulation equipment of central urban power grid - Google Patents

Method for improving operation efficiency of on-site automatic voltage regulation equipment of central urban power grid Download PDF

Info

Publication number
CN112003287A
CN112003287A CN202010667965.1A CN202010667965A CN112003287A CN 112003287 A CN112003287 A CN 112003287A CN 202010667965 A CN202010667965 A CN 202010667965A CN 112003287 A CN112003287 A CN 112003287A
Authority
CN
China
Prior art keywords
voltage
capacitor
equipment
strategy
reactive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010667965.1A
Other languages
Chinese (zh)
Inventor
徐杰
孙辰
沈主浮
杨振睿
王斌
蔡斌
杨波
钟鸣
郭峰
何正宇
唐海强
周易
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Shanghai Electric Power Co Ltd
Original Assignee
State Grid Shanghai Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Shanghai Electric Power Co Ltd filed Critical State Grid Shanghai Electric Power Co Ltd
Priority to CN202010667965.1A priority Critical patent/CN112003287A/en
Publication of CN112003287A publication Critical patent/CN112003287A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a method for improving the operation efficiency of on-site automatic voltage regulation equipment of a central urban power grid, which comprises a strategy S1, wherein the strategy comprises the steps of adjusting the action setting values of the mutual coordination and matching of the on-site voltage regulation equipment; strategy S2, carrying out uniform and accurate calculation on the reactive compensation capacity of the switching quantity of the capacitor; and the strategy S3 defines and provides a working efficiency index E for quantitatively evaluating and reflecting the operation condition of the field voltage regulating equipment connected to the voltage reactive power control system. The invention can perfect and optimize the strategies, logics and the like of voltage regulation and reactive compensation, solve the locking problem of the on-site automatic voltage regulation equipment, improve the operation efficiency, prolong the service life of the equipment and ensure the quality, safety and stability of the power grid voltage.

Description

Method for improving operation efficiency of on-site automatic voltage regulation equipment of central urban power grid
Technical Field
The invention relates to a method for improving the operation efficiency of a central urban power grid on-site automatic voltage regulating device in the field of power grid voltage reactive automatic control of a smart power grid.
Background
An Automatic Control system (AVC) for grid Voltage reactive power optimization is an important function of a dispatching automation system, and is characterized in that the parameters of various reactive power Control devices in the whole network are adjusted from the global angle of grid optimization operation by monitoring and acquiring the bus Voltage, bus reactive power, main variable height and low Voltage side reactive power measurement data of each transformer substation and power plant and real-time data of each switch state and the like in real time, centralized monitoring and analysis calculation are carried out on the parameters, under the constraint condition of meeting normal power balance of nodes and various safety indexes, the comprehensive optimization aims of minimum main transformer tap switch adjustment times, most reasonable capacitor switching capacity and action times, optimal generator reactive power output, highest Voltage qualified rate, minimum transmission network loss rate and the like are taken as targets, and a Control instruction is formed to realize the Automatic closed-loop Control of coordinated optimization on reactive power devices, and finally, the economic operation of the power grid is realized. The method is characterized in that various field voltage regulating devices are regulated through hierarchical control, so that full-network voltage optimization closed-loop control and reactive hierarchical partition balance are realized, the voltage quality is guaranteed to be qualified all the time, and sufficient system stability margin is provided. Due to the advancement of the technology and the functions, the AVC system is widely applied to power grids at home and abroad along with the continuous development of the smart power grid.
In a large-scale urban power grid, reactive power supply equipment such as a generator set, a static phase modulator, a static reactive compensator and the like is generally not included when the AVC system is accessed, and on-site voltage regulating equipment mainly refers to a transformer tap and a capacitor switchable reactive power compensation device arranged in a transformer substation. And the on-site voltage reactive power regulation equipment is automatically monitored through a communication network between the main station and each plant station and various telecontrol terminals, so that the voltage reactive power is optimally regulated. The aim is to ensure the comprehensive voltage qualification rate, reduce the network loss as much as possible, realize the local layered partition balance of the reactive power in the governed power grid and prevent the reactive power from generating shortage or reverse transmission.
Therefore, the closed-loop control of the grid voltage optimization and the reactive layered partition balance are realized, the voltage quality is guaranteed to be qualified, and the realization is finally carried out by means of various field automatic voltage regulating devices. The voltage regulation device combines the requirements of the central urban area of the super-huge city on the high voltage quality and reliability of power supply of the power grid, and simultaneously faces the practical situation characteristics of the central urban area power grid and equipment such as high load density, dense distribution network, high main transformer load rate, short supply of channel and site resources, high investment cost and the like, the adaptability of the original related voltage regulation and compensation action strategies of the voltage regulation equipment is gradually reduced, the operating efficiency of the voltage regulation equipment is reduced, and the voltage regulation control of the voltage reactive power of the power grid is not facilitated. Currently, for efficiency improvement of an AVC system in actual operation, optimization of voltage regulation strategy logic and adaptability of actual conditions of existing voltage regulation equipment, grid structure, power supply configuration and the like of a power grid are in lack of comprehensive consideration, and balance of saving space, investment, equipment overhaul and replacement cost, improving efficiency of the voltage regulation equipment and power grid voltage qualification rate is also in lack of comprehensive consideration in the aspect of automatic voltage regulation control of the power grid.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for improving the operation efficiency of the on-site automatic voltage regulating equipment of a central urban power grid.
One technical scheme for achieving the above purpose is as follows: a method for improving the operation efficiency of on-site automatic voltage regulation equipment of a central urban power grid comprises the following adjustment strategies:
the strategy S1 is used for adjusting the action setting value of mutual coordination and matching between the field pressure regulating devices, and specifically comprises the following steps:
strategy S11, adjusting the lower limit of the bus voltage for triggering the main transformer on-load action to 10.2 kilovolts, and adjusting the upper limit of the bus voltage for triggering the on-load action to 10.6 kilovolts, and keeping the values all unified in each station;
strategy S12, shortening the two-stage action exit time of the on-load voltage regulating relay, uniformly adjusting the two-stage action exit time to 20 seconds and 10 seconds, adjusting the voltage setting value of the action of the capacitor to 10.0-10.7 kilovolts, and adjusting the action time to 30 seconds;
strategy S2, the reactive compensation capacity of the capacitor switching amount is uniformly and accurately calculated, and the specific formula is Cs＝k·Crated；
In the formula, CsFor the converted capacitor capacity, CratedSetting a certain coefficient k of the maximum capacitor capacity of the substation for the real rated capacity of a capacitor (group) arranged on a certain bus of the substation, wherein k is the maximum inverse transmission or absorption reactive power coefficientFalling downDetermining the maximum allowable reverse reactive power of the station according to the coefficient; setting a certain coefficient k of the maximum capacitor capacity of the stationSuction deviceDetermining the maximum allowable reactive power absorption of the station according to the coefficient, wherein kFalling down＝0.1，kSuction device＝1.1；
Strategy S3, which is to quantitatively evaluate and reflect the operation of the field voltage regulating device connected to the reactive voltage control system, defines and provides a working efficiency index E, which has the following formula:
Ε＝|1-fc,t|∞＝|1-nL/T|∞
fc,tfor the blocking frequency, n, of capacitor and main transformer on-load two-class on-site voltage regulation equipment in an AVC systemLIs evaluated for a single deviceEstimating the sum of the number of times of latch-up in the period; t is an evaluation period, and the setting of an automatic unlocking period is considered, so that the voltage regulating equipment cannot be locked again in the same day after being locked, and T is the number of days of a natural day in each month; e is the locking frequency f of two types of field voltage regulation equipment, namely a capacitor and a main transformer in an evaluation period and an AVC systemc,tThe actual working efficiency of the field voltage regulating equipment of the voltage reactive control system after the voltage regulation and reactive compensation strategies are optimized is quantitatively evaluated and calculated according to the formula, and the higher the E value is, the better the working efficiency of the field voltage regulating equipment is.
Compared with the prior art, the method for improving the operation efficiency of the on-site automatic voltage regulating equipment of the central urban power grid has the following advantages that:
1. the invention is based on the existing field voltage regulating equipment and an AVC system, realizes the conformity with the actual situation of the power grid and the equipment and also adapts to the increasingly improved voltage quality requirement of the automatic voltage optimization control by the coordination and matching of the action setting value of the voltage regulating equipment and the unification and the accuracy of the reactive compensation switching quantity calculation method.
2. The invention adopts a strategy improvement and promotion mode to optimize and improve the voltage automatic control of the AVC system, does not need to increase the investment of one-time power transmission and transformation or the reconstruction and upgrade of bus auxiliary equipment facilities, and does not occupy the power transmission channel resources and the transformer substation space resources in a central urban area.
3. The invention has the advantages of taking account of economy and actual effect, prolonging the service life of the equipment so as to save the maintenance and replacement cost of the existing equipment, obviously improving the operating efficiency of the on-site voltage regulating equipment after implementation without repetition and obtaining higher comprehensive voltage qualification rate.
Drawings
FIG. 1 is a schematic view of an action setting value pull-off step difference of coordination matching between field pressure regulating devices;
FIG. 2 is a schematic diagram illustrating the preemptive disable operation of a capacitor during a voltage violation.
Detailed Description
In order to better understand the technical solution of the present invention, the following detailed description is made by specific examples:
referring to fig. 1, a schematic diagram of an action setting value pull-off step difference for coordination and matching between field pressure regulating devices according to the present invention is shown. The main transformers of 110/10 KV and 35/10 KV step-down transformer substations in a common central urban area are all on-load tap changing transformers. The effective coordination between the main transformer load and the capacitor is realized by pulling the step difference according to the setting value of the voltage regulating action, namely when the 10 kilovolt bus voltage of the transformer substation begins to enter an out-of-limit interval, the voltage regulating strategy ensures that the field voltage regulating equipment respectively acts sequentially and orderly, and finally the bus voltage returns to the normal range as soon as possible. Because the switching action times of the capacitor in a fixed period are limited, when the voltage is out of limit, the main transformer load generally acts preferentially to complete voltage regulation, and the capacitor acts only under the condition that the main transformer load cannot obtain the voltage regulation effect or reactive power shortage and reverse transmission occur. However, for some transformer substations, the accuracy of a main transformer on-load relay is lower than that of a capacitor, the action exit time is longer than that of the capacitor, the capacitor controlled by AVC is more sensitive, when the bus voltage is out of limit, the bus voltage is lower than the lower voltage limit of the action of a voltage regulating device by 10.1kV, and an AVC system can switch the capacitor to regulate the voltage in advance of the main transformer on-load according to a voltage priority principle. However, the capacitor is cut or put into the device due to reactive unbalance, and finally the device is locked due to the fact that the number of times of the capacitor operation is out of limit after repeated for many times, the bus voltage cannot be adjusted, and the process is shown in fig. 2. Aiming at the condition that the load of the main transformer and the capacitor cannot be effectively coordinated and matched, adjustment and optimization in the aspect of action setting value are carried out to pull the step difference. In order to ensure that the action coordination between the voltage regulating devices is more optimal and the action coordination process of the whole voltage regulating device is more scientific and reasonable, avoid AVC locking and capacitor device damage caused by frequent actions of a capacitor switch due to 'rush running' of an AVC system on an on-load tap, draw the level difference on the voltage limit setting of the voltage regulating devices as much as possible and ensure that the main transformer on-load acts before the capacitor when the bus voltage exceeds the limit.
Therefore, in order to avoid the inefficient frequent operation of the capacitor in the above case, it is necessary to perform the operation setting value adjustment in accordance with the mutual coordination between the field voltage regulating devices by means of the strategy S1. The method comprises the following steps: strategy S11, adjusting the lower limit of the bus voltage for triggering the main transformer on-load action to 10.2 kilovolts, and adjusting the upper limit of the bus voltage for triggering the on-load action to 10.6 kilovolts, and keeping the values all unified in each station; and strategy S12, the two-stage action exit time of the on-load voltage regulating relay is shortened and uniformly regulated to 20 seconds and 10 seconds, the voltage setting value of the action of the regulating capacitor is 10.0-10.7 kilovolts, and the action time is 30 seconds.
After the action setting value grade difference of the voltage regulating equipment is pulled open, the capacitor switching is carried out only under the conditions that the voltage still deviates from the normal range after the main transformer has loaded action, the voltage regulating task cannot be finished or the reactive power exceeds the allowable unbalance range, the action is effective, and the situation that the voltage regulating equipment is repeatedly put into and cut off is avoided.
After the setting value of the main transformer on-load voltage regulation is adjusted, the main transformer on-load voltage regulation can be well matched with a capacitor controlled by an AVC system, and the condition that the AVC system adjusts the bus voltage by switching a 10 kilovolt capacitor does not occur. A 35 kv substation is taken as an example for explanation. According to the AVC system statistics, the total station capacitor action of the station is 150 times in total during 2017.3.24-4.24. And when the voltage regulating action setting value is adopted to modify the pull-open stage difference, the action of the capacitor of the station is totally 4 times in the period of 2018.3.24-4.24, and the equivalent reduction amplitude reaches 97.33%. Therefore, obvious effects are achieved in the aspects of considering voltage regulation effect, reducing the locking times of equipment, improving AVC efficiency, reducing unnecessary wear of a capacitor, prolonging the service life of the equipment and the like.
For a capacitance capacity reduction algorithm of a reactive compensation capacity calculation mode, a certain coefficient k of the maximum capacitor capacity of the station is setFalling downDetermining the maximum allowable reverse reactive power of the station according to the coefficient; setting a certain coefficient k of the maximum capacitor capacity of the stationSuction deviceAnd determining the maximum allowable reactive power absorption of the station according to the coefficient. When the reactive power of the system reaches the converted capacity, the AVC system can switch the capacitor. In this mode, the AVC system needs to have the exact rated capacity of the field capacitor, otherwise it may cause capacitor switch malfunction. In combination with the actual power grid, a strategy of uniformly adopting a reactive power regulation mode of a capacitor capacity reduction algorithm for the capacitor AVC controlled substation is adopted,and modifying the new coefficient of the capacitor capacity reduction algorithm, and setting a certain coefficient k of the maximum capacitor capacity of the stationFalling downDetermining the maximum allowable reverse reactive power of the station according to the coefficient; setting a certain coefficient k of the maximum capacitor capacity of the stationSuction deviceDetermining the maximum allowable reactive power absorption of the station according to the coefficient, wherein kFalling down＝0.1，kSuction device1.1, with Cs＝k·CratedIn the formula, CsFor the converted capacitor capacity, CratedThe real rated capacity of a capacitor (group) arranged on a certain bus of a certain transformer substation. The coefficients are calculated according to a formula, the switching of the capacitor is only dependent on the shortage of reactive power on the 10 kilovolt bus or the interval of the back-feeding amount, and more voltage is preferentially given to a main transformer to be loaded for regulation. The following is described in connection with examples.
(1) Sending the maximum back reactive coefficient kFalling downModified from 0.5 to 0.1
The capacity of a No. 110 KV capacitor at a certain station is 1.2Mvar, and when the maximum reverse transmission reactive coefficient k is obtained according to a conversion capacity formulaFalling downWhen 0.5 is taken out, the reverse transmission of-0.6 Mvar occurs in a 10 kilovolt section bus, and the AVC system can cut off the capacitor; when the maximum reverse transmitting reactive coefficient kFalling downWhen 0.1 is taken, the reverse feeding of-0.12 Mvar occurs in a 10 kilovolt section of bus, and the AVC system will cut off the capacitor.
(2) Maximum absorption reactive coefficient kSuction deviceModified from 0.9 to 1.1
The capacity of a No. 110 KV capacitor at a certain station is 1.2Mvar, and according to a conversion capacity formula, when the maximum absorption reactive coefficient kSuction deviceWhen 0.9 is taken, a reactive notch of 1.08Mvar appears in a 10 kilovolt section bus, and an AVC system can be used for compensating the capacitor; when maximum absorption coefficient of reactive kSuction deviceWhen 1.1 is taken, a reactive gap of 1.32Mvar appears in a 10 kilovolt section bus, and the AVC system can be used for compensating the capacitor.
The final obtained effect is: the reactive power reverse feeding phenomenon and the capacity are greatly reduced, the reactive power (over-compensation) is not fed back after the capacitor is put into the capacitor, and the reactive power realizes the in-situ compensation. The method avoids the situation of reactive power reverse transmission to the maximum extent, and the accurate capacitance capacity switching calculated value enables the reactive power to be balanced locally, thereby being beneficial to obtaining good voltage reactive power regulation effect in various operation scenes, optimizing the operation of an AVC system and improving the working efficiency of the voltage regulation equipment.
In addition, the invention defines and provides a working efficiency index E for quantitatively evaluating and reflecting the operation condition of the field voltage regulating equipment connected into the voltage reactive power control system, and the working efficiency index E has the following formula:
Ε＝|1-fc,t|∞＝|1-nL/T|∞
fc,tfor the blocking frequency, n, of capacitor and main transformer on-load two-class on-site voltage regulation equipment in an AVC systemLSumming the number of latch-ups occurring for a single device during an evaluation period; t is an evaluation period, and the setting of an automatic unlocking period is considered, so that the voltage regulating equipment cannot be locked again in the same day after being locked, and T is the number of days of a natural day in each month; e is the locking frequency f of two types of field voltage regulation equipment, namely a capacitor and a main transformer in an evaluation period and an AVC systemc,tThe actual working efficiency of the field voltage regulating equipment of the voltage reactive control system after the voltage regulation and reactive compensation strategies are optimized is quantitatively evaluated and calculated according to the formula, and the higher the E value is, the better the working efficiency of the field voltage regulating equipment is.
And according to the defined formula, carrying out quantitative evaluation calculation on the actual working efficiency of the field voltage regulating equipment of the voltage reactive power control system after the voltage regulation and reactive power compensation strategies are optimized. Because the AVC voltage reactive power control system has been widely applied in urban power grids, 2017, in which the work efficiency tends to be stable, is a comparison reference. And (3) recording operation and maintenance data within two years after the optimization strategy measures are intensively implemented, and obtaining the monthly working efficiency condition of the AVC system through statistical accounting, wherein the monthly working efficiency condition is shown in the following table 1.
TABLE 1 comparison of work efficiency of on-site pressure regulating devices before and after optimization and improvement
Figure BDA0002581137550000071
The method is proved to be effective and reasonable by the examples, and the operation efficiency of the on-site automatic voltage regulating equipment of the central urban power grid can be obviously improved.
According to the method for improving the operation efficiency of the on-site automatic voltage regulating equipment of the central urban area power grid, the working efficiency of the on-site voltage regulating equipment is improved through the perfect optimization of the voltage regulation of the voltage regulating equipment and the reactive power compensation strategy mechanism under the conditions of not increasing the investment of the power grid equipment and saving the maintenance cost of equipment maintenance, and a good voltage reactive power optimization control effect which is suitable for different operation scenes and meets the actual characteristics and requirements of the central urban area power grid of a large city is obtained. The invention adopts a strategy of coordinating and matching two types of field voltage regulating equipment of a main transformer on-load and a capacitor when executing a voltage regulating task, and by obviously pulling off the setting grade difference of the voltage limit values of the main transformer on-load and the capacitor, the lower limit of the action voltage is increased and the upper limit of the action voltage is decreased, and the action time of an outlet is shortened, so that when the voltage of a 10 KV bus of a transformer substation exceeds the limit, the on-load voltage regulating tap of the main transformer is preferentially operated, and the capacitor is switched only when the voltage regulation cannot be completed or the excessive unbalance occurs in a reactive power mode. The invention adjusts and sets the coefficient of the capacitor capacity reduction algorithm, i.e. the maximum allowable reverse transmission reactive coefficient k of the substation busFalling downSet to 0.1, maximum allowable absorption reactive coefficient kSuction deviceThe voltage regulation strategy is set to be 1.1, reactive power reverse transmission and ineffective switching actions of capacitor equipment are avoided to the maximum extent, and meanwhile, voltage variation is judged in advance according to the switching capacity of the capacitor, so that more accurate and complete voltage regulation decisions and instructions can be formed in the voltage regulation strategy. The invention provides a method for calculating the working efficiency of field pressure regulating equipment, which is characterized in that vectors formed by the occurrence frequency of blocking in reasonable analysis periods are counted in an infinite norm mode to obtain the working efficiency reflecting the whole operation condition based on all field pressure regulating equipment samples arranged in governed substations, and visual and exact values of the working efficiency of the field pressure regulating equipment obtained based on the actual operation condition record of a power grid AVC system in each analysis period can be given.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims (1)

1. A method for improving the operation efficiency of on-site automatic voltage regulation equipment of a central urban power grid is characterized by comprising the following adjustment strategies:
the strategy S1 is used for adjusting the action setting value of mutual coordination and matching between the field pressure regulating devices, and specifically comprises the following steps:
strategy S11, adjusting the lower limit of the bus voltage for triggering the main transformer on-load action to 10.2 kilovolts, and adjusting the upper limit of the bus voltage for triggering the on-load action to 10.6 kilovolts, and keeping the values all unified in each station;
strategy S12, shortening the two-stage action exit time of the on-load voltage regulating relay, uniformly adjusting the two-stage action exit time to 20 seconds and 10 seconds, adjusting the voltage setting value of the action of the capacitor to 10.0-10.7 kilovolts, and adjusting the action time to 30 seconds;
strategy S2, the reactive compensation capacity of the capacitor switching amount is uniformly and accurately calculated, and the specific formula is Cs＝k·Crated；
In the formula, CsFor the converted capacitor capacity, CratedSetting a certain coefficient k of the maximum capacitor capacity of the substation for the real rated capacity of a capacitor (group) arranged on a certain bus of the substation, wherein k is the maximum inverse transmission or absorption reactive power coefficientFalling downDetermining the maximum allowable reverse reactive power of the station according to the coefficient; setting a certain coefficient k of the maximum capacitor capacity of the stationSuction deviceDetermining the maximum allowable reactive power absorption of the station according to the coefficient, wherein kFalling down＝0.1，kSuction device＝1.1；
Strategy S3, which is to quantitatively evaluate and reflect the operation of the field voltage regulating device connected to the reactive voltage control system, defines and provides a working efficiency index E, which has the following formula:
Ε＝|1-fc,t|∞＝|1-nL/T|∞
fc,tfor electricity in AVC systemLocking frequency n of two kinds of on-site voltage regulating equipment of container and main transformerLSumming the number of latch-ups occurring for a single device during an evaluation period; t is an evaluation period, and the setting of an automatic unlocking period is considered, so that the voltage regulating equipment cannot be locked again in the same day after being locked, and T is the number of days of a natural day in each month; e is the locking frequency f of two types of field voltage regulation equipment, namely a capacitor and a main transformer in an evaluation period and an AVC systemc,tThe actual working efficiency of the field voltage regulating equipment of the voltage reactive control system after the voltage regulation and reactive compensation strategies are optimized is quantitatively evaluated and calculated according to the formula, and the higher the E value is, the better the working efficiency of the field voltage regulating equipment is.
CN202010667965.1A 2020-07-13 2020-07-13 Method for improving operation efficiency of on-site automatic voltage regulation equipment of central urban power grid Pending CN112003287A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010667965.1A CN112003287A (en) 2020-07-13 2020-07-13 Method for improving operation efficiency of on-site automatic voltage regulation equipment of central urban power grid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010667965.1A CN112003287A (en) 2020-07-13 2020-07-13 Method for improving operation efficiency of on-site automatic voltage regulation equipment of central urban power grid

Publications (1)

Publication Number Publication Date
CN112003287A true CN112003287A (en) 2020-11-27

Family

ID=73466835

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010667965.1A Pending CN112003287A (en) 2020-07-13 2020-07-13 Method for improving operation efficiency of on-site automatic voltage regulation equipment of central urban power grid

Country Status (1)

Country Link
CN (1) CN112003287A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113327025A (en) * 2021-05-25 2021-08-31 广西电网有限责任公司电力科学研究院 Power distribution network asset operation efficiency analysis method, system and storage medium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
杨振睿等: "提高电网电压无功控制系统工作有效率的对策", 《电力科学与工程》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113327025A (en) * 2021-05-25 2021-08-31 广西电网有限责任公司电力科学研究院 Power distribution network asset operation efficiency analysis method, system and storage medium

Similar Documents

Publication Publication Date Title
CN107834567B (en) Reactive voltage coordination control method for extra-high voltage direct current converter station and near-field power plant
CN103326348B (en) A kind of system improving the analysis of area power grid power supply capacity and overall process on-line monitoring
CN101420126A (en) Distribution network electric energy quality composite control system and controlling method thereof
CN114597969B (en) Power distribution network double-layer optimization method considering intelligent soft switch and virtual power plant technology
CN109103898A (en) Learning algorithms method based on ultrashort-term wind power prediction error
CN107994608A (en) The reactive voltage control method of photovoltaic plant
CN110311403A (en) Low-voltage network voltage power integrated control method based on distributed photovoltaic power generation
CN203180536U (en) Reactive power optimization and integrated control system for voltage of regional power grid
CN112003287A (en) Method for improving operation efficiency of on-site automatic voltage regulation equipment of central urban power grid
CN113034205B (en) Energy storage station and transformer substation combined planning method considering capacity-to-load ratio dynamic adjustment
CN110808616B (en) Micro-grid frequency control method based on power shortage distribution
CN103166236B (en) A kind of AVC joint debugging method based on stillness wattless occurrence apparatus
CN111313466A (en) Sending-end power grid AGC optimization regulation and control method and system based on wind power priority regulation
CN115566693A (en) Load frequency modulation capacity evaluation method based on active-voltage coupling characteristic
CN113555878A (en) Platform district electric energy quality synthesizes compensation system
Vespucci et al. Centralized Optimal Management of Distribution Resources Considering the Effects of Local Controllers of Generators
CN109004672A (en) A method of improving rural power grids small power station grid entry point quality of voltage
CN116345585B (en) New energy power station and energy storage three-station integrated intelligent control strategy method
CN117578603B (en) Grid load balancing method based on regional new energy regulation
CN113162060B (en) Opportunity constraint optimization-based active power distribution network two-stage reactive power regulation method
Rubeša et al. Automated Tertiary Voltage Control in Transmission System
Xu et al. Research on optimization strategy of micro energy grid multi-station fusion mode control system
Yu et al. Two-layer collaborative architecture for distributed volt/var optimization and control in power distribution systems
Liu et al. Dynamic Allocation Method of Network-side Capacity Margin Based on Source-Load-Storage Interaction
CN115986765A (en) Overhead distribution line distributed reactive power compensation system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20201127

WD01 Invention patent application deemed withdrawn after publication