CN111694332A - Control method for load side control of sugar refinery single machine system fluctuation - Google Patents
Control method for load side control of sugar refinery single machine system fluctuation Download PDFInfo
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- CN111694332A CN111694332A CN202010510269.XA CN202010510269A CN111694332A CN 111694332 A CN111694332 A CN 111694332A CN 202010510269 A CN202010510269 A CN 202010510269A CN 111694332 A CN111694332 A CN 111694332A
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- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 239000013589 supplement Substances 0.000 abstract description 2
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/4184—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by fault tolerance, reliability of production system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention relates to the field of engineering equipment control, in particular to a control method for controlling the load side of sugar refinery single machine system fluctuation. The invention aims to control the synchronous speed increase of a plurality of devices among groups, destroy the synchronization by controlling the speed-increased devices to reduce the speed to low-speed operation and simultaneously compensate double times of rated power of the controlled devices to a system, thereby being capable of rapidly improving the power shortage of the system, accelerating the system frequency to be normal, effectively solving the contradiction between the number of groups generated by device grouping and the productivity in the prior art, serving as an effective supplement in the prior art and effectively stopping the loss of the system before danger occurs.
Description
Technical Field
The invention relates to the field of engineering equipment control, in particular to a control method for controlling the load side of the fluctuation of a sugar refinery single machine system.
Background
The power system of the sugar refinery is a 10kV single-turbine power generation system, the operation frequency of the power system is greatly influenced by load fluctuation, particularly, a 10-piece 250kW large-scale centrifugal machine is arranged in the power plant, and the work mode of the power system is short-period frequency conversion four-quadrant operation, so that the steam turbine with the frequency exceeding the standard or the electric brake opening are caused for many times.
The 10 centrifuge devices do not operate in isolation, and the presently preferred solution is to group the devices electrically interlocked in order to ensure that each group of devices does not operate in synchronization to avoid impacting the grid. The plant currently divides 10 devices into 4 groups, the number of groups being determined by a trade-off: the number of the groups is small, the impact on the power grid is small but the capacity is influenced, and the opposite is true if the number of the groups is large.
4 groups of inter-group equipment are not interlocked, 1, 2, 3 or 4 inter-group equipment are synchronized, each power is 250kW, and the fluctuation value of the equipment in reversible operation is 250- (-250) ═ 500kW, so that the daily fluctuation range can reach 500-2000 kW. When a plurality of devices among control groups synchronously increase the speed, the conventional scheme cannot quickly improve the power shortage of the system and cannot accelerate the system frequency to be increased to be normal.
Disclosure of Invention
The problem that the power shortage of the system cannot be rapidly improved and the system frequency cannot be accelerated to be normal when a plurality of devices among control groups are synchronously accelerated in the conventional scheme is solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method for controlling the fluctuating load side of a single machine system of a sugar refinery comprises an overhaul distribution box, a frequency control box and a power control box, wherein an external power supply is connected with the common end of the overhaul distribution box, the output end of the overhaul distribution box is connected with the input end of the frequency control box, the output end of the frequency control box is connected with the power control box, the power control box is electrically connected with an n # separator control loop for controlling electrical equipment, a plurality of centrifuge equipment for load monitoring are selected, a load envelope curve is defined for each selected centrifuge equipment and stored in the n # separator control loop for controlling the electrical equipment, the load envelope curve defines the maximum output load capacity of the centrifuge equipment according to the power of the corresponding centrifuge equipment, the load on the selected centrifuge equipment is directly or indirectly monitored, and a corresponding load signal is generated, the load signal is transmitted to the n # separator control loop, the n # separator control loop for electrical equipment control is used to determine whether the load acting on each selected centrifuge device is within a corresponding load envelope on the centrifuge device, and the n # separator control loop initiates corrective action when the load on any selected centrifuge device exceeds the load envelope of the component, the corrective action initiated by the n # separator control loop including reducing the load on the corresponding component, the corrective action tailored to the corresponding centrifuge device to reduce the load as appropriate, the corrective action including any combination of alerting, braking, stalling, or shutting down the centrifuge device, the load envelope designed to be equal to or close to the design load capacity of the centrifuge device, but below a load that could cause catastrophic failure of the centrifuge device, the n # splitter control loop calculating the power or frequency from the received load signal, the load envelope being stored as a separate corresponding module within the n # splitter control loop, any of the modules being replaceable or modifiable, the load envelope being adjusted according to component run time, the n # splitter control loop including one or more controllers operable to provide instructions to each of a first centrifuge device or an nth centrifuge device, wherein the instructions cause the first centrifuge device or the nth centrifuge device to turn or apply a braking function, the controller including a first encoder or an nth encoder associated with the first centrifuge device or the nth centrifuge, the first encoder or the nth encoder is operable to detect information about a payload envelope of the first centrifuge device or the nth centrifuge, the one or nth controller is configured to receive information from one or more of the first encoder and the nth encoder, and based on the received information, provide instructions to one or more of the first centrifuge device or the nth centrifuge to adjust one or more of a current frequency of the payload envelope, a current power of the payload envelope, the controller interfacing with the instructions of the information about the payload envelope of the centrifuge, the information about the payload envelope of the centrifuge including a first end and a second end, the first end coupled to the centrifuge device main motor, and the second end configured to be coupled to the payload.
Preferably, the overhaul distribution box is connected with an external power supply, an A phase and an N phase of the overhaul distribution box control power supply are connected, and an output signal is transmitted to the frequency control box.
Preferably, the frequency control box is used for judging the out-of-limit frequency.
Preferably, the frequency control box controls the power control box through an under-frequency starting signal.
Preferably, the power control box determines the magnitude and direction of power.
Preferably, the device further comprises an n # separator frequency converter, and the output end of the n # separator frequency converter is connected with the input end of the power control box.
Preferably, the n # separator frequency converter is used as a collection point for collecting the magnitude and direction of the electric power entering the separator frequency converter.
Preferably, the n # separator frequency converter can collect single-strand C-phase current on the inlet side.
Preferably, the n # separator frequency converter can collect the C-phase voltage + PE at the inlet line side.
Preferably, the power control box controls the n # separator control circuit through control action signals output by a plurality of groups of control circuits.
Compared with the prior art, the invention has the following advantages:
the invention aims to control the synchronous speed rise of a plurality of devices among groups (at the moment, the frequency is lower than 48Hz), destroy the synchronization by controlling the speed rise devices to reduce the speed to the low speed for operation, simultaneously compensate the double times of the rated power of the controlled devices to the system, quickly improve the power shortage of the system, accelerate the frequency rise of the system to be normal, effectively solve the contradiction between the number of groups generated by device grouping and the productivity in the prior art, as the effective supplement of the prior art, effectively stop the loss of the system before the danger occurs, and realize the reverse power by the special implementation mode of the low-cycle load reduction mode of a single-machine system.
Drawings
FIG. 1 is a schematic diagram of load-side control of stand-alone system fluctuation in the method for controlling load-side control of stand-alone system fluctuation in a sugar refinery according to the present invention.
The labels in the figure are: 1. the power distribution box comprises an overhaul distribution box 2, a frequency control box 3 and a power control box.
Detailed Description
To further explain the technical scheme of the control method for controlling the load side of the sugar refinery single machine system fluctuation, the specific implementation manner of the technical scheme of the control method for controlling the load side of the sugar refinery single machine system fluctuation is described as follows with reference to the accompanying drawings:
the technical scheme of the control method for controlling the fluctuating load side of the sugar refinery single machine system comprises an overhauling distribution box 1, a frequency control box 2 and a power control box 3, wherein an external power supply is connected with a public end of the overhauling distribution box 1, an output end of the overhauling distribution box 1 is connected with an input end of the frequency control box 2, the overhauling distribution box 1 is connected with the external power supply, A phase and N phase of the power supply of the overhauling distribution box 1 are controlled, an output signal is transmitted to the frequency control box 2, the frequency control box 2 is used for distinguishing the out-of-limit frequency, and the frequency is distinguished: the device power supply and frequency sampling is carried out on A and N phases of an overhaul box, the frequency is lower than a fixed value of 48Hz, the time delay is 2s, an output contact is opened, 10 separator power control box total starting signals are provided, the output end of the frequency control box 2 is connected with a power control box 3, the output end of an N # separator frequency converter is connected with the input end of the power control box 3, the N # separator frequency converter is used as a collecting point for collecting the electric power entering the separator frequency converter, the N # separator frequency converter can collect C-phase single-stranded current at the inlet side and also can collect C-phase voltage + PE at the inlet side, the frequency control box 2 controls the power control box 3 through an under-frequency starting signal, the power control box 3 distinguishes the size and the direction of the power, and the size and the direction of the power are distinguished: c-phase voltage and current signals of the inlet side of each separator frequency converter are collected, low-frequency signal starting power is used for judging, each separator has the same independent group of judging functions, and the criterion is as follows: when a low-frequency total signal is started and the separator runs to 180kW and has forward power, 2s of delay output signals are sent to a control loop of the separator to enable the separator to immediately change to speed reduction running, a power control box 3 is electrically connected with an n # separator control loop for controlling electrical equipment, the power control box controls the n # separator control loop through control action signals output by a plurality of groups of control loops, the number of the 10 separators which act and generate power to run reversely is 1-4, the function can play a certain interference role in daily running of the separator, and therefore low-frequency and power fixed values are combined with a shutdown boundary experience value and give a certain reliability coefficient. The above-mentioned fixed values are merely examples and do not represent that an actual system would be adopted. A plurality of centrifuge devices for load monitoring are selected. A load envelope is defined for each selected centrifuge device and stored in the n # separator control loop, which defines a maximum acceptable load capacity for the corresponding centrifuge device, which may be equal to or near the design capacity of the centrifuge device, for example. The method includes the steps of directly or indirectly monitoring the load on selected centrifuge devices and generating corresponding load signals, which are transmitted to an n # separator control loop, determining by the n # separator control loop whether the load acting on each selected centrifuge device is within the corresponding load envelope of the component, and initiating corrective action when the load acting on any selected centrifuge device exceeds the load envelope of the centrifuge device. In addition, the load envelope may be adjusted based on component operating time, and the centrifuge device payload control system may also include a line sensor positioned on the payload envelope. The line sensor is operable to detect information about the payload envelope, and suitable information that may be detected by the line sensor includes any information that may be used by one or more controllers of the centrifuge device payload envelope. Information detected by the line sensor is used by other components of the centrifuge device payload envelope control system. Information detected by the line sensor may be sent to one or more controllers of the on-board payload control system, and the line sensor may continuously or periodically detect information about the payload envelope. The line sensor may continuously detect information about the payload envelope and make such real-time information available to one or more components of the centrifuge device payload control system. The line sensor may periodically (e.g., every second) detect information about the payload envelope. The line sensor detects and relays real-time information. And the control of the payload envelope and/or payload is more accurate when detecting real-time information than when using periodic information. In some embodiments, the line sensor is under the direction and/or control of the controller. For example, the controller may control the operation of the line sensor. In such embodiments, the controller may instruct the line sensor when to begin detecting information about the payload envelope. The controller may also indicate when the line sensor shares the detected information or with what components. The centrifuge device payload control system may also include one or more controllers as described above. The centrifuge device payload control system includes a single controller. One or more components of the centrifuge device payload control system may include a controller. The first controller and the nth controller may be configured to receive data from one or more other components of the centrifuge device payload control system. For example, the first controller and the nth controller may receive information about the payload envelope from the line sensor and may receive information about the payload envelope from the tracking and control system. In response to determining to feed the payload envelope, the controller may instruct the centrifuge device to start and stop. In addition to indicating the motor with respect to the direction of rotation, the one or more controllers may also indicate that the motor is rotating at a particular rate.
The invention is not limited to the precise arrangements described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A control method for controlling the fluctuating load side of a sugar refinery single machine system is characterized in that: the load monitoring system comprises an overhaul distribution box, a frequency control box and a power control box, wherein an external power supply is connected with a public end of the overhaul distribution box, an output end of the overhaul distribution box is connected with an input end of the frequency control box, an output end of the frequency control box is connected with the power control box, the power control box is electrically connected with an n # separator control loop used for controlling electrical equipment, a plurality of centrifuge equipment used for load monitoring are selected, a load envelope curve is defined for each selected centrifuge equipment and stored in the n # separator control loop used for controlling the electrical equipment, the load envelope curve defines the maximum output load capacity of the centrifuge equipment according to the power of the corresponding centrifuge equipment, the load on the selected centrifuge equipment is directly or indirectly monitored and a corresponding load signal is generated and transmitted to the n # separator control loop, determining, using the n # separator control loop for electrical equipment control, whether the load acting on each selected centrifuge device is within a corresponding load envelope on the centrifuge device, and the n # separator control loop initiating corrective action when the load on any selected centrifuge device exceeds the load envelope of the component, the corrective action initiated by the n # separator control loop including reducing the load on the corresponding component, the corrective action tailored to the corresponding centrifuge device to reduce the load as appropriate, the corrective action including any combination of alerting, braking, stalling, or shutting down the centrifuge device, the load envelope designed to be equal to or close to the design load capacity of the centrifuge device, but below a load that would cause catastrophic failure of the centrifuge device, the n # splitter control loop calculating the power or frequency from the received load signal, the load envelope being stored as a separate corresponding module within the n # splitter control loop, any of the modules being replaceable or modifiable, the load envelope being adjusted according to component run time, the n # splitter control loop including one or more controllers operable to provide instructions to each of a first centrifuge device or an nth centrifuge device, wherein the instructions cause the first centrifuge device or the nth centrifuge to turn or apply a braking function, the controller including a first encoder or an nth encoder associated with the first centrifuge device or the nth centrifuge, the first encoder or the nth encoder operable to detect an effective load envelope for the first centrifuge device or the nth centrifuge The one or nth controller configured to receive information from one or n of the first encoder and the nth encoder and, based on the received information, provide instructions to one or more of the first centrifuge device or the nth centrifuge to adjust one or more of a current frequency of the payload envelope, a current power of the payload envelope, the controller receiving instructions for information of the payload envelope of the centrifuge, the information of the payload envelope of the centrifuge including a first end and a second end, the first end coupled to the centrifuge device main motor, and the second end configured to be coupled to the payload.
2. The method for controlling the load-side control of sugar mill stand-alone system fluctuation according to claim 1, wherein: the overhaul distribution box is connected with an external power supply, an A phase and an N phase of the overhaul distribution box control power supply are maintained, and an output signal is transmitted to the frequency control box.
3. The method for controlling the load-side control of sugar mill stand-alone system fluctuation according to claim 1, wherein: and the frequency control box is used for judging the out-of-limit frequency.
4. The method for controlling the load-side control of sugar mill stand-alone system fluctuations according to claim 1, characterized in that; and the frequency control box controls the power control box through an under-frequency starting signal.
5. The method for controlling the load-side control of sugar mill stand-alone system fluctuation according to claim 1, wherein: and the power control box judges the magnitude and the direction of the power.
6. The method for controlling the load-side control of sugar mill stand-alone system fluctuation according to claim 1, wherein: the output end of the n # separator frequency converter is connected with the input end of the power control box.
7. The method for controlling the load-side control of sugar mill stand-alone system fluctuation according to claim 6, wherein: the n # separator frequency converter is used as a collection point for collecting the size and the direction of the power consumption entering the separator frequency converter.
8. The method for controlling the load-side control of sugar mill stand-alone system fluctuation according to claim 7, wherein: the n # separating machine frequency converter can collect single-stranded C-phase current on the incoming line side.
9. The method for controlling the load-side control of sugar mill stand-alone system fluctuation according to claim 7, wherein: the n # separator frequency converter can collect the C-phase voltage + PE at the inlet wire side.
10. The method for controlling the load-side control of sugar mill stand-alone system fluctuation according to claim 1, wherein: and the power control box controls the n # separator control loop through control action signals output by a plurality of groups of control loops.
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| CN202010510269.XA CN111694332A (en) | 2020-06-08 | 2020-06-08 | Control method for load side control of sugar refinery single machine system fluctuation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112517254A (en) * | 2020-11-25 | 2021-03-19 | 中粮糖业辽宁有限公司 | Control method for group interlocking time of separators in large-scale sugar refinery |
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Application publication date: 20200922 |