CN208433917U - Voltage-sharing control device and extra-high voltage flexible direct current transmission system - Google Patents
Voltage-sharing control device and extra-high voltage flexible direct current transmission system Download PDFInfo
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Abstract
The utility model discloses a voltage-sharing control device, which comprises a module information acquisition unit, a layered processor, a trigger selection processor, a system information acquisition unit and a merging unit; the module information acquisition unit is connected with the layered processor, and the layered processor is connected with the trigger selection processor; the system information acquisition unit is connected with the merging unit, and the merging unit is connected with the trigger selection processor; the module information acquisition unit is used for acquiring the voltage of the submodule of the modular multilevel converter, the layering processor performs layering on the submodule according to the voltage of the submodule, and the trigger selection processor generates a trigger signal according to the information acquired by the system information acquisition unit, so that the submodule in the modular multilevel converter is controlled. The utility model also discloses an extra-high voltage flexible direct current transmission system. Adopt the embodiment of the utility model provides a, can reduce the time complexity when reducing switching frequency, reduce the switching device loss, prolong the transverter life-span, improve the reliability of system.
Description
Technical Field
The utility model relates to an electric power system technical field especially relates to a voltage-sharing control device and extra-high voltage flexible direct current transmission system.
Background
In recent years, Modular Multilevel Converters (MMC) have become the first choice Converter topology of a flexible direct current transmission system due to their unique advantages in the aspects of independent control of active power and reactive power, new energy access, asynchronous networking, urban power supply and the like, and have been widely applied in the world, and the MMC has been rapidly developed from the initial low-voltage and small-capacity demonstration project to the direction of a high-voltage, large-capacity and multi-terminal system, and has shown a good development prospect.
In the operation process of the modular multilevel converter, voltage balance is a key technology for controlling the operation of the converter, along with the rapid development of MMC engineering towards the direction of high voltage level and large capacity, the MMC voltage-sharing algorithm for calculating complexity in a shorter time and reducing the switching frequency of a power electronic device is researched, and the method has important significance for improving the expandability and the control performance of the MMC and reducing the loss. The voltage equalizing system of the flexible direct-current transmission system is researched more at home and abroad and applied to engineering more mature, the existing voltage equalizing system is optimized on the basis of the traditional voltage equalizing system, but the processor configuration resource is higher, and the switching frequency of the hardware configuration and equipment of the processor cannot be reduced at the same time, so that the loss of a switching device is caused, and the service life of the modular multilevel converter is shortened.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a voltage-sharing control device and special high voltage flexible direct current transmission system can reduce the time complexity when reducing switching frequency, reduces switching device's loss to reduce the loss of many level of modularization transverter, prolong the life-span of many level of modularization transverter, improved the reliability of system.
In order to achieve the above object, an embodiment of the present invention provides a voltage-sharing control device, which includes a module information collecting unit, a layered processor, a trigger selection processor, a system information collecting unit, and a merging unit; wherein,
the module information acquisition unit is connected with the layered processor, and the layered processor is connected with the trigger selection processor; the system information acquisition unit is connected with the merging unit, and the merging unit is connected with the trigger selection processor;
the module information acquisition unit is used for acquiring the voltage of a submodule of the modular multilevel converter, and the layering processor is used for layering the submodule according to the voltage of the submodule, so that the trigger selection processor generates a trigger signal according to the information acquired by the system information acquisition unit, and the submodule of the modular multilevel converter is controlled.
As an improvement of the above scheme, the voltage-sharing control device further includes a control unit and a modulation unit, the control unit is respectively connected to the merging unit and the modulation unit, and the modulation unit is further connected to the trigger selection processor.
As an improvement of the above scheme, the module information acquisition unit includes a number of voltage sensors, and the number of the voltage sensors is equal to the number of the sub-modules in the modular multilevel converter.
As an improvement of the scheme, the system information acquisition unit comprises a voltage measuring device and a current measuring device.
Compared with the prior art, the utility model discloses a voltage-sharing control device passes through module information acquisition unit is used for gathering the voltage of modularization multilevel converter neutron module, the layering treater basis the voltage of submodule piece carries out the layering to the submodule piece, so that trigger selection treater basis system information acquisition unit gathers information, the modulating signal of modulating unit and the layering result of layering treater generate trigger signal to control the submodule piece among the modularization multilevel converter. The problem of voltage-sharing system among the prior art can't reach the switching frequency who reduces processor hardware configuration and equipment simultaneously to cause the loss of switching device and reduce the life-span of modularization multilevel converter is solved, can reduce time complexity when reducing the switching frequency, reduce the loss of switching device, thereby reduce the loss of modularization multilevel converter, the life-span of extension modularization multilevel converter has improved the reliability of system.
In order to achieve the above object, an embodiment of the present invention further provides an extra-high voltage flexible dc transmission system, which includes an ac system, a transformer, a modular multilevel converter, a dc system, and the voltage-sharing control device in any of the above embodiments; wherein,
the voltage-sharing control device is respectively connected with the alternating current system, the modular multilevel converter and the direct current system; the transformer is respectively connected with the alternating current system and the modular multilevel converter; and the direct current system is respectively connected with the modular multilevel converter and the voltage-sharing control device.
As an improvement of the above scheme, the voltage-sharing control device is connected with the modular multilevel converter through an optical fiber.
Compared with the prior art, the utility model discloses an extra-high voltage flexible direct current transmission system passes through voltage-sharing control device gathers the voltage and the bridge arm current of sub-module in the modularization multilevel converter, simultaneously voltage-sharing control device still gathers direct current system's voltage electric current with alternating current system's voltage electric current, thereby voltage-sharing control device basis the voltage of submodule piece carries out the layering to the submodule piece, and then voltage-sharing control device basis the information of system information acquisition unit collection, the modulating signal of modulating unit and the layering result of layering treater generate trigger signal, control the submodule piece in the modularization multilevel converter according to trigger signal at last. The problem of voltage-sharing system among the prior art can't reach the switching frequency who reduces processor hardware configuration and equipment simultaneously to cause the loss of switching device and reduce the life-span of modularization multilevel converter is solved, can reduce time complexity when reducing the switching frequency, reduce the loss of switching device, thereby reduce the loss of modularization multilevel converter, the life-span of extension modularization multilevel converter has improved the reliability of system.
Drawings
Fig. 1 is a schematic structural diagram of a voltage-sharing control device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a submodule in the modular multilevel converter provided in the embodiment of the present invention;
fig. 3 is a schematic layered diagram of a layered processor in a voltage-sharing control device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an extra-high voltage flexible dc power transmission system provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
Referring to fig. 1, fig. 1 is a schematic structural diagram of a voltage-sharing control device provided in an embodiment of the present invention; the voltage-sharing control device is suitable for a modular multilevel converter and comprises a module information acquisition unit 1, a layered processor 2, a trigger selection processor 3, a system information acquisition unit 4 and a merging unit 5; wherein,
the module information acquisition unit 1 is connected with the hierarchical processor 2, and the hierarchical processor 2 is connected with the trigger selection processor 3; the system information acquisition unit 4 is connected with the merging unit 5, and the merging unit 5 is connected with the trigger selection processor 3;
the module information acquisition unit 1 is used for acquiring the voltage of a submodule of the modular multilevel converter, and the layering processor 2 is used for layering the submodule according to the voltage of the submodule, so that the trigger selection processor 3 generates a trigger signal according to the information acquired by the system information acquisition unit 4, and the submodule in the modular multilevel converter is controlled.
Preferably, the voltage-sharing control device further includes a control unit 6 and a modulation unit 7, the control unit 6 is respectively connected to the merging unit 5 and the modulation unit 7, and the modulation unit 7 is further connected to the trigger selection processor 3.
Specifically, the module information acquisition unit 1 includes a plurality of voltage sensors, and the number of the voltage sensors is equal to the number of the sub-modules in the modular multilevel converter. The module information acquisition unit 1 acquires voltages of all sub-modules and sends the voltages of the sub-modules to the hierarchical processor 2.
Specifically, the module information acquisition unit 1 acquires a voltage value of each sub-module on a bridge arm in the modular multilevel converter and extracts a maximum voltage value and a minimum voltage value of the sub-modules on the bridge arm. The voltage values of the submodules on the bridge arm are voltage values in the same control period, and the layering processor 2 performs layering on the submodules, and specifically comprises the following steps:
referring to fig. 2, fig. 2 is a schematic structural diagram of a submodule in the modular multilevel converter provided in the embodiment of the present invention; SM shown in the figure1～SMNRepresenting the sub-modules, sequentially marking the sub-modules on the bridge arm as a 1 st sub-module, a 2 nd sub-module, a 3 rd sub-module, a (N) th sub-module, and L in the figurermIndicating bridge arm reactor, RrmRepresenting the resistance. It should be noted that, in this embodiment, the order marking of the sub-modules on the bridge arm is to identify different sub-modules, and besides the number marking, the number marking may also be performed by using letters or other symbols to mark the sub-modules on the bridge arm. Each submodule is computationally layered according to the following formula:
wherein M is the number of layers and is respectively marked as the 0 th group, the 1 st group, the sum, the M-1 st group, M is more than or equal to 2 and is less than or equal to N, N is the total number of the sub-modules on the bridge arm, U ismaxFor maximum voltage value, U, of sub-module on bridge armminIs the minimum voltage value, U, of the submodule on the bridge armiFor the voltage value of the i-th submodule on the bridge arm, floor denotes rounding down, FiIt indicates the group into which the ith sub-module is divided.
In this embodiment, the layering processor 2 performs layering on the sub-modules according to the calculation result Fi, if F1 is equal to 0, the 1 st sub-module is classified into the 0 th group, if F2 is equal to 1, the 2 nd sub-module is classified into the 1 st group, and if FN-And 5, the N-5 sub-modules are divided into an M-1 group. When the submodules on the bridge arm are divided into two groups, the layering number M is 2 and is marked as a 0 th group and a 1 st group, and the groups where the submodules on the bridge arm are located are expressed by a formulaIs determined if FiIf the value of (b) is 0, the ith sub-module is divided into the 0 th group, if FiIf the value of (1) is greater, the ith sub-module is grouped into the 1 st group.
In this embodiment, the number M of the layers may be any integer between 2 and N, and M may be adjusted as needed, where the fewer the number of layers, the lower the time complexity, and the lowest the time complexity when two layers are separated.
Referring to fig. 3, fig. 3 is a schematic diagram of a hierarchical processor 2 in a voltage-sharing control device according to an embodiment of the present invention. Wherein, C1，C2，C3，C4，C5，C6，C7，C8，C9，、、、，CN-5、CN-4、CN-3、CN-2、CN-1、CNAre numbered submodules. The first row array is the result of sequencing according to the sequence number of the sub-modules from small to large, and the second row array is according to the formulaAnd calculating the obtained layering result. In this embodiment, the sub-modules grouped into each group are sorted in the order of increasing labels. Preferably, the layered processor 2 may be an upgraded version of a single chip processor (DSP), and the model is an FPGA, a latest version of a V7FPGA board card of Altera corporation or Xilinx corporation.
Specifically, the system information collecting unit 4 includes a voltage measuring device and a current measuring device, the voltage measuring device is used for collecting the voltage of the ac system and the voltage of the dc system, and the current measuring device is used for collecting the current of the ac system, the current of the dc system, and the bridge arm current of the modular multilevel converter.
Specifically, the merging unit 5 merges the voltage of the ac system, the voltage system of the dc system, the current of the ac system, the current of the dc system, and the bridge arm current acquired by the system information acquisition unit 4 by using a unified communication protocol, and sends the merged voltages, the current of the dc system, and the bridge arm current to the control unit 6. And meanwhile, the merging unit 5 sends the bridge arm current to the trigger selection processor 3.
Specifically, the trigger selection processor 3 generates a trigger signal according to the layering result sent by the layering processor 2 and the bridge arm current sent by the merging unit 5 according to the sub-module serial number, where the trigger signal is used to trigger the sub-module. Preferably, the triggering selection processor 3 may be connected to a driving circuit in the modular multilevel converter, and the driving circuit is connected to the sub-module, so as to trigger the sub-module through the driving circuit.
Specifically, the control unit 6 is a digital controller, and is composed of a plurality of board cards and a processor. The control unit 6 processes the acquired digital signals (i.e., the signals acquired by the system information acquisition unit 4 and received by the merging unit 5), and inputs the processed digital signals into the board card and the processor of the controller. Preferably, the control unit 6 writes the digital signal into the processor by using an algorithm such as DQ conversion algorithm and PI control in the automatic control principle, and outputs an ac voltage reference wave (digital signal).
Specifically, the modulation unit 7 performs algorithm processing on the ac voltage reference wave (digital signal) to generate a modulation signal (digital signal), and the modulation unit 7 is a modulation signal generator. The modulation unit 7 calculates the number of the turned-on sub-modules according to the ac voltage reference wave, and sends the number of the turned-on sub-modules (i.e., modulation signals) to the trigger selection processor 3.
It should be noted that, in the embodiment of the present invention, the voltage equalizing device includes two processors, respectively, the layered processor 2 and the trigger selection processor 3, and the two processors may be processors with the same model or processors with different models, but the functions implemented by the two processors are different. The layering processor 2 is configured to layer the sub-modules, and send a layering result to the trigger selection processor 3; the trigger selection processor 3 receives the layering result sent by the layering processor 2, the bridge arm current signal sent by the merging unit 5 and the number of the sub-modules to be turned on sent by the modulation unit 7, so that the trigger selection processor 3 generates a trigger signal to select to turn on the sub-modules.
Preferably, when the direction of the bridge arm current is positive, the trigger selection processor 3 triggers the submodules one by one from the 0 th group according to the serial numbers of the submodules from small to large, if the number of the submodules to be activated is greater than the number of the submodules in the 0 th group, the submodules in the 1 st group are continuously selected to be activated according to the serial numbers of the submodules from small to large, if the number of the submodules to be activated is greater than the total number of the submodules in the 0 th group and the 1 st group, the sequential selection is continuously performed backwards, and when the number of the activated submodules reaches the number of the submodules to be activated, the selection of a.
When the direction of the bridge arm current is negative, the trigger selection processor 3 triggers the submodules one by one from the M-1 th group from large to small according to the serial numbers of the submodules, if the number of the submodules needing to be opened is larger than the number of the submodules in the M-1 th group, the submodules in the M-2 th group continue to be selected and triggered from large to small according to the serial numbers of the submodules, if the number of the submodules needing to be opened is larger than the total number of the submodules in the M-1 th group and the M-2 th group, the triggering continues to be selected in sequence, and when the number of the submodules needing to be opened reaches the number of the submodules needing to.
Specifically, when the modular multilevel converter receives the trigger signal of the trigger selection processor 3, the driving circuit generates a pulse signal according to the trigger signal, so that the switching of the IGBT is controlled through the pulse signal, the submodule can be selectively switched on or off, and the purpose of voltage sharing of the modular multilevel converter is achieved.
Compared with the prior art, the utility model discloses a voltage-sharing control device passes through module information acquisition unit 1 is used for gathering the voltage of the many level of modularization transverter neutron module, layer processor 2 basis the voltage of submodule piece carries out the layering to the submodule piece, so that trigger selection treater 3 basis information, modulation unit 7's modulation signal and layer processor 2's the layering result generation trigger signal of 4 collection of system information acquisition unit to control the submodule piece among the many level of modularization transverter. The problem of voltage-sharing system among the prior art can't reach the switching frequency who reduces processor hardware configuration and equipment simultaneously to cause the loss of switching device and reduce the life-span of modularization multilevel converter is solved, can reduce time complexity when reducing the switching frequency, reduce the loss of switching device, thereby reduce the loss of modularization multilevel converter, the life-span of extension modularization multilevel converter has improved the reliability of system.
Example two
Referring to fig. 4, fig. 4 is a schematic structural diagram of an extra-high voltage flexible dc transmission system according to an embodiment of the present invention. The voltage-sharing control device comprises an alternating current system 20, a transformer 30, a modular multilevel converter 40, a direct current system 50 and the voltage-sharing control device 10 in any one of the above embodiments; wherein,
the voltage-sharing control device 10 is respectively connected with the alternating current system 20, the modular multilevel converter 40 and the direct current system 50; the transformer 30 is connected to the ac system 20 and the modular multilevel converter 40, respectively; the dc system 50 is respectively connected to the modular multilevel converter 40 and the voltage-sharing control device 10.
Preferably, please refer to the working process of the first embodiment for the detailed working process of the voltage-sharing control device 10, which is not described herein again.
Preferably, the module information collecting unit 1 in the voltage-sharing control device 10 collects the voltage of each sub-module in the modular multilevel converter 40, and then the sub-modules are layered by the layering processor 2 in the voltage-sharing control device 10.
The system information collecting unit 4 in the voltage-sharing control device 10 collects the voltage and the current of the ac system 20, the voltage and the current of the dc system 50, and the bridge arm current of the modular multilevel converter 40, respectively. So that the trigger selection processor 3 in the voltage-sharing control device 10 generates a trigger signal according to the layering result sent by the layering processor 2, the bridge arm current signal sent by the merging unit 5, and the number of the switching-on sub-modules (modulation signals) sent by the modulation unit 7, where the trigger signal is used to trigger the sub-modules in the modular multilevel converter 40. Preferably, the trigger selection processor 3 may be connected to a driving circuit in the modular multilevel converter, and the driving circuit is connected to the sub-module, so that the sub-module is triggered by the driving circuit, the driving circuit generates a pulse signal according to the trigger signal, and the switching of the IGBT is controlled by the pulse signal, so that the sub-module can be switched on or off, and the purpose of voltage balancing of the modular multilevel converter 40 is achieved.
Preferably, the voltage equalizing control device 10 is connected to the modular multilevel converter 40 through an optical fiber. The optical fiber has the characteristics of high sampling frequency, low time delay and high transmission quality.
Compared with the prior art, the utility model discloses an extra-high voltage flexible direct current transmission system passes through voltage-sharing control device 10 gathers the voltage and the bridge arm current of sub-module in modularization multilevel converter 40, simultaneously voltage-sharing control device 10 still gathers direct current system 50's voltage electric current with alternating current system 20's voltage electric current, thereby voltage-sharing control device 10 basis the voltage of submodule piece carries out the layering to the sub-module, and then voltage-sharing control device 10 basis the information of system information acquisition unit 4 collection, the modulating signal of modulating unit and the layering result of layering treater 2 generate trigger signal, control the submodule piece in modularization multilevel converter 40 according to trigger signal at last. The problem of voltage-sharing system among the prior art can't reach the switching frequency who reduces processor hardware configuration and equipment simultaneously to cause the loss of switching device and reduce the life-span of modularization multilevel converter is solved, can reduce time complexity when reducing the switching frequency, reduce the loss of switching device, thereby reduce the loss of modularization multilevel converter, the life-span of extension modularization multilevel converter has improved the reliability of system.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (6)
1. A voltage-sharing control device is characterized by being suitable for a modular multilevel converter and comprising a module information acquisition unit, a layered processor, a trigger selection processor, a system information acquisition unit and a merging unit; wherein,
the module information acquisition unit is connected with the layered processor, and the layered processor is connected with the trigger selection processor; the system information acquisition unit is connected with the merging unit, and the merging unit is connected with the trigger selection processor;
the module information acquisition unit is used for acquiring the voltage of a submodule of the modular multilevel converter, and the layering processor is used for layering the submodule according to the voltage of the submodule, so that the trigger selection processor generates a trigger signal according to the information acquired by the system information acquisition unit, and the submodule of the modular multilevel converter is controlled.
2. The voltage-sharing control device according to claim 1, wherein the voltage-sharing control device further comprises a control unit and a modulation unit, the control unit is respectively connected with the merging unit and the modulation unit, and the modulation unit is further connected with the trigger selection processor.
3. The voltage-sharing control device of claim 1, wherein the module information acquisition unit comprises a number of voltage sensors, and the number of the voltage sensors is equal to the number of the sub-modules in the modular multilevel converter.
4. The voltage-sharing control device according to claim 1, wherein the system information acquisition unit includes a voltage measurement device and a current measurement device.
5. An extra-high voltage flexible direct current transmission system, which is characterized by comprising an alternating current system, a transformer, a modular multilevel converter, a direct current system and a voltage-sharing control device of any one of the claims 1 to 4; wherein,
the voltage-sharing control device is respectively connected with the alternating current system, the modular multilevel converter and the direct current system; the transformer is respectively connected with the alternating current system and the modular multilevel converter; and the direct current system is respectively connected with the modular multilevel converter and the voltage-sharing control device.
6. The extra-high voltage flexible direct current transmission system according to claim 5, wherein the voltage equalizing control device is connected with the modular multilevel converter through an optical fiber.
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