CN102170136B - Power station voltage reactive power master-slave double-command control method - Google Patents
Power station voltage reactive power master-slave double-command control method Download PDFInfo
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Abstract
The invention discloses a power station voltage reactive power master-slave double-command control method, comprising the following steps: 1) master station AVC (automatic voltage control) scans power grid running status data acquired by SCADA (supervisory control and data acquisition) in real time; 2) the master station AVC makes a running working condition decision and automatically selects power plants and buses participating in calculation and control; 3) area voltage is refreshed to control a quadratic programming model; 4) solving is carried out by a quadratic programming algorithm, the master station AVC sends a double-command control strategy for the power plants through an SCADA telecontrol channel, a main command controls a target for high-voltage bus voltages of all sections, and an auxiliary command controls total upper/lower limit for the reactive power of a hanging unit; and 5) power plant sub-station AVC responds the control strategy sent by the master station through the double commands, and while a voltage command is tracked and a reactive power limit value restraining condition is met, reactive power coordination control in an execution link can be realized. In the method, the target/restraining of a master station AVC calculating link and a sub-station AVC execution link are realized to be consistent, so that the unit reactive power with rapid adjusting speed can be restrained in the practical running process, therefore, the reactive power coordination control in an execution link can be ensured.
Description
Technical field
The invention belongs to field of power system control, the present invention relates to more precisely a kind of main website to major-minor pair of command control method of voltage power-less of power plant's regulation and control.
Background technology
Automatism voltage control (AVC) system carries out automatic monitoring and control to electric network reactive-load voltage, by regulator generator idlely exert oneself, load tap changer and reactive-load compensation equipment, realize that the electric network reactive-load voltage optimization distributes, and satisfies safety, high-quality and economical operation.
The AVC system realizes based on the layering and zoning control model of " voltage global optimization, regional idle equilibrium ".The whole network is being carried out on the dynamic partition basis, by coordinating secondary voltage control (CSVC) method to the closed-loop control of the reactive apparatus such as generator in control partition, realization is followed the tracks of control to maincenter busbar voltage Optimal Setting value, realizes simultaneously idle equiblibrium mass distribution.The CSVC method is a quadratic programming model, is expressed as follows with Mathematical Modeling:
1) target function:
Wherein r and h are weight coefficient, and θ is idle coordination vector (being participation factors), its meaning be utilize the generator number greater than maincenter bus number, have the characteristics of certain degree of freedom, realize the adjustment to the reactive power flow equiblibrium mass distribution.Order in the present invention
Represent that idle participation factors and the idle pondage of this unit are inversely proportional to, what in fact at this moment idle coordination vector was considered is from current operating point, idle adjustment amount is minimum, and under the identical prerequisite of pondage, the unit that sensitivity is larger be should bear larger idle adjustment amount;
2) constraints: comprise the constraint of generator reactive bound
The constraint of critical busses voltage bound
The constraint of control bus voltage step size
CSVC realizes in scheduling station AVC, and power plant is issued the voltage power-less control strategy.Power generator is idle is the important means of electric network reactive-load regulating and controlling voltage, and the AVC of power plant is the actuating station of the whole network reactive voltage control system, and control is followed the tracks of in instruction to scheduling station AVC.At present, the AVC of main website mainly is divided into the idle and two kinds of patterns of high-voltage side bus voltage of Power Plant unit to power plant's regulate and control method.
Document one " Anhui Power Grid automatism voltage control (AVC) system and realization " has proposed a kind of AVC of main website to the control program of power plant, the idle instruction of each unit that the local AVC function receiving scheduling of power plant center AVC system issues, then be forwarded to the reactive-load adjusting device of each unit, adjusting device is actual idle by the comparison unit and the difference of instruction, regulate unit set end voltage set-point, thereby make unit AVR regulate exciting current until the idle command request that reaches of unit.Reactive-load adjusting device can also be regulated the regulator generator excitation system automatically according to 220kV and above busbar voltage curve.The main feature of document one scheme is that main website completes unit without the distribution of work, realizes the idle direct control of exerting oneself of unit.
Document two " research and the realization of Jiangsu Power Grid AVC main station system " has proposed a kind of AVC of main website to the reactive power/voltage control scheme of power plant, calculate as control variables so that unit is idle, control high-voltage side bus voltage setting value that generator articulates to the AVC of power plant but issue, rather than set end voltage or generator reactive are exerted oneself, that the interface is cut apart is clear for son if decide like this, even the passage between assurance and main website goes wrong, the substation still can the curve complete independently is local to be controlled according to presetting, thereby improves the reliability of controlling.The main feature of document two schemes is that main website provides voltage target, then is realized between unit without the distribution of work by the substation.
Above-mentioned document has been realized respectively the AVC of main website differently to the idle online regulation and control of exerting oneself of power generator, and it is idle that unit is directly controlled in document one main website, the idle Distribution Calculation of unit with carry out unanimously, trade-off effect is obvious; Document two main websites set busbar voltage, and are clear with the substation safety responsibility, more easily accept for the field engineer.But in working control, in electrical network between power plant governing speed there are differences, setting under the busbar voltage pattern, governing speed fast power plant robs and sends out idle, causes occurring that voltage meets the demands but idle Imbalance problem.
Therefore, how considering power plant's governing speed difference in working control, prevent and carry out the idle Imbalance of link, is that the AVC of main website carries out to power plant's reactive voltage the problem that closed-loop control waits to solve.
Summary of the invention
Goal of the invention of the present invention is:
In main website, the substation is regulated and controled safely under prerequisite, consider power plant's governing speed difference in the idle calculating of the AVC of main website unit and working control, target/constraint is consistent with substation AVC execution link to realize calculating link by the AVC of main website, prevents the idle Imbalance of unit in regional power grid.
To achieve these goals, the present invention takes following technical scheme to realize:
A kind of main website major-minor pair of command control method of voltage power-less to power plant's regulation and control is characterized in that, comprises the following steps:
1) the operation of power networks status data that gathers of the AVC of main website real time scan SCADA comprises busbar voltage, unit is idle, unit is meritorious, switch tool state etc., and closes lock signal;
2) AVC of main website according to real-time running state and the block signal of bus and Power Plant, carries out the operating condition decision-making, automatically selects the power plant and the bus that participate in calculating and control;
3) refresh regional voltage control quadratic programming model, control variables is that generating set is idle, and target function is that maincenter busbar voltage deviation is minimum, and takes into account the idle torque equilibrium of unit;
4) find the solution by Novel Algorithm, obtain the idle increment optimal solution of control variables unit, main website issues control strategy to power plant by two instructions, and master instruction refers to the high-voltage side bus voltage setting value, auxiliary instruction refers to articulate the total upper limit of the idle control of unit, articulates the total lower limit of the idle control of unit; Namely when lower power plant control command, except issuing the voltage desired value, issue simultaneously the idle real-time control up/down limit value of unit, when a plurality of units of many power plant in the given area start when regulating simultaneously, can prevent in working control that governing speed is fast but control the low unit of sensitivity and rob and send out idle and cause idle Imbalance phenomenon;
5) power substation AVC responds the control strategy that main website issues by two instructions, satisfy simultaneously the reactive limit value constraint in the floating voltage instruction, make fast idle can being inhibited of unit of governing speed in actual motion, and the slow unit of governing speed is idle sufficient response capacity arranged, realize that the idle coordination of carrying out link controls.
The beneficial effect that the present invention reaches: the AVC of main website adopts major-minor pair of instruction of voltage power-less to issue to power plant's reactive power/voltage control strategy, target/constraint is consistent with substation AVC execution link to realize calculating link by the AVC of main website, when a plurality of units of many power plant in the given area start adjusting simultaneously, can prevent in working control that governing speed is fast but control the low unit of sensitivity and rob and send out idle and cause idle Imbalance phenomenon, the idle coordination of the AVC of main website is effectively carried out in the substation, guarantees simultaneously idle real time coordination control effect in the floating voltage set point.
Description of drawings
The regional voltage control schematic diagram of 1 liang of machine of accompanying drawing;
Accompanying drawing 2 power substation AVC control schematic diagram.
Embodiment
Major-minor pair of command control method of voltage power-less that the main website that the present invention proposes regulates and controls power plant reaches by reference to the accompanying drawings embodiment and is described in detail as follows:
Accompanying drawing 1 is the regional voltage control schematic diagrames of two machines, has typicalness.In figure, the control area comprises 2 power plant buses (BUS1/BUS2), 1 maincenter bus (BUS3) and two generators (G1/G3).The control method that the present invention proposes will be calculated each generator reactive as target take the maincenter busbar voltage deviation minimum of taking into account idle equilibrium and exert oneself, and simultaneously issuing busbar voltage set point and idle bound to the AVC of power plant substation, power substation AVC satisfies the reactive limit value constraint simultaneously following the tracks of the busbar voltage set point.Specifically comprise the following steps:
1) the operation of power networks status data that gathers of the AVC of main website real time scan SCADA comprises, unit is idle, unit is meritorious, switch tool state etc., and closes lock signal, wherein busbar voltage V=[V
1, V
2, V
3]
T, unit the is idle Q=[Q that exerts oneself
1, Q
2, Q
3]
T
2) AVC of main website is according to real-time running state and the block signal of bus and Power Plant, carry out the operating condition decision-making, automatically select to participate in Power Plant and the bus of calculating and control, wherein carry out real-time topology according to the switch tool state, and judge in conjunction with measuring aggregation of data whether unit, bus are in the charging operation state, whether normal according to block signal judgement operation, select to participate in the equipment of calculating and control according to running status, described block signal comprises that unit increases magnetic latch/demagnetize locking/dysregulation;
3) refresh regional voltage control quadratic programming model, control variables is that generating set is idle, and target function is that maincenter busbar voltage deviation is minimum, and takes into account the idle torque equilibrium of unit, and concrete mathematical model is passed away, and CSVC is relevant in the scape technology sets forth.
4) find the solution by Novel Algorithm, obtain the idle increment optimal solution of control variables unit
Be converted into main website to the control strategy of power plant, as accompanying drawing 2, concrete control command comprises the high-voltage side bus voltage setting value again
Articulate the total upper limit of the idle control of unit
Articulate the total lower limit of the idle control of unit
Wherein each instruction component calculation method is as follows:
A) high-voltage side bus voltage setting value:
B) articulate the total upper limit of the idle control of unit
If the idle increment of unit
If the idle increment of unit
C) articulate the total lower limit of the idle control of unit
If the idle increment of unit
If the idle increment of unit
Wherein: V
HThe high-voltage side bus current voltage, C
vgThe idle sensitivity to busbar voltage of unit,
The idle increment of adjustment of unit that solves, Q
gThat unit is current idle.
5) power substation AVC is to the control strategy of answering main website to issue by two instructions, satisfy simultaneously the reactive limit value constraint in the floating voltage instruction, make fast idle can being inhibited of unit of governing speed in actual motion, and the slow unit of governing speed is idle sufficient response capacity arranged, realize that the idle coordination of carrying out link controls.
In the present embodiment, voltage power-less and sensitivity thereof represents by perunit value, and selecting Bus3 is the maincenter bus, and current voltage is 1.0, and target voltage is 1.1, and controlling the dead band is 0.01; Generator G1, the G2 pondage is identical and currently idlely be 0.3, control sensitivity to bus Bus3 is 0.1, generator G1 is 0.12, is 0.05 to the control sensitivity of Bus2 the control sensitivity of Bus1, generator G2 is 0.12, is 0.05 to the control sensitivity of Bus1 the control sensitivity of Bus2, the step size of Bus1 and Bus2 is 0.1, and controlling the dead band is 0.01, and current voltage is 1.02, the bound interval is [0.85,1.15].The AVC of main website finds the solution quadratic programming problem, and unit G1, G2 idle work optimization increment are 0.4975, Bus1, the Bus2 regulated quantity is 0.0846.
If main website only issues the busbar voltage set point 1.2046 of Bus1, Bus2 when power plant is regulated and controled, in working control, generator G2 governing speed is very fast, idle increment of adjustment reaches 0.6, the idle increment of adjustment of generator G1 will should be 0.396 mutually, this moment, maincenter busbar voltage deviation was 0.0005, had satisfied the control dead band that the AVC of main website requires, and after meanwhile Bus2 regulates, the bus voltage increment is 0.0918, differ 0.0042 with set point, also satisfy and control the dead band.But idle Imbalance has appearred this moment.
From above analysis as seen, when issuing Bus1, Bus2 busbar voltage set point, with idle bound interval [0.3,0.7975] issue simultaneously, when governing speed faster generator G2 idle exert oneself to arrive at will stop in limited time regulating, the slower generator G1 of governing speed will have sufficient response capacity, realize carrying out the idle coordination control of link.
Main website makes main website and substation voltage target and idle constraint unanimous between the higher and lower levels to major-minor pair of instruction method of voltage power-less of power plant's regulation and control, has guaranteed to carry out link in working control abundant response and the real-time idle coordination of calculating link are controlled.
The present invention is illustrated according to the preferred embodiment, should be appreciated that but above-described embodiment does not limit the present invention in any form, and all employings are equal to replaces or technical scheme that the form of equivalent transformation obtains, within all dropping on protection scope of the present invention.
Claims (2)
1. a power station voltage reactive power master-slave double-command control method, is characterized in that, comprises the following steps:
1) the operation of power networks status data that gathers of the AVC of main website real time scan SCADA comprises busbar voltage, generating set is idle, unit is meritorious, switch tool state and close lock signal;
2) AVC of main website according to real-time running state and the block signal of bus and Power Plant, carries out the operating condition decision-making, automatically selects the power plant and the bus that participate in calculating and control;
3) refresh regional voltage control quadratic programming model, control variables is that generating set is idle, and target function is that maincenter busbar voltage deviation is minimum, and takes into account the idle torque equilibrium of generating set;
4) find the solution by Novel Algorithm, obtain the idle increment optimal solution of control variables unit, main website issues control strategy to power plant by two instructions, master instruction refers to the high-voltage side bus voltage setting value, auxiliary instruction refers to articulate the total upper limit of the idle control of generating set, articulates the total lower limit of the idle control of generating set;
5) power substation AVC responds the control strategy that main website issues by two instructions, satisfy simultaneously the reactive limit value constraint in the floating voltage instruction, make fast idle can being inhibited of generating set of governing speed in actual motion, and the slow generating set of governing speed is idle sufficient response capacity arranged, realize that the idle coordination of carrying out link controls.
2. power station voltage reactive power master-slave double-command control method according to claim 1, it is characterized in that, in step 4), main website comprises the high-voltage side bus voltage setting value, articulates the total upper limit of the idle control of generating set the control strategy of power plant, articulate the total lower limit of the idle control of generating set, each instruction component calculation method is:
A) high-voltage side bus voltage setting value:
B) articulate the total upper limit of the idle control of generating set
If the idle increment of generating set
If the idle increment of generating set
C) articulate the total lower limit of the idle control of generating set
If the idle increment of generating set
If the idle increment of generating set
Wherein: V
HThe high-voltage side bus current voltage, C
vgThe idle sensitivity to busbar voltage of generating set,
The idle increment of adjustment of generating set that solves, Q
gThat unit is current idle.
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| CN102541049A (en) * | 2011-12-26 | 2012-07-04 | 四川中鼎科技有限公司 | Test method for automatic voltage control system |
| CN102708261B (en) * | 2012-06-04 | 2016-08-10 | 中国电力科学研究院 | The modeling method of automatism voltage control model in a kind of electric system simulation |
| CN104135014B (en) * | 2013-06-07 | 2017-04-19 | 中电投河南电力有限公司技术信息中心 | Optimization control method for reactive power of power plant |
| CN103390893B (en) * | 2013-06-25 | 2015-02-25 | 许继集团有限公司 | Automatic voltage control (AVC) method for hydropower station |
| CN103401272B (en) * | 2013-06-28 | 2015-08-12 | 国电南瑞科技股份有限公司 | Based on the photovoltaic electric station grid connection voltage control method of regional coordination |
| CN103532148B (en) * | 2013-09-27 | 2015-11-18 | 国电南瑞科技股份有限公司 | The reactive coordination control method of a kind of wind energy turbine set and area power grid |
| CN106253306B (en) * | 2016-10-13 | 2018-08-03 | 国家电网公司 | A kind of power plant AVC control sub-station emulation modes |
| CN110635524A (en) * | 2019-09-17 | 2019-12-31 | 国网江苏省电力有限公司 | Reactive voltage steady-state control method and device based on multi-FACTS element coordination control |
| CN116093962B (en) * | 2023-04-11 | 2023-07-07 | 国网山西省电力公司运城供电公司 | Automatic voltage control method and device for new energy electric field based on double instructions |
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| CN100544156C (en) * | 2007-11-09 | 2009-09-23 | 上海可鲁系统软件有限公司 | A kind of method for electric voltage idle work regulation switch control |
| CN100557918C (en) * | 2008-01-11 | 2009-11-04 | 清华大学 | Power plant and transformer station's coordinating voltage control method based on the coordination constraint real-time update |
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