CN110350548A - Power system security based on UPFC stablizes online preventive control method, apparatus and system - Google Patents
Power system security based on UPFC stablizes online preventive control method, apparatus and system Download PDFInfo
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- CN110350548A CN110350548A CN201910715869.7A CN201910715869A CN110350548A CN 110350548 A CN110350548 A CN 110350548A CN 201910715869 A CN201910715869 A CN 201910715869A CN 110350548 A CN110350548 A CN 110350548A
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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
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
- H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
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- 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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
The invention discloses a kind of, and the power system security based on UPFC stablizes online preventive control method, apparatus and system, carries out security evaluation to forecast failure set based on power grid current operating conditions；To the safety and stability problem as caused by forecast failure found in security evaluation, prevention and control are carried out using UPFC series connection end active power controller or the series connection end UPFC and parallel connected end Reactive Power Control, the power system security based on UPFC is completed and stablizes online preventive control.The present invention carries out prevention and control for the forecast failure safety and stability problem found in power-management centre safety on line Stability Assessment, can expand UPFC system level function application range.
Description
Technical field
The invention belongs to power system automation technology fields, and in particular to a kind of power system security based on UPFC is steady
Determine online preventive control method, apparatus and system.
Background technique
Currently, Flexible AC transmission system (Flexible Alternative Current Transmission
System, FACTS) in the power system using increasingly extensive, THE UPFC (Unified Power Flow
Controller, UPFC) the flexible control means that combine a variety of FACTS devices, trend can be precisely controlled, be recognized
To be the most powerful FACTS element of most creative and function.
Academia is mostly focused on two aspect of modeling analysis and Unit Level control strategy for the research of UPFC.UPFC due to
Integrate the functions such as series and parallel, phase shift, there is power flowcontrol and voltage control function, can be used for idle work optimization control
System, but the active loss in subrange can only be effectively reduced in UPFC, with regard to the case where current UPFC is installed on a small quantity for it is traditional most
Excellent trend target is simultaneously not suitable for.The western looped network demonstration project in Nanjing uses a kind of control strategy for preventing line power out-of-limit, institute
The system-level control strategy formulated is preferential to guarantee power flowcontrol target under power grid normal operating condition；N-1 event occurs in system
It is preferential to guarantee that route is no more than its power limit when hindering or leading to circuit overload because of operating condition change, but mentioned strategy lacks normally
The power setting principle of operating status and steady-state optimization.In addition, also having pertinent literature to propose improves section load balancing degrees
UPFC tide optimization method, and using UPFC route it is active/reactive power flow control and parallel inverter Reactive Power Control
Realize the feasibility that other transmission line of electricity premature beats and ac bus voltage are adjusted, but precondition is that UPFC need to access a distant place
Electrical measurement signal is controlled, and is not yet realized in current Practical Project, and engineering experience is still immature.In general,
It is still necessary to further study for the system-level control strategy of UPFC.
Summary of the invention
In view of the above-mentioned problems, the present invention proposes that a kind of power system security based on UPFC stablizes online preventive control side
Method, apparatus and system, using UPFC route series connection end it is active/reactive power flow control and parallel connected end reactive power control capability,
Prevention and control are carried out for the forecast failure safety and stability problem found in the safety on line Stability Assessment of power-management centre, into one
Step has expanded UPFC system level function application range.
In order to achieve the above technical purposes, reach above-mentioned technical effect, the invention is realized by the following technical scheme:
In a first aspect, the present invention provides a kind of, the power system security based on UPFC stablizes online preventive control method,
Include:
Security evaluation is carried out to forecast failure set based on power grid current operating conditions；
To the safety and stability problem as caused by forecast failure found in security evaluation, UPFC series connection end active power is utilized
Control or the series connection end UPFC and parallel connected end Reactive Power Control carry out prevention and control, and it is steady to complete the power system security based on UPFC
Determine online preventive control.
Optionally, the prevention and control are as follows: overload prevention and control, transient voltage safe and stable prevention and control or static state
Any one of voltage security prevention and control；
Or the prevention and control be sequentially carry out overload prevention and control, transient voltage safe and stable prevention and control and
Static Voltage Security prevention and control, wherein latter control is carried out on the basis of previous control, after control measure are used as by before
The initial conditions of continuous control re-start safety and stability evaluation calculating, and final control measure is taken to arrange as comprehensive prevention control
Apply output.
Optionally, in the overload prevention and control:
It is described to the safety and stability problem as caused by forecast failure found in security evaluation, it is active using UPFC series connection end
Power control carries out prevention and control, specifically:
When finding the non-installation UPFC circuit overload as caused by forecast failure in Static security assessment, then promoted same
UPFC active power controller value in passway for transmitting electricity, until circuit overload problem disappears.
Optionally, described to promote UPFC active power controller value in same passway for transmitting electricity, until circuit overload problem disappears,
Specifically:
Sensitivity of the UPFC active power controller value to overload line power after calculating forecast failure, and sensitivity is greater than
As effective control measure, the UPFC for being less than threshold value for sensitivity is no longer participate in the UPFC active power controller value of threshold value
Subsequent control；
Overload route active power overload quantity is obtained into the lifting capacity of UPFC active power controller value divided by the sensitivity,
And UPFC active power controller value in same passway for transmitting electricity is promoted based on the lifting capacity, realize that circuit overload problem disappears.
Optionally, the sensitivity of the UPFC active power controller value to overload line power after calculating forecast failure, tool
Body are as follows:
The variable quantity of UPFC active power controller value is equivalent to the both ends UPFC active power injection rate, by calculating UPFC
Sensitivity of the both ends active power injection rate to overload line power obtains UPFC active power controller value to overload line power
Sensitivity.
Optionally, the variable quantity by UPFC active power controller value is equivalent to the both ends UPFC active power injection rate,
By calculating sensitivity of the both ends the UPFC active power injection rate to overload line power, UPFC active power controller value pair is obtained
The sensitivity for overloading line power, specifically includes:
The series connection equivalent ideal voltage source in end of UPFC caused by UPFC active power controller value variable quantity is calculated by formula (1)
Voltage variety:
Wherein:
In formula,For the UPFC series connection equivalent ideal voltage source voltage variety in end, Δ Isex,ΔIseyRespectively UPFC string
Join the real and imaginary parts of end current change quantity, RL,XLRespectively UPFC line resistance and reactance, Vix,ViyRespectively UPFC route
The real and imaginary parts of head end voltage, Vjx,VjyThe respectively real and imaginary parts of UPFC line end voltage, Δ PcFor UPFC wattful power
Rate controlling value variable quantity；
The UPFC series connection equivalent active injection power in end is calculated by formula (2):
In formula, Δ Sip,ΔSjpThe respectively equivalent active injection power of UPFC route head end and end；
Simultaneous solution formula (1) and (2) are calculating spirit of the UPFC route both ends active power injection rate to overload line power
On the basis of sensitivity, sensitivity of the UPFC active power controller value to overload line power can be obtained.
Optionally, described to be promoted in same passway for transmitting electricity after UPFC active power controller value step, it further include that synthesis is more
Lifting capacity after a forecast failure as final Control Measure, specifically includes the following steps:
For a plurality of overload route after multiple forecast failures, each overload route, which can get its corresponding UPFC, to be had
The lifting capacity of function power control value；
If the lifting capacity of UPFC active power controller value is greater than active power controller maximum changing value, it is set to permission
Active power controller maximum changing value；
For a certain UPFC, the maximum value for being solved the active power controller value lifting capacity of different overload routes, which is used as, is somebody's turn to do
The final Control Measure of UPFC.
Optionally, the active power controller maximum changing value is obtained by following steps:
By the given UPFC series connection equivalent ideal voltage source maximum voltage V in endsemaxIt subtracts current voltage and obtains Δ Vsemax,
Formula (1) left side is substituted into, and then Δ P is obtained by solution formula (1)cAs UPFC active power controller maximum changing value:
Wherein:
In formula,For the UPFC series connection equivalent ideal voltage source voltage variety in end, Δ Isex,ΔIseyRespectively UPFC string
Join the real and imaginary parts of end current change quantity, RL,XLRespectively UPFC line resistance and reactance, Vix,ViyRespectively UPFC route
The real and imaginary parts of head end voltage, Vjx,VjyThe respectively real and imaginary parts of UPFC line end voltage, Δ PcFor UPFC wattful power
Rate controlling value variable quantity.
Optionally, in the transient voltage safe and stable prevention and control:
It is described to the safety and stability problem as caused by forecast failure found in security evaluation, connected end and simultaneously using UPFC
Join end Reactive Power Control and carry out prevention and control, specifically:
When the transient voltage safe and stable nargin obtained based on transient voltage safe and stable assessment is less than threshold value, calculate
The series connection end UPFC and parallel connected end Reactive Power Control value are to the idle of the weak node for being unsatisfactory for transient voltage safe and stable requirement
Voltage sensibility arranges sensitivity greater than the series connection end UPFC of threshold value or parallel connected end Reactive Power Control value as effective control
It applies, the UPFC for being less than threshold value for sensitivity is no longer participate in subsequent control；
By the series connection end the UPFC and parallel connected end Reactive Power Control value according to control essence between current value and maximum value
Degree requires to be divided into multiple gears, if series connection end and parallel connected end Reactive Power Control value are effective control measure, basis
The sum of the two Reactive Power Control value divides gear, and by Reactive Power Control value according to the series connection end UPFC and the idle function of parallel connected end
The reactive voltage level of sensitivity of rate controlling value is allocated；The promotion of end or parallel connected end Reactive Power Control value if UPFC connects
Amount is greater than Reactive Power Control maximum changing value, then is set to the Reactive Power Control maximum changing value of permission；
For multiple gears of UPFC Reactive Power Control value, UPFC Reactive Power Control value is set to each gear pair respectively
The Reactive Power Control value answered carries out transient voltage safe and stable assessment later and checks, chooses security margin and meet the requirements
And the variation of Reactive Power Control value is minimum or the maximum UPFC Reactive Power Control value gear of security margin improvement is corresponding
Control measure of the Reactive Power Control value as the failure.
Optionally, it is described calculate UPFC series connection end Reactive Power Control value to be unsatisfactory for transient voltage safe and stable requirement
The reactive voltage sensitivity of weak node, specifically:
The variable quantity of UPFC series connection end Reactive Power Control value is equivalent to UPFC route both ends reactive power injection rate, is led to
The sensitivity for calculating UPFC route both ends reactive power injection rate to voltage weak node voltage is crossed, UPFC route series connection end is obtained
Sensitivity of the Reactive Power Control value to voltage weak node voltage；
Optionally, the variable quantity by UPFC series connection end Reactive Power Control value is equivalent to the idle function in UPFC route both ends
Rate injection rate is obtained by calculating sensitivity of the UPFC route both ends reactive power injection rate to voltage weak node voltage
Sensitivity of the UPFC route series connection end Reactive Power Control value to voltage weak node voltage, specifically:
It is equivalent that UPFC series connection end caused by UPFC series connection end Reactive Power Control value variable quantity is calculated by following formula (3)
Ideal voltage source voltage variety:
Wherein:
In formula, Δ QcFor UPFC series connection end Reactive Power Control value variable quantity；
The UPFC series connection equivalent idle injecting power in end is calculated by following formula (4):
In formula, Δ Siq,ΔSjqThe respectively equivalent idle injecting power of UPFC route head end and end；
Simultaneous solution formula (3) and (4) are calculating UPFC route both ends reactive power injection rate to voltage weak node voltage
On the basis of sensitivity, sensitivity of the UPFC route series connection end Reactive Power Control value to voltage weak node voltage can be obtained；
The Reactive Power Control maximum changing value is obtained by following steps:
By the given UPFC series connection equivalent ideal voltage source maximum voltage V in endsemaxIt subtracts current voltage and obtains Δ Vsemax,
Formula (3) left side is substituted into, and then obtains Δ Q by solution formula (3)cAs UPFC series connection end Reactive Power Control maximum variation
Value, UPFC parallel connected end Reactive Power Control maximum changing value are that the parallel connected end Reactive Power Control maximum value allowed subtracts currently
Value.
Optionally, the method also includes: control measure of comprehensive multiple forecast failures as final Control Measure,
Specifically:
For multiple voltage weak nodes after multiple forecast failures, it is corresponding that each forecast failure can get its
The lifting capacity of UPFC Reactive Power Control value；
For a certain UPFC, series connection end and the parallel connected end Reactive Power Control value lifting capacity of different forecast failures are solved
Maximum value as the UPFC series connection end and parallel connected end Reactive Power Control value final Control Measure.
Optionally, in the Static Voltage Security prevention and control:
It is described to the safety and stability problem as caused by forecast failure found in security evaluation, connected end and simultaneously using UPFC
Join end Reactive Power Control and carry out prevention and control, specifically:
When the Static Voltage Security nargin obtained based on Static Voltage Security assessment is less than threshold value, UPFC series connection is calculated
End and reactive voltage sensitivity of the parallel connected end Reactive Power Control value to the weak node for being unsatisfactory for Static Voltage Security requirement, will
Sensitivity be greater than threshold value UPFC series connection end or parallel connected end Reactive Power Control value as effective control measure, for sensitivity
UPFC less than threshold value is no longer participate in subsequent control；
By the series connection end UPFC to be asked and parallel connected end Reactive Power Control value according to control between current value and maximum value
Required precision is divided into multiple gears, if series connection end and parallel connected end Reactive Power Control value are effective control measure, root
Gear is divided according to the sum of the two Reactive Power Control value, and Reactive Power Control value is idle according to the series connection end UPFC and parallel connected end
The reactive voltage level of sensitivity of power control value is allocated；If the series connection end UPFC or parallel connected end Reactive Power Control value mention
Rising amount is greater than the Reactive Power Control maximum changing value, then is set to the Reactive Power Control maximum changing value of permission；
For multiple gears of UPFC Reactive Power Control value, UPFC Reactive Power Control value is set to each gear pair respectively
The Reactive Power Control value answered carries out Static Voltage Security assessment later and checks, and selection safety margin is met the requirements and idle function
The variation of rate controlling value is minimum or safety margin improves the corresponding Reactive Power Control of maximum UPFC Reactive Power Control value gear
It is worth the control measure as the failure.
Optionally, the method also includes: control measure of comprehensive multiple forecast failures as final Control Measure,
Specifically:
For multiple voltage weak nodes after multiple forecast failures, it is corresponding that each forecast failure can get its
The lifting capacity of UPFC Reactive Power Control value；
For a certain UPFC, series connection end and the parallel connected end Reactive Power Control value lifting capacity of different forecast failures are solved
Maximum value as the UPFC series connection end and parallel connected end Reactive Power Control value final Control Measure.
Second aspect, the present invention provides a kind of, and the power system security based on UPFC stablizes online preventive control device,
Include:
Evaluation module, for carrying out security evaluation to forecast failure set based on power grid current operating conditions；
Prevention and control module, for utilizing to the safety and stability problem as caused by forecast failure found in security evaluation
UPFC series connection end active power controller or the series connection end UPFC and parallel connected end Reactive Power Control carry out prevention and control, complete to be based on
The power system security of UPFC stablizes online preventive control.
Optionally, the prevention and control module is overload prevention and control module, the pre- prevention and control of transient voltage safe and stable
Any one of molding block or Static Voltage Security prevention and control module；
Or the carry out overload prevention and control module including being sequentially connected, transient voltage safe and stable prevention and control mould
Block and Static Voltage Security prevention and control module, wherein latter control module is carried out on the basis of previous control module, by it
Initial conditions of the preceding control measure as subsequent control need to re-start safety and stability evaluation calculating, final control are taken to arrange
It applies as the output of comprehensive prevention control measure.
The third aspect, the present invention provides a kind of, and the power system security based on UPFC stablizes online preventive control system,
Include:
Processor is adapted for carrying out each instruction；And
Equipment is stored, is suitable for storing a plurality of instruction, described instruction is suitable for being loaded by processor and being executed in first aspect and appoint
Step described in one.
Compared with prior art, beneficial effects of the present invention:
The invention proposes a kind of power system securities based on UPFC that can be applied in electric system to stablize online
Prevention and control method, apparatus and system, based on UPFC active power controller value after forecast failure to the sensitive of overload line power
Degree, which calculates, obtains controlling value lifting capacity, can use UPFC series connection end active power controller function and realizes the pre- prevention and control of overload
System；Stablize the reactive voltage spirit of weak node to voltage security based on UPFC route series connection end and parallel connected end Reactive Power Control value
Sensitivity, the effective control measure of calculating sifting, behind UPFC route series connection end and the proportional assignment of parallel connected end Reactive Power Control value
It is divided into multiple gears and carries out safety and stability evaluation check, realize transient voltage safe and stable prevention and control and quiescent voltage peace
Full prevention and control；When there are a variety of safety and stability problems simultaneously after forecast failure, controls to meet by comprehensive prevention and coordinate control
The requirement of system.It is asked using the present invention for the forecast failure safety and stability found in power-management centre safety on line Stability Assessment
Topic carries out prevention and control, can further expand UPFC system level function application range.
Detailed description of the invention
In order that the present invention can be more clearly and readily understood, right below according to specific embodiment and in conjunction with attached drawing
The present invention is described in further detail, in which:
Fig. 1 is that a kind of power system security based on UPFC of an embodiment of the present invention stablizes online preventive control method
Flow diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
It limits the scope of protection of the present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
Embodiment 1
As shown in Figure 1, providing a kind of stable online prevention of the power system security based on UPFC in the embodiment of the present invention
Control method, comprising the following steps:
(1) security evaluation is carried out to forecast failure set based on power grid current operating conditions；
(2) active using UPFC series connection end to the safety and stability problem as caused by forecast failure found in security evaluation
Power control or the series connection end UPFC and parallel connected end Reactive Power Control carry out prevention and control, complete the electric system peace based on UPFC
It is complete to stablize online preventive control.
In the first specific embodiment of the embodiment of the present invention, the prevention and control are overload prevention and control,
It is described to the safety and stability problem as caused by forecast failure found in security evaluation in the overload prevention and control,
Prevention and control are carried out using UPFC series connection end active power controller, specifically:
When finding the non-installation UPFC circuit overload as caused by forecast failure in Static security assessment, then promoted same
UPFC active power controller value in passway for transmitting electricity, until circuit overload problem disappears.
Preferably, described to promote UPFC active power controller value in same passway for transmitting electricity, until circuit overload problem disappears,
Specifically:
Sensitivity of the UPFC active power controller value to overload line power after calculating forecast failure, and sensitivity is greater than
As effective control measure, the UPFC for being less than threshold value for sensitivity is no longer participate in the UPFC active power controller value of threshold value
Subsequent control；
Overload route active power overload quantity is obtained into the lifting capacity of UPFC active power controller value divided by the sensitivity,
And UPFC active power controller value in same passway for transmitting electricity is promoted based on the lifting capacity, realize that circuit overload problem disappears.
Sensitivity of the UPFC active power controller value to overload line power after the calculating forecast failure, specifically:
The variable quantity of UPFC active power controller value is equivalent to the both ends UPFC active power injection rate, by calculating UPFC
Sensitivity of the both ends active power injection rate to overload line power obtains UPFC active power controller value to overload line power
Sensitivity, more specifically:
The series connection equivalent ideal voltage source in end of UPFC caused by UPFC active power controller value variable quantity is calculated by formula (1)
Voltage variety:
Wherein:
In formula,For the UPFC series connection equivalent ideal voltage source voltage variety in end, Δ Isex,ΔIseyRespectively UPFC string
Join the real and imaginary parts of end current change quantity, RL,XLRespectively UPFC line resistance and reactance, Vix,ViyRespectively UPFC route
The real and imaginary parts of head end voltage, Vjx,VjyThe respectively real and imaginary parts of UPFC line end voltage, Δ PcFor UPFC wattful power
Rate controlling value variable quantity.
The UPFC series connection equivalent active injection power in end is calculated by formula (2):
In formula, Δ Sip,ΔSjpThe respectively equivalent active injection power of UPFC route head end and end.
Simultaneous solution formula (1) and (2) are calculating spirit of the UPFC route both ends active power injection rate to overload line power
On the basis of sensitivity, sensitivity of the UPFC route active power controller value to overload line power can be obtained.
In addition, by the given UPFC series connection equivalent ideal voltage source maximum voltage V in endsemaxIt subtracts current voltage and obtains Δ
Vsemax, formula (1) left side is substituted into, and then Δ P is obtained by solution formula (1)cAs UPFC active power controller maximum changing value.
Further, described to be promoted in same passway for transmitting electricity after UPFC active power controller value step, it further include synthesis
Lifting capacity after multiple forecast failures as final Control Measure, specifically includes the following steps:
For a plurality of overload route after multiple forecast failures, each overload route, which can get its corresponding UPFC, to be had
The lifting capacity of function power control value；
If the lifting capacity of UPFC active power controller value is greater than the active power controller maximum changing value, set
For the active power controller maximum changing value of permission；
For a certain UPFC, the maximum value for being solved the active power controller value lifting capacity of different overload routes, which is used as, is somebody's turn to do
The final Control Measure of UPFC.
In second of specific embodiment of the embodiment of the present invention, the prevention and control are that transient voltage safe and stable is pre-
Anti- control, in the transient voltage safe and stable prevention and control:
It is described to the safety and stability problem as caused by forecast failure found in security evaluation, connected end and simultaneously using UPFC
Join end Reactive Power Control and carry out prevention and control, specifically:
When the transient voltage safe and stable nargin obtained based on transient voltage safe and stable assessment is less than threshold value, calculate
The series connection end UPFC and parallel connected end Reactive Power Control value are to the idle of the weak node for being unsatisfactory for transient voltage safe and stable requirement
Voltage sensibility arranges sensitivity greater than the series connection end UPFC of threshold value or parallel connected end Reactive Power Control value as effective control
It applies, the UPFC for being less than threshold value for sensitivity is no longer participate in subsequent control；
By the series connection end the UPFC and parallel connected end Reactive Power Control value according to control essence between current value and maximum value
Degree requires to be divided into multiple gears, if series connection end and parallel connected end Reactive Power Control value are effective control measure, basis
The sum of the two Reactive Power Control value divides gear, and by Reactive Power Control value according to the series connection end UPFC and the idle function of parallel connected end
The reactive voltage level of sensitivity of rate controlling value is allocated；The promotion of end or parallel connected end Reactive Power Control value if UPFC connects
Amount is greater than Reactive Power Control maximum changing value, then is set to the Reactive Power Control maximum changing value of permission；
For multiple gears of UPFC Reactive Power Control value, UPFC Reactive Power Control value is set to each gear pair respectively
The Reactive Power Control value answered carries out transient voltage safe and stable assessment later and checks, chooses security margin and meet the requirements
And the variation of Reactive Power Control value is minimum or the maximum UPFC Reactive Power Control value gear of security margin improvement is corresponding
Control measure of the Reactive Power Control value as the failure.
The UPFC series connection end Reactive Power Control value that calculates is to the weak section for being unsatisfactory for transient voltage safe and stable requirement
The reactive voltage sensitivity of point is therefore the prior art is not done in the embodiment of the present invention and excessively repeated；The calculating UPFC series connection
Reactive voltage sensitivity of the end Reactive Power Control value to the weak node for being unsatisfactory for transient voltage safe and stable requirement, specifically
Are as follows:
The variable quantity of UPFC series connection end Reactive Power Control value is equivalent to UPFC route both ends reactive power injection rate, is led to
The sensitivity for calculating UPFC route both ends reactive power injection rate to voltage weak node voltage is crossed, UPFC route series connection end is obtained
Sensitivity of the Reactive Power Control value to voltage weak node voltage；Specifically:
It is equivalent that UPFC series connection end caused by UPFC series connection end Reactive Power Control value variable quantity is calculated by following formula (3)
Ideal voltage source voltage variety:
Wherein:
In formula, Δ QcFor UPFC series connection end Reactive Power Control value variable quantity；
The UPFC series connection equivalent idle injecting power in end is calculated by following formula (4):
In formula, Δ Siq,ΔSjqThe respectively equivalent idle injecting power of UPFC route head end and end；
Simultaneous solution formula (3) and (4) are calculating UPFC route both ends reactive power injection rate to voltage weak node voltage
On the basis of sensitivity, sensitivity of the UPFC route series connection end Reactive Power Control value to voltage weak node voltage can be obtained；
The Reactive Power Control maximum changing value is obtained by following steps:
By the given UPFC series connection equivalent ideal voltage source maximum voltage V in endsemaxIt subtracts current voltage and obtains Δ Vsemax,
Formula (3) left side is substituted into, and then obtains Δ Q by solution formula (3)cAs UPFC series connection end Reactive Power Control maximum variation
Value, UPFC parallel connected end Reactive Power Control maximum changing value are that the parallel connected end Reactive Power Control maximum value allowed subtracts currently
Value.
Further, the method also includes: the control measure of comprehensive multiple forecast failures are arranged as final prevention and control
It applies, specifically:
For multiple voltage weak nodes after multiple forecast failures, it is corresponding that each forecast failure can get its
The lifting capacity of UPFC Reactive Power Control value；
For a certain UPFC, series connection end and the parallel connected end Reactive Power Control value lifting capacity of different forecast failures are solved
Maximum value as the UPFC series connection end and parallel connected end Reactive Power Control value final Control Measure.
For example, if UPFC route series connection end and parallel connected end Reactive Power Control value are to the sensitive of voltage weak node voltage
Degree is simultaneously greater than threshold value, then UPFC route series connection end and parallel connected end Reactive Power Control value be effective control measure and simultaneously
Control is participated in, needs to coordinate the two.By idle controlling value according to UPFC route series connection end and parallel connected end reactive power control
Value processed is allocated the level of sensitivity of voltage weak node voltage, i.e. Δ Qc:ΔQsh=Sq.c:Sq.sh, wherein Δ QcFor
The UPFC series connection idle controlling value variable quantity in end, Sq.cFor its sensitivity to voltage weak node voltage；ΔQshFor UPFC parallel connected end
Idle controlling value variable quantity, Sq.shFor its sensitivity to voltage weak node voltage.
In the third specific embodiment of the embodiment of the present invention, the prevention and control are the pre- prevention and control of Static Voltage Security
System is stablized in prevention and control in the Static Voltage Security:
It is described to the safety and stability problem as caused by forecast failure found in security evaluation, connected end and simultaneously using UPFC
Join end Reactive Power Control and carry out prevention and control, specifically:
When the Static Voltage Security nargin obtained based on Static Voltage Security assessment is less than threshold value, UPFC series connection is calculated
End and reactive voltage sensitivity of the parallel connected end Reactive Power Control value to the weak node for being unsatisfactory for Static Voltage Security requirement, will
Sensitivity be greater than threshold value UPFC series connection end or parallel connected end Reactive Power Control value as effective control measure, for sensitivity
UPFC less than threshold value is no longer participate in subsequent control；
By the series connection end UPFC to be asked and parallel connected end Reactive Power Control value according to control between current value and maximum value
Required precision is divided into multiple gears, if series connection end and parallel connected end Reactive Power Control value are effective control measure, root
Gear is divided according to the sum of the two Reactive Power Control value, and Reactive Power Control value is idle according to the series connection end UPFC and parallel connected end
The reactive voltage level of sensitivity of power control value is allocated；If the series connection end UPFC or parallel connected end Reactive Power Control value mention
Rising amount is greater than the Reactive Power Control maximum changing value, then is set to the Reactive Power Control maximum changing value of permission；
For multiple gears of UPFC Reactive Power Control value, UPFC Reactive Power Control value is set to each gear pair respectively
The Reactive Power Control value answered carries out Static Voltage Security assessment later and checks, and selection safety margin is met the requirements and idle function
The variation of rate controlling value is minimum or safety margin improves the corresponding Reactive Power Control of maximum UPFC Reactive Power Control value gear
It is worth the control measure as the failure.
Preferably, the method also includes: control measure of comprehensive multiple forecast failures as final Control Measure,
Specifically:
For multiple voltage weak nodes after multiple forecast failures, it is corresponding that each forecast failure can get its
The lifting capacity of UPFC Reactive Power Control value；
For a certain UPFC, series connection end and the parallel connected end Reactive Power Control value lifting capacity of different forecast failures are solved
Maximum value as the UPFC series connection end and parallel connected end Reactive Power Control value final Control Measure.
In the 4th kind of specific embodiment of the embodiment of the present invention, the prevention and control are that sequentially progress overload is pre-
Anti- control, transient voltage safe and stable prevention and control and Static Voltage Security prevention and control, wherein latter control is in previous control
It is carried out on the basis of system, using control measure before as the initial conditions of subsequent control, needs to re-start safety and stability evaluation meter
It calculates, final control measure is taken to export as comprehensive prevention control measure.
Embodiment 2
Based on inventive concept same as Example 1, a kind of power train based on UPFC is provided in the embodiment of the present invention
System safety and stability online preventive control device, comprising:
Evaluation module, for carrying out security evaluation to forecast failure set based on power grid current operating conditions；
Prevention and control module, for utilizing to the safety and stability problem as caused by forecast failure found in security evaluation
UPFC series connection end active power controller or the series connection end UPFC and parallel connected end Reactive Power Control carry out prevention and control, complete to be based on
The power system security of UPFC stablizes online preventive control.
Preferably, the prevention and control module are as follows: overload prevention and control module, the pre- prevention and control of transient voltage safe and stable
Any one of molding block or Static Voltage Security prevention and control module；
Or the overload prevention and control module including being sequentially connected, transient voltage safe and stable prevention and control module and
Static Voltage Security prevention and control module, wherein latter control module is carried out on the basis of previous control module, will be controlled before
Initial conditions of the measure processed as subsequent control need to re-start safety and stability evaluation calculating, final control measure are taken to make
For the output of comprehensive prevention control measure.
Preferably, in the overload prevention and control module:
It is described to the safety and stability problem as caused by forecast failure found in security evaluation, it is active using UPFC series connection end
Power control carries out prevention and control, specifically:
When finding the non-installation UPFC circuit overload as caused by forecast failure in Static security assessment, then promoted same
UPFC active power controller value in passway for transmitting electricity, until circuit overload problem disappears.
Preferably, described to promote UPFC active power controller value in same passway for transmitting electricity, until circuit overload problem disappears,
Specifically:
Sensitivity of the UPFC active power controller value to overload line power after calculating forecast failure, and sensitivity is greater than
As effective control measure, the UPFC for being less than threshold value for sensitivity is no longer participate in the UPFC active power controller value of threshold value
Subsequent control；
Overload route active power overload quantity is obtained into the lifting capacity of UPFC active power controller value divided by the sensitivity,
And UPFC active power controller value in same passway for transmitting electricity is promoted based on the lifting capacity, realize that circuit overload problem disappears.
Preferably, described to be promoted in same passway for transmitting electricity after UPFC active power controller value step, it further include that synthesis is more
Lifting capacity after a forecast failure as final Control Measure, specifically includes the following steps:
For a plurality of overload route after multiple forecast failures, each overload route, which can get its corresponding UPFC, to be had
The lifting capacity of function power control value；
If the lifting capacity of UPFC active power controller value is greater than active power controller maximum changing value, it is set to permission
Active power controller maximum changing value；
For a certain UPFC, the maximum value for being solved the active power controller value lifting capacity of different overload routes, which is used as, is somebody's turn to do
The final Control Measure of UPFC.
Preferably, in the transient voltage safe and stable prevention and control module:
It is described to the safety and stability problem as caused by forecast failure found in security evaluation, connected end and simultaneously using UPFC
Join end Reactive Power Control and carry out prevention and control, specifically:
When the transient voltage safe and stable nargin obtained based on transient voltage safe and stable assessment is less than threshold value, calculate
The series connection end UPFC and parallel connected end Reactive Power Control value are to the idle of the weak node for being unsatisfactory for transient voltage safe and stable requirement
Voltage sensibility arranges sensitivity greater than the series connection end UPFC of threshold value or parallel connected end Reactive Power Control value as effective control
It applies, the UPFC for being less than threshold value for sensitivity is no longer participate in subsequent control；
By the series connection end the UPFC and parallel connected end Reactive Power Control value according to control essence between current value and maximum value
Degree requires to be divided into multiple gears, if series connection end and parallel connected end Reactive Power Control value are effective control measure, basis
The sum of the two Reactive Power Control value divides gear, and by Reactive Power Control value according to the series connection end UPFC and the idle function of parallel connected end
The reactive voltage level of sensitivity of rate controlling value is allocated；The promotion of end or parallel connected end Reactive Power Control value if UPFC connects
Amount is greater than Reactive Power Control maximum changing value, then is set to the Reactive Power Control maximum changing value of permission；
For multiple gears of UPFC Reactive Power Control value, UPFC Reactive Power Control value is set to each gear pair respectively
The Reactive Power Control value answered carries out transient voltage safe and stable assessment later and checks, chooses security margin and meet the requirements
And the variation of Reactive Power Control value is minimum or the maximum UPFC Reactive Power Control value gear of security margin improvement is corresponding
Control measure of the Reactive Power Control value as the failure.
Preferably, the method also includes: control measure of comprehensive multiple forecast failures as final Control Measure,
Specifically:
For multiple voltage weak nodes after multiple forecast failures, it is corresponding that each forecast failure can get its
The lifting capacity of UPFC Reactive Power Control value；
For a certain UPFC, series connection end and the parallel connected end Reactive Power Control value lifting capacity of different forecast failures are solved
Maximum value as the UPFC series connection end and parallel connected end Reactive Power Control value final Control Measure.
Preferably, stablize in prevention and control module in the Static Voltage Security:
It is described to the safety and stability problem as caused by forecast failure found in security evaluation, connected end and simultaneously using UPFC
Join end Reactive Power Control and carry out prevention and control, specifically:
When the Static Voltage Security nargin obtained based on Static Voltage Security assessment is less than threshold value, UPFC series connection is calculated
End and reactive voltage sensitivity of the parallel connected end Reactive Power Control value to the weak node for being unsatisfactory for Static Voltage Security requirement, will
Sensitivity be greater than threshold value UPFC series connection end or parallel connected end Reactive Power Control value as effective control measure, for sensitivity
UPFC less than threshold value is no longer participate in subsequent control；
By the series connection end UPFC to be asked and parallel connected end Reactive Power Control value according to control between current value and maximum value
Required precision is divided into multiple gears, if series connection end and parallel connected end Reactive Power Control value are effective control measure, root
Gear is divided according to the sum of the two Reactive Power Control value, and Reactive Power Control value is idle according to the series connection end UPFC and parallel connected end
The reactive voltage level of sensitivity of power control value is allocated；If the series connection end UPFC or parallel connected end Reactive Power Control value mention
Rising amount is greater than the Reactive Power Control maximum changing value, then is set to the Reactive Power Control maximum changing value of permission；
Preferably, the method also includes: control measure of comprehensive multiple forecast failures as final Control Measure,
Specifically:
For multiple voltage weak nodes after multiple forecast failures, it is corresponding that each forecast failure can get its
The lifting capacity of UPFC Reactive Power Control value；
For a certain UPFC, series connection end and the parallel connected end Reactive Power Control value lifting capacity of different forecast failures are solved
Maximum value as the UPFC series connection end and parallel connected end Reactive Power Control value final Control Measure.
Embodiment 3
Based on inventive concept same as Example 1, a kind of power train based on UPFC is provided in the embodiment of the present invention
System safety and stability online preventive control system, comprising:
Processor is adapted for carrying out each instruction；And
Equipment is stored, is suitable for storing a plurality of instruction, described instruction is suitable for being loaded by processor and being executed any in embodiment 1
Step described in.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (17)
1. a kind of power system security based on UPFC stablizes online preventive control method characterized by comprising
Security evaluation is carried out to forecast failure set based on power grid current operating conditions；
To the safety and stability problem as caused by forecast failure found in security evaluation, UPFC series connection end active power controller is utilized
Or the series connection end UPFC and parallel connected end Reactive Power Control carry out prevention and control, complete the power system security based on UPFC and stablize
Line prevention and control.
2. a kind of power system security based on UPFC according to claim 1 stablizes online preventive control method, special
Sign is, the prevention and control are as follows: overload prevention and control, transient voltage safe and stable prevention and control or Static Voltage Security
Any one of prevention and control；
Or the prevention and control are sequentially to carry out overload prevention and control, transient voltage safe and stable prevention and control and static state
Voltage security prevention and control, wherein latter control is carried out on the basis of previous control, and control measure are as subsequent control by before
The initial conditions of system re-start safety and stability evaluation calculating, take final control measure defeated as comprehensive prevention control measure
Out.
3. a kind of power system security based on UPFC according to claim 2 stablizes online preventive control method, special
Sign is, in the overload prevention and control:
It is described to the safety and stability problem as caused by forecast failure found in security evaluation, utilize UPFC to connect end active power
Control carries out prevention and control, specifically:
When finding the non-installation UPFC circuit overload as caused by forecast failure in Static security assessment, then same transmission of electricity is promoted
UPFC active power controller value in channel, until circuit overload problem disappears.
4. a kind of power system security based on UPFC according to claim 3 stablizes online preventive control method, special
Sign is: it is described to promote UPFC active power controller value in same passway for transmitting electricity, until circuit overload problem disappears, specifically:
Sensitivity of the UPFC active power controller value to overload line power after calculating forecast failure, and sensitivity is greater than threshold
The UPFC active power controller value of value is no longer participate in the UPFC that sensitivity is less than threshold value subsequent as effective control measure
Control；
Overload route active power overload quantity is obtained into the lifting capacity of UPFC active power controller value, and base divided by the sensitivity
UPFC active power controller value in same passway for transmitting electricity is promoted in the lifting capacity, realizes that circuit overload problem disappears.
5. a kind of power system security based on UPFC according to claim 4 stablizes online preventive control method, special
Sign is: the sensitivity of the UPFC active power controller value to overload line power after calculating forecast failure, specifically:
The variable quantity of UPFC active power controller value is equivalent to the both ends UPFC active power injection rate, by calculating the both ends UPFC
Sensitivity of the active power injection rate to overload line power obtains spirit of the UPFC active power controller value to overload line power
Sensitivity.
6. a kind of power system security based on UPFC according to claim 5 stablizes online preventive control method, special
Sign is: the variable quantity by UPFC active power controller value is equivalent to the both ends UPFC active power injection rate, passes through calculating
Sensitivity of the both ends the UPFC active power injection rate to overload line power obtains UPFC active power controller value to overload route
The sensitivity of power, specifically includes:
The series connection equivalent ideal voltage source voltage in end of UPFC caused by UPFC active power controller value variable quantity is calculated by formula (1)
Variable quantity:
Wherein:
In formula,For the UPFC series connection equivalent ideal voltage source voltage variety in end, Δ Isex,ΔIseyRespectively UPFC series connection end
The real and imaginary parts of current change quantity, RL,XLRespectively UPFC line resistance and reactance, Vix,ViyRespectively UPFC route head end
The real and imaginary parts of voltage, Vjx,VjyThe respectively real and imaginary parts of UPFC line end voltage, Δ PcFor UPFC active power control
Value variable quantity processed；
The UPFC series connection equivalent active injection power in end is calculated by formula (2):
In formula, Δ Sip,ΔSjpThe respectively equivalent active injection power of UPFC route head end and end；
Simultaneous solution formula (1) and (2) are calculating sensitivity of the UPFC route both ends active power injection rate to overload line power
On the basis of, it can be obtained sensitivity of the UPFC active power controller value to overload line power.
7. a kind of power system security based on UPFC according to claim 4 stablizes online preventive control method, special
Sign is: it is described to be promoted in same passway for transmitting electricity after UPFC active power controller value step, it further include comprehensive multiple anticipation events
Lifting capacity after barrier as final Control Measure, specifically includes the following steps:
For a plurality of overload route after multiple forecast failures, each overload route can get its corresponding UPFC wattful power
The lifting capacity of rate controlling value；
If the lifting capacity of UPFC active power controller value is greater than active power controller maximum changing value, be set to permission has
Function power control maximum changing value；
For a certain UPFC, the maximum value of the active power controller value lifting capacity of different overload routes is solved as the UPFC
Final Control Measure.
8. a kind of power system security based on UPFC according to claim 7 stablizes online preventive control method, special
Sign is that the active power controller maximum changing value is obtained by following steps:
By the given UPFC series connection equivalent ideal voltage source maximum voltage V in endsemaxIt subtracts current voltage and obtains Δ Vsemax, substitute into public
Formula (1) left side, and then Δ P is obtained by solution formula (1)cAs UPFC active power controller maximum changing value:
Wherein:
In formula,For the UPFC series connection equivalent ideal voltage source voltage variety in end, Δ Isex,ΔIseyRespectively UPFC series connection end
The real and imaginary parts of current change quantity, RL,XLRespectively UPFC line resistance and reactance, Vix,ViyRespectively UPFC route head end
The real and imaginary parts of voltage, Vjx,VjyThe respectively real and imaginary parts of UPFC line end voltage, Δ PcFor UPFC active power control
Value variable quantity processed.
9. a kind of power system security based on UPFC according to claim 2 stablizes online preventive control method, special
Sign is, in the transient voltage safe and stable prevention and control:
It is described to the safety and stability problem as caused by forecast failure found in security evaluation, utilize the series connection end UPFC and parallel connected end
Reactive Power Control carries out prevention and control, specifically:
When the transient voltage safe and stable nargin obtained based on transient voltage safe and stable assessment is less than threshold value, UPFC is calculated
The reactive voltage of series connection end and parallel connected end Reactive Power Control value to the weak node for being unsatisfactory for transient voltage safe and stable requirement
Sensitivity, the series connection end UPFC that sensitivity is greater than threshold value or parallel connected end Reactive Power Control value as effective control measure,
The UPFC for being less than threshold value for sensitivity is no longer participate in subsequent control；
The series connection end the UPFC and parallel connected end Reactive Power Control value are wanted between current value and maximum value according to control precision
It asks and is divided into multiple gears, if series connection end and parallel connected end Reactive Power Control value are effective control measure, according to the two
The sum of Reactive Power Control value divides gear, and by Reactive Power Control value according to the series connection end UPFC and parallel connected end reactive power control
The reactive voltage level of sensitivity of value processed is allocated；If UPFC connects, the lifting capacity of end or parallel connected end Reactive Power Control value is big
In Reactive Power Control maximum changing value, then the Reactive Power Control maximum changing value of permission is set to；
For multiple gears of UPFC Reactive Power Control value, it is corresponding that UPFC Reactive Power Control value is set to each gear respectively
Reactive Power Control value carries out transient voltage safe and stable assessment later and checks, and selection security margin is met the requirements and nothing
The variation of function power control value is minimum or the maximum UPFC Reactive Power Control value gear of security margin improvement is corresponding idle
Control measure of the power control value as the failure.
10. a kind of power system security based on UPFC according to claim 9 stablizes online preventive control method, special
Sign is that the UPFC series connection end Reactive Power Control value that calculates is to the weak node for being unsatisfactory for transient voltage safe and stable requirement
Reactive voltage sensitivity, specifically:
The variable quantity of UPFC series connection end Reactive Power Control value is equivalent to UPFC route both ends reactive power injection rate, passes through meter
Sensitivity of the UPFC route both ends reactive power injection rate to voltage weak node voltage is calculated, it is idle to obtain UPFC route series connection end
Sensitivity of the power control value to voltage weak node voltage.
11. a kind of power system security based on UPFC according to claim 10 stablizes online preventive control method,
It is characterized in that, the variable quantity by UPFC series connection end Reactive Power Control value is equivalent to the injection of UPFC route both ends reactive power
Amount obtains UPFC route by calculating sensitivity of the UPFC route both ends reactive power injection rate to voltage weak node voltage
Sensitivity of the end Reactive Power Control value of connecting to voltage weak node voltage, specifically:
The UPFC series connection equivalent ideal in end caused by UPFC series connection end Reactive Power Control value variable quantity is calculated by following formula (3)
Voltage source voltage variety:
Wherein:
In formula, Δ QcFor UPFC series connection end Reactive Power Control value variable quantity；
The UPFC series connection equivalent idle injecting power in end is calculated by following formula (4):
In formula, Δ Siq,ΔSjqThe respectively equivalent idle injecting power of UPFC route head end and end；
Simultaneous solution formula (3) and (4) are calculating UPFC route both ends reactive power injection rate to voltage weak node pressure sensitive
On the basis of degree, sensitivity of the UPFC route series connection end Reactive Power Control value to voltage weak node voltage can be obtained；
The Reactive Power Control maximum changing value is obtained by following steps:
By the given UPFC series connection equivalent ideal voltage source maximum voltage V in endsemaxIt subtracts current voltage and obtains Δ Vsemax, substitute into public
Formula (3) left side, and then Δ Q is obtained by solution formula (3)cAs UPFC series connection end Reactive Power Control maximum changing value, UPFC
Parallel connected end Reactive Power Control maximum changing value is that the parallel connected end Reactive Power Control maximum value allowed subtracts current value.
12. a kind of power system security based on UPFC according to claim 9 stablizes online preventive control method, special
Sign is: the method also includes: control measure of comprehensive multiple forecast failures as final Control Measure, specifically:
For multiple voltage weak nodes after multiple forecast failures, each forecast failure can get its corresponding UPFC without
The lifting capacity of function power control value；
For a certain UPFC, the series connection end for being solved different forecast failures and parallel connected end Reactive Power Control value lifting capacity are most
Final Control Measure of the big value as UPFC series connection end and parallel connected end Reactive Power Control value.
13. a kind of power system security based on UPFC according to claim 2 stablizes online preventive control method, special
Sign is, in the Static Voltage Security prevention and control:
It is described to the safety and stability problem as caused by forecast failure found in security evaluation, utilize the series connection end UPFC and parallel connected end
Reactive Power Control carries out prevention and control, specifically:
When based on Static Voltage Security assessment obtain Static Voltage Security nargin be less than threshold value when, calculate UPFC series connection end and
Reactive voltage sensitivity of the parallel connected end Reactive Power Control value to the weak node for being unsatisfactory for Static Voltage Security requirement, will be sensitive
Degree, as effective control measure, is less than sensitivity greater than the series connection end UPFC of threshold value or parallel connected end Reactive Power Control value
The UPFC of threshold value is no longer participate in subsequent control；
By the series connection end UPFC to be asked and parallel connected end Reactive Power Control value according to control precision between current value and maximum value
It is required that multiple gears are divided into, if series connection end and parallel connected end Reactive Power Control value are effective control measure, according to two
The sum of person's Reactive Power Control value divides gear, and by Reactive Power Control value according to the series connection end UPFC and parallel connected end reactive power
The reactive voltage level of sensitivity of controlling value is allocated；The lifting capacity of end or parallel connected end Reactive Power Control value if UPFC connects
Greater than the Reactive Power Control maximum changing value, then the Reactive Power Control maximum changing value of permission is set to；
For multiple gears of UPFC Reactive Power Control value, it is corresponding that UPFC Reactive Power Control value is set to each gear respectively
Reactive Power Control value carries out Static Voltage Security assessment later and checks, and selection safety margin is met the requirements and reactive power control
Value variation processed is minimum or safety margin improves the corresponding Reactive Power Control value of maximum UPFC Reactive Power Control value gear and makees
For the control measure of the failure.
14. a kind of power system security based on UPFC according to claim 13 stablizes online preventive control method,
It is characterized in that, the method also includes: the control measure of comprehensive multiple forecast failures are as final Control Measure, specifically
Are as follows:
For multiple voltage weak nodes after multiple forecast failures, each forecast failure can get its corresponding UPFC without
The lifting capacity of function power control value；
For a certain UPFC, the series connection end for being solved different forecast failures and parallel connected end Reactive Power Control value lifting capacity are most
Final Control Measure of the big value as UPFC series connection end and parallel connected end Reactive Power Control value.
15. a kind of power system security based on UPFC stablizes online preventive control device characterized by comprising
Evaluation module, for carrying out security evaluation to forecast failure set based on power grid current operating conditions；
Prevention and control module, for utilizing UPFC to the safety and stability problem as caused by forecast failure found in security evaluation
Series connection end active power controller or the series connection end UPFC and parallel connected end Reactive Power Control carry out prevention and control, complete based on UPFC's
Power system security stablizes online preventive control.
16. a kind of power system security based on UPFC according to claim 15 stablizes online preventive control device,
Be characterized in that: the prevention and control module is overload prevention and control module, transient voltage safe and stable prevention and control module
Or any one of Static Voltage Security prevention and control module；
Or the carry out overload prevention and control module including being sequentially connected, transient voltage safe and stable prevention and control module and
Static Voltage Security prevention and control module, wherein latter control module is carried out on the basis of previous control module, will be controlled before
Initial conditions of the measure processed as subsequent control need to re-start safety and stability evaluation calculating, final control measure are taken to make
For the output of comprehensive prevention control measure.
17. a kind of power system security based on UPFC stablizes online preventive control system characterized by comprising
Processor is adapted for carrying out each instruction；And
Equipment is stored, is suitable for storing a plurality of instruction, described instruction is suitable for by processor load and perform claim requires to appoint in 1~14
Step described in one.
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