CN104538967A - Method for automatically forming plant and substation coordination group in automatic voltage control of plant and substation coordination - Google Patents

Method for automatically forming plant and substation coordination group in automatic voltage control of plant and substation coordination Download PDF

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Publication number
CN104538967A
CN104538967A CN201410685124.8A CN201410685124A CN104538967A CN 104538967 A CN104538967 A CN 104538967A CN 201410685124 A CN201410685124 A CN 201410685124A CN 104538967 A CN104538967 A CN 104538967A
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plant
plant stand
coordination group
substation
power plant
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CN104538967B (en
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郭文鑫
汤磊
向德军
卢建刚
徐展强
余志文
温柏坚
王志南
章平
郭庆来
王彬
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Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
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Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
Beijing King Star Hi Tech System Control 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

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

Abstract

The invention discloses a method for automatically forming a plant and substation coordination group in automatic voltage control of plant and substation coordination. The method comprises the step of comparing a ratio of reactive voltage sensitivity of reactive compensation equipment on a low-voltage side of a substation to a bus on a high-voltage side of a power plant to reactive voltage sensitivity of reactive power of a power generator in the power plant to the bus on the high-voltage side of the power plant with a preset threshold value to automatically form the plant and substation coordination group. The method for automatically forming the plant and substation coordination group in the automatic voltage control of the plant and substation coordination can automatically form the plant and substation coordination group in the automatic voltage control of the plant and substation coordination, adapts to various changes of a power grid structure and an operation mode, avoids various problems of a manually designated plant and substation coordination group, improves the safety and the economy of a power grid, and meets a requirement of field coordination control.

Description

A kind of plant stand coordinates the method automatically forming plant stand coordination group in automatism voltage control
Technical field
The present invention relates to electric power system automatism voltage control technical field, particularly relate to a kind of method that plant stand coordinates automatically to be formed in automatism voltage control plant stand coordination group.
Background technology
Automatism voltage control is (hereinafter referred to as AVC, Automatic Voltage Control) system realizes power grid security (raising voltage stability margin), economical (reduction via net loss), the important means that high-quality (raising rate of qualified voltage) is run, its control device includes continuous variable (generator reactive of Power Plant Side) and the discrete variable (electric capacity of transformer substation side, reactance, on-load transformer tap changer (OLTCs)), automatism voltage control is coordinated these control variables in essence exactly, thus meet the process of reasonable reactive voltage distribution.This relates to the cooperation control how realizing continuous variable and discrete variable.
Forefathers have carried out relevant research for how considering continuous variable in idle work optimization to discrete variable, typical method comprises resolves class algorithm and evolutional algorithm, the former is with Cheng Ying, Liu Mingbo etc. are at " the large-scale electrical power system idle work optimization containing discrete control variables " (Proceedings of the CSEE, 2002,22 (5): 54 ~ 60) method proposed is representative, the latter knows warbler with fourth, Wang Xifan, Chen Haoyong is at " a kind of combinational algorithm solving optimal load flow " (Proceedings of the CSEE, 2002,22 (12): 11-16) method proposed is representative.In recent years along with the development of automatism voltage control technology, mainly have employed the tertiary voltage control method based on soft sectoring in net, control centre of province.Sun Hongbin, Zhang Baiming etc. are in " the overall voltage optimization Control System Design based on soft sectoring " (Automation of Electric Systems, 2003,27 (8): 18-20) architecture of the tertiary voltage control of the middle employing of electrical network automatic voltage control system has been set forth, describe tertiary voltage control and secondary voltage control technology and implementation method in detail, under hierarchical voltage control pattern, the cooperation control of power plant and transformer station, realizes mainly through secondary voltage control.Guo Qing comes, Sun Hongbin etc. is in the coordination approach of continuous variable and discrete variable " in the automatism voltage control " (Automation of Electric Systems, 2008,32 (9): 65 ~ 78) propose the plant stand control method for coordinating based on real-time update coordination constraint, its main points are summarized as follows.
Consider a secondary voltage control region be made up of some power plant and transformer station, if V pand Q grepresent that high-pressure power plant side bus voltage vector generator reactive goes out force vector, V respectively sand Q crepresent respectively transformer substation side monitoring bus voltage vector and can the idle vector of switching capacitance reactance, in the hope of the sensitivity relation between above-mentioned idle vector and voltage vector, can be expressed as follows by matrix in block form form based on sensitivity calculations:
ΔV p ΔV s = C pg C pc C sg C sc ΔQ g ΔQ c - - - ( 1 )
If with that tertiary voltage control calculates the V provided respectively pand V svoltage setting value vector.After considering plant stand cooperation control, the coordinated secondary voltage control model (CSVC) finally determined is as follows:
min ΔQ g | | ( V p - V p ref ) + C pg ΔQ g | | 2 + | | ( V s - V s ref ) + C sg ΔQ g | | 2
s . t . V ‾ p ≤ V p + C pg ΔQ g ≤ V ‾ p V ‾ s ′ ≤ V s + C sg ΔQ g ≤ V ‾ s ′ Q ‾ g ≤ Q g + ΔQ g ≤ Q ‾ g - - - ( 2 )
In formula (2), constraint set for high-pressure power plant side bus runs limit value constraint, constraint set that substation bus bar voltage runs bound constraint a subset, be by the restriction range of the transformer station's module periodic refresh in Two-stage control.Visible, how the key that in secondary voltage control, plant stand is coordinated is determining coordination constraint but in the CSVC model of Two-stage control, which transformer station should participate in cooperation control? namely need to introduce which transformer substation voltage V in formula (2) scoordination constraint? in extensive net, provincial power network, a secondary voltage control region often comprises tens transformer stations, if be all increased in (2) by the coordination constraint of substation bus bar voltage whole in district, cause on the one hand that computation model is in large scale, calculated performance declines; If the feasible constraint that another aspect provides due to multiple transformer station is too strict, or conflicting, causes there is no feasible solution, cause whole region voltage to control unsuccessfully.
At present in engineering practice, in secondary voltage control, all adopt Manual definition's method to specify the transformer station participating in coordination, but when electric network composition and operational mode change, adopt the plant stand cooperation control quality of Manual definition's method significantly to decline.From published document, also do not have better method can solve this problem.
Summary of the invention
Primary and foremost purpose of the present invention is to provide a kind of plant stand to coordinate automatically to be formed in automatism voltage control the method for plant stand coordination group, the method can adapt to all kinds of changes of electric network composition and operational mode generation, automatic formation plant stand coordination group, thus ensure that normally solving of secondary partition control strategy, improve the fail safe of electrical network, economy, technical scheme of the present invention is as follows for achieving the above object:
A kind of plant stand coordinates the method automatically forming plant stand coordination group in automatism voltage control: by the ratio of substation low-voltage side reactive-load compensation equipment to the reactive voltage sensitivity of high-pressure power plant side bus and the idle reactive voltage sensitivity to high-pressure power plant side bus of power generator, compare with the threshold value preset, automatically form plant stand coordination group.
Preferably, the method automatically forming plant stand coordination group in plant stand coordination automatism voltage control comprises the following steps:
1), setting a Two-stage control partitioned set is Z i: Z i={ P 1, P 2..., P n, S 1, S 2..., S m, wherein P ifor power plant in subregion, S ifor transformer station in subregion;
2) the plant stand coordination group U that this subregion is corresponding, is set ias follows: U i={ P 1, P 2..., P n, S 1, S 2..., S k, meet k≤m, U i∈ Z i.Namely plant stand coordination group is the subset of Two-stage control subregion, its transformer station comprising power plant whole in subregion and participate in plant stand coordination.And by Two-stage control subregion Z iinterior all power plant P ijoin U iin;
3), to U iin power plant P i, calculate the idle reactive voltage sensitivity to high-pressure power plant side bus of power generator
4), to Z iin whole transformer station { S 1, S 2..., S m, to each S j, perform successively:
A) transformer station S is calculated jlow-pressure side reactive-load compensation equipment is to power plant P ithe reactive voltage sensitivity of high-voltage side bus
B) S is calculated jto P isensitivity and P ithe ratio of the sensitivity of self:
If c) judge to meet: r ji> ε, then by S jjoin plant stand coordination group U iin;
D) step is returned a), process Z imiddle next transformer station S j+1, until Z iin all transformer station all processed, wherein ε is the threshold value preset;
5), step 3 is returned), process U iin next power plant P j+1, until U iin all power plant all processed, Two-stage control subregion Z can be obtained icorresponding plant stand coordination group U i.
Preferably, described threshold value is 0.5.
Preferably, described threshold value is the tightness degree be coupled between power plant with transformer station.
Preferably, when described power plant and the tightness degree be coupled between transformer station are for being coupled completely, do not consider that plant stand is coordinated.
The method that plant stand provided by the invention coordinates automatically to be formed in automatism voltage control plant stand coordination group can realize automatically forming plant stand coordination group in plant stand coordination automatism voltage control, adapt to all kinds of changes of electric network composition and operational mode generation, avoid artificial all kinds of problems of specifying plant stand coordination group to exist, improve the fail safe of electrical network, economy, meet the needs that on-site coordination controls.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form inappropriate limitation of the present invention, in the accompanying drawings:
Fig. 1 is that plant stand used is coordinated automatically to form plant stand coordination group schematic diagram in voltage control.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
The present embodiment, for automatically to form plant stand coordination group to a Two-stage control subregion, comprises 2 power plant, 2 transformer station P respectively in this subregion 1, P 2, S 1, S 2.Wherein P 1power plant 500kV bus and S 1transformer station's high-voltage side bus is connected, and senior middle school of transformer station low-pressure side electric pressure is respectively 500kV, 220kV, 35kV, and have 1 transformer to run, capacity reactance device is arranged on 1 35kV bus, and load is connected on 1 220kV bus, another 500kV power plant P 2with 500kV transformer station S 2, be connected with other plant stands of this district by connecting line, according to electric connecting relation, by topology search, automatically form simplification Equivalent Model as shown in Figure 1.
Based on the simplification Equivalent Model formed, the present embodiment carries out according to following steps the real-time update that plant stand coordinates coordination constraint limit value in automatism voltage control.
1) setting a Two-stage control partitioned set is Z i: Z i={ P 1, P 2, S 1, S 2, wherein P 1, P 2for power plant in subregion, S 1, S 2for transformer station in subregion.
2) the plant stand coordination group U that this subregion is corresponding is set ias follows: U i={ P 1, P 2.Namely plant stand coordination group is the subset of Two-stage control subregion, its transformer station comprising power plant whole in subregion and participate in plant stand coordination.By Two-stage control subregion Z iinterior all power plant P ijoin U iin.
3) to U iin power plant P 1, calculate the idle reactive voltage sensitivity to high-pressure power plant side bus of power generator c 1.1 pg = 0.0348 .
4) to Z iin whole transformer station { S 1, S 2, to each S j, perform successively:
A) transformer station S is calculated 1low-pressure side reactive-load compensation equipment is to power plant P 1the reactive voltage sensitivity of high-voltage side bus c 1.1 pc = 0.0214 .
B) S is calculated 1to P 1sensitivity and P 1the ratio of the sensitivity of self:
r 11＝0.0214/0.0348＝0.61。
C) ε=0.5 is got, then: r 11> ε, (parameter ε is the threshold value preset, and is traditionally arranged to be 0.5, span 0< ε <1.0, and its physical significance is the tightness degree be coupled between power plant with transformer station.ε value is less, then plant stand coordination group U imiddle comprised transformer station S jmore, coordinate computation model with regard to more complicated; Otherwise, when ε value is comparatively large, plant stand coordination group U imiddle comprised transformer station S jless, coordinate computation model just fairly simple.When ε=1.0, U iin do not comprise transformer station, then do not consider in CSVC model that plant stand is coordinated), then by S 1join plant stand coordination group U imiddle U i={ P 1, P 2, S 1.
D) step is returned a), process Z imiddle next transformer station S 2, calculate transformer station S 2low-pressure side reactive-load compensation equipment is to power plant P 1the reactive voltage sensitivity of high-voltage side bus then r 21=0.0095/0.0348=0.27< ε (getting ε=0.5), does not meet, therefore S 2do not add plant stand coordination group U iin.
5), step 3 is returned), process U iin next power plant P 2, calculate the idle reactive voltage sensitivity to high-pressure power plant side bus of power generator transformer station S 2low-pressure side reactive-load compensation equipment is to power plant P 2the reactive voltage sensitivity of high-voltage side bus r 22=0.0105/0.0345=0.30 < ε (getting ε=0.5), does not meet, then S 2do not add plant stand coordination group U iin, so Two-stage control subregion Z icorresponding final plant stand coordination group is U i={ P 1, P 2, S 1.
The content of the application relates to the calculating controlling sensitivity.Sun Hongbin, Zhang Baiming, Xiang Niande is at " quasi-stationary Sensitivity Analysis Method " (Proceedings of the CSEE, in April, 1999 V19N4, pp.9-13) propose new sensitivity method in, different from the Sensitivity Analysis Method of the static state of routine, new sensitivity method considers the quasi-stationary physical responses of electric power system, take into account the total change before and after Systematical control between new and old stable state, effectively improve the precision of sensitivity analysis.The method, based on the PQ Decoupled Model of electric power system, when generator is provided with automatic voltage regulator (AVR), can think that this generator node is PV node; And when generator is equipped with automatic reactive power adjustment (AQR) or automatic power factor adjustment (APFR), can thinks that this generator node is identical with common load bus and be PQ node.In addition, static load characteristics is considered to node voltage once or conic section.These quasi-stationary physical responses just take in by tide model naturally set up like this, thus are quasi-stationary sensitivity based on the sensitivity that tide model calculates.Under tide model, if PQ node and PV node number are respectively N pQand N pV, quantity of state x is the voltage magnitude of PQ node control variables u=[Q pQv pVt k] t, wherein the idle injection of PQ node, the voltage magnitude of PV node, be transformer voltage ratio, important complys with variable h=[Q bq pV] t, wherein Q b∈ R bbranch road reactive power flow, it is the idle injection of PV node.At this moment, idle tide model is had:
Q PQ(V PQ,V PV,T k)＝0 (3)
Q b＝Q b(V PQ,V PV,T k) (4)
Q PV＝Q PV(V PQ,V PV,T k) (5)
The computing formula of the idle class sensitivity of quasi-stable state can be obtained in table 1:
The quasi-stationary idle class sensitivity S of table 1 (x, h) ucomputing formula
Wherein all amounts in upper table can directly be inverted obtain tide model (the 3)-Jacobian matrix of (5).
Above the technical scheme that the embodiment of the present invention provides is described in detail, apply specific case herein to set forth the principle of the embodiment of the present invention and execution mode, the explanation of above embodiment is only applicable to the principle helping to understand the embodiment of the present invention; Meanwhile, for one of ordinary skill in the art, according to the embodiment of the present invention, embodiment and range of application all will change, and in sum, this description should not be construed as limitation of the present invention.

Claims (5)

1. plant stand coordinates the method automatically forming plant stand coordination group in automatism voltage control, it is characterized in that:
By the ratio of substation low-voltage side reactive-load compensation equipment to the reactive voltage sensitivity of high-pressure power plant side bus and the idle reactive voltage sensitivity to high-pressure power plant side bus of power generator, compare with the threshold value preset, automatically form plant stand coordination group.
2. a kind of plant stand according to claim 1 coordinates the method automatically forming plant stand coordination group in automatism voltage control, it is characterized in that comprising the following steps:
1), setting a Two-stage control partitioned set is Z i: Z i={ P 1, P 2..., P n, S 1, S 2..., S m, wherein P ifor power plant in subregion, S ifor transformer station in subregion;
2) the plant stand coordination group U that this subregion is corresponding, is set ias follows: U i={ P 1, P 2..., P n, S 1, S 2..., S k, meet k ￡ m, U i∈ Z i.Namely plant stand coordination group is the subset of Two-stage control subregion, its transformer station comprising power plant whole in subregion and participate in plant stand coordination.And by Two-stage control subregion Z iinterior all power plant P ijoin U iin;
3), to U iin power plant P i, calculate the idle reactive voltage sensitivity to high-pressure power plant side bus of power generator
4), to Z iin whole transformer station { S 1, S 2..., S m, to each S j, perform successively:
A) transformer station S is calculated jlow-pressure side reactive-load compensation equipment is to power plant P ithe reactive voltage sensitivity of high-voltage side bus
B) S is calculated jto P isensitivity and P ithe ratio of the sensitivity of self:
If c) judge to meet: r ji>e, then by S jjoin plant stand coordination group U iin;
D) step is returned a), process Z imiddle next transformer station S j+1, until Z iin all transformer station all processed, wherein e is the threshold value preset;
5), step 3 is returned), process U iin next power plant P j+1, until U iin all power plant all processed, Two-stage control subregion Z can be obtained icorresponding plant stand coordination group U i.
3. a kind of plant stand according to claim 2 coordinates the method automatically forming plant stand coordination group in automatism voltage control, it is characterized in that:
Described threshold value is 0.5.
4. a kind of plant stand according to claim 2 coordinates the method automatically forming plant stand coordination group in automatism voltage control, it is characterized in that:
Described threshold value is the tightness degree be coupled between power plant with transformer station.
5. a kind of plant stand according to claim 4 coordinates the method automatically forming plant stand coordination group in automatism voltage control, it is characterized in that:
When described power plant and the tightness degree be coupled between transformer station are for being coupled completely, do not consider that plant stand is coordinated.
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CN105226665A (en) * 2015-10-21 2016-01-06 国家电网公司 The method of busbar voltage daily fluctuation rate is reduced by automatic plant stand cooperation control

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CN105226665A (en) * 2015-10-21 2016-01-06 国家电网公司 The method of busbar voltage daily fluctuation rate is reduced by automatic plant stand cooperation control
CN105226666A (en) * 2015-11-10 2016-01-06 国家电网公司 To the check method of reactive apparatus running status in transformer station's automatism voltage control

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