CN102347613A - 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 PDFInfo
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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
Technical field
The invention belongs to power system safety and stability control technology field, be applicable to how the transient safe and stable emergency control system selects strategy of on-line or off-line strategy automatically.
Background technology
Changeable along with the expansion of electric power system scale and operational mode; Transient safe and stable (being called for short: the steady temporarily) emergency control policy of formulating through off-line analysis is difficult to realize optimal control; Even be difficult to guarantee the security and stability of electric power system; Need take online calculation mode to calculate the strategy of on-line of temporarily steady emergency control according to the actual motion state of electric power system.However, to determine transient stability control strategy requires a certain online computing time, assuming an average period
(usually a few minutes), which requires online control strategy
to 2
time to adapt to changes in the state power system operation, in order to truly realize the control strategy according to the control line to ensure the safety of the power system transient stability.In fact, the running status of electric power system is constantly to change, and the temporarily steady characteristic variations of electric power system maybe be bigger within several minutes, and the On-line Control strategy of formulating based on the operation states of electric power system before several minutes possibly not satisfy temporarily steady requirement.For this reason; Patent " the power system safety stabilization emergency control policy automatically matching method " (patent No.: ZL200710135095.8) the give chapter and verse definition of " mode word " (for example equipment is thrown/moved back) in the safety and stability control device (be called for short: peace control device); Confirm that the Operation of Electric Systems section corresponding with being created on the line traffic control strategy (is called for short: " the mode word " of data section); When forecast failure takes place; By " the mode word " and peace control device nearest " mode word " of actual measurement constantly before fault of coupling On-line Control strategy, avoid the incompatibility problem of On-line Control strategy.In fact, in the electric power system of safety and stability characteristic complicacy, be difficult to (be called for short: propose suitable " mode word " peace control system), guarantee the reliability that On-line Control strategy and off-line control strategy are selected at safety stabilization control system.
Three links such as the validity check of the present invention's On-line Control strategy from On-line Control policy distribution, peace control device and control strategy selection improve the reliability of On-line Control strategy and the selection of off-line control strategy.In On-line Control policy distribution link, increased the adaptability judgement of carrying out this control strategy after the On-line Control strategy generates immediately based on current profile data,, be not issued in the peace control device for not guaranteeing steady On-line Control strategy temporarily; For the On-line Control strategy that is issued to peace control device, increased and constantly carried out the flow process that On-line Control strategy validity is checked based on new profile data; Select link at On-line Control strategy and off-line control strategy; Propose POWER SYSTEM STATE based on temporarily steady quantification theory and change computational methods temporarily steady nargin influence degree; Increased under the condition that the estimated value of considering temporarily steady nargin behind the peace control system real measured data need meet the demands, just possibly be chosen in the line traffic control strategy.
Summary of the invention
The present invention seeks to: accurately judge the adaptability that temporarily steady emergency control On-line Control strategy changes operation states of electric power system, improve the reliability that On-line Control strategy and off-line control strategy are selected.
The present invention adopts following technical scheme to realize, comprises the steps:
1) On-line Control policy calculation flow process: integrated application EMS state estimation real time data, WAMS real time data and peace control system real time data are carried out section data integration in the control centre, and calculate the temporarily steady emergency control strategy of on-line of the forecast failure that peace control system covered based on this profile data.
2) the On-line Control strategy is checked and is issued flow process: the integrated application EMS state estimation real time data in the control centre; WAMS real time data and peace control system real time data are carried out section data integration again; And based on this profile data; Consider the On-line Control strategy implement after the temporarily steady quantitative evaluation of this forecast failure; If surely can guarantee temporarily; Then with forecast failure information; On-line Control strategy and relevant information thereof (temporarily steady quantitative information; Section constantly; The generator and the information on load of peace control system monitoring in " mode word " and the profile data) (be called for short: peace control device), " significance bit " with this On-line Control strategy is changed to " effectively " simultaneously to flush to corresponding safety and stability control device; Otherwise, abandon this On-line Control strategy, do not carry out the On-line Control strategy and refresh.
3) validity of On-line Control strategy is checked flow process in the peace control device: the integrated application EMS state estimation real time data in the control centre; WAMS real time data and peace control system real time data are carried out section data integration again; And based on this profile data; Consider to pacify the temporarily steady quantitative evaluation after the On-line Control strategy of controlling in the device is implemented; If surely can guarantee temporarily; Information that will be relevant (temporarily steady quantitative information then with this forecast failure; Section constantly; The generator and the information on load of peace control system monitoring in " mode word " and the profile data) flush in the corresponding peace control device, " significance bit " with this On-line Control strategy is changed to " effectively " simultaneously; Otherwise, " significance bit " of this On-line Control strategy is changed to engineering noise.
4)? Envisioned after a failure in the security control devices and offline strategies online strategy selection process: When the security control unit detects a fault has occurred envisioned, security control device if the fault-line control strategy of the "significant" to " effective ", the corresponding cross-section moment at failure time data length of time than the set value, the" way of the word "security control device with the most recent time before failure measured" way the word "same, and security control system based on measured data to calculate the operating state of the power system transient stability changes in the degree of influence meet the requirements, then choose the appropriate control strategies online; otherwise, with the corresponding offline control strategy.
Effect and advantage:
One aspect of the present invention effectively reduces peace control device and selects the probability that does not satisfy the On-line Control strategy that surely requires temporarily for use through based on new profile data the On-line Control strategy being carried out steady temporarily check; Pass through on the other hand in On-line Control strategy and off-line control strategy link; Theoretical based on temporarily steady quantitative analysis; Estimated and considered to pacify the generator output of control system monitoring in real time and the temporarily steady nargin after the load variations, can significantly improve the reliability of control strategy selection.The present invention is with the practical applications of the temporarily steady emergency control technology of big force urges scale grid line.
Description of drawings
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 an On-line Control policy calculation flow process; Fig. 2 is that flow process is checked and issued to the On-line Control strategy; Fig. 3 checks flow process to the validity of On-line Control strategy in the peace control device, and Fig. 4 is the selection flow process that On-line Control strategy and off-line control strategy in the back peace control device take place forecast failure.About the check flow process of Fig. 3, need explanation 2 points, the one, as long as in the peace control device On-line Control strategy is arranged, even without refreshing, the execution that still need circulate of this check flow process; The 2nd, controlling to peace in the validity check process of On-line Control strategy in the device; If detecting new On-line Control strategy has flushed in the peace control device; Then end the ongoing validity that refreshes preceding On-line Control strategy immediately and check, start to the validity of new On-line Control strategy and check.
Be that example describes below,, then take the parallel processing mode for a plurality of forecast failures by a forecast failure.
What step 1 was described among Fig. 1 is that integrated application EMS state estimation real time data, WAMS real time data and peace control system real time data are carried out section data integration in the control centre.
What step 1 was described among Fig. 2 is the On-line Control strategy generation that whether forecast failure has a new round in cycle detection Fig. 1 On-line Control policy calculation flow process; If the On-line Control strategy of forecast failure generates; Even the On-line Control strategy also gets into step 2 with last round of identical; Otherwise, continue to detect.
What step 2 was described among Fig. 2 is to obtain up-to-date EMS state estimation real time data, WAMS real time data and peace control system real time data, merges the section data integration of peace control system real time data again, obtains new profile data.
Step 3 is described among Fig. 2 is based on new profile data, carries out steady temporarily check of the On-line Control strategy that Fig. 1 step 2 generates and calculates.
What step 4 was described among Fig. 2 is if the temporarily steady check result of step 3 is safety and stability, then gets into step 5; Otherwise, return step 1.
What step 5 was described among Fig. 2 is according to surely checking result of calculation temporarily; Forecast failure information, On-line Control strategy and relevant information thereof (generator and the information on load of peace control system monitoring in temporarily steady quantitative information, the section moment, " mode word " and the profile data) are flushed in the corresponding peace control device, and " significance bit " with this On-line Control strategy is changed to " effectively " simultaneously.Wherein, temporarily steady quantitative information comprises that the transient state angle stability dominant pattern relevant with the element of peace control system monitoring and a plurality of dominant patterns and nargin, transient voltage fall load collection and nargin and transient frequency of safe weak node collection and nargin, the stable weakness of transient voltage and be offset safe weak node/generator collection and nargin.
Step 1 is described among Fig. 3 is certain forecast failure existing On-line Control strategy whether in the cycle detection peace control device, if having, gets into step 2; Otherwise, continue to detect.
What step 2 was described among Fig. 3 is to obtain up-to-date EMS state estimation real time data, WAMS real time data and peace control system real time data, merges the section data integration of peace control system real time data again, obtains new profile data.
Step 3 is described among Fig. 3 is based on new profile data, carries out steady temporarily check of this On-line Control strategy and calculates.
What step 4 was described among Fig. 3 is if the temporarily steady check result of step 3 is safety and stability, then gets into step 5; Otherwise, get into step 6.
What step 5 was described among Fig. 3 is according to surely checking result of calculation temporarily; To flush in the corresponding peace control device with the generator and the information on load of peace control system monitoring in this forecast failure and the temporarily steady quantitative information of On-line Control policy-related (noun), the section moment, " mode word " and the profile data, " significance bit " with this On-line Control strategy is changed to " effectively " simultaneously.
Step 6 is described among Fig. 3 is that " significance bit " with this On-line Control strategy is changed to engineering noise.
What step 1 was described among Fig. 4 is whether the cycle detection forecast failure takes place, if detecting forecast failure takes place, then gets into step 2; Otherwise, continue to detect.
What step 2 was described among Fig. 4 is if " significance bit " of this On-line Fault control strategy is " effectively " in the peace control device; Duration constantly takes place less than set point apart from fault in corresponding profile data constantly; And " the mode word " of On-line Control strategy is identical with " mode word " that peace control device is surveyed before fault recently constantly, then gets into step 3; Otherwise, get into step 6.
Described in step 3 in Figure 4 is how the security control device and stored in the fault-line transient stability control strategy relevant quantitative information security control system monitors the generator load the appropriate information in the data section, and the fault occurred before the most recent measured time generators, load data, to estimate the fault-line control strategy implemented under the transient angle stability margin
, transient voltage drop margin of safety
, transient voltage stability margin
and transient frequency deviation shift safety margin
.Concrete computing formula is seen formula (1)-(4).
Formula (1), N is the security control system to monitor the number of generator sets, m-line control measures for the implementation of fault transient angle stability of the dominant model, as well as a number of stability margin and margin of difference is less than dominant mode setting value of the total number of sub-dominant pattern of patterns,
i-th generator clustering mode stability margin,?
i-th generator grouping mode j-generator participation factor, critical group generator participation factor is positive, the remaining group generator participation factor is negative,
for the security control system in recent times measured before the failure of the j generator active power output,
control strategy for online data in the corresponding section of the generator active power output,
for the generator active power output Max, a is the coefficient set,
is
(
) a minimum.
Formula (2), n is the security control system monitors the load transient voltage drop insecurity total number of nodes,
is weak nodes of node i transient voltage drop margin of safety,
,
for the security control system in recent time before failure node i is the measured load apparent power,
control strategy for the online section data corresponding node in the load apparent power, if
and
are 0, then calculate the load nodes removed, if
is not 0, then the
is taken as
Otherwise
is taken as
, b is the coefficient set,
is
(
) the minimum.
Formula (3), k is the security control system to monitor the total load transient voltage stability is weak,
is weak load in the i-th load transient voltage stability margin,
,
for the security control system in recent times measured before the failure load i is the apparent power,
control strategy for online data in the corresponding section of the load apparent power,
control strategy for online data in the corresponding section of the load apparent power, if
and
are 0, then the calculation to remove The load, if
is not 0, then
is taken as
, or
is taken as
, c is the set coefficient,
is
(
) the minimum.
Formula (4) in, l the security control system to monitor the frequency offset weak transient generators and loads total,
generator is weak, the load in the generator or the i-th frequency offset of the transient load margin,
,
is security control system in recent time before failure measured active power generator or load i,
control strategy for online data in the corresponding section of the active power generator or load, if
and
are 0, then remove the power calculation machine or the load, if
is not 0, then
is taken as
, or
is taken as
, d is the set coefficient,
is
(
) the minimum.
Figure 4 is described in Step 4 If the estimate of the transient angle stability margin, transient voltage drop margin of safety, transient voltage stability margin and transient frequency offset safety margins were greater than the corresponding setting that
,
,
,
, the process proceeds to step 5; otherwise, go to step 6.
What step 5 was described among Fig. 4 is to select the corresponding online control strategy for use.
What step 6 was described among Fig. 4 is to select corresponding off-line control strategy for use.
Claims (4)
1. temporarily steady emergency control strategy of on-line of electric power system and off-line strategy automatic selecting method may further comprise the steps:
On-line Control policy calculation flow process: integrated application EMS state estimation real time data, WAMS real time data and safety stabilization control system in the control centre (be called for short: peace control system) real time data is carried out the power system operation section, and (be called for short: section) data are integrated, and calculate transient safe and stable (being called for short: steady temporarily) the emergency control strategy of on-line of the forecast failure that peace control system covered based on this profile data;
The On-line Control strategy is checked and is issued flow process: the integrated application EMS state estimation real time data in the control centre; WAMS real time data and peace control system real time data are carried out section data integration again; And based on this profile data; Consider the On-line Control strategy implement after the temporarily steady quantitative evaluation of this forecast failure; If surely can guarantee temporarily; Then with forecast failure information; On-line Control strategy and relevant information thereof (temporarily steady quantitative information; Section constantly; The generator and the information on load of peace control system monitoring in " mode word " and the profile data) (be called for short: peace control device), " significance bit " with this On-line Control strategy is changed to " effectively " simultaneously to flush to corresponding safety and stability control device; Otherwise, abandon this On-line Control strategy, do not carry out the On-line Control strategy and refresh;
The validity of On-line Control strategy is checked flow process in the peace control device: the integrated application EMS state estimation real time data in the control centre; WAMS real time data and peace control system real time data are carried out section data integration again; And based on this profile data; Consider to pacify the temporarily steady quantitative evaluation after the On-line Control strategy of controlling in the device is implemented; If surely can guarantee temporarily; Information that will be relevant (temporarily steady quantitative information then with this forecast failure; Section constantly; The generator and the information on load of peace control system monitoring in " mode word " and the profile data) flush in the corresponding peace control device, " significance bit " with this On-line Control strategy is changed to " effectively " simultaneously; Otherwise, " significance bit " of this On-line Control strategy is changed to engineering noise;
Expected after the failure security control device online and offline strategies strategy selection process: When the security control unit detects a fault has occurred envisioned, security control device if the fault-line control strategy of the "significant" to "active", the corresponding sectional data from the moment of failure time duration is less than the set value, the "way of the word" security control device with the most recent time before failure measured "way the word" same, and security control system based on measured data to calculate the operating state of the power system changes in the degree of influence on the transient stability to meet the requirements, the selection of the appropriate line control strategy; Otherwise, use the appropriate line control strategy.
2. require temporarily steady emergency control strategy of on-line of described electric power system and off-line strategy automatic selecting method according to right 1; It is characterized in that; Step 2) check of On-line Control strategy is independently a cycle calculations and judgement flow process with issuing flow process; Generated the On-line Control strategy in case detect step 1) On-line Control policy calculation flow process; Then carry out section data integration again; And carry out surely checking temporarily of On-line Control strategy based on this profile data and calculate; If this On-line Control strategy; Under new running status, still can guarantee the transient safe and stable of corresponding forecast failure; Then according to surely checking result of calculation temporarily; With forecast failure information; On-line Control strategy and relevant information thereof (temporarily steady quantitative information; Section constantly; The generator and the information on load of peace control system monitoring in " mode word " and the profile data) flush in the corresponding peace control device, " significance bit " with this On-line Control strategy is changed to " effectively " simultaneously; Otherwise, abandon this On-line Control strategy, do not carry out the On-line Control strategy and refresh; Wherein, temporarily steady quantitative information comprises that the transient state angle stability dominant pattern relevant with the element of peace control system monitoring and a plurality of dominant patterns and nargin, transient voltage fall load collection and nargin and transient frequency of safe weak node collection and nargin, the stable weakness of transient voltage and be offset safe weak node/generator collection and nargin.
3 claimed in claim 1 wherein the power system transient stability emergency control strategies online and offline strategies automatic selection method, wherein the step 3)? Security control device online checking the validity of the process control strategy is also a separate cycle calculation and judgment process, upon detection of the security control device stored in the line control strategy, the re-integration section data and section data based on the on-line transient stability control policy checking calculation, if stored in the security control line control apparatus strategy in the new operating conditions able to ensure appropriate security and stability expected transient faults, then check the results based on the information associated with the fault (transient stability quantitative information, the cross section moment, "the word means," and Section data security control system monitors the generator and load information) flushed to the corresponding security control device, while the online control strategy of the "significant" is set to "active"; Otherwise, the line control strategy of the "significant" is set to "invalid."
As claimed in claim 1 wherein the power system transient stability emergency control strategies online and offline strategies automatic selection method, wherein step 4)? Expected after a failure in the security control unit control strategies online and offline control strategy selection process is an independent loop calculation and selection processes, security control device upon detection of expected failure has occurred, immediately following judgments: If the security control unit the fault-line control strategy of the "significant" to "active", the corresponding cross-section moments of failure time data from the length of time less than the set value, the "way of the word" security control device with the most recent time before failure measured "way the word" same, and security control system based on measured data, according to the formula (1) - ( 4) to calculate the transient angle stability margin, transient voltage drop margin of safety, transient voltage stability margin and transient frequency offset safety margins were greater than the corresponding set value, then use online control strategies; otherwise , the use of off-line control strategy;
Formula (1), N is the security control system to monitor the number of generator sets, m-line control measures for the implementation of fault transient angle stability of the dominant model, as well as a number of stability margin and margin of difference is less than dominant mode setting value of the total number of sub-dominant pattern of patterns,
i-th generator clustering mode stability margin,
i-th generator grouping mode j-generator participation factor, critical group generator participation factor is positive, and the remaining group generator participation factor is negative,
for the security control system in recent times measured before the failure of the j generator active power output,
for online control strategy in the corresponding section data generator active power output,
maximum value for the generator active power output, a is the set of coefficients;
Formula (2), n is the security control system monitors the load transient voltage drop weak total number of nodes,
is weak nodes of node i transient voltage drop margin of safety,
,
is the security control system in the last moments before the failure load of node i is the measured apparent power,
control strategy for the online section data corresponding node in the load apparent power, if
is not 0,
is taken as
, or
is taken as
, b is the set coefficient;
Formula (3), k is the security control system to monitor the total load transient voltage stability is weak,
is weak load in the i-th load transient voltage stability margin,
,
for the security control system in recent time before failure load i is the measured apparent power,
control strategy for online data in the corresponding section of the load apparent power, if
Not is 0,
is taken as
, or
is taken as
, c is the set coefficient;
Formula (4) in, l the security control system to monitor the frequency offset weak transient generators and loads total,
is weak generators, load in the i-th generator or load transient frequency offset margin,
,
for the security control system malfunction before the most recent time i measured active power generator or load,
control strategy for the online data of the corresponding sections active power generator or load, if
is not 0,
is taken as
, or
is taken as
, d is the set factor.
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