CN102347613B - Method for automatically selecting on-line strategy and off-line strategy of transient security and stability emergency control of electrical power system - Google Patents

Method for automatically selecting on-line strategy and off-line strategy of transient security and stability emergency control of electrical power system Download PDF

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CN102347613B
CN102347613B CN201110279947.7A CN201110279947A CN102347613B CN 102347613 B CN102347613 B CN 102347613B CN 201110279947 A CN201110279947 A CN 201110279947A CN 102347613 B CN102347613 B CN 102347613B
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CN102347613A (en
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徐泰山
方勇杰
薛禹胜
李碧君
鲍颜红
罗剑波
余文杰
汪马翔
王胜明
郑亮
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Nari Technology Co Ltd
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Abstract

The invention belongs to the technical field of electrical power system security and stability control and is suitable for a transient security and stability emergency control system to automatically select an on-line strategy or an off-line strategy. On the basis of a transient security and stability quantitative analysis method, the invention provides the index of influence of running state change on transient security and stability for judging the adaptability of the on-line control strategy to the running state change. The invention comprises the following two parts: (1) issuance of the on-line strategy and confirmation of the effectiveness thereof, i.e. checking the security of the on-line strategy to judge whether issuing the on-line strategy to a control device, and judging the effectiveness of the issued on-line strategy constantly; and (2) selection of the on-line strategy and the off-line strategy during failure, i.e. selecting the on-line strategy when 'form characters' detected by the control device are as same as 'form characters' of the on-line strategy, the time for generating the on-line strategy is not long, and the influence degree of the running state change calculated on the basis of measured data of the control device on the transient security and stability meets the requirement; and otherwise, selecting the off-line strategy.

Description

Electric power system is steady emergency control strategy of on-line and off-line strategy automatic selecting method temporarily
Technical field
The invention belongs to power system safety and stability control technology field, be applicable to transient safe and stable emergency control system and how automatically select strategy of on-line or off-line strategy.
Background technology
Along with the expansion of electric power system scale and the changeable of operational mode, transient safe and stable (being called for short: the steady temporarily) emergency control policy formulated by off-line analysis is difficult to realize optimal control, even be difficult to the security and stability guaranteeing electric power system, need the actual motion state according to electric power system, take the strategy of on-line calculating steady emergency control temporarily in the mode of line computation.But, determine that steady On-line Control strategy needs certain computing time temporarily, supposes that average period is (being generally several minutes), namely requires that On-line Control strategy exists to 2 the change of operation states of electric power system can be adapted in time, really could realize controlling according to On-line Control strategy, guarantee the transient safe and stable of electric power system.In fact, the running status of electric power system is constantly change, and within several minutes, the steady temporarily characteristic variations of electric power system may be larger, and the On-line Control strategy formulated based on the operation states of electric power system before several minutes may not meet steady requirement temporarily.For this reason, the definition of " mode word " (such as equipment is thrown/moved back) in patent " power system safety stabilization emergency control policy automatically matching method " (patent No.: ZL 200710135095.8) safety and stability control device of giving chapter and verse (be called for short: security control device), determine " the mode word " of power system operation section (be called for short: the section) data corresponding with being created on line traffic control strategy, when forecast failure occurs, by " mode word " that " the mode word " and security control device nearest moment before fault that mate On-line Control strategy are surveyed, that avoids On-line Control strategy is not suitable with problem.In fact, in the electric power system of safety and stability characteristic complexity, be difficult to propose suitable " mode word " in safety stabilization control system (being called for short: Safety system), guarantee the reliability of On-line Control strategy and Off-line control policy selection.
The present invention's three links such as the check of On-line Control strategy validity and control strategy selection from On-line Control policy distribution, security control device improve the reliability of On-line Control strategy and Off-line control policy selection.Carry out the adaptability judgement of this control strategy add On-line Control strategy generating in On-line Control policy distribution link after immediately based on current section data, for On-line Control strategy steady temporarily can not be ensured, be not issued in security control device; For the On-line Control strategy being issued to security control device, add the flow process of constantly carrying out the check of On-line Control strategy validity based on new profile data; In On-line Control strategy and Off-line control policy selection link, based on steady quantification theory proposition POWER SYSTEM STATE change temporarily to the computational methods of temporary steady nargin influence degree, under the condition that the estimated value demand fulfillment adding steady nargin temporarily after considering Safety system real measured data requires, just may select On-line Control strategy.
Summary of the invention
The present invention seeks to: accurately judge the adaptability that temporary steady emergency control On-line Control strategy changes operation states of electric power system to improve the reliability of On-line Control strategy and Off-line control policy selection.
The present invention adopts following technical scheme to realize, and comprises the steps:
1) On-line Control policy calculation flow process: carry out section data integration in control centre's integrated application EMS state estimation real time data, WAMS real time data and Safety system real time data, and the steady temporarily emergency control strategy of on-line calculating the forecast failure that Safety system covers based on this profile data.
2) On-line Control strategy is checked and is issued flow process: in control centre's integrated application EMS state estimation real time data, WAMS real time data and Safety system real time data re-start section data integration, and based on this profile data, carry out considering On-line Control strategy implement after the steady temporarily quantitative evaluation of this forecast failure, if surely can ensure temporarily, then by forecast failure information, On-line Control strategy and relevant information (steady quantitative information temporarily thereof, the section moment, the generator of Safety system monitoring in " mode word " and profile data and information on load) flush in corresponding safety and stability control device (being called for short: security control device), " significance bit " of this On-line Control strategy is set to " effectively " simultaneously, otherwise, abandon this On-line Control strategy, do not carry out the refreshing of On-line Control strategy.
3) in security control device, On-line Control strategy validity checks flow process: in control centre's integrated application EMS state estimation real time data, WAMS real time data and Safety system real time data re-start section data integration, and based on this profile data, carry out the steady temporarily quantitative evaluation after considering the On-line Control strategy enforcement in security control device, if surely can ensure temporarily, then by information (the temporarily steady quantitative information relevant to this forecast failure, the section moment, the generator of Safety system monitoring in " mode word " and profile data and information on load) flush in corresponding security control device, " significance bit " of this On-line Control strategy is set to " effectively " simultaneously, otherwise, " significance bit " of this On-line Control strategy is set to engineering noise.
4) there is the selection flow process of strategy of on-line and off-line strategy in rear security control device in forecast failure: when security control device detects that forecast failure occurs, if " significance bit " of this On-line Fault control strategy is " effectively " in security control device, the duration that the corresponding profile data moment, apart from fault, occurs the moment is less than set point, " mode word " that its " mode word " and the security control device nearest moment before fault surveys is identical, and based on the operation states of electric power system change that Safety system measured data calculates, influence degree steady is temporarily met the demands, then select corresponding On-line Control strategy, otherwise, adopt corresponding Off-line control strategy.
effect and advantage:
One aspect of the present invention, by carrying out steady temporarily check based on new profile data to On-line Control strategy, effectively reduces security control device and selects the probability not meeting the steady On-line Control strategy required temporarily; Pass through in On-line Control strategy and Off-line control strategy link on the other hand, theoretical based on steady quantitative analysis temporarily, estimate the steady temporarily nargin after the generator output and load variations considering Safety system Real-Time Monitoring, the reliability that control strategy is selected can have been significantly improved.The present invention will promote the engineer applied of the temporary steady emergency control technology of scale grid line energetically.
Accompanying drawing explanation
Fig. 1-Fig. 4 is the flow chart of the inventive method.
Embodiment
Below in conjunction with accompanying drawing 1-Fig. 4, the inventive method is described in detail.
Fig. 1-Fig. 4 is 4 independently circular treatment flow processs, Fig. 1 is On-line Control policy calculation flow process, Fig. 2 is that On-line Control strategy is checked and issues flow process, Fig. 3 checks flow process for On-line Control strategy validity in security control device, and Fig. 4 is the selection flow process of On-line Control strategy and Off-line control strategy in security control device after forecast failure occurs.About the check flow process of Fig. 3, need explanation two point, as long as one is have On-line Control strategy in security control device, even without refreshing, this check flow process still needs circulation to perform; Two is in for security control device in On-line Control strategy validity check process, if detect, new On-line Control strategy has flushed in security control device, before then stopping ongoing refreshing immediately, On-line Control strategy validity is checked, and starts and checks for new On-line Control strategy validity.
Be below that example is described by a forecast failure, for multiple forecast failure, then take parallel processing manner.
What in Fig. 1, step 1 described is carry out section data integration in control centre's integrated application EMS state estimation real time data, WAMS real time data and Safety system real time data.
The profile data that what in Fig. 1, step 2 described is after integrating based on step 1, the forecast failure covered for Safety system calculates corresponding steady emergency control strategy of on-line temporarily.
What in Fig. 2, step 1 described is the On-line Control strategy generating that in cycle detection Fig. 1 On-line Control policy calculation flow process, whether forecast failure has a new round, if the On-line Control strategy of forecast failure generates, even if On-line Control strategy is identical with last round of, also enter step 2; Otherwise, continue to detect.
What in Fig. 2, step 2 described is obtain up-to-date EMS state estimation real time data, WAMS real time data and Safety system real time data, re-starts the section data integration merging Safety system real time data, obtains new profile data.
What in Fig. 2, step 3 described is based on new profile data, carries out the steady temporarily calculation and check of the On-line Control strategy that Fig. 1 step 2 generates.
If the temporarily steady check result of step 3 that what in Fig. 2, step 4 described is is safety and stability, then enter step 5; Otherwise, return step 1.
What in Fig. 2, step 5 described is according to temporary steady calculation and check result, forecast failure information, On-line Control strategy and relevant information (generator of Safety system monitoring in steady quantitative information, section moment, " mode word " and profile data temporarily and information on load) thereof are flushed in corresponding security control device, " significance bit " of this On-line Control strategy is set to " effectively " simultaneously.Wherein, temporarily steady quantitative information comprises the transient rotor angle stability dominant pattern relevant to the element that Safety system monitor and multiple dominant patterns and nargin, transient voltage dip safe weak node collection and nargin, Transient Voltage Stability weakness load collection and nargin and transient frequency and offsets safe weak node/generator collection and nargin.
What in Fig. 3, step 1 described is the whether existing On-line Control strategy of certain forecast failure in cycle detection security control device, if having, enters step 2; Otherwise, continue to detect.
What in Fig. 3, step 2 described is obtain up-to-date EMS state estimation real time data, WAMS real time data and Safety system real time data, re-starts the section data integration merging Safety system real time data, obtains new profile data.
What in Fig. 3, step 3 described is based on new profile data, carries out the steady temporarily calculation and check of this On-line Control strategy.
If the temporarily steady check result of step 3 that what in Fig. 3, step 4 described is is safety and stability, then enter step 5; Otherwise, enter step 6.
What in Fig. 3, step 5 described is according to temporary steady calculation and check result, the generator of monitoring to Safety system in this forecast failure and On-line Control policy-related (noun) temporarily steady quantitative information, section moment, " mode word " and profile data and information on load are flushed in corresponding security control device, " significance bit " of this On-line Control strategy is set to " effectively " simultaneously.
What in Fig. 3, step 6 described is set to engineering noise by this On-line Control strategy " significance bit ".
What in Fig. 4, step 1 described is whether cycle detection forecast failure occurs, if detect, forecast failure occurs, then enter step 2; Otherwise, continue to detect.
If what in Fig. 4, step 2 described is that in security control device, this On-line Fault control strategy " significance bit " is " effectively ", the duration that the corresponding profile data moment, apart from fault, occurs the moment is less than set point, and " mode word " that " the mode word " of On-line Control strategy and the security control device nearest moment before fault surveys is identical, then enter step 3; Otherwise, enter step 6.
What in Fig. 4, step 3 described is how according to relevant to this On-line Fault control strategy steady quantitative information temporarily preserved in security control device, generator, the information of load in corresponding profile data of Safety system monitoring, and generator, the load data of moment actual measurement recently before fault occurs, implement the transient rotor angle stability nargin after On-line Control strategy under estimating this fault , transient voltage dip margin of safety , Transient Voltage Stability nargin with transient frequency skew margin of safety .Concrete computing formula is shown in formula (1)-(4).
(1)
(2)
(3)
(4)
In formula (1), N is the generator number of units of Safety system monitoring, and m is for implementing this fault transient angle stability dominant pattern after On-line Control measure, and the pattern that several stability margins and dominant pattern nargin difference are less than the secondary dominant pattern of set point is total, be that i-th generator hives off the stability margin of pattern, be that i-th generator hives off the participation factors of jth platform generator in pattern, Critical Group generator participation factors is just, remaining mass-sending motor participation factors is negative, for meritorious the exerting oneself of Safety system jth platform generator of nearest moment actual measurement before fault, for the meritorious of this generator in the profile data that this On-line Control strategy is corresponding is exerted oneself, for this generated power is exerted oneself maximum, a is the coefficient of setting, for ( ) minimum value.
In formula (2), n is the weak load bus sum of transient voltage dip safety of Safety system monitoring, for the transient voltage dip margin of safety of i-th node in weak node, , for the apparent power of Safety system load bus i of nearest moment actual measurement before fault, for the apparent power of this load bus in the profile data that this On-line Control strategy is corresponding, if with be 0, then remove this load bus in calculating, if be not 0, then be taken as , otherwise be taken as , b is the coefficient of setting, for ( ) minimum value.
In formula (3), k is the weak load sum of Transient Voltage Stability of Safety system monitoring, for the Transient Voltage Stability nargin of i-th load in weak load, , for the apparent power of Safety system load i of nearest moment actual measurement before fault, for the apparent power of this load in the profile data that this On-line Control strategy is corresponding, for the apparent power of this load in the profile data that this On-line Control strategy is corresponding, if with be 0, then remove this load in calculating, if be not 0, then be taken as , otherwise be taken as , c is the coefficient of setting, for ( ) minimum value.
In formula (4), l is that the transient frequency of Safety system monitoring offsets weak generator and load sum, for the transient frequency offset margin of i-th generator or load in weak generator, load, , for the Safety system nearest generator of moment actual measurement or active power of load i before fault, for the active power of this generator or load in the profile data that this On-line Control strategy is corresponding, if with be 0, then remove this generator or load in calculating, if be not 0, then be taken as , otherwise be taken as , d is the coefficient of setting, for ( ) minimum value.
If what in Fig. 4, step 4 described is that transient rotor angle stability nargin, transient voltage dip margin of safety, Transient Voltage Stability nargin and the transient frequency skew margin of safety estimated is greater than corresponding set point respectively, namely , , , , then step 5 is entered; Otherwise, enter step 6.
What in Fig. 4, step 5 described is select corresponding On-line Control strategy.
What in Fig. 4, step 6 described is select corresponding Off-line control strategy.

Claims (1)

1. electric power system steady emergency control strategy of on-line and off-line strategy automatic selecting method temporarily, comprises following content:
1) On-line Control policy calculation flow process: carry out power system operation section data integration in control centre's integrated application EMS state estimation real time data, WAMS real time data and safety stabilization control system real time data, and calculate the transient safe and stable emergency control strategy of on-line of the forecast failure that safety stabilization control system covers based on this profile data;
2) On-line Control strategy is checked and is issued flow process: in control centre's integrated application EMS state estimation real time data, WAMS real time data and safety stabilization control system real time data re-start power system operation section data integration, and based on this profile data, after carrying out considering the enforcement of On-line Control strategy, the transient safe and stable quantitative evaluation of this forecast failure is checked, if transient safe and stable can ensure, then by forecast failure information, On-line Control strategy and transient safe and stable quantitative information thereof, the section moment, " mode word ", in profile data, the generator of safety stabilization control system monitoring flushes in corresponding safety and stability control device to information on load, " significance bit " of this On-line Control strategy is set to " effectively " simultaneously, otherwise, abandon this On-line Control strategy, do not carry out the refreshing of On-line Control strategy,
Wherein, described On-line Control strategy check with issue flow process be one independently cycle calculations with judge flow process, once step 1 be detected) On-line Control policy calculation flow process generated On-line Control strategy, then re-start power system operation section data integration, and the transient safe and stable calculation and check of On-line Control strategy is carried out based on this profile data, if this On-line Control strategy, the transient safe and stable of corresponding forecast failure still can be guaranteed under new running status, then according to transient safe and stable calculation and check result, by forecast failure information, On-line Control strategy and transient safe and stable quantitative information thereof, the section moment, " mode word ", in profile data, the generator of safety stabilization control system monitoring flushes in corresponding safety and stability control device to information on load, " significance bit " of this On-line Control strategy is set to " effectively " simultaneously, otherwise, abandon this On-line Control strategy, do not carry out the refreshing of On-line Control strategy, wherein, transient safe and stable quantitative information comprises the transient rotor angle stability dominant pattern relevant to the element that safety stabilization control system is monitored and multiple dominant patterns and nargin, transient voltage dip safe weak node collection and nargin, the weak load collection of Transient Voltage Stability and nargin and transient frequency and offsets safe weak node/generator collection and nargin,
3) in safety and stability control device, On-line Control strategy validity checks flow process: in control centre's integrated application EMS state estimation real time data, WAMS real time data and safety stabilization control system real time data re-start section data integration, and based on this profile data, carry out the transient safe and stable quantitative evaluation after considering the On-line Control strategy enforcement in safety and stability control device to check, if transient safe and stable can ensure, then by the transient safe and stable quantitative information relevant to this forecast failure, the section moment, in " mode word " and profile data, the generator of safety stabilization control system monitoring flushes in corresponding safety and stability control device to information on load, " significance bit " of this On-line Control strategy is set to " effectively " simultaneously, otherwise, " significance bit " of this On-line Control strategy is set to engineering noise,
Wherein, in described safety and stability control device On-line Control strategy validity check flow process be also one independently cycle calculations with judge flow process, once detect in safety stabilizing devices and save On-line Control strategy, then re-start section data integration, and the transient safe and stable calculation and check of On-line Control strategy is carried out based on this profile data, if the On-line Control strategy preserved in safety and stability control device, the transient safe and stable of corresponding forecast failure still can be guaranteed under new running status, then according to calculation and check result, by the transient safe and stable quantitative information relevant to this fault, the section moment, in " mode word " and profile data, the generator of safety stabilization control system monitoring flushes in corresponding safety and stability control device to information on load, " significance bit " of this On-line Control strategy is set to " effectively " simultaneously, otherwise, " significance bit " of this On-line Control strategy is set to engineering noise,
4) there is the selection flow process of strategy of on-line and off-line strategy in rear safety and stability control device in forecast failure: when safety and stability control device detects that forecast failure occurs, if " significance bit " of this On-line Fault control strategy is " effectively " in safety and stability control device, the duration that the corresponding profile data moment, apart from fault, occurs the moment is less than set point, " mode word " that its " mode word " and the safety and stability control device nearest moment before fault surveys is identical, and calculate the transient state merit angle after operation states of electric power system change based on safety stabilization control system measured data, voltage and frequency security stability margin are greater than corresponding set point respectively, then select corresponding On-line Control strategy, otherwise, adopt corresponding Off-line control strategy,
Wherein, after described forecast failure occurs, in safety and stability control device, the selection flow process of On-line Control strategy and Off-line control strategy is independently cycle calculations and a selection flow process, safety and stability control device is once detect that forecast failure occurs, then make the following judgment immediately: if " significance bit " of this On-line Fault control strategy is " effectively " in safety and stability control device, the duration that the corresponding profile data moment, apart from fault, occurs the moment is less than set point, " mode word " that its " mode word " and the safety and stability control device nearest moment before fault surveys is identical, and based on safety stabilization control system measured data, transient rotor angle stability nargin η ' is calculated according to formula (1)-(4) a, transient voltage dip margin of safety η ' vd, Transient Voltage Stability nargin η ' vswith transient frequency skew margin of safety η ' fbe greater than corresponding set point respectively, then select On-line Control strategy, otherwise, adopt Off-line control strategy:
In formula (1), N is the generator number of units of safety stabilization control system monitoring, m is for implementing this fault transient angle stability dominant pattern after On-line Control measure, and the pattern that several stability margins and dominant pattern nargin difference are less than the secondary dominant pattern of set point is total, η a.ibe that i-th generator hives off the stability margin of pattern, λ j.ibe that i-th generator hives off the participation factors of jth platform generator in pattern, leading mass-sending motor participation factors just be, and remaining to mass-send motor participation factors be negative, P ' g.jfor meritorious the exerting oneself of safety stabilization control system jth platform generator of nearest moment actual measurement before fault, P g.jfor the meritorious of this generator in the profile data that this On-line Control strategy is corresponding is exerted oneself, P gmax.jfor this generated power is exerted oneself maximum, a is the coefficient of setting; η ' afor η ' a.i(i=1,2 ..., minimum value m);
In formula (2), n is the weak load bus sum of transient voltage dip of safety stabilization control system monitoring, η vd.ifor the transient voltage dip margin of safety of i-th load bus in weak node, η vd.1≤ ... ≤ η vd.n, S ' ifor the apparent power of safety stabilization control system i-th load bus of nearest moment actual measurement before fault, S ifor the apparent power of this load bus in the profile data that this On-line Control strategy is corresponding, if S ibe not 0, S " ibe taken as S i, otherwise S " ibe taken as S ' i, b is the coefficient of setting; η ' vdfor η ' vd.i(i=1,2 ..., minimum value n);
In formula (3), k is the weak load sum of Transient Voltage Stability of safety stabilization control system monitoring, η vs.ifor the Transient Voltage Stability nargin of i-th load in weak load, η vs.1≤ ... ≤ η vs.k, S ' l.ifor the apparent power of safety stabilization control system i-th load of nearest moment actual measurement before fault, S l.ifor the apparent power of this load in the profile data that this On-line Control strategy is corresponding, if S l.ibe not 0, S " l.ibe taken as S l.i, otherwise S " l.ibe taken as S ' l.i, c is the coefficient of setting; η ' vsfor η ' vs.i(i=1,2 ..., minimum value k);
In formula (4), l is that the transient frequency of safety stabilization control system monitoring offsets weak generator and load sum, η f.ifor the transient frequency offset margin of i-th generator or load in weak generator, load, η f.1≤ ... ≤ η f.l, P ' ifor safety stabilization control system nearest i-th generator of moment actual measurement or active power of load before fault, P ifor the active power of this generator or load in the profile data that this On-line Control strategy is corresponding, if P ibe not 0, P " ibe taken as P i, otherwise P " ibe taken as P ' i, d is the coefficient of setting, η ' ffor η ' f.i(i=1,2 ..., minimum value l).
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