CN104868484B - Powerless control method is coordinated up and down by 220/110kV transformer stations - Google Patents

Abstract

The present invention provides 220/110 kV transformer stations and coordinates powerless control method up and down, comprises the following steps：（1）Obtain the electrical network parameter of area power grid；（2）Limit value is coordinated in calculating up and down；（3）Upper and lower correlated state is determined according to hysteretic characteristic；（4）Corresponding coordination control strategy up and down is selected by upper and lower correlated state.The present invention proposes a kind of 220 kV/110 kV power networks and coordinates powerless control method up and down, can be used for idle support of the 110 kV transformer stations to 220 kV transformer stations in area power grid, remaining reactive-load compensation equipment in area power grid can be effectively utilized, the critical point reactive power of the kV transformer stations of area power grid 220 is better adapted to the requirement of upper strata power network.

Description

Powerless control method is coordinated up and down by 220/110kV transformer stations

Technical field

The present invention relates to the idle operation method of power system, more particularly to a kind of 110kV power transformations based on hysteretic characteristic Stand and coordinate the powerless control method of 220kV transformer stations.

Background technology

In AC network, reactive power plays very crucial effect to the security and economy of power network.Idle work( Flowing of the rate in power network, can cause voltage landing and active power loss.In order to ensure operation voltage level and reduce active Power attenuation, idle control is a vital task of grid company.

Provincial power network traffic department can typically manage for the idle control effect of provincial power network to regional power grid scheduling department 220kV transformer stations in the range of linchpin propose the requirement of critical point Reactive Power Control, that is, provide the critical point reactive power of 220kV transformer stations Allowed band.

At present, area power grid is typically become using the method for controlling on the spot, the i.e. reactive requirement of 220kV transformer stations by 220kV The reactive-load compensation equipment in power station itself meets.This method for controlling on the spot is although simple and easy to apply, but when 220kV transformer stations When reactive-load compensation equipment is used up, it is impossible to effectively utilize the remaining reactive-load compensation equipment of 110kV transformer stations.Have now AVC systems start to introduce the strategy coordinated, but these strategies often independently of the another set of strategy for controlling on the spot, therefore easily Clashed with existing control strategy on the spot, cause the problem of reactive-load compensation equipment switching repeatedly.

In sum, existing coordination powerless control method also needs to further improvement.

The content of the invention

It is an object of the invention to solve the problems, such as that existing power-less optimized controlling method cannot be mutually coordinated, it is desirable to provide one That plants practicality coordinates powerless control method up and down in real time.

The present invention proposes that powerless control method is coordinated up and down by a kind of 220/110kV transformer stations, comprises the following steps：

(1) area power grid parameter is obtained；110kV of the area power grid comprising a 220kV transformer station and its institute's band becomes Power station；The area power grid parameter includes：Reactive-load compensation equipment single group capacity in each power transformation station name, each transformer station and The critical point reactive power allowed band of transformer gear upper and lower bound, each transformer station in quantity, each transformer station and low Pressure busbar voltage allowed band；Array CORD is created, the 110kV power transformations of idle coordination are carried out to 220kV transformer stations for depositing Name of station, the initial value of CORD is empty array；

(2) calculate and coordinate limit value Q up and down_cord.max1、Q_cord.max2、Q_cord.min1And Q_cord.min2：

(3) the reactive power/voltage control situation of area power grid is obtained；The reactive power/voltage control situation includes：110kV power transformations Stand and the critical point reactive power of 220kV transformer stations, low-voltage bus bar voltage, transformer current gear and reactive-load compensation equipment input group The critical point reactive power Q of number, wherein 220kV transformer stations₂₂₀Represent；

(4) Q is judged₂₂₀With Q_cord.max1、Q_cord.max2、Q_cord.min1And Q_cord.min2Magnitude relationship, it is true according to hysteretic characteristic Fixed upper and lower correlated state；Upper and lower correlated state is the condition for selecting upper and lower coordination control strategy, comprising starting, be failure to actuate, Release three kinds of states；If upper and lower correlated state is to start, into step (5)；If upper and lower correlated state enters step to release Suddenly (6)；If upper and lower correlated state is to be failure to actuate, into step (7)；

(5) if Q₂₂₀>Q_cord.max1, then all 110kV transformer stations for getting step (1) remove and have been stored in CORD The corresponding 110kV transformer stations of name of station, selected from remaining 110kV transformer stations critical point reactive power it is qualified and station in do not cut off Reactor and the maximum transformer station of the capacitor total capacity that does not put into, the critical point reactive power of the 110kV transformer stations is allowed Upper and lower bound in scope all reduces Q_110.com.max, 110kV transformer stations input capacitor or excision reactor are ordered about to mend Repay a part of reactive power of 220kV transformer stations, Q_110.com.maxRepresent area power grid in 110kV Substation Reactive-power Compensations equipment most Big single group capacity, and the 110kV transformer stations name of station is increased into the last of CORD, into step (7)；If Q₂₂₀<Q_cord.min1, then All 110kV transformer stations that step (1) is got remove the corresponding 110kV transformer stations of name of station being stored in CORD, from Select that critical point reactive power is qualified in remaining 110kV transformer stations and the capacitor not cut off and the reactor that does not put into are total in station The maximum transformer station of capacity, Q is all increased by the upper and lower bound in the critical point reactive power allowed band at the station_110.com.max, drive The 110kV transformer stations are made to put into reactor or excision capacitor to compensate a part of reactive power of 220kV transformer stations, and should 110kV transformer stations name of station increases to the last of CORD, into step (7)；

(6) if CORD is empty array, into step (7)；If CORD is not empty array, last unit of inquiry CORD Element, the critical point reactive power allowed band of the 110kV transformer stations that the element is represented is set to being somebody's turn to do for the middle acquisition of step (1) The critical point reactive power allowed band of 110kV transformer stations, and delete last element of CORD；

(7) the nine-zone diagram strategy commonly used according to current AVC is controlled to 110kV transformer stations, 220kV transformer stations；

(8) terminate this cycle and coordinate idle control up and down；Wait setting time, return to step (3).

Above-mentioned 220/110kV transformer stations are coordinated in powerless control method up and down, described to coordinate control up and down, refer to utilize The reactive-load compensation equipment of 110kV transformer stations, coordinates a kind of control of the reactive requirement of compensation 220kV transformer stations.

Above-mentioned 220/110kV transformer stations are coordinated in powerless control method up and down, the critical point refer to regional grid it Between power equipment assets and management scope boundary, typically using at transformer station's high-voltage side bus as critical point.

Above-mentioned 220/110kV transformer stations are coordinated in powerless control method up and down, described to coordinate limit value up and down, refer to for Judge the condition of upper and lower correlated state, limit value Q is coordinated up and down_cord.max1、Q_cord.max2、Q_cord.min1And Q_cord.min2Obtained by formula (1) ：

Q_cord.max1=Q_220.max+Q_110.com.max

Q_cord.max2=Q_220.max-Q_110.com.max (1)

Q_cord.min1=Q_220.min-Q_110.com.max

Q_cord.min2=Q_220.min+Q_110.com.max

Formula (1) comprising variable：220kV transformer stations critical points reactive power allowed band upper limit Q_220.maxWith lower limit Q_220.min；Ground 110kV Substation Reactive-power Compensations equipment maximum single group capacity Q in area's power network_110.com.max。

Above-mentioned 220/110kV transformer stations are coordinated in powerless control method up and down, and the hysteretic characteristic refers to 220kV power transformations The relation that critical point reactive power of standing is formed with upper and lower correlated state, 220kV transformer stations critical point reactive power and upper and lower correlated state Relation it is specific as follows：

(1) Q is worked as₂₂₀>Q_cord.max1, and do not have in 220kV transformer stations the reactor not cut off and do not put into capacitor when, Upper and lower correlated state is set on；

(2) Q is worked as₂₂₀<Q_cord.min1, and do not have in 220kV transformer stations the capacitor not cut off and do not put into reactor when, Upper and lower correlated state is set on；

(3) Q is worked as_cord.min2<Q₂₂₀<Q_cord.max2When, upper and lower correlated state is set to release；

(4) when not meeting the condition of (1)~(3), upper and lower correlated state is set to be failure to actuate.

Above-mentioned 220/110kV transformer stations are coordinated in powerless control method up and down, the nine-zone diagram strategy, are a kind of conventional Utilization real-time monitoring transformer station's low-voltage bus bar voltage and critical point reactive power transformer station's gear and reactive-load compensation equipment are entered The strategy of row control, its basis for estimation is 9 controls that the bound based on low-voltage bus bar voltage and critical point reactive power is constituted Area processed, when low-voltage bus bar voltage exceeds allowed band [U_min,U_max] or critical point reactive power exceed allowed band [Q_min,Q_max] When, control system is adjusted according to predetermined instruction, and each area's action scheme is as follows：

1st area：Low-voltage bus bar voltage is more than U_max, critical point reactive power is less than Q_min, capacitor or input reactor are cut off, when After capacitor complete resection and reactor whole input, low-voltage bus bar voltage is still greater than U_maxWhen, reduce transformer tap first gear Position；

2nd area：Low-voltage bus bar voltage is more than U_max, critical point reactive power is qualified, reduces load tap changer gear, works as tap After first gear position has been adjusted to deep low gear, low-voltage bus bar voltage is still greater than U_maxWhen, cut off capacitor or input reactor；

3rd area：Low-voltage bus bar voltage is more than U_max, critical point reactive power is more than Q_max, reduce load tap changer gear, when point After joint gear has been adjusted to deep low gear, low-voltage bus bar voltage is still greater than U_maxWhen, cut off capacitor or input reactor；

4th area：Low-voltage bus bar voltage is qualified, and critical point reactive power is less than Q_min, capacitor or input reactor are cut off, work as electricity After container complete resection and reactor whole input, operating point Reng Gai areas then maintain the operating point；

5th area：Low-voltage bus bar voltage is qualified, and critical point reactive power is qualified, maintains the operating point；

6th area：Low-voltage bus bar voltage is qualified, and critical point reactive power is more than Q_max, capacitor or excision reactor are put into, work as electricity Container all puts into and after reactor complete resection, operating point Reng Gai areas then maintain the operating point；

7th area：Low-voltage bus bar voltage is less than U_min, critical point reactive power is less than Q_min, raise load tap changer gear, when point After joint gear has been adjusted to highest shelves, low-voltage bus bar voltage is still less than U_minWhen, put into capacitor or excision reactor；

8th area：Low-voltage bus bar voltage is less than U_min, it is idle qualified, raise load tap changer gear, when tap gear Be adjusted to it is most high-grade after, input capacitor or excision reactor；

9th area：Low-voltage bus bar voltage is less than U_min, critical point reactive power is more than Q_max, capacitor or excision reactor are put into, when Capacitor all puts into and after reactor complete resection, low-voltage bus bar voltage is still less than U_minWhen, raise transformer tap first gear Position.

Compared with prior art, the beneficial effects of the present invention are：

(1) reactive-load compensation equipment of 110kV transformer stations is transferred, coordinates the reactive requirement of compensation 220kV transformer stations, Ke Yiyou Remaining reactive-load compensation equipment in effect land productivity area power grid；

(2) coordination control strategy is simply clear and definite, is improved on the basis of control strategy on the spot, does not result in tactful punching The prominent problem so as to cause equipment switching repeatedly.

Brief description of the drawings

Fig. 1 is that powerless control method is coordinated up and down by the 220kV/110kV transformer stations based on hysteretic characteristic that the present invention is provided Schematic flow sheet.

Fig. 2 is the hysteretic characteristic curve of upper and lower correlated state-upper and lower harmony value.

Fig. 3 is somewhere power network schematic diagram.

Specific embodiment

Specific implementation of the invention is described further below in conjunction with accompanying drawing and example.

Fig. 1 reflects the specific stream that powerless control method is coordinated up and down by the 220kV/110kV transformer stations based on hysteretic characteristic Journey.Specifically include：

(1) area power grid parameter is obtained；110kV of the area power grid comprising a 220kV transformer station and its institute's band becomes Power station；The area power grid parameter includes：Reactive-load compensation equipment single group capacity in the title of each transformer station, each transformer station With the transformer gear upper and lower bound in quantity, each transformer station, the critical point reactive power allowed band of each transformer station and Low-voltage bus bar voltage allowed band；Array CORD is created, the 110kV for carrying out idle coordination to 220kV transformer stations for depositing becomes Power station name of station, the initial value of CORD is empty array；

(2) calculate and coordinate limit value Q up and down_cord.max1、Q_cord.max2、Q_cord.min1And Q_cord.min2；

Q_cord.max1、Q_cord.max2、Q_cord.min1And Q_cord.min2Obtained by formula (1)：

Q_cord.max1=Q_220.max+Q_110.com.max

Q_cord.max2=Q_220.max-Q_110.com.max (1)

Q_cord.min1=Q_220.min-Q_110.com.max

Q_cord.min2=Q_220.min+Q_110.com.max

Formula (1) comprising variable：220kV transformer stations critical points reactive power allowed band upper limit Q_220.maxWith lower limit Q_220.min；Ground 110kV Substation Reactive-power Compensations equipment maximum single group capacity Q in area's power network_110.com.max；

(3) the reactive power/voltage control situation of area power grid is obtained；The reactive power/voltage control situation includes：110kV power transformations Stand and the critical point reactive power of 220kV transformer stations, low-voltage bus bar voltage, transformer current gear and reactive-load compensation equipment input group The critical point reactive power Q of number, wherein 220kV transformer stations₂₂₀Represent；

(4) Q is judged₂₂₀With Q_cord.max1、Q_cord.max2、Q_cord.min1And Q_cord.min2Magnitude relationship, it is true according to hysteretic characteristic Fixed upper and lower correlated state；Upper and lower correlated state is the condition for selecting upper and lower coordination control strategy, comprising starting, be failure to actuate, Release three kinds of states；If upper and lower correlated state is to start, into step (5)；If upper and lower correlated state enters step to release Suddenly (6)；If upper and lower correlated state is to be failure to actuate, into step (7)；

The determination method of upper and lower correlated state is as follows：

A. Q is worked as₂₂₀>Q_cord.max1, and do not have in 220kV transformer stations the reactor not cut off and do not put into capacitor when, Upper and lower correlated state is set on；

B. Q is worked as₂₂₀<Q_cord.min1, and do not have in 220kV transformer stations the capacitor not cut off and do not put into reactor when, Upper and lower correlated state is set on；

C. Q is worked as_cord.min2<Q₂₂₀<Q_cord.max2When, upper and lower correlated state is set to release；

When d. not meeting the condition of a, b, c, upper and lower correlated state is set to be failure to actuate；

Upper and lower correlated state forms a kind of relation of hysteretic characteristic with upper and lower harmony value, and Fig. 2 gives and coordinates shape up and down The hysteretic characteristic curve of state-upper and lower harmony value；

(5) if Q₂₂₀>Q_cord.max1, then all 110kV transformer stations for getting step (1) remove and have been stored in CORD The corresponding 110kV transformer stations of name of station, from remaining 110kV transformer stations, select critical point reactive power it is qualified and station in do not cut The reactor for removing and the maximum transformer station of the capacitor total capacity not put into, the critical point reactive power of the 110kV transformer stations is permitted Perhaps the upper and lower bound in scope all reduces Q_110.com.max, Q_110.com.maxRepresent 110kV Substation Reactive-power Compensations in area power grid Equipment maximum single group capacity, and the 110kV transformer stations name of station is increased into the last of CORD, into step (7)；If Q₂₂₀< Q_cord.min1, then the corresponding 110kV of name of station that all 110kV transformer stations removing for getting step (1) has been stored in CORD Transformer station, from remaining 110kV transformer stations, selects that critical point reactive power is qualified and the capacitor that does not cut off and is not put into station The maximum transformer station of reactor total capacity, the upper and lower bound in the critical point reactive power allowed band at the station is all increased Q_110.com.max, and the 110kV transformer stations name of station is increased into the last of CORD, into step (7)；

(6) if CORD is empty array, into step (7)；If CORD is not empty array, last unit of inquiry CORD Element, the critical point reactive power allowed band of the 110kV transformer stations that the element is represented is set to being somebody's turn to do for the middle acquisition of step (1) The critical point reactive power allowed band of 110kV transformer stations, and delete last element of CORD；

(7) the nine-zone diagram strategy commonly used according to current AVC is controlled to 110kV transformer stations, 220kV transformer stations；

(8) terminate this cycle and coordinate idle control up and down；Wait next controlling cycle (such as 15 minutes), return to step (3).

The following is an example of the inventive method, emulated by taking the power network of somewhere as an example, Fig. 3 shows the power network Topological structure, A represents 220kV power transformation station names in figure, and B1, B2, B3, B4, B5 represent the title of 110kV transformer stations respectively.

(1) known by Fig. 3, this area's power network has 1 220kV transformer stations A, transformer station A to carry 5 110kV transformer stations, title Respectively B1, B2, B3, B4, B5；This area's power network is configured without reactor, single group capacity and the quantity such as institute of table 1 of capacitor Show；

The single group capacity and quantity of the capacitor of table 1

Transformer gear upper and lower bound in each transformer station is as shown in table 2；

The transformer gear upper and lower bound of table 2

Transformer station	The gear upper limit	Gear lower limit	Transformer station	The gear upper limit	Gear lower limit
						A	5	1	B3	17	1
B1	17	1	B4	17	1
						B2	17	1	B5	17	1

The critical point reactive power allowed band and low-voltage bus bar voltage allowed band of each transformer station are as shown in table 3；

The critical point reactive power allowed band of table 3 and low-voltage bus bar voltage allowed band

Set up an empty array CORD；

(2) calculate and coordinate limit value Q up and down_cord.max1、Q_cord.max2、Q_cord.min1And Q_cord.min2；

Q_cord.max1=Q_220.max+Q_110.com.max=8+4Mvar=12Mvar

Q_cord.max2=Q_220.max-Q_110.com.max=8-4Mvar=4Mvar

Q_cord.min1=Q_220.min-Q_110.com.max=-8-4Mvar=-12Mvar

Q_cord.min2=Q_220.min+Q_110.com.max=-8+4Mvar=-4Mvar

In above formula, Q_220.max、Q_220.minRespectively the 220kV transformer stations critical point reactive power allowed band upper limit, lower limit； Q_110.com.maxIt is 110kV Substation Reactive-power Compensations equipment maximum single group capacity in area power grid.

(3) in a certain controlling cycle, critical point reactive power, the low-voltage bus bar of 110kV transformer stations and 220kV transformer stations are obtained Voltage, transformer current gear and reactive-load compensation equipment input group number are as shown in table 4；In this embodiment, reactive-load compensation equipment Refer to capacitor；

The reactive power/voltage control situation of table 4

Q is known by table₂₂₀=12.38Mvar；

(4) Q is judged to obtain₂₂₀>Q_cord.max1, and (this area's power network does not have not to have the capacitor that does not put into 220kV transformer stations Configuration reactor), therefore upper and lower correlated state is set to start；

(5) Q is judged to obtain₂₂₀>Q_cord.max1, and now CORD is sky, and transformer station B2 is selected to obtain in all 110kV transformer stations Critical point reactive power it is qualified and do not put into capacitor total capacity maximum (this area's power network is configured without reactor), remain 3 groups The capacitor of 4Mvar is not put into, therefore the critical point reactive power allowed band upper and lower bound of transformer station B2 is all reduced Q_110.com.max(reducing 4Mvar), and transformer station's B5 names of station are increased into CORD；

After the completion of this step, the critical point reactive power allowed band of transformer station B2 is [- 8,0] Mvar, CORD={ B2 }；

The nine-zone diagram strategy commonly used according to current AVC is controlled to 110kV transformer stations, 220kV transformer stations, control result To put into a group capacitor 110kV transformer stations B2, other transformer stations are failure to actuate more.

The idle control of coordination up and down of other controlling cycles can be carried out according to the proposed method, no longer be gone to live in the household of one's in-laws on getting married herein State.

After by coordinating idle control up and down, compared to the control idle on the spot do not coordinated up and down, 110kV power transformations Standing one group of capacitor of 4Mvar of put into B2 more, table 5 give the critical point of 220kV transformer stations A under two kinds of powerless control methods without Work(power contrast.

The critical point reactive power contrast of 220kV transformer stations A under 5 two kinds of powerless control methods of table

	Idle control on the spot	Coordinate idle control up and down
			Critical point reactive power	12.38Mvar	8.22Mvar

When as shown in Table 5, using independent powerless control method, the reactive-load compensation equipment of 110kV transformer stations cannot be to 220kV Transformer station is supported, and the critical point reactive power of 220kV transformer stations deviates allowed band farther out；And when using of the invention upper and lower When coordinating powerless control method, the reactive-load compensation equipment of 110kV transformer stations can be supported 220kV transformer stations, compensation The reactive power sent under 220kV substation sections, makes the critical point reactive power of 220kV transformer stations closer to allowed band.And, Can also be seen that in powerless control method is coordinated up and down 110kV transformer stations are carried out to 220kV transformer stations from the data in table After support, the critical point reactive power of 220kV transformer stations makes upper and lower correlated state be in the interval being failure to actuate, anti-so as to avoid The situation of multiple control.

Above-described embodiment is the present invention preferably implementation method, but embodiments of the present invention are not by above-described embodiment Limitation, other it is any without departing from the modification made under Spirit Essence of the invention and principle, modification, replacement, combination, simplification, Equivalent substitute mode is should be, should be all included within protection scope of the present invention.

Claims (1)

1. Powerless control method is coordinated up and down by 1.220/110kV transformer stations, it is characterised in that comprise the following steps：

   (1) area power grid parameter is obtained；110kV transformer station of the area power grid comprising a 220kV transformer station and its institute's band； The area power grid parameter includes：Reactive-load compensation equipment single group capacity sum in the title of each transformer station, each transformer station Transformer gear upper and lower bound, the critical point reactive power allowed band and low pressure of each transformer station in amount, each transformer station Busbar voltage allowed band；Array CORD is created, the 110kV transformer stations of idle coordination are carried out to 220kV transformer stations for depositing Name of station, the initial value of CORD is empty array；

   (2) calculate and coordinate limit value Q up and down_cord.max1、Q_cord.max2、Q_cord.min1And Q_cord.min2；It is described to coordinate limit value up and down, refer to For judging the condition of upper and lower correlated state, limit value Q is coordinated up and down_cord.max1、Q_cord.max2、Q_cord.min1And Q_cord.min2By formula (1) obtain：

   $\begin{array}{c}{Q}_{cord.\max 1}=Q_{220.\max }+Q_{110.com.\max }\\ Q_{cord.\max 2}=Q_{220.\max }-Q_{110.com.\max }\\ Q_{cord.\min 1}=Q_{220.\min }-Q_{110.com.\max }\\ Q_{cord.\min 2}=Q_{220.\min }+Q_{110.com.\max }\end{array}---\left(1\right)$

   Formula (1) comprising variable：220kV transformer stations critical points reactive power allowed band upper limit Q_220.maxWith lower limit Q_220.min；Regional electricity 110kV Substation Reactive-power Compensations equipment maximum single group capacity Q in net_110.com.max；

   (3) the reactive power/voltage control situation of area power grid is obtained；The reactive power/voltage control situation includes：110kV transformer stations and The critical point reactive power of 220kV transformer stations, low-voltage bus bar voltage, transformer current gear and reactive-load compensation equipment input group number, The wherein critical point reactive power Q of 220kV transformer stations₂₂₀Represent；

   (4) Q is judged₂₂₀With Q_cord.max1、Q_cord.max2、Q_cord.min1And Q_cord.min2Magnitude relationship, according to hysteretic characteristic determine on Lower correlated state；Upper and lower correlated state is the condition for selecting upper and lower coordination control strategy, comprising starting, be failure to actuate, release Three kinds of states；If upper and lower correlated state is to start, into step (5)；If upper and lower correlated state is to release, into step (6)；If upper and lower correlated state is to be failure to actuate, into step (7)；The hysteretic characteristic refers to that 220kV transformer stations critical point is idle The relation that power is formed with upper and lower correlated state, 220kV transformer stations critical point reactive power is specific with the relation of upper and lower correlated state It is as follows：

   (3.1) Q is worked as₂₂₀>Q_cord.max1, and do not have in 220kV transformer stations the reactor not cut off and do not put into capacitor when, will Upper and lower correlated state is set on；

   (3.2) Q is worked as₂₂₀<Q_cord.min1, and do not have in 220kV transformer stations the capacitor not cut off and do not put into reactor when, will Upper and lower correlated state is set on；

   (3.3) Q is worked as_cord.min2<Q₂₂₀<Q_cord.max2When, upper and lower correlated state is set to release；

   (3.4) when not meeting the condition of (3.1)~(3.3), upper and lower correlated state is set to be failure to actuate；

   (5) if Q₂₂₀>Q_cord.max1, then the station that all 110kV transformer stations removing for getting step (1) has been stored in CORD The corresponding 110kV transformer stations of name, the electricity selected that critical point reactive power is qualified from remaining 110kV transformer stations and do not cut off in station Anti- device and the maximum transformer station of the capacitor total capacity not put into, by the critical point reactive power allowed band of the 110kV transformer stations In upper and lower bound all reduce Q_110.com.max, Q_110.com.maxRepresent area power grid in 110kV Substation Reactive-power Compensations equipment most Big single group capacity, and the 110kV transformer stations name of station is increased into the last of CORD, into step (7)；If Q₂₂₀<Q_cord.min1, then All 110kV transformer stations that step (1) is got remove the corresponding 110kV transformer stations of name of station being stored in CORD, from Select that critical point reactive power is qualified in remaining 110kV transformer stations and the capacitor not cut off and the reactor that does not put into are total in station The maximum transformer station of capacity, Q is all increased by the upper and lower bound in the critical point reactive power allowed band at the station_110.com.max, and The 110kV transformer stations name of station is increased into the last of CORD, into step (7)；

   (6) if CORD is empty array, into step (7)；If CORD is not empty array, last element of CORD is inquired about, will The critical point reactive power allowed band of the 110kV transformer stations that the element is represented is set to the 110kV power transformations obtained in step (1) The critical point reactive power allowed band stood, and delete last element of CORD；

   (7) the nine-zone diagram strategy commonly used according to current automatism voltage control is controlled to 110kV transformer stations, 220kV transformer stations； The nine-zone diagram strategy is transformer station's low-voltage bus bar voltage and critical point reactive power of a kind of utilization real-time monitoring to transformer station's shelves The strategy that position and reactive-load compensation equipment are controlled；

   (8) terminate this cycle and coordinate idle control up and down；Wait setting time, return to step (3).