CN110854873A - Three-level control system and method of SVG device and computer storage medium - Google Patents
Three-level control system and method of SVG device and computer storage medium Download PDFInfo
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
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Abstract
The invention relates to the field of SVG device control, in particular to a three-level control system, a three-level control method and a computer storage medium of an SVG device, wherein the SVG device comprises a power module formed by cascading a plurality of power units, and the three-level control system comprises a central control module, a split-phase control module and an optical fiber board level control module; the central control module, the split-phase control module, the fiber board level control module and the power module are sequentially cascaded; the invention manages the power unit module of the whole device reasonably and efficiently through the three-level control system, has better control effect than the conventional control system, and has the following obvious control advantages: the lower control delay is mainly embodied in a completely parallel working mode between the phase separation controllers and between the optical fiber plates, so that the speed of the control system is greatly improved, and the control delay of the control system is reduced.
Description
Technical Field
The invention relates to the field of SVG device control, in particular to a three-level control system and method of an SVG device and a computer storage medium.
Background
With the increasing demand of new energy sites such as offshore wind power on Static Var Generators (SVG), the SVG with high voltage and large capacity becomes a preferred technology for meeting the site demand. The 10kV direct-hanging SVG meets the requirements of some fields by accessing a booster transformer to a 35kV power grid, but because of the increase of reactive capacity, the booster SVG is difficult to manufacture, the manufacturing cost is increased greatly, and the cost performance is reduced sharply. Therefore, the 35kV direct-hanging SVG is imperative to be introduced. Under the condition of the same current, the capacity of the 35kV direct-hanging SVG is 3.5 times that of the 10kV direct-hanging SVG, and the larger capacity can meet the field of the current large-capacity reactive power demand.
The current SVG device is realized based on power electronic devices and limited by the influence of a power electronic withstand voltage value, and the actual SVG is realized by cascading a plurality of power units. The higher the voltage level, the greater the number of cells cascaded. In general, the 10kV voltage level direct-hanging type SVG device is composed of 30-36 power units, and the 35kV voltage level direct-hanging type SVG device is composed of 108-126 power units. When the SVG device runs, the main control needs to exchange and control data of each power unit, the control task is huge, and the conventional control system architecture is hard to be competent.
Disclosure of Invention
The invention aims to provide a three-level control system and method of an SVG device and a computer storage medium, which can reasonably and efficiently manage the power unit of the whole SVG device.
The technical scheme for solving the technical problems is as follows: a three-level control system of an SVG device comprises a power module formed by cascading a plurality of power units, wherein the three-level control system comprises a central control module, a split-phase control module and a fiber board level control module; the central control module, the split-phase control module, the fiber board level control module and the power module are sequentially cascaded;
the central control module is used for generating a positive sequence reactive instruction, a positive sequence active instruction, a negative sequence reactive instruction and a negative sequence active instruction according to the electrical parameters, generating a primary modulation wave according to the positive sequence reactive instruction, the positive sequence active instruction, the negative sequence reactive instruction, the negative sequence active instruction and the actual output current of the SVG device, and sending the primary modulation wave to the split-phase control module;
the split-phase control module is used for calculating the direct current voltage average value in the corresponding phase of the SVG device according to the primary modulation wave, generating a secondary modulation wave according to the direct current voltage average value in the phase, and issuing the secondary modulation wave to the optical fiber board level control module;
and the optical fiber board level control module is used for carrying out time sequence and logic processing on the secondary modulation wave to generate a tertiary modulation wave, sending the tertiary modulation wave to a corresponding power unit in the power module, and controlling the power unit to modulate.
The invention has the beneficial effects that: the three-level control system of the SVG device adopts a three-level control scheme design; the first level is a central control module, and the top-level algorithm of the whole system is managed, including total direct-current voltage control, interphase direct-current voltage control, a double closed-loop control system of an inner loop and an outer loop and the like; the second level is a split-phase control module which receives a control command sent by the central control module, manages the module of the power unit of the phase and controls the in-phase balance of the direct-current voltage of the power module; the third level is a fiber board level control module, because a single fiber board can only manage 6-10 power units, a plurality of fiber boards are needed to complete the control of the single-phase power units, and each fiber board manages the managed power units. The three-level control system is used for reasonably and efficiently managing the power unit modules of the whole device, has a better control effect than a conventional control system, and has the following obvious control advantages: the lower control delay is mainly embodied in a completely parallel working mode between the phase separation controllers and between the optical fiber plates, so that the speed of the control system is greatly improved, and the control delay of the control system is reduced; lower control cost, because the valve tower that 35kV SVG comprises the power unit arranges according to the whole phase, and is very big moreover, can place the phase separation controller in suitable position like this and can reduce the length of the optic fibre line between phase separation controller and the power unit, compare in the optic fibre of three-phase all to the advantage that same master control position has low-cost more.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, the split-phase control modules are three and respectively comprise an A-phase control module, a B-phase control module and a C-phase control module, and the optical fiber board level control module comprises a plurality of A-phase optical fiber board level control modules, a plurality of B-phase optical fiber board level control modules and a plurality of C-phase optical fiber board level control modules; the central processor is respectively connected with the phase A control module, the phase B control module and the phase C control module; the phase A control module, the phase B control module and the phase C control module are connected with each other; all the A-phase optical fiber board-level control modules are respectively connected with the A-phase control module; all the B-phase optical fiber board-level control modules are respectively connected with the B-phase control module; all the C-phase optical fiber board level control modules are respectively connected with the C-phase control module; each A-phase optical fiber board level control module is connected with the corresponding power unit in the power module, each B-phase optical fiber board level control module is connected with the corresponding power unit in the power module, and each C-phase optical fiber board level control module is connected with the corresponding power unit in the power module.
Further, the central control module is also used for detecting first fault information of the SVG device and sending a primary blocking pulse instruction to the phase separation controller according to the first fault information;
the phase separation controller is also used for issuing a secondary blocking pulse instruction to the optical fiber board level control module according to the primary blocking pulse instruction;
the optical fiber board level control module is further used for issuing a third-level blocking pulse instruction to the power module according to the second-level blocking pulse instruction and controlling the corresponding power unit in the power module to block.
Further, the power unit is configured to upload second failure information to the corresponding optical fiber board level control module after a second failure occurs;
the optical fiber board level control module is further used for uploading the second fault information to the corresponding split-phase control module after receiving the second fault information;
the split-phase control module is further configured to transmit the second fault information to the other two split-phase controllers after receiving the second fault information; after the three split-phase control modules all obtain the second fault information, starting fault processing, and issuing a blocking pulse command to the corresponding optical fiber board level control module;
the optical fiber board level control module is also used for controlling the corresponding power unit in the power module to be blocked according to the blocking pulse command.
Further, the central controller is specifically configured to obtain phase angle information of the grid voltage through a closed-loop phase-locked loop algorithm, decompose the system current of the SVG device according to the phase angle information, obtain a positive sequence reactive current of the load current, and perform amplitude limiting processing on the positive sequence reactive current to obtain the positive sequence reactive instruction;
performing difference processing on the total direct current side voltage of the power module and a preset reference value, and outputting the difference through an outer ring regulator to obtain the positive sequence active instruction;
subtracting the mean value of the total in-phase direct-current voltage and the three-phase direct-current voltage of the SVG device, and outputting the processed result through an interphase outer ring regulator to obtain the negative sequence reactive instruction and the negative sequence active instruction;
and performing difference processing on the positive sequence reactive instruction, the positive sequence active instruction, the negative sequence reactive instruction and the negative sequence active instruction and the current actually output by the SVG device, and then adjusting the current through an inner ring regulator to form the primary modulation wave and output the primary modulation wave to the phase separation controller.
Further, the split-phase control module is specifically configured to,
and calculating the mean value of the in-phase direct current voltage of the SVG device according to the primary modulation wave, outputting the difference between the direct current voltage of each power unit and the mean value of the in-phase direct current voltage through an in-phase balance regulator to obtain the secondary modulation wave, and sending the secondary modulation wave to the optical fiber board level control module.
Furthermore, each power unit is provided with a corresponding sub-control board;
the optical fiber board level control module is specifically configured to perform time sequence and logic processing on the secondary modulation wave to generate a tertiary modulation wave, and send the tertiary modulation wave to the sub-control boards;
and the sub-control board is used for comparing the three-level modulated wave with the triangular wave to form a PWM wave, driving the IGBT after dead zone processing, narrow pulse processing and power amplification, and forming reactive current sent by the SVG device on an AC connection reactor through the PWM voltage conversion action of carrier phase shifting.
Furthermore, the central control module and the phase splitting controller module and the optical fiber board level control module are connected through optical fibers.
The beneficial effect of adopting the further scheme is that: the central control module and the phase splitting controller module and the optical fiber board level control module are in optical fiber communication, and high-reliability control signals are provided for the whole control system.
Based on the three-level control system of the SVG device, the invention also provides a three-level control method of the SVG device.
A three-level control method of an SVG device utilizes the three-level control system to control the SVG device, and comprises the following steps,
the central control module generates a positive sequence reactive instruction, a positive sequence active instruction, a negative sequence reactive instruction and a negative sequence active instruction according to the electrical parameters, generates a primary modulation wave according to the positive sequence reactive instruction, the positive sequence active instruction, the negative sequence reactive instruction, the negative sequence active instruction and the actual output current of the SVG device, and sends the primary modulation wave to the split-phase control module;
the split-phase control module calculates the direct current voltage average value in the corresponding phase of the SVG device according to the primary modulation wave, generates a secondary modulation wave according to the direct current voltage average value in the phase, and sends the secondary modulation wave to the optical fiber board level control module;
and the optical fiber board level control module performs time sequence and logic processing on the secondary modulation wave to generate a tertiary modulation wave, and transmits the tertiary modulation wave to a corresponding power unit in the power module to control the power unit to modulate.
The invention has the beneficial effects that: the three-level control method of the SVG device adopts a three-level control scheme design; the first level is a central control module, and the top-level algorithm of the whole system is managed, including total direct-current voltage control, interphase direct-current voltage control, a double closed-loop control system of an inner loop and an outer loop and the like; the second level is a split-phase control module which receives a control command sent by the central control module, manages the module of the power unit of the phase and controls the in-phase balance of the direct-current voltage of the power module; the third level is a fiber board level control module, because a single fiber board can only manage 6-10 power units, a plurality of fiber boards are needed to complete the control of the single-phase power units, and each fiber board manages the managed power units. The three-level control system is used for reasonably and efficiently managing the power unit modules of the whole device, has a better control effect than a conventional control system, and has the following obvious control advantages: the lower control delay is mainly embodied in a completely parallel working mode between the phase separation controllers and between the optical fiber plates, so that the speed of the control system is greatly improved, and the control delay of the control system is reduced; lower control cost, because the valve tower that 35kV SVG comprises the power unit arranges according to the whole phase, and is very big moreover, can place the phase separation controller in suitable position like this and can reduce the length of the optic fibre line between phase separation controller and the power unit, compare in the optic fibre of three-phase all to the advantage that same master control position has low-cost more.
Based on the three-level control method of the SVG device, the invention also provides a computer storage medium.
A computer storage medium comprising a memory having stored therein at least one computer instruction that when executed by a processor implements the three-level control method of claim 9.
Drawings
FIG. 1 is a schematic structural diagram of a three-level control system of an SVG device according to the present invention;
fig. 2 is a flowchart of a three-level control method of the SVG device of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a three-level control system of an SVG device includes a power module composed of a plurality of power units in cascade; the three-level control system comprises a central control module, a split-phase control module and an optical fiber board level control module; the central control module, the split-phase control module, the fiber board level control module and the power module are sequentially cascaded.
Specifically, the split-phase control modules are three and respectively include an A-phase control module, a B-phase control module and a C-phase control module, and the optical fiber board level control module comprises a plurality of A-phase optical fiber board level control modules, a plurality of B-phase optical fiber board level control modules and a plurality of C-phase optical fiber board level control modules; the central processor is respectively connected with the phase A control module, the phase B control module and the phase C control module; the phase A control module, the phase B control module and the phase C control module are connected with each other; all the A-phase optical fiber board-level control modules are respectively connected with the A-phase control module; all the B-phase optical fiber board-level control modules are respectively connected with the B-phase control module; all the C-phase optical fiber board level control modules are respectively connected with the C-phase control module; each A-phase optical fiber board level control module is connected with the corresponding power unit in the power module, each B-phase optical fiber board level control module is connected with the corresponding power unit in the power module, and each C-phase optical fiber board level control module is connected with the corresponding power unit in the power module.
The three-level control system of the invention is characterized in that when the system works normally:
the central control module is used for generating a positive sequence reactive instruction, a positive sequence active instruction, a negative sequence reactive instruction and a negative sequence active instruction according to the electrical parameters, generating a primary modulation wave according to the positive sequence reactive instruction, the positive sequence active instruction, the negative sequence reactive instruction, the negative sequence active instruction and the actual output current of the SVG device, and sending the primary modulation wave to the three split-phase control modules; the central control module respectively issues the primary modulation wave to the phase A control module, the phase B control module and the phase C control module;
each split-phase control module is used for calculating the direct current voltage average value in the corresponding phase of the SVG device according to the primary modulation wave, generating a secondary modulation wave according to the direct current voltage average value in the phase, and sending the secondary modulation wave to the corresponding optical fiber board level control module; the phase A control module issues the secondary modulation waves to all the phase A optical fiber slab level control modules respectively, the phase B control module issues the secondary modulation waves to all the phase B optical fiber slab level control modules respectively, and the phase C control module issues the secondary modulation waves to all the phase C optical fiber slab level control modules respectively;
each optical fiber board level control module is used for carrying out time sequence and logic processing on the secondary modulation wave to generate a tertiary modulation wave, sending the tertiary modulation wave to a corresponding power unit in the power module and controlling the power unit to modulate; for example, the a-phase fiber board level control module 1 issues the three-level modulated wave to the power units a1-A8, the a-phase fiber board level control module 2 issues the three-level modulated wave to the power units a9-a16, and so on.
Specifically, the central controller is specifically configured to:
obtaining phase angle information of the voltage of a power grid through a closed loop phase-locked loop algorithm, decomposing system current of the SVG device according to the phase angle information (specifically, a double DQ decomposition method is used for decomposition), obtaining positive sequence reactive current of load current, and carrying out amplitude limiting treatment on the positive sequence reactive current to obtain a positive sequence reactive instruction; the amplitude limiting processing is to hook a reactive instruction value of a system with the capacity of the SVG device, the reactive instruction value of the actual system is possibly larger than the design capacity of the SVG device, and if the reactive instruction value is not subjected to amplitude limiting processing and is directly used as a positive sequence reactive instruction of the SVG device, the SVG device can be burnt due to overload;
performing difference processing on the total direct current side voltage of the power module (each power unit has direct current side voltage, and the total direct current side voltage of the power module can be obtained by directly algebraically adding the voltages after sampling) and a preset reference value, and outputting the total direct current side voltage through an outer ring regulator to obtain the positive sequence active power instruction;
performing difference processing on total in-phase direct-current voltage of the SVG device (the total in-phase direct-current voltage of the A phase is the voltage sum of each power unit in the A phase, namely UA (equal to UdcA1+ UdcA2+ … + UdcA 48; the total in-phase direct-current voltage of the B phase is the voltage sum of each power unit in the B phase, namely UB (equal to UdcB1+ UdcB2+ … + UdcB 48; the total in-phase direct-current voltage of the C phase is the voltage sum of each power unit in the C phase, namely UC (equal to UdcC1+ UdcC2+ … + UdcC48) and the average value of three-phase direct-current voltage (the average value of three-phase voltage is (UA + UB + UC)/3), and outputting the obtained negative active sequence reactive power command and the negative active sequence command at intervals;
and performing difference processing on the positive sequence reactive instruction, the positive sequence active instruction, the negative sequence reactive instruction and the negative sequence active instruction and the current actually output by the SVG device, and then adjusting the current through an inner ring regulator to form the primary modulation wave and output the primary modulation wave to the phase separation controller.
Specifically, the split-phase control module is specifically configured to:
and calculating an average value of in-phase direct-current voltages of the SVG device according to the primary modulation wave (taking the phase A as an example, the average value of the in-phase direct-current voltages is (UdcA1+ UdcA2+ + UdcA48)/48), and outputting the difference between the direct-current voltage of each power unit and the average value of the in-phase direct-current voltages through an in-phase balance regulator to obtain the secondary modulation wave, and sending the secondary modulation wave to the fiber board level control module.
In the invention, each power unit is provided with a corresponding sub-control board;
the optical fiber board level control module is specifically configured to perform time sequence and logic processing on the secondary modulation wave to generate a tertiary modulation wave, and send the tertiary modulation wave to the sub-control boards;
and the sub-control board is used for comparing the three-level modulated wave with the triangular wave to form a PWM wave, driving the IGBT after dead zone processing, narrow pulse processing and power amplification, and forming reactive current (namely grid-connected current) sent by the SVG device on an AC connection reactor through the PWM voltage conversion action of carrier phase shifting.
When the three-level control system provided by the invention is in a fault moment, forward fault treatment can be carried out, and the method comprises the following specific steps:
when the SVG device has faults of alternating current overcurrent, alternating current voltage overvoltage, undervoltage, connection reactor overtemperature and the like, the central control module is also used for detecting first fault information of the SVG device and sending a primary blocking pulse instruction to the three phase separation controllers according to the first fault information;
each phase separation controller is also used for issuing a secondary blocking pulse instruction to the corresponding optical fiber board level control module according to the primary blocking pulse instruction;
each optical fiber board level control module is further used for issuing a three-level blocking pulse instruction to a corresponding power unit in the power module according to the two-level blocking pulse instruction and controlling the corresponding power unit to be blocked.
The forward fault processing process can be controlled within 5 us.
When the three-level control system provided by the invention is in a fault moment, reverse fault processing can be carried out, and the method comprises the following specific steps:
the power unit is used for uploading second fault information to the corresponding optical fiber board level control module after a second fault occurs;
the optical fiber board level control module is further used for uploading the second fault information to the corresponding split-phase control module after receiving the second fault information;
the split-phase control module is further configured to transmit the second fault information to the other two split-phase controllers after receiving the second fault information; after the three split-phase control modules all obtain the second fault information, starting fault processing, and issuing a blocking pulse command to the corresponding optical fiber board level control module;
and the optical fiber board level control module is also used for controlling the corresponding power unit in the power module to be blocked according to the blocking pulse command.
For example, when the power unit a1 fails, the power unit a1 uploads second failure information to the a-phase split-phase control module, the a-phase split-phase control module transmits the second failure information to the B-phase split-phase control module and the C-phase split-phase control module, respectively, and after receiving the second failure information, the a-phase split-phase control module starts failure processing and issues blocking pulse commands to all the fiber board level control modules controlled by the a-phase split-phase control module and the C-phase split-phase control module respectively; and the optical fiber board level control module controls the corresponding power unit in the power module to be blocked according to the blocking pulse command. The reverse fault processing process can be controlled within 8 us.
In addition, the central control module and the phase splitting controller module and the optical fiber board level control module are connected through optical fibers. The central control module and the phase splitting controller module and the optical fiber board level control module are in optical fiber communication, and high-reliability control signals are provided for the whole control system.
The three-level control system of the SVG device adopts a three-level control scheme design; the first level is a central control module, and the top-level algorithm of the whole system is managed, including total direct-current voltage control, interphase direct-current voltage control, a double closed-loop control system of an inner loop and an outer loop and the like; the second level is a split-phase control module which receives a control command sent by the central control module, manages the module of the power unit of the phase and controls the in-phase balance of the direct-current voltage of the power module; the third level is a fiber board level control module, because a single fiber board can only manage 6-10 power units, a plurality of fiber boards are needed to complete the control of the single-phase power units, and each fiber board manages the managed power units. The three-level control system is used for reasonably and efficiently managing the power unit modules of the whole device, has a better control effect than a conventional control system, and has the following obvious control advantages: the lower control delay is mainly embodied in a completely parallel working mode between the phase separation controllers and between the optical fiber plates, so that the speed of the control system is greatly improved, and the control delay of the control system is reduced; lower control cost, because the valve tower that 35kV SVG comprises the power unit arranges according to the whole phase, and is very big moreover, can place the phase separation controller in suitable position like this and can reduce the length of the optic fibre line between phase separation controller and the power unit, compare in the optic fibre of three-phase all to the advantage that same master control position has low-cost more.
The three-level control system not only can meet various requirements required by the whole control system, but also has high cost performance and high reliability. Meanwhile, the data exchange trend in normal work is considered, the requirement that the PWM wave needs to be blocked in time at the moment of failure is considered, and the method is an advanced, stable and reliable implementation method through experimental verification, meets the requirement of actual working conditions on equipment, and has profound significance.
Based on the three-level control system of the SVG device, the invention also provides a three-level control method of the SVG device.
As shown in fig. 2, a three-level control method of an SVG device, which uses the above-mentioned three-level control system for control, comprises the following steps,
the central control module generates a positive sequence reactive instruction, a positive sequence active instruction, a negative sequence reactive instruction and a negative sequence active instruction according to the electrical parameters, generates a primary modulation wave according to the positive sequence reactive instruction, the positive sequence active instruction, the negative sequence reactive instruction, the negative sequence active instruction and the actual output current of the SVG device, and sends the primary modulation wave to the split-phase control module;
the split-phase control module calculates the direct current voltage average value in the corresponding phase of the SVG device according to the primary modulation wave, generates a secondary modulation wave according to the direct current voltage average value in the phase, and sends the secondary modulation wave to the optical fiber board level control module;
and the optical fiber board level control module performs time sequence and logic processing on the secondary modulation wave to generate a tertiary modulation wave, and transmits the tertiary modulation wave to a corresponding power unit in the power module to control the power unit to modulate.
The three-level control method of the SVG device adopts a three-level control scheme design; the first level is a central control module, and the top-level algorithm of the whole system is managed, including total direct-current voltage control, interphase direct-current voltage control, a double closed-loop control system of an inner loop and an outer loop and the like; the second level is a split-phase control module which receives a control command sent by the central control module, manages the module of the power unit of the phase and controls the in-phase balance of the direct-current voltage of the power module; the third level is a fiber board level control module, because a single fiber board can only manage 6-10 power units, a plurality of fiber boards are needed to complete the control of the single-phase power units, and each fiber board manages the managed power units. The three-level control system is used for reasonably and efficiently managing the power unit modules of the whole device, has a better control effect than a conventional control system, and has the following obvious control advantages: the lower control delay is mainly embodied in a completely parallel working mode between the phase separation controllers and between the optical fiber plates, so that the speed of the control system is greatly improved, and the control delay of the control system is reduced; lower control cost, because the valve tower that 35kV SVG comprises the power unit arranges according to the whole phase, and is very big moreover, can place the phase separation controller in suitable position like this and can reduce the length of the optic fibre line between phase separation controller and the power unit, compare in the optic fibre of three-phase all to the advantage that same master control position has low-cost more.
Based on the three-level control method of the SVG device, the invention also provides a computer storage medium.
A computer storage medium comprising a memory having stored therein at least one computer instruction that when executed by a processor implements the three-level control method of claim 9.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a tertiary control system of SVG device, the SVG device includes the power module that constitutes by a plurality of power unit cascade, its characterized in that: the three-level control system comprises a central control module, a split-phase control module and an optical fiber board level control module; the central control module, the split-phase control module, the fiber board level control module and the power module are sequentially cascaded;
the central control module is used for generating a positive sequence reactive instruction, a positive sequence active instruction, a negative sequence reactive instruction and a negative sequence active instruction according to the electrical parameters, generating a primary modulation wave according to the positive sequence reactive instruction, the positive sequence active instruction, the negative sequence reactive instruction, the negative sequence active instruction and the actual output current of the SVG device, and sending the primary modulation wave to the split-phase control module;
the split-phase control module is used for calculating the direct current voltage average value in the corresponding phase of the SVG device according to the primary modulation wave, generating a secondary modulation wave according to the direct current voltage average value in the phase, and issuing the secondary modulation wave to the optical fiber board level control module;
and the optical fiber board level control module is used for carrying out time sequence and logic processing on the secondary modulation wave to generate a tertiary modulation wave, sending the tertiary modulation wave to a corresponding power unit in the power module, and controlling the power unit to modulate.
2. The tertiary control system for an SVG device according to claim 1, wherein: the three split-phase control modules are respectively an A-phase control module, a B-phase control module and a C-phase control module, and the optical fiber board level control module comprises a plurality of A-phase optical fiber board level control modules, a plurality of B-phase optical fiber board level control modules and a plurality of C-phase optical fiber board level control modules; the central processor is respectively connected with the phase A control module, the phase B control module and the phase C control module; the phase A control module, the phase B control module and the phase C control module are connected with each other; all the A-phase optical fiber board-level control modules are respectively connected with the A-phase control module; all the B-phase optical fiber board-level control modules are respectively connected with the B-phase control module; all the C-phase optical fiber board level control modules are respectively connected with the C-phase control module; each A-phase optical fiber board level control module is connected with the corresponding power unit in the power module, each B-phase optical fiber board level control module is connected with the corresponding power unit in the power module, and each C-phase optical fiber board level control module is connected with the corresponding power unit in the power module.
3. The tertiary control system for an SVG device according to claim 1, wherein:
the central control module is also used for detecting first fault information of the SVG device and issuing a primary blocking pulse instruction to the phase separation controller according to the first fault information;
the phase separation controller is also used for issuing a secondary blocking pulse instruction to the optical fiber board level control module according to the primary blocking pulse instruction;
the optical fiber board level control module is further used for issuing a third-level blocking pulse instruction to the power module according to the second-level blocking pulse instruction and controlling the corresponding power unit in the power module to block.
4. The tertiary control system for an SVG device according to claim 2, wherein:
the power unit is used for uploading second fault information to the corresponding optical fiber board level control module after a second fault occurs;
the optical fiber board level control module is further used for uploading the second fault information to the corresponding split-phase control module after receiving the second fault information;
the split-phase control module is further configured to transmit the second fault information to the other two split-phase controllers after receiving the second fault information; after the three split-phase control modules all obtain the second fault information, starting fault processing, and issuing a blocking pulse command to the corresponding optical fiber board level control module;
and the optical fiber board level control module is also used for controlling the corresponding power unit in the power module to be blocked according to the blocking pulse command.
5. The three-stage control system of the SVG device according to any one of claims 1 to 4, characterized in that: the central controller is, in particular, configured to,
acquiring phase angle information of the voltage of a power grid through a closed loop phase-locked loop algorithm, decomposing system current of the SVG device according to the phase angle information to obtain positive sequence reactive current of load current, and carrying out amplitude limiting processing on the positive sequence reactive current to obtain a positive sequence reactive instruction;
performing difference processing on the total direct current side voltage of the power module and a preset reference value, and outputting the difference through an outer ring regulator to obtain the positive sequence active instruction;
subtracting the mean value of the total in-phase direct-current voltage and the three-phase direct-current voltage of the SVG device, and outputting the processed result through an interphase outer ring regulator to obtain the negative sequence reactive instruction and the negative sequence active instruction;
and performing difference processing on the positive sequence reactive instruction, the positive sequence active instruction, the negative sequence reactive instruction and the negative sequence active instruction and the current actually output by the SVG device, and then adjusting the current through an inner ring regulator to form the primary modulation wave and output the primary modulation wave to the phase separation controller.
6. The three-stage control system of the SVG device according to any one of claims 1 to 4, characterized in that: the split-phase control module is specifically configured to,
and calculating the mean value of the in-phase direct current voltage of the SVG device according to the primary modulation wave, outputting the difference between the direct current voltage of each power unit and the mean value of the in-phase direct current voltage through an in-phase balance regulator to obtain the secondary modulation wave, and sending the secondary modulation wave to the optical fiber board level control module.
7. The three-stage control system of the SVG device according to any one of claims 1 to 4, characterized in that: each power unit is provided with a corresponding sub-control board;
the optical fiber board level control module is specifically configured to perform time sequence and logic processing on the secondary modulation wave to generate a tertiary modulation wave, and send the tertiary modulation wave to the sub-control boards;
and the sub-control board is used for comparing the three-level modulated wave with the triangular wave to form a PWM wave, driving the IGBT after dead zone processing, narrow pulse processing and power amplification, and forming reactive current sent by the SVG device on an AC connection reactor through the PWM voltage conversion action of carrier phase shifting.
8. The three-stage control system of the SVG device according to any one of claims 1 to 4, characterized in that: the central control module and the phase splitting controller module and the optical fiber board level control module are connected through optical fibers.
9. A three-level control method of an SVG device is characterized in that: control by means of a three-stage control system as claimed in any one of the preceding claims 1 to 8, comprising the steps of,
the central control module generates a positive sequence reactive instruction, a positive sequence active instruction, a negative sequence reactive instruction and a negative sequence active instruction according to the electrical parameters, generates a primary modulation wave according to the positive sequence reactive instruction, the positive sequence active instruction, the negative sequence reactive instruction, the negative sequence active instruction and the actual output current of the SVG device, and sends the primary modulation wave to the split-phase control module;
the split-phase control module calculates the direct current voltage average value in the corresponding phase of the SVG device according to the primary modulation wave, generates a secondary modulation wave according to the direct current voltage average value in the phase, and sends the secondary modulation wave to the optical fiber board level control module;
and the optical fiber board level control module performs time sequence and logic processing on the secondary modulation wave to generate a tertiary modulation wave, and transmits the tertiary modulation wave to a corresponding power unit in the power module to control the power unit to modulate.
10. A computer storage medium, characterized in that: comprising a memory having stored therein at least one computer instruction which, when executed by a processor, implements the three-level control method of claim 9.
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