CN110376482A - A kind of frequency run method suitable for sending end bulk power grid - Google Patents
A kind of frequency run method suitable for sending end bulk power grid Download PDFInfo
- Publication number
- CN110376482A CN110376482A CN201910575653.5A CN201910575653A CN110376482A CN 110376482 A CN110376482 A CN 110376482A CN 201910575653 A CN201910575653 A CN 201910575653A CN 110376482 A CN110376482 A CN 110376482A
- Authority
- CN
- China
- Prior art keywords
- frequency
- mains
- unit
- power
- power grid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention discloses a kind of frequency run method suitable for sending end bulk power grid, the following steps are included: test forefathers are that the AGC for exiting the grid-connected unit of power grid and frequency modulation frequency modulation adjust operation Step 1: the period of selection grid generation power output and load stabilization is tested；Step 2: selecting frequency disturbance source of several units as the grid power test unit disturbed and mains frequency attribute testing in power grid；Step 3: carrying out frequency step upset test, mains frequency dynamic characteristic is analyzed；Step 4: carrying out frequency slope upset test, mains frequency static characteristic is analyzed.Limitation existing for the current mains frequency characteristic test method of effective solution of the present invention, uncertainty influence, the problems such as test difficulty is big and security risk is big vulnerable to frequency modulation frequency modulation.
Description
Technical field
The invention belongs to technical field of power systems, specifically a kind of frequency run side suitable for sending end bulk power grid
Method.
Background technique
With a large amount of operations of extra-high voltage direct-current transmission engineering and being continuously increased for new energy source machine kludge capacity, power grid fortune
Capable and structure more sophisticated, system power balance and frequency modulation difficulty continue to increase.DC high-power locking (locking in succession) will be right
Mains frequency causes to seriously threaten safely.Based on bulk power grid frequency security problems faced and risk, need to carry out bulk power grid frequency
The research of rate characteristic site-test analysis, it is horizontal to promote the prevention and control of mains frequency security risk.The frequency characteristic of power grid can be from static characteristic
It is characterized comprehensively in terms of dynamic characteristic two.
Primary frequency modulation is the important means for maintaining power system frequency stable.The scale of electric system is bigger, complexity
Higher, the requirement to Primary frequency control ability is higher.The frequency characteristic coefficient measured value of power grid is reflection primary frequency modulation characteristic
Important evidence is widely applied in terms of ACE calculating, CPS, is design accident frequency control system and implementation frequency control
The important parameter of examination determines the harmony of primary frequency regulation of power network and tie--line control.Therefore design is invented one kind and is suitable for
The frequency run method of bulk power grid has a very important significance.
Static frequency characteristic factor beta is the intrinsic frequency characteristic coefficient of electric system, by generator primary frequency modulation characteristic and
Static Load frequency characteristic codetermines, and reflects the static change relationship of power and frequency, unit MW/0.1Hz.Power train
Relative value and its frequency after the occurring when physical significance for static frequency characteristic of uniting is electric system generation power shortage Δ P is steady
State deviation delta f∞The ratio between the relative value of (difference of frequency steady-state value after the frequency and generation when power shortage occurs) and system hair
Motor group and load are coefficient as a result, its expression formula are as follows:
Ks=(Δ P/PN0)/(Δf∞/fN0)
Ks=KG+KL
Wherein PN0And fN0For the total load and system frequency before power shortage occurs.
The dynamic frequency characteristic of electric system refers to that system occurs power shortage and generates the mistake that frequency declines (or rising)
Journey.According to the classical theory of circuit dynamic process, Dynamic Frequency In Power Systems characteristic is the curve for sorting out decaying by index,
Formula is as follows:
f*=f0*-Δf∞*(1-e-t/Tf)
In formula, f*For the system frequency of moment t after power shortage, f0*For power shortage initial time system frequency, Δ f∞*
The difference of steady frequency and initial frequency, T after occurring for power shortagefFor system frequency time constant of fall, it and whole system
Rotating part machinery inertial time constant TxThere is following relationship:
In formula, PFeFor system unit output, PFHeFor system loading, Δ PF*For unit output variation, Δ PFHe*It is negative for system
Lotus variation.
Currently, the domestic research method to mains frequency characteristic mainly meets specific want according to what is occurred in operation of power networks
The frequency large disturbances event asked disturbs the power of front and back power grid, frequency stabilization value using the data record analysis to the event, with
And power grid power output or load disturbance amount analytical calculation mains frequency characteristic when event generation.There are three aspects in this method.
First is that in practical applications, which leads to the limitation of this method very to the particular requirement of mains frequency perturbation process
It by force, can only with this method practical frequency static characteristic coefficient because the frequency of such mains frequency large disturbances process appearance is very low
The generation for passively waiting such grid disturbance event has great uncertainty.Second is that due in power grid day-to-day operation it is many simultaneously
The AGC function of net unit is put into, and the frequency modulation frequency modulation task of power grid is undertaken by frequency modulation brand-name computer group, and institute is difficult to avoid down in this way
Influence of the unit frequency modulation frequency modulation to mains frequency fluctuation process, and then seriously affect the actual measurement to mains frequency static characteristic coefficient
Analysis precision.Third is that analyzing the frequency characteristic of power grid by two Power System Steady-state operating points of disturbance front and back, it is difficult accurately to divide
Analyse the frequency omnicharacteristic of power grid whole service frequency band under a certain method of operation.Electricity is distinguished in addition, being not known in Practical
Net frequency static, dynamic characteristic concept are easily obscured in practical application.
Summary of the invention
It is an object of the invention to provide a kind of frequency run methods suitable for sending end bulk power grid, to solve current power grid
Limitation existing for frequency run method, uncertainty, influenced vulnerable to frequency modulation frequency modulation, test difficulty it is big and security risk is big
The problems such as.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of frequency run method suitable for sending end bulk power grid, comprising the following steps:
S1 selects the period of grid generation power output and load stabilization to be tested, and test forefathers are to exit the grid-connected machine of power grid
The AGC and frequency modulation frequency modulation of group adjust operation；
S2, the test unit for selecting several units in power grid as grid power and disturbing and mains frequency attribute testing
Frequency disturbance source；
S3 carries out frequency step upset test, analyzes mains frequency dynamic characteristic；
S4 carries out frequency slope upset test, analyzes mains frequency static characteristic.
Specifically, in step S2, the adjustable power output of the test unit accounts for 1% or more of power grid total load.
Specifically, in step S2, the implementation method in the frequency disturbance source of the mains frequency attribute testing are as follows: jumped by beating
With two units in unit power output or fast increase, fastly subtract the power output of two units in same unit and realize the frequency disturbance
Source.
Specifically, in step S3, the frequency step upset test point multiple groups are carried out, and every group of test jumps same unit by beating
The power output of interior two units realizes frequency disturbance, records the initial frequency f of every group of test0, disturbance quantity Δ P, extreme frequencies fmaxWith
Mains frequency extremum characteristic factor beta is calculated further according to the data of record in effective frequency differencem；By calculating multiple groups mains frequency
Extremum characteristic factor betamMean value obtain final mains frequency extremum characteristic coefficient；
The mains frequency extremum characteristic factor betamCalculation formula are as follows:
βm=Δ P/ (fmax-f0)
Wherein, Δ P is grid power disturbance quantity, unit MW；fmaxFor the frequency pole during grid power large disturbances
Value, unit Hz, specially disturbed in frequency process maximum frequency or frequency under disturb during minimum frequency；f0It is disturbed for frequency
The initial frequency of dynamic process, unit Hz.
Further, it during mains frequency large disturbances, is acted by unit primary frequency modulation and unit set inertia is by power grid
Frequency modulation(PFM) extreme value fmax, then gradually restore to initial frequency f0；
The initial frequency f0To consider the initial frequency after unit primary frequency modulation dead zone influences；If initial frequency f0It is adjusted to
Frequency extremes fmaxDuring have passed through unit primary frequency modulation dead zone, then f0Value is 49.967 Hz or 50.033Hz；If frequency
Rate initial value f0Outside 50 ± 0.033Hz range, then f0Value is actual frequency initial value.
Specifically, in step S4, when carrying out frequency slope upset test, increase fastly/subtract unit output fastly by way of it is real
Existing frequency disturbance；It is fast every time increase/subtract unit output fastly after, form new steady frequency after stablizing 15~25 seconds；The unit
Power output variation increases or decreases for one direction, and the power output variation of the unit is in the preset mains frequency maximum value of test and most
Within the scope of small value；
By measurement power grid in the frequency of multiple steady working condition points and the corresponding relationship of power, pass through data fitting and described point
Mode, segmentation measurement power grid static frequency characteristic coefficient.
Further, it is described segmentation measurement power grid static frequency characteristic coefficient method the following steps are included:
S41, enabling two units of disturbing source, respectively band 0MW contributes, and enables the first frequency modulation factory that mains frequency is adjusted to 49.98-
Between 50.02Hz, and keep stablizing one minute；
S42 raises mains frequency by increasing the power output (increasing unit output power) of two 0MW units fastly；Work as power grid
When frequency is between 49.96-50.04Hz, the fast step-length that increases is set as 100MW (increasing 100MW power every time), increases load knot every time
Stablize after beam 10 seconds；When mains frequency is higher than 50.04Hz, the fast step-length that increases is set as 200MW (increasing 200MW power every time), often
Stablize after secondary increasing load 20 seconds；Gradually mains frequency is raised to 50.08Hz or more；
S43 reduces mains frequency by subtracting the power output (reducing unit output power) of unit fastly；When mains frequency is higher than
When 50.04Hz, subtracts step-length fastly and be set as 200MW (reducing 200MW power every time), stablize 20 seconds after each load shedding；Work as electricity
When net frequency is between 49.96-50.04Hz, subtracts step-length fastly and be set as 100MW (reducing 100MW power every time), each load shedding
After stablize 10 seconds；Mains frequency is gradually reduced to 49.96Hz or less；
S44 calculates power grid according to the two groups of slope high-frequency datas measured in step S42, S43 and two groups of slope low-frequency datas
In the corresponding relationship of multiple steady working condition dot frequencies and power；Unit primary frequency modulation clipping is analyzed to the shadow of mains frequency static characteristic
It rings, two groups of slope high-frequency datas is carried out docking fitting with two groups of slope low-frequency datas, obtain mains frequency static state omnicharacteristic ginseng
Number；
S45 after experiment, enables the first frequency modulation factory that mains frequency is restored normal.
Further, select one in power grid or the biggish Hydropower Unit of several single-machine capacities as power grid in the present invention
The test unit of power disturbance；Other hydroelectric power plants are the first frequency modulation of the whole network factory in specified net, carry out each pilot project original frequency
Modulation, fixation and the recovery of frequency after the test, initial operating condition is met the requirements during guarantee test.
Compared with prior art, the beneficial effects of the present invention are: the present invention is increased fastly using hydroelectric power plant, subtracts unit output fastly
Mode manufactures power grid ramp type frequency disturbance, by the corresponding relationship of steady working condition dot frequency and power, with data fit approach
Tested mains frequency static state omnicharacteristic is completed in actual measurement；While the present invention nets two large-scale hydroelectric machines in interior unit connection using jump is played
The mode of group manufactures the big step disturbance of power grid actual frequency, has surveyed the dynamic characteristic of tested the whole network frequency, examines in net often
Power supply unit primary frequency modulation action performance is advised, there is guiding significance to the research of sending end bulk power grid frequency characteristic.
Detailed description of the invention
Fig. 1 is a kind of schematic process flow diagram of the frequency run method suitable for sending end bulk power grid of the present invention；
Fig. 2 is disturbing source hydroelectric power plant electric hookup in the embodiment of the present invention；
Fig. 3 is the big step disturbance test frequency wave process schematic diagram of four power of power grid in the embodiment of the present invention；
Fig. 4 is actual measurement high frequency and changed power static curve figure in the embodiment of the present invention；
Fig. 5 is actual measurement low frequency and changed power static curve figure in the embodiment of the present invention；
Fig. 6 is the whole network static frequency characteristic schematic diagram in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the present invention, technical solution of the present invention is clearly and completely described, it is clear that
Described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the implementation in the present invention
Example, those of ordinary skill in the art's all other embodiment obtained under the conditions of not making creative work belong to
The scope of protection of the invention.
As shown in Figure 1, a kind of frequency run method suitable for sending end bulk power grid is present embodiments provided, including with
Lower step:
S1 selects the period of grid generation power output and load stabilization to be tested, and test forefathers are to exit the grid-connected machine of power grid
The AGC and other frequency modulation frequency modulations of group adjust operation, it is ensured that test process is not influenced by electric grid secondary frequency modulation；
S2 selects that the test unit that power output biggish one or several units are disturbed as grid power is adjusted in power grid
(the adjustable power output of test unit should account for 1% or more of power grid total load)；Internal wiring of standing is unit connection mode, such as Fig. 2 institute
Show；Increased by playing jump with two units in unit or fastly, subtract two unit output modes in same unit fastly, realizes that mains frequency is special
Property test frequency disturbing source；In figure: 11,10,12,21,20,22,31,32 be bus-tie circuit breaker；1F, 2F, 3F, 4F, 5F, 6F points
It Wei not 6 generating sets；1B, 2B, 3B, 4B, 5B, 6B are respectively the gate out switch of 6 generating sets；
S3 carries out frequency step upset test, analyzes mains frequency dynamic characteristic；
S4 carries out frequency slope upset test, analyzes mains frequency static characteristic.
Specifically, in step S2, the adjustable power output of the test unit accounts for 1% or more of power grid total load.
Specifically, in step S2, the implementation method in the frequency disturbance source of the mains frequency attribute testing are as follows: jumped by beating
With two units in unit power output or fast increase, fastly subtract the power output of two units in same unit and realize the frequency disturbance
Source.
Specifically, in step S3, the frequency step upset test point multiple groups are carried out, and every group of test jumps same unit by beating
The power output of interior two units realizes frequency disturbance, records the initial frequency f of every group of test0, disturbance quantity Δ P, extreme frequencies fmaxWith
Mains frequency extremum characteristic factor beta is calculated further according to the data of record in effective frequency differencem；By calculating multiple groups mains frequency
Extremum characteristic factor betamMean value obtain final mains frequency extremum characteristic coefficient；During four groups of frequency step upset tests
Frequency curve is as shown in Figure 3；
During actual tests, the relationship of frequency extremes and system disturbance amount in multiple point concern disturbance dynamic process,
The ability for resisting power disturbance to characterize system frequency, quantitatively characterizing power grid mechanical inertia are horizontal.Define mains frequency extreme value
Characteristic coefficient βm, for reflecting the corresponding relationship of mains frequency extreme value Yu power disturbance amount, with coefficient approximation characterization system frequency
Rate dynamic characteristic；
The mains frequency extremum characteristic factor betamCalculation formula are as follows:
βm=Δ P/ (fmax_f0)
Wherein, Δ P is grid power disturbance quantity, unit MW；fmaxFor the frequency pole during grid power large disturbances
Value, unit Hz, specially disturbed in frequency process maximum frequency or frequency under disturb during minimum frequency；f0It is disturbed for frequency
The initial frequency of dynamic process, unit Hz.
Further, it during mains frequency large disturbances, is acted by unit primary frequency modulation and unit set inertia is by power grid
Frequency modulation(PFM) extreme value fmax, then gradually restore to initial frequency f0；Therefore special in order to more accurately embody system frequency dynamic
Property, power disturbance amount and frequency extremes relationship, the initial frequency f are calculated more accurately0It should be and consider unit primary frequency modulation
Initial frequency after the influence of dead zone；If initial frequency f0It is adjusted to frequency extremes fmaxDuring to have passed through unit primary frequency modulation dead
Area, then f0Value is 49.967Hz (low-frequency excitation) or 50.033Hz (high frequency components)；If initial frequency f0In 50 ±
Outside 0.033Hz range, then f0Value is actual frequency initial value.
Specifically, in step S4, when carrying out frequency slope upset test, increase fastly/subtract unit output fastly by way of it is real
Existing frequency disturbance；Increase/subtracting unit output fastly fastly every time, (power output increase and decrease amount should have obviously not inside and outside primary frequency regulation of power network dead zone
Together, it is advisable so that mains frequency 0.01Hz or so can be changed) after, stablize 15~25 seconds, so that power grid forms newly steady by adjusting
State frequency；The power output variation of the unit increases or decreases for one direction, avoids the adjustment repeatedly of unit output during test,
Until reaching the preset mains frequency maximum value of test or minimum value；
By measurement power grid in the frequency of multiple steady working condition points and the corresponding relationship of power, pass through data fitting and described point
Mode, segmentation measurement power grid static frequency characteristic coefficient.
Due to the presence for the unit primary frequency modulation frequency dead band, clipping that generate electricity by way of merging two or more grid systems, static frequency characteristic coefficient is according to frequency
The difference in region presents segmented characterizing；It is only the straight line of slope with a static frequency characteristic factor beta during actual tests
Static characteristic of the relationship to reflect grid power and frequency affects the control effect of mains frequency with one-sidedness, because
This answers practical frequency static state omnicharacteristic；System frequency static state omnicharacteristic divides since the presence in grid-connected unit primary frequency modulation dead zone is presented
Section characteristic；According to operation of power networks criterion, fired power generating unit primary frequency modulation the dead time is ± 0.033Hz, hydroelectric units primary frequency modulation
The dead time is ± 0.5Hz；When actual electric network is run, Hydropower Unit more compensates to obtain two detailed rules and regulations, and dead zone is standing
It is set to ± 0.4Hz；In order to survey mains frequency static state omnicharacteristic, speed increases in the way of disturbing source hydroelectric power plant fixed step size, speed subtracts out
Power, measurement power grid are segmented in such a way that data fitting is with described point in the corresponding relationship of multiple steady working condition dot frequencies and power
Measure the static frequency characteristic coefficient of power grid.
Specifically, it is described segmentation measurement power grid static frequency characteristic coefficient method the following steps are included:
S41, enable the unit of disturbing source hydroelectric power plant two respectively band 0MW contribute, enable the first frequency modulation factory by system frequency adjust to
Between 49.98-50.02Hz and keep stablizing one minute；
S42 is pushed away by increasing the power output (governor electricity/manual mode increases unit output power) of two 0MW units fastly
Rise mains frequency；When mains frequency is between 49.96-50.04Hz, fast increasing step-length is set as 100MW and (increases 100MW every time
Power), stablize 10 seconds after increasing load every time；When mains frequency is higher than 50.04Hz, the fast step-length that increases is set as 200MW (every time
Increase 200MW power), stablize 20 seconds after increasing load every time；Gradually mains frequency is raised to 50.08Hz or more；
S43 reduces mains frequency by subtracting the power output (reducing unit output power) of unit fastly；When mains frequency is higher than
When 50.04Hz, subtracts step-length fastly and be set as 200MW (reducing 200MW power every time), stablize 20 seconds after each load shedding；Work as electricity
When net frequency is between 49.96-50.04Hz, subtracts step-length fastly and be set as 100MW (reducing 100MW power every time), each load shedding
After stablize 10 seconds；Mains frequency is gradually reduced to 49.96Hz or less；
S44 calculates power grid according to the two groups of slope high-frequency datas measured in step S42, S43 and two groups of slope low-frequency datas
In the corresponding relationship of multiple steady working condition dot frequencies and power；As shown in Figure 4,5, further analysis fired power generating unit primary frequency modulation limits
Two groups of slope high-frequency datas are carried out docking fitting, be obtained by influence of the width to mains frequency static characteristic with two groups of slope low-frequency datas
To mains frequency static state omnicharacteristic parameter.It is as shown in Figure 6 to draw the whole network static frequency characteristic schematic diagram.Dotted portion is the whole network frequency
The analysis of rate static characteristic is as a result, wherein dotted line broken line part is the influence for considering grid-connected fired power generating unit primary frequency modulation clipping.
S45 after experiment, enables the first frequency modulation factory that mains frequency is restored normal.
Further, select one in power grid or the biggish Hydropower Unit of several single-machine capacities as power grid in the present invention
The test unit of power disturbance；Other hydroelectric power plants are the first frequency modulation of the whole network factory in specified net, carry out each pilot project original frequency
Modulation, fixation and the recovery of frequency after the test, initial operating condition is met the requirements during guarantee test.
Specifically, frequency control system during test: in order to which operating condition initial during guarantee test is met the requirements, during test
It is specified net in other a certain hydroelectric power plants be the first frequency modulation of the whole network factory, carry out the adjustment of each pilot project original frequency, fixation and
The recovery of frequency after the test.
The frequency control system includes:
Frequency normal control after frequency disturbance occurs, must not manually adjust unit output (including first in the whole network 3 minutes
Frequency modulation factory), carry out test data record, after 3 minutes, the first frequency modulation factory needless to say the rapid recovery system frequency of transfer order to 50.00 ±
Within 0.1Hz；
Frequency anomaly control, in order to guarantee that frequency is not out-of-limit, takes frequency anomaly control measure during test disturbance,
Specifically: when system frequency exceeds 50.00 ± 0.15Hz, the first frequency modulation factory needless to say transfer order recovery system frequency to 50.00 ±
Within 0.1Hz；When system frequency exceeds 50.00 ± 0.18Hz, all Direct Modulated Power Plants of the whole network needless to say transfer order recovery system frequency
To 50.00 ± 0.1Hz.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of frequency run method suitable for sending end bulk power grid, which comprises the following steps:
S1 selects the period of grid generation power output and load stabilization to be tested, and test forefathers are to exit the grid-connected unit of power grid
AGC and frequency modulation frequency modulation adjust operation；
S2 selects frequency of several units as the grid power test unit disturbed and mains frequency attribute testing in power grid
Disturbing source；
S3 carries out frequency step upset test, analyzes mains frequency dynamic characteristic；
S4 carries out frequency slope upset test, analyzes mains frequency static characteristic.
2. a kind of frequency run method suitable for sending end bulk power grid according to claim 1, which is characterized in that step
In rapid S2, the adjustable power output of the test unit accounts for 1% or more of power grid total load.
3. a kind of frequency run method suitable for sending end bulk power grid according to claim 1, which is characterized in that step
In rapid S2, the implementation method in the frequency disturbance source of the mains frequency attribute testing are as follows: jumped by beating with two units in unit
Power output or fast increase, subtract the power output of two units in same unit fastly to realize the frequency disturbance source.
4. a kind of frequency run method suitable for sending end bulk power grid according to claim 1, which is characterized in that step
In rapid S3, the frequency step upset test point multiple groups are carried out, and every group of test passes through the power output beaten and jumped with two units in unit
It realizes frequency disturbance, records the initial frequency f of every group of test0, disturbance quantity Δ P, extreme frequencies fmaxWith effective frequency difference, further according to
Mains frequency extremum characteristic factor beta is calculated in the data of recordm；By calculating multiple groups mains frequency extremum characteristic factor betam's
Mean value obtains final mains frequency extremum characteristic coefficient；
The mains frequency extremum characteristic factor betamCalculation formula are as follows:
βm=Δ P/ (fmax_f0)
Wherein, Δ P is grid power disturbance quantity, unit MW；fmaxIt is single for the frequency extremes during grid power large disturbances
Position be Hz, specially disturbed in frequency process maximum frequency or frequency under disturb during minimum frequency；f0For frequency disturbance mistake
The initial frequency of journey, unit Hz.
5. a kind of frequency run method suitable for sending end bulk power grid according to claim 4, which is characterized in that
During mains frequency large disturbances, acted by unit primary frequency modulation and unit set inertia by mains frequency modulate extreme value fmax, then by
Step is restored to initial frequency f0；
The initial frequency f0To consider the initial frequency after unit primary frequency modulation dead zone influences；If initial frequency f0It is adjusted to frequency
Extreme value fmaxDuring have passed through unit primary frequency modulation dead zone, then f0Value is 49.967Hz or 50.033Hz；If initial frequency
f0Outside 50 ± 0.033Hz range, then f0Value is actual frequency initial value.
6. a kind of frequency run method suitable for sending end bulk power grid according to claim 1, which is characterized in that step
In rapid S4, when carrying out frequency slope upset test, increase fastly/subtract unit output fastly by way of realize frequency disturbance；It is fast every time
Increase/subtract unit output fastly after, form new steady frequency after stablizing 15~25 seconds；The power output variation of the unit is that one direction increases
It adds deduct few, the power output variation of the unit is within the scope of the preset mains frequency maximum value of test and minimum value；
By measurement power grid in the frequency of multiple steady working condition points and the corresponding relationship of power, pass through the side of data fitting and described point
Formula, the static frequency characteristic coefficient of segmentation measurement power grid.
7. a kind of frequency run method suitable for sending end bulk power grid according to claim 6, which is characterized in that institute
State segmentation measurement power grid static frequency characteristic coefficient method the following steps are included:
S41, enable two units of disturbing source respectively band 0MW contribute, enable the first frequency modulation factory by mains frequency be adjusted to 49.98-50.02Hz it
Between, and keep stablizing one minute；
S42 raises mains frequency by increasing the power output of two 0MW units fastly；When mains frequency be in 49.96-50.04Hz it
Between when, the fast step-length that increases is set as 100MW, stablizes 10 seconds after increasing load every time；It is fast to increase when mains frequency is higher than 50.04Hz
Step-length is set as 200MW, stablizes 20 seconds after increasing load every time；Gradually mains frequency is raised to 50.08Hz or more；
S43 reduces mains frequency by subtracting the power output of unit fastly；When mains frequency is higher than 50.04Hz, subtracts step-length fastly and be set as
200MW stablizes 20 seconds after each load shedding；When mains frequency is between 49.96-50.04Hz, subtracts step-length fastly and be set as
100MW stablizes 10 seconds after each load shedding；Mains frequency is gradually reduced to 49.96Hz or less；
S44 calculates power grid more according to the two groups of slope high-frequency datas measured in step S42, S43 and two groups of slope low-frequency datas
The corresponding relationship of a steady working condition dot frequency and power；Influence of the unit primary frequency modulation clipping to mains frequency static characteristic is analyzed,
Two groups of slope high-frequency datas are carried out docking fitting with two groups of slope low-frequency datas, obtain mains frequency static state omnicharacteristic parameter；
S45 after experiment, enables the first frequency modulation factory that mains frequency is restored normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910575653.5A CN110376482A (en) | 2019-06-28 | 2019-06-28 | A kind of frequency run method suitable for sending end bulk power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910575653.5A CN110376482A (en) | 2019-06-28 | 2019-06-28 | A kind of frequency run method suitable for sending end bulk power grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110376482A true CN110376482A (en) | 2019-10-25 |
Family
ID=68251139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910575653.5A Pending CN110376482A (en) | 2019-06-28 | 2019-06-28 | A kind of frequency run method suitable for sending end bulk power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110376482A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687385A (en) * | 2019-11-01 | 2020-01-14 | 国网山东省电力公司电力科学研究院 | Grid-connected unit remote frequency disturbance testing method based on load interval dynamic adjustment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101105520A (en) * | 2007-08-08 | 2008-01-16 | 陕西电力科学研究院 | Generating set primary frequency regulation test method and emulating instrument for test |
| CN102323550A (en) * | 2011-09-09 | 2012-01-18 | 西北电网有限公司 | Primary frequency modulation adjusting performance determination method of generating set |
| CN106655159A (en) * | 2016-10-27 | 2017-05-10 | 中国电力科学研究院 | New energy power station primary frequency modulation capability testing system and testing method thereof |
| CN106908660A (en) * | 2017-02-27 | 2017-06-30 | 国家电网公司 | Mains frequency static characteristic coefficient testing method under the conditions of non-grid large disturbances |
| WO2018224866A1 (en) * | 2017-06-09 | 2018-12-13 | Ecole Polytechnique Federale De Lausanne (Epfl) | Method for estimating synchrophasors during static and dynamic conditions |
-
2019
- 2019-06-28 CN CN201910575653.5A patent/CN110376482A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101105520A (en) * | 2007-08-08 | 2008-01-16 | 陕西电力科学研究院 | Generating set primary frequency regulation test method and emulating instrument for test |
| CN102323550A (en) * | 2011-09-09 | 2012-01-18 | 西北电网有限公司 | Primary frequency modulation adjusting performance determination method of generating set |
| CN106655159A (en) * | 2016-10-27 | 2017-05-10 | 中国电力科学研究院 | New energy power station primary frequency modulation capability testing system and testing method thereof |
| CN106908660A (en) * | 2017-02-27 | 2017-06-30 | 国家电网公司 | Mains frequency static characteristic coefficient testing method under the conditions of non-grid large disturbances |
| WO2018224866A1 (en) * | 2017-06-09 | 2018-12-13 | Ecole Polytechnique Federale De Lausanne (Epfl) | Method for estimating synchrophasors during static and dynamic conditions |
Non-Patent Citations (1)
| Title |
|---|
| 孙骁强等: ""西北送端大电网频率特性试验方法"", 《电力系统自动化》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687385A (en) * | 2019-11-01 | 2020-01-14 | 国网山东省电力公司电力科学研究院 | Grid-connected unit remote frequency disturbance testing method based on load interval dynamic adjustment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Bonfiglio et al. | Design and implementation of a variable synthetic inertia controller for wind turbine generators | |
| CN110425092B (en) | Wind power grid-connected system oscillation source positioning system and method based on energy spectrum | |
| Piwko et al. | Subsynchronous resonance performance tests of the Slatt thyristor-controlled series capacitor | |
| EP2302754A1 (en) | A low frequency oscillation integrated analysis method and its system | |
| CN109217362A (en) | A kind of double-fed blower grid-connected system low-frequency oscillation disturbance source locating system and method | |
| CN105445582A (en) | Interconnection power grid primary frequency modulation responding performance assessment method | |
| US20210281071A1 (en) | Method and apparatus for detecting low-frequency oscillations | |
| CN106908660B (en) | Mains frequency static characteristic coefficient testing method under the conditions of non-grid large disturbances | |
| CN110376482A (en) | A kind of frequency run method suitable for sending end bulk power grid | |
| US10948527B2 (en) | Power system detection of sustained oscillations based on synchrophasor frequency measurements | |
| Follum et al. | Applications of a new nonparametric estimator of ambient power system spectra for measurements containing forced oscillations | |
| Petersen et al. | Addressing power oscillations damping requirements for wind power plants | |
| EP4086641A1 (en) | Method for measuring degree of stability of generator and power transmission line, and electrical grid control system | |
| CN108363007A (en) | A kind of photovoltaic virtual synchronous generator performance test device and method | |
| Lavanya et al. | Inertia monitoring in power systems: Critical features, challenges, and framework | |
| Follum et al. | Detecting and analyzing power system disturbances in PMU data with the open-source Archive Walker tool | |
| Ladakakos et al. | Assessment of wind turbines impact on the power quality of autonomous weak grids | |
| CN207817164U (en) | A kind of photovoltaic virtual synchronous generator performance test device | |
| Duggan et al. | Very Low-Frequency Oscillation Source Localization on Ireland's Power System | |
| CA3102711C (en) | Wind turbine and method for detecting low-frequency oscillations in an electrical supply grid | |
| Wilson | Managing oscillatory stability using on-line dynamics measurements | |
| Wu et al. | HHT-based power quality analysis and energy efficiency management | |
| CN113541135B (en) | Generalized inertia measurement method taking transient frequency falling reference track as uniform scale | |
| Varwandkar et al. | Frequency excursions in complex power systems—a modular approach | |
| CN110021951A (en) | A kind of the peace control design method and system of the receiving end extra-high voltage looped network of multi-infeed DC |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191025 |