CN106249105B - A kind of power system oscillation identifying system and its method - Google Patents
A kind of power system oscillation identifying system and its method Download PDFInfo
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- CN106249105B CN106249105B CN201610626040.6A CN201610626040A CN106249105B CN 106249105 B CN106249105 B CN 106249105B CN 201610626040 A CN201610626040 A CN 201610626040A CN 106249105 B CN106249105 B CN 106249105B
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- 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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- 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
- G01R31/088—Aspects of digital computing
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of power system oscillation identifying system and its method, the power system oscillation identifying system includes the information collection being linked in sequence and processing module, sinusoidal impedance computation module and oscillation identification module；The information collection and processing module judge whether the protection of route two sides acts, if two sides protection act, start sinusoidal impedance computation module for acquiring and calculating power-frequency voltage and power current；The sine impedance computation module is for calculating route sine comprehensive impedance；The oscillation identification module is for judging whether system vibrates, if electric system is vibrated, which sends block signal to protection equipment, otherwise sends trip signal to protection equipment.
Description
Technical field
The present invention relates to the technical field of relay protection of power system, more particularly to power system oscillation identifying system and
Its method.
Background technique
The interconnection of power grid large-scale area, causes power system oscillation to happen occasionally, it is possible to the malfunction of distance protection is caused,
Even threaten the safe and stable operation of electric system.Therefore, research is carried out to oscillation identifying schemes to have important practical significance
And engineering practical value.
The difficult point of building oscillation identifying schemes is concentrated mainly on two aspects: protecting first is that being latched under the simple oscillatory condition of system
Shield, prevents its malfunction；Second is that when breaking down during out-of-step blocking, it being capable of quick open and protection.Currently, the oscillation being widely used
Recognition methods specifically includes that measurement locus of impedance method, measurement resistance change rate method, is based onOscillation recognizer, be based on
Oscillation recognizer of compensation principle etc..Wherein, measurement locus of impedance method can be suitable for different system oscillation modes, but easily
It is influenced by system network architecture variation, and there is a problem of adjusting difficulty.Measurement resistance change rate method is applicable to different
Network structure and system operation mode, but the movement threshold value of this method is relied on and is manually set, and required delay is longer, certain
The application of this method is limited in degree.It is based onOscillation recognizer can reliably be opened under fault condition again in oscillation
Protection is put, but in the case where route two sides electromotive force amplitude is not equal, there are certain delays.Oscillation based on compensation principle is known
Other algorithm, error are affected by connections mode, and are difficult to adjust offset when load is heavier.
Therefore, it is desirable to have a kind of power system oscillation identifying system and its method that can overcome or at least mitigate the prior art
Drawbacks described above.
Summary of the invention
The purpose of the present invention is to provide a kind of power system oscillation identifying systems and its method to overcome in the prior art
The existing above problem.
To achieve the above object, the present invention provides a kind of method of power system oscillation identifying system, the electric system
Oscillation identifying system includes the information collection being linked in sequence and processing module, sinusoidal impedance computation module and oscillation identification module；
The information collection and processing module judge that route two sides are protected for acquiring and calculating power-frequency voltage and power current
Whether shield acts, if two sides protection act, starts sinusoidal impedance computation module；
The sine impedance computation module is for calculating route sine comprehensive impedance；
The oscillation identification module is for judging whether system vibrates, if electric system is vibrated, the module
Block signal is sent to protection equipment, otherwise sends trip signal to protection equipment；
Use the method for the power system oscillation identifying system, comprising the following steps:
(1) sinusoidal comprehensive impedance is defined, the sine comprehensive impedance is that route two sides sine measures the sum of impedance magnitude, institute
State sinusoidal comprehensive impedance is defined as:
|Zcom|=| Zmc|+|Znc|
Wherein, | Zmc| impedance is measured for route M side sine, | Znc| impedance, the sinusoidal survey are measured for route N side sine
Impedance is measured, value is that protection installation place measures the ratio between voltage sinusoidal component amplitude and measurement current amplitude；
(2) voltage phasor plane when analysis oscillation and voltage phasor plane when failure, electricity when analysis is vibrated
Phasor plane is pressed, when system is in oscillatory regime, sinusoidal comprehensive impedance is equal with the impedance magnitude of protected circuit；
(3) difference under fault condition again, construction oscillation in system oscillation, failure, oscillation according to sinusoidal comprehensive impedance
Identical criterion；
(4) judged according to oscillation identical criterion: when protection starts and meets oscillation identical criterion, that is, judging that system is sent out
Oscillation is given birth to, by protection blocking；When protection starts but is unsatisfactory for oscillation identical criterion, i.e. failure, protection act has occurred in judgement
In tripping.
Preferably, voltage phasor plane when step (2) the analysis failure occurs three through transition resistance in system and connects
When ground short circuit, route sine comprehensive impedance is greater than the modulus value of line impedance.
Preferably, the oscillation identical criterion in the step (3) are as follows:
||Zcom|-|ZL| | < KaRg
Wherein, transition resistance distribution coefficient KaIt can adjust and be For quilt
Protection circuit impedance angle, transition resistance RgCan according to different voltage class, choose three-phase ground short circuit when transition resistance most
Small value.
The present invention proposes a kind of power system oscillation identifying system and its method, and power system oscillation of the invention identifies system
System and its method are not influenced by system operation mode and cycle of oscillation, can accurately identify oscillation and failure, and in oscillation
It, being capable of correct quick open and protection again when failure；With certain adaptivity, not by the shadow of transition resistance and abort situation
It rings；Without obtaining the back side impedance of protection, calculation amount is small, and engineering practicability is strong.
Detailed description of the invention
Fig. 1 is a kind of power system oscillation identifying system structure chart.
Voltage phasor plane when Fig. 2 is oscillation.
Voltage phasor plane when Fig. 3 is failure.
Fig. 4 is power system oscillation equivalent model.
Fig. 5 is system equivalent electromotive force phasor relation figure.
Fig. 6 is Three-phase Power Systems short-circuit analysis model.
Specific embodiment
To keep the purposes, technical schemes and advantages of the invention implemented clearer, below in conjunction in the embodiment of the present invention
Attached drawing, technical solution in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or class
As label indicate same or similar element or element with the same or similar functions.Described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to use
It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.Under
Face is described in detail the embodiment of the present invention in conjunction with attached drawing.
In an of the invention broad embodiment: power system oscillation identifying system, information collection including sequential connection with
Processing module, sinusoidal impedance computation module and oscillation identification module；The information collection is with processing module for acquiring and calculating
Power-frequency voltage and power current, judge whether the protection of route two sides acts, if two sides protection act, start sinusoidal impedance computation
Module；The sine impedance computation module is for calculating route sine comprehensive impedance；The oscillation identification module is for judging system
Whether system vibrates, if electric system is vibrated, which sends block signal to protection equipment, otherwise sets to protection
Preparation send trip signal.
In another broad embodiment of the present invention: using the method for power system oscillation identifying system, comprising the following steps:
(1) sinusoidal comprehensive impedance is defined；
(2) voltage phasor plane when analysis oscillation and voltage phasor plane when failure；
(3) difference under fault condition again, construction oscillation in system oscillation, failure, oscillation according to sinusoidal comprehensive impedance
Identical criterion；
(4) judged according to oscillation identical criterion: when protection starts and meets oscillation identical criterion, that is, judging that system is sent out
Oscillation is given birth to, by protection blocking；When protection starts but is unsatisfactory for oscillation identical criterion, i.e. failure, protection act has occurred in judgement
In tripping.
Below by taking power system oscillation equivalent model shown in Fig. 4 as an example, illustrate a specific embodiment of the invention.
System equivalent potential at bus M and N is respectivelyWithRoute two sides system impedance is respectively ZMAnd ZN.Quilt
Protection circuit impedance is ZL, system whole impedance is defined as Z∑=ZM+ZL+ZN。For protected circuit impedance angle,For route M
Installation place is protected to measure electric current in side.
Calculate for simplifying the analysis, using it is assumed hereinafter that: 1) system impedance angle is identical, and system frequency becomes when disregarding oscillation
Change the influence to system impedance；2) side M and the side N are respectively the system sending end and receiving end before vibrating, and system two sides are electronic
Gesture amplitude is equal.
System two sides equivalence electromotive force meets when oscillation:
In formula, δ isWithBetween angle, physical significance be equivalent system generator rotor angle, within the scope of 0~360 ° with
Cycle of oscillation variation.
If the t=0 moment,WithBetween relationship as shown in figure 5, δ0For the t=0 momentWithBetween phase angle difference,
Have:
δ=δ0+Δωt (2)
The oscillating current of system are as follows:
The measurement current amplitude of the side M protection installation place can be obtained by formula (3) are as follows:
The amplitude cyclically-varying of installation place measurement electric current is protected it can be seen from formula (4), it is equivalent electronic in system two sides
When gesture phase angle is identical, it is 0 that amplitude, which reaches minimum value,；When in system two sides, equivalent electromotive force phase angle difference is 180 °, amplitude reaches
It is to maximum valueIt is possible that causing false protection.
As shown in Fig. 2, line segment OC is also simultaneously by δ angle bisection, therefore the amplitude of voltage of oscillation center are as follows:
In formula, UmThe amplitude of voltage is measured for protection installation place.
Voltage of oscillation center amplitude changes with the variation of system two sides equivalent electromotive force angle it can be seen from formula (5).
Meanwhile it can be obtained by the geometrical relationship in Fig. 2:
By formula (6) it is found that measurement voltage sinusoidal component meets:
In formula, ImThe amplitude of voltage is measured for protection installation place.
By formula (7) equation both sides simultaneously divided by the measurement current amplitude of protection installation place, and can be obtained with formula (4) simultaneous:
In definition (8) | Zmc| for sinusoidal measurement impedance, value be protection installation place measure voltage sinusoidal component amplitude with
Measure the ratio between current amplitude.Physical meaning representated by it: protect installation place to the modulus of impedance of oscillation center position by the side M
Value is not influenced by the variation of system equivalent electromotive force phase angle difference.
Similarly, for the sinusoidal measurement impedance of the side N protection installation place | Znc| also meet similar relational expression, it may be assumed that
Formula (8) is added and can be obtained with formula (9):
|Zmc|+|Znc|=| ZΣ-ZM-ZN|=| ZL| (10)
The sum of route two sides sine measurement impedance magnitude is sinusoidal comprehensive impedance in formula (10).It is found that when system is in
When oscillatory regime, sinusoidal comprehensive impedance is equal with the impedance magnitude of protected circuit.
Equivalent analysis model when electric system is through transition resistance generation three-phase shortcircuit is as shown in Figure 6.System is passed through in F point
When crossing resistance generation three-phase shortcircuit, the voltage equation of installation place is protected in the side M are as follows:
The sinusoidal component that voltage is measured in Fig. 3 is calculated, amplitude meets:
Formula (12) both members can be obtained divided by the measurement electric current of protection installation place simultaneously:
It can similarly obtain, the side N sine measures impedance are as follows:
Formula (13) and formula (14) simultaneous can be obtained:
By formula (16) abbreviation by way of with differenceization product are as follows:
From the above analysis as can be seen that when through transition resistance three-phase ground short circuit occurs for system, the comprehensive resistance of route sine
The anti-modulus value greater than line impedance.
By analyzing analysis above it is found that in system oscillation, route sine comprehensive impedance is equal to the positive sequence of protected circuit
Impedance magnitude；And when through transition resistance three-phase ground occurs for system, route sine comprehensive impedance is greater than the modulus value of line impedance.
In the case of comparison system oscillation and three-phase shortcircuit, the difference characteristic of route sine comprehensive impedance, oscillation identification that you can get it
Criterion:
||Zcom|-|ZL| | < KaRg (18)
When protection starting and satisfaction oscillation identical criterion, that is, judge that system is vibrated, by protection blocking；Work as protection
When starting but being unsatisfactory for oscillation identical criterion, i.e. failure has occurred in judgement, and protection act is in tripping.
Fig. 1 gives the oscillation identifying schemes based on sinusoidal comprehensive impedance.In order to reduce calculation amount and communication pressure, only exist
Starting oscillation identical criterion in the case that the distance protection of route two sides acts.This programme uses full-wave fourier algorithm to calculate first and protects
The measurement voltage and measurement electric current for protecting installation place judge that system is in oscillation or failure according to formula (18) after protection starting
State, and determine whether to answer latch-up protection according to judging result.
Finally it is noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, those skilled in the art should understand that: it is still
It is possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equally replaced
It changes；And these are modified or replaceed, the essence for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution
Mind and range.
Claims (3)
1. a kind of method of power system oscillation identifying system, which is characterized in that the power system oscillation identifying system includes
The information collection of sequential connection and processing module, sinusoidal impedance computation module and oscillation identification module；
The information collection and processing module judge that the protection of route two sides is for acquiring and calculating power-frequency voltage and power current
No movement starts sinusoidal impedance computation module if two sides protection act；
The sine impedance computation module is for calculating route sine comprehensive impedance；
The oscillation identification module is for judging whether system vibrates, if electric system is vibrated, the module is to guarantor
It protects equipment and sends block signal, otherwise send trip signal to protection equipment；
Use the method for the power system oscillation identifying system, comprising the following steps:
(1) define sinusoidal comprehensive impedance, the sine comprehensive impedance is that route two sides sine measures the sum of impedance magnitude, it is described just
String comprehensive impedance is defined as:
|Zcom|=| Zmc|+|Znc|
Wherein, | Zmc| impedance is measured for route M side sine, | Znc| impedance, the sinusoidal measurement resistance are measured for route N side sine
Anti-, value is that protection installation place measures the ratio between voltage sinusoidal component amplitude and measurement current amplitude；
(2) voltage phasor plane when analysis oscillation and voltage phasor plane when failure, voltage phase when analysis is vibrated
Plane is measured, when system is in oscillatory regime, sinusoidal comprehensive impedance is equal with the impedance magnitude of protected circuit；
(3) difference under fault condition again, construction oscillation identification in system oscillation, failure, oscillation according to sinusoidal comprehensive impedance
Criterion；
(4) judged according to oscillation identical criterion: when protection starts and meets oscillation identical criterion, that is, judging that system has occurred
Oscillation, by protection blocking；When protection starts but is unsatisfactory for oscillation identical criterion, i.e. failure has occurred in judgement, and protection act is in jump
Lock.
2. the method for power system oscillation identifying system as described in claim 1, it is characterised in that: step (2) analysis
Voltage phasor plane when failure, when through transition resistance three-phase ground short circuit occurs for system, route sine comprehensive impedance is greater than
The modulus value of line impedance.
3. the method for power system oscillation identifying system as described in claim 1, it is characterised in that: in the step (3)
Vibrate identical criterion are as follows:
||Zcom|-|ZL| | < KaRg
Wherein, protected circuit impedance is ZL, transition resistance distribution coefficient KaIt can adjust and be For protected circuit impedance angle, transition resistance RgCan be according to different voltage class, transition when choosing three-phase ground short circuit
The minimum value of resistance.
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| CN110350588B (en) * | 2019-07-30 | 2020-09-04 | 华北电力大学 | Dynamic energy stability evaluation method and system for doubly-fed fan grid-connected system |
| CN110726955A (en) * | 2019-11-07 | 2020-01-24 | 林心 | Electric power system oscillation and short-circuit fault identification method |
| CN110736939A (en) * | 2019-11-07 | 2020-01-31 | 林心 | dynamic identification system for oscillation center of power system |
| CN110763940A (en) * | 2019-11-07 | 2020-02-07 | 林心 | Method for estimating oscillation center of power system by using phasor diagram method |
| CN110752601A (en) * | 2019-11-07 | 2020-02-04 | 林心 | Electric power system oscillation identification and control system |
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