CN111555288B - Track sensitivity-based secondary voltage control method and system for power system - Google Patents

Track sensitivity-based secondary voltage control method and system for power system Download PDF

Info

Publication number
CN111555288B
CN111555288B CN202010278519.1A CN202010278519A CN111555288B CN 111555288 B CN111555288 B CN 111555288B CN 202010278519 A CN202010278519 A CN 202010278519A CN 111555288 B CN111555288 B CN 111555288B
Authority
CN
China
Prior art keywords
voltage
control
control variable
reactive
secondary voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010278519.1A
Other languages
Chinese (zh)
Other versions
CN111555288A (en
Inventor
徐陆飞
陈天华
陈建华
杜磊
熊正勇
李�根
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nari Technology Co Ltd
State Grid Electric Power Research Institute
Original Assignee
Nari Technology Co Ltd
State Grid Electric Power Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nari Technology Co Ltd, State Grid Electric Power Research Institute filed Critical Nari Technology Co Ltd
Priority to CN202010278519.1A priority Critical patent/CN111555288B/en
Publication of CN111555288A publication Critical patent/CN111555288A/en
Application granted granted Critical
Publication of CN111555288B publication Critical patent/CN111555288B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • 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

Landscapes

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

Abstract

The invention discloses a track sensitivity-based secondary voltage control method and system for an electric power system, wherein after a control variable reactive power adjustment amount is determined through coordinated secondary voltage control, whether the grid voltage exceeds a voltage stability limit value after the coordinated secondary voltage control is executed is evaluated based on a key fault set, then a secondary planning model is established by taking the minimum deviation between the voltage and the voltage stability limit value and the minimum control cost as a control objective function, based on the track sensitivity, the control variable reactive power adjustment amount is determined, the control variable reactive power adjustment amount and the original control variable reactive power adjustment amount are combined, a constraint condition in the coordinated secondary voltage control is corrected, and then the control variable reactive power adjustment amount is determined through the coordinated secondary voltage control until the grid voltage does not exceed the voltage stability limit value after the coordinated secondary voltage control is executed based on the evaluation of the key fault set. The invention increases the safety check of the power grid disturbance voltage recovery on the basis of the original coordination of secondary voltage control, and improves the long-term stability of the system voltage.

Description

Track sensitivity-based secondary voltage control method and system for power system
Technical Field
The invention belongs to the technical field of operation and control of electric power systems, and particularly relates to a track sensitivity-based secondary voltage control method and system for an electric power system.
Background
The two-stage voltage control method based on the partitions has the advantages that the partitions are independently controlled, and the interaction effect between the partitions and the areas is not considered. The voltage control subarea adopts a layered subarea method, and the relation among all voltage levels is forcibly decoupled. When other subareas have faults, because the change of the voltage of the central bus in the non-fault subarea is generally very small, the reactive power equipment in the non-fault subarea can not act, and even the reactive power support of the reactive power regulation equipment to the system can be reduced due to the secondary voltage control. Under severe fault conditions, the system is unable to adequately mobilize the most favorable reactive resources to quickly restore voltage, which is extremely detrimental to long-term voltage stability. Therefore, in the steady-state secondary voltage control, the voltage change condition of the system under the serious fault is considered, the voltage safety is ensured, and the system stability is kept.
Disclosure of Invention
The invention provides a track sensitivity-based power system secondary voltage control method and system, aiming at solving the technical problem that transient characteristics of a system are not considered in the existing secondary voltage control technology, and reactive resources cannot be fully transferred to quickly recover voltage under the condition of serious faults.
The technical scheme adopted by the invention is as follows:
an embodiment of the present invention provides a method for controlling a secondary voltage of a power system based on trajectory sensitivity, including:
establishing a coordinated secondary voltage control model of each partition based on the coordinated secondary voltage control partition, and performing coordinated secondary voltage control calculation to obtain a control variable reactive power adjustment quantity of each partition in a steady state;
simulating the voltage instability condition of the power system under the control variable reactive power adjustment quantity in the steady state according to the power grid operation mode data, and generating a track sensitivity set of the control variable to a voltage instability bus when a key fault occurs;
and constructing a quadratic programming model based on the track sensitivity, correcting the coordinated secondary voltage control model until the voltage of the power system is not unstable under the control variable reactive power adjustment quantity under the solved stable state, and executing the control variable reactive power adjustment quantity under the stable state.
Further, establishing a coordinated secondary voltage control model of each zone based on the coordinated secondary voltage control zones includes:
Figure BDA0002445682610000011
wherein, alpha and beta are weight coefficients, Δ VpAnd thetagReactive margins, V, of the neutral bus voltage deviation and control variable g, respectivelyp，VpmaxAnd VpminThe current value, the upper limit and the lower limit of the neutral bus voltage, VH，VHmax，VHminAnd
Figure BDA0002445682610000021
respectively the current value, the upper limit, the lower limit and the maximum voltage adjustment quantity, Q of the control variable bus voltageg，QgmaxAnd QgminRespectively, the current, upper and lower reactive limits, Δ Q, of the control variable ggReactive adjustment for the control variable g in the steady state, CpgAnd CgRespectively, a reactive voltage sensitivity matrix of the control variable g to the central bus and a reactive voltage sensitivity matrix of the control variable g to the bus.
Further, the simulating a voltage instability condition of the power system under the control variable reactive power adjustment amount in the steady state according to the power grid operation mode data to generate a trajectory sensitivity set of the control variable to the voltage instability bus when a key fault occurs, including:
carrying out dynamic simulation on the power system according to the power grid operation mode data under the condition of controlling variable reactive power adjustment quantity action in the steady state, determining that the power system has voltage instability faults under various fault conditions, and forming a key fault set;
according to the key fault set, when each key fault causes voltage instability, respectively calculating the dynamic response curves of the voltage of the power system under the conditions of no action of a control variable and action of the control variable, taking the difference value of the dynamic response curves of the voltage of the power system under the two conditions as the track sensitivity of the control variable to a voltage instability bus, and selecting the track sensitivity greater than a track sensitivity threshold value to form a track sensitivity set of the control variable to the voltage instability bus.
Further, the constructing a quadratic programming model based on the trajectory sensitivity includes:
Figure BDA0002445682610000022
wherein, WαAnd WβIs a weight coefficient, V0Controlling the front voltage amplitude, V, for a voltage-destabilizing buslimFor voltage stability limit, Δ ugReactive adjustment of the control variable g in the transient state, SgSet of trajectory sensitivities for the control variable g to all voltage-destabilizing buses, SigFor controlling the trace sensitivity, V, of the variable g to the voltage-destabilizing bus i at the end of the simulationi' for coordinating the voltage amplitude, V, of the voltage-destabilizing bus i under the control of the secondary voltageimaxAnd ViminRespectively an upper voltage limit and a lower voltage limit, Q ', of the voltage-unstable bus i'gTo coordinate the reactive value of the control variable g under secondary voltage control, i.e. Q'g＝Qg+ΔQg，QgmaxAnd QgminRespectively the upper reactive limit and the lower reactive limit of the control variable g,
Figure BDA0002445682610000023
the step size is adjusted for the control variable.
Further, the modifying the coordinated secondary voltage control model includes:
solving the quadratic programming model, and determining a control variable reactive power adjustment amount under a transient state;
correcting the coordination secondary voltage control model by adopting the reactive adjustment quantity of the control variable under the transient state;
according to the corrected coordinated secondary voltage control model, performing coordinated secondary voltage control calculation again to obtain a control variable reactive power adjustment quantity under a steady state;
simulating the voltage instability condition of the power system under the control variable reactive power adjustment quantity in the steady state according to the power grid operation mode data, and finishing the correction if the voltage is not unstable any more; and otherwise, continuously correcting the coordination secondary voltage control model.
Further, a linear programming method is adopted to solve the quadratic programming model.
Further, the modifying the coordinated secondary voltage control model by using the reactive power adjustment of the control variable under the transient state includes:
will coordinate the constraint Q in the secondary voltage control modelgmin≤Qg+ΔQg≤QgmaxIs corrected to Qg+ΔQgn-1+Δugn-1≤Qg+ΔQgn≤Qgmax，
Wherein, is Δ Qgn-1Reactive adjustment of the control variable g in steady state, Δ u, calculated for the n-1 th coordinated secondary voltage controlgn-1For the reactive adjustment of the control variable g in the transient state calculated n-1, Δ QgnAnd the reactive adjustment quantity of the control variable g under the steady state is calculated for the nth time of coordination of the secondary voltage control.
In another aspect, an embodiment of the present invention further provides a track sensitivity-based secondary voltage control system for an electrical power system, including:
the coordination secondary voltage control module is used for establishing a coordination secondary voltage control model of each subarea based on the coordination secondary voltage control subareas, and performing coordination secondary voltage control calculation to obtain control variable reactive power adjustment quantity of each subarea under a steady state;
the voltage stability checking module is used for simulating the voltage instability condition of the power system under the control variable reactive power adjustment quantity in the steady state according to the power grid operation mode data and generating a track sensitivity set of the control variable to the voltage instability bus when a key fault occurs;
and the voltage stability correction module is used for constructing a quadratic programming model based on the track sensitivity and correcting the coordinated secondary voltage control model until the voltage of the power system is not unstable under the control variable reactive power adjustment quantity under the solved stable state.
Further, the voltage stabilization correction module is specifically configured to construct a quadratic programming model:
Figure BDA0002445682610000031
wherein, WαAnd WβIs a weight coefficient, V0Controlling the front voltage amplitude, V, for a voltage-destabilizing buslimFor voltage stability limit, Δ ugReactive adjustment of the control variable g in the transient state, SgSet of trajectory sensitivities for the control variable g to all voltage-destabilizing buses, SigFor controlling the trace sensitivity, V, of the variable g to the voltage-destabilizing bus i at the end of the simulationi' for coordinating the voltage amplitude, V, of the voltage-destabilizing bus i under the control of the secondary voltageimaxAnd ViminRespectively an upper voltage limit and a lower voltage limit, Q ', of the voltage-unstable bus i'gFor coordinating the reactive value, Q, of the control variable g under control of the secondary voltagegmaxAnd QgminRespectively the upper reactive limit and the lower reactive limit of the control variable g,
Figure BDA0002445682610000032
the step size is adjusted for the control variable.
Further, the voltage stabilization correction module is specifically configured to,
will coordinate the constraint Q in the secondary voltage control modelgmin≤Qg+ΔQg≤QgmaxIs corrected to Qg+ΔQgn-1+Δugn-1≤Qg+ΔQgn≤Qgmax，
Wherein, is Δ Qgn-1Reactive adjustment of the control variable g in steady state, Δ u, calculated for the n-1 th coordinated secondary voltage controlgn-1For the reactive adjustment of the control variable g in the transient state calculated n-1, Δ QgnReactive adjustment of the steady-state control variable g, Q, calculated for the nth coordinated secondary voltage controlgTo control the reactive current value of the variable g, Δ QgThe reactive adjustment quantity of the control variable g under the steady state.
The invention achieves the following beneficial effects:
the invention provides a track sensitivity-based secondary voltage control method and system for an electric power system, wherein after a coordinated secondary voltage control determines a control variable reactive power adjustment value under a steady state, whether the grid voltage exceeds a voltage stability limit value after the coordinated secondary voltage control is executed is evaluated based on a key fault set, then a constraint condition for recovering the voltage is established by taking the minimum deviation between the voltage and the voltage stability limit value and the minimum control cost as a control target function, the control variable reactive power adjustment value under a transient state is determined, the control variable reactive power adjustment value under the steady state and the control variable reactive power adjustment value under the transient state are combined, the constraint condition of the control variable in the coordinated secondary voltage control is modified, the control variable reactive power adjustment value under the steady state is determined by the coordinated secondary voltage control until the grid voltage does not exceed the voltage stability limit value after the coordinated secondary voltage control is evaluated based on the key fault set, the invention improves the long-term voltage stability of the system by adding the safety check of voltage recovery during power grid disturbance on the basis of the original coordination of secondary voltage control.
Drawings
FIG. 1 is a flow chart of a method for controlling the secondary voltage of a power system based on trajectory sensitivity according to the present invention;
fig. 2 is a schematic structural diagram of a track sensitivity-based power system secondary voltage control system of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below for convenience and clarity in describing embodiments of the present invention.
In one aspect, the present invention provides a method for controlling a secondary voltage of a power system based on a trajectory sensitivity, as shown in fig. 1, including the following steps:
step S101: based on the coordination secondary voltage control subarea, establishing a coordination secondary voltage control model by aiming at the minimum voltage deviation and the maximum reactive margin of a central bus in the voltage control subarea, performing coordination secondary voltage control calculation on each subarea, and solving a control variable reactive power adjustment quantity, wherein an objective function is as follows:
Figure BDA0002445682610000041
in the formula: alpha and beta are weight coefficients; Δ VpAnd thetagRespectively the voltage deviation of the central bus and the reactive margin of the control variable g; vp，VpmaxAnd VpminRespectively representing the current value, the upper limit and the lower limit of the neutral bus voltage; vH，VHmax，VHminAnd
Figure BDA0002445682610000051
respectively controlling the current value, the upper limit, the lower limit and the maximum voltage adjustment quantity of the variable bus voltage; qg，QgmaxAnd QgminRespectively a reactive current value, an upper limit and a lower limit of a control variable g; delta QgReactive adjustment for the control variable g in the steady state, CpgAnd CgRespectively, a reactive voltage sensitivity matrix of the control variable g to the central bus and a reactive voltage sensitivity matrix of the control variable g to the bus.
Step S102: calculating a generated control variable reactive power adjustment quantity under a steady state according to the operation mode data of the power system and the coordinated secondary voltage control model, simulating and calculating the voltage stabilization condition under the condition that the power system has a fault, and generating a key fault set of voltage instability; and calculating the track sensitivity of the control variable to the voltage-destabilizing bus when each key fault occurs, and generating a track sensitivity set of the control variable to the voltage-destabilizing bus when the key fault occurs.
Further, according to the reactive adjustment quantity of the control variable under the steady state generated by the operation mode data of the power system and the coordinated secondary voltage control calculation, the voltage stability condition under the condition that the power system has a fault is simulated and calculated, and a key fault set of voltage instability is generated, wherein the method comprises the following steps:
and carrying out dynamic simulation on the power system according to the condition of the reactive power adjustment quantity action of the control variable under the steady state, determining that the power system has voltage instability faults under various fault conditions, and generating a key fault set.
Further, calculating the trajectory sensitivity of the control variable to the voltage-destabilizing bus when each key fault occurs, and generating a trajectory sensitivity set of the control variable to the voltage-destabilizing bus when the key fault occurs, including:
according to the key fault set, when each key fault causes voltage instability, respectively calculating a system voltage dynamic response curve under the condition of the inaction and the action of a control variable, taking the difference value as the track sensitivity of the control variable to a voltage instability bus, selecting the track sensitivity greater than a track sensitivity threshold value, and forming a track sensitivity set of the control variable to the voltage instability bus:
Sg＝{|Sig|＞Slim}
in the formula, SgSet of trajectory sensitivities for the control variable g to all voltage-destabilizing buses, SigFor controlling the trace sensitivity of the variable g to the voltage-destabilizing bus i at the end of the simulation, SlimIs a track sensitivity threshold.
It should be noted that a trajectory sensitivity set is generated under a critical fault, and each critical fault needs to be simulated according to the critical fault set.
Step S103: when the voltage of the power system is unstable, the minimum deviation between the voltage and the voltage stability limit value and the minimum control cost are taken as a control objective function, and based on the track sensitivity, a constraint condition for recovering the voltage is established to form a quadratic programming model based on the track sensitivity, which comprises the following steps:
Figure BDA0002445682610000061
in the formula: wαAnd WβIs a weight coefficient; v0Controlling a front voltage amplitude for the voltage instability bus; vlimIs a voltage stability limit; Δ ugThe reactive adjustment quantity is the control variable g under the transient state; vi' for coordinating the voltage amplitude, V, of the voltage-destabilizing bus i under the control of the secondary voltageimaxAnd ViminThe upper voltage limit and the lower voltage limit of the voltage instability bus i are respectively; q'gTo coordinate the reactive value of the control variable g under secondary voltage control, i.e. Q'g＝Qg+ΔQg，QgmaxAnd QgminRespectively the upper limit and the lower limit of the reactive power of the control variable g;
Figure BDA0002445682610000062
the step size is adjusted for the control variable.
Step S104: and solving the quadratic programming model based on the track sensitivity by using a linear programming method, and determining the reactive power adjustment quantity of the control variable under the transient state.
Solution based Δ ugAnd correcting constraint conditions in the coordinated secondary voltage control model, namely:
will Qgmin≤Qg+ΔQg≤QgmaxIs corrected to Qg+ΔQgn-1+Δugn-1≤Qg+ΔQgn≤Qgmax，
Wherein, is Δ Qgn-1Reactive adjustment of the control variable g in steady state, Δ u, calculated for the n-1 th coordinated secondary voltage controlgn-1For the reactive adjustment of the control variable g in the transient state calculated n-1, Δ QgnAnd (3) calculating the reactive adjustment quantity of the control variable g under the steady state for the nth-time coordination secondary voltage control, wherein n is more than or equal to 1.
Step S105: returning to the step S101 according to the corrected control variable constraint condition, recalculating the reactive power adjustment quantity of the control variable in the steady state, executing the step S102, performing dynamic simulation of the power system based on the key fault set, ending verification when the voltage is not unstable any more, and executing the reactive power adjustment quantity of the control variable in the steady state calculated in the step S101; when there is also a voltage instability condition, execution continues with step S103.
Another aspect of the embodiments of the present invention further provides a track sensitivity-based secondary voltage control system for an electric power system, referring to fig. 2, including:
the coordinated secondary voltage control module 201 is used for establishing a coordinated secondary voltage control model of each partition based on the coordinated secondary voltage control partition, and performing coordinated secondary voltage control calculation to obtain a control variable reactive power adjustment quantity of each partition in a steady state;
the voltage stability checking module 202 is configured to simulate a voltage instability condition of the power system under the control variable reactive power adjustment amount in the steady state according to the power grid operation mode data, and generate a trajectory sensitivity set of the control variable to a voltage instability bus when a key fault occurs;
and the voltage stability correction module 203 is configured to construct a quadratic programming model based on the trajectory sensitivity, and correct the coordinated secondary voltage control model until the voltage of the power system is no longer unstable under the control variable reactive power adjustment quantity in the solved steady state.
Further, the voltage stabilization correction module is specifically configured to construct a quadratic programming model:
Figure BDA0002445682610000071
wherein, WαAnd WβIs a weight coefficient, V0Controlling the front voltage amplitude, V, for a voltage-destabilizing buslimFor voltage stability limit, Δ ugReactive adjustment of the control variable g in the transient state, SgSet of trajectory sensitivities for the control variable g to all voltage-destabilizing buses, SigFor controlling the trace sensitivity, V, of the variable g to the voltage-destabilizing bus i at the end of the simulationi' for coordinating the voltage amplitude, V, of the voltage-destabilizing bus i under the control of the secondary voltageimaxAnd ViminRespectively an upper voltage limit and a lower voltage limit, Q ', of the voltage-unstable bus i'gFor coordinating the reactive value, Q, of the control variable g under control of the secondary voltagegmaxAnd QgminRespectively the upper reactive limit and the lower reactive limit of the control variable g,
Figure BDA0002445682610000072
the step size is adjusted for the control variable.
Further, the voltage stabilization correction module is specifically configured to,
will coordinate the constraint Q in the secondary voltage control modelgmin≤Qg+ΔQg≤QgmaxIs corrected to Qg+ΔQgn-1+Δugn-1≤Qg+ΔQgn≤Qgmax，
Wherein, is Δ Qgn-1Reactive adjustment of the control variable g in steady state, Δ u, calculated for the n-1 th coordinated secondary voltage controlgn-1For the reactive adjustment of the control variable g in the transient state calculated n-1, Δ QgnReactive adjustment of the steady-state control variable g, Q, calculated for the nth coordinated secondary voltage controlgTo control the reactive current value of the variable g, Δ QgThe reactive adjustment quantity of the control variable g under the steady state.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (7)

1. The track sensitivity-based power system secondary voltage control method is characterized by comprising the following steps of:
establishing a coordinated secondary voltage control model of each partition based on the coordinated secondary voltage control partition, and performing coordinated secondary voltage control calculation to obtain a control variable reactive power adjustment quantity of each partition in a steady state;
simulating the voltage instability condition of the power system under the control variable reactive power adjustment quantity in the steady state according to the power grid operation mode data, and generating a track sensitivity set of the control variable to a voltage instability bus when a key fault occurs;
constructing a quadratic programming model based on the track sensitivity, correcting the coordinated secondary voltage control model until the voltage of the power system is not unstable under the control variable reactive power adjustment quantity under the solved stable state, and executing the control variable reactive power adjustment quantity under the stable state;
constructing a quadratic programming model based on the trajectory sensitivity, comprising:
Figure FDA0003126029660000011
wherein, WαAnd WβIs a weight coefficient, V0Controlling the front voltage amplitude, V, for a voltage-destabilizing buslimFor voltage stability limit, Δ ugReactive adjustment of the control variable g in the transient state, SgSet of trajectory sensitivities for the control variable g to all voltage-destabilizing buses, SigFor controlling the trace sensitivity, V, of the variable g to the voltage-destabilizing bus i at the end of the simulationi' for coordinating the voltage amplitude, V, of the voltage-destabilizing bus i under the control of the secondary voltageimaxAnd ViminRespectively an upper voltage limit and a lower voltage limit, Q ', of the voltage-unstable bus i'gTo coordinate the reactive value of the control variable g under secondary voltage control, i.e. Q'g＝Qg+ΔQg，QgmaxAnd QgminRespectively the upper reactive limit and the lower reactive limit of the control variable g,
Figure FDA0003126029660000012
the step size is adjusted for the control variable.
2. The track sensitivity-based power system secondary voltage control method according to claim 1, wherein the establishing a coordinated secondary voltage control model for each zone based on the coordinated secondary voltage control partition comprises:
Figure FDA0003126029660000013
wherein, alpha and beta are weight coefficients, Δ VpAnd thetagReactive margins, V, of the neutral bus voltage deviation and control variable g, respectivelyp，VpmaxAnd VpminThe current value, the upper limit and the lower limit of the neutral bus voltage, VH，VHmax，VHminAnd
Figure FDA0003126029660000014
respectively the current value, the upper limit, the lower limit and the maximum voltage adjustment quantity, Q of the control variable bus voltageg，QgmaxAnd QgminAre respectively controlledReactive current, upper and lower limits, Δ Q, of the manipulated variable ggReactive adjustment for the control variable g in the steady state, CpgAnd CgRespectively, a reactive voltage sensitivity matrix of the control variable g to the central bus and a reactive voltage sensitivity matrix of the control variable g to the bus.
3. The track sensitivity-based power system secondary voltage control method according to claim 1, wherein the simulating a voltage instability condition of the power system under the reactive adjustment quantity of the control variable in the steady state according to the power grid operation mode data to generate a track sensitivity set of the control variable to a voltage instability bus when a critical fault occurs comprises:
carrying out dynamic simulation on the power system according to the power grid operation mode data under the condition of controlling variable reactive power adjustment quantity action in the steady state, determining that the power system has voltage instability faults under various fault conditions, and forming a key fault set;
according to the key fault set, when each key fault causes voltage instability, respectively calculating the dynamic response curves of the voltage of the power system under the conditions of no action of a control variable and action of the control variable, taking the difference value of the dynamic response curves of the voltage of the power system under the two conditions as the track sensitivity of the control variable to a voltage instability bus, and selecting the track sensitivity greater than a track sensitivity threshold value to form a track sensitivity set of the control variable to the voltage instability bus.
4. The trajectory sensitivity-based power system secondary voltage control method of claim 1, wherein the modifying the coordinated secondary voltage control model comprises:
solving the quadratic programming model, and determining a control variable reactive power adjustment amount under a transient state;
correcting the coordination secondary voltage control model by adopting the reactive adjustment quantity of the control variable under the transient state;
according to the corrected coordinated secondary voltage control model, performing coordinated secondary voltage control calculation again to obtain a control variable reactive power adjustment quantity under a steady state;
simulating the voltage instability condition of the power system under the control variable reactive power adjustment quantity in the steady state according to the power grid operation mode data, and finishing the correction if the voltage is not unstable any more; and otherwise, continuously correcting the coordination secondary voltage control model.
5. The trajectory sensitivity-based power system secondary voltage control method according to claim 4, wherein the quadratic programming model is solved by a linear programming method.
6. The trajectory sensitivity-based power system secondary voltage control method of claim 4, wherein the modifying the coordinated secondary voltage control model with the transient-state lower control variable reactive power adjustment comprises:
will coordinate the constraint Q in the secondary voltage control modelgmin≤Qg+ΔQg≤QgmaxIs corrected to Qg+ΔQgn-1+Δugn-1≤Qg+ΔQgn≤Qgmax，
Wherein, is Δ Qgn-1Reactive adjustment of the control variable g in steady state, Δ u, calculated for the n-1 th coordinated secondary voltage controlgn-1For the reactive adjustment of the control variable g in the transient state calculated n-1, Δ QgnAnd the reactive adjustment quantity of the control variable g under the steady state is calculated for the nth time of coordination of the secondary voltage control.
7. Electric power system secondary voltage control system based on track sensitivity includes:
the coordination secondary voltage control module is used for establishing a coordination secondary voltage control model of each subarea based on the coordination secondary voltage control subareas, and performing coordination secondary voltage control calculation to obtain control variable reactive power adjustment quantity of each subarea under a steady state;
the voltage stability checking module is used for simulating the voltage instability condition of the power system under the control variable reactive power adjustment quantity in the steady state according to the power grid operation mode data and generating a track sensitivity set of the control variable to the voltage instability bus when a key fault occurs;
the voltage stability correction module is used for constructing a quadratic programming model based on the track sensitivity and correcting the coordinated secondary voltage control model until the voltage of the power system is not unstable under the control variable reactive power adjustment quantity under the solved stable state;
the quadratic programming model is as follows:
Figure FDA0003126029660000031
wherein, WαAnd WβIs a weight coefficient, V0Controlling the front voltage amplitude, V, for a voltage-destabilizing buslimFor voltage stability limit, Δ ugReactive adjustment of the control variable g in the transient state, SgSet of trajectory sensitivities for the control variable g to all voltage-destabilizing buses, SigFor controlling the trace sensitivity, V, of the variable g to the voltage-destabilizing bus i at the end of the simulationi' for coordinating the voltage amplitude, V, of the voltage-destabilizing bus i under the control of the secondary voltageimaxAnd ViminRespectively an upper voltage limit and a lower voltage limit, Q ', of the voltage-unstable bus i'gFor coordinating the reactive value, Q, of the control variable g under control of the secondary voltagegmaxAnd QgminRespectively the upper reactive limit and the lower reactive limit of the control variable g,
Figure FDA0003126029660000032
the step size is adjusted for the control variable.
CN202010278519.1A 2020-04-10 2020-04-10 Track sensitivity-based secondary voltage control method and system for power system Active CN111555288B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010278519.1A CN111555288B (en) 2020-04-10 2020-04-10 Track sensitivity-based secondary voltage control method and system for power system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010278519.1A CN111555288B (en) 2020-04-10 2020-04-10 Track sensitivity-based secondary voltage control method and system for power system

Publications (2)

Publication Number Publication Date
CN111555288A CN111555288A (en) 2020-08-18
CN111555288B true CN111555288B (en) 2021-09-03

Family

ID=72007401

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010278519.1A Active CN111555288B (en) 2020-04-10 2020-04-10 Track sensitivity-based secondary voltage control method and system for power system

Country Status (1)

Country Link
CN (1) CN111555288B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112994027B (en) * 2021-02-03 2023-02-03 国网河南省电力公司电力科学研究院 Method and device for configuring energy storage capacity under secondary reactive voltage control strategy

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102664417B (en) * 2012-04-26 2014-11-19 广东省电力调度中心 Control method and device for secondary voltage
US10235340B2 (en) * 2014-09-22 2019-03-19 Tsinghua University Method and apparatus for controlling reactive power of generator in power plant
CN108899940A (en) * 2018-07-09 2018-11-27 国网上海市电力公司 A kind of second level power plant control method of AVC
CN110011318B (en) * 2019-03-29 2022-08-30 中国电力科学研究院有限公司 Frequency and voltage coordination aid decision-making method and system based on track sensitivity

Also Published As

Publication number Publication date
CN111555288A (en) 2020-08-18

Similar Documents

Publication Publication Date Title
Feng et al. A comprehensive approach for preventive and corrective control to mitigate voltage collapse
CN110224410B (en) Power grid dynamic reactive power optimization configuration method based on transient voltage safety constraint
CN109638815B (en) Method for determining safety and stability prevention control strategy of medium-and-long-term voltage of power system
CN110829487B (en) Dynamic frequency prediction method for power system
CN111555288B (en) Track sensitivity-based secondary voltage control method and system for power system
CN103825269A (en) Rapid probabilistic load flow calculation method considering static power frequency characteristics of electric power system
Papangelis et al. A receding horizon approach to incorporate frequency support into the AC/DC converters of a multi-terminal DC grid
Wen et al. Application of a novel eigenvalue trajectory tracing method to identify both oscillatory stability margin and damping margin
CN110011318B (en) Frequency and voltage coordination aid decision-making method and system based on track sensitivity
CN112039133B (en) Method and system for carrying out coordinated control on active control and AGC
CN108494017B (en) Distributed coordination control method for autonomous micro-grid system based on inverter
Robak Robust SVC controller design and analysis for uncertain power systems
CN116418012A (en) Micro-grid transient stability emergency control method based on parameter rolling regulation and control
CN108306301B (en) Load flow calculation method applicable to rotor angle control mode
CN114296352B (en) Global stabilization control method and system for hypersonic aircraft
Zhang et al. Consensus-based state of charge dynamic equilibrium strategy in isolated DC microgrid with bus voltage regulation
CN115663908A (en) Transient stability analysis method and system for power synchronous control network type converter
CN115967098A (en) Subsynchronous damping control method based on model-free adaptive control
Song et al. Determination of load shedding for power-flow solvability using outage-continuation power flow (OCPF)
Manzoni et al. A comparison of power flow, full and fast dynamic simulations
Fan et al. An improved higher-order SFR model of large-scale distributed hybrid power system
CN111244960B (en) Method and system for determining splitting time based on transient energy
Xavier et al. Robust computation of voltage stability margins for transmission and distribution grids
Chang et al. Static Synchronous Compensator Control Strategy Using Voltage Sensitivity
CN114142489A (en) Wind-fire cooperative frequency modulation method for high-proportion new energy power grid considering heat storage dynamic state

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant