CN201203661Y

CN201203661Y - Monitoring system for large-sized generator set

Info

Publication number: CN201203661Y
Application number: CNU2008200048068U
Authority: CN
Inventors: 洪建山
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-14
Filing date: 2008-03-14
Publication date: 2009-03-04
Anticipated expiration: 2018-03-14

Abstract

The utility model relates to a large generating set monitoring system, which comprises a keyboard, a printer, an integrated workstation, an external communication device, an analog-to-digital conversion module, a switching value output module, a PT/CT input module, a data collection and signal isolation module, and a warning output and monitoring software system. The system mainly monitors the electric quantity of a generator, has low-frequency oscillation and subsynchronous oscillation realtime monitoring, recording and display functions, is used for online recognition of the internal parameters of a generator, spectrum analysis, digital wave recording, running limit diagram display, realtimely running working condition collecting/calculating/monitoring, P-Q diagram record and display, detecting generator power-angle delta and stability margin, running the simulation and prediction of working condition, and the like. The utility model monitors software and hardware at the same time, the control is visible, the operation is simple and convenient; and the relay and photocoupler two-stage insolating measure is used, which greatly improves the anti-electromagnetic interference ability of the whole control system, as well as the system security and reliability.

Description

Large-scale generator set monitoring system

Technical field

The utility model relates to large-scale generator set monitoring system.

Background technology

Along with the fast development of power industry, online microcomputer supervision and automatic control technology are in application on power system more and more widely.China factory station automatic has entered a brand-new developing stage at present.In large thermal power plant, online microcomputer monitoring software systems have generally been installed in boiler, steam turbine aspect.Comparatively speaking, the monitoring of generator and exciter is also relatively backward, still maintains conventional electric weight (as: voltage, electric current, frequency, power etc.) is carried out the static level that monitors by the table meter, can't infer and predict the limit and the nargin of each operating condition.And the power of micro computer monitoring all becomes conventional supervision, test, form and is easy to realize, makes factory's station automatic level all improve a level on the scope, on the content, on the scale, on the cycle.In addition, along with the progressively expansion of system, improved for the requirement of set steady, this makes the monitoring at generator amature merit angle more and more seem essential.The operation of Generator Set is the direction of power network development from now on, the above Generator Set of 300MW adopts brushless excitation system more, rotor electric weight and winding temperature rise all can not directly be measured, and this gives operation, detects and brought difficulty, is badly in need of having new method of testing to solve this difficult problem.Therefore adopt microcomputer safety monitoring system to have great practical value with dynamic and static function for monitoring.

Aspect security monitoring, at present both at home and abroad mainly be monitoring to system load flow, considering that network structure, prediction failure, the restriction of circuit trend and generator output determine the stability and safety territory of system.Security monitoring research to the generator body is less.In a spot of research, also bias toward the supervision of normal operating condition, lack and consider the influence of parameter of saturation operating condition.

The utility model content

The purpose of this utility model provides large-scale generator set monitoring system, has realized real-time monitoring, record and demonstration to generator electric parameters and phase angle monitoring, low-frequency oscillation and sub-synchronous oscillation; Monitoring comprehensively, and is simple to operation, improved security, the reliability of system to a certain extent.

The purpose of this utility model is to be achieved through the following technical solutions:

Large-scale generator set monitoring system, comprise keyboard, printer, industrial workstation, external communication device, analog-to-digital conversion module, switching value output module, PT/CT load module, data acquisition and Signal Spacing module, report to the police and export and monitoring software system, the unidirectional industrial workstation that is connected to of keyboard, industrial workstation has serial ports and parallel port, Ethernet interface, parallel reversible connection serial line interface of industrial workstation and interface control module, the unidirectional external communication device that is connected to of serial line interface; Industrial workstation unidirectional printer and the switching value output module of being connected to that walk abreast, unidirectional data acquisition and the Signal Spacing module of being connected to of switching value output module, data acquisition and Signal Spacing module parallel unidirectional be connected to analog-to-digital conversion module, PT/CT load module and the output of reporting to the police, the unidirectional industrial workstation that is connected to of analog-to-digital conversion module, the unidirectional backstage monitoring software system that is connected to of output of reporting to the police.

The beneficial effect of large-scale generator set monitoring system described in the utility model is: microcomputer detecting system provides the supervision to generator stable state electric weight, based on the P-Q service chart, obtain taking into account the saturated parameter of electric machine of non-linear factor influence and the funtcional relationship of operating condition of waiting with online parameters identification method, actual condition in order to accurate reflection generator, and constitute the operating condition safety monitoring on this basis, monitoring when having realized soft, hardware is controlled simple and clear, simple to operation; Adopted relay and photoelectrical coupler two-stage quarantine measures, improved the anti-electromagnetic interference capability of The whole control system greatly, the security of system, reliability are improved.

Description of drawings

Fig. 1 is the structural representation block diagram of the described large-scale generator set monitoring system of the utility model embodiment;

Fig. 2 is the fundamental diagram of the described large-scale generator set monitoring system of the utility model embodiment.

Among the figure:

1, keyboard; 2, printer; 3, industrial workstation; 4, serial line interface; 5, external communication device; 6, interface control module; 7, analog-to-digital conversion module; 8, switching value output module; 9, PT/CT load module; 10, data acquisition and Signal Spacing module; 11, warning output; 12, monitoring software system; A, filtering module; B, multi-way switch control module; C, sampling keep module; D, A/D modular converter; E, CPU control module.

Embodiment

As shown in Figure 1, the described large-scale generator set monitoring system of the utility model embodiment, comprise keyboard 1, printer 2, industrial workstation 3, external communication device 5, analog-to-digital conversion module 7, switching value output module 8, PT/CT load module 9, data acquisition and Signal Spacing module 10, warning output 11 and monitoring software system 12, the keyboard 1 unidirectional industrial workstation 3 that is connected to, industrial workstation 3 has serial ports and parallel port, Ethernet interface, industrial workstation 3 parallel reversible connection serial line interface 4 and interface control modules 6, the serial line interface 4 unidirectional external communication devices 5 that are connected to; Industrial workstation 3 parallel unidirectional printer 2 and the switching value output modules 8 of being connected to, switching value output module 8 unidirectional data acquisition and the Signal Spacing modules 10 of being connected to, data acquisition and 10 parallel unidirectional be connected to analog-to-digital conversion module 7, PT/CT load module 9 and the outputs 11 of reporting to the police of Signal Spacing module, the analog-to-digital conversion module 7 unidirectional industrial workstations 3 that are connected to, the output 11 unidirectional monitoring software systems 12 that are connected to of reporting to the police.

As shown in Figure 2, the principle of work of the described large-scale generator set monitoring system of the utility model embodiment is: generator alternating current amount and hydrogen temperature, Hydrogen Vapor Pressure to input are sampled, after corresponding PT, CT input, carry out Filtering Processing by isolated location A, through after the filtering, exportable peak value is-10 volts～+ 10 volts a AC signal, converts digital quantity to and imports CPU control module E into after handling by A/D modular converter D and finally handle.

The described large-scale generator set monitoring system of the utility model embodiment, its hardware systems: adopt the exclusive data harvester that generator electric weight (as meritorious, idle, frequency) is gathered in real time, and calculate the stable state electric weight.Software architecture: realize man-machine interface and various curve display etc., and use the dedicated analysis program, obtain taking into account the saturated parameter of electric machine of non-linear factor influence and the funtcional relationship of operating condition of waiting with online parameters identification method, in order to the actual condition of accurate reflection generator, and constitute the operating condition monitoring on this basis.

The described large-scale generator set monitoring system of the utility model embodiment, its major function is: the detection and the demonstration of generator low-frequency oscillation information; The detection and the demonstration of generator sub-synchronous oscillation information; The collection of operating condition, calculating and demonstration; P-Q schemes to show: but this figure of this device screen display and in working point and the limit nargin indicated on the figure under the current operating condition; The detection and the demonstration at motor merit angle: can dynamically show and write down the temporal pattern of three-phase voltage and electric current, use for the system dynamics analysis.And can provide alerting signal to the negative phase sequence that broken string, three-phase imbalance, wiring cause; P, Q histogram record and showing: the histogram of one day 24 hours meritorious, load or burden without work can be stored and show to this device, looks into usefulness in order to the operations staff; The monitor record of zero load, short-circuit test: this device can be drawn family curve according to operating condition of test, and generate test report automatically when generator no-load, short-circuit test in real time.

The described large-scale generator set monitoring system of the utility model embodiment is applicable to the multimachine monitoring system: monitoring system connects by network with the backstage monitoring software system, also can be used as the generating plant monitoring software system and partly constitutes autonomous system.Be fit to monitoring of single group generator system or two generators system monitoring, can provide communication interface to be connected, reach the purpose of unified monitoring with other system (generating plant DCS monitoring software system).

Claims

1, large-scale generator set monitoring system, comprise keyboard (1), printer (2), industrial workstation (3), external communication device (5), analog-to-digital conversion module (7), switching value output module (8), PT/CT load module (9), data acquisition and Signal Spacing module (10), report to the police and export (11) and monitoring software system (12), the unidirectional industrial workstation (3) that is connected to of keyboard (1), it is characterized in that: parallel reversible connection serial line interface (4) of industrial workstation (3) and interface control module (6), the unidirectional external communication device (5) that is connected to of serial line interface (4); Industrial workstation (3) unidirectional printer (2) and the switching value output module (8) of being connected to that walk abreast, unidirectional data acquisition and the Signal Spacing module (10) of being connected to of switching value output module (8), data acquisition and Signal Spacing module (10) parallel unidirectional be connected to analog-to-digital conversion module (7), PT/CT load module (9) and the output (11) of reporting to the police, the unidirectional industrial workstation (3) that is connected to of analog-to-digital conversion module (7), output (11) the unidirectional monitoring software system (12) that is connected to of reporting to the police.