CN109636247A - A kind of fired power generating unit primary frequency modulation performance performance assessment criteria calculation method and its system - Google Patents
A kind of fired power generating unit primary frequency modulation performance performance assessment criteria calculation method and its system Download PDFInfo
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- CN109636247A CN109636247A CN201910030222.0A CN201910030222A CN109636247A CN 109636247 A CN109636247 A CN 109636247A CN 201910030222 A CN201910030222 A CN 201910030222A CN 109636247 A CN109636247 A CN 109636247A
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a kind of fired power generating unit primary frequency modulation performance performance assessment criteria calculation method and its systems, comprising the following steps: the additional weight coefficient of device electricity is calculated according to the related electric amount information of system；According to the additional weight coefficient, the practical device electricity for increasing power output of primary frequency modulation and primary frequency modulation theory that calculate primary frequency modulation unit increase the device electricity of power output；The primary frequency modulation performance performance assessment criteria value of unit is calculated based on the device electricity that the practical device electricity for increasing power output of the primary frequency modulation and primary frequency modulation theory increase power output.The present invention not only realizes system fired power generating unit primary frequency modulation performance after power disturbance fault disturbance and examines, but also grid-connected power plant can be motivated to improve unit Primary frequency control ability, inhibits the quick variation of frequency and supports the fast quick-recovery of frequency.
Description
Technical field
The present invention relates to a kind of based on the fired power generating unit primary frequency modulation performance performance assessment criteria calculating for improving device electricity algorithm
Method and its system, belong to power system and automation technology.
Background technique
With national economic fast development, each department active power workload demand constantly increases, and guarantees the supply and demand of electric energy
Balance is the essential condition of frequency stabilization.Meanwhile with the continuous development of the trans-regional interconnected network in China, large capacity remote conveying
Electricity becomes an important feature of China's power grid.With being continuously increased for single back transmission line transmission line capability, system causes
The fluctuate widely risk of accident of frequency continues to increase, so that operation of power networks scheduling focuses more on the performance of unit primary frequency modulation.
When emergent power vacancy in electric system, the frequency of electric system is lower than rated value, has the unit benefit of primary frequency function
With the accumulation of heat in boiler, is contributed according to the spontaneous quick adjustment of the frequency variation of system, improve the frequency stability of system.
Under power disturbance failure, when the smaller not up to clipping of governor of system frequency deviation, the pitch of governor
Signal is the linearity curve changed about frequency, and amplitude is codetermined by the frequency departure and difference coefficient of system；Work as system
When frequency departure reaches the clipping of governor, pitch instruction is fixed value, does not change with frequency and changes.Under pitch signal,
Fired power generating unit governor adjusts the practical power output of fired power generating unit by changing the size of porthole aperture, still, due to steam turbine
Release accumulation of heat needs certain delay, the variation that the practical power output of unit cannot not follow pitch to instruct at once, so as to cause mesh
The unit primary frequency modulation theoretical capacity that the calculation method of the device electricity of preceding use obtains is much larger than the actual act electricity of unit,
The result obtained using the ratio of the two as primary frequency modulation effectiveness indicator is generally smaller, the index reference value as Performance Assessment
Less.
And what the device electricity that generallys use of Utilities Electric Co. more stressed at present is during frequency disturbance failure, from primary
The angle of frequency modulation assisted hatching is set out, embodiment be unit increment life insurance in whole process value.
Summary of the invention
For the deficiency of existing primary frequency modulation wire examination method, fully considers and fall to go out with initial stages of restoration unit in system frequency
The significant contribution of power, the present invention provide a kind of based on the fired power generating unit primary frequency modulation performance performance assessment criteria for improving device electricity algorithm
Calculation method and its system not only realize system fired power generating unit primary frequency modulation performance after power disturbance fault disturbance and examine,
And it can be improved unit Primary frequency control ability, inhibit the quick variation of frequency and support the fast quick-recovery of frequency.
The technical solution adopted by the invention is as follows:
A kind of fired power generating unit primary frequency modulation performance performance assessment criteria calculation method of the invention, comprising the following steps:
A kind of fired power generating unit primary frequency modulation performance performance assessment criteria calculation method, comprising the following steps: according to the correlation of system
The additional weight coefficient of electric quantity information calculating device electricity；According to the additional weight coefficient, primary frequency modulation unit is calculated
The practical device electricity for increasing power output of primary frequency modulation and primary frequency modulation theory increase the device electricity of power output；Based on the primary tune
The device electricity that the practical device electricity for increasing power output of frequency and primary frequency modulation theory increase power output calculates the primary frequency modulation of unit
It can performance assessment criteria value.
Further, before the additional weight coefficient that device electricity is calculated according to the related electric amount information of system,
It further include obtaining relevant calculation parameter, it is determined whether primary frequency modulation performance examination, specific side are carried out to grid-connected fired power generating unit
Method is as follows:
Using the primary frequency modulation on-line monitoring system of WAMS system (wide-area monitoring systems), system frequency in perturbation process is obtained
Rate f (t) and unit active power output P (t)；
When mains frequency exceeds 50 ± Δ fsqAnd duration when being more than 20 seconds, then examination thermoelectricity in the secondary perturbation process
The primary frequency modulation performance of unit, wherein Δ fsqFor the controlling dead error of unit frequency；Mains frequency exceeds 50 ± Δ f for the first timesq's
Moment is denoted as 0, returns to 50 ± Δ f for the first timesqWithin at the time of be denoted as tzIf tz>=60 seconds, then tzConsidered by 60 seconds；Examination is disturbed
Dynamic process time range is 0-tz；
According to the grid-connected requirement of generating set, the maximum Load adjustment clipping for obtaining the primary frequency modulation of fired power generating unit is Δ Pmax
It is P with rated powerN, the difference coefficient of governor is δ.
The calculation method of the additional weight coefficient of the device electricity is as follows；
Derivation carried out to f (t) obtain the expression formula of frequency change rate be
The change rate f'(t of system frequency f (t) and frequency) is normalized, during obtaining primary frequency modulation
Contributory index coefficient is respectively f*(t) and f'*(t)；Wherein, Δ t is the time interval of sampling.
And then it obtains comprehensive additional weight coefficient and is
K (t)=f*(t)+f'*(t) (1)。
The change rate f'(t of system frequency f (t) and frequency) is normalized, during obtaining primary frequency modulation
Contributory index coefficient is respectively f*(t) and f'*(t), the specific method is as follows:
In formula: f (t)maxAnd f'(t)maxIt is system frequency and the value of frequency change rate in time 0-tzBetween maximum value,
f(t)minAnd f'(t)minIt is system frequency and the value of frequency change rate in time 0-tzBetween minimum value, the range of t is 0-tz。
The practical device electricity for increasing power output of primary frequency modulation after primary frequency modulation unit additional weight is
The primary frequency modulation theory increases the device electricity contributed
As [f (t)-fN]×PN/fN/δ≥ΔPmaxWhen, then DPj(t)=Δ Pmax；
As [f (t)-fN]×PN/fN/δ<ΔPmaxWhen, then Δ Pj(t)=[f (t)-fN]×PN/fN/δ；
As k (t) >=1, η=k (t) is enabled；
As k (t) < 1, η=1 is enabled；
In formula, P (0) is practical power output of the unit at 0 moment；fNFor the rated frequency of system.
The calculation method of the primary frequency modulation performance performance assessment criteria value of the unit is as follows:
The embodiment of the present invention also provides a kind of fired power generating unit primary frequency modulation performance performance assessment criteria computing system, and system includes net
Network interface, memory and processor；Wherein,
Network interface, during for being received and sent messages between other ext nal network elements, signal is sended and received；
Memory, for storing the computer program instructions that can be run on the processor；
Processor, for executing above-mentioned fired power generating unit primary frequency modulation performance and examining when running the computer program instructions
The step of core index calculating method.
Beneficial effects of the present invention are as follows:
The method of the present invention is the deficiency for currently used fired power generating unit primary frequency modulation performance performance assessment criteria, proposes root
The device electricity algorithm and primary frequency modulation performance performance assessment criteria algorithm of different weights are added according to unit primary frequency modulation percentage contribution,
Help to improve the enthusiasm that grid-connected unit participates in primary frequency modulation ancillary service function, the primary frequency modulation performance of specification unit.This
Invention considers using frequency offset and frequency change rate as coefficient of colligation index, when the comprehensive contribution coefficient of frequency response is greater than
The product for the difference that when 1, the practical power output of unit is contributed with the result of product of the coefficient as unit contribution, and by it and is initially contributed
Divide standard of the ratio of electricity and practical theoretical device electricity as examination, by the basis of unit practical power output knots modification
It is superimposed certain compensation electricity, encourages the adjustment power output of unit faster and more, inhibits the quick variation of frequency and supports frequency
Fast quick-recovery.
Detailed description of the invention
Fig. 1 is the work flow diagram of the method for the present invention.
Fig. 2 is normalized curve；
Fig. 3 is comprehensive additional weight coefficient figure.
Specific embodiment
The invention will be further described below.Following embodiment is only used for clearly illustrating technical side of the invention
Case, and not intended to limit the protection scope of the present invention.
The basic principle of the method for the present invention is: in the case where system active power disturbs failure, for the primary tune of fired power generating unit
Frequently increased power output, at the time of the rate of change of frequency is faster, frequency departure is bigger, the contribution of unit increment life insurance is got over
Greatly.Accordingly, it is considered to using frequency offset and frequency change rate as comprehensive additional weight coefficient index, first by frequency shift (FS)
The processing that amount and the value of frequency change rate are normalized, when the comprehensive contribution coefficient of frequency response is greater than 1, by unit reality
Power output and the result of product of the coefficient are contributed as unit contribution, and the device electricity of the difference of itself and initial power output and reality are managed
Standard by the ratio of device electricity as examination.Its specific implementation step is as shown in Figure 1.
1) the primary frequency modulation on-line monitoring system for utilizing WAMS system (wide-area monitoring systems), obtains system in perturbation process
Frequency f (t) and unit active power output P (t).When mains frequency exceeds 50 ± Δ fsqAnd duration when being more than 20 seconds, then it examines
The primary frequency modulation contribution of fired power generating unit in the secondary perturbation process, wherein Δ fsqFor the controlling dead error of unit frequency.Mains frequency
Exceed 50 ± Δ f for the first timesqAt the time of be denoted as 0, for the first time return 50 ± Δ fsqWithin at the time of be denoted as tzIf tz>=60 seconds, then tz
Considered according to 60 seconds.The perturbation process time range of examination is 0-tz。
In addition, according to the grid-connected requirement of generating set, the maximum Load adjustment clipping for obtaining the primary frequency modulation of fired power generating unit is
ΔPmaxIt is P with rated powerN, the difference coefficient of governor is δ.
2) the additional weight coefficient of device electricity is calculated.
Derivation carried out to f (t) obtain the expression formula of frequency change rate be
Wherein, Δ t is the time interval of sampling.
The change rate f'(t of system frequency f (t) and frequency) is normalized
In formula: f (t)maxAnd f'(t)maxIt is system frequency and the value of frequency change rate in time 0-tzBetween maximum value,
f(t)minAnd f'(t)minIt is system frequency and the value of frequency change rate in time 0-tzBetween minimum value, the range of t is 0-
tz.Normalized curve is as shown in Figure 2.
And then it obtains comprehensive additional weight coefficient (as shown in Figure 3) and is
K (t)=f*(t)+f'*(t) (1)
3) device electricity for calculating the considerations of practical additional issue of primary frequency modulation unit is contributed additional weight and reason in the corresponding time
By calculating device electricity.
The primary frequency modulation of additional weight it is practical increase power output device electricity be
Primary frequency modulation theory increases the device electricity contributed
As [f (t)-fN]×PN/fN/δ≥ΔPmaxWhen, then Δ Pj(t)=Δ Pmax；
As [f (t)-fN]×PN/fN/δ<ΔPmaxWhen, then Δ Pj(t)=[f (t)-fN]×PN/fN/δ。
As k (t) >=1, η=k (t) is enabled；
As k (t) < 1, η=1 is enabled.
In formula, P (0) is practical power output of the unit at 0 moment；fNFor the rated frequency of system.
4) the primary frequency modulation performance performance assessment criteria of unit is calculated.
A kind of fired power generating unit primary frequency modulation performance performance assessment criteria computing system, system include network interface, memory and place
Manage device；Wherein,
Network interface, during for being received and sent messages between other ext nal network elements, signal is sended and received；
Memory, for storing the computer program instructions that can be run on the processor；
Processor refers to for when running computer program instructions, executing above-mentioned fired power generating unit primary frequency modulation performance examination
The step of marking calculation method.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (10)
1. a kind of fired power generating unit primary frequency modulation performance performance assessment criteria calculation method, which comprises the following steps:
The additional weight coefficient of device electricity is calculated according to the related electric amount information of system；
According to the additional weight coefficient, the practical device electricity and one for increasing power output of primary frequency modulation of primary frequency modulation unit is calculated
Secondary frequency modulation theory increases the device electricity of power output；
Increase the device electricity meter of power output based on the practical device electricity for increasing power output of the primary frequency modulation and primary frequency modulation theory
Calculate the primary frequency modulation performance performance assessment criteria value of unit.
2. fired power generating unit primary frequency modulation performance performance assessment criteria calculation method according to claim 1, which is characterized in that described
It further include obtaining relevant calculation ginseng before the additional weight coefficient for calculating device electricity according to the related electric amount information of system
Number, it is determined whether primary frequency modulation performance examination is carried out to grid-connected fired power generating unit, the specific method is as follows:
Using the primary frequency modulation on-line monitoring system of wide-area monitoring systems, obtaining system frequency f (t) and unit in perturbation process has
Function contributes P (t)；
When mains frequency exceeds 50 ± Δ fsqAnd the duration when being more than based on the presetting duration, then examination is disturbed at this
The primary frequency modulation performance of fired power generating unit during dynamic, wherein Δ fsqFor the controlling dead error of unit frequency；Mains frequency exceeds for the first time
50±ΔfsqAt the time of be denoted as 0, for the first time return 50 ± Δ fsqWithin at the time of be denoted as tzIf tz>=60 seconds, then tzIt was examined by 60 seconds
Consider；
According to the grid-connected requirement of generating set, the maximum Load adjustment clipping for obtaining the primary frequency modulation of fired power generating unit is Δ PmaxAnd volume
Determining power is PN, the difference coefficient of governor is δ.
3. fired power generating unit primary frequency modulation performance performance assessment criteria calculation method according to claim 2, which is characterized in that examination
Perturbation process time range be 0-tz。
4. fired power generating unit primary frequency modulation performance performance assessment criteria calculation method according to claim 2, which is characterized in that described
Duration is 20 seconds.
5. fired power generating unit primary frequency modulation performance performance assessment criteria calculation method according to claim 2, which is characterized in that described
The calculation method of the additional weight coefficient of device electricity is as follows；
Derivation carried out to f (t) obtain the expression formula of frequency change rate be
The change rate f'(t of system frequency f (t) and frequency) is normalized, the contribution during primary frequency modulation is obtained
Index coefficient is respectively f*(t) and f'*(t)；Wherein, Δ t is the time interval of sampling；
And then it obtains comprehensive additional weight coefficient and is
K (t)=f*(t)+f'*(t) (1)。
6. fired power generating unit primary frequency modulation performance performance assessment criteria calculation method according to claim 5, which is characterized in that will be
The change rate f'(t of system frequency f (t) and frequency) it is normalized, obtain the contributory index coefficient during primary frequency modulation
Respectively f*(t) and f'*(t), the specific method is as follows:
In formula: f (t)maxAnd f'(t)maxIt is system frequency and the value of frequency change rate in time 0-tzBetween maximum value, f
(t)minAnd f'(t)minIt is system frequency and the value of frequency change rate in time 0-tzBetween minimum value, the range of t is 0-tz。
7. fired power generating unit primary frequency modulation performance performance assessment criteria calculation method according to claim 6, which is characterized in that primary
The practical device electricity for increasing power output of primary frequency modulation after frequency modulation unit additional weight is
The primary frequency modulation theory increases the device electricity contributed
As [f (t)-fN]×PN/fN/δ≥ΔPmaxWhen, then Δ Pj(t)=Δ Pmax；
As [f (t)-fN]×PN/fN/δ<ΔPmaxWhen, then Δ Pj(t)=[f (t)-fN]×PN/fN/δ；
In formula, P (0) is practical power output of the unit at 0 moment；fNFor the rated frequency of system.
8. fired power generating unit primary frequency modulation performance performance assessment criteria calculation method according to claim 7, which is characterized in that
As k (t) >=1, η=k (t) is enabled；
As k (t) < 1, η=1 is enabled.
9. fired power generating unit primary frequency modulation performance performance assessment criteria calculation method according to claim 8, which is characterized in that described
The calculation method of the primary frequency modulation performance performance assessment criteria value of unit is as follows:
10. a kind of fired power generating unit primary frequency modulation performance performance assessment criteria computing system, which is characterized in that the system comprises networks to connect
Mouth, memory and processor；Wherein,
The network interface, during for being received and sent messages between other ext nal network elements, signal is sended and received；
The memory, for storing the computer program instructions that can be run on the processor；
The processor, for when running the computer program instructions, perform claim to require any one of 1 to 9 thermoelectricity
The step of unit primary frequency modulation performance performance assessment criteria calculation method.
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| CN110190611A (en) * | 2019-06-04 | 2019-08-30 | 国网山东省电力公司 | The primary frequency modulation bearing calibration and system of grid cyclic wave change rate based on PMU |
| CN110350604A (en) * | 2019-07-18 | 2019-10-18 | 国网山东省电力公司电力科学研究院 | Fired power generating unit primary frequency modulation index estimation method based on static characteristic |
| CN110601236A (en) * | 2019-09-20 | 2019-12-20 | 国网山东省电力公司电力科学研究院 | Capacity selection method and device of flywheel energy storage compensation device |
| CN112018785A (en) * | 2020-09-02 | 2020-12-01 | 国网山东省电力公司电力科学研究院 | Receiving-end power grid flywheel energy storage frequency modulation method and system based on frequency disturbance complementation |
| CN112803501A (en) * | 2021-01-04 | 2021-05-14 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Self-optimization auxiliary frequency modulation method for thermal power generating unit based on machine learning algorithm |
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| CN110601236A (en) * | 2019-09-20 | 2019-12-20 | 国网山东省电力公司电力科学研究院 | Capacity selection method and device of flywheel energy storage compensation device |
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| CN112018785A (en) * | 2020-09-02 | 2020-12-01 | 国网山东省电力公司电力科学研究院 | Receiving-end power grid flywheel energy storage frequency modulation method and system based on frequency disturbance complementation |
| CN112803501A (en) * | 2021-01-04 | 2021-05-14 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Self-optimization auxiliary frequency modulation method for thermal power generating unit based on machine learning algorithm |
| CN112803501B (en) * | 2021-01-04 | 2023-09-08 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Self-optimizing auxiliary frequency modulation method for thermal power generating unit based on machine learning algorithm |
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Application publication date: 20190416 |