CN102916487A - System and method for realizing low-frequency self-starting of unit - Google Patents
System and method for realizing low-frequency self-starting of unit Download PDFInfo
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- CN102916487A CN102916487A CN2012103749963A CN201210374996A CN102916487A CN 102916487 A CN102916487 A CN 102916487A CN 2012103749963 A CN2012103749963 A CN 2012103749963A CN 201210374996 A CN201210374996 A CN 201210374996A CN 102916487 A CN102916487 A CN 102916487A
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Abstract
The invention relates to the technical field of a system and a method for realizing the low-frequency self-starting of a unit, which can be the improvement of an emergency automatic-control technology for a power generation unit of a power system for guaranteeing the stability of a power grid. According to the system, an in-place monitoring control element, a PLC (programmable logic controller), an upper computer server, an operator station and relevant network equipments form the redundancy configuration of a communication path of important equipment. The system and the method are realized depending on a computer supervisory control system of a power plant, the investment is smaller, the coupling with other control logics is low, the movement is sensitive and reliable, the parameter setting is comprehensive and simple, and the commonality is stronger. Meanwhile, the system and the method can be perfectly combined with an automatic power generation control system in the existing power plant, and the problem that the conflict with the control logic of the automatic power generation control system after the low-frequency self-starting control can be avoided through effective measures, so as to provide an effective guarantee for the processing for emergent accidents of the power plant under the special condition.
Description
Technical field
The present invention relates to the technical field of a kind of unit low frequency self-starting system and method, is for ensureing that the stabilization of power grids is for the improvement of the urgent automatic control technology of electric power system generating set.
Background technology
Low all self-starting devices are maintenance system frequency stabilizations and setting, under accident conditions, electric power system loses a large amount of power supplys causes power that serious imbalance occurs and system frequency sharply descends, to cause a series of serious consequence and loss to the electricity consumption user, in this case, low all self-starting device actions, drop into unit for subsequent use, increase system power, with the systems stabilisation frequency, ensure the quality of power supply.Development along with electric power system, the continuous growth of net capacity, society is more and more higher to the requirement of the quality of power supply, significantly reduce when system's unit output occurring, in the lower situation of mains frequency, the unit primary frequency modulation might not satisfy the stable needs of system frequency, and in general the adjustable range of unit primary frequency modulation is 10% of its rated capacity.As a kind of processing method to system burst sexual behavior part, the power plant unit improves the stability of electric power system in the serious immediately self-starting systems stabilisation preferably during low week of system.From technological layer, utilize existing computer supervisory control system can realize preferably unit self-starting during low week in system in the hydroelectric plant.
Summary of the invention
In order to solve the deficiencies in the prior art part, the invention provides a kind of unit low frequency self-starting system and method, its objective is and to combine by automatic electricity generation control system perfect and existing power plant, use effective means to avoid mutually conflicting with the automatic electricity generation control system control logic behind low all self-starting control actions.
The present invention is achieved by the following technical solutions:
Unit low frequency self-starting system at hardware aspect, is made of the communication path redundant configuration of visual plant terrain Monitoring and Controlling element, PLC, host computer server, operator station and related network device; The terrain slave computer is bus structures, and terrain Monitoring and Controlling element and PLC equipment interconnect by the MB+ network; The host computer network is star-shaped network structure, and PLC, host computer server, operator station all interconnect by optical fiber or twisted-pair feeder.
Grid Ethernet is main communication media, and equipment component is by serial communication, and network configuration is the layer distributed structure, and the core of the superiors is that computer server is responsible for processing comparatively complicated problem such as data storage and processing, complex logic computing; The intermediate layer is slave computer PLC control unit; Terrain Monitoring and Controlling element is the execution unit of bottom; Thereby combined with slave computer PLC control unit by computer supervisory control system and to have realized a kind of comparatively general and AGC and the automatic low all self-starting modes of variable element that match of startup-shutdown strategy.
Unit low frequency self-start method is: when satisfying unit low frequency self-starting system low frequency self-starting condition, set unit and will enter unit self-starting flow process, idiographic flow is as follows:
(1) sends alarm signal and remind the low all self-starting actions of operations staff;
(2) owing to full factory deferrable load after the unit self-starting will change, if system drops into AGC and automatic startup-shutdown control may cause the automatic startup-shutdown of unit system moving, control so at first will withdraw from the automatic startup-shutdown of all controlled units after low all self-starting actions;
(3) send the start order, enter unit Auto Power On flow process;
(4) cycle criterion set state after unit enters the generating attitude, is automatic power regulation with unit Power Regulation setting state; If unit is AGC input state then distributes unit load according to the AGC control strategy, if unit does not drop into AGC control then unit load is adjusted to assumed load.
After described unit low frequency self-starting system drops into low all self-starting control, the system state monitoring flow process will be enabled in running background cycle monitoring system state automatically, and idiographic flow is as follows:
(1) take 1 second as a monitoring periods, system monitoring flow process per second automatic monitoring system state;
(2) monitoring system frequency at first, if system frequency too low (＜48Hz) then be judged to be system blackout maintenance or sensor fault, this monitoring is skipped in counter O reset;
(3) if system frequency is lower than the setpoint frequency lower bound, carry out next step monitoring, otherwise this monitoring end, next monitoring periods is waited in counter O reset;
(4) if system voltage excessively low (＜44kV) decision-making system is in the interruption maintenance state, finishes this monitoring, next monitoring periods is waited in counter O reset;
(5) satisfy frequency and voltage triggered condition, counter+1;
(6) if counter values greater than low all delay times of setting, carry out next step operation, otherwise wait for next monitoring periods;
(7) if unit is set as low all self-starting units and is in stand-by state then starts unit, otherwise continue to wait for.
Advantage and beneficial effect: system of the present invention relies on power plant's computer supervisory control system to realize, invest littlely, and low with other control logic couplings, it is reliable to be active in one's movements, and parameter arranges comprehensively simply, and versatility is stronger.Can combine by automatic electricity generation control system perfect and existing power plant simultaneously, use effective means to avoid behind low all self-starting control actions and the conflicting problem of automatic electricity generation control system control logic, processing for power plant's emergency episode under special circumstances provides effective guarantee.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further to describe in detail.
Fig. 1 is system state monitoring flow chart of the present invention;
Fig. 2 is unit self-starting flow chart of the present invention.
Embodiment
The present invention is a kind of unit low frequency self-starting system and method, and system utilizes computer supervisory control system to combine with slave computer PLC control unit and realized that a kind of comparatively general variable element that matches with AGC and automatic startup-shutdown strategy hangs down all self-starting modes,
Unit low frequency self-starting system is made of the communication path redundant configuration safeguards system reliability of visual plant at hardware aspect terrain Monitoring and Controlling element, PLC, host computer server, operator station and related network device.
Grid Ethernet is main communication media, and equipment component is by serial communication, and network configuration is the layer distributed structure, and the core of the superiors is that computer server is responsible for processing comparatively complicated problem such as data storage and processing, complex logic computing etc.; The chief leading cadre of operator station machine interactive function; The intermediate layer is slave computer PLC control unit, mainly is responsible for data relay, sequential control, reaches urgent interrupt response; Terrain Monitoring and Controlling element is the execution unit of bottom.Thereby combined with slave computer PLC control unit by computer supervisory control system and to have realized a kind of comparatively general and AGC and the automatic low all self-starting modes of variable element that match of startup-shutdown strategy.
Major function of the present invention is as follows:
1, after unit low frequency self-starting system frequency is lower than the setpoint frequency certain hour, automatically starts and specify low all self-starting units;
2, according to unit low frequency self-starting system demand, can independently set low all self-starting frequencies and unit starting time of delay;
3, when power plant has many units to possess as low all self-starting machine set conditions, can specify unit as low all self-starting units;
4, when there are many outlets in power plant, can specify to monitor that specific outlet frequency is as low all self-startings condition of setting out;
5, can with AGC and the perfect cooperation of the automatic startup-shutdown of unit system;
6, after unit low frequency self-starting system triggers low all self-starting functions, when starting the self-starting unit, send alarm signal and remind the operations staff to carry out corresponding accident treatment.
Concrete function is described below:
1, monitoring image
The monitoring image of unit low frequency self-starting system low frequency self-starting is integrated in the power of the assembling unit control desk picture state that arranges of display system low frequency self-starting.When showing the machine group number, represent that current this unit is set as low frequency self-starting unit, represent that when showing " excision " system does not set low all self-starting units.In the state information left side " setting " button is arranged, click keys can enter system's low frequency self-starting picture is set.
2, parameter setting
Enter after the self-starting of unit low frequency self-starting system low frequency arranges picture, for each unit is provided with a parameter form is set in the picture.Form divides two parts: data show, the parameter setting.
Wherein the data demonstration comprises following content:
(1) circuit picks up: expression unit low frequency self-starting system is monitoring that circuit now.Hill, Shuan Gou power station monitor the 220kV circuit.And the Shi Long power station monitors the turquoise A-wire at the circuit breaker of turquoise A-wire, the first and second isolation switchs during all in the position of closing, and monitors turquoise second line in other situations;
(2) line frequency: show the system frequency of the circuit that monitors, be accurate to 2 decimals, unit is Hz;
(3) line voltage distribution: show the system voltage of the circuit that monitors, being shown to 2 decimal units is kV;
(4) set state: present current set state is respectively: stand-by state, Light Condition, idling conditions, generating state, five states of not stationary state.
Wherein the parameter setting comprises following content:
(1) low all self-startings (dropping into/withdraw from): whether what set this TV station unit is low all self-starting units.Being that other units of same power station withdraw from low all self-starting functions automatically when a unit is set to low all self-starting units, is that low all self-starting functions are withdrawed from the power station automatically when all units of same power station all withdraw from low all self-starting functions.
(2) frequency setting: the trigger rate that unit low frequency self-starting action is set.Be accurate to 2 of decimal points, unit is Hz, and scope is 0-50, default value 49.25Hz;
(3) delay time: after line frequency continues to be lower than setpoint frequency and reaches the duration that delay time sets, unit will start automatically.Be accurate to integer-bit, the S of unit, scope 0-100, default value 5S;
(4) load is given: after the self-starting of unit low frequency is set, and automatically given burden with power.Be accurate to integer-bit, the MW of unit, scope 0-full load, default value is at full capacity.
3, fault alarm
When unit satisfies system's low frequency self-starting condition, and when automatically starting.Supervisory control system will be sent failure alarm signal when sending the start order, alarm signal can be inquired about in electric fault.
Functions implementing the present invention are as follows:
1, system state monitoring flow process.
As shown in Figure 1, after unit low frequency self-starting system drops into low all self-starting control, the system state monitoring flow process will be enabled in running background cycle monitoring system state automatically, and idiographic flow is as follows:
(1) take 1 second as a monitoring periods, system monitoring flow process per second automatic monitoring system state;
(2) monitoring system frequency at first, if system frequency too low (＜48Hz) then be judged to be system blackout maintenance or sensor fault, this monitoring is skipped in counter O reset;
(3) if system frequency is lower than the setpoint frequency lower bound, carry out next step monitoring, otherwise this monitoring end, next monitoring periods is waited in counter O reset;
(4) if system voltage excessively low (＜44kV) decision-making system is in the interruption maintenance state, finishes this monitoring, next monitoring periods is waited in counter O reset;
(5) satisfy frequency and voltage triggered condition, counter+1;
(6) if counter values greater than low all delay times of setting, carry out next step operation, otherwise wait for next monitoring periods;
(7) if unit is set as low all self-starting units and is in stand-by state then starts unit, otherwise continue to wait for.
2, unit self-starting flow process.
As shown in Figure 2, when satisfying unit low frequency self-starting system low frequency self-starting condition, set unit and will enter unit self-starting flow process, idiographic flow is as follows:
(1) sends alarm signal and remind the low all self-starting actions of operations staff;
(2) owing to full factory deferrable load after the unit self-starting will change, if system drops into AGC and automatic startup-shutdown control may cause the automatic startup-shutdown of unit system moving, control so at first will withdraw from the automatic startup-shutdown of all controlled units after low all self-starting actions;
(3) send the start order, enter unit Auto Power On flow process;
(4) cycle criterion set state after unit enters the generating attitude, is automatic power regulation with unit Power Regulation setting state.If unit is AGC input state then distributes unit load according to the AGC control strategy, if unit does not drop into AGC control then unit load is adjusted to assumed load.
Claims (3)
1. unit low frequency self-starting system is characterized in that: at hardware aspect, be made of the communication path redundant configuration of visual plant terrain Monitoring and Controlling element, PLC, host computer server, operator station and related network device; The terrain slave computer is bus structures, and terrain Monitoring and Controlling element and PLC equipment interconnect by the MB+ network; The host computer network is star-shaped network structure, and PLC, host computer server, operator station all interconnect by optical fiber or twisted-pair feeder;
Grid Ethernet is main communication media, and equipment component is by serial communication, and network configuration is the layer distributed structure, and the core of the superiors is that computer server is responsible for processing comparatively complicated problem such as data storage and processing, complex logic computing; The intermediate layer is slave computer PLC control unit; Terrain Monitoring and Controlling element is the execution unit of bottom; Thereby combined with slave computer PLC control unit by computer supervisory control system and to have realized a kind of comparatively general and AGC and the automatic low all self-starting modes of variable element that match of startup-shutdown strategy.
2. unit low frequency self-start method is characterized in that: when satisfying unit low frequency self-starting system low frequency self-starting condition, set unit and will enter unit self-starting flow process, idiographic flow is as follows:
(1) sends alarm signal and remind the low all self-starting actions of operations staff;
(2) owing to full factory deferrable load after the unit self-starting will change, if system drops into AGC and automatic startup-shutdown control may cause the automatic startup-shutdown of unit system moving, control so at first will withdraw from the automatic startup-shutdown of all controlled units after low all self-starting actions;
(3) send the start order, enter unit Auto Power On flow process;
(4) cycle criterion set state after unit enters the generating attitude, is automatic power regulation with unit Power Regulation setting state; If unit is AGC input state then distributes unit load according to the AGC control strategy, if unit does not drop into AGC control then unit load is adjusted to assumed load.
3. unit low frequency self-start method according to claim 2, it is characterized in that: after described unit low frequency self-starting system drops into low all self-starting control, the system state monitoring flow process will be enabled in running background cycle monitoring system state automatically, and idiographic flow is as follows:
(1) take 1 second as a monitoring periods, system monitoring flow process per second automatic monitoring system state;
(2) monitoring system frequency at first, if system frequency too low (＜48Hz) then be judged to be system blackout maintenance or sensor fault, this monitoring is skipped in counter O reset;
(3) if system frequency is lower than the setpoint frequency lower bound, carry out next step monitoring, otherwise this monitoring end, next monitoring periods is waited in counter O reset;
(4) if system voltage excessively low (＜44kV) decision-making system is in the interruption maintenance state, finishes this monitoring, next monitoring periods is waited in counter O reset;
(5) satisfy frequency and voltage triggered condition, counter+1;
(6) if counter values greater than low all delay times of setting, carry out next step operation, otherwise wait for next monitoring periods;
(7) if unit is set as low all self-starting units and is in stand-by state then starts unit, otherwise continue to wait for.
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| CN103453199A (en) * | 2013-09-13 | 2013-12-18 | 国家电网公司 | Method for ensuring normal starting of unit in case of loss of position signals of bypass valve of main water inlet valve |
| CN112671013A (en) * | 2021-01-07 | 2021-04-16 | 福建仙游抽水蓄能有限公司 | Frequency logic control method for locking unit start and stop |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103453199A (en) * | 2013-09-13 | 2013-12-18 | 国家电网公司 | Method for ensuring normal starting of unit in case of loss of position signals of bypass valve of main water inlet valve |
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| CN112671013A (en) * | 2021-01-07 | 2021-04-16 | 福建仙游抽水蓄能有限公司 | Frequency logic control method for locking unit start and stop |
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Application publication date: 20130206 |