CN104319794B - A kind of alternating current-direct current control method for coordinating for improving system stability - Google Patents
A kind of alternating current-direct current control method for coordinating for improving system stability Download PDFInfo
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- CN104319794B CN104319794B CN201410643026.8A CN201410643026A CN104319794B CN 104319794 B CN104319794 B CN 104319794B CN 201410643026 A CN201410643026 A CN 201410643026A CN 104319794 B CN104319794 B CN 104319794B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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Abstract
The invention discloses a kind of alternating current-direct current control method for coordinating for improving system stability, belongs to Operation of Electric Systems control field, the method includes：When AC-DC hybrid power grid breaks down down, dominant eigenvalues are filtered, after straight process, quadratic polynomial curve matching is carried out to dominant eigenvalues, judges whether that meeting power ascension or power returns the condition of drop, realizes the lifting to dc power and returns drop.Meanwhile, coordinate PSS4B excitation additional controller's effects to become apparent from.The present invention can efficiently control interregional power-balance relation in electric power generator group rocking process, play suppression generator rotor angle and wave, and machine amount is cut in reduction, improves the Transient Stability Level and dynamic stability level of ac and dc systemses.
Description
Technical field
The invention belongs to Operation of Electric Systems control field, more particularly to a kind of alternating current-direct current coordination for improving system stability
Control method.
Background technology
As the transmission of electricity of increasing high power DC concentrates drop point to arrive load center, the huge scale of direct current transportation, soon
Fast control response ability brings the impact of series of complex and deep to the dynamic characteristic of electrical network, stable risk and control device
Change.DC transmission system active power amplitude is larger, and governing speed is fast, possesses in short-term and continues overladen ability, make
DC transmission system fast power be modulated to improve alternating current-direct current series-parallel connection bulk power grid transient stability margin provide it is new effective
Control device.By quick, the urgent modulation of dc power, interregional work(in electric power generator group rocking process is efficiently controlled
Rate equilibrium relation, plays suppression generator rotor angle and waves, improve the effect of stability limit.
Existing result of study shows, can provide the safe and stable operation water of alternating current-direct current electrical network using power emergent control
It is flat.But the cooperation research that drop is lifted and returned to direct current is few.The present invention is suppressed using the emergency lifting and time drop of power
Generator's power and angle first is put and the second amplitude put, and machine amount is cut in reduction, improves the Transient Stability Level and dynamic stability of system
Level.
Traditional Local stabilization measure mostly is power system stabilizer, presses down under a certain specific method of operation
The effect of low-frequency oscillation processed preferably, but due to being limited to by ornamental and feedback signal, is suppressing bulk power grid interval dynamic oscillation
The effect of aspect is limited.Being capable of more efficiently inhibition zone pattern and local using new power system stabilizer 4B
Low-frequency oscillation under pattern, so as to improve the stability of power system.
The content of the invention
The purpose of the present invention is can to coordinate the fast quick-recovery of control by alternating current-direct current in the case of electric power system fault to stablize.
A kind of alternating current-direct current control method for coordinating of raising system stability that the present invention is provided, specifically employs the following technical solutions：
A kind of alternating current-direct current control method for coordinating for improving system stability, the control method for coordinating are used for alternating current-direct current series-parallel connection
Electrical network；Characterized in that, the method comprising the steps of：
(1) when sending end electrical network occurs AC fault, start alternating current-direct current and coordinate control；
(2) the AC dominant eigenvalues between alternating current and direct current transmission system are carried out with low-pass filtering, is processed every straight；
(3) dominant eigenvalues through low-pass filtering, after every straight process are carried out curve fitting；
(4) judge generator's power and angle first puts whether meet power ascension or work(according to the matched curve of dominant eigenvalues
Rate returns drop condition, if meeting power ascension condition, execution step (5)；The execution step if meeting power and returning drop condition
(7)；Otherwise return to step (2)；
(5) power ascension is carried out according to power ascension proportionality coefficient；
(6) judge whether that meeting dc power lifts termination condition, if it is satisfied, then dc power is lifted terminate, otherwise,
Execution step (2)；
(7) returning drop proportionality coefficient according to power carries out power time drop；
(8) judge whether that meeting power returns drop termination condition, if it is, direct current returns drop terminate, otherwise, execution step
(4)。
The present invention can also further adopt following preferred version：
While direct current lifts back drop, coordinate PSS4B, according to the low-frequency oscillation frequency that electrical network is main, the PSS4B that adjusts ginsengs
Number, will be PSS4B installed capacities larger and close on oscillation center unit farther out, when electrical network generation low-frequency oscillation, PSS4B
Automatically power oscillation damping will be played a part of, makes the fast quick-recovery of system stable, particularly after the completion of HVDC Modulation, effect
It is particularly evident.
The present invention has following beneficial technique effect：
Drop is lifted back using dc power and PSS4B controls can efficiently control region in electric power generator group rocking process
Between power-balance relation, play suppression generator rotor angle and wave, machine amount is cut in reduction, improve the Transient Stability Level of ac and dc systemses with
And dynamic stability level.
Description of the drawings
Fig. 1 is the alternating current-direct current control method for coordinating schematic flow sheet of the raising system stability of the present invention；
Fig. 2 is that alternating current-direct current coordinates control effect comparison diagram.
Specific embodiment
Technical scheme is further described in detail with reference to Figure of description.
It is disclosed by the invention improve system stability alternating current-direct current control method for coordinating, its flow process as shown in Figure 1, specifically
Comprise the following steps：(1) in the case of sending end electrical network occurs AC fault, start alternating current-direct current and coordinate control.
(2) dominant eigenvalues are carried out with low-pass filtering, is processed every straight.
(3) in step (2), curve is fitted using quadratic polynomial.It is y=ax by curve matching2The two of+bx+c
Order polynomial, concrete steps：Data point will not be fully fallen in matched curve, if k-th point falls in matched curve, the
The coordinate of k point meets quadratic curve equation, i.e.,：
yk=axk 2+bxk+c
Wherein, a, b, c are respectively the undetermined coefficient of matched curve, ykThe performance number that k-th point of interconnection, xkRepresent k-th
The time of point.
(4) judge generator's power and angle first puts whether meet power ascension or work(according to the matched curve of dominant eigenvalues
Rate returns drop condition, if meeting power ascension condition, execution step (5)；The execution step if meeting power and returning drop condition
(7)；Otherwise return to step (2)；
If the performance number of certain sampled point is not on curve, its coordinate is unsatisfactory for curvilinear equation, has a residual error.
Residual error a little represented with residual sum of squares (RSS)：
Wherein, F (a, b, c) represents the residual sum of squares (RSS) of n sampled point.ykK-th point of performance number, xkRepresent k-th to adopt
The sampling instant of sampling point.
Target is to try to achieve parameter a, b, c so that this function takes minima.
Order ：
Equation solves the system of linear equations of a, b, c, and being write as the equivalent form of value is：
Solving equation group, obtains tri- undetermined parameters of a, b, c.
When a is less than 0, then judge that meeting dc power lifts condition, into step (5)；
When a is more than 0, then judge that meeting dc power returns drop condition, into step (7)；
Otherwise, return to step (2).
(5) power ascension is carried out according to power ascension proportionality coefficient.Two zero crossings before and after dominant eigenvalues crest
Place carries out power ascension, and first zero passage before first zero crossing i.e. first crest is lighted to second zero crossing i.e. ripple
First zero crossing behind peak only carries out power ascension, and the maximum of hoisting power, at the crest of matched curve, is KupP0,
Wherein, dominant eigenvalues value when P0 is stable state, Kup take 0.85.
(6) judge whether to meet power ascension termination condition, Rule of judgment is：1. the amplitude of last time matched curve and this
The difference in magnitude of matched curve is less than threshold value Up_End_Thrd1, and Up_End_Thrd1 values are 0.01kW；2. this fitting is bent
1., 2. two the amplitude of line is less than Up_End_Thrd2 with the ratio of the amplitude of the first pendulum, and Up_End_Thrd2 values are 30%, if
When individual condition is satisfied by, then direct current is lifted and is terminated, otherwise, execution step (2).
(7) returning drop proportionality coefficient according to power carries out power time drop, two before and after dominant eigenvalues trough zero crossing
Place carries out power ascension, and first zero passage before first zero crossing i.e. first trough is lighted to second zero crossing i.e. ripple
First zero crossing after paddy only carries out power and returns drop, and the maximum for returning drop power is, at trough, to be in the extreme value of curve
KdownP0, Kdown take dominant eigenvalues value when 0.5, P0 refers to stable state.
(8) judge whether that meeting power returns drop termination condition, Rule of judgment is：1. the amplitude of last time matched curve and this
The difference in magnitude of matched curve is less than threshold value Down_End_Thrd1, and Down_End_Thrd1 values are 0.01kW；2. this is intended
The ratio of the amplitude and the amplitude of the first pendulum of closing curve is less than Down_End_Thrd2, and Down_End_Thrd2 values are 30%, such as
When fruit is 1., 2. two conditions are satisfied by, then direct current returns drop and terminates, otherwise, execution step (2).
In addition, the application coordinates stablizing for PSS4B effects meeting acceleration system while direct current lifts back drop.According to electricity
The low-frequency oscillation frequency that host wants, PSS4B parameters of adjusting, by it is PSS4B installed capacities larger and it is close from oscillation center farther out
On unit, when electrical network occurs low-frequency oscillation, PSS4B will play a part of power oscillation damping automatically, make system quickly extensive
Multiple stable, particularly after the completion of HVDC Modulation, effect is particularly evident, may be referred to the comparison diagram of accompanying drawing 2, by straight to certain friendship
After stream serial-parallel power grid does N-1 failures, the curve of dominant eigenvalues after adopting various measures, specially：1. cut machine+direct current to be lifted,
Can quickly make power steady.
2. cut machine+direct current lifting+direct current and return drop, in the second pendulum and the 3rd pendulum, amplitude ratio 2. amplitude 1. is little, says
Bright direct current lifting+direct current returns the little of the simple direct current lifting of impulse ratio of drop, is more beneficial for the recovery of system.3. cut machine+direct current to carry
Liter+direct current returns drop+PSS4B, and curve was mainly direct current and is playing regulatory role, with 3. difference less, after 5s, embodies before 5 seconds
Vibrate for 0.26Hz for frequency, PSS4B is fast and effeciently suppressed to which, finally in the presence of direct current and PSS4B, system
Recover normal.
Example given above not makees any formal to illustrate the present invention and its practical application to the present invention
Restriction, any one professional and technical personnel in the range of without departing from technical solution of the present invention, according to above technology and
Method makees certain modification and change when the Equivalent embodiments for being considered as equivalent variations.
Claims (6)
1. it is a kind of improve system stability alternating current-direct current control method for coordinating, the control method for coordinating be used for alternating current-direct current series-parallel connection electricity
Net；Characterized in that, the method comprising the steps of：
(1) when sending end electrical network occurs AC fault, start alternating current-direct current and coordinate control；
(2) the AC dominant eigenvalues between alternating current and direct current transmission system are carried out with low-pass filtering, is processed every straight；
(3) dominant eigenvalues through low-pass filtering, after every straight process are carried out curve fitting；
(4) judge that generator's power and angle first is put according to the matched curve of dominant eigenvalues and whether meet power ascension or power time
Drop condition, if meeting power ascension condition, execution step (5)；The execution step (7) if meeting power and returning drop condition；
Otherwise return to step (2)；
(5) power ascension is carried out according to power ascension proportionality coefficient；Enter at two zero crossings before and after dominant eigenvalues crest
Row power ascension, lights to second zero crossing i.e. crest in first zero passage before first zero crossing i.e. first crest
First zero crossing only carry out power ascension, the maximum of hoisting power, at the crest of matched curve, is KupP0, wherein,
Dominant eigenvalues value when P0 is stable state, Kup take 0.85；
(6) judge whether that meeting dc power lifts termination condition, if it is satisfied, then dc power is lifted terminating, otherwise, perform
Step (2)；
(7) returning drop proportionality coefficient according to power carries out power time drop；
(8) judge whether that meeting power returns drop termination condition, if it is, direct current returns drop terminate, otherwise, execution step (4).
2. alternating current-direct current control method for coordinating according to claim 1, it is characterised in that：
In step (3), dominant eigenvalues matched curve is：
yk=axk 2+bxk+c
Wherein, a, b, c are respectively the undetermined coefficient of matched curve, ykThe performance number of k-th sampled point of interconnection, xkRepresent k-th
The sampling instant of sampled point.
3. alternating current-direct current control method for coordinating according to claim 2, it is characterised in that：
In step (4), solved according to below equation group first and obtain undetermined coefficient a, b, c：
Wherein, xkFor the sampling instant of k-th sampled point, ykFor the performance number of k-th sampled point of interconnection, n is sampling number；
When a is less than 0, then judge that meeting dc power lifts condition, into step (5)；
When a is more than 0, then judge that meeting dc power returns drop condition, into step (7)；
Otherwise, return to step (2).
4. the alternating current-direct current control method for coordinating according to claim 1 or 3, it is characterised in that：
In step (6), judge whether to meet power ascension termination condition, Rule of judgment is：1. the amplitude of last time matched curve
Threshold value Up_End_Thrd1 is less than with the difference in magnitude of this matched curve, wherein Up_End_Thrd1 values are 0.01kW；②
The amplitude of this matched curve is less than Up_End_Thrd2 with the ratio of the amplitude of the first pendulum, and wherein Up_End_Thrd2 values are
30%；If 1., 2. two conditions are satisfied by, direct current is lifted and is terminated, otherwise, return to step (2).
5. the alternating current-direct current control method for coordinating according to claim 1 or 3, it is characterised in that：
In step (7), power ascension is carried out at two zero crossings before and after dominant eigenvalues trough, in first zero crossing
First zero passage before i.e. first trough is lighted first zero crossing to second zero crossing i.e. trough and only carries out power
Drop is returned, return the maximum of drop power in the extreme value of curve be at trough is KdownP0, and Kdown takes connection when 0.5, P0 refers to stable state
Winding thread performance number.
6. the alternating current-direct current control method for coordinating according to claim 1 or 3, it is characterised in that：
In step (8), judge whether that meeting power returns drop termination condition, Rule of judgment is：1. the amplitude of last time matched curve
Threshold value Down_End_Thrd1 is less than with the difference in magnitude of this matched curve, Down_End_Thrd1 values are 0.01kW；②
The amplitude of this matched curve is less than Down_End_Thrd2 with the ratio of the amplitude of the first pendulum, and Down_End_Thrd2 values are
30%, if 1., when 2. two conditions are satisfied by, direct current returns drop to be terminated, otherwise, return to step (2).
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| CN105048467B (en) * | 2015-04-09 | 2019-01-04 | 国家电网公司 | A kind of layered distribution type alternating current-direct current coordinated control system and control method |
| CN105743106B (en) * | 2016-03-10 | 2019-04-09 | 西南交通大学 | The structure of power system stabilizer 4B a kind of is improved and method for parameter configuration |
| CN106208125B (en) * | 2016-08-01 | 2018-10-16 | 国家电网公司 | A kind of alternating current-direct current control method for coordinating of reply alternating current circuit catastrophe failure |
| CN107181254B (en) * | 2016-11-23 | 2020-04-14 | 国电南瑞科技股份有限公司 | Matrix type quantization index calculation and alternating current-direct current coordination control method for multiple stability problems |
| CN110556838B (en) * | 2018-05-31 | 2023-02-03 | 中国电力科学研究院有限公司 | Method and device for stabilizing frequency of power supply direct current sending system |
| CN109361232B (en) * | 2018-11-02 | 2021-11-02 | 中国电力科学研究院有限公司 | Method and system for controlling voltage stabilization of extra-high voltage direct current layered feed-in power grid |
| CN110808595B (en) * | 2019-11-20 | 2021-02-12 | 国家电网公司华中分部 | Method for coordinately optimizing transient stability and dynamic stability of excitation gain |
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| CN103475010B (en) * | 2013-08-09 | 2015-05-13 | 国家电网公司 | Transient stabilization control method for interconnection electrical network after impact disturbance |
| CN104079010B (en) * | 2014-03-16 | 2017-06-16 | 国家电网公司 | It is a kind of to cut the transient stability emergency control policy computational methods that machine is mutually coordinated with direct-current emergency algorithm for power modulation |
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