CN101969202A - Method for recognizing transmission section power limit interval of power system transient stability - Google Patents
Method for recognizing transmission section power limit interval of power system transient stability Download PDFInfo
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Abstract
The invention discloses a method for recognizing a transmission section power limit interval of power system transient stability, which comprises the steps of: respectively carrying out transient security stability evaluation on faults in a transmission section transient security stability check fault set by adopting a transient angle stability quantitative evaluation method and a transient voltage security stability quantitative evaluation method to obtain a transient angle stability mode and a transient voltage security stability mode of each fault; respectively calculating impact factors of each generator and each load to the transmission section power limit according to participation factors of the generators and the load, the sensitivity of the power to the transmission section power, the transient angle stability margin and the transient voltage security stability margin; and calculating the minimum value and the maximum value of the transmission section power limit through regulating powers of the generators and the loads according to the impact factors of the generators and the loads to the transmission section power limit.
Description
Technical field
The invention belongs to electric power system calculating and analysis technical field.
Background technology
Transmission cross-section power is the key index that the power system dispatching operations staff monitors the electric power netting safe running level, it is one of important content of power system safety and stability economical operation and control that Transient Security for Power Systems stable cross section limit power is calculated with analyzing, current power transmission section power limit account form is the power adjustment mode that the dispatching of power netwoks operations staff rule of thumb determines generator, load earlier, calculate by the transient safe and stable time-domain-simulation again, finally determine the power limit of transmission cross-section.In fact, the operational mode of transmission cross-section power limit and electrical network and power adjustment mode are closely related, that is to say, if it is inconsistent with the power adjustment mode that is provided with by rule of thumb that the generator of electrical network actual motion, load power are adjusted mode, then the transmission cross-section power limit of calculating by present account form may be very conservative, also might advance rashly very much.
Along with the continuous increase of generation of electricity by new energy scale and the progressively propelling of electricity market, the adjustment mode of generator is difficult to preestablish by management and running personnel's requirement, in addition, the variation of bus load also is difficult to accurately prediction, and the ratio of the relative variation between the different bus loads is difficult to prediction especially.Therefore, the account form of present transmission cross-section power limit is badly in need of improving.Because the operational mode and the power adjustment mode of transmission cross-section power limit and electrical network are closely related, if can calculate the interval at transmission cross-section power limit place exactly, be power limit minimum value and power limit maximum, just can be the safe and stable operation of electrical network, particularly economical operation provides very important decision-making foundation.
Summary of the invention
The present invention seeks to: determine the power limit interval of electric power system transient stability transmission cross-section, the safety and stability economical operation for electrical network provides decision-making foundation.
The present invention adopts following technical scheme to realize, comprises the steps:
1) at the current operational mode of electrical network, adopt transient state angle stability quantitative estimation method and transient voltage safe and stable quantitative estimation method to concentrate each fault to carry out the transient safe and stable assessment respectively, obtain the transient state angle stability pattern (participation factors of each generator in the leading pattern of hiving off of transient state angle stability nargin, generator, critical electric power generator group and the remaining electric power generator group) and the transient voltage safe and stable pattern (transient voltage safe and stable nargin, load participation factors) of each fault transmission cross-section transient safe and stable examination fault;
2) according to the participation factors of generator, load, power the sensitivity of transmission cross-section power and transient state angle stability nargin, transient voltage safe and stable nargin are calculated every adjustable generator, each deferrable load factor of influence to the transmission cross-section power limit;
3) if calculate the minimum value of transmission cross-section power limit, then enter the 4th) step, if calculate the maximum of transmission cross-section power limit, then enter the 5th) step;
4) according to generator and the factor of influence of load to the transmission cross-section power limit, be identified for calculating the adjustment mode of the sending of the interval lower limit of transmission cross-section power limit (minimum value), receiving end generator and load, adopt iterative manner to calculate the minimum value of transmission cross-section power limit;
5) according to generator and the factor of influence of load to the transmission cross-section power limit, be identified for calculating the adjustment mode of the sending of the interval upper limit of transmission cross-section power limit (maximum), receiving end generator and load, adopt iterative manner to calculate the maximum of transmission cross-section power limit.
Beneficial effect of the present invention is, the present invention is based on the transient state angle stability pattern and the transient voltage safe and stable pattern of transmission cross-section examination fault, generator and the load factor of influence computational methods to the transmission cross-section power limit are proposed respectively, and considered the actual adjustment space of adjustable generator and load, and the input of generator and withdrawing from, provided the computational methods in transmission cross-section transient safe and stable limit power interval under the current operational mode of electrical network.The present invention has overcome electric power system calculating and the analyst is provided with the shortcoming that power adjustment mode is calculated the transmission cross-section power limit by rule of thumb, it may be very conservative having solved the transmission cross-section power limit that this account form calculates, it also might be the problem that advances rashly very much, can be the safe and stable operation of electrical network, particularly economical operation provides very important decision-making foundation.
Description of drawings
Fig. 1 is the flow chart of the inventive method.
Embodiment
Below in conjunction with accompanying drawing 1, the inventive method is described in detail.
Step 1 is described among Fig. 1 is transient safe and stable quantitative evaluation at the current operational mode of electrical network, promptly at the current operational mode of electrical network, adopt transient state angle stability quantitative estimation method and transient voltage safe and stable quantitative estimation method to concentrate each fault to carry out the transient safe and stable assessment respectively, obtain transient state angle stability pattern (the transient state angle stability nargin of each fault transmission cross-section transient safe and stable examination fault, the leading pattern of hiving off of generator, the participation factors of each generator in critical electric power generator group and the remaining electric power generator group) and transient voltage safe and stable pattern (transient voltage safe and stable nargin, the load participation factors).
What step 2 was described among Fig. 1 is that generator, load calculate the factor of influence of the section transmitted power limit, promptly according to the participation factors of generator, load, power to the sensitivity of transmission cross-section power and transient state angle stability nargin, transient voltage safe and stable nargin, adopt formula (1), formula (2) to come the adjustable generator of rated output and deferrable load factor of influence respectively to transient safe and stable transmission cross-section power limit.
Wherein, m concentrates number of faults, p for transmission cross-section transient safe and stable examination fault
G.ijBe the transient state angle stability participation factors (critical mass-sending motor participation factors is greater than 0, and remaining mass-sending motor participation factors is less than 0) of generator i under the fault j, η
A.jBe transient state angle stability nargin under the fault j, s
G.iChange the sensitivity that causes that transmission cross-section active power changes for generator i active power; p
L.ijBe the transient voltage safe and stable participation factors of load i under the fault j, η
V.jBe transient voltage safe and stable nargin under the fault j, s
L.iFor load i active power changes the sensitivity that causes that transmission cross-section active power changes.
What step 3 was described among Fig. 1 is the division of the interval upper lower limit value Branch Computed of transmission cross-section power limit, even calculate the interval lower limit (minimum value) of transmission cross-section power limit, then enter step 4,, then enter step 5 if calculate the interval upper limit (maximum) of transmission cross-section power limit.
What step 4 was described among Fig. 1 is the iterative computation flow process of the interval lower limit of transmission cross-section power limit, comprises for four steps:
The first step, determine to give, receiving end power is adjusted total amount: if first, then adopt the power of setting to adjust step-length, otherwise, power adjustment total amount is determined in the relation curve match that employing is adjusted total amount and transient safe and stable nargin based on power, if adjust step-length, then adopt the power of setting to adjust step-length greater than the power of setting.
Second step, determine to give, the power adjustment of receiving end generator and load: according to predefined sending end, receiving end generator and load adjustment order, for the adjustable generator of sending end, according to the factor of influence G of generator to transient safe and stable transmission cross-section power limit
i, increase factor of influence G from big to small successively
iBig generator power is for the deferrable load of sending end, according to the factor of influence L of load to transient safe and stable transmission cross-section power limit
i, reduce factor of influence L from small to large successively
iLittle load is adjusted total amount until the generator of sending end, the sending end power that the adjustment total amount of load equals to determine in the first step; For the adjustable generator of receiving end, according to the factor of influence G of generator to transient safe and stable transmission cross-section power limit
i, reduce factor of influence G from small to large successively
iLittle generator power is for the deferrable load of receiving end, according to the factor of influence L of load to transient safe and stable transmission cross-section power limit
i, increase factor of influence L from big to small successively
iBig load is adjusted total amount until the generator of receiving end, the receiving end power that the adjustment total amount of load equals to determine in the first step.
The 3rd step, carry out the transient safe and stable assessment: at sending of determining in going on foot by second, the power adjustment of receiving end generator and load generates new operational mode, adopt transient state angle stability quantitative estimation method and transient voltage safe and stable quantitative estimation method (to concentrate the transient safe and stable of some fault of existence not guarantee if the examination fault in limit search procedure, occurs to the concentrated remaining fault of transmission cross-section transient safe and stable examination fault, then filter out the examination fault and concentrate the fault that can keep transient safe and stable, the unwarrantable fault of these transient safe and stables as remaining fault) carry out transient safe and stable assessment respectively, obtain the transient state angle stability pattern and the transient voltage safe and stable pattern of each fault.
In the 4th step,, finish the calculation process of limit power minimum value if whether the error of section limit power then obtains the minimum value of limit power less than the threshold value of setting; Otherwise, according to the participation factors of generator, load, power the sensitivity of transmission cross-section power and transient state angle stability nargin, transient voltage safe and stable nargin are calculated every adjustable generator, each deferrable load factor of influence to the transmission cross-section power limit, return the first step.
What step 5 was described among Fig. 1 is the iterative computation flow process of the interval upper limit of transmission cross-section power limit, comprises for four steps:
The first step, determine to give, receiving end power is adjusted total amount: if first, then adopt the power of setting to adjust step-length, otherwise, power adjustment total amount is determined in the relation curve match that employing is adjusted total amount and transient safe and stable nargin based on power, if adjust step-length, then adopt the power of setting to adjust step-length greater than the power of setting.
Second step, determine to give, the power adjustment of receiving end generator and load: according to predefined sending end, receiving end generator and load adjustment order, for the adjustable generator of sending end, according to the factor of influence G of generator to transient safe and stable transmission cross-section power limit
i, increase factor of influence G from small to large successively
iLittle generator power is for the deferrable load of sending end, according to the factor of influence L of load to transient safe and stable transmission cross-section power limit
i, reduce factor of influence L from big to small successively
iBig load is adjusted total amount until the generator of sending end, the sending end power that the adjustment total amount of load equals to determine in the first step; For the adjustable generator of receiving end, according to the factor of influence G of generator to transient safe and stable transmission cross-section power limit
i, reduce factor of influence G from big to small successively
iBig generator power is for the deferrable load of receiving end, according to the factor of influence L of load to transient safe and stable transmission cross-section power limit
i, increase factor of influence L from small to large successively
iLittle load is adjusted total amount until the generator of receiving end, the receiving end power that the adjustment total amount of load equals to determine in the first step.
The 3rd step, carry out the transient safe and stable assessment: at sending of determining in going on foot by second, the power adjustment of receiving end generator and load generates new operational mode, adopt transient state angle stability quantitative estimation method and transient voltage safe and stable quantitative estimation method (to concentrate the transient safe and stable of some fault of existence not guarantee if the examination fault in limit search procedure, occurs to the concentrated remaining fault of transmission cross-section transient safe and stable examination fault, then filter out the examination fault and concentrate the fault that can keep transient safe and stable, the unwarrantable fault of these transient safe and stables as remaining fault) carry out transient safe and stable assessment respectively, obtain the transient state angle stability pattern and the transient voltage safe and stable pattern of each fault.
In the 4th step,, finish limit power Computation of Maximal Waiting flow process if whether the error of section limit power then obtains the maximum of limit power less than the threshold value of setting; Otherwise, according to the participation factors of generator, load, power the sensitivity of transmission cross-section power and transient state angle stability nargin, transient voltage safe and stable nargin are calculated every adjustable generator, each deferrable load factor of influence to the transmission cross-section power limit, return the first step.
In addition, also need to illustrate 2 points:
1) adjusting the space for exerting oneself of adjustable generator, is to determine according to the feasible zone that generator output in the setting-up time that begins from the time of current running status changes; For the adjustment space of deferrable load, be to determine according to the predicted value that the setting-up time internal loading that begins from the time of current running status changes.
2) if predefined sending end, receiving end generator and load adjustment comprise the throwing of generator/stop in proper order, then in second step of limit power minimum value and maximum value calculation branch, adjusting total amount for power does not reach sending of determining in the first step, receiving end power and adjusts total amount and just need the situation that drops into generator or withdraw from generator, when power adjustment increases to needs input generator or withdraws from generator, then no longer further increase power adjustment.In the transient safe and stable assessment in the 3rd step, at first do not contain the transient safe and stable assessment that generator is thrown/stopped, can not guarantee as if transient safe and stable, directly entered for the 4th step; Otherwise, according to the throwing of generator/stop order, drop into a generator or withdraw from a generator, and according to second the step the adjustment mode correspondingly adjust generator, the power of load is with the balance of guaranteed output, carry out the transient safe and stable assessment again, if transient safe and stable can not guarantee, and after this generator input or the power before withdrawing from be the minimum power of keeping the normal operation of generator, then after this generator input or the section performance number before withdrawing from as the minimum value or the maximum of limit power, finish the minimum value or the maximum value calculation flow process of corresponding limit power; Otherwise, entered for the 4th step.
Claims (4)
1. the recognition methods in electric power system transient stability transmission cross-section power limit interval may further comprise the steps:
1) at the current operational mode of electrical network, adopt transient state angle stability quantitative estimation method and transient voltage safe and stable quantitative estimation method to concentrate each fault to carry out the transient safe and stable assessment respectively to transmission cross-section transient safe and stable examination fault, obtain the transient state angle stability pattern and the transient voltage safe and stable pattern of each fault, wherein, transient state angle stability pattern comprises transient state angle stability nargin, the leading pattern of hiving off of generator, the participation factors of each generator in critical electric power generator group and the remaining electric power generator group, the transient voltage safe and stable pattern comprises transient voltage safe and stable nargin, the load participation factors;
2) according to the participation factors of generator, load, power the sensitivity of transmission cross-section power and transient state angle stability nargin, transient voltage safe and stable nargin are calculated every adjustable generator, each deferrable load factor of influence to the transmission cross-section power limit;
3) if calculate the interval lower limit of transmission cross-section power limit, promptly minimum value then enters the 4th) step, if calculate the interval upper limit of transmission cross-section power limit, promptly maximum then enters the 5th) step;
4) according to generator and load to the factor of influence of transmission cross-section power limit, be identified for calculating the adjustment mode of the sending of transmission cross-section power limit minimum value, receiving end generator and load, adopt iterative manner to calculate the minimum value of transmission cross-section power limit;
5) according to generator and load to the factor of influence of transmission cross-section power limit, be identified for calculating that the transmission cross-section power limit is peakedly sent, the adjustment mode of receiving end generator and load, adopt iterative manner to calculate the maximum of transmission cross-section power limit.
2. require the recognition methods in described electric power system transient stability transmission cross-section power limit interval according to right 1, it is characterized in that, step 2) adopt formula (1), formula (2) to come the adjustable generator of rated output and deferrable load factor of influence in respectively to transient safe and stable transmission cross-section power limit
Wherein, m concentrates number of faults, p for transmission cross-section transient safe and stable examination fault
G.ijBe the transient state angle stability participation factors of generator i under the fault j, wherein, critical mass-sending motor participation factors is greater than 0, and remainder is mass-sended the motor participation factors less than 0, η
A.jBe transient state angle stability nargin under the fault j, s
G.iChange the sensitivity that causes that transmission cross-section active power changes for generator i active power; p
L.ijBe the transient voltage safe and stable participation factors of load i under the fault j, η
V.jBe transient voltage safe and stable nargin under the fault j, s
L.iFor load i active power changes the sensitivity that causes that transmission cross-section active power changes.
3. require the recognition methods in described electric power system transient stability transmission cross-section power limit interval according to right 1, it is characterized in that, the minimum value that step 4) is calculated the stable transmission cross-section power limit of considering transient security comprised for four steps:
The first step, determine to give, receiving end power is adjusted total amount: if first, then adopt the power of setting to adjust step-length, otherwise, power adjustment total amount is determined in the relation curve match that employing is adjusted total amount and transient safe and stable nargin based on power, if adjust step-length, then adopt the power of setting to adjust step-length greater than the power of setting;
Second step, determine to give, the power adjustment of receiving end generator and load: according to predefined sending end, receiving end generator and load adjustment order, for the adjustable generator of sending end, according to the factor of influence G of generator to transient safe and stable transmission cross-section power limit
i, increase factor of influence G from big to small successively
iBig generator power is for the deferrable load of sending end, according to the factor of influence L of load to transient safe and stable transmission cross-section power limit
i, reduce factor of influence L from small to large successively
iLittle load is adjusted total amount until the generator of sending end, the sending end power that the adjustment total amount of load equals to determine in the first step; For the adjustable generator of receiving end, according to the factor of influence G of generator to transient safe and stable transmission cross-section power limit
i, reduce factor of influence G from small to large successively
iLittle generator power is for the deferrable load of receiving end, according to the factor of influence L of load to transient safe and stable transmission cross-section power limit
i, increase factor of influence L from big to small successively
iBig load is adjusted total amount until the generator of receiving end, the receiving end power that the adjustment total amount of load equals to determine in the first step;
The 3rd step, transient safe and stable assessment: at sending of determining in going on foot by second, the power adjustment of receiving end generator and load generates new operational mode, adopt transient state angle stability quantitative estimation method and transient voltage safe and stable quantitative estimation method to concentrate remaining fault to carry out the transient safe and stable assessment respectively to transmission cross-section transient safe and stable examination fault, obtain the transient state angle stability pattern and the transient voltage safe and stable pattern of each fault, concentrate the transient safe and stable of some fault of existence not guarantee if the examination fault in limit search procedure, occurs, then filter out the examination fault and concentrate the fault can keep transient safe and stable, the unwarrantable fault of these transient safe and stables as remaining fault;
In the 4th step,, finish the calculation process of limit power minimum value if whether the error of section limit power then obtains the minimum value of limit power less than the threshold value of setting; Otherwise, according to the participation factors of generator, load, power the sensitivity of transmission cross-section power and transient state angle stability nargin, transient voltage safe and stable nargin are calculated every adjustable generator, each deferrable load factor of influence to the transmission cross-section power limit, return the first step.
4. require the recognition methods in described electric power system transient stability transmission cross-section power limit interval according to right 1, it is characterized in that, the maximum that step 5) is calculated the stable transmission cross-section power limit of considering transient security comprised for four steps:
The first step, determine to give, receiving end power is adjusted total amount: if first, then adopt the power of setting to adjust step-length, otherwise, power adjustment total amount is determined in the relation curve match that employing is adjusted total amount and transient safe and stable nargin based on power, if adjust step-length, then adopt the power of setting to adjust step-length greater than the power of setting;
Second step, determine to give, the power adjustment of receiving end generator and load: according to predefined sending end, receiving end generator and load adjustment order, for the adjustable generator of sending end, according to the factor of influence G of generator to transient safe and stable transmission cross-section power limit
i, increase factor of influence G from small to large successively
iLittle generator power is for the deferrable load of sending end, according to the factor of influence L of load to transient safe and stable transmission cross-section power limit
i, reduce factor of influence L from big to small successively
iBig load is adjusted total amount until the generator of sending end, the sending end power that the adjustment total amount of load equals to determine in the first step; For the adjustable generator of receiving end, according to the factor of influence G of generator to transient safe and stable transmission cross-section power limit
i, reduce factor of influence G from big to small successively
iBig generator power is for the deferrable load of receiving end, according to the factor of influence L of load to transient safe and stable transmission cross-section power limit
i, increase factor of influence L from small to large successively
iLittle load is adjusted total amount until the generator of receiving end, the receiving end power that the adjustment total amount of load equals to determine in the first step;
The 3rd step, transient safe and stable assessment: at sending of determining in going on foot by second, the power adjustment of receiving end generator and load generates new operational mode, adopt transient state angle stability quantitative estimation method and transient voltage safe and stable quantitative estimation method to concentrate remaining fault to carry out the transient safe and stable assessment respectively to transmission cross-section transient safe and stable examination fault, obtain the transient state angle stability pattern and the transient voltage safe and stable pattern of each fault, concentrate the transient safe and stable of some fault of existence not guarantee if the examination fault in limit search procedure, occurs, then filter out the examination fault and concentrate the fault can keep transient safe and stable, the unwarrantable fault of these transient safe and stables as remaining fault;
In the 4th step,, finish limit power Computation of Maximal Waiting flow process if whether the error of section limit power then obtains the maximum of limit power less than the threshold value of setting; Otherwise, according to the participation factors of generator, load, power the sensitivity of transmission cross-section power and transient state angle stability nargin, transient voltage safe and stable nargin are calculated every adjustable generator, each deferrable load factor of influence to the transmission cross-section power limit, return the first step.
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