CN102946109B - 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
CN102946109B
CN102946109B CN201210408752.2A CN201210408752A CN102946109B CN 102946109 B CN102946109 B CN 102946109B CN 201210408752 A CN201210408752 A CN 201210408752A CN 102946109 B CN102946109 B CN 102946109B
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wide area
control
phasor data
additional excitation
electric
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CN102946109A (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

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) application local signal, bad to 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, make the damping of electric power system control the good remote signal of application ornamental and realize wide area and control and become possibility.
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 set up separately independently dedicated communications network for each function, conventionally utilizes existing communication network to realize many application communications channels share.Along with the continuous expansion of power grid construction scale, deepening continuously of the research application such as digital power grid, digital transformer substation, will have magnanimity information to transmit by power telecom network, brings huge communication pressure, affects the reliability of network service.On the other hand, in wide area preventive control, by the control strategy of system worst case design cycle property, cause the transmission of bulk redundancy information.
Therefore, be necessary that the synchronized phasor signal that PMU is collected carries out preliminary treatment, when improving stability of power system, reduce redundant information transmission, make full use of the bandwidth of sharing power telecom network.
Summary of the invention
The object of the invention is when utilizing wide area signal to carry out damping control to electric power system, the transmission quantity of minimizing information on communication network, effectively utilize the bandwidth of electric power common share communication net, 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 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, event generation unit, Yi Ge wide area damp control centre station, a plurality of control execution substation and an a plurality of electric control appliance;
Between synchronous phasor measurement substation and wide area phasor data centralization unit, by optical-fibre channel, carry out point-to-point private line access; Between wide area phasor data centralization unit and wide area damp control centre station, and wide area damp control centre station is controlled between execution substation and is connected by electric power common share communication net with each; A plurality of control is carried out substation and is connected with the local area network (LAN) of a plurality of electric control appliances by plant stand level respectively;
A plurality of synchronous phasor measurements substation, for gathering the synchronized phasor data of each motor and sending wide area phasor data centralization unit to;
Wide area phasor data centralization unit, for by each motor at one time the synchronized phasor data of section send to event generation unit;
Event generation unit, calculates Event triggered functional value for the synchronized phasor data that receive according to current time, if this functional value is greater than zero, these synchronized phasor data is sent to wide area damp control centre station, 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 of calculating reflection current time and the last synchronized phasor data that are sent to wide area damp control centre station, the threshold value that this value is relevant to synchronized phasor data with current time is asked to poor;
Wide area damp control centre station, when receiving the synchronized phasor data that sent by event generation unit at current time, according to the additional excitation control input value of this each motor of synchronized phasor Data Update, and sends it to corresponding control and carries out substation;
Control and carry out substation, 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 additional excitation control input value, keep the current additional excitation control input value of electric control appliance constant;
Electric control appliance, for control the excitation system of synchronous generator according to additional excitation control input value, controls power oscillation phenomenon.
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 by event generation unit and stands; 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 bounded arithmetic number, r kwith i be natural number, || || represent to ask European norm.
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 ornamental of wide area signal to interval vibration, the interval vibration of effective damping, the stability of raising power system operation; Simultaneously, because the existence of event generation unit, only " necessity " information that guarantees 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 make full use of the bandwidth of electric power common share communication network, reduce the input cost of electric power common share communication network in WAMS system.
Accompanying drawing explanation
Fig. 1 is system theory of constitution block diagram of the present invention;
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 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, then stand by electric power common share communication network connection wide area damp control centre; Wide area damp control centre station connects a plurality of control by electric power common share communication network and carries out substation; Each control to be carried out the local area network (LAN) of the substation electric control appliance corresponding with it by plant stand level and connects.
A plurality of synchronous phasor measurements substation is used for gathering each motor synchronized phasor data; The signal from synchronous phasor measurement substation is collected in wide area phasor data centralization unit, by each motor at one time the synchronized phasor data of section send event generation unit to; Event generation unit, by the running status of current power system, carries out signal screening according to Event triggered criterion, and the signal that meets 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 execution substation the additional excitation control input value receiving is forwarded to electric control appliance, when not receiving additional excitation control input value, make the additional excitation control input value of electric control appliance remain unchanged; Electric control appliance is controlled power oscillation phenomenon by the additional excitation control input value receiving.
In event generation unit, set up Event triggered criterion, according to Event triggered criterion, carry out signal screening, the signal that meets 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 by this value 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 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.Definition in the present embodiment 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 last time synchronized phasor signal x (r that wide area damp control centre stands 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 by event generation unit and stands; H is the sampling period of synchronous phasor measurement substation, and σ is bounded arithmetic number, || || represent to ask European norm.
Event triggered function, except the form of the present embodiment definition, can also be defined as:
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, needs only the basic fundamental thought in accordance with aforementioned Event triggered criterion.
In the present embodiment, if trigger function g (x (r kh), x (r kh+ih))≤0, thinks " event ", the synchronized phasor signal x (r that event generation unit is collected does not occur 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, thinks the synchronized phasor signal x (r that occurred " event ", current event generation unit are collected kh+ih) will be sent to wide area damp control centre station, in order to upgrade 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 σ value, the situation that affects of time-domain response is determined to its value.
Wide area damp control centre station receives the real time data information from event generation unit, utilize the preventative wide area damp control law calculating according to electric power system inearized model and linear control theory in advance, real time data information is carried out to 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. by electric power system typical operation modes, obtain its inearized model, consider that wide area adopts wide area feedback signal to carry out numerically controlled feature in controlling, and is converted to the inearized model equivalence obtaining the form of time-lag system functional differential equation;
B. apply Lyapunov-Krasovskii Functional Approach, determine the preventative wide area damp control law triggering in function parameter and 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 synchronous phasor measurement substation, and in event generation unit, by the triggering rule of setting, the information that screening is controlled " necessity " to preventative damping is sent to wide area damp control centre station;
E. wide area damp control centre stands and calculates additional excitation control signal by the control law of setting, and sends it to control execution substation;
F. each control to carry out substation by the be added to additional input end of electric control appliance of additional excitation control signal, and power oscillation phenomenon is regulated.
Calculating in above-mentioned steps a and b is all that off-line carries out, and can not increase the computation burden of the wide area damp of electrical power system control system based on Event triggered.
Screening by the event generation unit of the preventative damping control stability design of wide area of the present invention to synchronized phasor signal, can not affect wide area phasor data centralization unit and send necessary information to other functions of WAMS.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit 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., within all should being included in 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, event generation unit, Yi Ge wide area damp control centre station, a plurality of control execution substation and an a plurality of electric control appliance;
Between synchronous phasor measurement substation and wide area phasor data centralization unit, by optical-fibre channel, carry out point-to-point private line access; Between wide area phasor data centralization unit and wide area damp control centre station, and wide area damp control centre station is controlled between execution substation and is connected by electric power common share communication net with each; A plurality of control is carried out substation and is connected with the local area network (LAN) of a plurality of electric control appliances by plant stand level respectively;
A plurality of synchronous phasor measurements substation, for gathering the synchronized phasor data of each motor and sending wide area phasor data centralization unit to;
Wide area phasor data centralization unit, for by each motor at one time the synchronized phasor data of section send to event generation unit;
Event generation unit, calculates Event triggered functional value for the synchronized phasor data that receive according to current time, if this functional value is greater than zero, these synchronized phasor data is sent to wide area damp control centre station, 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 of calculating reflection current time and the last synchronized phasor data that are sent to wide area damp control centre station, and ask difference to obtain Event triggered functional value the threshold value that this value is relevant to synchronized phasor data with current time;
Wide area damp control centre station, when receiving the synchronized phasor data that sent by event generation unit at current time, according to the additional excitation control input value of this each motor of synchronized phasor Data Update, and sends it to corresponding control and carries out substation;
Control and carry out substation, when it receives the additional excitation control input value of wide area damp control centre station transmission, additional excitation control input value is forwarded to corresponding electric control appliance; When it does not receive additional excitation control input value, keep the current additional excitation control input value of electric control appliance constant;
Electric control appliance, for control the excitation system of motor according to additional excitation control input value, controls power oscillation phenomenon.
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 Liapunov (Lyapunov) Theory of Stability 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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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
CN106936142B (en) * 2017-05-18 2019-05-24 安徽大学 Power System Reactive Power adjusts event trigger control method and system
CN108448576B (en) * 2018-04-09 2021-06-01 南京邮电大学 Multi-machine power system wide-area damping control method under elastic event trigger mechanism

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CN102185326B (en) * 2011-05-17 2014-01-08 华北电力大学 Method for designing wide area damping control system with robustness

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