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CN108270226B - Method for rapidly recovering power supply - Google Patents

Method for rapidly recovering power supply Download PDF

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Publication number
CN108270226B
CN108270226B CN201810056103.8A CN201810056103A CN108270226B CN 108270226 B CN108270226 B CN 108270226B CN 201810056103 A CN201810056103 A CN 201810056103A CN 108270226 B CN108270226 B CN 108270226B
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Prior art keywords
power system
power
real
power supply
judging
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CN108270226A (en
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耿秋钰
李�昊
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a method for rapidly recovering power supply, which comprises the following steps: performing primary verification on the stability of the power system; performing secondary verification on the stability of the power system; and informing the operation operator that the power system is in an unstable state, cutting off an unstable part, and recovering stable power supply. The invention provides a method for rapidly recovering power supply, which can be used for rapidly judging the instability condition in time by a step-by-step judging mode, and screening by adopting a secondary model aiming at the condition of missed judgment possibly caused by the existence of a primary model, thereby not only ensuring the analysis speed, but also improving the analysis accuracy, further inhibiting the occurrence of system faults and rapidly recovering the stable power supply of a power system.

Description

Method for rapidly recovering power supply
Technical Field
The invention relates to a method for judging the stability of small disturbance of an electric power system, in particular to a method for quickly judging whether the electric power system is stable after the small disturbance occurs and quickly recovering power supply.
Background
Each node in the power system is in a dynamic process in real time, namely the load demand changes constantly, and further the power generation output is also changed constantly. When there is a sudden increase in a large load or a sudden loss of a large load, a sudden output failure, etc., the power system may oscillate and a system failure may occur. However, because a lot of intelligent devices are installed in the existing power system, and the scheduling implements strict monitoring management on the supply of electric energy, the possibility of large interference is greatly reduced, but small disturbances of the power system caused by the parallel connection and the off-grid of devices such as loads, distributed power supplies and the like cannot be avoided, because the small disturbances are usually caused by the load side, and the change of the load side cannot be directly controlled by the power department such as the scheduling and the like. Therefore, it is an important issue to research how to ensure that the power system can still be stable in case of small disturbances.
In the prior art, although a series of very complex models are adopted, the judgment of the small disturbance is time-consuming in such a processing mode, and if the system is already in a destabilization state after the small disturbance occurs, the time-consuming problem of the system is more and more serious like a snowball, and finally the system is completely crashed.
Disclosure of Invention
Therefore, aiming at the problems, the invention provides a method for rapidly recovering power supply, which can timely and rapidly judge the instability condition through a step-by-step judgment mode, and adopts a secondary model for screening aiming at the condition of missed judgment possibly caused by the existence of a primary model, thereby not only ensuring the analysis speed, but also improving the analysis accuracy and further inhibiting the occurrence of system faults.
In order to achieve the above object, the present invention provides a method for rapidly recovering power supply, comprising the following steps:
(1) performing primary verification on the stability of the power system;
(2) performing secondary verification on the stability of the power system;
(3) notifying an operating operator that the power system is in an unstable state;
(4) and cutting off the unstable part and recovering stable power supply.
The method for rapidly analyzing the small disturbance of the power system further meets the following conditions:
the step (1) comprises the following steps:
1) establishing a power system dynamic model:
Figure GDA0003129103880000021
wherein x is a first state variable comprising a power angle and an angular speed of the generator; y is a second state variable comprising node voltage amplitude and phase angle of network load flow calculation; p is a control variable comprising node load, controller gain and time constant; f is a nonlinear equation set for describing a generator rotor motion equation, an electromagnetic transient process and an excitation regulator dynamic process; g is a power flow algebraic equation set of the network;
2) establishing a linearization model:
Figure GDA0003129103880000022
wherein,
Figure GDA0003129103880000023
(x0,y0,p0) Is a given equilibrium point;
3) establishing a stable area:
Figure GDA0003129103880000024
wherein, S1 is the branch point where when p changes, there is a real eigenvalue from the origin through the imaginary axis, and the system appears; s2 is a bifurcation point where a pair of conjugate complex eigenvalues pass through the imaginary axis and the system appears when p changes; s3 is that when p is changed,
Figure GDA0003129103880000031
when irreversible, the bifurcation point that the system appears;
4) collecting power system data from a data collection and control system for primary stability verification:
and (3) substituting the real-time data of the power system into the established model, judging whether the real-time data are in a stable region, if so, implementing the step (2), otherwise, judging that the power system is unstable, and implementing the step (3).
The method for rapidly analyzing the small disturbance of the power system further meets the following conditions:
the step (2) comprises the following steps:
1) establishing a secondary verification model:
by
Figure GDA0003129103880000032
Obtain a system eigenvalue vector of
λ＝[λ1，λ2，…，λi，…，λn]
Wherein λ isi＝ai±jΩi，aiTo be a damping coefficient, omegaiIs the vibration frequency;
damping ratio of system
Figure GDA0003129103880000033
The quadratic stability region is defined as a set of system operating points that satisfy the following two conditions:
a. coefficient of attenuation ai≤-d1，d1Is a real number greater than 0;
b. system damping ratio xii≥d2，d2Is a real number greater than 0;
2) and (3) adopting the real-time data of the power system applied in the step (1) to be brought into the established secondary verification model, judging whether the real-time data is in a secondary stable area, if so, judging that the power system is stable, and otherwise, judging that the power system is unstable.
The method for rapidly analyzing the small disturbance of the power system further meets the following conditions:
the notification is realized in a warning mode, wherein the warning comprises a high-frequency audio frequency and a high-brightness lamp, and the high-frequency audio frequency and the high-brightness lamp stop sounding and light emitting when an operator presses a stop button.
The method for rapidly analyzing the small disturbance of the power system further meets the following conditions:
the notification is also sent to the mobile terminal of the operator in the form of information, the information comprises short messages and WeChat, the sending is realized through a wireless communication network, and the wireless communication network comprises wifi, 4G and 5G.
According to the invention, by setting a two-stage judgment mode, the instability condition can be judged rapidly in time, and secondary inspection is carried out aiming at the condition of missed judgment, so that the judgment accuracy is improved.
Detailed Description
A method of rapidly restoring power, comprising the steps of:
(1) performing primary verification on the stability of the power system;
1) establishing a power system dynamic model:
Figure GDA0003129103880000041
wherein x is a first state variable comprising a power angle and an angular speed of the generator; y is a second state variable comprising node voltage amplitude and phase angle of network load flow calculation; p is a control variable comprising node load, controller gain and time constant; f is a nonlinear equation set for describing a generator rotor motion equation, an electromagnetic transient process and an excitation regulator dynamic process; g is a power flow algebraic equation set of the network;
2) establishing a linearization model:
Figure GDA0003129103880000042
wherein,
Figure GDA0003129103880000043
(x0,y0,p0) Is a given equilibrium point;
3) establishing a stable area:
Figure GDA0003129103880000051
wherein, S1 is the branch point where when p changes, there is a real eigenvalue from the origin through the imaginary axis, and the system appears; s2 is a bifurcation point where a pair of conjugate complex eigenvalues pass through the imaginary axis and the system appears when p changes; s3 is that when p is changed,
Figure GDA0003129103880000052
when irreversible, the bifurcation point that the system appears;
4) collecting power system data from a data collection and control system for primary stability verification:
substituting the real-time data of the power system into the established model, judging whether the real-time data are in a stable area, if so, implementing the step (2), otherwise, judging that the power system is unstable, and implementing the step (3);
(2) performing secondary verification on the stability of the power system;
1) establishing a secondary verification model:
by
Figure GDA0003129103880000053
Obtain a system eigenvalue vector of
λ＝[λ1，λ2，…，λi，…，λn]
Wherein λ isi＝ai±jΩi，aiTo be a damping coefficient, omegaiIs the vibration frequency;
damping ratio of system
Figure GDA0003129103880000054
The quadratic stability region is defined as a set of system operating points that satisfy the following two conditions:
c. coefficient of attenuation ai≤-d1，d1Is a real number greater than 0;
d. system damping ratio xii≥d2，d2Is a real number greater than 0;
2) adopting real-time data of the power system applied in the step (1) to be brought into the established secondary verification model, judging whether the real-time data is in a secondary stable area, if so, judging that the power system is stable, otherwise, judging that the power system is unstable;
(3) informing an operating operator that an electric power system is in an unstable state, wherein the informing is realized in an alarm mode, and the alarm comprises a high-frequency audio and a high-brightness lamp which stop sounding and light emitting when the operator presses a stop button; the notification is also sent to the mobile terminal of the operator in the form of information, the information comprises short messages and WeChat, the sending is realized through a wireless communication network, and the wireless communication network comprises wifi, 4G and 5G.
It should be noted that the above-mentioned embodiments are provided for further detailed description of the present invention, and the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications and variations on the above-mentioned embodiments without departing from the scope of the present invention.

Claims (6)

1. A method for rapidly recovering power, comprising the steps of:
(1) performing primary verification on the stability of the power system;
(2) performing secondary verification on the stability of the power system;
(3) notifying an operating operator that the power system is in an unstable state;
(4) cutting off the unstable part and recovering stable power supply;
the step (1) comprises the following steps:
1) establishing a power system dynamic model:
Figure FDA0003129103870000011
wherein x is a first state variable comprising a power angle and an angular speed of the generator; y is a second state variable comprising node voltage amplitude and phase angle of network load flow calculation; p is a control variable comprising node load, controller gain and time constant; f is a nonlinear equation set for describing a generator rotor motion equation, an electromagnetic transient process and an excitation regulator dynamic process; g is a power flow algebraic equation set of the network;
2) establishing a linearization model:
Figure FDA0003129103870000012
wherein,
Figure FDA0003129103870000013
(x0,y0,p0) Is a given equilibrium point;
3) establishing a stable area:
Figure FDA0003129103870000014
wherein, S1 is the branch point where when p changes, there is a real eigenvalue from the origin through the imaginary axis, and the system appears; s2 is a bifurcation point where a pair of conjugate complex eigenvalues pass through the imaginary axis and the system appears when p changes; s3 is when p changesWhen the temperature of the water is higher than the set temperature,
Figure FDA0003129103870000021
when irreversible, the bifurcation point that the system appears;
4) collecting power system data from a data collection and control system for primary stability verification:
substituting the real-time data of the power system into the established model, judging whether the real-time data are in a stable area, if so, implementing the step (2), otherwise, judging that the power system is unstable, and implementing the step (3);
the step (2) comprises the following steps:
1) establishing a secondary verification model:
by
Figure FDA0003129103870000022
Obtain a system eigenvalue vector of
λ＝[λ1，λ2，…，λi，…，λn]
Wherein λ isi＝ai±jΩi，aiTo be a damping coefficient, omegaiIs the vibration frequency;
damping ratio of system
Figure FDA0003129103870000023
The quadratic stability region is defined as a set of system operating points that satisfy the following two conditions:
a. coefficient of attenuation ai≤-d1，d1Is a real number greater than 0;
b. system damping ratio xii≥d2，d2Is a real number greater than 0;
2) and (3) adopting the real-time data of the power system applied in the step (1) to be brought into the established secondary verification model, judging whether the real-time data is in a secondary stable area, if so, judging that the power system is stable, and otherwise, judging that the power system is unstable.
2. The method for rapidly recovering power supply of claim 1, wherein the step (3) comprises:
the notification is realized in a warning mode, wherein the warning comprises a high-frequency audio frequency and a high-brightness lamp, and the high-frequency audio frequency and the high-brightness lamp stop sounding and light emitting when an operator presses a stop button.
3. A method of rapidly restoring power to a power supply as claimed in claim 2, wherein the notification is also sent to the operator's mobile terminal in the form of a message.
4. The method of claim 3, wherein the information comprises a short message or a WeChat.
5. The method of claim 4, wherein the sending is performed via a wireless communication network.
6. The method according to claim 5, wherein the wireless communication network comprises wifi, 4G, 5G.
CN201810056103.8A 2018-01-20 2018-01-20 Method for rapidly recovering power supply Expired - Fee Related CN108270226B (en)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
US7786617B2 (en) * 2004-09-28 2010-08-31 American Power Conversion Corporation System and method for allocating power to loads
CN103368175A (en) * 2013-07-05 2013-10-23 上海交通大学 Online evaluation method of electric power system dynamic stability

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101291061B (en) * 2008-05-16 2010-04-21 南京南瑞继保电气有限公司 Status estimating method for dynamic process of electrical power system
CN103746376B (en) * 2014-01-21 2015-09-09 重庆大学 A dynamic power supply restoration method for distribution network based on load curve
CN104821582B (en) * 2015-05-21 2017-03-01 广东电网有限责任公司惠州供电局 Turned for optimization method and its system based on the distribution network load of nonlinear integer programming
CN107346886B (en) * 2016-12-06 2020-02-04 广东电网有限责任公司云浮供电局 Power distribution network load transfer method and system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7786617B2 (en) * 2004-09-28 2010-08-31 American Power Conversion Corporation System and method for allocating power to loads
CN103368175A (en) * 2013-07-05 2013-10-23 上海交通大学 Online evaluation method of electric power system dynamic stability

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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