CN111725814B - Reactive replacement method for extra-high voltage converter station phase-change regulator and substation reactive equipment - Google Patents
Reactive replacement method for extra-high voltage converter station phase-change regulator and substation reactive equipment Download PDFInfo
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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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- 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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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention relates to a reactive replacement method for a phase-change machine of an extra-high voltage converter station and reactive equipment of a transformer substation, and belongs to the technical field of power grid dispatching. According to the method, a secondary voltage control area is established according to the voltage condition input by the AVC function of the extra-high voltage converter station, the high voltage direct current converter station where the extra-high voltage converter station is located and the near-area power grid, the coordination control of the extra-high voltage converter station and reactive equipment of other substations is carried out on the area, enough reactive margin is reserved for the extra-high voltage converter station, the static voltage stability margin of the power grid is improved, and therefore the transient voltage stability level of the power grid is improved.
Description
Technical Field
The invention relates to a reactive replacement method for a phase-change machine of an extra-high voltage converter station and reactive equipment of a transformer substation, and belongs to the technical field of power grid dispatching.
Background
An automatic voltage control (AVC, automatic Voltage Control) system is an important means for realizing safe (voltage stability margin improvement), economical (network loss reduction) and high-quality (voltage qualification rate improvement) operation of a power transmission network. The AVC system is constructed on a power grid Energy Management System (EMS), can utilize real-time operation data of a power grid, scientifically decides an optimal reactive voltage adjustment scheme from the perspective of global optimization of the power grid, and automatically distributes the optimal reactive voltage adjustment scheme to a power plant, a transformer substation and a lower power grid dispatching mechanism for execution. Sun Hong, zhang Baming, guo Qinglai describes the architecture of large grid automatic voltage control in soft partition based global voltage optimization control system design (power system automation, 2003, volume 27, 8 th, pages 16-20).
The master station part of the AVC system is realized based on software in a power system control center, and the voltage control strategy of the AVC system to the power transmission network mainly comprises reactive power control strategies to all generators of a power plant and reactive power equipment control strategies of a transformer substation in class 2. The reactive power control strategy for each generator of the power plant adopts the following main modes at present: after reactive power adjustment quantity of each generator set of the power plant is obtained through reactive power optimization calculation by the AVC master station system of the dispatching center, the reactive power adjustment quantity is sent to an AVC substation system of the power plant through a data communication channel, and after the AVC substation of the power plant receives the reactive power adjustment quantity of the generator, reactive power sent by the generator is adjusted in a stepping mode according to the running state of each generator in the current power plant until the reactive power adjustment quantity issued by the AVC master station is reached. The reactive power equipment control strategy of the transformer substation is a switching instruction of reactive power compensation equipment, wherein the reactive power equipment mainly comprises a capacitor and a reactor, and when the capacitor is switched in or the reactor is cut off, the bus voltage is increased; when the capacitor is cut off or the reactor is put in, the bus voltage decreases. The AVC master station issues an instruction for switching in or switching off the reactive equipment, and an automatic monitoring system in the transformer substation finds a breaker connected with the reactive equipment according to the received instruction and switches on or off the breaker so as to complete switching in or switching off of the reactive equipment.
The extra-high voltage converter station phase regulator has good sub-transient characteristics, and the potential can not change at the moment of failure occurrence, and reactive power can be emitted or absorbed at the moment. After the extra-high voltage converter station phase-regulating machine is arranged at the direct current receiving end, reactive power can be sent out to provide support for the voltage of a power grid, particularly, a multi-direct current feed-in power grid can improve the simultaneous commutation success rate, so that the safety extra-high voltage converter station phase-regulating machine of the power grid is guaranteed to have good secondary transient characteristics, the potential can not change in the moment of failure, and reactive power can be sent out or absorbed in the moment. After the extra-high voltage converter station phase-adjusting device is arranged at the direct current receiving end, reactive power can be sent out to provide support for the voltage of a power grid, particularly, a multi-direct current feed-in power grid can improve the simultaneous commutation success rate, so that the power grid is ensured to safely arrange the extra-high voltage converter station phase-adjusting device at the direct current receiving end, reactive power can be absorbed, transient overvoltage is limited, particularly, the direct current receiving end for the external transmission of new energy can effectively inhibit the off-grid of the new energy, and the transmission proportion meets the requirement. The extra-high voltage converter station phase regulator has good transient characteristics, namely strong excitation characteristics, and can emit reactive power which is not less than twice the rated power in a shorter time. After the extra-high voltage converter station regulating camera is arranged at the direct current receiving end, if the system fails to enable the voltage to drop obviously, the extra-high voltage converter station regulating camera starts to be excited strongly, the stability of the system is ensured, good conditions are created for the recovery of direct current power and voltage, and the effect of avoiding voltage breakdown is achieved.
With the development of extra-high voltage direct current construction, china has stepped into a new era of large-capacity extra-high voltage alternating current-direct current interconnection of regional power grids, and the 'strong-direct-weak-alternating-current' characteristics of the power grids are outstanding. The eastern China power grid is used as a receiving end power grid fed into the largest number of direct current power transmission systems in the world, and the problems of voltage stability and the like caused by the direct current systems are quite remarkable. In the direct current commutation failure and recovery process, a large amount of reactive power can be absorbed from the system, and if the direct current blocking is caused by the commutation failure, the impact is generated on the stability of the power grid. Compared with other reactive equipment, the new generation extra-high voltage converter station phase-regulating machine can provide dynamic voltage support through forced excitation, the risk of commutation failure of a direct-current system is reduced, voltage fluctuation is restrained by using the transient characteristic of the extra-high voltage converter station phase-regulating machine, system voltage is quickly recovered, analysis shows that the extra-high voltage converter station phase-regulating machine can improve the static voltage stability margin of the system, improve the transient voltage stability level of the system, and solve various voltage stability problems of a receiving end power grid. And in steady state operation, the extra-high voltage converter station phase regulator can also maintain voltage stability and serve as a regional voltage regulating means. In the year 2015, the national grid company decides to configure a certain number of extra-high voltage converter station cameras in each regional power grid. The extra-high voltage converter station phase-regulating machines of the east China power grid are arranged at 8 converter stations: jinhua converter station, fengxian converter station, suzhou converter station, political platform converter station, huai-lan converter station, shaoxing converter station, taizhou converter station and Guquan converter station, 18 extra-high voltage converter stations of 300Mvar are configured in total for regulating cameras. The extra-high voltage converter station phase modulation unit adopts an extra-high voltage converter station phase modulation unit to connect wires, is connected to a 500kV converter station bus or is connected to a 500kV filter bus. The power grid is ensured to keep enough dynamic reactive power reserve through AVC control, and how to position the dynamic reactive power compensation device is a new problem.
Disclosure of Invention
The invention aims to provide a reactive replacement method for an extra-high voltage converter station phase-change machine and reactive equipment of a transformer substation, which is used for realizing coordination control of the extra-high voltage converter station phase-change machine and the reactive equipment of other transformer substations in an area, reserving enough reactive margin for the extra-high voltage converter station phase-change machine, improving the static voltage stability margin of a power grid and improving the transient voltage stability level of the power grid.
The invention provides a reactive replacement method for an extra-high voltage converter station phase-change regulator and reactive equipment of a transformer substation, which comprises the following steps:
(1) Setting the automatic voltage control period as T c ；
(2) Acquiring power grid network structure data from a power grid dispatching system, constructing a regional power grid model which is coordinated with a 500kV bus of an extra-high voltage converter station, and recording as
Wherein,representing that the extra-high voltage converter station and the near zone participate in coordination control of 500kV transformer substation, N seats are added up, and the total is->500kV bus for representing participation in coordination control in 500kV transformer substation of ultra-high voltage converter station and near zone, and 500kV bus
K total buses are counted;
(3) At each automatic voltage control period T c When coming, the reactive normal operating point parameters Q of the extra-high voltage converter station phase-change machine S are respectively read from the automatic voltage control system of the power grid nom-s Reactive replacement threshold value parameter Q of extra-high voltage converter station phase-regulating machine S max And reactive power adjustment step length Q step And the reactive voltage power C of the extra-high voltage converter station phase regulator S to the extra-high voltage converter station 500kV bus m is read s-m ,m∈K；
(4) Reading voltage measurement value V of 500kV bus m in extra-high voltage converter station from power grid dispatching system m Reading the operation upper limit parameter value V of the 500kV bus m from the automatic voltage control system of the power grid m-max And a running lower limit parameter value V m-min For V m And (3) judging:
V m-min ＜V m ＜V m-max (1)
V m ≤V m-min or V m ≥V m-max (2)
If V m If the formula (1) is satisfied, the process proceeds to step (5), and if V m Satisfying the formula (2), returning to the step (2);
(5) Reading real-time reactive power measurement value Q of extra-high voltage converter station dispatching camera S from power grid dispatching system r-s For Q r-s Make a judgment if Q r-s ≠Q nom-s Step (6) is entered, if Q r-s ＝Q nom-s Reactive replacement is not needed, and the step (2) is returned;
(6) Calculating reactive displacement quantity delta Q of extra-high voltage converter station phase regulator S, wherein delta Q=Q nom-s -Q r-s Judging the delta Q, if the delta Q is more than Q step Then calculating the actual reactive displacement delta Q of the extra-high voltage converter station phase-regulating machine S s If DeltaQ is greater than or equal to 0, deltaQ s ＝Q step If DeltaQ < 0, deltaQ s ＝-(Q step ) Step (7) is entered, if |ΔQ s |≤Q step Returning to the step (2);
(7) According to the reactive voltage sensitivity parameter C of the extra-high voltage converter station phase-change machine S read in the step (2) to the extra-high voltage converter station 500kV bus m s-m Calculating reactive displacement delta Q of extra-high voltage converter station phase regulator S s After adjustment, the voltage value V 'of 500kV bus m of the extra-high voltage converter station' m ，V′ m ＝V m +(C s *ΔQ s )；
(8) V 'calculated in step (7)' m Judging if V is satisfied m-min ＜V′ m ＜V m-max Step (10) is entered, if V 'is satisfied' m ≤V m-min Or V' m ≥V m-max Step (9) is entered;
(9) Reading characteristics from an automatic voltage control system of a power grid500kV bus participating in coordination control in high-voltage converter station and near-area 500kV transformer substationSensitivity matrix C of (2) sens-k Traversing sensitivity matrix C sens-k All 500kV buses participating in coordination control, the sensitivity of the 500kV buses participating in coordination control to the bus m of the extra-high voltage converter station is read, and an array C [ j ] is formed according to the sensitivity from large to small][c sens-j-m ]Wherein j represents->Bus number, j E K, c sens-j-m Let j=1, the sensitivity value of the busbar with the number j to the busbar m of the extra-high voltage converter station, if V' m ≤V m-min Step (9-1) is entered, if V' m ≥V m-max Step (9-2) is entered;
(9-1) selecting a near zone corresponding to a bus with the number j to participate in the coordinated control of the 500kV substationReactive resources in the station are calculated to generate the transformer substation +.>The reactive power increasing strategy for assisting in increasing the voltage of the bus m of the extra-high voltage converter station comprises the following specific processes:
(9-1-1) reading the substation from the grid dispatching SystemReactive power measurement Q of low-voltage side of medium main transformer j And an increasable reactive value Q add-j For Q add-j Make a judgment if Q add-j If > 0, go to step (9-1-2), if Q add-j If the temperature is less than or equal to 0, the step (9-1-3) is carried out;
(9-1-2) pair Q j Make a judgment if Q j Less than 0, cut off the transformer substationLow-voltage side reactor of (1), if Q j More than or equal to 0, the transformer station is put into>The low-voltage side capacitor in (2) is returned to the step (3);
(9-1-3) returning to step (9-1) with j=j+1;
(9-2) selecting a near zone corresponding to a bus with the number j to participate in the coordinated control of the 500kV substationReactive resource in the transformer substation is calculated and generated>The reactive power reduction strategy for assisting in reducing the voltage of a bus m in an extra-high voltage converter station comprises the following steps of:
(9-2-1) reading the substation from the grid dispatching SystemReactive power measurement Q of low-voltage side of internal main transformer j And reducible reactive value Q dec-j For Q dec-j Make a judgment if Q dec-j If > 0, go to step (9-2-2), if Q dec-j If the temperature is less than or equal to 0, the step (9-2-3) is carried out;
(9-2-2) pair Q j Make a judgment if Q j > 0, then cut off the substationLow voltage of (1) capacitor, if Q j The transformer station is put into the transformer station if the temperature is less than or equal to 0>The low-voltage side reactor in (3) is returned to;
(9-2-3) returning j=j+1 to step (9-2);
(10) Reactive power adjustment quantity delta Q of extra-high voltage converter station phase adjustment machine S in step (6) s To judge if DeltaQ s More than 0, the extra-high voltage converter station phase regulator S inputs capacitive reactive powerPower delta Q s If DeltaQ s If the power is not equal to 0, the extra-high voltage converter station phase regulator S keeps the original reactive power unchanged, and if the power is not equal to delta Q s Less than 0, the extra-high voltage converter station phase regulator S inputs inductive reactive power |delta Q s I, the reactive value of the extra-high voltage converter station phase regulator S is made to be the reactive normal operation point parameter Q nom-s The reactive replacement of the extra-high voltage converter station phase-change regulator and the reactive equipment of the transformer substation is realized.
The reactive replacement method for the extra-high voltage converter station phase-change regulator and the reactive equipment of the transformer substation has the advantages that:
according to the reactive power replacement method for the extra-high voltage converter station phase-change machine and the reactive power equipment of the transformer substation, a secondary voltage control area is established according to the voltage condition input by the AVC function of the extra-high voltage converter station phase-change machine and the high-voltage direct current converter station where the extra-high voltage converter station phase-change machine is located and the power grid in the near region, the coordination control of the extra-high voltage converter station phase-change machine and the other reactive power equipment is carried out on the area, enough reactive power margin is reserved for the extra-high voltage converter station phase-change machine, the static voltage stability margin of the power grid is improved, and therefore the transient voltage stability level of the power grid is improved.
Drawings
Fig. 1 is a flow chart of the method of the present invention.
Detailed Description
The reactive replacement method for the extra-high voltage converter station phase-change regulator and the reactive equipment of the transformer substation, provided by the invention, has a flow chart shown in figure 1, and comprises the following steps:
(1) Setting the automatic voltage control period as T c ；
(2) Acquiring power grid network structure data from a power grid dispatching system, constructing a regional power grid model which is coordinated with a 500kV bus of an extra-high voltage converter station, and recording as
Wherein,representing that the extra-high voltage converter station and the near zone participate in coordination control of 500kV transformer substation, N seats are added up, and the total is->500kV bus for representing participation in coordination control in 500kV transformer substation of ultra-high voltage converter station and near zone, and 500kV bus
K total buses are counted;
(3) At each automatic voltage control period T c When coming, the reactive normal operating point parameters Q of the extra-high voltage converter station phase-change machine S are respectively read from the automatic voltage control system of the power grid nom-s Reactive replacement threshold value parameter Q of extra-high voltage converter station phase-regulating machine S max And reactive power adjustment step length Q step And the reactive voltage power C of the extra-high voltage converter station phase regulator S to the extra-high voltage converter station 500kV bus m is read s-m ,m∈K；
(4) Reading voltage measurement value V of 500kV bus m in extra-high voltage converter station from power grid dispatching system m Reading the operation upper limit parameter value V of the 500kV bus m from the automatic voltage control system of the power grid m-max And a running lower limit parameter value V m-min For V m And (3) judging:
V m-min ＜V m ＜V m-max (1)
V m ≤V m-min or V m ≥V m-max (2)
If V m If the formula (1) is satisfied, the process proceeds to step (5), and if V m Satisfying the formula (2), returning to the step (2);
(5) Reading real-time reactive power measurement value Q of extra-high voltage converter station dispatching camera S from power grid dispatching system r-s For Q r-s Make a judgment if Q r-s ≠Q nom-s Step (6) is entered, if Q r-s ＝Q nom-s Reactive replacement is not needed, and the step (2) is returned;
(6) Calculating reactive displacement delta Q of the extra-high voltage converter station phase regulator S,ΔQ＝Q nom-s -Q r-s judging the delta Q, if the delta Q is more than Q step Then calculating the actual reactive displacement delta Q of the extra-high voltage converter station phase-regulating machine S s If DeltaQ is greater than or equal to 0, deltaQ s ＝Q step If DeltaQ < 0, deltaQ s ＝-(Q step ) Step (7) is entered, if |ΔQ s |≤Q step Returning to the step (2);
(7) According to the reactive voltage sensitivity parameter C of the extra-high voltage converter station phase-change machine S read in the step (2) to the extra-high voltage converter station 500kV bus m s-m Calculating reactive displacement delta Q of extra-high voltage converter station phase regulator S s After adjustment, the voltage value V 'of 500kV bus m of the extra-high voltage converter station' m ，V′ m ＝V m +(C s *ΔQ s )；
(8) V 'calculated in step (7)' m Judging if V is satisfied m-min ＜V′ m ＜V m-max Step (10) is entered, if V 'is satisfied' m ≤V m-min Or V' m ≥V m-max Step (9) is entered;
(9) The result of the calculation in the step (8) requires a near zone transformer station of the extra-high voltage converter stationThe low-voltage side reactive equipment of (1) participates in coordination, and 500kV buses participating in coordination control in an extra-high voltage converter station and a near-zone 500kV transformer substation are read from an automatic voltage control system of a power grid>Sensitivity matrix C of (2) sens-k Traversing sensitivity matrix C sens-k All 500kV buses participating in coordination control, the sensitivity of the 500kV buses participating in coordination control to the bus m of the extra-high voltage converter station is read, and an array C [ j ] is formed according to the sensitivity from large to small][c sens-j-m ]Wherein j represents->Bus number, j E K, c sens-j-m Indicating bus pair extra-high numbered jThe sensitivity value of the busbar m of the converter station is j=1, if V' m ≤V m-min Step (9-1) is entered, if V' m ≥V m-max Step (9-2) is entered;
(9-1) selecting a near zone corresponding to a bus with the number j to participate in the coordinated control of the 500kV substationReactive resources in the station are calculated to generate the transformer substation +.>The reactive power increasing strategy for assisting in increasing the voltage of the bus m of the extra-high voltage converter station comprises the following specific processes:
(9-1-1) reading the substation from the grid dispatching SystemReactive power measurement Q of low-voltage side of medium main transformer j And an increasable reactive value Q add-j For Q add-j Make a judgment if Q add-j If > 0, go to step (9-1-2), if Q add-j If the temperature is less than or equal to 0, the step (9-1-3) is carried out;
(9-1-2) pair Q j Make a judgment if Q j Less than 0, cut off the transformer substationLow-voltage side reactor of (1), if Q j More than or equal to 0, the transformer station is put into>The low-voltage side capacitor in (2) is returned to the step (3);
(9-1-3) returning to step (9-1) with j=j+1;
(9-2) selecting a near zone corresponding to a bus with the number j to participate in the coordinated control of the 500kV substationReactive resource in the transformer substation is calculated and generated>The reactive power reduction strategy for assisting in reducing the voltage of a bus m in an extra-high voltage converter station comprises the following steps of:
(9-2-1) reading the substation from the grid dispatching SystemReactive power measurement Q of low-voltage side of internal main transformer j And reducible reactive value Q dec-j For Q dec-j Make a judgment if Q dec-j If > 0, go to step (9-2-2), if Q dec-j If the temperature is less than or equal to 0, the step (9-2-3) is carried out;
(9-2-2) pair Q j Make a judgment if Q j > 0, then cut off the substationLow voltage of (1) capacitor, if Q j The transformer station is put into the transformer station if the temperature is less than or equal to 0>The low-voltage side reactor in (3) is returned to;
(9-2-3) returning j=j+1 to step (9-2);
(10) Reactive power adjustment quantity delta Q of extra-high voltage converter station phase adjustment machine S in step (6) s To judge if DeltaQ s More than 0, the extra-high voltage converter station phase regulator S inputs the capacitive reactive power delta Q s If DeltaQ s If the power is not equal to 0, the extra-high voltage converter station phase regulator S keeps the original reactive power unchanged, and if the power is not equal to delta Q s Less than 0, the extra-high voltage converter station phase regulator S inputs inductive reactive power |delta Q s I, the reactive value of the extra-high voltage converter station phase regulator S is made to be the reactive normal operation point parameter Q nom-s The reactive replacement of the extra-high voltage converter station phase-change regulator and the reactive equipment of the transformer substation is realized.
Claims (1)
1. The reactive power replacement method for the extra-high voltage converter station phase-change regulator and the reactive power equipment of the transformer substation is characterized by comprising the following steps of:
(1) Setting the automatic voltage control period as T c ；
(2) Acquiring power grid network structure data from a power grid dispatching system, constructing a regional power grid model which is coordinated with a 500kV bus of an extra-high voltage converter station, and recording as
Wherein,representing that the extra-high voltage converter station and the near zone participate in coordination control of 500kV transformer substation, N seats are added up, and the total is->The method comprises the steps of representing 500kV buses which participate in coordination control in an extra-high voltage converter station and a near-area coordination control 500kV transformer substation, wherein K total 500kV buses are counted;
(3) At each automatic voltage control period T c When coming, the reactive normal operating point parameters Q of the extra-high voltage converter station phase-change machine S are respectively read from the automatic voltage control system of the power grid nom-s Reactive replacement threshold value parameter Q of extra-high voltage converter station phase-regulating machine S max And reactive power adjustment step length Q step And the reactive voltage power C of the extra-high voltage converter station phase regulator S to the extra-high voltage converter station 500kV bus m is read s-m ,m∈K；
(4) Reading voltage measurement value V of 500kV bus m in extra-high voltage converter station from power grid dispatching system m Reading the operation upper limit parameter value V of the 500kV bus m from the automatic voltage control system of the power grid m-max And a running lower limit parameter value V m-min For V m And (3) judging:
V m-min ＜V m ＜V m-max (1)
V m ≤V m-min or V m ≥V m-max (2)
If V m If the formula (1) is satisfied, the process proceeds to step (5), and if V m Satisfying the formula (2), returning to the step (2);
(5) Reading real-time reactive power measurement value Q of extra-high voltage converter station dispatching camera S from power grid dispatching system r-s For Q r-s Make a judgment if Q r-s ≠Q nom-s Step (6) is entered, if Q r-s ＝Q nom-s Reactive replacement is not needed, and the step (2) is returned;
(6) Calculating reactive displacement quantity delta Q of extra-high voltage converter station phase regulator S, wherein delta Q=Q nom-s -Q r-s Judging the delta Q, if the delta Q is more than Q step Then calculating the actual reactive displacement delta Q of the extra-high voltage converter station phase-regulating machine S s If DeltaQ is greater than or equal to 0, deltaQ s ＝Q step If DeltaQ < 0, deltaQ s ＝-(Q step ) Step (7) is entered, if |ΔQ s |≤Q step Returning to the step (2);
(7) According to the reactive voltage sensitivity parameter C of the extra-high voltage converter station phase-change machine S read in the step (2) to the extra-high voltage converter station 500kV bus m s-m Calculating reactive displacement delta Q of extra-high voltage converter station phase regulator S s After adjustment, the voltage value V 'of 500kV bus m of the extra-high voltage converter station' m ，V’ m ＝V m +(C s *ΔQ s )；
(8) V 'calculated in step (7)' m Judging if V is satisfied m-min ＜V’ m ＜V m-max Step (10) is entered, if V 'is satisfied' m ≤V m-min Or V' m ≥V m-max Step (9) is entered;
(9) 500kV bus participating in coordination control in extra-high voltage converter station and near-zone 500kV transformer substation is read from automatic voltage control system of power gridSensitivity matrix C of (2) sens-k Traversing sensitivity matrix C sens-k All 500kV buses participating in coordination control, and reading 500kV bus pair extra-high voltage converter station participating in coordination controlThe sensitivity of bus m is formed into array C j from high sensitivity to low sensitivity][c sens-j-m ]Wherein j represents->Number of bus bar>Let j=1, the sensitivity value of the busbar with the number j to the busbar m of the extra-high voltage converter station, if V' m ≤V m-min Step (9-1) is entered, if V' m ≥V m-max Step (9-2) is entered;
(9-1) selecting a near zone corresponding to a bus with the number j to participate in the coordinated control of the 500kV substationReactive resources in the station are calculated to generate the transformer substation +.>The reactive power increasing strategy for assisting in increasing the voltage of the bus m of the extra-high voltage converter station comprises the following specific processes:
(9-1-1) reading the substation from the grid dispatching SystemReactive power measurement Q of low-voltage side of medium main transformer j And an increasable reactive value Q add-j For Q add-j Make a judgment if Q add-j If > 0, go to step (9-1-2), if Q add-j If the temperature is less than or equal to 0, the step (9-1-3) is carried out;
(9-1-2) pair Q j Make a judgment if Q j Less than 0, cut off the transformer substationLow-voltage side reactor of (1), if Q j More than or equal to 0, the transformer station is put into>The low-voltage side capacitor in (2) is returned to the step (3);
(9-1-3) returning to step (9-1) with j=j+1;
(9-2) selecting a near zone corresponding to a bus with the number j to participate in the coordinated control of the 500kV substationReactive resource in the transformer substation is calculated and generated>The reactive power reduction strategy for assisting in reducing the voltage of a bus m in an extra-high voltage converter station comprises the following steps of:
(9-2-1) reading the substation from the grid dispatching SystemReactive power measurement Q of low-voltage side of internal main transformer j And reducible reactive value Q dec-j For Q dec-j Make a judgment if Q dec-j If > 0, go to step (9-2-2), if Q dec-j If the temperature is less than or equal to 0, the step (9-2-3) is carried out;
(9-2-2) pair Q j Make a judgment if Q j > 0, then cut off the substationLow voltage of (1) capacitor, if Q j The transformer station is put into the transformer station if the temperature is less than or equal to 0>The low-voltage side reactor in (3) is returned to;
(9-2-3) returning j=j+1 to step (9-2);
(10) Reactive power adjustment quantity delta Q of extra-high voltage converter station phase adjustment machine S in step (6) s To judge if DeltaQ s More than 0, the extra-high voltage converter station phase regulator S inputs the capacitive reactive power delta Q s If DeltaQ s If the power is not equal to 0, the extra-high voltage converter station phase regulator S keeps the original reactive power unchanged, and if the power is not equal to delta Q s ＜0，The extra-high voltage converter station phase-regulating machine S inputs inductive reactive power |delta Q s I, the reactive value of the extra-high voltage converter station phase regulator S is made to be the reactive normal operation point parameter Q nom-s The reactive replacement of the extra-high voltage converter station phase-change regulator and the reactive equipment of the transformer substation is realized.
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| CN107834567A (en) * | 2017-11-30 | 2018-03-23 | 国家电网公司西北分部 | The reactive voltage control method for coordinating of UHVDC converter station and near region power plant |
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