CN107506945A - A kind of power system ultra-low frequency oscillation sensitivity unit screening technique - Google Patents
A kind of power system ultra-low frequency oscillation sensitivity unit screening technique Download PDFInfo
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- CN107506945A CN107506945A CN201710834035.9A CN201710834035A CN107506945A CN 107506945 A CN107506945 A CN 107506945A CN 201710834035 A CN201710834035 A CN 201710834035A CN 107506945 A CN107506945 A CN 107506945A
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Abstract
The invention discloses a kind of power system ultra-low frequency oscillation sensitivity unit screening technique, comprise the following steps：A, simulation model is built；B, various ways are carried out with small interference analysis using simulation model to each Hydropower Unit respectively to calculate, obtains the Oscillatory mode shape i that frequency is less than 0.1Hz, obtain the correlation factor p of each unit under the modeik, wherein, i represents that Oscillatory mode shape i, k represent kth platform generator；C, according to correlation factor pikCoefficient R of each Hydropower Unit under each mode is calculated respectivelyik；D, according to coefficient RikUltra-low frequency oscillation sensitivity unit is judged.This method is based on the correlation factor p under ultra-low frequency oscillation mode iikDraw the coefficient R of each Hydropower Unitik, can each Hydropower Unit of quantitative evaluation participate in ultra-low frequency oscillation degree, judge to identify ultra-low frequency oscillation sensitivity unit.
Description
Technical field
The present invention relates to Power System Analysis technical field, and in particular to a kind of power system ultra-low frequency oscillation sensitivity unit
Screening technique.
Background technology
Occur the oscillatory occurences less than 0.1Hz in high water power accounting power network successively, cause system frequency significantly long period
Change, because frequency is lower than low-frequency oscillation, referred to as ultra-low frequency oscillation, this type vibrate and Turbine Governor System primary frequency modulation
Performance and " water hammer effect " correlation of diversion system are strong, governing system periodicity frequent movement when ULF vibration occurs,
System frequency is widely varied, but excitation system and PSS are not responded significantly to this vibration, and its property is substantially different from often
Advise the low-frequency oscillation in meaning.
Study and shown with operating experience, generator speed regulating control strategy has a major impact to mains frequency characteristic.Mesh
Preceding governing system frequently with PID regulation strategy in, in order to meet the requirement of primary frequency modulation quick regulation, be usually arranged as larger
Parameter, but the too fast regulation of governing system may to power system formed effect of negative damping, in the high accounting power network of water power easily
Trigger ultra-low frequency oscillation.Especially for the power system for synchronously turning Asynchronous Interconnection, it is necessary to governing system control mode and ginseng
Number is transformed and optimized, and suppresses to balance in the target of two contradiction in primary frequency modulation performance and ultra-low frequency oscillation, it is difficult to take into account.
Because generating set is numerous in current complicated electric power system, it is impossible to which also unnecessary optimized to whole set speed adjustment systems changes
Make, how to screen ultra-low frequency oscillation sensitivity unit, turn into the huge difficult problem that power grid operation personnel face.
The content of the invention
In order to solve the above-mentioned technical problem the present invention provides a kind of power system ultra-low frequency oscillation sensitivity unit screening technique.
The present invention is achieved through the following technical solutions：
A kind of power system ultra-low frequency oscillation sensitivity unit screening technique, comprises the following steps：
A, simulation model is built；
B, using simulation model various ways are carried out with small interference analysis to calculate, obtains the oscillation mode that frequency is less than 0.1Hz
State i, obtain the correlation factor p of each unit under the modeik, wherein, i represents that Oscillatory mode shape i, k represent kth platform generator；
C, according to correlation factor pikCoefficient R of each Hydropower Unit under each mode is calculated respectivelyik；
D, according to coefficient RikUltra-low frequency oscillation sensitivity unit is judged.
Ultra-low frequency oscillation is different from low-frequency oscillation, Low Frequency Oscillation Analysis from mechanism caused by governing system negative damping
The indexs such as the participation factor of middle use, residual can not be directly used in guidance screening ultra-low frequency oscillation sensitivity unit, it is necessary to propose
New index and method.This programme is based on the correlation factor p under ultra-low frequency oscillation mode iikDraw the correlation of each Hydropower Unit
Coefficients Rik, can each Hydropower Unit of quantitative evaluation participate in ultra-low frequency oscillation degree, judge to identify ultra-low frequency oscillation sensitivity unit, be super
Low-frequency oscillation suppresses to provide aid decision.
Preferably, the various ways include rich big, Feng Ping, it is rich it is small, the Feng Ji little methods of operation at least two.
Preferably, the step C specific methods are：
C1, each generating set is calculated in reference capacity SBOn rotary inertia Jk,
Wherein, PkFor the rated power of kth platform generator, TjkFor the inertial time of kth platform generator
Between constant；
C2, the coefficient R for calculating each Hydropower Unit for participating in oscillation mode iik,
Rik=pik·Jk。
Preferably, the step D is specially：
D11, under each mode respectively to the coefficient R of each Hydropower UnitikSorted from big to small；
D12, according to sequence ultra-low frequency oscillation sensitivity unit is judged.
Further, the specific method of the step D12 is：Sort most preceding water power in step D11 ranking results
Unit is then ultra-low frequency oscillation sensitivity unit.
Further, step D12 specific method is：The forward Hydropower Unit that sorted under at least two modes is then
Ultra-low frequency oscillation sensitivity unit.
Preferably, the step D is specially：
D21, each Hydropower Unit coefficient R under various ways is calculated respectivelyikSummation；
D22, the coefficient R to each Hydropower Unit in step D21ikSummation is sorted from big to small；
The forward Hydropower Unit of D23, sequence is ultra-low frequency oscillation sensitivity unit.
Preferably, in the step A, when building simulation model, each generator considers governor model in model, adjusts
Fast device uses Model Measured, if speed regulator is not surveyed, applies mechanically same type, close with capacity and water hammer effect time constant
Machine unit speed regulating device parameter.
Preferably, in the step A, when building simulation model, according to the difference of wet season load level, allusion quotation is considered
Type rich big, Feng Ping, rich small, Feng Ji little the method for operation, start principle is run according to actual electric network and adjusts basic trend.
The present invention compared with prior art, has the following advantages and advantages：
1st, method of the invention is based on the correlation factor p under ultra-low frequency oscillation mode iikDraw the correlation of each Hydropower Unit
Coefficients Rik, can each Hydropower Unit of quantitative evaluation participate in ultra-low frequency oscillation degree, judge to identify ultra-low frequency oscillation sensitivity unit, for electricity
Participation percentage contribution of each generating set of net analysis personnel's quantitative evaluation to ultra-low frequency oscillation pattern provides technological means.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment, the present invention is made
Further to describe in detail, exemplary embodiment of the invention and its explanation are only used for explaining the present invention, are not intended as to this
The restriction of invention.
Embodiment 1
A kind of power system ultra-low frequency oscillation sensitivity unit screening technique, comprises the following steps：
A, simulation model is built；
B, various ways are carried out with small interference analysis using simulation model to each Hydropower Unit respectively to calculate, it is small obtains frequency
In 0.1Hz Oscillatory mode shape i, the correlation factor p of each unit under the mode is obtainedik, wherein, i represents that Oscillatory mode shape i, k represent the
K platform generators；
C, according to correlation factor pikCoefficient R of each Hydropower Unit under each mode is calculated respectivelyik；
D, according to coefficient RikUltra-low frequency oscillation sensitivity unit is judged.
Embodiment 2
Principle and thought based on above-described embodiment, the present embodiment disclose a specific implementation of step C in above-described embodiment
Method.
Step C specific methods are：
C1, each generating set is calculated in reference capacity SBOn rotary inertia Jk,
Wherein, PkFor the rated power of kth platform generator, TjkFor the inertia time of kth platform generator
Constant；
C2, the coefficient R for calculating each Hydropower Unit for participating in oscillation mode iik,
Rik=pik·Jk。
The coefficient R of each Hydropower Unit is determined using this methodik, it considers correlation factor and turbine generator inertia
Influence, can each unit of quantitative evaluation participate in ultra-low frequency oscillation degree, provide aid decision for ultra-low frequency oscillation suppression.
Embodiment 3
Based on above-mentioned two embodiment, the present embodiment discloses a specific method.
A, simulation model is built：When building, each generator considers governor model in model, and speed regulator is using actual measurement mould
Type, if speed regulator is not surveyed, apply mechanically same type, with the close machine unit speed regulating device ginseng of capacity and water hammer effect time constant
Number.When building simulation model, according to the difference of wet season load level, typical case rich big, Feng Ping, rich small, Feng Ji little etc. are considered
The method of operation, according to actual electric network run start principle adjust basic trend；
B, various ways are carried out with small interference analysis using simulation model to each Hydropower Unit respectively to calculate, obtains ultralow frequency
Oscillatory mode shape is the Oscillatory mode shape i that frequency is less than 0.1Hz, obtains the correlation factor p of each unit under the modeik, wherein, i is represented
Oscillatory mode shape i, k represent kth platform generator；
C, coefficient R of each Hydropower Unit under each mode is calculated in the way of embodiment 2ik, the coefficient RikGinseng
With the sensitivity quantizating index of ultra-low frequency oscillation unit；
D, according to coefficient RikUltra-low frequency oscillation sensitivity unit is judged.The step has a variety of implementations, this
Embodiment is carried out using sort method, can specifically be realized using following three kinds of modes.
One：
D11, under each mode respectively to the coefficient R of each Hydropower UnitikSorted from big to small；
D12, the most preceding Hydropower Unit that sorts in step D11 ranking results are then ultra-low frequency oscillation sensitivity unit.
Secondly：
D11, under each mode respectively to the coefficient R of each Hydropower UnitikSorted from big to small；
D12, the forward Hydropower Unit that sorts under at least two modes are then ultra-low frequency oscillation sensitivity unit.
The coefficient R that this determination methods obtains each modeikSorted from big to small, due to fired power generating unit speed regulator
In the commonly provided positive damping of ultralow frequency range, fired power generating unit can not be temporarily considered when carrying out the screening of ultra-low frequency oscillation sensitivity unit,
Therefore it is then ultra-low frequency oscillation sensitivity unit to have the Hydropower Unit of larger coefficient correlation under multiple modes.Using the manner to super
Low-frequency oscillation sensitivity unit is judged that its degree of accuracy differentiated is more than first way above.
Thirdly：
D21, each Hydropower Unit coefficient R under various ways is calculated respectivelyikSummation；
D22, the coefficient R to each Hydropower Unit in step D21ikSummation is sorted from big to small；
The forward Hydropower Unit of D23, sequence is ultra-low frequency oscillation sensitivity unit.
In ultra-low frequency oscillation sensitivity unit deterministic process is carried out, any of above-mentioned three kinds of modes can be used, are utilized
Coefficient RikTo judge ultra-low frequency oscillation sensitivity unit, quantizating index is provided for the screening of ultra-low frequency oscillation sensitivity unit, is
Participation percentage contribution of each generating set of electrical network analysis personnel's quantitative evaluation to ultra-low frequency oscillation pattern provides technological means.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (9)
1. a kind of power system ultra-low frequency oscillation sensitivity unit screening technique, it is characterised in that comprise the following steps：
A, simulation model is built；
B, using simulation model various ways are carried out with small interference analysis to calculate, obtain the Oscillatory mode shape i that frequency is less than 0.1Hz,
Obtain the correlation factor p of each unit under the modeik, wherein, i represents that Oscillatory mode shape i, k represent kth platform generator；
C, according to correlation factor pikCoefficient R of each Hydropower Unit under each mode is calculated respectivelyik；
D, according to coefficient RikUltra-low frequency oscillation sensitivity unit is judged.
A kind of 2. power system ultra-low frequency oscillation sensitivity unit screening technique according to claim 1, it is characterised in that institute
State various ways include rich big, Feng Ping, it is rich it is small, the Feng Ji little methods of operation at least two.
A kind of 3. power system ultra-low frequency oscillation sensitivity unit screening technique according to claim 1, it is characterised in that institute
Stating step C specific methods is：
C1, each generating set is calculated in reference capacity SBOn rotary inertia Jk,
Wherein, PkFor the rated power of kth platform generator, TjkInertia time for kth platform generator is normal
Number；
C2, the coefficient R for calculating each Hydropower Unit for participating in oscillation mode iik,
Rik=pik·Jk。
A kind of 4. power system ultra-low frequency oscillation sensitivity unit screening technique according to claim 1, it is characterised in that institute
Stating step D is specially：
D11, under each mode respectively to the coefficient R of each Hydropower UnitikSorted from big to small；
D12, according to sequence ultra-low frequency oscillation sensitivity unit is judged.
A kind of 5. power system ultra-low frequency oscillation sensitivity unit screening technique according to claim 4, it is characterised in that institute
The specific method for stating step D12 is：The most preceding Hydropower Unit that sorted in step D11 ranking results is then quick for ultra-low frequency oscillation
Feel unit.
A kind of 6. power system ultra-low frequency oscillation sensitivity unit screening technique according to claim 4, it is characterised in that step
Suddenly D12 specific method is：The forward Hydropower Unit that sorted under at least two modes is then ultra-low frequency oscillation sensitivity unit.
A kind of 7. power system ultra-low frequency oscillation sensitivity unit screening technique according to claim 1, it is characterised in that institute
Stating step D is specially：
D21, each Hydropower Unit coefficient R under various ways is calculated respectivelyikSummation；
D22, the coefficient R to each Hydropower Unit in step D21ikSummation is sorted from big to small；
The forward Hydropower Unit of D23, sequence is ultra-low frequency oscillation sensitivity unit.
A kind of 8. power system ultra-low frequency oscillation sensitivity unit screening technique according to claim 1, it is characterised in that institute
State in step A, when building simulation model, each generator considers governor model in model, and speed regulator uses Model Measured, if
Speed regulator is not surveyed, then applies mechanically same type, with the close machine unit speed regulating device parameter of capacity and water hammer effect time constant.
A kind of 9. power system ultra-low frequency oscillation sensitivity unit screening technique according to claim 1, it is characterised in that institute
State in step A, when building simulation model, according to the difference of wet season load level, consider the rich big, Feng Ping of typical case, rich small, rich
The minimum method of operation, start principle is run according to actual electric network and adjusts basic trend.
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| CN110323759A (en) * | 2019-02-27 | 2019-10-11 | 华北电力大学 | A kind of ultra-low frequency oscillation Key generating unit and its equipment localization method |
| CN110966136A (en) * | 2019-11-12 | 2020-04-07 | 广西大学 | Ultralow frequency oscillation control method of hydroelectric generating set |
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| CN110323759A (en) * | 2019-02-27 | 2019-10-11 | 华北电力大学 | A kind of ultra-low frequency oscillation Key generating unit and its equipment localization method |
| CN110966136A (en) * | 2019-11-12 | 2020-04-07 | 广西大学 | Ultralow frequency oscillation control method of hydroelectric generating set |
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