CN1306677C - Layered distributed monitoring system with chain type static synchronous compensator - Google Patents
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Abstract
The present invention belongs to the technical field of flexible alternate current transmission and distribution, which relates to a layered distributed monitoring system of a chain type static synchronous compensator. The present invention comprises a dispatching layer, a station control layer and an interlayer, wherein the dispatching layer is composed of an upper-level dispatching computer and a telecontrol workstation computer; the station control layer is composed a central monitor computer network server, and the interlayer is composed of multiple CAN nodes which are connected through a CAN bus; each CAN node comprises a microcontroller, a data memory, a program memory, a number dialing device, a digital display, a direct current power source, an analogue-to-digital converter, a digital-to-analog converter, a digital input and output, a serial port, a CAN controller and a CAN optical fiber interface circuit, wherein the data memory, the program memory, the number dialing device, the digital display, the direct current power source, the analogue-to-digital converter, the digital-to-analog converter, the digital input and output, the serial port and the CAN controller are all connected with the microcontroller. The present invention can judge the working state and the fault state of chain type STATCOM according to the monitored working conditions of main circuit devices, and can definite various states of the chain type STATCOM and can strictly monitor all working states in real time. The present invention is applied to STATCOM systems with large capacity.
Description
Technical field the invention belongs to flexible AC power transmission and distribution technical field, particularly is used for the monitoring technology of chain static synchronous compensator (STATCOM) system.
Background technology typical distribution formula control system is made up of field device interface and controller and communication equipment, and the information of equipment room is interconnected, the carrier that needs a kind of information to transmit.And field bus FB (Field Bus) technology is to adopt communication line all devices is together in series (being serial communication mode), each device control cell participates in information exchange by identification code and transmits with order, the various troubles that intrinsic property caused such as avoided the star wiring amount of Distributed Control System DCS (Discreted Control System) mode big, communication distance is short.We can say that field bus technique is an important milestone of automatic field technological progress in the successful Application in industrial process control field.
Controller local area network (Controller Area Network is hereinafter to be referred as CAN), because its data communication has high-performance, high reliability, the application of CAN bus in modern industry is more and more wider.Its main feature is as follows: 1) CAN is the work of many master modes, on the network arbitrary node all can be at any time on one's own initiative on network other nodes send information, and be regardless of the principal and subordinate, communication mode is flexible, and need not the station address nodal information.Utilize these characteristics can constitute the multi-computer back-up system easily.2) nodal information on the CAN network is divided into different priority, and demarcates with identifier ID, and its value is more little, and priority is high more, can satisfy different real-time requirements, and the data of high priority can obtain transmission at most in 134us.3) CAN adopts non-destructive bus arbitration technology, when a plurality of nodes during simultaneously to bus sending information, the node that priority is lower can withdraw from transmission on one's own initiative, and the node of limit priority can continue to send data insusceptibly, thereby has saved the bus collision arbitration time greatly.Especially the network paralysis situation can not appear yet under the very heavy situation of offered load.4) CAN only need the packet filtering ripple can realize point-to-point, a bit to multiple spot.5) CAN bus communication form adopts short frame format, and every frame byte number mostly is 8 most, can satisfy the general requirement of control command, operating state and test data in the common industrial circle.Simultaneously, it is long that 8 bytes also can not take bus time, thereby guaranteed the real-time of communication.6) the integrated physical layer and the data link layer functions of CAN agreement in the CAN bus communication interface can be finished the framing of communication data is handled, and comprises multinomial work such as a position filling, data block coding, cyclic redundancy check, priority discrimination.The Frame of CAN packets of information is to carry data by the frame of transmitter to receiver, is one of 4 kinds of frame formats of CAN, and this frame format is respectively Frame, remote frame, make mistakes frame and overload frame.The primary structure of Frame has: (1) frame is initial: flag data frame initial, it is made of single " dominance " position, sends when bus is idle, can produce synchronous effect on bus; (2) arbitration field: being made up of 11 bit identifiers and long-range transmission request position, is to show the bit representation Frame, and cryptotope is represented remote frame.Identifier order from high to low sends, and preceding 7 can not be recessive position entirely, and identifier is used to provide about transmitting the priority information of message and bus access, and its numerical value is more little, represents that priority is high more, preferentially sends when clashing; (3) controlling filed: constitute by 6, preceding 2 are dominance for keeping the position, and back 4 be the data length sign indicating number, represents the byte number of data in the data fields, must change in 0～4 scope; (4) data fields: form by being sent out data, number is 1～8 byte that determines in the controlling filed, and the highest order of first byte at first is sent out; (5) CRC field: comprise that 15 of CRC sequences and CRC define symbol (1 cryptotope), are used for frame check; (6) reply the field: by replying the gap and replying to define to accord with and form totally two; (7) frame end: form by 7 recessive positions, do not have the position during this and fill.
In the practical application of CAN bus, main website is responsible for whole network.It sends various control commands to slave station, and slave station is operated according to the order from main website.Any one slave station exchange data information can be selected by main website, and arbitrary slave station is in a single day selected, promptly can receive the information from main website, also can be according to the order of slave station to main website loopback information.When a certain slave station breaks down, can initiatively send for information about to slave station.When arbitrary slave station and main website exchange message, must be with tributary address information.
The flexible AC that occurs the nineties is defeated/and the distribution system technology also claims FACTS/DFACTS (Flexible ACTransmission System/Distribution Flexible AC Transmission System) technology, is to use a kind of new and high technology that modern power electronics technology, microprocessing, modern communication technology and modern control technology are changed, controlled electric energy.FACTS transforms transmission system with power electronic technology, STATCOM (StaticSynchronous Compensator is hereinafter to be referred as STATCOM) is the representative of its core technology, STATCOM is pollution-free, static reactive generating device, can be installed in load center, when voltage is low, characteristic is hard, and compensation effect is good; Inertia is little, the response time fast (about 30 milliseconds); Can regulate the output reactive power positive and negative, smoothly, apace, solve the problem of idle difficulty of transportation, satisfy the needs of electric power system.Chain type STATCOM (Cascade STATCOM) is the concrete application of the FACTS of flexible transmission system technology in electric power system, is the forward position research topic in current International Power field.Research and development STATCOM has important in theory meaning and practical value, and this technology has the material impact of the property changed to the development utilization of future source of energy.
Chain type STATCOM mainly partly is made up of dc bus capacitor, voltage source inverter etc., and chain type STATCOM inserts network system by connecting transformer or connecting reactor.The voltage that inverter output amplitude and phase place are adjustable by this amplitude of real time altering and phase place, can change the reactive current that STATCOM absorbs or sends, thereby realizes dynamic passive compensation.STATCOM can equivalence be amplitude and phase place all controllable, with the alternating-current voltage source of electrical network same frequency.For desirable STATCOM (no power waste), only change output voltage amplitude and be the idle exchange of scalable itself and network system: when output voltage during less than system voltage, STATCOM absorbs leading reactive power; Otherwise STATCOM sends leading reactive power.Performance is more excellent under the situations such as in a word, the STATCOM output current does not rely on voltage, responds rapid more, dynamic voltage compensation better effects if, and is particularly unusual.In addition, also lossy little, the advantage such as floor space is little, reliability is high, antijamming capability is strong of STATCOM, performance is superior to other traditional reactive power compensators comprehensively.Along with further developing of power electronic technology, chain type STATCOM will obtain significant progress.
The remarkable part that FACTS or DFACTS device are different from traditional electrical network system element device is the rapidity (microsecond level) that responds, the accuracy and jamproof relative fragility of control.Chain type STATCOM is as a transformation of electrical energy device, its running status often changes with the variation of load, and device is in case abnormal conditions occur, need current state is switched to the state of emergency immediately to guarantee the safety of chain type STATCOM as far as possible, promptly want the monitoring in the supervisory control system of chain type STATCOM to be closely linked with the response speed of raising supervisory control system with control.
The relevant STATCOM supervisory control system of reporting on the science abstract has only one at present, as described in following three pieces of documents: document 1: Xie Xiaorong, Tang Yiliang, Han Ying's tongued bell, Shi Jun, Ying Yu, the operational monitoring of ± 20 MVar STATCOM and fault diagnosis system, Automation of Electric Systems, the 23rd volume, the 12nd phase, in June, 1999, pp25-28; Document 2: Xie Xiaorong, Liu Wenhua, Wang Zhonghong, the intelligent alarm of STATCOM is handled and fault diagnosis system, electric power network technique, the 23rd volume, the 8th phase, in August, 1999, pp35-38; Document 3:Xiaorong Xie, Wenhua Liu, Hua Qian, Yingduo Han, Real-time Supervision for STATCOM Installations, IEEE ComputerApplication in Power, April 2000, pp43-47. above-mentioned document 1,2,3 described STATCOM supervisory control systems are: 1994, China Henan Province power office and department of electrical engineering of Tsing-Hua University develop cooperatively ± operational monitoring and fault diagnosis system (the Operation Monitoring and FaultDiagnosis system of 20MVar STATCOM, be called for short OMFDS), 20 Mvar STATCOM devices are based on the power electronic technology of turn-off thyristor (GTO) and use in electric power system, its operational monitoring and fault diagnosis subsystem are the shutdown process of comprehensive monitoring arrangement, and the running status of real-time monitoring system and record are for information about; When unusual or fault take place in system, report to the police and handle and start diagnostic program, man-machine interface is provided, after the fault system is analyzed and diagnose, for the normal operation of recovery device fast lays the foundation.STATCOM comprises numerous other subsystems, and all subsystems must normally move and cooperate mutually with the allomeric function of implement device separately, and wherein any one component failure will influence the operate as normal of whole system, even causes global fault; The communication pattern that this operational monitoring and fault diagnosis system adopt modulator-demodulator (MODEM)-telephone wire-modulator-demodulator (MODEM) is sent to the data of local OMFDS on the computer in a distant place, realize the strange land to the operation of device monitor with fault after the analyzing and diagnosing function.And design and integrated corresponding signal process algorithm calculate their measurement realizing in OMFDS.Instantaneous electric weight is based on the instantaneous sampling value of signal, help the reflection object short-term transient state instantaneous feature and and then the control in real time of fast implementation speed, but its short data window definition mode makes it be subject to the influence of non-characteristic signals such as harmonic wave, noise; The definition of tradition electric weight is based on the periodicity observation model of signal, represented the long-term stable average characteristic of signal, make it can not show the change procedure of actual device state well but it measures the relatively long characteristics of time lag, be difficult to adapt to the monitoring requirement of quick FACTS controller.Document 1,2,3 described supervisory control systems are integral type monitoring systems, monitoring to as if quadruple STATCOM; There are the following problems for this monitoring system: 1) passage of signals collecting is few, and can not expand; 2) phase is gathered sampling point few (48 point) weekly, can not meet the demands; 3) the record ripple after the fault has only the waveform of STATCOM device not have the waveform of network system; 4) system autodiagnosis function imperfection; 5) reliability is not high; 6) system alarm function imperfection; 7) communication function is poor, a distant place " dialing " visit difficulty; 8) network savvy is poor, the well communication of host computer/slave computer; 9) man-machine interface demonstration/refresh rate is slow, exploitation/modification difficulty.
Summary of the invention the objective of the invention is for solving the weak point of prior art, designs the layered distribution type monitoring system of a kind of chain type STATCOM based on optical fiber controller local area network (CAN) bus.The present invention judges the state and the malfunction of chain type STATCOM work according to the main circuit equipment operating mode that monitors, and the various states that can define chain type STATCOM according to the digital quantity and the analog quantity of its input and output also carry out tight, real-time monitoring to each operating state.The present invention is applicable to the real-time layered distribution type monitoring of big capacity STATCOM system or other flexible electrical power trans mission/distribution system FACTS/DFACTS devices.
The layered distribution type monitoring system of a kind of chain static synchronous compensator (STATCOM) that the present invention proposes, it is levied and is, comprise the dispatch layer of forming by higher level's dispatching and remote station computer, realize the data acquisition of controller local area network (CAN) bus network and the station level and the wall that constitutes by a plurality of bottom monitor controller LAN node that link to each other by Controller Area Network BUS of the CSRC web server computer formation of issuing to network by one; Its connecting relation is; The computer of this dispatch layer carries out telecommunication by the modem dialup or the webserver by Ethernet and station level; This wall middle controller LAN node is connected with station level by controller local area network optical fiber; Said each bottom monitor controller LAN node comprises microcontroller, and coupled respectively data storage, program storage, DIP device, digital demonstration, DC power supply, analog to digital converter, digital to analog converter, digital quantity input and output, serial port, controller local area network controller, also comprise controller local area network fiber optic interface circuits by photoelectricity is isolated, the controller local area network transceiver links to each other with the controller local area network controller; The controller local area network signal is communicated by letter with other controller local area network nodes on the controller local area network network on the spot by the controller local area network fiber optic interface circuits; The webserver of said station level comprises computer-controller local area network card, digital quantity input/output cards, mould/number card, GPS (Global Position System) card and network interface card, this computer-controller local area network card bus and the controller local area network node communication of monitoring on the spot; This digital quantity output card is used for chain static synchronous compensator is carried out operation indication, pulse blocking faulty indication, the water-cooled of locking pulse and trip operation, STATCOM and reports to the police and STATCOM faulty indication and audio alert; This mould/number card is gathered network system voltage, STATCOM voltage, STATCOM output current and dc power supply; This digital quantity input card collection inserts transformer temperature protection signal, transformer blower fan fault-signal, access electrical network master switch combined floodgate/trip signal, dc power supply alarm failure signal, pulse blocking signal, chain static synchronous compensator by-passing signal, controller failure signal, control power failure signal, water-cooled alarm signal, water-cooled orderly closedown and water-cooled disorderly closedown signal; This GPS (Global Position System) card provides the standard time service time for this monitoring system.
Characteristics of the present invention and effect:
The layered distribution type monitoring system of chain type STATCOM of the present invention system is except carrying out the monitor closely the working condition of chain type STATCOM system, also the working condition of himself equipment component such as analog acquisition card, digital data acquisition card etc. is carried out in real time, monitored reliably, the main circuit equipment operating mode that the present invention monitors according to monitoring system is judged the state and the malfunction of chain type STATCOM system works, and the complete record ripple of fault-signal and optical-fibre communications reliably are difficult point and the keys that chain type STATCOM layered distribution type monitoring system of the present invention solves.
The invention solves monitoring, data management, network data issue, failure wave-recording and these technical barriers of fault alarm of STATCOM operating state, malfunction.This layered distribution type monitoring system is convenient to expand and transplanting.
Description of drawings
Fig. 1 is the layered distribution type monitoring system theory of constitution figure of chain type STATCOM of the present invention.
Fig. 2 is that single-CAN node of the present invention is formed schematic diagram.
The layered distribution type monitoring system of the chain static synchronous compensator (STATCOM) of embodiment the present invention's design reaches embodiment in conjunction with the accompanying drawings and is described in detail as follows:
The layered distribution type monitoring system of chain type STATCOM of the present invention is formed embodiment as shown in Figure 2.This embodiment is that whole monitoring system is divided into dispatch layer, station level and wall at the layered distribution type monitoring system of the chain type STATCOM of optical fiber controller local area network (CAN) bus, and concrete formation is described below respectively:
(1) dispatch layer
The present embodiment dispatch layer comprises higher level's dispatching and remote station computer (adopting the equipment of prior art), can communicate by modem dialup or the CSRC web server computer by Ethernet and station level.The monitoring image of dispatch layer is to be issued by the webserver of station level.Dispatch layer is the management level of monitoring system.
(2) station level
The supervisory control comuter webserver of station level setting of the present invention is the core of whole monitoring system, realizes the data acquisition of CAN bus network and issues to network.The station level of present embodiment comprise 2 each other the CSRC webserver of stand-by heat (Web Server) (only can realize repertoire of the present invention fully with a CSRC webserver, using two makes the system works more reliable), i.e. WEB server A among Fig. 1 and WEB server B.The WEB server is the core of whole monitoring system, finishes all monitoring functions of native system and is published to dispatch layer by network.The WEB server of station level comprises computer-controller local area network (PC-CAN) card, digital quantity input/output cards, mould/number card, GPS (Global Position System) (GPS) card and network interface card etc., by PC-CAN card bus and the CAN node communication of monitoring on the spot; Carry out operation indication, pulse blocking faulty indication, the water-cooled of locking pulse and trip operation, STATCOM reports to the police and STATCOM faulty indication and audio alert etc. by the digital quantity output card; Gather 10kV network system voltage, 10kVSTATCOM voltage, STATCOM output current and DC48V power supply etc. by mould/number card; Gather 110kV/10kV by the digital quantity input card and insert transformer excess temperature 1 (120 degree), 110kV/10kV inserts transformer excess temperature 2 (135 degree), 110kV/10kV inserts light transformer gas (120 degree), 110kV/10kV inserts transformation and thinks highly of gas (135 degree), 110kV/10kV inserts the transformer blower fan fault, 10kV inserts the combined floodgate/tripping operation of electrical network master switch, DC48V power-supply system alarm failure, the DC48V power-supply system tripping operation fault of monitoring system self, pulse blocking, chain type STATCOM bypass, controller failure, the control power failure, water-cooled is reported to the police, water-cooled orderly closedown and water-cooled disorderly closedown etc.; Provide the standard time service time by the GPS card to system; Station level is by the computernetworking of network interface card and dispatch layer.
(3) wall
The wall of present embodiment is provided with 40 bottom monitoring CAN nodes (CAN unit) altogether, wherein 30 CAN nodes are monitored 30 STATCOM link units respectively, 1 monitoring STATCOM output current, 1 monitoring STATCOM output voltage, 1 monitoring 110kV electrical network busbar voltage, 1 monitoring 220kV electrical network busbar voltage, other are standby.Each bottom STATCOM monitoring CAN design of node has mould/number conversion to import 3 the tunnel, and sampling resolution is 20 microseconds, gathers output voltage, capacitance current and capacitance voltage respectively; Be provided with digital quantity input signal 12 tunnel, be respectively that 4 gate pole conducting thyristors (IGCT) fault-signal, 1 overcurrent block, 1 overcurrent tripping, 1 overvoltage signal block, 1 voltage balancing circuit fault, 1 locking signal, 1 trip signal, 1 control power failure, standby 1.STATCOM current monitoring CAN node is monitored 3 phase currents, and receives blockade/trip signal.STATCOM voltage monitoring CAN node is monitored 3 phase voltages, and receives blockade/trip signal.110kV electrical network busbar voltage monitoring CAN node is monitored 3 phase voltages, and receives blockade/trip signal.220kV electrical network bus monitoring CAN node is monitored 3 phase voltages, and receives blockade/trip signal.Each bottom monitoring CAN node has all designed CAN telecommunication optical fiber interface.Each bottom monitoring CAN node is provided with this unit number with wire jumper, shows the unit number that is provided with charactron.Monitoring CAN node carries out 3 tunnel analog quantitys continuously and records ripple, when receiving blockade or trip signal, continues record ripple 2 all after date storages front and back 2 cycle recorder datas, sends to the centralized monitor computer WEB server of station level.The CAN node regularly sends 2 cycle datas at ordinary times and opens into the centralized monitor computer WEB server of amount state to station level.
CAN bus of the present invention connects the CAN node by fiber optic network, and the single-CAN node is formed structure as shown in Figure 2.The CAN node comprises microcontroller, and coupled data storage, program storage, DIP device, digital demonstration, DC48V power supply and uninterrupted power supply (standby), analog to digital converter, digital to analog converter, digital quantity input and output, serial port RS-232 interface or serial port RS-485 interface, the CAN controller of difference, also comprise CAN fiber optic interface circuits by photoelectricity is isolated, the CAN transceiver links to each other with the CAN controller.Microcontroller is the core of CAN node, and the CAN signal communicates by other CAN nodes on CAN controller, photoelectricity isolation, CAN transceiver, CAN fiber optic interface circuits and the CAN network.
The all optional usefulness of the components and parts of the CAN node of above-mentioned composition dispatch layer, station level, wall has the conventional products of identical function and realizes.
Present embodiment is provided with the node of distributed monitoring system with the CAN bus; The optical fiber transmission network of system data is set with CAN bus fibre modulator-demodulator and bus type CAN modulator-demodulator; The standard time service clock of system is set with GPS (Global Position System) GPS (GlobalPosition System); The network that the WEB server is set with Server-Client (server-user) mode is issued/is browsed.Adopt the power supply of direct current 48V power supply, and also can use uninterrupted power supply (UPS-Uninterruptable Power Supply) that communication field uses as stand-by power supply.The CAN bus communication speed of present embodiment is 0-1MBPS.Each CAN node has 3 tunnel 12 mould/number conversions to import synchronously, and sampling resolution reaches 20 microseconds; Each CAN node can respectively be recorded 2 cycles of ripple to electric current, the voltage of STATCOM and electrical network in the front and back that fault occurs.
Present embodiment is worked out man-machine interface (Human-Machine Interface-HMI) with configuration software; Adopt the user program of configuration software establishment can inquire about/recollect six months operation note in its station level webserver; Can inquire about/recollect trimestral signal record; Have the analog quantity history curve and recollect function; Can browse on the computer of dispatch layer/inquire about.Has report capability; The cascade protection function; Fault location function; The real-time status function for monitoring; Monitor startup/stopped process of STATCOM comprehensively; Self diagnosis and help function; Network WEB issue and IE function of browse.Have STATCOM working state monitoring and database management function.The configuration software user program sampling time is 5.5 milliseconds.
Claims (3)
1, a kind of layered distribution type monitoring system of chain static synchronous compensator, it is characterized in that, comprise the dispatch layer of forming by higher level's dispatching and remote station computer, by a data acquisition and CSRC web server computer station level that constitutes and the wall that constitutes by a plurality of bottom monitor controller LAN node that link to each other by Controller Area Network BUS issued to network that realizes the Controller Area Network BUS network; Its connecting relation is: the computer of this dispatch layer carries out telecommunication by the modem dialup or the webserver by Ethernet and station level; This wall middle controller LAN node is connected with station level by controller local area network optical fiber; Said each bottom monitor controller LAN node comprises microcontroller, and coupled respectively data storage, program storage, DIP device, digital demonstration, DC power supply, analog to digital converter, digital to analog converter, digital quantity input and output, serial port, controller local area network controller, also comprise controller local area network fiber optic interface circuits by photoelectricity is isolated, the controller local area network transceiver links to each other with the controller local area network controller; The controller local area network signal is communicated by letter with other controller local area network nodes on the controller local area network network on the spot by the controller local area network fiber optic interface circuits; The webserver of said station level comprises computer-controller local area network card, digital quantity input/output cards, mould/number card, GPS (Global Position System) card and network interface card, this computer-controller local area network card bus and the controller local area network node communication of monitoring on the spot; This digital quantity output card is used for chain static synchronous compensator is carried out operation indication, pulse blocking faulty indication, the water-cooled of locking pulse and trip operation, STATCOM and reports to the police and STATCOM faulty indication and audio alert; This mould/number card is gathered network system voltage, STATCOM voltage, STATCOM output current and dc power supply; This digital quantity input card collection inserts transformer temperature protection signal, transformer blower fan fault-signal, access electrical network master switch combined floodgate/trip signal, dc power supply alarm failure signal, pulse blocking signal, chain static synchronous compensator by-passing signal, controller failure signal, control power failure signal, water-cooled alarm signal, water-cooled orderly closedown and water-cooled disorderly closedown signal; This GPS (Global Position System) card provides the standard time service time for this monitoring system.
2, the layered distribution type monitoring system of chain static synchronous compensator as claimed in claim 1, it is characterized in that, said wall is provided with a plurality of bottom monitor controller LAN node, comprise and monitor a plurality of STATCOM link unit controller local area network nodes respectively, the controller local area network node of monitoring STATCOM output current, the controller local area network node of monitoring STATCOM output voltage, the controller local area network node of monitoring electrical network busbar voltage; Each bottom monitor controller LAN node is provided with multichannel mould/number conversion input, gathers output voltage, capacitance current and the capacitance voltage signal of chain static synchronous compensator respectively; Being provided with multi-path digital amount input signal, is respectively to comprise gate pole conducting transistors breakdown signal, overcurrent locking signal, overcurrent tripping signal, overvoltage signal locking signal, voltage balancing circuit fault-signal, locking signal, trip signal, control power failure signal; The controller local area network node of said monitoring STATCOM electric current is monitored 3 phase currents, and receives blockade/trip signal; Said monitoring STATCOM voltage controller LAN node is monitored 3 phase voltages, and receives blockade/trip signal; The controller local area network node of said monitoring electrical network busbar voltage is monitored 3 phase voltages, and receives blockade/trip signal; Each bottom monitor controller LAN node all is provided with controller local area network telecommunication optical fiber interface; Each bottom monitor controller LAN node is provided with this unit number with wire jumper, show the unit number that is provided with charactron, the monitor controller LAN node is carried out multi-analog record ripple continuously, when receiving blockade or trip signal, continue the record ripple and store front and back multicycle recorder data after the multicycle, send to the centralized monitor web server computer of station level, the controller local area network node regularly sends the multicycle data at ordinary times and opens into the state that opens or closes of the amount centralized monitor web server computer to station level.
3, the layered distribution type monitoring system of chain static synchronous compensator as claimed in claim 1 or 2 is characterized in that, said station level also is provided with second CSRC web server computer and first stand-by heat each other.
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| CN1881744B (en) * | 2005-06-16 | 2010-05-12 | 许继集团有限公司 | High voltage DC power transmission converter station real-time monitoring system realizing method |
| CN100429522C (en) * | 2006-03-17 | 2008-10-29 | 中国电力科学研究院 | Two-way valve working sequence with single pouring of synthetic work condition experimental device |
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