CN102946109A - Wide area damping control system of electric system based on event trigger - Google Patents

Wide area damping control system of electric system based on event trigger Download PDF

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Publication number
CN102946109A
CN102946109A CN2012104087522A CN201210408752A CN102946109A CN 102946109 A CN102946109 A CN 102946109A CN 2012104087522 A CN2012104087522 A CN 2012104087522A CN 201210408752 A CN201210408752 A CN 201210408752A CN 102946109 A CN102946109 A CN 102946109A
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wide area
control
phasor data
additional excitation
electric
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CN102946109B (en
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岳东
张赟宁
胡松林
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses

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Abstract

The invention discloses a wide area damping control system of an electric system based on an event trigger. The system comprises synchrophasor measurement sub stations for collecting synchrophasor data of motors, a wide area phasor data centralizing unit for sending the synchrophasor data of the motors in a same time section to an event generating unit, the event generating unit, a wide area damping control central station, control execution sub stations and electric control devices, wherein the event generating unit is used for judging whether the event trigger standard is met or not, if so, sending the synchrophasor data to a wide area damping control central station, or, not sending; the wide area damping control central station is for updating additional excitation control input values of the motors when the synchrophasor data are received; the control execution sub stations are used for receiving the additional excitation control input values from the wide area control central station and forwarding the additional excitation control input values to the electric control devices, as well as maintaining the additional excitation control input values when updated additional excitation control input values are not received; the electric control devices control power oscillation according to the additional excitation control input values. The wide area damping control system of the electric system based on the event trigger can inhibit power oscillation among grid areas, ensures stable operation of the electric system, and effectively reduces the transmission quantity of information in an electric communication network.

Description

Wide area damp of electrical power system control system based on Event triggered
Technical field
The invention belongs to electrical power system wide-area control technology field, be specifically related to a kind of power system damping control system based on Event triggered.
Background technology
The low-frequency oscillation of electric power system, especially interregional low-frequency oscillation makes the safe operation of interconnected electric power system face huge challenge.The power system stabilizer, PSS of traditional inhibition low-frequency oscillation (Power System Stabilizer, PSS) is used local signal, and is bad to the inter-area oscillation mode inhibition.Electrical power system wide-area measuring system (WAMS-Wide Area Measurement System), application of synchronized phasor unit (Phasor Measurement Unit, PMU) measure in real time the state of the whole network, realize that wide area control becomes possibility so that the good remote signal of ornamental is used in damping of power systems control.
Application based on WAMS is controlled except wide area, also comprises the aspects such as accident detection and data record, state estimation.The construction cost that is limited to WAMS can not be set up separately independently dedicated communications network for each function, usually utilizes existing communication network to realize many application communications channels share.Along with the continuous expansion of power grid construction scale, what the researchs such as digital power grid, digital transformer substation were used deepens continuously, and will have magnanimity information to transmit by power telecom network, brings huge communication pressure, affects the reliability of network service.On the other hand, by the control strategy of system's worst case design cycle property, cause the transmission of bulk redundancy information in the wide area preventive control.
Therefore, be necessary the synchronized phasor signal that PMU collects is carried out preliminary treatment, when improving stability of power system, reduce the redundant information transmission, take full advantage of the bandwidth of sharing power telecom network.
Summary of the invention
The objective of the invention is when utilizing the wide area signal electric power system to be carried out damping control, the transmission quantity of minimizing information on communication network, effectively utilize the bandwidth of electric power common share communication net, the spy provides a kind of wide area damp of electrical power system control system based on Event triggered, improve the stability of electric power system, and effectively reduce the transmission quantity of information on communication network.
To achieve these goals, the present invention adopts following technical scheme:
A kind of wide area damp of electrical power system control system based on Event triggered comprises a plurality of synchronous phasor measurements substation, a wide area phasor data centralization unit, an event generation unit, wide area damp control centre station, a plurality of control execution substation and an a plurality of electric control appliance;
Carry out point-to-point private line access by optical-fibre channel between synchronous phasor measurement substation and the wide area phasor data centralization unit; Between wide area phasor data centralization unit and the wide area damp control centre station, and be connected by electric power common share communication net between wide area damp control centre station and each control execution substation; A plurality of controls are carried out the substation and are connected with the local area network (LAN) of a plurality of electric control appliances by factory's station level respectively;
A plurality of synchronous phasor measurements substation is used for gathering the synchronized phasor data of each motor and sending wide area phasor data centralization unit to;
Wide area phasor data centralization unit, be used for each motor at one time the synchronized phasor data of section send to the event generation unit;
The event generation unit, the synchronized phasor data that are used for receiving according to current time are calculated the Event triggered functional value, if this functional value, then is sent to these synchronized phasor data wide area damp control centre station greater than zero, otherwise, do not send this synchronized phasor data; Described Event triggered function definition is: the functional value of the amplitude of variation between the synchronized phasor data that the synchronized phasor data of calculating reflection current time and last time are sent to wide area damp control centre station, this value is asked poor with the threshold value relevant with the synchronized phasor data of current time;
Wide area damp control centre station is used for when current time receives the synchronized phasor data that sent by the event generation unit, according to the additional excitation control input value of this each motor of synchronized phasor Data Update, and sends it to corresponding control execution substation;
The substation is carried out in control, when it receives the additional excitation control input value of wide area damp control centre station transmission, this input value is forwarded to corresponding electric control appliance; When it does not receive the additional excitation control input value, keep the current additional excitation control input value of electric control appliance constant;
Electric control appliance is used for the excitation system according to additional excitation control input value control synchronous generator, and the power oscillation phenomenon is controlled.
Further, wide area phasor data centralization unit and Event triggered unit adhere to two logical blocks separately, physically become one.
Further, the additional excitation control input value of described motor obtains according to Liapunov (Lyapunov) Theory of Stability calculated off-line.
Described Event triggered function is specially g (x (r kH), x (r kH+ih))=|| x (r kH)-x (r kH+ih) ||-σ || x (r kH+ih) ‖, wherein, x (r kH) be r kThe synchronized phasor data that h gathers constantly, this signal is sent to wide area damp control centre station by the event generation unit; X (r kH+ih) be current time (r kH+ih) the synchronized phasor data that gather; H is the sampling period of synchronous phasor measurement substation, and σ is the bounded arithmetic number, r kWith i be natural number, || || European norm is asked in expression.
Technique effect of the present invention is embodied in:
Wide area damp of electrical power system control system based on Event triggered of the present invention can utilize the wide area signal to the ornamental of interval vibration, the interval vibration of effective damping, the stability of raising power system operation; Simultaneously, because the existence of event generation unit, " necessity " information that only will guarantee the stability of a system is sent to wide area control centre station, reduced thus the transmission quantity of synchronized phasor signal between between event generation unit and wide area control centre station and wide area control centre station and control execution substation, can take full advantage of electric power common share communication bandwidth of network, reduce the input cost of electric power common share communication network in the WAMS system.
Description of drawings
Fig. 1 is system of the present invention theory of constitution block diagram;
Fig. 2 is system control method flow chart of the present invention.
Embodiment
A kind of wide area damp of electrical power system control system based on Event triggered as described in Figure 1 comprises a plurality of synchronous phasor measurements substation, wide area phasor data centralization unit, event generation unit, wide area damp control centre station, a plurality of control execution substation and a plurality of electric control appliance.
Wherein, in order to ensure the reliability service of WAMS system difference in functionality, between synchronous phasor measurement substation and the wide area phasor data centralization unit by point-to-point optical fiber private line access.In the present embodiment, the transmission rate of point-to-point optical fiber special line is 2M/s, certainly can also select to have the more network of high transfer rate.Wide area phasor data centralization unit and event generation unit become one, again by electric power common share communication network connection wide area damp control centre station; The substation is carried out by a plurality of controls of electric power common share communication network connection in wide area damp control centre station; Respectively control is carried out the substation electric control appliance corresponding with it by the local area network (LAN) connection of factory's station level.
A plurality of synchronous phasor measurements substation is used for gathering each motor synchronized phasor data; The collect signal of motor synchronizing phasor measurement substation of wide area phasor data centralization unit, with each motor at one time the synchronized phasor data of section send the event generation unit to; The event generation unit is pressed the running status of current power system, carries out signal screening according to the Event triggered criterion, and the signal that satisfies the Event triggered criterion is sent to wide area damp control centre station; Wide area damp control centre station receives by the signal after the screening of event generation unit, according to the additional excitation control signal input value of this each motor of calculated signals, and sends it to corresponding control execution substation; Control is carried out the substation additional excitation control input value that receives is forwarded to electric control appliance, and the additional excitation control input value of electric control appliance is remained unchanged; Electric control appliance is controlled the power oscillation phenomenon by the additional excitation control input value that receives.
Set up the Event triggered criterion in the event generation unit, carry out signal screening according to the Event triggered criterion, the signal that satisfies the Event triggered criterion is sent to wide area damp control centre station.The basic fundamental thought of Event triggered criterion is: calculating can reflect the synchronized phasor signal of current time and the functional value of the amplitude of variation between the last synchronized phasor signal that is sent to wide area damp control centre station, and will be worth with and the threshold value of the synchronized phasor signal correction of current time ask relatively poor, if difference is greater than zero, think that then trigger " event ", the synchronized phasor signal of current time will be sent to wide area damp control centre station; Otherwise above-mentioned signal will can not be sent out.In the present embodiment definition triggers function:
g(x(r kh),x(r kh+ih))＝‖x(r kh)-x(r kh+ih)‖-σ‖x(r kh+ih)‖ (1)
Wherein: g (x (r kH), x (r kH+ih)) for being sent to the synchronized phasor signal x (r that wide area damp control centre stands with the last time kH) and the current time (r that collects of event generation unit kH+ih) signal x (r kH+ih) relevant triggering function; X (r kH), k=0,1,2 ..., ∞ is r kThe synchronized phasor signal that h collects constantly, this signal is sent to wide area damp control centre station by the event generation unit; H is the sampling period of synchronous phasor measurement substation, and σ is the bounded arithmetic number, || || European norm is asked in expression.
The Event triggered function can also be defined as except the form of the present embodiment definition:
g(x(r kh),x(r kh+ih))＝(x(r kh)-x(r kh+ih) T)Ω(x(r kh)-x(r kh+ih))-σx T(r kh+ih)Ωx(r kh+ih) (2)
Wherein, Ω is the positive definite weighting matrix with suitable dimension.No matter any form is as long as abide by the basic fundamental thought of aforementioned Event triggered criterion.
In the present embodiment, if trigger function g (x (r kH), x (r kH+ih))≤0, then think do not have to occur " event ", the synchronized phasor signal x (r that the event generation unit is collected kH+ih) will can not be sent to wide area damp control centre; If trigger function g (x (r kH), x (r kH+ih))＞0, then think the synchronized phasor signal x (r that occured " event ", current event generation unit are collected kH+ih) will be sent to wide area damp control centre station, in order to upgrade the additional excitation control signal.
In the present embodiment, the parameter σ that triggers function can obtain its span by Liapunov (Lyapunov) stability analysis theory, and in conjunction with the σ value situation that affects of time-domain response is determined its value.
Wide area damp control centre station receives the real time data information from the event generation unit, utilize the preventative wide area damp control law that calculates according to electric power system inearized model and linear control theory in advance, real time data information is carried out the calculating of online additional excitation signal.
In the present embodiment, electric control appliance is power system stabilizer, PSS.
As shown in Figure 2, control flow step of the present invention comprises:
A. obtain its inearized model by the electric power system typical operation modes, consider to adopt the wide area feedback signal to carry out numerically controlled feature in the wide area control, the inearized model equivalence that obtains is converted to the form of time-lag system functional differential equation;
B. use the Lyapunov-Krasovskii Functional Approach, determine to trigger the preventative wide area damp control law in function parameter and the wide area damp control centre station;
C. synchronous phasor measurement substation Real-time Collection electrical network multidate information;
D. wide area phasor signal centralized unit receives the sampled signal from the synchronous phasor measurement substation, and in the event generation unit, by the triggering rule of setting, screening is sent to wide area damp control centre station to the information of preventative damping control " necessity ";
E. wide area damp control centre stands and calculates the additional excitation control signal by the control law of setting, and sends it to control execution substation;
F. each control is carried out substation with the be added to additional input end of electric control appliance of additional excitation control signal, and the power oscillation phenomenon is regulated.
Calculating among above-mentioned steps a and the b all is that off-line carries out, and can not increase the computation burden based on the wide area damp of electrical power system control system of Event triggered.
Press the event generation unit of the preventative damping control stability design of wide area of the present invention to the screening of synchronized phasor signal, can not affect wide area phasor data centralization unit and send necessary informations to other functions of WAMS.
Those skilled in the art will readily understand; the above only is preferred embodiment of the present invention; not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. the wide area damp of electrical power system control system based on Event triggered comprises a plurality of synchronous phasor measurements substation, a wide area phasor data centralization unit, an event generation unit, wide area damp control centre station, a plurality of control execution substation and an a plurality of electric control appliance;
Carry out point-to-point private line access by optical-fibre channel between synchronous phasor measurement substation and the wide area phasor data centralization unit; Between wide area phasor data centralization unit and the wide area damp control centre station, and be connected by electric power common share communication net between wide area damp control centre station and each control execution substation; A plurality of controls are carried out the substation and are connected with the local area network (LAN) of a plurality of electric control appliances by factory's station level respectively;
A plurality of synchronous phasor measurements substation is used for gathering the synchronized phasor data of each motor and sending wide area phasor data centralization unit to;
Wide area phasor data centralization unit, be used for each motor at one time the synchronized phasor data of section send to the event generation unit;
The event generation unit, the synchronized phasor data that are used for receiving according to current time are calculated the Event triggered functional value, if this functional value, then is sent to these synchronized phasor data wide area damp control centre station greater than zero, otherwise, do not send this synchronized phasor data; Described Event triggered function definition is: the functional value of the amplitude of variation between the synchronized phasor data that the synchronized phasor data of calculating reflection current time and last time are sent to wide area damp control centre station, this value is asked poor with the threshold value relevant with the synchronized phasor data of current time;
Wide area damp control centre station is used for when current time receives the synchronized phasor data that sent by the event generation unit, according to the additional excitation control input value of this each motor of synchronized phasor Data Update, and sends it to corresponding control execution substation;
The substation is carried out in control, when it receives the additional excitation control input value of wide area damp control centre station transmission, this input value is forwarded to corresponding electric control appliance; When it does not receive the additional excitation control input value, keep the current additional excitation control input value of electric control appliance constant;
Electric control appliance is used for the excitation system according to additional excitation control input value control synchronous generator, and the power oscillation phenomenon is controlled.
2. the wide area damp of electrical power system control system based on Event triggered according to claim 1 is characterized in that, wide area phasor data centralization unit and Event triggered unit adhere to two logical blocks separately, physically become one.
3. the wide area damp of electrical power system control system based on Event triggered according to claim 1 is characterized in that, the additional excitation control input value of described motor obtains according to the Lyapunov stability theory calculated off-line.
CN201210408752.2A 2012-10-24 2012-10-24 Wide area damping control system of electric system based on event trigger Expired - Fee Related CN102946109B (en)

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CN106936142A (en) * 2017-05-18 2017-07-07 安徽大学 Power System Reactive Power adjusts event trigger control method and system
CN107069755A (en) * 2017-01-23 2017-08-18 南京邮电大学 A kind of distributed secondary voltage control method of the micro-capacitance sensor based on event trigger mechanism
CN108448576A (en) * 2018-04-09 2018-08-24 南京邮电大学 Multi-machine power system wide area damper control method under elastic event trigger mechanism

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Publication number Priority date Publication date Assignee Title
CN107069755A (en) * 2017-01-23 2017-08-18 南京邮电大学 A kind of distributed secondary voltage control method of the micro-capacitance sensor based on event trigger mechanism
CN107069755B (en) * 2017-01-23 2018-11-09 南京邮电大学 A kind of micro-capacitance sensor distribution secondary voltage control method based on event trigger mechanism
CN106936142A (en) * 2017-05-18 2017-07-07 安徽大学 Power System Reactive Power adjusts event trigger control method and system
CN106936142B (en) * 2017-05-18 2019-05-24 安徽大学 Power System Reactive Power adjusts event trigger control method and system
CN108448576A (en) * 2018-04-09 2018-08-24 南京邮电大学 Multi-machine power system wide area damper control method under elastic event trigger mechanism

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