CN101572410B - Method for identifying element participation factors in transient safe and stable mode of power system - Google Patents
Method for identifying element participation factors in transient safe and stable mode of power system Download PDFInfo
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Abstract
The invention discloses a method for identifying element participation factors in a transient safe and stable mode of a power system, which identifies participation factors of generators and buses in a transient safe and stable mode and provides more detailed quantitative analysis and decision support for power system operation mode adjustment, electricity transmission limit calculation, control decision optimization and the like. The method comprises the following steps: according to transient power angle stable quantitative information given by an expanded equal-area criterion, identifying the participation factors of the generators in a transient power angle stable mode on the basis of the proportional relation between the acceleration kinetic energy or the deceleration kinetic energy of each generator; according to transient voltage safe and stable quantitative information given by a transient voltage safe and stable quantitative analysis method, identifying the participation factors of the buses on the basis of a proportional relation between bus voltage safe and stable margins; and according to transient frequency safe quantitative information given by a transient frequency safe quantitative analysis method, identifying the participation factors of the buses or the generators on the basis of a proportional relation between frequency safe margins of each bus or generator.
Description
Technical field
The invention belongs to the Power System and its Automation technical field, the present invention proposes more precisely,, discern the method for its participation factors at generator in the transient safe and stable mode and bus based on transient safe and stable quantitative analysis theory and method.
Background technology
Stable transient state angle stability, transient voltage safe and stable and transient frequency safety and stability three aspects of comprising of Transient Security for Power Systems, wherein transient voltage safe and stable comprises that transient voltage falls fail safe and considers the stable transient voltage stability of induction motor load, and the transient frequency fail safe is meant transient frequency skew fail safe.Adopt the theoretical and method of the quantitative analysis set up and to have proposed to obtain the safety and stability nargin and the pattern of electrical network under the forecast failure, wherein transient state angle stability pattern is that generator hives off and puts time, the transient voltage safe and stable pattern is the bus collection, and the transient frequency safe mode is bus and generator collection.Can be power system operation mode adjustment, the calculating of the transmission of electricity limit and control decision optimization etc. according to these quantitative informations guidance is provided, if can further provide the participation factors of element in the safe and stable mode, quantitative analysis efficiently and decision support then can be provided more specifically.
Summary of the invention
The objective of the invention is: the participation factors that provides element in the transient safe and stable mode, each element can be power system operation mode adjustment, the calculating of the transmission of electricity limit and control decision optimization etc. quantitative analysis efficiently and decision support is provided more specifically the influence degree of safety and stability in the quantification safe and stable mode.
The present invention is based on transient safe and stable quantitative analysis theory and method,, proposed to discern the method for its participation factors at generator in the safe and stable mode and bus.Specifically, the present invention takes following technical scheme to realize, comprises the following steps:
1) time-domain-simulation of forecast failure calculates: according to power system operation mode and corresponding model and parameter, at forecast failure, adopt the time-domain-simulation method to carry out the calculating of the power system operation track under the forecast failure;
2) transient safe and stable quantitative evaluation: be based upon on the basis that the time-domain-simulation of forecast failure calculates, adopt EEAC to analyze and obtain transient state angle stability quantitative information, comprise that hive off (a critical group of planes and remaining group), nargin and pendulum of generator is inferior; Adopt the transient voltage safe and stable quantitative analysis to obtain the transient voltage safe and stable quantitative information, comprise that transient voltage safe and stable monitors bus and nargin thereof; Adopt the transient frequency security quantification to analyze and obtain transient frequency security quantification information, comprise transient frequency security monitoring bus, generator and nargin thereof;
3) element participation factors identification:
For the identification of transient voltage safe and stable pattern median generatrix participation factors, from monitor bus, find the minimum value η of bus transient voltage safe and stable nargin
V.min(transient voltage safe and stable nargin scope is [100, + 100], nargin is greater than 0, and the expression transient voltage is a safety and stability, and nargin is less than 0, the expression transient voltage is dangerous stable, nargin equals 0, and the expression transient voltage is that criticality safety is stable, and margin value is big more, the safety and stability degree is high more), with (100-η
V.min) be benchmark, the transient voltage safe and stable nargin of bus i is designated as η
V.i, then with (100-η
V.i)/(100-η
V.min) as the participation factors of bus i;
For the identification of transient frequency safe mode median generatrix and generator participation factors, from monitor bus and generator, find the minimum value η of bus and generator transient frequency margin of safety
F.min(transient frequency margin of safety scope is [100 ,+100], and nargin is greater than 0, and the expression transient frequency is safe, nargin is less than 0, and the expression transient frequency is unsafe, and nargin equals 0, and the expression transient frequency is a criticality safety, margin value is big more, and safe coefficient is high more), with (100-η
F.min) be benchmark, the transient frequency margin of safety of bus or generator i is designated as η
F.i, then with (100-η
F.i)/(100-η
F.min) as the participation factors of bus or generator i.
Beneficial effect of the present invention is as follows: the present invention is based on transient safe and stable quantitative analysis theory and method, at safe and stable mode, provided the hive off participation factors of each generator in the pattern of transient state angle stability generator respectively, the participation factors of each bus in the transient voltage safe and stable pattern, the recognition methods of the participation factors of each bus and Ge Tai generator in the transient frequency safe mode, make and the refinement more of transient safe and stable quantitative information can be the power system operation mode adjustment according to these quantitative informations, calculating of the transmission of electricity limit and control decision optimization etc. provide more specifically quantitative analysis decision support efficiently.
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.
What step 1 was described among Fig. 1 is the time-domain-simulation calculating of forecast failure, promptly according to power system operation mode and corresponding model and parameter, at forecast failure, adopts the time-domain-simulation method to carry out the calculating of the power system operation track under the forecast failure;
The transient safe and stable quantitative evaluation that is based on the calculating of forecast failure time-domain-simulation that step 2 is described among Fig. 1, but the module that comprises 3 paired runnings, carry out the quantitative evaluation of transient state merit angle, voltage and frequency safety and stability respectively, promptly adopt EEAC to analyze and obtain transient state angle stability quantitative information, comprise that hive off (a critical group of planes and remaining group), nargin and pendulum of generator is inferior; Adopt the transient voltage safe and stable quantitative analysis to obtain the transient voltage safe and stable quantitative information, comprise that transient voltage safe and stable monitors bus and nargin thereof; Adopt the transient frequency security quantification to analyze and obtain transient frequency security quantification information, comprise transient frequency security monitoring bus, generator and nargin thereof;
What step 3 was described among Fig. 1 is element participation factors identification in the transient safe and stable mode, but comprises 3 paired running modules, is respectively applied for the participation factors of element in identification transient state merit angle, voltage and the frequency safe and stable mode;
For the hive off identification of generator participation factors in the pattern of transient state angle stability generator, if transient state angle stability nargin is less than 0, for critical mass-sending motor, the acceleration kinetic energy of each generator among the critical group when calculating disturbed track through dynamic saddle point (DSP), the maximum of quickening kinetic energy with generator among the critical group is as benchmark, the participation factors of the ratio of the acceleration kinetic energy of each generator in critical group and this fiducial value as each generator; For remainder mass-sending motor, the deceleration kinetic energy of each generator among the remaining group when calculating disturbed track through DSP, the same maximum of quickening kinetic energy with generator among the critical group is as benchmark, the participation factors of the opposite number of the ratio of the deceleration kinetic energy of each generator among the remaining group and this fiducial value as each generator; If transient state angle stability nargin is more than or equal to 0, for critical mass-sending motor, the acceleration kinetic energy that at first will determine the equivalent generator of critical group in the pendulum that disturbed track provides time in stable mode reaches the peaked moment, the maximum of quickening kinetic energy with generator among this constantly critical group is as benchmark, each generator among the critical group should the moment acceleration kinetic energy and the ratio of this fiducial value as the participation factors of each generator; For remainder mass-sending motor, the maximum of quickening kinetic energy with generator among this constantly critical group is as benchmark equally, each generator among the remaining group should the moment deceleration kinetic energy and the opposite number of the ratio of this fiducial value as the participation factors of each generator;
For the identification of transient voltage safe and stable pattern median generatrix participation factors, from monitor bus, find the minimum value η of bus transient voltage safe and stable nargin
V.min(transient voltage safe and stable nargin scope is [100, + 100], nargin is greater than 0, and the expression transient voltage is a safety and stability, and nargin is less than 0, the expression transient voltage is dangerous stable, nargin equals 0, and the expression transient voltage is that criticality safety is stable, and margin value is big more, the safety and stability degree is high more), with (100-η
V.min) be benchmark, the transient voltage safe and stable nargin of bus i is designated as η
V.i, then with (100-η
V.i)/(100-η
V.min) as the participation factors of bus i;
For the identification of transient frequency safe mode median generatrix and generator participation factors, from monitor bus and generator, find the minimum value η of bus and generator transient frequency margin of safety
F.min(transient frequency margin of safety scope is [100 ,+100], and nargin is greater than 0, and the expression transient frequency is safe, nargin is less than 0, and the expression transient frequency is unsafe, and nargin equals 0, and the expression transient frequency is a criticality safety, margin value is big more, and safe coefficient is high more), with (100-η
F.min) be benchmark, the transient frequency margin of safety of bus or generator i is designated as η
F.i, then with (100-η
F.i)/(100-η
F.min) as the participation factors of bus or generator i.
In a word, method for identifying element participation factors is based on Transient Security for Power Systems stable quantity fractional analysis theory and method in the transient safe and stable mode of power system, respectively to the generator participation factors of critical group in the transient state angle stability pattern with remaining group, transient voltage safe and stable pattern median generatrix participation factors, and transient frequency safe mode median generatrix and generator participation factors are discerned, make and the refinement more of transient safe and stable quantitative information can be the power system operation mode adjustment according to these quantitative informations, calculating of the transmission of electricity limit and control decision optimization etc. provide more specifically quantitative analysis decision support efficiently.
Claims (4)
1. method for identifying element participation factors in the transient safe and stable mode of power system is characterized in that:
1) the transient state angle stability quantitative information that provides according to expansion homalographic criterion (EEAC), wherein transient state angle stability quantitative information comprise that generator hives off, stability margin and pendulum, based on the acceleration kinetic energy of every generator or the proportionate relationship between the deceleration kinetic energy, the participation factors of generator in the identification transient state angle stability critical conduction mode;
2) the transient voltage safe and stable quantitative information that provides according to transient voltage safe and stable quantitative analysis method, wherein the transient voltage safe and stable quantitative information comprises bus and stability margin thereof, based on the proportionate relationship between each bus transient voltage safe and stable nargin, the participation factors of identification bus;
3) the transient frequency security quantification information that provides according to transient frequency security quantification analytical method, wherein transient frequency security quantification information comprises bus, generator and stability margin thereof, based on the proportionate relationship between each bus or the generator transient frequency safety and stability nargin, the participation factors of identification bus or generator.
2. method for identifying element participation factors in the transient safe and stable mode of power system according to claim 1 is characterized in that, content 1) in the transient state angle stability critical conduction mode described the participation factors identification of generator be divided into two steps:
1) carry out time-domain-simulation at forecast failure and calculate, obtain transient state angle stability quantitative information through expansion homalographic criterion (EEAC) analysis, comprise that generator hives off, stability margin and pendulum time information, wherein, generator hives off and comprises a critical group of planes and remaining group;
2) if stability margin less than 0, for critical group of planes generator, the acceleration kinetic energy of each generator in the critical group of planes when calculating disturbed track through dynamic saddle point (DSP), quicken the maximum of kinetic energy as benchmark, the participation factors of the ratio of the acceleration kinetic energy of each generator in the critical group of planes and this fiducial value with generator in the critical group of planes as each generator; For remainder mass-sending motor, the deceleration kinetic energy of each generator among the remaining group when calculating disturbed track through dynamic saddle point (DSP), with the maximum of generator deceleration kinetic energy among the remaining group as benchmark, the participation factors of the ratio of the deceleration kinetic energy of each generator in remaining group and this fiducial value as each generator; If stability margin is more than or equal to 0, for critical group of planes generator, the acceleration kinetic energy that at first will determine critical group of planes generator in the pendulum that disturbed track provides time in transient safe and stable mode reaches the peaked moment, with this maximum that constantly generator quickens kinetic energy in critical group of planes as benchmark, each generator in the critical group of planes should the moment acceleration kinetic energy and the ratio of this fiducial value as the participation factors of each generator; For remainder mass-sending motor, with the maximum of generator deceleration kinetic energy among the remaining group of identical moment as benchmark, each generator among the remaining group is somebody's turn to do the participation factors of the ratio of deceleration kinetic energy constantly and this fiducial value as each generator, and wherein said pendulum is claim 1 content 1) described pendulum.
3. method for identifying element participation factors in the transient safe and stable mode of power system according to claim 1 is characterized in that, content 2) in the participation factors identification of the bus described be divided into two steps:
1) carries out time-domain-simulation at forecast failure and calculate, obtain the quantitative information of transient voltage safe and stable, comprise bus and bus transient voltage safe and stable nargin information thereof through the transient voltage safe and stable quantitative analysis;
2) from monitor bus, find the minimum value η of bus transient voltage safe and stable nargin
V.min, with (100-η
V.min) be benchmark, the bus transient voltage safe and stable nargin of bus i is designated as η
V.i, then with (100-η
V.i)/(100-η
V.min) as the participation factors of bus i, wherein, transient voltage safe and stable nargin scope is [100 ,+100], bus transient voltage safe and stable nargin is greater than 0, the expression transient voltage is a safety and stability, and bus transient voltage safe and stable nargin is less than 0, and the expression transient voltage is dangerous stable, bus transient voltage safe and stable nargin equals 0, the expression transient voltage is that criticality safety is stable, and bus transient voltage safe and stable margin value is big more, and the safety and stability degree is high more.
4. method for identifying element participation factors in the transient safe and stable mode of power system according to claim 1 is characterized in that, content 3) in the bus described and the participation factors identification of generator be divided into two steps:
1) carries out time-domain-simulation at forecast failure and calculate, analyze the quantitative information that obtains transient frequency safety, comprise bus, generator and transient frequency margin of safety information thereof through the transient frequency security quantification;
2) from monitor bus, generator, find the minimum value η of bus and generator transient frequency margin of safety
F.min, with (100-η
F.min) be benchmark, the transient frequency margin of safety of bus or generator i is designated as η
F.i, then with (100-η
F.i)/(100-η
F.min) as the participation factors of bus or generator i, wherein, transient frequency margin of safety scope is [100 ,+100], the transient frequency margin of safety is greater than 0, the expression transient frequency is safe, and the transient frequency margin of safety is less than 0, and the expression transient frequency is unsafe, the transient frequency margin of safety equals 0, the expression transient frequency is a criticality safety, and transient frequency margin of safety value is big more, and safe coefficient is high more.
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| CN101789607B (en) * | 2010-03-16 | 2012-11-28 | 国网电力科学研究院 | Computing method for improving small signal stability and providing aid decision making |
| CN101841155B (en) * | 2010-06-08 | 2012-11-14 | 国网电力科学研究院 | Typical fault set identification method for transient stability analysis of power system |
| CN102064548B (en) * | 2010-12-17 | 2014-03-12 | 中国电力科学研究院 | Transient frequency deviation considered method for optimizing rotation reserve of once frequency modulation |
| CN102510072B (en) * | 2011-11-15 | 2013-09-25 | 河海大学 | Power grid system transient destabilization differentiation method |
| CN103401232B (en) * | 2013-04-24 | 2015-09-16 | 南京南瑞集团公司 | Transient Security for Power Systems stablizes the PC cluster method of online emergency control policy |
| CN103515951B (en) * | 2013-08-12 | 2015-07-08 | 南京南瑞集团公司 | Calculation method for transient state power angle stability control sensitive factors of direct current emergent power modulation and load shedding of power system |
| CN103683267B (en) * | 2013-10-29 | 2015-11-04 | 国家电网公司 | Different DC line power support capacity distribution method in a kind of many direct current systems |
| CN103762579B (en) * | 2013-12-22 | 2015-11-11 | 国家电网公司 | A kind of direct-current power emergency control performance index calculation method improving transient power angle stability of power grid |
| CN105406460B (en) * | 2015-09-21 | 2018-05-15 | 国家电网公司 | Unit based on wide area measurement information is encouraged by force supports control method for coordinating with direct-current emergency power |
| CN105938174B (en) * | 2016-05-13 | 2018-11-30 | 云南电力调度控制中心 | The transmission line malfunction position method for quickly identifying of transient rotor angle stability most serious |
| CN113341210B (en) * | 2021-05-20 | 2024-02-23 | 南瑞集团有限公司 | Bus transient voltage stability evaluation method, system, medium and computing equipment |
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