CN106329548A - High-voltage power distribution network reactive power control method based on gateway power factor linear constraint - Google Patents

High-voltage power distribution network reactive power control method based on gateway power factor linear constraint Download PDF

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CN106329548A
CN106329548A CN201610899759.7A CN201610899759A CN106329548A CN 106329548 A CN106329548 A CN 106329548A CN 201610899759 A CN201610899759 A CN 201610899759A CN 106329548 A CN106329548 A CN 106329548A
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network
power
regulation
power factor
reactive
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CN106329548B (en
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胡鑫
张勇军
刘斯亮
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South China University of Technology SCUT
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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

Abstract

The invention provides a high-voltage power distribution network reactive power control method based on gateway power factor linear constraint in order to solve the problem that due to complex topological condition, a high-voltage power distribution network cannot achieve reactive layered on-spot balance. The method includes the specific steps that firstly, network structure parameters are collected, network operation parameters are read, network initial power flow is calculated, and target adjustment parameters are determined; secondly, by means of power factor adjustment targets at high-voltage gateways of 110 kV and 220 kV substations, switching of a substation lower-side compensation device is conducted, and accordingly on-spot reactive balance adjustment of the 110 kV substation and global reactive voltage adjustment of the 220 kV substation are conducted; finally, dynamic reactive adjustment is conducted on nodes which still cannot meet voltage safety constraint requirement, so that it is guaranteed that voltage of all nodes in a network run in a safe and economical range, and a final compensation device switching scheme is determined.

Description

High voltage distribution network powerless control method based on critical point power factor linear restriction
Technical field
The present invention relates to the voltage power-less control method of power system, particularly to based on critical point power factor linear restriction High voltage distribution network powerless control method.
Background technology
At present system for distribution network of power exists that automatization level is relatively low, data are huge, the feature of topological complexity, causes system Reactive voltage regulating power is vertical often cannot meet " layering " in-situ balancing demand idle in network, the voltage matter thus brought Amount problem is the most prominent with economic operation problem.
For rack feature and the operation characteristic of current high voltage distribution network, can there are convergence difficulties or receipts in modern optimization algorithm Hold back the some problem such as unreasonable.
For current high voltage distribution network idle planning present situation, the present invention based on reactive power flow economic allocation principle with idle point Layer local compensation principle, carries out voltage & var control to high voltage distribution network, and the method is by high voltage distribution network two-stage critical point merit The regulation of adjusting of rate factor, makes reactive power flow in network tend to reasonable, and the method is meeting idle in-situ balancing basis as far as possible On can effectively improve the quality of voltage of the whole network and damage effect with fall.
Summary of the invention
It is an object of the invention to solve high voltage distribution network voltage power-less regulation problem, make electrical network ensure that voltage is qualified Economical operation under premise.
The present invention proposes a kind of high voltage distribution network powerless control method based on critical point power factor linear restriction, including with Lower step:
(1) gather network architecture parameters, read network operational parameter, calculate initial trend.
(2) according to the initial trend of network, and combine area load or burden without work characteristic and voltage power-less regulating power, determine target Regulation parameter:Vmin；Vmax。
(3) regulation of reactive balance on the spot of 110kV transformer station is carried out.Pass throughControl 110kV transformer station step-down side The switching of compensation device, regulation calculates network trend after terminating, obtains the φ of degree without the distribution of work of 110kV circuit head endcp。
(4) the Global regulation of 220kV transformer station is carried out.In conjunction with regulation result for the first time, pass throughDetermine The switching of 220kV transformer station step-down side compensation device.Regulation calculates network trend after terminating again.
(5) twice regulation result of comprehensive analysis, increases dynamic for still failing to meet the node of voltage security constraint further State Reactive-power control equipment, power flow solutions of adjusting, determine final compensation device switching scheme, terminate reactive-load compensation regulation.
Further, the target regulation parameter described in step (2): Vmin, VmaxRefer respectively to the minimum and maximum permissible value of power factor at 110kV transformer station high pressure critical point；220kV The regulation setting valve of power factor and three electric pressures of whole high voltage distribution network at transformer station's high pressure critical point (110kV, 35kV, 10kV) regulation voltage limits.More than regulation parameter defines in terms of voltage-regulation means and target two, and it takes Value can pass through local operation of power networks personnel with regard to its high voltage distribution network present situation situation (such as network topology feature, load or burden without work characteristic, nothing Merit voltage present situation, power supply zone type etc.) it is customized.
Further, the φ of degree without the distribution of work of the 110kV circuit head end described in step (3)cpRefer to 220kV transformer station presses The ratio of the reactive power exchange amount of bus outlet and the load or burden without work of now 110kV transformer station, such as formula (1):
φcp=Qpi/QTi (1)
Further, the power factor regulation target at 110kV transformer station high pressure critical pointObtained by formula (2):
Wherein αjFor 110kV transformer station load factor.
Further, the power factor regulation target at 220kV transformer station high pressure critical pointObtained by formula (3):
Further, step (1) gathered network architecture parameters includes network topology structure；Transformator, wire, idle benefit Repaying device model and parameter, network operational parameter includes section load value；Operating load natural power factor；Monitoring node runs Voltage；Compensation device input amount, and it is initially existing with network of adjusting to carry out the initial Load flow calculation of network by Newton-Raphson approach Shape.
Compared with prior art, the beneficial effects of the present invention is:
(1) it is effectively improved high voltage distribution network voltage regulation capability by the collaborative compensation of two-stage reactive apparatus, it is achieved The regulation target of high voltage distribution network idle " layering " in-situ balancing.
(2) compensate for convergence difficulties or convergence point that modern optimization algorithm occurs when in the face of complex network structures unreasonable Etc. problem, to guarantee that in network, all node voltages operate in safety, economic scope.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of high voltage distribution network powerless control method based on critical point power factor linear restriction.
Fig. 2 is high voltage power distribution rack typical branch schematic diagram.
Fig. 3 is certain actual high-voltage distribution network structure topological structure schematic diagram.
Detailed description of the invention
It is embodied as being described further to the present invention below in conjunction with accompanying drawing and example, but the enforcement of the present invention and protection It is not limited to this.
Fig. 1 illustrates the idiographic flow of high voltage distribution network powerless control method based on critical point power factor linear restriction, Including following regulating step:
(1) gather network architecture parameters, read network operational parameter, calculate initial trend.
(2) according to the initial trend of network, and combine area load or burden without work characteristic and voltage power-less regulating power, determine target Regulation parameter:Vmin, Vmax。
(3) regulation of reactive balance on the spot of 110kV transformer station is carried out.Pass throughControl 110kV transformer station step-down side The switching of compensation device, regulation calculates network trend after terminating, obtains the φ of degree without the distribution of work of 110kV circuit head endcp。
Power factor regulation target at 110kV transformer station high pressure critical pointObtained by following formula:
High voltage power distribution rack typical branch schematic diagram as shown in Figure 2, the load side reactive balance on the spot through step (3) is adjusted After joint, this rack 110kV side load or burden without work is QTi, the reactive power exchange amount of 220kV transformer station medium voltage side bus outlet is Qpi, Thus calculate the φ of degree without the distribution of work of 110kV circuit head endcp=Qpi/QTi, and in this, as step (4) Global The setting valve of regulation.
(4) the Global regulation of 220kV transformer station is carried out.In conjunction with regulation result for the first time, pass throughDetermine The switching of 220kV transformer station step-down side compensation device.Regulation calculates network trend after terminating again.
Power factor regulation target at 220kV transformer station high pressure critical pointObtained by following formula:
(5) twice regulation result of comprehensive analysis, increases dynamic for still failing to meet the node of voltage security constraint further State Reactive-power control equipment, power flow solutions of adjusting, determine final compensation device switching scheme, terminate reactive-load compensation regulation.
The following is a practical examples of the inventive method, this example is chosen some of Guangdong Power Grid and is comprised 110kV allusion quotation The electrical network of type grid structure emulates, and Fig. 3 is network frame topology structural representation.
(1) gathering network architecture parameters, this rack 220kV transformer station total power transformation capacity is 540MVA；The 110kV master having under its command Becoming totally 14, total power transformation capacity is 748MVA；This rack realizes full cable infiltration and the average radius of electricity supply of 110kV circuit is 20km, cable run model chooses XLPE-1*800, and a certain profile data read under this rack Smaller load mode (includes section Load value；Operating load natural power factor；Monitoring node working voltage；Compensation device input amount), calculate initial trend.
(2) according to the initial trend of network, and combine area load or burden without work characteristic and voltage power-less regulating power, determine target Regulation parameter such as table 1 below:
Table 1 regulates parameter and sets
(3) regulation of reactive balance on the spot of 110kV transformer station is carried out.Pass throughControl 110kV transformer station step-down side The switching of compensation device, in the profile data of collection, αjIn the range of 20%～30%, thusTakeRegulation calculates network trend after terminating again, obtains the φ of degree without the distribution of work of 110kV circuit head endcp= Qpi/QTi=-1.007.
(4) the Global regulation of 220kV transformer station is carried out.By the φ after regulation terminates for the first timecpValue is-1.007, DetermineTakeThereby determine that the switching of 220kV transformer station step-down side compensation device.Regulation terminate after again Secondary calculating network trend.
After (5) twice regulation terminate, B1Step-down side voltage of standing still in more upper limit state, increases dynamic reactive to this station and adjusts Joint equipment.Adjust power flow solutions, terminate reactive-load compensation regulation.Regulation result is as shown in the table
Table 2 simulation results on examples
Wherein, δh、δm、δlBe respectively in rack 110,35, tri-out-of-limit rates of electric pressure busbar voltage of 10kV, PlossFor Contrast the Network Loss Rate of initial trend active power loss.As shown in Table 2, after having regulated, it is qualified that busbar voltages at different levels are all pulled back to Scope.And on the basis of initial trend, play certain fall damage effect.
The power factor contrast of table 3 critical point
As shown in Table 3, after optimizing regulation terminates, this layer network and critical point, upper strata realize zero exchange of reactive power flow substantially, And the regulating effect of load power factor is the most ideal.Complete " certainly the disappearing from receiving " of this layer network var.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-described embodiment Limit, the amendment made under other any spirit without departing from the present invention and principle, modify, substitute, combine, simplify, all Should be the substitute mode of equivalence, within all should being included in protection scope of the present invention.

Claims (6)

1. high voltage distribution network powerless control method based on critical point power factor linear restriction, it is characterised in that include following step Rapid:
(1) gather network architecture parameters, read network operational parameter, calculate the initial trend of network；
(2) according to the initial trend of network, and combine area load or burden without work characteristic and voltage power-less regulating power, determine that target regulates Parameter:Vmin；Vmax；DescribedFor The minimum and maximum permissible value of power factor at 110kV transformer station high pressure critical point；For 220kV power transformation Stand the regulation setting valve of power factor at high pressure critical point；Vmin、VmaxFor three electric pressures 110kV of whole high voltage distribution network, The regulation voltage upper lower limit value of 35kV, 10kV；
(3) regulation of reactive balance on the spot of 110kV transformer station is carried out；Pass throughControl 110kV transformer station step-down side to compensate The switching of device, regulation calculates network trend after terminating, obtains the φ of degree without the distribution of work of 110kV circuit head endcp；For Power factor regulation target at 110kV transformer station high pressure critical point；
(4) the Global regulation of 220kV transformer station is carried out；In conjunction with regulation result for the first time, pass throughDetermine The switching of 220kV transformer station step-down side compensation device；Regulation calculates network trend after terminating again；Become for 220kV Power factor regulation target at high pressure critical point, power station；
(5) the aforementioned twice regulation result of comprehensive analysis, increases dynamic for still failing to meet the node of voltage security constraint further State Reactive-power control equipment, power flow solutions of adjusting, determine final compensation device switching scheme, terminate reactive-load compensation regulation.
High voltage distribution network powerless control method based on critical point power factor linear restriction the most according to claim 1, its It is characterised by: the target regulation parameter described in step (2) defines in terms of voltage-regulation means and target two, and target regulates The value of parameter is customized with regard to corresponding power distribution network present situation situation by local operation of power networks personnel, and power distribution network present situation situation includes Network topology feature, load or burden without work characteristic, reactive voltage present situation and power supply zone type.
High voltage distribution network powerless control method based on critical point power factor linear restriction the most according to claim 1, its It is characterised by: the φ of degree without the distribution of work of the 110kV circuit head end described in step (3)cpRefer to 220kV transformer station presses bus outlet The reactive power exchange amount at place and the ratio of the load or burden without work of now 110kV transformer station, such as formula (1):
φcp=Qpi/QTi (1)。
High voltage distribution network powerless control method based on critical point power factor linear restriction the most according to claim 1, its It is characterised by: step (3) is describedObtained by formula (2):
Wherein αjFor 110kV transformer station load factor.
High voltage distribution network powerless control method based on critical point power factor linear restriction the most according to claim 1, its It is characterised by: step (4) is describedObtained by formula (3):
High voltage distribution network powerless control method based on critical point power factor linear restriction the most according to claim 1, its It is characterised by: step (1) gathered network architecture parameters includes network topology structure；Transformator, wire, reactive power compensator type Number and parameter, network operational parameter includes section load value；Operating load natural power factor；Monitoring node working voltage；Mend Repay device input amount, and carry out the initial Load flow calculation of network with the initial present situation of network of adjusting by Newton-Raphson approach.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112800567A (en) * 2021-03-09 2021-05-14 广州汇通国信科技有限公司 Treatment method based on artificial neural network power data diagnosis

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CN102709918A (en) * 2012-05-21 2012-10-03 广东省电力调度中心 Reactive power control method of grid gateway based on automatic volume control (AVC) system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112800567A (en) * 2021-03-09 2021-05-14 广州汇通国信科技有限公司 Treatment method based on artificial neural network power data diagnosis

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