CN112564515A - 560kA aluminum electrolysis power supply system based on switching control and control method thereof - Google Patents
560kA aluminum electrolysis power supply system based on switching control and control method thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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Abstract
The invention relates to a 560kA aluminum electrolysis power supply system based on switching control and a control method thereof. The invention relates to the technical field of aluminum electrolysis equipment and control technology thereof, wherein the system comprises an upper computer control system, a field control system, a communication system and a monitoring and backup system; the invention adopts a parallel output mode of 7 machine sets under the working condition, the total installed quantity of each system is 80kA, the 560kA output of the system is realized, the output precision of the system is eight per thousand, the output precision of a single cabinet is one per thousand, the total output current setting of a PLC (programmable logic controller) receiving the upper computer is compared with the total output Hall current value measured by the total output direct current bus, if the output error is more than eight per thousand, the adjustment value is calculated, after the calculated adjustment result is compared with the sampling value of a single machine set output Hall current sensor, the single machine set output error is more than one per thousand, the adjustment value is sent to the corresponding machine set. And real-time monitoring and comparison are carried out, and field control is realized.
Description
Technical Field
The invention relates to the technical field of aluminum electrolysis equipment and control technology thereof, in particular to a 560kA aluminum electrolysis power supply system based on switching control and a control method thereof.
Background
China is a large aluminum country, and safe and efficient large-scale aluminum product manufacturing is one of the hot problems of research. With the current used in the electrolytic aluminum being improved in recent years, the robustness of the power for aluminum electrolysis and the reliability of the system become important evaluation indexes of the system. Once the output current fluctuates in a large range or even goes down, the aluminum electrolysis enterprises are caused to suffer huge loss.
Disclosure of Invention
The invention provides a 560kA aluminum electrolysis power supply system based on switching control and a control method thereof for realizing 560kA direct current with high precision, high robustness and high reliability for industrial production of aluminum electrolysis, and the invention provides the following technical scheme:
a560 kA aluminum electrolysis power supply system based on switching control comprises an upper computer control system, a field control system, a communication system and a monitoring and backup system;
the field control system comprises a master dispatching system and eight single cabinet control systems with 80kA power capacities, the eight single cabinet control systems with 80kA power capacities are connected in a star-shaped structure through profibus, the field control system adopts a master dispatching PLC, the master dispatching PLC is taken as a central node and is respectively connected with the eight single cabinet systems, and the communication system adopts an Ethernet switch;
the upper computer control system and the general dispatching PLC carry out remote communication and instruction issuing through an LAN interface of the Ethernet switch;
the monitoring and backup system comprises a monitoring backup station 1, a monitoring backup station 2, a GPS receiver and a printer, and local area network connection is carried out through an LAN interface, wherein the monitoring backup stations 1 and 2 receive GPS time service and positioning service and record parameters returned by a field control system, and the monitoring backup stations 1 and 2 are dual-computer hot backup and are remote backup and respectively control the printer to record the parameters.
Preferably, in the eight 80kA power capacity single cabinet control systems, the No. 1-7 single cabinet is a working single cabinet, the No. 8 single cabinet is a standby single cabinet, and when the master control PLC determines that the No. 1-7 single cabinet is in an abnormal working state, the abnormal working single cabinet is disconnected and the No. 8 single cabinet is connected to perform fault bit supplementing.
Preferably, one end of each of the eight 80kA power capacity single cabinet control systems is mounted on a 220kV alternating current bus, the other end of each of the eight 80kA power capacity single cabinet control systems is directly connected in parallel for output, and a hall current sensor is mounted on the output side of the direct current bus and connected with a general regulation PLC.
Preferably, the single 80kA power capacity single cabinet control system comprises a unit rectifier transformer, a cabinet A, a cabinet B unit output bus and a single unit output current sensor, and the cabinet A comprises a cabinet A control system, a cabinet A rectifier system and a cabinet A output current hall sensor; the B cabinet comprises a B cabinet control system, a B cabinet rectification system and a B cabinet output current Hall sensor;
the primary coil of the rectifier transformer of the unit adopts a zigzag connection mode, four groups of windings are shared by the secondary side, the four groups of windings are respectively output in a positive and negative star connection mode and a positive and negative triangle connection mode, the positive and negative star output windings enter respective rectifier bridges after being respectively connected with the saturable reactor, and finally are connected in parallel to form in-phase and inverse parallel output;
the A cabinet rectifying system is connected with the positive and negative star-shaped winding, and the B cabinet rectifying system is connected with the positive and negative triangular winding; the output equivalent pulse wave number of the cabinet A is 12 pulse waves, the output of the cabinet B is also 12 pulse waves, the output of the cabinet A and the output of the cabinet B are connected in parallel and then are output by a single unit, the output equivalent pulse wave number of the unit is 24 pulse waves, the circular edge of each unit adopts a zigzag winding to change the output phase of the unit, and the output equivalent pulse wave number of 7 units of the system is 168 pulse waves.
Preferably, the rectification systems of the A cabinet and the B cabinet adopt the same structure and are composed of six groups of connected saturable reactors and a three-phase full-bridge rectification circuit, and offset windings of the six groups of saturable reactors are connected in series and then used as loads to be supplied with power by a control system circuit.
A unit redundancy operation control method of synchronous echelon replacement includes the steps of firstly detecting output current, detecting output voltage of DCDC after PLC when current output accuracy is larger than one thousandth, quickly regulating and controlling the output voltage of PLC through a segmented PI switching control algorithm, controlling current value passing through a saturable reactor offset winding by controlling output voltage of a DC-DC circuit, and further controlling output current of a rectifier unit.
Preferably, when the output voltage of the DC-DC converter of the single cabinet control system is 0-VconirolThe output voltage is divided into N sections, and in the voltage section VM-1～VMAn internal fixed parameter PI regulator with a regulator parameter [ PM IM]The N-segment voltage has N groups of parameters, and is expressed as: [ P ]1 I1]、[P2 I2]...[PM IM]...[PN IN](ii) a The single-cabinet controller realizes the output fast switching control by acquiring the output voltage of the DC-DC converter of the control system.
Preferably, fixed parameters in voltage segments are adopted, PI values in different intervals are rapidly switched, the system is rapidly started, the starting safety and stability are higher, the current regulation and control under variable load also has higher response speed, and efficient current regulation is realized.
Preferably, after 3-5 total-debugging PLC instruction cycles, if a certain cabinet still cannot achieve the current value output below the thousandth error, the cabinet is determined to be in an abnormal working state, the cabinet is determined to be in a fault, a fault code is sent, and a fault bit-complementing process is carried out.
Preferably, a cold start to cabinet # 8 is first performed; and then, synchronous control of the fault cabinet and the No. 8 cabinet is carried out, namely, gradual function replacement of output current is carried out, the output current of the fault cabinet is increased by 10% in each function replacement period, and the output current of the position-complementing cabinet is increased by 10% at the same time.
The invention has the following beneficial effects:
under the working condition of the invention, a parallel output mode of 7 units is adopted, the total installed amount of each system is 80kA, 560kA output of the system is realized, the output precision of the system is eight thousandths, and the output precision of a single cabinet is one thousandth. The output current value, the output precision and the response speed of the device are all superior to those of the prior art.
And the master PLC receives the total output current setting of the upper computer and compares the total output Hall current value measured by the total output direct current bus, if the output error is more than eight per thousand, the sub-regulation value is calculated, after the calculated sub-regulation result is compared with the sampling value of the single unit output Hall current sensor, the single unit output error is more than one per thousand, and the sub-regulation value is sent to the corresponding unit. And real-time monitoring and comparison are carried out, and field control is realized.
Drawings
FIG. 1 is a schematic structural diagram of a 560kA aluminum electrolysis power supply system based on switching control;
FIG. 2 is a schematic diagram of a multi-unit parallel output structure;
FIG. 3 is a schematic diagram of a single unit circuit structure;
FIG. 4 is a flow chart of system redundancy control;
FIG. 5 is a flow chart of system fault bit-filling;
FIG. 6 is a system control schematic;
FIG. 7 is a schematic diagram of a single unit control;
FIG. 8 is a schematic diagram of a single cabinet switching control algorithm.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The first embodiment is as follows:
as shown in fig. 1 to 8, the present invention provides a 560kA aluminum electrolysis power supply system based on switching control and a control method thereof:
a560 kA aluminum electrolysis power supply system based on switching control comprises an upper computer control system, a field control system, a communication system and a monitoring and backup system;
the field control system comprises a master dispatching system and eight single cabinet control systems with 80kA power capacities, the eight single cabinet control systems with 80kA power capacities are connected in a star-shaped structure through profibus, the field control system adopts a master dispatching PLC, the master dispatching PLC is taken as a central node and is respectively connected with the eight single cabinet systems, and the communication system adopts an Ethernet switch;
the upper computer control system and the general dispatching PLC carry out remote communication and instruction issuing through an LAN interface of the Ethernet switch;
the monitoring and backup system comprises a monitoring backup station 1, a monitoring backup station 2, a GPS receiver and a printer, and local area network connection is carried out through an LAN interface, wherein the monitoring backup stations 1 and 2 receive GPS time service and positioning service and record parameters returned by a field control system, and the monitoring backup stations 1 and 2 are dual-computer hot backup and are remote backup and respectively control the printer to record the parameters.
And when the master control PLC judges that the No. 1-7 single cabinet is in an abnormal working state, the abnormal working single cabinet is disconnected and the No. 8 single cabinet is connected in for fault position compensation.
One end of each of the eight 80kA power capacity single cabinet control systems is mounted on a 220kV alternating current bus, the other end of each of the eight 80kA power capacity single cabinet control systems is directly connected in parallel to output, and a Hall current sensor is mounted on the output side of the direct current bus and connected with a general regulation PLC.
The single 80kA power capacity single cabinet control system comprises a unit rectifier transformer, a cabinet A, a cabinet B unit output bus and a single unit output current sensor, wherein the cabinet A comprises a cabinet A control system, a cabinet A rectifier system and a cabinet A output current Hall sensor; the B cabinet comprises a B cabinet control system, a B cabinet rectification system and a B cabinet output current Hall sensor;
the primary coil of the rectifier transformer of the unit adopts a zigzag connection mode, four groups of windings are shared by the secondary side, the four groups of windings are respectively output in a positive and negative star connection mode and a positive and negative triangle connection mode, the positive and negative star output windings enter respective rectifier bridges after being respectively connected with the saturable reactor, and finally are connected in parallel to form in-phase and inverse parallel output;
and the master PLC receives the total output current setting of the upper computer and compares the total output Hall current value measured by the total output direct current bus, if the output error is more than eight per thousand, the sub-regulation value is calculated, after the calculated sub-regulation result is compared with the sampling value of the single unit output Hall current sensor, the single unit output error is more than one per thousand, and the sub-regulation value is sent to the corresponding unit. And real-time monitoring and comparison are carried out, and field control is realized.
The connection mode of the No. 1-8 unit of the single cabinet control system and the electrolytic cell is shown in figure 2, namely, one end of each cabinet is mounted on a 220kV alternating current bus, and the other end of each cabinet is directly connected in parallel for output. And a Hall current sensor is arranged on the output side of the direct current bus and is connected with a master control PLC.
The A cabinet rectifying system is connected with the positive and negative star-shaped winding, and the B cabinet rectifying system is connected with the positive and negative triangular winding; the output equivalent pulse wave number of the cabinet A is 12 pulse waves, the output of the cabinet B is also 12 pulse waves, the output of the cabinet A and the output of the cabinet B are connected in parallel and then are output by a single unit, the output equivalent pulse wave number of the unit is 24 pulse waves, the circular edge of each unit adopts a zigzag winding to change the output phase of the unit, and the output equivalent pulse wave number of 7 units of the system is 168 pulse waves.
A communication system: the system consists of an upper computer local area network and a field bus and bears the communication tasks among all modules. The upper computer local area network uses an industrial Ethernet switch as a central node, and takes profibus as a bus protocol on site.
The rectification systems of the A cabinet and the B cabinet adopt the same structure and are composed of six groups of connected saturable reactors and a three-phase full-bridge rectification circuit, and offset windings of the six groups of saturable reactors are connected in series and then used as loads to be supplied with power by a control system circuit.
A unit redundancy operation control method of synchronous echelon replacement includes the steps of firstly detecting output current, detecting output voltage of DCDC after PLC when current output accuracy is larger than one thousandth, quickly regulating and controlling the output voltage of PLC through a segmented PI switching control algorithm, controlling current value passing through a saturable reactor offset winding by controlling output voltage of a DC-DC circuit, and further controlling output current of a rectifier unit.
When the output voltage of the DC-DC converter of the single cabinet control system is 0-VconirolThe output voltage is divided into N sections, and in the voltage section VM-1～VMAn internal fixed parameter PI regulator with a regulator parameter [ PM IM]The N-segment voltage has N groups of parameters, and is expressed as: [ P ]1 I1]、[P2 I2]...[PM IM]...[PN IN](ii) a The single-cabinet controller realizes the output fast switching control by acquiring the output voltage of the DC-DC converter of the control system.
Preferably, fixed parameters in voltage segments are adopted, PI values in different intervals are rapidly switched, the system is rapidly started, the starting safety and stability are higher, the current regulation and control under variable load also has higher response speed, and efficient current regulation is realized. Meanwhile, the adaptability of the system under variable parameters and the portability of the system are improved.
The control principle of the single cabinet is shown in fig. 7, firstly, output current detection is carried out, if the current output precision is greater than one thousandth, the output voltage of the DCDC behind the PLC is detected, the output voltage of the PLC is rapidly regulated and controlled by the single cabinet switching control principle according to the segmented PI switching control algorithm shown in fig. 8, then the current value passing through the offset winding of the saturable reactor is controlled by controlling the output voltage of the DC-DC circuit, and the purpose of controlling the output current of the rectifier unit is further achieved.
If the number of the fault cabinets is larger than one, if the fault cabinets have fixed adjustment errors, the fault cabinets are maintained to operate, the fault cabinets are distributed to the other six cabinets through the total adjustment value to maintain the precision of the total output current, if the fault cabinets cannot be maintained to operate, derating operation is carried out, and meanwhile, the upper computer is inquired to judge whether the total output needs to be shut down.
And after 3-5 instruction cycles of the total debugging PLC, if a certain cabinet still cannot achieve the current value output below a thousandth error, determining that the cabinet is in an abnormal working state, determining the fault of the cabinet, sending a fault code and performing a fault bit supplementing process.
Firstly, cold starting a No. 8 cabinet; and then, synchronous control of the fault cabinet and the No. 8 cabinet is carried out, namely, gradual function replacement of output current is carried out, the output current of the fault cabinet is increased by 10% in each function replacement period, and the output current of the position-complementing cabinet is increased by 10% at the same time. Realizing the stable transition of the output current; after the fault cabinet completely quits the current output, the current output of the fault cabinet is closed
The system control schematic diagram is shown in fig. 4, under the working condition, a parallel output mode of 7 units is adopted, the installed total amount of each system is 80kA, 560kA output of the system is realized, the system output precision is eight thousandths, and the single cabinet output precision is one thousandth. The output current value, the output precision and the response speed of the device are all superior to those of the prior art.
The above description is only a preferred embodiment of the 560kA aluminum electrolysis power supply system based on the switching control and the control method thereof, and the protection range of the 560kA aluminum electrolysis power supply system based on the switching control and the control method thereof is not limited to the above embodiments, and all technical solutions belonging to the idea belong to the protection range of the present invention. It should be noted that modifications and variations which do not depart from the gist of the invention will be those skilled in the art to which the invention pertains and which are intended to be within the scope of the invention.
Claims (10)
1. A560 kA aluminum electrolysis power supply system based on switching control is characterized in that: the system comprises an upper computer control system, a field control system, a communication system and a monitoring and backup system;
the field control system comprises a master dispatching system and eight single cabinet control systems with 80kA power capacities, the eight single cabinet control systems with 80kA power capacities are connected in a star-shaped structure through profibus, the field control system adopts a master dispatching PLC, the master dispatching PLC is taken as a central node and is respectively connected with the eight single cabinet systems, and the communication system adopts an Ethernet switch;
the upper computer control system and the general dispatching PLC carry out remote communication and instruction issuing through an LAN interface of the Ethernet switch;
the monitoring and backup system comprises a monitoring backup station 1, a monitoring backup station 2, a GPS receiver and a printer, and local area network connection is carried out through an LAN interface, wherein the monitoring backup stations 1 and 2 receive GPS time service and positioning service and record parameters returned by a field control system, and the monitoring backup stations 1 and 2 are dual-computer hot backup and are remote backup and respectively control the printer to record the parameters.
2. The 560kA aluminum electrolysis power supply system based on switching control as claimed in claim 1, wherein: and when the master control PLC judges that the No. 1-7 single cabinet is in an abnormal working state, the abnormal working single cabinet is disconnected and the No. 8 single cabinet is connected in for fault position compensation.
3. The 560kA aluminum electrolysis power supply system based on switching control as claimed in claim 1, wherein: one end of each of the eight 80kA power capacity single cabinet control systems is mounted on a 220kV alternating current bus, the other end of each of the eight 80kA power capacity single cabinet control systems is directly connected in parallel to output, and a Hall current sensor is mounted on the output side of the direct current bus and connected with a general regulation PLC.
4. The 560kA aluminum electrolysis power supply system based on switching control as claimed in claim 1, wherein: the single 80kA power capacity single cabinet control system comprises a unit rectifier transformer, a cabinet A, a cabinet B unit output bus and a single unit output current sensor, wherein the cabinet A comprises a cabinet A control system, a cabinet A rectifier system and a cabinet A output current Hall sensor; the B cabinet comprises a B cabinet control system, a B cabinet rectification system and a B cabinet output current Hall sensor;
the primary coil of the rectifier transformer of the unit adopts a zigzag connection mode, four groups of windings are shared by the secondary side, the four groups of windings are respectively output in a positive and negative star connection mode and a positive and negative triangle connection mode, the positive and negative star output windings enter respective rectifier bridges after being respectively connected with the saturable reactor, and finally are connected in parallel to form in-phase and inverse parallel output;
the A cabinet rectifying system is connected with the positive and negative star-shaped winding, and the B cabinet rectifying system is connected with the positive and negative triangular winding; the output equivalent pulse wave number of the cabinet A is 12 pulse waves, the output of the cabinet B is also 12 pulse waves, the output of the cabinet A and the output of the cabinet B are connected in parallel and then are output by a single unit, the output equivalent pulse wave number of the unit is 24 pulse waves, the circular edge of each unit adopts a zigzag winding to change the output phase of the unit, and the output equivalent pulse wave number of 7 units of the system is 168 pulse waves.
5. The 560kA aluminum electrolysis power supply system based on switching control as claimed in claim 1, wherein: the rectification systems of the A cabinet and the B cabinet adopt the same structure and are composed of six groups of connected saturable reactors and a three-phase full-bridge rectification circuit, and offset windings of the six groups of saturable reactors are connected in series and then used as loads to be supplied with power by a control system circuit.
6. A unit redundancy operation control method for synchronous echelon replacement, which is based on the 560kA aluminum electrolysis power supply system based on switching control as claimed in claim 1, and is characterized in that: firstly, output current detection is carried out, when the current output precision is greater than one thousandth, the output voltage of the DCDC is detected after the PLC, the output voltage of the PLC is quickly regulated and controlled through a segmented PI switching control algorithm, then the current value passing through the offset winding of the saturable reactor is controlled by controlling the output voltage of the DC-DC circuit, and further the output current of the rectifier unit is controlled.
7. The method for controlling the unit redundant operation of synchronous echelon replacement as claimed in claim 6, wherein: when the output voltage of the DC-DC converter of the single cabinet control system is 0-VconirolThe output voltage is divided into N sections, and in the voltage section VM-1～VMAn internal fixed parameter PI regulator with a regulator parameter [ PM IM]The N-segment voltage has N groups of parameters, and is expressed as: [ P ]1 I1]、[P2I2]...[PM IM]...[PN IN](ii) a The single-cabinet controller realizes the output fast switching control by acquiring the output voltage of the DC-DC converter of the control system.
8. The method for controlling the unit redundant operation of synchronous echelon replacement as claimed in claim 7, wherein: by adopting fixed parameters in voltage segments, PI values in different intervals are rapidly switched, the system is rapidly started, the starting safety and stability are higher, the current regulation and control under variable load also has higher response speed, and efficient current regulation is realized.
9. The method for controlling the unit redundant operation of synchronous echelon replacement as claimed in claim 6, wherein: and after 3-5 instruction cycles of the total debugging PLC, if a certain cabinet still cannot achieve the current value output below a thousandth error, determining that the cabinet is in an abnormal working state, determining the fault of the cabinet, sending a fault code and performing a fault bit supplementing process.
10. The method for controlling the unit redundant operation of synchronous echelon replacement as claimed in claim 9, wherein: firstly, cold starting a No. 8 cabinet; and then, synchronous control of the fault cabinet and the No. 8 cabinet is carried out, namely, gradual function replacement of output current is carried out, the output current of the fault cabinet is increased by 10% in each function replacement period, and the output current of the position-complementing cabinet is increased by 10% at the same time.
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| CN113268041A (en) * | 2021-04-30 | 2021-08-17 | 万华化学(宁波)氯碱有限公司 | Rectification system starting control method and system based on DCS (distributed control system) |
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