CN102130454B - Dynamic stability control method and system for computer aided design based power system - Google Patents
Dynamic stability control method and system for computer aided design based power system Download PDFInfo
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Abstract
The invention provides a dynamic stability control method and system for a computer aided design based power system. The method comprises the following steps of: calculating a characteristic root of each oscillation mode by analyzing power flow data of an interconnected electric power system; selecting the oscillation mode to be analyzed and adjusted and the most influenced high voltage direct current power transmission system and power generating set according to the characteristic root; calculating the sensitivity of parameters of related high voltage direct current power transmission additional control systems and power system stabilizer (PSS) additional control systems in the oscillation mode; and performing purposeful and clear optimal design on the parameters of the high voltage direct current power transmission additional control systems and the power system stabilizer additional control systems according to the sensitivity to improve the damp in the oscillation mode and suppress low-frequency oscillation. The blindness for scraping the parameters of the high voltage direct current power transmission additional control systems and the PSSs together by using an approximate method is avoided, and stable running of the large scale system is facilitated.
Description
Technical field
The present invention relates to the technical field that power system safety and stability is controlled, relate in particular to a kind of power system dynamic stability control method based on computer-aided design, and a kind of power system dynamic stability control system based on computer-aided design.
Background technology
Interconnected large power system (Large Scale System) is the trend of the times that solves international, the domestic power system technology development of main policy ，Ye Shi of the energy and load skewness, and its safe and stable operation is very great on national economy impact.The load capacity of interconnected large power system has tens million of even more than one hundred million kilowatts conventionally, in service area, population can reach tens million of even more than one hundred million conventionally, in electrical network, hundreds of transformer station is coupled together by thousands of transmission line of alternation currents and few heaped capacity, distant-range high voltage direct current transmission system, hundreds and thousands of generators and excitation system thereof are wherein also installed, with hiving off and associated architectural feature.Yet, in Large-Scale Interconnected electric power system, the inertia of each control system link causes signal transmission and control lag, cause interconnected electric power system must have potential spontaneous oscillation, and the vibration shape is various, only electromechanic oscillation mode usually discusses thousand, and low-frequency oscillation frequency is generally within the scope of 0.2-2.0Hz.While there is low-frequency oscillation in described interconnected electric power system, the safe and stable operation of entail dangers to system, the ability of restriction interconnection transmission power.Whether whether as for low-frequency oscillation, cause, after initiation, decay, depend on the damping of described each oscillation mode of electric power interconnected systems, therefore, managing to increase damping is the most frequently used and effective method that suppresses low-frequency oscillation, improves the dynamic stability of electrical network.Power system stabilizer, PSS in generator excited system (Power System Stabilizer, PSS) be exactly for strengthening low-frequency oscillation damping, to design specially, especially effective to vibrating between a group of planes in inhibition generator local oscillation and subregion, therefore, in recent years, obtained using the most widely.
In addition, in the HVDC (High Voltage Direct Current) transmission system of trans-regional, large volume transport active power, adding additional control is also the effective means that suppress low-frequency oscillation between great Qu.
PSS is a kind of additional control function of generator excited system, excitation normal operation be take set end voltage as feedback quantity, PSS has added on this basis take active power as main feedback, when meritorious generation vibration, is namely that system increases a damping, makes vibration steady as early as possible.And Yi Ge power plant input PSS effect is limited separately, only have the most of power supply point in interconnected electric power system all to drop into PSS, the resistant and oscillation resistant ability of electrical network just can significantly improve.Therefore, each large electrical network of the whole nation in recent years, is all used as the penetration and promotion of PSS as a vital task and is grabbed.
Interconnected electric power system is huge and complicated, the low frequency oscillation mode of the various different frequencies that lie dormant, and each oscillation mode and different unit or group of planes are associated, once low-frequency oscillation will occur the underdamping of a certain oscillation mode.And in conventional PSS, conventionally adopt local effectively, without the control strategy of coordinating.In interconnected electric power system, every generator has PSS, very complicated on the impact of each electromechanic oscillation mode, single PSS is having the inhibiting while to have harmful effect to another one oscillation mode to some oscillation modes, therefore, if the PSS parameter of each power system stabilizer, PSS in whole described interconnected electric power system can not be coordinated according to concrete oscillation mode exactly, be unfavorable for the Existence of Global Stable operation of described interconnected electric power system.
And, for the AC-DC interconnecting power networks that exist in a large number at present, owing to lacking technological means and method, the additional control system of the high voltage direct current transmission of trans-regional, large volume transport active power is not always all considered in traditional power system dynamic stability analysis, therefore, for a long time, the additional control system that people cannot predict and bring into play always high voltage direct current transmission is in the effect and the speciality that suppress low-frequency oscillation between great Qu.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of can adjust according to concrete oscillation mode the parameter of each relevant high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, to reach the control method that improves power system dynamic stability.
A power system dynamic stability control method based on computer-aided design, comprises the following steps: the original flow data that reads described interconnected electric power system from the system data file dat of the flow calculation program of interconnected electric power system and transient stability analysis data file swi; From the calculation of tidal current file pfo of described flow calculation program, read the calculation of tidal current data of described each oscillation mode of interconnected electric power system; According to described original flow data and described calculation of tidal current data, calculate the characteristic root of described interconnected electric power system; According to the real part of characteristic root described in each, whether the damping ratio of the described oscillation mode that judgement is corresponding is less than predetermined value, if be less than described predetermined value, select corresponding described oscillation mode and corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system; According to the characteristic root variable quantity of selected described oscillation mode, and the parameters variable quantity of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, according to following formula, calculate high voltage direct current transmission additional control system corresponding to oscillation mode described in each and the parametric sensitivity of power system stabilizer, PSS additional control system:
Wherein, S
rRSCreal part for the relevant high voltage direct current transmission additional control system of described oscillation mode and the parametric sensitivity of power system stabilizer, PSS additional control system; λ is the characteristic root of described oscillation mode; α is the parameter of relevant high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system;
If the real part of described relevant high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system parametric sensitivity is greater than 0, reduce the value of the parameter of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system; Otherwise, increase the value of the parameter of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.
The technical problem to be solved in the present invention is also to provide a kind of can adjust according to concrete oscillation mode the parameter of each relevant high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, to reach the control that improves power system dynamic stability.
A power system dynamic stability control system based on computer-aided design, comprising: characteristic root computing module, Oscillation mode analysis module, parametric sensitivity computing module and parameter adjustment module.Described characteristic root computing module, for according to the flow data of interconnected electric power system, calculates the characteristic root of each oscillation mode in described interconnected electric power system;
Described characteristic root computing module comprises following submodule:
For the system data file dat of the flow calculation program from described interconnected electric power system and the module that transient stability analysis data file swi reads the original flow data of described interconnected electric power system;
For read the module of the calculation of tidal current data of described each oscillation mode of interconnected electric power system from the calculation of tidal current file pfo of described flow calculation program;
And, for calculate the module of the characteristic root of described interconnected electric power system according to described original flow data and described calculation of tidal current data;
Described Oscillation mode analysis module is used for according to the real part of characteristic root described in each, whether the damping ratio of the described oscillation mode that judgement is corresponding is less than predetermined value, if be less than described predetermined value, select corresponding described oscillation mode and corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system; Described parametric sensitivity computing module is for the characteristic root variable quantity of the selected described oscillation mode of basis, and the parameters variable quantity of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, according to following formula, calculate high voltage direct current transmission additional control system corresponding to oscillation mode described in each and the parametric sensitivity of power system stabilizer, PSS additional control system:
Wherein, S
rRSCreal part for the relevant high voltage direct current transmission additional control system of described oscillation mode and the parametric sensitivity of power system stabilizer, PSS additional control system; λ is the characteristic root of described oscillation mode; α is the parameter of relevant high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system;
Described parameter adjustment module is greater than at 0 o'clock for the real part at described parametric sensitivity, reduces the value of the parameter of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system; Otherwise, increase the value of the parameter of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.
Compared with prior art, in power system dynamic stability control method and system thereof based on computer-aided design of the present invention, by the flow data of described interconnected electric power system, calculate the characteristic root of each oscillation mode, according to described characteristic root, choose the oscillation mode that need to carry out analysis and regulation, and the most effective power system stabilizer, PSS (PSS).Then calculate the PSS parametric sensitivity of described power system stabilizer, PSS under described oscillation mode, the PSS parameter of described power system stabilizer, PSS is optimized, improve the damping of oscillation mode, prevent that low-frequency oscillation from occurring.Therefore the stable control method of interconnected electric power system of the present invention and system thereof can be according to the concrete oscillation mode adjustment of the described interconnected electric power system PSS parameters of effective power system stabilizer, PSS, make the adjustment of power system stabilizer, PSS described in each more suit the real-time condition of described interconnected electric power system, be conducive to the stable operation of described interconnected electric power system.
In a word, the present invention systematically, measure of overall importance has intactly been proposed from the angle of the whole network, analyze the dynamic stability of AC-DC interconnecting power network, screening oscillation mode, design, PSS and high voltage direct current transmission additional control system between optimization and coordination each unit, by high voltage direct current transmission and control system thereof being carried out to modeling in SSAP software, linearisation, include oscillation mode calculating and sensitivity analysis and the control system optimal design etc. of the whole network in, thereby control and improve the dynamic stability of AC-DC interconnecting power network, solved the long-term insurmountable problem of this technical field.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of the stable control method of interconnected electric power system of the present invention;
Fig. 2 is a kind of model structure schematic diagram of typical power system stabilizer, PSS additional control system;
The structural representation of the warbled high voltage direct current transmission additional control system of a kind of typical bilateral of Fig. 3;
Fig. 4 is the structural representation of the stabilizing control system of interconnected electric power system of the present invention.
Embodiment
Refer to Fig. 1, Fig. 1 is the flow chart of steps of the stable control method of interconnected electric power system of the present invention.
The stable control method of described interconnected electric power system comprises the following steps:
Step S101, according to the flow data of interconnected electric power system, calculates the characteristic root of each oscillation mode in described interconnected electric power system;
When the characteristic root that carries out described oscillation mode calculates, can from the system data file dat of the flow calculation program (BPA) of described interconnected electric power system and transient stability analysis data file swi, read the original flow data of described interconnected electric power system, wherein, described original flow data reacts described interconnected electric power system structure and operating condition; And from the calculation of tidal current file pfo of described flow calculation program (BPA), read the calculation of tidal current data of described each oscillation mode of interconnected electric power system, i.e. the initial balance working point of described interconnected electric power system; Then according to described original flow data and described calculation of tidal current data, calculate the characteristic root of described electric power system.
Before starting calculating, can, first according to the scale of described interconnected electric power system, select suitable computational methods to calculate described characteristic root: for larger interconnected electric power system, to adopt IRA key feature root algorithm; For the less interconnected electric power system of scale, adopt the full characteristic root algorithm of QR.
By analyzing the scale of described interconnected electric power system, select respectively suitable characteristic root algorithm, can improve the efficiency of calculating described characteristic root, thereby improve the control efficiency of the stable control method of whole described interconnected electric power system.
Step S102, according to the real part of characteristic root described in each, whether the damping ratio of the described oscillation mode that judgement is corresponding is less than predetermined value, if be less than described predetermined value, select corresponding described oscillation mode and corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system;
The characteristic root of each oscillation mode of the described interconnected electric power system calculating in step S101 is: λ=σ+j ω, wherein, the respectively corresponding oscillation mode of characteristic root described in each, σ is the real part of described characteristic root, i.e. the damping ratio of corresponding oscillation mode; ω is the imaginary part of described characteristic root, is directly proportional with the frequency of corresponding oscillation mode.
Therefore, in this step, the real part of described characteristic root can be compared with predetermined value, select the oscillation mode of underdamping, described predetermined value can need to set according to the actual motion of industry standard or electrical network, conventionally requires damping ratio should be not less than 0.1.
If judge that in this step the damping ratio of described oscillation mode is greater than described predetermined value, do not adjust corresponding described high voltage direct current transmission additional control system and the parameter of power system stabilizer, PSS additional control system, from step S101, start from the parameter of high voltage direct current transmission additional control system corresponding to other oscillation modes of new execution analysis and power system stabilizer, PSS additional control system.
In this step; can further according to the electric network composition of described interconnected electric power system, go the selected oscillation mode of analyzing; for example; can be according to the generation area of oscillation mode corresponding to described characteristic root the effect in described interconnected electric power system or protection priority, determine its whether oscillation mode of selective analysis.In the present embodiment, the oscillation mode of can preferentially select in a group of planes, unit is relevant with power plant part, preferentially strengthens the damping of these oscillation modes.
In this step, corresponding described oscillation mode and corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system of while.
Step S103, according to the characteristic root variable quantity of selected described oscillation mode, and the parameters variable quantity of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, calculate high voltage direct current transmission additional control system corresponding to oscillation mode described in each and the parametric sensitivity of power system stabilizer, PSS additional control system;
The model of typical case's power system stabilizer, PSS as shown in Figure 2, the transfer function of described power system stabilizer, PSS comprises: the inertial element being comprised of R, forming every straight link and the multistage lead-lag link that is comprised of phase compensation link time constant T1～T6 of being comprised of time constant Tw, conventionally add the multiplication factor Kp and each time constant Ti(i=1 that control, 2,3 ... 6) can be by there being object, have direction and regulate to be optimized.
And the structure of the typical warbled high voltage direct current transmission additional control system of bilateral as shown in Figure 3, wherein: Δ ω
r, Δ ω
ibe respectively the micro-increment of rotating speed of rectification side, inversion side; K
r, K
ibe respectively the modulation gain of rectification side, inversion side; T
r, T
ibe respectively the Measuring Time constant of rectification side, inversion side; T
rW, T
iWbe respectively rectification side, inversion side every straight link time constant; T
r1～T
r6for rectification side lead-lag phase compensation link time constant; T
i1～T
i6for inversion side lead-lag phase compensation link time constant; P
modfor the warbled output of bilateral, as the power modulation amount input signal of direct current main control loop.
Therefore, described high voltage direct current transmission additional control system has the additional multiplication factor Kp controlling and each time constant Ti equally, can be by there being object, have direction and regulate to be optimized.
In this step, according to following formula, calculate the high voltage direct current transmission additional control system of oscillation mode and the parametric sensitivity of power system stabilizer, PSS additional control system described in each:
Wherein, S
rRSCreal part for the relevant high voltage direct current transmission additional control system of described oscillation mode and the parametric sensitivity of power system stabilizer, PSS additional control system; λ is the characteristic root of described oscillation mode; α is the parameter of relevant high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.As a kind of preferred implementation, described parameter is phase compensation link time constant Ti and/or the multiplication factor Kp of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.
Step S104, the size indication according to parametric sensitivity described in each, has object, has direction and regulate the corresponding parameter of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.
In the present embodiment, particularly, if calculate the corresponding parametric sensitivity of multiplication factor Kp in described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system in above-mentioned steps S103, in this step, the multiplication factor Kp of the links of high voltage direct current transmission additional control system described in each and described power system stabilizer, PSS additional control system is optimized and is adjusted: if the real part of the parametric sensitivity of the multiplication factor Kp of described additional control is greater than 0, reduce the value of described multiplication factor Kp; If the real part of the parametric sensitivity of the multiplication factor Kp of described additional control is less than 0, increase the value of described multiplication factor Kp.
If according to the corresponding parametric sensitivity of time constant Ti that calculates the phase compensation link in described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system in above-mentioned steps S103, in this step, the time constant Ti of the links in each high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system is optimized and is adjusted: if the real part of the parametric sensitivity of described phase compensation link time constant Ti is greater than 0, reduce the value of described time constant Ti; If the real part of the parametric sensitivity of described phase compensation link time constant Ti is less than 0, increase the value of described time constant Ti.
Repeating step S101-S104, calculate respectively the characteristic root of described interconnected electric power system oscillation mode described in each, analyzing the parameter that the parametric sensitivity of oscillation mode described in each carries out described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system regulates, make the work of working in coordination of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, can effectively suppress low-frequency oscillation, can not produce obvious side effect again, for example, significantly weaken the damping of other oscillation mode.
If judge that in step S102 the damping ratio of all oscillation modes of described interconnected electric power system is all greater than described predetermined value, think that the damping ratio of all oscillation modes all meets the requirements, finish the adjustment to the parameter of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.
Compared with prior art, in power system dynamic stability control method based on computer-aided design of the present invention, use the system data of flow calculation program (BPA) and the trend of current electric power system extensive use to calculate output, the sensitivity index of the damping ratio (characteristic value real part) of calculating respectively each oscillation mode to the multiplication factor of described power system stabilizer, PSS and high voltage direct current transmission additional control system and phase compensation link time constant.By contrast, be easy to analyze the impact of parameter on the damping of oscillation mode described in each draw each high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.The parameter that can determine which high voltage direct current transmission additional control system of adjustment and power system stabilizer, PSS additional control system is the most effective to suppressing which oscillation mode.How clear and definite parameter changes most suitable: at described parametric sensitivity, be greater than at 0 o'clock, reduce parameter and can reduce characteristic root real part; At described parametric sensitivity, be less than at 0 o'clock, strengthen parameter and can increase characteristic root real part, increase the damping of this pattern, be conducive to stabilize vibration.Do not need to carry out the high voltage direct current transmission additional control system of unit and the on-the-spot regulation experiment of power system stabilizer, PSS additional control system, whether suitablely just can predict and be evaluated at this point described high voltage direct current transmission additional control system of installation and power system stabilizer, PSS additional control system, and adjust the effect that parameter can reach.The new method that this provides research, design and improved electrical network dynamic stability for operation, scheduling, management, scientific research and design department, for from overall angle, optimize described power system stabilizer, PSS the scheme of layouting, its parameter of design optimization, avoid described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system put into operation and parameter tuning blindness new means are provided, also can optimize regulation experiment by guide field.
Simultaneously, when large-scale AC-DC interconnecting power network is carried out to dynamic stability analysis, use the analytical method of the parametric sensitivity of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, can be in a large amount of high voltage direct current transmission additional control systems and power system stabilizer, PSS additional control system, the current effect of adjusting of distinguishing each high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system is increase or reduce with the direction that further parameter optimization is adjusted; Avoid PSS and high voltage direct current transmission additional control system parameter in Large-Scale Interconnected electric power system to try to gather by approximation method, cannot optimize these excellent those bad situations of effect.
Refer to Fig. 3, Fig. 3 is the structural representation of the stabilizing control system of interconnected electric power system of the present invention.
In described interconnected electric power system, power system stabilizer, PSS comprises: characteristic root computing module 31, Oscillation mode analysis module 32, parametric sensitivity computing module 33 and parameter adjustment module 34.
Described characteristic root computing module 31, for according to the flow data of interconnected electric power system, calculates the characteristic root of each oscillation mode in described interconnected electric power system; Described Oscillation mode analysis module 32 is for according to the real part of characteristic root described in each, whether the damping ratio of the described oscillation mode that judgement is corresponding is less than predetermined value, if be less than described predetermined value, select corresponding described oscillation mode and corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system; Described parametric sensitivity computing module 33 is for the characteristic root variable quantity of the selected described oscillation mode of basis, and the parameters variable quantity of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, calculate high voltage direct current transmission additional control system corresponding to oscillation mode described in each and the parametric sensitivity of power system stabilizer, PSS additional control system; Described parameter adjustment module 34 is for according to the size indication of parametric sensitivity described in each, has object, has direction and regulate the corresponding parameter of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.
In the present embodiment, described characteristic root computing module 31 comprises following submodule:
For the system data file dat of the flow calculation program from described interconnected electric power system and the module that transient stability analysis data file swi reads the original flow data of described interconnected electric power system, wherein, described original flow data reacts described interconnected electric power system structure and operating condition;
For read the module of the calculation of tidal current data of described each oscillation mode of interconnected electric power system from the calculation of tidal current file pfo of described flow calculation program;
And, for calculate the module of the characteristic root of described electric power system according to described original flow data and described calculation of tidal current data.
Further, described characteristic root computing module 31 also comprises: for according to the scale of described interconnected electric power system, select respectively key feature root algorithm or full characteristic root algorithm to calculate the module of characteristic root of the described oscillation mode of described interconnected electric power system, for larger interconnected electric power system, adopt IRA key feature root algorithm; For the less interconnected electric power system of scale, adopt the full characteristic root algorithm of QR.
By analyzing the scale of described interconnected electric power system, select respectively suitable characteristic root algorithm, can improve the computational efficiency of described characteristic root computing module, thereby improve the control efficiency of the stabilizing control system of whole described interconnected electric power system.
Described Oscillation mode analysis module 32 obtains the characteristic root of described each oscillation mode of interconnected electric power system from described characteristic root computing module 31.Described characteristic root is: λ=σ+j ω, wherein, and the respectively corresponding oscillation mode of characteristic root described in each, σ is the real part of described characteristic root, i.e. the damping ratio of corresponding oscillation mode; ω is the imaginary part of described characteristic root, is directly proportional with the frequency of corresponding oscillation mode.
Described Oscillation mode analysis module 32 is compared the real part of described characteristic root with predetermined value, select the oscillation mode of underdamping, wherein, described predetermined value can need to set according to the actual motion of industry standard or electrical network, conventionally requires damping ratio should be not less than 0.1.
If the damping ratio of the described oscillation mode of described Oscillation mode analysis module 32 judgement is greater than described predetermined value, do not adjust corresponding described high voltage direct current transmission additional control system and the characteristic parameter of power system stabilizer, PSS additional control system.
Further; described Oscillation mode analysis module 32 can also be gone according to the electric network composition of described interconnected electric power system the oscillation mode of selected selective analysis; for example; can be according to the generation area of oscillation mode corresponding to described characteristic root the effect in described interconnected electric power system or protection priority, determine its whether oscillation mode of selective analysis.In the present embodiment, described Oscillation mode analysis module 32 can preferably arrange selects the oscillation mode that a group of planes is interior, unit is relevant with power plant part, preferentially strengthens the damping of these oscillation modes.
Described Oscillation mode analysis module 32 is selected high voltage direct current transmission additional control system and the power system stabilizer, PSS additional control system relevant to described oscillation mode simultaneously.
In the present embodiment, described parametric sensitivity computing module 33 calculates the high voltage direct current transmission additional control system of oscillation mode and the parametric sensitivity of power system stabilizer, PSS additional control system described in each according to following formula:
Wherein, S
rRSCreal part for the relevant high voltage direct current transmission additional control system of described oscillation mode and the parametric sensitivity of power system stabilizer, PSS additional control system; λ is the characteristic root of described oscillation mode; α is the parameter of relevant high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, and the parameter of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system can be phase compensation link time constant Ti and multiplication factor Kp.
In a preferred embodiment, described parametric sensitivity computing module 33 calculates simultaneously and exports the sensitivity of a low frequency oscillation mode to all selected high voltage direct current transmission additional control systems and power system stabilizer, PSS additional control system parameter; And the parametric sensitivity of described oscillation mode and a plurality of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system is formed to Output matrix, as the basis of the high voltage direct current transmission additional control system in described interconnected electric power system and power system stabilizer, PSS additional control system parameter optimization.
Described parameter adjustment module 34 is when regulating the parameter of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, if the real part of described parametric sensitivity is greater than 0, reduce corresponding described high voltage direct current transmission additional control system and the parameter value of power system stabilizer, PSS additional control system; If the real part of described parametric sensitivity is less than 0, increase corresponding described parameter value.
The described interconnected electric power system mesohigh direct current transportation additional control system the present invention is directed to and the control system of power system stabilizer, PSS additional control system are calculated respectively the characteristic root of described interconnected electric power system oscillation mode described in each, analyzing the parameter that the parametric sensitivity of oscillation mode described in each carries out described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system regulates, make the work that matches of each power system stabilizer, PSS of described interconnected electric power system and high voltage direct current transmission additional control system, suppress low-frequency oscillation.
If the damping ratio of all oscillation modes of the described interconnected electric power system of described Oscillation mode analysis module 32 judgement is all greater than described predetermined value, think that the damping ratio of all oscillation modes all meets the requirements, finish the adjustment to the parameter of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.
Compared with prior art, the stabilizing control system of interconnected electric power system of the present invention calculates output by reading the system data of flow calculation program (BPA) and the trend of current electric power system extensive use, the sensitivity index of the damping (characteristic value real part) of calculating respectively each oscillation mode to the multiplication factor of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system and phase compensation link time constant.By contrast, be easy to analyze the impact of parameter on the damping of oscillation mode described in each draw each PSS additional control system and high voltage direct current transmission additional control system.The parameter that can determine which PSS additional control system of adjustment and high voltage direct current transmission additional control system is the most effective to suppressing which oscillation mode.How clear and definite parameter changes most suitable: at described parametric sensitivity, be greater than at 0 o'clock, reduce parameter and can reduce characteristic root real part; At described parametric sensitivity, be less than at 0 o'clock, strengthen parameter and can increase characteristic root real part, increase the damping of this pattern, be conducive to stabilize vibration.Do not need to carry out the power system stabilizer, PSS of unit and the on-the-spot regulation experiment of high voltage direct current transmission additional control system, whether suitablely just can predict and be evaluated at this some installation power system stabilizer, PSS and high voltage direct current transmission additional control system, and the effect of adjusting parameter.The new method that this provides research, design and improved electrical network dynamic stability for operation, scheduling, management, scientific research and design department, for from overall angle, optimize described power system stabilizer, PSS and high voltage direct current transmission additional control system the scheme of layouting, its parameter of design optimization, avoid described power system stabilizer, PSS and high voltage direct current transmission additional control system put into operation and parameter tuning blindness new means are provided, also can optimize regulation experiment by guide field.
Simultaneously, when large-scale AC-DC interconnecting power network is carried out to dynamic stability analysis, use the analytical method of the parametric sensitivity of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, can be in a large amount of power system stabilizer, PSSs and high voltage direct current transmission additional control system, the current effect of adjusting of distinguishing each PSS and high voltage direct current transmission additional control system is increase or reduce with the direction that further parameter optimization is adjusted; Avoid PSS and high voltage direct current transmission additional control system parameter in interconnected electric power system to try to gather by approximation method, cannot optimize these excellent those bad situations of effect.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (4)
1. the power system dynamic stability control method based on computer-aided design, is characterized in that, comprises the following steps:
From the system data file dat of the flow calculation program of interconnected electric power system and transient stability analysis data file swi, read the original flow data of described interconnected electric power system;
From the calculation of tidal current file pfo of described flow calculation program, read the calculation of tidal current data of described each oscillation mode of interconnected electric power system;
According to described original flow data and described calculation of tidal current data, calculate the characteristic root of described interconnected electric power system;
According to the real part of characteristic root described in each, whether the damping ratio of the described oscillation mode that judgement is corresponding is less than predetermined value, if be less than described predetermined value, select corresponding described oscillation mode and corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system;
According to the characteristic root variable quantity of selected described oscillation mode, and the parameters variable quantity of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, according to following formula, calculate high voltage direct current transmission additional control system corresponding to oscillation mode described in each and the parametric sensitivity of power system stabilizer, PSS additional control system:
Wherein, S
rRSCreal part for the relevant high voltage direct current transmission additional control system of described oscillation mode and the parametric sensitivity of power system stabilizer, PSS additional control system; λ is the characteristic root of described oscillation mode; α is the parameter of relevant high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system;
If the real part of described relevant high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system parametric sensitivity is greater than 0, reduce the value of the parameter of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system; Otherwise, increase the value of the parameter of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.
2. the power system dynamic stability control method based on computer-aided design as claimed in claim 1, is characterized in that: the described parameter of adjusting comprises time constant T and the multiplication factor K of the phase compensation link of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.
3. the power system dynamic stability control system based on computer-aided design, is characterized in that comprising following functional module:
Characteristic root computing module, for according to the flow data of interconnected electric power system, calculates the characteristic root of each oscillation mode in described interconnected electric power system;
Described characteristic root computing module comprises following submodule:
For the system data file dat of the flow calculation program from described interconnected electric power system and the module that transient stability analysis data file swi reads the original flow data of described interconnected electric power system;
For read the module of the calculation of tidal current data of described each oscillation mode of interconnected electric power system from the calculation of tidal current file pfo of described flow calculation program;
And, for calculate the module of the characteristic root of described interconnected electric power system according to described original flow data and described calculation of tidal current data;
Oscillation mode analysis module, be used for according to the real part of characteristic root described in each, whether the damping ratio of the described oscillation mode that judgement is corresponding is less than predetermined value, if be less than described predetermined value, select corresponding described oscillation mode and corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system;
Parametric sensitivity computing module, characteristic root variable quantity for the selected described oscillation mode of basis, and the parameters variable quantity of described high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system, according to following formula, calculate high voltage direct current transmission additional control system corresponding to oscillation mode described in each and the parametric sensitivity of power system stabilizer, PSS additional control system:
Wherein, S
rRSCreal part for the relevant high voltage direct current transmission additional control system of described oscillation mode and the parametric sensitivity of power system stabilizer, PSS additional control system; λ is the characteristic root of described oscillation mode; α is the parameter of relevant high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system;
Parameter adjustment module, is greater than at 0 o'clock for the real part at described parametric sensitivity, reduces the value of the parameter of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system; Otherwise, increase the value of the parameter of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.
4. the power system dynamic stability control system based on computer-aided design as claimed in claim 3, is characterized in that: the parameter that described adjustment module regulates comprises time constant T and the multiplication factor K of the phase compensation link of corresponding high voltage direct current transmission additional control system and power system stabilizer, PSS additional control system.
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| CN102801178B (en) * | 2012-07-20 | 2014-12-10 | 南方电网科学研究院有限责任公司 | Additional control method for direct current transmission in frequency domain analysis |
| CN103997048B (en) * | 2014-05-28 | 2016-06-08 | 广东电网公司电力科学研究院 | Power grid regulation method and system for power oscillation damping |
| CN104253441B (en) * | 2014-10-13 | 2015-07-22 | 国家电网公司 | Direct-current power modulation inhibition method for low-frequency oscillation of inter-regional power grid call wire |
| CN107769229B (en) * | 2017-12-07 | 2019-09-06 | 国网河北省电力有限公司电力科学研究院 | A kind of multimachine PSS parameter optimization setting method adapting to power grid multi-operating condition |
| CN107947201B (en) * | 2017-12-12 | 2020-08-11 | 国网四川省电力公司电力科学研究院 | Method for judging stability of small disturbance of electric power system caused by wind power fluctuation |
| CN108334721A (en) * | 2018-04-24 | 2018-07-27 | 清华大学 | Two benches electric system key feature selection method based on mMIFS-U and device |
| CN109995023B (en) * | 2019-03-01 | 2020-09-01 | 上海电力学院 | Method and system for judging stability of power system based on spectral clustering region division |
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