CN104466972A - Voltage reactive distribution type control method making substation and power distribution network being harmonious - Google Patents

Voltage reactive distribution type control method making substation and power distribution network being harmonious Download PDF

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Publication number
CN104466972A
CN104466972A CN201410779212.4A CN201410779212A CN104466972A CN 104466972 A CN104466972 A CN 104466972A CN 201410779212 A CN201410779212 A CN 201410779212A CN 104466972 A CN104466972 A CN 104466972A
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voltage
power
distribution network
reactive
station
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CN104466972B (en
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张传永
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STATE GRID FUJIAN ZHAOAN POWER SUPPLY Co
State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
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STATE GRID FUJIAN ZHAOAN POWER SUPPLY Co
State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The invention provides a voltage reactive distribution type control method making a substation and a power distribution network being harmonious. The voltage reactive distribution type control method comprises the steps that firstly, voltage reactive state information of the substation and voltage reactive state information of a reactive compensation device of the power distribution network subordinate to the substation are collected in real time through a wide area measuring information system, and the switching state information of the reactive compensation device is controlled; secondly, whether the substation and the power distribution network meet respective examination requirements is judged according to the voltage reactive state information of the substation and the power distribution network; finally, a preset substation and power distribution network harmony control strategy is executed according to an examination and evaluation result of the substation and the power distribution network. According to the voltage reaction distribution type control method, only the voltage reactive state information of a part of devices in the power distribution network is collected, the operation states of the substation and the power distribution network can be accurately judged through sensitivity calculation, the data volume of real-time collection and the data volume of calculation are small, the calculation speed is high, the installation cost and the operation and maintenance cost of a collecting and controlling device is small, the practicability is high, and application and popularization are convenient.

Description

The voltage power-less distributed control method of coordination is joined at a kind of station
Technical field
The present invention relates to power system transformer substation and power distribution network Coordinated Control field, more particularly, the voltage power-less distributed control method of coordination is joined at a kind of station relating to electric power system terminal 110kV (or 35kV) transformer station and its subordinate's power distribution network cooperation control.
Background technology
At present, the regulation and control criterion of the voltage power-less adjusting device installed in electric power system terminal 110kV (or 35kV) transformer station and in subordinate's power distribution network only carries out independent control according to the real-time measuring data at mounting points place, in transformer station, the adjustment of the tap gear of main transformer only judges according to the actual measurement voltage of transformer station's outgoing line side, in standing, the switching of reactive-load compensation equipment only judges according to the reactive power (or power factor) of transforming plant lead-in side, and the mesolow reactive-load compensation equipment in distribution only carries out switching according to the reactive requirement on the spot of this equipment.Mutual the whole network cooperation control is not carried out between one-end substation and its subordinate's distribution, often there is transformer station's outgoing line side voltage, inlet wire side power factor is within the scope of interval of acceptance, in distribution, voltage power-less regulating measure has been used up and the still out-of-limit situation of distribution transforming voltage, or distribution transforming voltage is within the scope of interval of acceptance in distribution, transformer station's regulating measure is used up and the still out-of-limit situation of interior voltage power-less of standing, or transformer station and distribution all meet voltage power-less check requirements, but the network loss of power distribution network is higher, the situation of network loss can also be reduced further.
Now, transformer station and subordinate's power distribution network thereof is needed fully to excavate respective regulating power, implement the automatic assistance adjustment of transformer station and subordinate's power distribution network thereof, being regulated by the whole network makes transformer station and subordinate's power distribution network thereof farthest meet check requirements, reduce network loss simultaneously, propose to implement " coordination is joined at station " control thus and carry out the means that research and discovery excavates one-end substation and subordinate's power distribution network operation regulating and controlling potentiality thereof further.
The method of existing transformer station and its subordinate's power distribution network cooperation control, as civilian in " transformer station, circuit, the three grades of uniting and adjustment of distribution transforming voltage " in the 01st phase " electrification of the countryside " in 2011, disclosed method is: first, Real-time Collection distribute-electricity transformer district low-voltage customer voltage, distribution transforming voltage power-less state, voltage regulator voltage, main transformer voltage power-less state, and transformer station, circuit and distribution transforming voltage & var control status information of equipment; Secondly, whether out-of-limit to higher level's analytical voltage by subordinate according to the order of low-voltage customer, distribution transforming, voltage regulator, main transformer, make out-of-limit voltage qualified by higher level to subordinate's regulation voltage control appliance; Then, analyze to subordinate idle whether out-of-limit according to the order of main transformer, circuit, distribution transforming by higher level, regulate idle control appliance to make out-of-limit reactive power qualified by subordinate to higher level.
But the major defect of the method is:
1) the method only embodies when low-voltage customer is out-of-limit, can by regulate transformer station, circuit and distribution transforming voltage power-less conditioning equipment to improve low-voltage customer voltage, but do not embody transforming plant voltage reactive out-of-limit and cannot regulate time, how by regulating voltage power-less equipment in distribution to improve the voltage power-less state of transformer station, and the voltage power-less not embodying transformer station and distribution all not out-of-limit time, how to reach the method reducing further network loss;
2) first the method judges voltage status and regulates, and after voltage-regulation completes, then judges idle state and regulates, but voltage and idlely have contacting of intercoupling in practical power systems, can not separate regulation;
3) the idle coordination control strategy of tertiary voltage that the method is formulated does not consider action frequency restriction every day of transforming plant main transformer tap gear and station inner capacitor group, and main transformer tap gear may be caused out-of-limit with station inner capacitor group action frequency;
4) the method needs low-voltage customer voltage, distribution transforming voltage power-less state, voltage regulator voltage, the main transformer voltage power-less state of measuring whole power distribution network in real time, and transformer station, circuit and all distribution transformings voltage & var control status information of equipment, for power distribution network, the installation quantity of its measurement mechanism and control device is quite huge, the installation cost brought and operation expense are all comparatively large, are not generally suitable for for the large-scale power distribution network of reality.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of outgoing line side rate of qualified voltage and the inlet wire side power factor qualification rate that can improve one-end substation are largely provided, improve the rate of qualified voltage of distribution low-voltage side in power distribution network, and reduce distribution network loss significantly; And the voltage power-less distributed control method of coordination is joined at the station with general applicability.
Technical scheme of the present invention is as follows:
A voltage power-less distributed control method for coordination is joined at station, first, by the voltage power-less state information of wide area measurement information system Real-time Collection transformer station and subordinate's distribution network var compensation equipment thereof, controls the switching state information of reactive-load compensation equipment; Then, judge whether transformer station and power distribution network meet the check requirements preset respectively according to the voltage power-less state information of transformer station and power distribution network; Finally, perform the station of presetting according to the examination assessment result of transformer station and power distribution network and join coordination control strategy.
As preferably, the examination assessment result of transformer station and power distribution network comprises:
Transformer station meets voltage power-less appraisal standards, and power distribution network meets voltage appraisal standards;
Transformer station meets voltage power-less appraisal standards, and afc voltage appraisal standards are discontented with by power distribution network;
Transformer station is discontented with the idle appraisal standards of afc voltage, and power distribution network meets voltage appraisal standards;
Transformer station is discontented with the idle appraisal standards of afc voltage, and afc voltage appraisal standards are discontented with by power distribution network.
As preferably, when transformer station is discontented with the idle appraisal standards of afc voltage, when afc voltage appraisal standards are discontented with by power distribution network, the principle regulating and controlling to follow is: first by regulating voltage power-less equipment in transformer station to meet transforming plant voltage reactive check requirements, then by regulating distribution network var compensation equipment to meet distribution network voltage check requirements, if transformer station or power distribution network still do not meet check requirements, then carry out mutual cooperation control.
As preferably, first, meet transforming plant voltage reactive check requirements by regulating voltage power-less equipment in transformer station; Then, perform transformer station and meet voltage power-less appraisal standards, control strategy during afc voltage appraisal standards is discontented with by power distribution network; If voltage power-less equipment does not meet transforming plant voltage reactive check requirements again in transformer station, then calculate the reactive power demand in each region in feeder line, if reactive-load compensation equipment has adjustment nargin in feeder line, then according to reactive power demand, inject the idle order descending to the sensitivity coefficient of minimum or the highest distribution transforming voltage place voltage according to reactive-load compensation equipment position place in feeder line to drop into or excise, meet the voltage check requirements of distribution low-voltage side; If after above-mentioned adjustment, power distribution network meets voltage appraisal standards, and transformer station is discontented with the idle appraisal standards of afc voltage, then perform power distribution network and meet voltage appraisal standards, transformer station is discontented with the control strategy of the idle appraisal standards of afc voltage, otherwise, stop adjustment process.
As preferably, when transformer station meets voltage power-less appraisal standards, when afc voltage appraisal standards are discontented with by power distribution network, first calculate the reactive power demand in each region in feeder line;
If reactive-load compensation equipment has adjustment nargin in feeder line, then according to historical trend information, calculate low-pressure reactive compensation equipment position place in feeder line and inject the idle sensitivity coefficient to actual measurement distribution transforming place voltage, real-time detection power distribution network all 10kV branch lines head end and the distribution transforming of end place and the low-pressure side voltage of low-pressure reactive compensation equipment place distribution transforming is installed, find minimum value in the low-pressure side voltage of out-of-limit distribution transforming or distribution transforming corresponding to maximum, according to the reactive power demand in region each in feeder line, the idle sensitivity coefficient to this distribution transforming place voltage is injected according to low-pressure reactive compensation equipment place, descending order drops into, or ascending order is excised, in distribution, reactive-load compensation equipment meets the voltage check requirements of distribution low-voltage side, and in transformer station, voltage power-less meets check requirements all the time simultaneously.
As preferably, when transformer station is discontented with the idle appraisal standards of afc voltage, when power distribution network meets voltage appraisal standards, the situation that the main transformer outgoing line side voltage of transformer station is idle with inlet wire side in station and control strategy as follows:
When main transformer outgoing line side Over High-Limit Voltage or more lower limit, and in station, inlet wire side is idle without time out-of-limit, first adjusts main transformer outgoing line side voltage to normal range (NR), otherwise, excision or drop into the interior reactive-load compensation equipment in station; In if stood, voltage power-less regulating measure is used up and main transformer outgoing line side the voltage still more upper limit or more lower limit, then regulate distribution network var compensation equipment, excision or the interior reactive power compensator injecting the idle larger position of sensitivity to main transformer low-pressure side voltage of input distribution, ensure that power distribution network meets voltage check requirements simultaneously;
When main transformer outgoing line side voltage is without out-of-limit, and in station the idle more upper limit in inlet wire side or more lower in limited time, first drop into or excise the reactive power compensation of reactive-load compensation equipment in station, regulate main transformer high-pressure side idle to normal range (NR), in if stood, voltage power-less regulating measure has been used up and the idle upper limit of still getting in main transformer high-pressure side, then regulate distribution network var compensation equipment, drop into or inject in excision distribution the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point, ensure that power distribution network meets voltage check requirements simultaneously;
When the idle all more upper limit in inlet wire side or more lower limit in main transformer outgoing line side voltage with station, first main transformer outgoing line side voltage is adjusted to normal range (NR), in regulation station, inlet wire side is idle again, if main transformer high-pressure side the is idle still more upper limit or more lower limit, then drop into again or reactive-load compensation equipment in excision station, in if stood, voltage power-less regulating measure is used up and main transformer the high-pressure side idle still more upper limit or more lower limit, then regulate distribution network var compensation equipment, drop into or inject in excision distribution the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point, ensure that power distribution network meets voltage check requirements simultaneously,
When main transformer outgoing line side voltage gets over lower limit, the idle more upper limit in inlet wire side in standing, or main transformer outgoing line side Over High-Limit Voltage, in standing inlet wire side idle more lower in limited time, first drop into or excise the reactive power compensation of reactive-load compensation equipment in station, regulate main transformer high-pressure side idle to normal range (NR), whether detection main transformer low-pressure side voltage is normal, if main transformer outgoing line side voltage still more lower limit or the more upper limit, then adjust main transformer outgoing line side voltage to normal range (NR); If after dropping into or excise the interior reactive-load compensation equipment in station, main transformer high-pressure side the is idle still more upper limit or more lower limit, in standing, voltage power-less conditioning equipment cannot regulate again, then adjust distribution network var compensation equipment, drop into or inject in excision power distribution network the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point, ensure that power distribution network meets voltage check requirements simultaneously.
As preferably, when transformer station meets voltage power-less appraisal standards, when power distribution network meets voltage appraisal standards, first the reactive power demand in each region in feeder line is calculated, then the idle sensitivity coefficient to network loss is injected according to reactive-load compensation equipment position place in feeder line, descending order drops into, or ascending order is excised; Under the prerequisite of voltage power-less check requirements meeting transformer station and power distribution network, meet the reactive power demand in each region in feeder line simultaneously, reduce distribution network loss.
As preferably, before gathering the voltage power-less state information of transformer station and subordinate's distribution network var compensation equipment thereof, determine that the cooperation control moment is joined at station according to daily load curve, be specially:
First adopt load curve fusion method to carry out segmentation to transformer station's outgoing line side reactive power daily load curve, be restricted to x time according to transforming plant main transformer tap gear action frequency every day, daily load curve be divided into x section; Then the equivalent reactive power of m period system is Q m, then adjacent time interval m and m+1 load variations amount absolute value are:
ΔQ m＝|Q m-Q m+1|；
Wherein, Δ Q mfor adjacent time interval m and m+1 load or burden without work variable quantity absolute value, Q mbe the equivalent reactive power of m period system, Q m+1it is the equivalent reactive power of m+1 period system;
By Δ Q mq time minimum mcorresponding period m and m+1 merges into a new period m, characterizes the load level merging rear new period m with the load level of former period m initial time;
Repeat merging process, until remaining fixed number reaches expected numbers x, after having merged, join the cooperation control moment using the initial time of each new period as station.
As preferably, join the cooperation control moment according to station and station is carried out to transformer station and subordinate's power distribution network thereof join cooperation control; By wide area measurement information system, the voltage power-less state information of equipment component in Real-time Collection transformer station and subordinate's power distribution network thereof, comprising:
Power distribution network all 10kV branch lines head end and the distribution transforming of end place and the low-pressure side information of voltage U of low-pressure reactive compensation equipment place distribution transforming is installed zi;
The meritorious P at feeder line critical point g, idle Q ginformation;
Main transformer low-pressure side and on high-tension side voltage U land U h, active-power P land P h, reactive power Q land Q h;
The switching state information of control appliance, comprises the input capacity Qc of distribution low-voltage side reactive power compensator pt, the input capacity Qc of reactive power compensation system device lr, main transformer tap gear D, the input capacity Qc of Reactive Power Compensation Eqyuipment in Substation t.
As preferably, judge whether transformer station and subordinate's power distribution network thereof meet respective voltage power-less appraisal standards, and concrete steps are as follows:
1) the voltage power-less appraisal standards of transformer station and power distribution network are inputted:
Input transformer station outgoing line side voltage appraisal standards U t1~ U t2; Input transforming plant lead-in side power factor standard comprise peak hours power factor appraisal standards power factor appraisal standards during low ebb load input distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2;
2) judge whether transformer station and power distribution network meet voltage power-less appraisal standards:
Whether transformer station meets voltage power-less appraisal standards, is specially: main transformer low-pressure side voltage U lwhether meet transformer station outgoing line side voltage appraisal standards U t1~ U t2, and main transformer high-pressure side power factor whether meet transforming plant lead-in side power factor standard
Whether power distribution network meets voltage appraisal standards, is specially: power distribution network all 10kV branch lines head end and the distribution transforming of end place and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transforming ziwhether meet distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2qualification rate reach more than 90%.
Beneficial effect of the present invention is as follows:
Method of the present invention can in power distribution network distribution transforming voltage be discontented with sufficient check requirements and distribution network var compensation equipment without adjustment nargin time, to improve the running status of power distribution network, the rate of qualified voltage of power distribution network is improved largely by suitably regulating voltage power-less equipment in transformer station; Can when in transformer station, voltage or reactive power constraints and interior voltage power-less equipment of standing be without adjustment nargin, by suitably regulating distribution network var compensation equipment to improve the running status of transformer station, improve rate of qualified voltage and the power factor qualification rate of transformer station largely; When transformer station and subordinate's power distribution network thereof meet voltage power-less check requirements simultaneously, by suitably regulating distribution network var compensation equipment to improve the running status of power distribution network, distribution network loss can be reduced largely; Consider action frequency restriction every day of main transformer tap gear in transformer station, can ensure to meet the voltage power-less check requirements of transformer station and its subordinate's power distribution network in every day in action frequency restriction as far as possible.
Method of the present invention only gathers the voltage power-less state information of equipment component in power distribution network, just by sensitivity calculations can judge the running status of transformer station and power distribution network exactly and control accordingly, the data volume of Real-time Collection and computing is little, computational speed is fast, installation cost and the operation expense of collection and control appliance are less, practical, easy to utilize.
The present invention can be widely used in the cooperation control of electric power system 110kV (or 35kV) one-end substation and its subordinate's power distribution network, for reliable basis is laid in transformer station and its subordinate's power distribution network synthesis idle work optimization analysis, for promoting that the development of China's electric distribution network reactive-voltage operation and management level and intelligent distribution network correlation theory and technology is significant.
Accompanying drawing explanation
Fig. 1 judges whether transformer station and power distribution network meet voltage power-less appraisal standards flow chart;
Fig. 2 is the control strategy taked for situation of 2. planting;
Tu3Shi transformer station nine-area control;
3. Fig. 4 plants for control strategy situation " 1 " or " 5 " region taked;
3. Fig. 5 plants for control strategy situation " 3 " or " 7 " region taked;
3. Fig. 6 plants for control strategy situation " 2 " or " 6 " region taked;
3. Fig. 7 plants for control strategy situation " 4 " or " 8 " region taked;
4. Fig. 8 plants for control strategy situation " 1 " or " 5 " region taked;
4. Fig. 9 plants for control strategy situation " 3 " or " 7 " region taked;
4. Figure 10 plants for control strategy situation " 2 " or " 6 " region taked;
4. Figure 11 plants for control strategy situation " 4 " or " 8 " region taked;
Figure 12 is transformer station's outgoing line side reactive power daily load curve segmentation result.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
The voltage power-less distributed AC servo system Strategy Design of coordination is joined at a kind of station of the present invention, by the voltage power-less state information of equipment component in wide area measurement information system Real-time Collection transformer station and subordinate's power distribution network thereof, and the switching state information of control appliance; Judge whether it meets respective check requirements according to the voltage power-less state information of transformer station and power distribution network again; Then, corresponding station is taked to join coordination control strategy according to transformer station to power distribution network examination assessment result separately.
The concrete steps of described method are as follows:
Step (1): determine that the cooperation control moment is joined at station according to daily load curve.
First adopt load curve fusion method to carry out segmentation to transformer station's outgoing line side reactive power daily load curve, be restricted to x time according to transforming plant main transformer tap gear action frequency every day, daily load curve be divided into x section.If the equivalent reactive power of m period system is Q m, then adjacent time interval m and m+1 load variations amount absolute value are:
ΔQ m＝|Q m-Q m+1|；
Wherein: Δ Q mfor adjacent time interval m and m+1 load or burden without work variable quantity absolute value, Q mbe the equivalent reactive power of m period system, Q m+1it is the equivalent reactive power of m+1 period system.
Find Δ Q mq time minimum mthe corresponding period, period m and m+1 is merged into a new period m, with the load level of former period m initial time characterize merge after the load level of new period.Repeat merging process, until remaining fixed number reaches expected numbers x.After having merged, join the cooperation control moment using the initial time of day part as station.
Step (2): the state information of Real-time Collection transformer station and subordinate's power distribution network thereof.
After step (1) completes, according to the control moment determined, station is carried out to transformer station and subordinate's power distribution network thereof and join cooperation control.By wide area measurement information system, the voltage power-less state information of equipment component in Real-time Collection transformer station and subordinate's power distribution network thereof, comprises power distribution network all 10kV branch lines head end and the distribution transforming of end place and is provided with the low-pressure side information of voltage U of low-pressure reactive compensation equipment place distribution transforming zi, the meritorious P at feeder line critical point g, idle Q ginformation, main transformer low-pressure side and on high-tension side voltage U land U h, active-power P land P h, reactive power Q land Q h; And the switching state information of control appliance, comprise the input capacity Qc of distribution low-voltage side reactive power compensator pt, the input capacity Qc of reactive power compensation system device lr, main transformer tap gear D, the input capacity Qc of Reactive Power Compensation Eqyuipment in Substation t.
Step (3): judge whether transformer station and subordinate's power distribution network thereof meet voltage power-less appraisal standards.
After step (2) completes, according to the voltage power-less status data of step (2) Real-time Collection, judge whether transformer station and subordinate's power distribution network thereof meet respective voltage power-less appraisal standards, and concrete steps are as follows:
Step 3.1): the voltage power-less appraisal standards of input transformer station and power distribution network.
Input transformer station outgoing line side voltage appraisal standards U t1~ U t2; Input transforming plant lead-in side power factor standard comprise peak hours power factor appraisal standards power factor appraisal standards during low ebb load input distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2.
Step 3.2): judge whether transformer station and power distribution network meet voltage power-less appraisal standards.
Step 3.1) complete after, the voltage power-less state information according to transformer station and power distribution network judges whether it meets respective appraisal standards, is divided into following four kinds of situations:
The 1. to plant situation be that transformer station meets voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage U lmeet transformer station outgoing line side voltage appraisal standards U t1~ U t2, and main transformer high-pressure side power factor meet transforming plant lead-in side power factor standard power distribution network meets voltage appraisal standards, i.e. power distribution network all 10kV branch lines head end and the distribution transforming of end place and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transforming zimeet distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2qualification rate reach more than 90%.
The 2. to plant situation be that transformer station meets voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage U lmeet transformer station outgoing line side voltage appraisal standards U t1~ U t2, and main transformer high-pressure side power factor meet transforming plant lead-in side power factor standard afc voltage appraisal standards are discontented with by power distribution network, i.e. power distribution network all 10kV branch lines head end and the distribution transforming of end place and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transforming zimeet distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2qualification rate lower than 90%.
The 3. to plant situation be that transformer station is discontented with the idle appraisal standards of afc voltage, i.e. main transformer low-pressure side voltage U ldo not meet transformer station outgoing line side voltage appraisal standards U t1~ U t2, or main transformer high-pressure side power factor do not meet transforming plant lead-in side power factor standard power distribution network meets voltage appraisal standards, i.e. power distribution network all 10kV branch lines head end and the distribution transforming of end place and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transforming zimeet distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2qualification rate reach more than 90%.
The 4. to plant situation be that transformer station is discontented with the idle appraisal standards of afc voltage, i.e. main transformer low-pressure side voltage U ldo not meet transformer station outgoing line side voltage appraisal standards U t1~ U t2, or main transformer high-pressure side power factor do not meet transforming plant lead-in side power factor standard afc voltage appraisal standards are discontented with by power distribution network, i.e. power distribution network all 10kV branch lines head end and the distribution transforming of end place and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transforming zimeet distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2qualification rate lower than 90%.
Concrete analysis judges that flow process as shown in Figure 1.
Step (4): take corresponding station to join coordination control strategy according to examination assessment result.
After step (3) completes, corresponding station is taked to join coordination control strategy according to transformer station and subordinate's power distribution network examination assessment result separately thereof.First according to the flow state under history typical load level, power distribution network is carried out subregion, follow with reactive power compensator on bar be regional center, feeder line is divided into j region by the reactive power minimum principle that flows between region, is calculated the reactive requirement proportionality coefficient α in each region in feeder line by the flow state under typical load level j.By the total reactive requirement amount Q of feeder line ai=(Q gi+ Qc pi+ Qc li) calculate the reactive power demand Q in each region aj-Need, computing formula is as follows:
Q aj-Need＝Q a×α j；
Wherein: Q aj-Needfor the reactive power demand in each region, Q afor the reactive power power Q at feeder line critical point gpower (Qc is dropped into reactive-load compensation equipment in feeder line pt+ Qc lr) sum, α jfor the reactive requirement proportionality coefficient in region each in feeder line.
Concrete control strategy is as follows:
Step 4.1): for step 3.2) the control strategy taked of the situation of 1. planting.
In this situation, transformer station meets voltage power-less appraisal standards, and power distribution network meets voltage appraisal standards.
First by formula Q aj-Need=Q a× α jcalculate the reactive power demand Q in each region in feeder line aj-Need, then injects the idle order descending to the sensitivity coefficient of network loss according to reactive-load compensation equipment position place in feeder line and drop into, or ascending order is excised.Under the prerequisite of voltage power-less check requirements meeting transformer station and power distribution network, the reactive power demand in each region in As soon as possible Promising Policy feeder line, reaches with this object reducing distribution network loss further.
Step 4.2): for step 3.2) the control strategy taked of the situation of 2. planting.
In this situation, transformer station meets voltage power-less appraisal standards, and afc voltage appraisal standards are discontented with by power distribution network.
First by formula Q aj-Need=Q a× α jcalculate the reactive power demand Q in each region in feeder line aj-Need.If reactive-load compensation equipment has adjustment nargin in feeder line, then calculate low-pressure reactive compensation equipment position place in feeder line according to historical trend information and inject the idle sensitivity coefficient to actual measurement distribution transforming place voltage:
S QU＝ΔU ti/ΔQ t；
Wherein: S qUfor i max× t maxthe injection of scale is idle to voltage sensibility matrix, Δ Q tfor single pool-size of distribution low-voltage side reactive power compensator, Δ U tifor dropping into Δ Q tthe voltage change of rear actual measurement distribution transforming place.
By the voltage U of actual measurement distribution transforming zi, find out-of-limit U zithe distribution transforming that middle minimum value (or maximum) is corresponding, according to the reactive power demand Q in each region aj-Need, inject the idle sensitivity coefficient S to this distribution transforming place voltage according to low-pressure reactive compensation equipment place qUreactive-load compensation equipment in distribution that descending order drops into (or excision), farthest to meet the voltage check requirements of distribution low-voltage side.Ensure that in transformer station, voltage power-less meets its check requirements all the time simultaneously.
After distribution network var compensation equipment carries out switching, if the low-pressure side voltage of a large amount of distribution transforming still gets over lower limit, then suitably raise main transformer tap gear and make main transformer low-pressure side voltage U lraise; If the low-pressure side Over High-Limit Voltage of a large amount of distribution transforming, then suitably lower main transformer tap gear and make main transformer low-pressure side voltage U lreduce.All the time to ensure in transformer station's adjustment process that main transformer voltage power-less meets check requirements.Its concrete control strategy as shown in Figure 2.
Step 4.3) for step 3.2) the control strategy taked of the situation of 3. planting.
In this situation, transformer station is discontented with the idle appraisal standards of afc voltage, and power distribution network meets voltage appraisal standards.
When transformer station is discontented with the idle appraisal standards of afc voltage, be described in detail with the running status that transformer station's nine-zone diagram is different.Transformer station's nine-area control as shown in Figure 3.
When main transformer runs on " 1 " region in Fig. 3, main transformer Over High-Limit Voltage and idle without out-of-limit situation.First main transformer tap gear is adjusted to reach the object of step-down.If now main transformer outgoing line side current path is to normal range (NR), then proceed to step 4.1) control strategy; If now main transformer low-pressure side voltage still gets over the upper limit, then suitably excise reactive-load compensation equipment in station.In if stood, voltage power-less regulating measure is used up and the interior voltage still more upper limit of standing, then consider the cooperation control of distribution network var compensation equipment.Inject the reactive power compensator of the idle larger position of sensitivity to main transformer low-pressure side voltage in suitable excision distribution, ensure that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy as shown in Figure 4.
When main transformer runs on " 5 " region in Fig. 3, main transformer voltage gets over lower limit and idle without out-of-limit situation.First main transformer tap gear is adjusted to reach the object of boosting.If now main transformer outgoing line side current path is to normal range (NR), then proceed to step 4.1) control strategy; If now main transformer low-pressure side voltage still gets over lower limit, then suitably drop into reactive-load compensation equipment in station.In if stood, voltage power-less regulating measure is used up and interior voltage still more lower limit of standing, then consider the cooperation control of distribution network var compensation equipment.Inject the reactive power compensator of the idle larger position of sensitivity to main transformer low-pressure side voltage in suitable input distribution, ensure that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy as shown in Figure 4.
When main transformer runs on " 3 " region in Fig. 3, main transformer is idle more the upper limit and voltage without out-of-limit situation.First suitably drop into reactive-load compensation equipment in station, if main transformer high-pressure side is idle after regulating fall back to normal range (NR), then proceed to step 4.1) control strategy.In if stood, Reactive-power control means have been used up and the idle upper limit of still getting in main transformer high-pressure side, then consider the cooperation control of distribution network var compensation equipment.Inject the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point in suitable input distribution, ensure that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy as shown in Figure 5.
When main transformer runs on " 7 " region in Fig. 3, main transformer is idle more lower limit and voltage without out-of-limit situation.First suitably reactive-load compensation equipment in excision station, if main transformer high-pressure side is idle after regulating fall back to normal range (NR), then proceeds to step 4.1) control strategy.In if stood, Reactive-power control means have been used up and the idle lower limit of still getting in main transformer high-pressure side, then consider the cooperation control of distribution network var compensation equipment.Inject the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point in suitable excision distribution, ensure that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy as shown in Figure 5.
When main transformer runs on " 2 " region in Fig. 3, main transformer voltage and the idle more upper limit simultaneously.First adjust main transformer tap gear to reduce main transformer low-pressure side voltage, treat that voltage return is in normal range (NR), then in regulation station, inlet wire side is idle.If now main transformer high-pressure side is idle fall back to normal range (NR), then proceed to step 4.1) control strategy; If now main transformer high-pressure side is idle still get over the upper limit, then suitably drop into reactive-load compensation equipment in station again.In if stood, voltage power-less regulating measure has been used up and the idle upper limit of still getting in main transformer high-pressure side, then consider the cooperation control of distribution network var compensation equipment.Inject the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point in suitable input power distribution network, ensure that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy as shown in Figure 6.
When main transformer runs on " 6 " region in Fig. 3, main transformer voltage and idle more lower limit simultaneously.First adjust main transformer tap gear to raise main transformer low-pressure side voltage, treat that voltage return is in normal range (NR), then in regulation station, inlet wire side is idle.If now main transformer high-pressure side is idle fall back to normal range (NR), then proceed to step 4.1) control strategy; If now main transformer high-pressure side is idle still get over lower limit, then suitably excise reactive-load compensation equipment in station again.In if stood, voltage power-less regulating measure has been used up and the idle lower limit of still getting in main transformer high-pressure side, then consider the cooperation control of distribution network var compensation equipment.Inject the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point in suitable excision power distribution network, ensure that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy as shown in Figure 6.
When main transformer runs on " 4 " region in Fig. 3, main transformer voltage gets over lower limit, and reactive power gets over the upper limit.First whether normal suitably reactive-load compensation equipment in input station, if now main transformer high-pressure side is idle fall back to normal range (NR), then detect main transformer low-pressure side voltage, if main transformer outgoing line side voltage still gets over lower limit, then suitably regulates main transformer tap gear that voltage is raised; If after dropping into the interior reactive-load compensation equipment in station, main transformer high-pressure side is idle still get over the upper limit, then in station, voltage power-less conditioning equipment cannot regulate again, considers the cooperation control of distribution network var compensation equipment.Inject the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point in suitable input power distribution network, ensure that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy as shown in Figure 7.
When main transformer runs on " 8 " region in Fig. 3, main transformer Over High-Limit Voltage, reactive power gets over lower limit.First suitably excise reactive-load compensation equipment in station, if now main transformer high-pressure side is idle fall back to normal range (NR), then whether normally detect main transformer low-pressure side voltage, if main transformer outgoing line side voltage still gets over the upper limit, then suitably regulate main transformer tap gear that voltage is reduced; If in excision station, after reactive-load compensation equipment, main transformer high-pressure side is idle still get over lower limit, then in station, voltage power-less conditioning equipment cannot regulate again, considers the cooperation control of distribution network var compensation equipment.Inject the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point in suitable excision power distribution network, ensure that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy as shown in Figure 7.
Step 4.4) for step 3.2) the control strategy taked of the situation of 4. planting.
In this situation, transformer station is discontented with the idle appraisal standards of afc voltage, and afc voltage appraisal standards are discontented with by power distribution network.The principle regulating and controlling to follow is, if all discontented idle check requirements of afc voltage of transformer station and distribution, then first by regulating voltage power-less equipment in transformer station to meet transforming plant voltage reactive check requirements, then by regulating distribution network var compensation equipment to meet distribution network voltage check requirements, if after above-mentioned adjustment, transformer station or power distribution network still do not meet check requirements, then carry out mutual cooperation control.
Be described in detail with the running status that transformer station's nine-zone diagram is different.Transformer station's nine-area control as shown in Figure 3.
When main transformer runs on " 1 " region in Fig. 3, and in distribution, distribution low-voltage side voltage is discontented with afc voltage check requirements.First main transformer tap gear is adjusted to reach the object of step-down, if now main transformer low-pressure side current path to normal range (NR), then proceeds to step 4.2) control strategy; If now main transformer low-pressure side voltage still gets over the upper limit, then suitably excise reactive-load compensation equipment in station.In if stood, voltage power-less regulating measure has been used up and the main transformer low-pressure side voltage still more upper limit, then regulate distribution network var compensation equipment on this basis.By formula Q aj-Need=Q a× α jcalculate the reactive power demand Q in each region in feeder line aj-Needif reactive-load compensation equipment has adjustment nargin in feeder line, then according to reactive power demand Q aj-Needinject the idle order descending to the sensitivity coefficient of minimum (the highest) distribution transforming voltage place voltage according to reactive-load compensation equipment position place in feeder line to drop into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If after above-mentioned adjustment, power distribution network and transformer station still all do not meet check requirements, then stop adjustment process.If after above-mentioned adjustment, power distribution network meets voltage check requirements and substation low-voltage side voltage still gets over the upper limit, then proceed to step 4.3) control strategy.Its concrete control strategy as shown in Figure 8.
When main transformer runs on " 5 " region in Fig. 3, and in distribution, distribution low-voltage side voltage is discontented with afc voltage check requirements.First main transformer tap gear is adjusted to reach the object of boosting, if now main transformer low-pressure side current path to normal range (NR), then proceeds to step 4.2) control strategy; If now main transformer low-pressure side voltage still gets over lower limit, then suitably drop into reactive-load compensation equipment in station.In if stood, voltage power-less regulating measure has been used up and main transformer low-pressure side voltage still more lower limit, then regulate distribution network var compensation equipment on this basis.By formula Q aj-Need=Q a× α jcalculate the reactive power demand Q in each region in feeder line aj-Needif reactive-load compensation equipment has adjustment nargin in feeder line, then according to reactive power demand Q aj-Needinject the idle order descending to the sensitivity coefficient of minimum (the highest) distribution transforming voltage place voltage according to reactive-load compensation equipment position place in feeder line to drop into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If after above-mentioned adjustment, power distribution network and transformer station still all do not meet check requirements, then stop adjustment process.If after above-mentioned adjustment, power distribution network meets voltage check requirements and substation low-voltage side voltage still gets over lower limit, then proceed to step 4.3) control strategy.Its concrete control strategy as shown in Figure 8.
When main transformer runs on " 3 " region in Fig. 3, and in distribution, distribution low-voltage side voltage is discontented with afc voltage check requirements.First suitably drop into reactive-load compensation equipment in station, if main transformer high-pressure side is idle after regulating fall back to normal range (NR), then proceed to step 4.2) control strategy.If Reactive-power control means have been used up and the idle upper limit of still getting in main transformer high-pressure side in transformer station, then on this basis distribution network var compensation equipment is regulated.By formula Q aj-Need=Q a× α jcalculate the reactive power demand Q in each region in feeder line aj-Needif reactive-load compensation equipment has adjustment nargin in feeder line, then according to reactive power demand Q aj-Needinject the idle order descending to the sensitivity coefficient of minimum (the highest) distribution transforming voltage place voltage according to reactive-load compensation equipment position place in feeder line to drop into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If after above-mentioned adjustment, power distribution network and transformer station still all do not meet check requirements, then stop adjustment process.If after above-mentioned adjustment, power distribution network meets check requirements and the idle still more upper limit in transformer station high-pressure side, then proceed to step 4.3) control strategy.Its concrete control strategy as shown in Figure 9.
When main transformer runs on " 7 " region in Fig. 3, and in distribution, distribution low-voltage side voltage is discontented with afc voltage check requirements.First suitably reactive-load compensation equipment in excision station, if main transformer high-pressure side is idle after regulating fall back to normal range (NR), then proceeds to step 4.2) control strategy.If Reactive-power control means have been used up and the idle lower limit of still getting in main transformer high-pressure side in transformer station, then on this basis distribution network var compensation equipment is regulated.By formula Q aj-Need=Q a× α jcalculate the reactive power demand Q in each region in feeder line aj-Needif reactive-load compensation equipment has adjustment nargin in feeder line, then according to reactive power demand Q aj-Needinject the idle order descending to the sensitivity coefficient of minimum (the highest) distribution transforming voltage place voltage according to reactive-load compensation equipment position place in feeder line to drop into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If after above-mentioned adjustment, power distribution network and transformer station still all do not meet check requirements, then stop adjustment process.If after above-mentioned adjustment, power distribution network meets check requirements and the idle still more lower limit in transformer station high-pressure side, then proceed to step 4.3) control strategy.Its concrete control strategy as shown in Figure 9.
When main transformer runs on " 2 " region in Fig. 3, and in distribution, distribution low-voltage side voltage is discontented with afc voltage check requirements.First adjust main transformer tap gear to reduce main transformer low-pressure side voltage, treat that voltage return is in normal range (NR), reactive-load compensation equipment in ability regulation station.If now main transformer high-pressure side is idle fall back to normal range (NR), then proceed to step 4.2) control strategy; If now main transformer high-pressure side is idle still get over the upper limit, then suitably drop into reactive-load compensation equipment in station again.If voltage power-less regulating measure has been used up and transformer station does not still meet check requirements in transformer station, then on this basis distribution network var compensation equipment is regulated.By formula Q aj-Need=Q a× α jcalculate the reactive power demand Q in each region in feeder line aj-Needif reactive-load compensation equipment has adjustment nargin in feeder line, then according to reactive power demand Q aj-Needinject the idle order descending to the sensitivity coefficient of minimum (the highest) distribution transforming voltage place voltage according to reactive-load compensation equipment position place in feeder line to drop into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If after above-mentioned adjustment, power distribution network and transformer station still all do not meet check requirements, then stop adjustment process.If after above-mentioned adjustment, power distribution network meets check requirements and transformer station does not still meet check requirements, then proceed to step 4.3) control strategy.Its concrete control strategy as shown in Figure 10.
When main transformer runs on " 6 " region in Fig. 3, and in distribution, distribution low-voltage side voltage is discontented with afc voltage check requirements.First adjust main transformer tap gear to raise main transformer low-pressure side voltage, treat that voltage return is in normal range (NR), reactive-load compensation equipment in ability regulation station.If now main transformer high-pressure side is idle fall back to normal range (NR), then proceed to step 4.2) control strategy; If now main transformer high-pressure side is idle still get over lower limit, then suitably excise reactive-load compensation equipment in station again.If voltage power-less regulating measure has been used up and transformer station does not still meet check requirements in transformer station, then on this basis distribution network var compensation equipment is regulated.By formula Q aj-Need=Q a× α jcalculate the reactive power demand Q in each region in feeder line aj-Needif reactive-load compensation equipment has adjustment nargin in feeder line, then according to reactive power demand Q aj-Needinject the idle order descending to the sensitivity coefficient of minimum (the highest) distribution transforming voltage place voltage according to reactive-load compensation equipment position place in feeder line to drop into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If after above-mentioned adjustment, power distribution network and transformer station still all do not meet check requirements, then stop adjustment process.If after above-mentioned adjustment, power distribution network meets check requirements and transformer station does not still meet check requirements, then proceed to step 4.3) control strategy.Its concrete control strategy as shown in Figure 10.
When main transformer runs on " 4 " region in Fig. 3, and in distribution, distribution low-voltage side voltage is discontented with afc voltage check requirements.First suitably reactive-load compensation equipment in station is dropped into, if now main transformer high-pressure side is idle fall back to normal range (NR), whether normally then detect main transformer low-pressure side voltage, if main transformer outgoing line side voltage still gets over lower limit, then regulate main transformer tap gear that voltage is raised, if transformer station meets voltage power-less check requirements after overregulating, then proceed to step 4.2) control strategy; If after dropping into the interior reactive-load compensation equipment in station, main transformer high-pressure side is idle still get over the upper limit, then in transformer station, voltage power-less conditioning equipment cannot regulate again.If voltage power-less regulating measure has been used up and transformer station does not still meet check requirements in transformer station, then on this basis distribution network var compensation equipment is regulated.By formula Q aj-Need=Q a× α jcalculate the reactive power demand Q in each region in feeder line aj-Needif reactive-load compensation equipment has adjustment nargin in feeder line, then according to reactive power demand Q aj-Needinject the idle order descending to the sensitivity coefficient of minimum (the highest) distribution transforming voltage place voltage according to reactive-load compensation equipment position place in feeder line to drop into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If after above-mentioned adjustment, power distribution network and transformer station still all do not meet check requirements, then stop adjustment process; If after above-mentioned adjustment, power distribution network meets check requirements and transformer station does not still meet check requirements, then proceed to step 4.3) control strategy.Its concrete control strategy as shown in figure 11.
When main transformer runs on " 8 " region in Fig. 3, and in distribution, distribution low-voltage side voltage is discontented with afc voltage check requirements.First suitably reactive-load compensation equipment in excision station, if now main transformer high-pressure side is idle fall back to normal range (NR), whether normally then detect main transformer low-pressure side voltage, if main transformer outgoing line side voltage still gets over the upper limit, then regulate main transformer tap gear that voltage is reduced, if transformer station meets voltage power-less check requirements after overregulating, then proceed to step 4.2) control strategy; If in excision station, after reactive-load compensation equipment, main transformer high-pressure side is idle still get over lower limit, then in transformer station, voltage power-less conditioning equipment cannot regulate again.If voltage power-less regulating measure has been used up and transformer station does not still meet check requirements in transformer station, then on this basis distribution network var compensation equipment is regulated.By formula Q aj-Need=Q a× α jcalculate the reactive power demand Q in each region in feeder line aj-Needif reactive-load compensation equipment has adjustment nargin in feeder line, then according to reactive power demand Q aj-Needinject the idle order descending to the sensitivity coefficient of minimum (the highest) distribution transforming voltage place voltage according to reactive-load compensation equipment position place in feeder line to drop into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If after above-mentioned adjustment, power distribution network and transformer station still all do not meet check requirements, then stop adjustment process; If after above-mentioned adjustment, power distribution network meets check requirements and transformer station does not still meet check requirements, then proceed to step 4.3) control strategy.Its concrete control strategy as shown in figure 11.
Embodiment
The transformer station in China X area and its subordinate's power distribution network carry out station, and to join the concrete steps of cooperation control as follows:
Step 1), determine that the cooperation control moment is joined at station according to daily load curve.
First adopt load curve fusion method to carry out segmentation to transformer station's outgoing line side reactive power daily load curve, be restricted to x=10 time according to transforming plant main transformer tap gear action frequency every day, daily load curve be divided into x=10 section.If the equivalent reactive power of m period system is Q m, then adjacent time interval m and m+1 load variations amount absolute value are:
ΔQ m＝|Q m-Q m+1|；
Wherein: Δ Q mfor adjacent time interval m and m+1 load or burden without work variable quantity absolute value, Q mbe the equivalent reactive power of m period system, Q m+1it is the equivalent reactive power of m+1 period system.
Find Δ Q mq time minimum mthe corresponding period, period m and m+1 is merged into a new period m, with the load level of former period m initial time characterize merge after the load level of new period.Repeat merging process, until remaining fixed number reaches expected numbers x=10.As shown in figure 12, in figure, daily load curve 1 is original daily load curve to the segmentation result of daily load curve, and in figure, daily load curve 2 is the daily load curve after merging.After having merged, join the cooperation control moment using the initial time of day part as station.It is t=[0,4,7,11,12,17,18,19,21,22] point that the cooperation control moment is joined at station.
Step 2), the state information of Real-time Collection transformer station and subordinate's power distribution network thereof.
Step 1) complete after, according to the control moment determined, station is carried out to transformer station and subordinate's power distribution network thereof and joins cooperation control, carry out station for the t=17 point moment and join cooperation control.By wide area measurement information system, the voltage power-less state information of equipment component in Real-time Collection transformer station and subordinate's power distribution network thereof, comprises power distribution network all 10kV branch lines head end and the distribution transforming of end place and is provided with the low-pressure side information of voltage U of low-pressure reactive compensation equipment place distribution transforming zi(i=1,2 ..., 54), the meritorious P at feeder line critical point g=4.79MW, idle Q g=1.55Mvar information, main transformer low-pressure side and on high-tension side voltage U l=10.35kV and U h=109.56kV, active-power P l=23.20MW and P h=23.28MW, reactive power Q l=5.46Mvar and Q h=7.30Mvar; And the switching state information of control appliance, comprise the input capacity Qc of distribution low-voltage side reactive power compensator pt(t=1,2 ..., 23), the input capacity Qc of reactive power compensation system device lr(r=1,2), main transformer tap gear D=10, the input capacity Qc of Reactive Power Compensation Eqyuipment in Substation t=600kvar.
Step 3), judge whether transformer station and subordinate's power distribution network thereof meet voltage power-less appraisal standards.
Step 2) complete after, according to step 2) the voltage power-less status data of Real-time Collection, judge whether transformer station and subordinate's power distribution network thereof meet respective voltage power-less appraisal standards, and concrete steps are as follows:
Step 3.1), input transformer station and the voltage power-less appraisal standards of power distribution network.
Input transformer station outgoing line side voltage appraisal standards U t1~ U t2(U t1=10.0kV, U t2=10.7kV); Input transforming plant lead-in side power factor standard comprise peak hours power factor appraisal standards power factor appraisal standards during low ebb load input distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2(U p1=198V, U p2=235.4V).
Step 3.2) judge whether transformer station and power distribution network meet voltage power-less appraisal standards.
Step 3.1) complete after, the voltage power-less state information according to transformer station and power distribution network judges whether it meets respective appraisal standards, is divided into following four kinds of situations:
The 1. to plant situation be that transformer station meets voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage U lmeet transformer station outgoing line side voltage appraisal standards U t1~ U t2(U t1=10.0kV, U t2=10.7kV), and main transformer high-pressure side power factor meet transforming plant lead-in side power factor standard power distribution network meets voltage appraisal standards, i.e. power distribution network all 10kV branch lines head end and the distribution transforming of end place and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transforming zi(i=1,2 ..., 54) and meet distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2(U p1=198V, U p2=235.4V) qualification rate reach more than 90%.
The 2. to plant situation be that transformer station meets voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage U lmeet transformer station outgoing line side voltage appraisal standards U t1~ U t2(U t1=10.0kV, U t2=10.7kV), and main transformer high-pressure side power factor meet transforming plant lead-in side power factor standard afc voltage appraisal standards are discontented with by power distribution network, i.e. power distribution network all 10kV branch lines head end and the distribution transforming of end place and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transforming zi(i=1,2 ..., 54) and meet distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2(U p1=198V, U p2=235.4V) qualification rate lower than 90%.
The 3. to plant situation be that transformer station is discontented with the idle appraisal standards of afc voltage, i.e. main transformer low-pressure side voltage U ldo not meet transformer station outgoing line side voltage appraisal standards U t1~ U t2(U t1=10.0kV, U t2=10.7kV), or main transformer high-pressure side power factor do not meet transforming plant lead-in side power factor standard power distribution network meets voltage appraisal standards, i.e. power distribution network all 10kV branch lines head end and the distribution transforming of end place and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transforming zi(i=1,2 ..., 54) and meet distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2(U p1=198V, U p2=235.4V) qualification rate reach more than 90%.
The 4. to plant situation be that transformer station is discontented with the idle appraisal standards of afc voltage, i.e. main transformer low-pressure side voltage U ldo not meet transformer station outgoing line side voltage appraisal standards U t1~ U t2(U t1=10.0kV, U t2=10.7kV), or main transformer high-pressure side power factor do not meet transforming plant lead-in side power factor standard afc voltage appraisal standards are discontented with by power distribution network, i.e. power distribution network all 10kV branch lines head end and the distribution transforming of end place and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transforming zi(i=1,2 ..., 54) and meet distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2(U p1=198V, U p2=235.4V) qualification rate lower than 90%.
Judged result: transformer station meets voltage power-less appraisal standards (U l=10.35kV meets at U t1~ U t2between, meet between), afc voltage appraisal standards (U is discontented with by power distribution network zi(i=1,2 ..., 54) meet at U p1~ U p2rate of qualified voltage be 59.26%, lower than 90%), belong to and 2. plant situation.
Step 4), take corresponding station to join coordination control strategy according to examination assessment result.
Step 3) complete after, 2. according to transformer station and its subordinate's power distribution network examination assessment result (step 3.2) separately the plant situation) take corresponding station to join the control strategy of coordination control strategy (step 4.2)).First according to the flow state under history typical load level, power distribution network is carried out subregion, follow with reactive power compensator on bar be regional center, feeder line is divided into j (=3) individual region by the reactive power minimum principle that flows between region, is calculated the reactive requirement proportionality coefficient α in each region in feeder line by the flow state under typical load level j(α 1=0.509, α 2=0.301, α 3=0.190).Concrete control strategy is as follows:
In this situation, transformer station meets voltage power-less appraisal standards, and afc voltage appraisal standards are discontented with by power distribution network.
First according to formula Q aj-Need=Q a× α jcalculate the reactive power demand Q in each region in feeder line aj-Need, result of calculation is: Q a=2150kvar, Q a1-Need=1094kvar, Q a2-Need=647kvar, Q a3-Need=409kvar.
If reactive-load compensation equipment has adjustment nargin in feeder line, then calculate low-pressure reactive compensation equipment position place in feeder line according to historical trend information and inject the idle sensitivity coefficient to actual measurement distribution transforming place voltage: S qU=Δ U ti/ Δ Q t;
Wherein, S qUfor i max× t maxscale (i=1,2 ..., 54; T=1,2 ..., 23) injection idle to voltage sensibility matrix, Δ Q t(t=1,2 ..., 23) and be single pool-size of distribution low-voltage side reactive power compensator, Δ U ti(i=1,2 ..., 54) and for dropping into Δ Q tthe voltage change of rear actual measurement distribution transforming place.
By the voltage U of actual measurement distribution transforming zi(i=1,2 ..., 54), find out-of-limit U zithe distribution transforming that middle minimum value (or maximum) is corresponding, according to the reactive power demand Q in each region aj-Need(j=1,2,3), inject the idle sensitivity coefficient S to this distribution transforming place voltage according to low-pressure reactive compensation equipment place qUreactive-load compensation equipment in distribution that descending order drops into (or excision), farthest to meet the voltage check requirements of distribution low-voltage side.Ensure that in transformer station, voltage power-less meets its check requirements all the time simultaneously.
Drop in distribution after reactive-load compensation equipment, result of calculation is: U l=10.39kV, u zi(i=1,2 ..., 54) and meet U p1~ U p2rate of qualified voltage be 79.63%.
After distribution network var compensation equipment carries out switching, if the low-pressure side voltage of a large amount of distribution transforming still gets over lower limit, then suitably raise main transformer tap gear and make main transformer low-pressure side voltage U lraise; If the low-pressure side Over High-Limit Voltage of a large amount of distribution transforming, then suitably lower main transformer tap gear and make main transformer low-pressure side voltage U lreduce.All the time to ensure in transformer station's adjustment process that main transformer voltage power-less meets check requirements.
Because the low-pressure side voltage of distribution transforming a large amount of in now distribution gets over lower limit, main transformer tap gear is raised the result of calculation after 2 grades is: U l=10.67kV, u zi(i=1,2 ..., 54) and meet U p1~ U p2rate of qualified voltage be 94.44%.Now transformer station and its subordinate's power distribution network all meet voltage power-less check requirements, and station is joined cooperation control and stopped.
Test effect
Following simulation example is designed to embodiment, the validity of checking the inventive method.
Carry out after station joins cooperation control to the typical load day in embodiment in 17 moment, its original running status with control after running status comparing result as shown in the table:
Table 1: China X area typical load day, cooperation control effect was joined at 17 moment stations
To carrying out the typical load day in embodiment after station joins cooperation control, its original running status with control after running status comparing result as shown in the table:
Table 2: cooperation control effect is joined at typical load day station, China X area
From experimental result:
The present invention can improve transformer station's outgoing line side rate of qualified voltage and inlet wire side power factor qualification rate largely, enables transformer station meet its voltage power-less check requirements as far as possible; The rate of qualified voltage of distribution low-voltage side in power distribution network can be improved largely, and significantly can reduce the line loss of power distribution network, bring huge economic benefit and social benefit; Consider action frequency restriction every day of main transformer tap gear in transformer station, can ensure to meet the voltage power-less check requirements of transformer station and its subordinate's power distribution network in every day in action frequency restriction as far as possible;
The inventive method only gathers the voltage power-less state information of equipment component in power distribution network, just by sensitivity calculations can judge the running status of transformer station and power distribution network exactly and control accordingly, the data volume of Real-time Collection and computing is little, computational speed is fast, installation cost and the operation expense of collection and control appliance are less, practical, easy to utilize.
Above-described embodiment is only used to the present invention is described, and is not used as limitation of the invention.As long as according to technical spirit of the present invention, change above-described embodiment, modification etc. all will be dropped in the scope of claim of the present invention.

Claims (10)

1. the voltage power-less distributed control method of coordination is joined at a station, it is characterized in that, first, by the voltage power-less state information of reactive-load compensation equipment in wide area measurement information system Real-time Collection transformer station and subordinate's power distribution network thereof, control the switching state information of reactive-load compensation equipment; Then, judge whether transformer station and power distribution network meet the check requirements preset respectively according to the voltage power-less state information of transformer station and power distribution network; Finally, perform the station of presetting according to the examination assessment result of transformer station and power distribution network and join coordination control strategy.
2. the voltage power-less distributed control method of coordination is joined at station according to claim 1, it is characterized in that, the examination assessment result of transformer station and power distribution network comprises:
Transformer station meets voltage power-less appraisal standards, and power distribution network meets voltage appraisal standards;
Transformer station meets voltage power-less appraisal standards, and afc voltage appraisal standards are discontented with by power distribution network;
Transformer station is discontented with the idle appraisal standards of afc voltage, and power distribution network meets voltage appraisal standards;
Transformer station is discontented with the idle appraisal standards of afc voltage, and afc voltage appraisal standards are discontented with by power distribution network.
3. the voltage power-less distributed control method of coordination is joined at station according to claim 2, it is characterized in that, when transformer station is discontented with the idle appraisal standards of afc voltage, when afc voltage appraisal standards are discontented with by power distribution network, the principle regulating and controlling to follow is: first by regulating voltage power-less equipment in transformer station to meet transforming plant voltage reactive check requirements, then by regulating reactive-load compensation equipment in power distribution network to meet distribution network voltage check requirements, if transformer station or power distribution network still do not meet check requirements, then carry out mutual cooperation control.
4. the voltage power-less distributed control method of coordination is joined at station according to claim 3, it is characterized in that, first, meets transforming plant voltage reactive check requirements by regulating voltage power-less equipment in transformer station; Then, perform transformer station and meet voltage power-less appraisal standards, control strategy during afc voltage appraisal standards is discontented with by power distribution network; If voltage power-less equipment does not meet transforming plant voltage reactive check requirements again in transformer station, then calculate the reactive power demand in each region in feeder line, if reactive-load compensation equipment has adjustment nargin in feeder line, then according to reactive power demand, inject the idle order descending to the sensitivity coefficient of minimum or the highest distribution transforming voltage place voltage according to reactive power compensator position place in feeder line to drop into or excise, meet the voltage check requirements of distribution low-voltage side; If after above-mentioned adjustment, power distribution network meets voltage appraisal standards, and transformer station is discontented with the idle appraisal standards of afc voltage, then perform power distribution network and meet voltage appraisal standards, transformer station is discontented with the control strategy of the idle appraisal standards of afc voltage, otherwise, stop adjustment process.
5. the voltage power-less distributed control method of coordination is joined at station according to claim 4, it is characterized in that, when transformer station meets voltage power-less appraisal standards, when afc voltage appraisal standards are discontented with by power distribution network, first calculates the reactive power demand in each region in feeder line;
If reactive-load compensation equipment has adjustment nargin in feeder line, then according to historical trend information, calculate low-pressure reactive compensation equipment position place in feeder line and inject the idle sensitivity coefficient to actual measurement distribution transforming place voltage, real-time detection power distribution network all 10kV branch lines head end and the distribution transforming of end place and the low-pressure side voltage of low-voltage reactive compensator capable place distribution transforming is installed, find minimum value in the low-pressure side voltage of out-of-limit distribution transforming or distribution transforming corresponding to maximum, according to the reactive power demand in region each in feeder line, the idle sensitivity coefficient to this distribution transforming place voltage is injected according to low-pressure reactive compensation equipment place, descending order drops into, or ascending order is excised, in distribution, reactive-load compensation equipment meets the voltage check requirements of distribution low-voltage side, and in transformer station, voltage power-less meets check requirements all the time simultaneously.
6. the voltage power-less distributed control method of coordination is joined at station according to claim 4, it is characterized in that, when transformer station is discontented with the idle appraisal standards of afc voltage, when power distribution network meets voltage appraisal standards, the situation that the main transformer outgoing line side voltage of transformer station is idle with inlet wire side in station and control strategy as follows:
When main transformer outgoing line side Over High-Limit Voltage or more lower limit, and in station, inlet wire side is idle without time out-of-limit, first adjusts main transformer outgoing line side voltage to normal range (NR), otherwise, excision or drop into the interior reactive-load compensation equipment in station; In if stood, voltage power-less regulating measure is used up and main transformer outgoing line side the voltage still more upper limit or more lower limit, then regulate reactive power compensator in power distribution network, excision or the interior reactive power compensator injecting the idle larger position of sensitivity to main transformer low-pressure side voltage of input distribution, ensure that power distribution network meets voltage check requirements simultaneously;
When main transformer outgoing line side voltage is without out-of-limit, and in station the idle more upper limit in inlet wire side or more lower in limited time, first drop into or excise the reactive power compensation of reactive-load compensation equipment in station, regulate main transformer high-pressure side idle to normal range (NR), in if stood, voltage power-less regulating measure has been used up and the idle upper limit of still getting in main transformer high-pressure side, then regulate reactive power compensator in power distribution network, drop into or inject in excision distribution the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point, ensure that power distribution network meets voltage check requirements simultaneously;
When the idle all more upper limit in inlet wire side or more lower limit in main transformer outgoing line side voltage with station, first main transformer outgoing line side voltage is adjusted to normal range (NR), in regulation station, inlet wire side is idle again, if main transformer high-pressure side the is idle still more upper limit or more lower limit, then drop into again or reactive-load compensation equipment in excision station, in if stood, voltage power-less regulating measure is used up and main transformer the high-pressure side idle still more upper limit or more lower limit, then regulate reactive power compensator in power distribution network, drop into or inject in excision distribution the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point, ensure that power distribution network meets voltage check requirements simultaneously,
When main transformer outgoing line side voltage gets over lower limit, the idle more upper limit in inlet wire side in standing, or main transformer outgoing line side Over High-Limit Voltage, in standing inlet wire side idle more lower in limited time, first drop into or excise the reactive power compensation of reactive-load compensation equipment in station, regulate main transformer high-pressure side idle to normal range (NR), whether detection main transformer low-pressure side voltage is normal, if main transformer outgoing line side voltage still more lower limit or the more upper limit, then adjust main transformer outgoing line side voltage to normal range (NR); If after dropping into or excise the interior reactive-load compensation equipment in station, main transformer high-pressure side the is idle still more upper limit or more lower limit, in standing, voltage power-less conditioning equipment cannot regulate again, then adjust distribution network var compensation device, drop into or inject in excision power distribution network the reactive power compensator of the idle larger position of the sensitivity idle to feeder line critical point, ensure that power distribution network meets voltage check requirements simultaneously.
7. the voltage power-less distributed control method of coordination is joined at station according to claim 4, it is characterized in that, when transformer station meets voltage power-less appraisal standards, when power distribution network meets voltage appraisal standards, first the reactive power demand in each region in feeder line is calculated, then inject the idle sensitivity coefficient to network loss according to reactive power compensator position place in feeder line, descending order drops into, or ascending order is excised; Under the prerequisite of voltage power-less check requirements meeting transformer station and power distribution network, meet the reactive power demand in each region in feeder line simultaneously, reduce distribution network loss.
8. the voltage power-less distributed control method of coordination is joined at station according to claim 1, it is characterized in that, before gathering the voltage power-less state information of reactive-load compensation equipment in transformer station and subordinate's power distribution network thereof, determine that the cooperation control moment is joined at station according to daily load curve, be specially:
First adopt load curve fusion method to carry out segmentation to transformer station's outgoing line side reactive power daily load curve, be restricted to x time according to transforming plant main transformer tap gear action frequency every day, daily load curve be divided into x section; Then the equivalent reactive power of m period system is Q m, then adjacent time interval m and m+1 load variations amount absolute value are:
ΔQ m＝|Q m-Q m+1|；
Wherein, Δ Q mfor adjacent time interval m and m+1 load or burden without work variable quantity absolute value, Q mbe the equivalent reactive power of m period system, Q m+1it is the equivalent reactive power of m+1 period system;
By Δ Q mq time minimum mcorresponding period m and m+1 merges into a new period m, characterizes the load level merging rear new period m with the load level of former period m initial time;
Repeat merging process, until remaining fixed number reaches expected numbers x, after having merged, join the cooperation control moment using the initial time of each new period as station.
9. the voltage power-less distributed control method of coordination is joined at station according to claim 8, it is characterized in that, joins the cooperation control moment carry out station to transformer station and subordinate's power distribution network thereof and join cooperation control according to station; By wide area measurement information system, the voltage power-less state information of equipment component in Real-time Collection transformer station and subordinate's power distribution network thereof, comprising:
Power distribution network all 10kV branch lines head end and the distribution transforming of end place and the low-pressure side information of voltage U of low-voltage reactive compensator capable place distribution transforming is installed zi;
The meritorious P at feeder line critical point g, idle Q ginformation;
Main transformer low-pressure side and on high-tension side voltage U land U h, active-power P land P h, reactive power Q land Q h;
The switching state information of control appliance, comprises the input capacity Qc of distribution low-voltage side reactive power compensator pt, the input capacity Qc of reactive power compensation system device lr, main transformer tap gear D, the input capacity Qc of Reactive Power Compensation Eqyuipment in Substation t.
10. the voltage power-less distributed control method of coordination is joined at station according to claim 9, it is characterized in that, judges whether transformer station and subordinate's power distribution network thereof meet respective voltage power-less appraisal standards, and concrete steps are as follows:
1) the voltage power-less appraisal standards of transformer station and power distribution network are inputted:
Input transformer station outgoing line side voltage appraisal standards U t1~ U t2; Input transforming plant lead-in side power factor standard comprise peak hours power factor appraisal standards power factor appraisal standards during low ebb load input distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2;
2) judge whether transformer station and power distribution network meet voltage power-less appraisal standards:
Whether transformer station meets voltage power-less appraisal standards, is specially: main transformer low-pressure side voltage U lwhether meet transformer station outgoing line side voltage appraisal standards U t1~ U t2, and main transformer high-pressure side power factor whether meet transforming plant lead-in side power factor standard
Whether power distribution network meets voltage appraisal standards, is specially: power distribution network all 10kV branch lines head end and the distribution transforming of end place and be provided with the low-pressure side voltage U of low-voltage reactive compensator capable place distribution transforming ziwhether meet distribution low-voltage side 220V single phase power supply voltage appraisal standards U p1~ U p2qualification rate reach more than 90%.
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