CN101515720A - Centralized control impulse type voltage-wattless automatic control system in thermal power plant - Google Patents
Centralized control impulse type voltage-wattless automatic control system in thermal power plant Download PDFInfo
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Abstract
The invention discloses a centralized control impulse type voltage-wattless automatic control system in a thermal power plant. In the system, one thermal power plant only needs to be provided with a centralized control device to perform centralized control on a plurality of electric generators and low-voltage reactors so as to achieve optimized adjustments on the plurality of the electric generators in the control device. A voltage pulse signal has access to an electric generator exciter and a reactor, and an electric power plant RTU is used for achieving preset-voltage or powerless closed loop adjustment in the electric power plant. The automatic control system provides abundant monitoring interfaces for workers in the electric power plant, provides a data-uploading communication interface for a power network automatic voltage control system, and is convenient to monitor the running conditions of the system.
Description
The present invention relates to a kind ofly in thermal power plant, can carry out the central controlled voltage power-less automatic control system of utilizing potential pulse to realize to many generating sets and a plurality of low tension reactor.
In electric power system, it is generally acknowledged that voltage and reactive power are interrelated, thereby during the set end voltage of regulator generator, the output reactive power of generator can change thereupon, power plant's high voltage bus voltage also can change thereupon simultaneously.For the safe and stable operation of the electric power system at place, power plant, must be when being necessary with generator terminal voltage, the high voltage bus voltage in power plant, high voltage bus is idle is set within the specific scope.In thermal power plant, the empty node of the magnetizing exciter by the manual operation generator comes the set end voltage of regulator generator, and then regulator generator output is idle, high voltage bus voltage and high voltage bus are idle, is the traditional approach of regulating thermal power plant's voltage power-less.Development along with computer, electronics and mechanics of communication, people have begun to consider to use auto-control mode to replace the mode of traditional manual adjustment thermal power plant voltage power-less state, and consider a plurality of power plants are placed a cover electrical network automatic voltage control system, carry out the voltage power-less in a plurality of power plants and coordinate control.
In " the electrical network automatism voltage control is in the design and the realization of large thermal power plant " literary composition of " Electric Design " magazine the 1st phase of February in 2005, the author has introduced a kind of high voltage bus voltage setting command that the electrical network automatic voltage control system sends that receives in thermal power plant, and then by the analog current signal of 4-20mA generator is controlled, realize thermal power plant's voltage power-less system of control automatically.In this system, power plant's automatic voltage is idle, and control device calculates the set end voltage set point of every generator according to the power plant's high voltage bus voltage instruction that receives, utilize the analog current signal of 4-20mA to send this set point to generator Distributed Control System (DCS), or directly send the generator excitation control system to, set the set end voltage of generator, and then the output reactive power of regulator generator, high voltage bus voltage and high voltage bus reactive power.
" automatic voltage control system (AVC) is in the application in power plant " literary composition and " Anhui electrical engineering Vocationl Technical College journal " in the 22nd the 4th phase of volume of " Anhui electric power " December in 2005 were rolled up in " discussion of a reactive voltage distant place, power plant automatic control system " literary composition of the 1st phase March the 9th in 2004, had introduced the system of each unit output reactive power of the distributed regulating station of a class.In this type systematic, need to give each generator to be equipped with an AVC adjusting device, generally also need in power plant, be equipped with a communication host computer, issue the output reactive power set point of every generator by the electrical network automatic voltage control system, power plant's communication host computer sends to the AVC adjusting device of every generator with this set point, by the AVC adjusting device generator is exported near the idle set point that is adjusted to requirement.
More than two kinds of systems all come with some shortcomings and limitation.To first kind of system, the deficiency of existence mainly is: degree of regulation is poor, owing to use the analog current signal of 4-20mA to come conveyer terminal voltage set point, the analog current signal error is bigger, can bring very big error; The power plant existed system is required high, Power Plant must be equipped with the DCS system that can set the unit set end voltage, or the unit magnetizing exciter must have the function of the set point that the current signal that receives 4-20mA transmits.To second kind of system, the deficiency of existence mainly is: system is too complicated, and equipment needed thereby is too many, increases the system maintenance amount; Can not carry out in the power plant secondary distribution idle between each unit.Simultaneously, all also there is certain limitation in these two kinds of systems: the monitoring to power station voltage Reactive Power Automatic Regulating process is not enough, the running status of each unit of power plant and bus in can not the be complete detailed supervision adjustment process; Regulatory function is comparatively single, generally can only regulate at high voltage bus voltage or the idle a kind of instruction of generator unit; Do not have feedback signal to beam back the control centre in the adjustment process, the control centre can't monitor the implementation status descending to send instructions; Do not have to consider the low tension reactor in the power plant is carried out the switching operation.
The objective of the invention is to overcome the shortcoming of existing this type systematic, provide a kind of and in thermal power plant, simultaneously many generating sets and Duo Tai low tension reactor are carried out the central controlled idle automatic control system of power station voltage that can accurately regulate the idle set point of multiple voltage in the thermal power plant.The invention is characterized in:
(1) the automatism voltage control device of a concentrated only need be installed by same thermal power plant, and many generators and a plurality of low tension reactor are carried out centralized control, reduces maintenance.
(2) can realize the idle secondary distribution of many generators in the thermal power plant, realize multicomputer optimization adjusting in the power plant.
(3) the working voltage pulse signal directly inserts generator exciter, increases the versatility of this invention system.Because nearly all existing generator exciter all has the empty node of increase and decrease excitation, thereby this magnetizing exciter access way almost goes for all generator exciters.
(4) in power plant, realize setting voltage or idle closed-loop adjustment, increase the accuracy of regulating.
(5) for the operations staff of power plant provides abundant monitor mode and interface, the operations staff can be easily monitors the implementation status of system, can carry out necessary intervention to the voltage power-less automatic control system of being invented easily where necessary.
(6) be provided with communication interface with the electrical network automatic voltage control system, can allow the electrical network automatic voltage control system monitor the implementation status of the idle setting command of being given of power station voltage easily.
For achieving the above object, provided among the present invention and a kind ofly in thermal power plant, many generating sets have been carried out central controlled voltage power-less automatic control system, a cover voltage wattless automatic control device is installed by this system in a power plant, by the direct regulator generator magnetizing exciter of this device working voltage pulse, the data of utilizing the RTU of power plant to gather realize the closed-loop adjustment of multiple voltage and idle amount in the power plant, can also control the switching of low tension reactor in the power plant.The system that provides according to the present invention, same thermal power plant only need install a voltage wattless automatic control device many generators and a plurality of low tension reactor are carried out centralized control, can realize that multicomputer optimization is regulated in the power plant to the idle secondary distribution of carrying out of many generators in the thermal power plant, the working voltage pulse signal directly inserts generator exciter, in power plant, realize setting voltage or idle closed-loop adjustment, abundant monitor mode and the interface that the operations staff of power plant can pass through to be provided is monitored and operations necessary system, is provided with the implementation status of uploading the idle setting command of being received of power station voltage with the communication interface of electrical network automatic voltage control system.
The idle automatic control system of this power station voltage only needs to install a voltage wattless automatic control device in same thermal power plant, this device can be regulated many generators in the thermal power plant simultaneously, can also carry out the switching operation to the low tension reactor in the power plant.In this power station voltage wattless automatic control device, the idle allocation algorithm of many generators in the power plant can be set, (equate according to the specific idle method of salary distribution as machine end output reactive power, or generator power factor phase or the like) each generator is regulated, realize that the optimization of many generating sets is regulated.
In the idle automatic control system of this power station voltage, the power station voltage wattless automatic control device directly inserts generator exciter with the voltage pulse signal that generates, and each generator is increased and decreased excitation regulation.Because nearly all generator exciter all has potential pulse to insert empty node, so this cut-in method almost is applicable to all generator exciters.And the power station voltage wattless automatic control device can carry out communication with the RTU of power plant, obtain the voltage power-less real time information of power plant by the RTU of power plant, monitoring is to the regulating effect of generator exciter and entire power plant system in real time, realization is to specific voltage or idle closed-loop adjustment, this specific voltage or idle can be set end voltage, machine end output reactive power, high voltage bus voltage, high voltage bus reactive power etc.To the switching operation of low tension reactor, also finish by potential pulse.
In the idle automatic control system of this power station voltage, the user-machine interface that the idle running status of multiple supervision power station voltage is arranged, the electric power supply plant operations staff monitors running status, and multiple operations staff's operation-interface is provided, and the confession operations staff intervenes running situation when being necessary and operates.The power station voltage wattless automatic control device can also carry out communication with the electrical network automatic voltage control system in this system, upload the implementation status of the regulation and control instruction that electrical network automatic voltage control system that power plant receives issues, the usefulness of power supply network automatic voltage control system supervision.
After adopting so idle automatic control system of power station voltage, only need to install the regulation and control that can realize many generators and a plurality of low tension reactors in the power plant once the cover voltage wattless automatic control device in thermal power plant, the operations staff of power plant does not need to safeguard simultaneously many complete equipments.After the voltage wattless automatic control device of installing receives the regulating command that the electrical network automatic voltage control system issues, if whole factory's high voltage bus voltage or idle regulating command, can be by the optimized distribution algorithm that sets, according to optimizing the optimization adjusting that rule realizes many generators in the power plant, guarantee that many generator operations of power plant are at more rational state.Voltage wattless automatic control device increases and decreases excitation regulation by voltage pulse signal to generator exciter, by increase and decrease excitation regulation to generator exciter, can increase and decrease the set end voltage of generator, and then output reactive power that can regulator generator, thereby the voltage of regulating station's high voltage bus and reactive power.In adjustment process, voltage wattless automatic control device can obtain voltage power-less information in generator state information and the power plant in real time by the RTU of power plant, the regulating effect of each voltage-regulation pulse that monitoring is at any time issued, thereby realize specific voltage or specific idle closed-loop adjustment are improved degree of regulation.If what the power station voltage wattless automatic control device received is the instruction of low tension reactor switching, then after the operations staff of power plant agrees execution command, send the switching operation that specific potential pulse is finished this low tension reactor.In adjustment process, the operations staff of power plant can be at any time the ruuning situation of surveillance in several ways, can intervene adjustment process by the multiple interfaces and the mode of operation that set when being necessary.Simultaneously, voltage wattless automatic control device can be real-time feeds back to the electrical network automatic voltage control system with the implementation status of the regulating command of being received, is convenient to the electrical network automatic voltage control system and monitors.
Therefore, the idle automatic control system of passing through to be invented of this cover power station voltage, can improve the voltage power-less automatic control level of power plant greatly, economy realizes that easily the voltage power-less in the power plant controls automatically, easy maintenance is regulated accurately, can not influence the operation of power plant's existing system, and complete function is abundant, can guarantee the security reliability of system.
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is a general structure schematic diagram of the present invention.
Fig. 2 is a power station voltage wattless automatic control device structural representation involved in the present invention.
Fig. 3 is a power station voltage wattless automatic control device regulation and control potential pulse generating portion winding diagram involved in the present invention.
In the idle automatic control system of power station voltage shown in Figure 1, the core is the power station voltage wattless automatic control device that is installed in the power plant telemechanical chamber (also can be installed on net control office), and the such device of a cover need be installed by each power plant.Between this device and electrical network automatic voltage control system server, need to set up communication channel (path 1.), upload the situation that power plant carries out the regulation and control instruction of being received for power plant and power station voltage wattless automatic control device so that the electrical network automatic voltage control system issues control command.This path is generally the special optic fibre path, when opening this path, may need the modulator-demodulator (modem) that uses optical-electrical converter and carry out the data pattern conversion.Need to set up communication channel (path 2.) between power station voltage wattless automatic control device and the RTU of power plant, so that the power station voltage wattless automatic control device obtains the service data of power plant.At power plant's master-control room (or the long chamber of value) monitoring computer (monitoring PC) that the idle automatic control system ruuning situation of power station voltage is monitored can be installed, need to make up special-purpose communication channel (path 3.) between this monitoring PC and power station voltage wattless automatic control device.Between power station voltage wattless automatic control device and the RTU of power plant, maybe during hypertelorism between the PC of this device and monitoring, can use optical cable set up needed path 2. with path 3., corresponding, need to use serial ports light cat or the network interface light cat that carries out communication.5. 4. path be respectively that the power station voltage wattless automatic control device will be regulated and control the signal path that potential pulse is handed down to generator exciter and mortgage reactor with path, (as hundreds of rice) can use shielded type cable to set up when close together, and (km in full) needs to use optical cable to set up when distance is too far away.4. path needs transmission to increase excitation and excitation reduction two independent signal, and 5. path needs to transmit throws reactor and cut reactor two independent signal.When using shielded type cable, every road signal demand use just (+) is followed cable with negative (-) two, so 4. and 5. path all needs four cables to transmit voltage pulse signal respectively; When using optical cable, need to use corresponding supporting smooth cat to carry out opto-electronic conversion, 4. and 5. path all needs the two-way optical fibre channel respectively.
In the power station voltage wattless automatic control device shown in Figure 2, mainly can be divided into protocol conversion part, order and data processing section and regulation and control potential pulse generating portion.The capital equipment of protocol conversion part is a protocol machine, mainly finishes the function of regulation and control order reception, power plant's Data Receiving and command execution situation data upload.The electrical network automatism voltage control that this protocol machine receiving system Communication Layer is transmitted refers to life, receives the inner real-time running data of power plant that the RTU of power plant gathers, and the idle automatic control system implementation status of power station voltage data are sent back to the control centre main website.Protocol machine mainly uses N4F stipulations, 101 stipulations and 104 stipulations.The major function of command process part is the core algorithm that operation generates electric power factory equipment regulation and control order, and system's related data is stored in the database.Here the core algorithm that is adopted need be taken all factors into consideration the running status of power plant, potential pulse regulation and control orders such as the excitation regulation of the suitable power plant of generation actual operating, reactor switching on the basis of the stability that keeps system.Regulation and control potential pulse generating portion mainly is made up of signaling conversion circuit and order output circuit, its task is the control signal that the pulse signal that will regulate exciter and control reactor resolves to corresponding excitation controlling device, reactor switching device actual needs, and issue control signal by corresponding circuit, realize operation and regulation and control to these devices.This part mainly comprises pressing plate, impulse controller, light cat pond etc.Pressing plate is a kind of hardware protection device, can in case of emergency manually disconnect, and issuing of pulse regulated and control in blocking-up.Impulse controller is the equipment that the control impuls that designs voluntarily issues, and its effect is that the adjusting command with controllable device is converted into the directly pulse signal of control appliance action.Light cat pond is an optical communication equipment, form by several RS232 serial ports light cats and network interface light cat, it mainly is the photoelectric converting function of (path among Fig. 1 1. 2. 3. 4. 5.) when realizing power station voltage wattless automatic control device and miscellaneous equipment communication, this light cat pond is an optional equipment, too far away at communication distance, be equipped with when needing to use optical-fibre communications.
Power station voltage wattless automatic control device shown in Figure 3 regulation and control potential pulse generating portion is when two generators and two low tension reactors are installed in the thermal power plant, and the circuit interconnect pattern of the pulse generating portion during directly by shielded type cable transmission voltage pulse signal.This part is to realize isolation, amplification and the output of regulating and controlling voltage pulse every power amplification circuit (1AP) and pressing plate (1SB-6SB, wherein 5SB and 6SB are standby), solid-state relay (1KM-8KM) by light.When control greater power generation machine and more low tension reactor, need corresponding more pressing plate and the solid-state relay of increasing; When apart from too far away, when needing to use optical cable to transmit voltage pulse signal, can save solid-state relay, but need increase to isolate and power amplification circuit on the generator exciter side.After the PCI pulse output board generation of voltage pulse signal by order and data processing section, carry out photoelectricity isolation, power amplification through light every power amplification circuit (1AP), link to each other with solid-state relay by pressing plate, driving solid relay, the high-pressure side of control solid-state relay opens and closes, thereby control inserts the disconnection and the closure of the empty node of generator exciter, is equal to generator exciter has been imported correspondent voltage pulse regulation signal, thereby regulator generator magnetizing exciter.This pressing plate can be used in case of emergency manually disconnecting the regulating impulse of sending into generator exciter, guarantees the fail safe of system.
Claims (7)
1. one kind is carried out central controlled voltage power-less automatic control system to many generating sets and a plurality of low tension reactor in thermal power plant, a voltage wattless automatic control device is installed by this system in a power plant, by the direct regulator generator magnetizing exciter of this device working voltage pulse, the data of utilizing the RTU of power plant to gather realize closed-loop adjustment in the factory, can also the working voltage pulse carry out the switching operation simultaneously to low tension reactor, it is characterized in that: same thermal power plant only need install a voltage wattless automatic control device many generators and a plurality of low tension reactor are carried out centralized control, can realize that multicomputer optimization is regulated in the power plant to the idle secondary distribution of carrying out of many generators in the thermal power plant, the working voltage pulse signal directly inserts generator exciter, in power plant, realize setting voltage or idle closed-loop adjustment by the RTU of power plant, abundant monitor mode and the interface that the operations staff of power plant can pass through to be provided is monitored and operations necessary system, is provided with the implementation status of uploading the regulation and control order of being received with the communication interface of electrical network automatic voltage control system.
2. according to the idle automatic control system of the described power station voltage of claim 1, it is characterized in that: described voltage wattless automatic control device can be controlled many generators and a plurality of low tension reactor in the same thermal power plant simultaneously, and the such device of a cover only need be installed by a thermal power plant.
3. according to the described voltage wattless automatic control device of claim 2, it is characterized in that: this device can guarantee that according to the principle of optimality that sets the optimization of multicomputer is regulated to many idle secondary distribution of carrying out of generator output of thermal power plant.
4. according to the idle automatic control system of the described power station voltage of claim 1, it is characterized in that: described voltage wattless automatic control device working voltage pulse signal directly inserts generator exciter, generator exciter is increased and decreased excitation regulation, also be to use voltage pulse signal to control low tension reactor.
5. according to the idle automatic control system of the described power station voltage of claim 1, it is characterized in that: described voltage wattless automatic control device obtains power plant's real-time running data from the RTU of power plant, obtain feedback information, can realize specific voltage or idle closed-loop adjustment to the regulating effect of generator exciter.
6. according to the idle automatic control system of the described power station voltage of claim 1, it is characterized in that: the idle automatic control system of described power station voltage can provide the user-machine interface of the idle running status of multiple supervision power station voltage, the electric power supply plant operations staff monitors running status, and multiple operations staff's operation-interface is provided, and the confession operations staff intervenes running situation when being necessary and operates.
7. according to the idle automatic control system of the described power station voltage of claim 1, it is characterized in that: described voltage wattless automatic control device can carry out communication with the electrical network automatic voltage control system, upload the implementation status of the regulation and control instruction that electrical network automatic voltage control system that power plant receives issues, the usefulness of power supply network automatic voltage control system supervision.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510070A (en) * | 2011-11-09 | 2012-06-20 | 北京四方继保自动化股份有限公司 | Method for realizing automatic voltage closed-loop control of power plant by taking powder factor as control target |
| CN104022519A (en) * | 2014-06-20 | 2014-09-03 | 国网上海市电力公司 | Centralized control pulse type voltage reactive automatic control system and method for thermal power plant |
| CN104319788A (en) * | 2014-10-17 | 2015-01-28 | 安徽立卓智能电网科技有限公司 | Reactive power control system and control method for power station |
| CN108512246A (en) * | 2018-03-08 | 2018-09-07 | 上海阜有海洋科技有限公司 | FIQ-F-P cooperates with MIMO control systems and control method |
-
2008
- 2008-02-22 CN CNA2008100072767A patent/CN101515720A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510070A (en) * | 2011-11-09 | 2012-06-20 | 北京四方继保自动化股份有限公司 | Method for realizing automatic voltage closed-loop control of power plant by taking powder factor as control target |
| CN104022519A (en) * | 2014-06-20 | 2014-09-03 | 国网上海市电力公司 | Centralized control pulse type voltage reactive automatic control system and method for thermal power plant |
| CN104319788A (en) * | 2014-10-17 | 2015-01-28 | 安徽立卓智能电网科技有限公司 | Reactive power control system and control method for power station |
| CN108512246A (en) * | 2018-03-08 | 2018-09-07 | 上海阜有海洋科技有限公司 | FIQ-F-P cooperates with MIMO control systems and control method |
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