CN109167364B - Three-port flexible multi-state switching device based on bridge arm multiplexing and hybrid cascading - Google Patents
Three-port flexible multi-state switching device based on bridge arm multiplexing and hybrid cascading 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
Abstract
The invention discloses a three-port flexible multi-state switching device based on bridge arm multiplexing and hybrid cascading, which consists of a single-port MMC of a hybrid cascading structure and a dual-port MMC based on bridge arm multiplexing, wherein the single-port MMC and the dual-port MMC are connected through a common direct-current bus; the hybrid cascade structure single-port MMC is composed of a traditional six-bridge arm MMC and a cascade H bridge, and the bridge arm multiplexing dual-port MMC is a nine-bridge arm MMC structure sharing a middle bridge arm. Under the same alternating-current side voltage level, the number of sub-modules and the number of bridge arm reactors used by the topology are greatly reduced compared with the traditional MMC, and the topology has the capacity of self-clearing of direct-current side short-circuit faults and higher direct-current voltage utilization rate. The invention is suitable for interconnection of distribution lines with different voltage grades and different phase angles, is beneficial to flexibly controlling the flow of active power and reactive power of the system, improves the stability of a power supply and distribution system and improves the quality of electric energy.
Description
Technical Field
The invention belongs to the technical field of flexible multi-state switches, and particularly relates to a three-port flexible multi-state switch device based on bridge arm multiplexing and hybrid cascading.
Background
The distribution network is located at the end of the power system, directly faces to power users, and undertakes the tasks of distributing electric energy and serving the customers. At present, the continuous increase of nonlinear and impact load proportion in a power distribution network and the continuous improvement of new energy permeability provide higher requirements for the power quality and the power supply reliability of the power distribution network. The existing power distribution network is facing to great challenges in various aspects such as customization and diversification of power consumption requirements, large-scale access of distributed power supplies, complicated trend coordination control and the like, and the problems are difficult to be solved effectively by adopting conventional regulation and control means such as a conventional switch and the like.
The flexible multi-state switch is a novel controllable power electronic device, can be connected with distribution lines with different voltage levels, has the functions of power continuous control, harmonic blocking, unbalanced power regulation and the like, has strong real-time regulation performance, can frequently act, is flexible in control mode, and can promote the balance of feeder load distribution and the improvement of electric energy quality.
Until now, some efforts have been made to develop flexible multi-state switches, and Intelligntnode, which is proposed by Egyin thermal university, the Netherlands, and Softnormally Open Point (SNOP), which is proposed by Imperial's institute of technology, the UK, are considered rudiments of flexible multi-state switches.
The Chinese patent with the publication number of CN108173269A provides a flexible multi-state switch and a power grid system, which realize the continuous controllability of the power of a power distribution network and the flexible control of the operation of the power distribution network and meet the power requirements of distributed power supply absorption, high power supply reliability and the like. However, the flexible multi-state switch provided in the patent only analyzes the energy flow process in the operation process, and does not relate to the design and performance exploration of a specific power electronic switch topology.
Chinese patent publication No. CN107346887A proposes a medium-voltage three-port flexible multi-state switch topology based on a power electronic transformer, which can perform connection/disconnection control on multiple medium-voltage distribution lines to achieve rapid reconfiguration of a distribution network, and can perform power regulation on multiple medium-voltage distribution lines to achieve load flow distribution optimization in the distribution network; however, the flexible multi-state switching device provided by the patent uses a large number of high-frequency transformers, so that the size and the weight of the device are increased, the design difficulty of the device is high, and the manufacturing cost is high.
The flexible multi-state switch device is often required to be connected with a plurality of distribution lines with different voltage grades, and the connection groups of transformers connected in the actual operation of each distribution network are different, so that the voltage of a feeder line at each end may have a certain phase angle difference. In order to achieve the best voltage utilization rate, the requirements of distribution lines with different voltage grades on the voltage of a direct current bus are different, and the size of the voltage of the direct current bus determines the specification and the number of power switching devices used by the device, so that the efficiency and the cost of the device are influenced. Therefore, the voltage of the direct current bus should meet and match the requirement of each connected power distribution network on the voltage grade of the direct current bus, and meanwhile, in order to meet the requirement of voltage phase angle difference of different feeder lines, the voltage phase angle of each output port of the flexible multi-state switching device should be independently controllable. The back-to-back structure converter has the advantages of controllable direct-current voltage, bidirectional power flow, flexible and changeable control performance and the like, and can realize asynchronous interconnection among power grids, so that the back-to-back structure converter is widely applied to the field of high-voltage direct-current transmission.
Modular Multilevel Converters (MMC) have gained wide attention and research due to their characteristics such as modularity, easy expansion, good output harmonic performance, etc. In order to further optimize the output performance, improve the system efficiency, reduce the manufacturing cost of the switch device and improve the reliability of the system, the traditional modular multilevel technology is deeply researched and developed in the aspects of active and reactive power control, interphase imbalance management, submodule multiplexing, direct current fault isolation and the like. In the boat and mountain five-terminal flexible direct current transmission science and technology demonstration project, the topology of the multi-terminal flexible direct current transmission converter and the related control technology are also successfully applied. Therefore, the commutation scheme of the novel modular multilevel converter based on the back-to-back structure becomes the preferred reference scheme of the flexible multi-state switching device.
Disclosure of Invention
In view of the above, the three-port flexible multi-state switching device based on bridge arm multiplexing and hybrid cascading is constructed by transforming and integrating the traditional modular multi-level converter on the basis of the topology, so that the functional requirements of a power distribution network on the flexible multi-state switching device are met, the flexible multi-state switching device can be connected with a plurality of power distribution networks with different voltage levels, the reconstruction of the power distribution network is conveniently realized, the flow of active power and reactive power in the power distribution network is controlled, and the power flow distribution is optimized, so that the power quality and the power supply reliability are improved.
A three-port flexible multi-state switching device based on bridge arm multiplexing and hybrid cascading comprises a single-port MMC based on a hybrid cascading structure and a dual-port MMC based on bridge arm multiplexing, wherein direct current sides of the two MMCs are connected through a common direct current bus.
Furthermore, the single-port MMC based on the hybrid cascade structure is a three-phase six-bridge arm structure, each bridge arm is formed by sequentially cascading a plurality of half-bridge sub-modules and a bridge arm reactor, and three cross current sides are all connected with N in seriesFAnd the H bridge sub-modules are connected to the power distribution network as output ports, and NF is a natural number greater than 0.
Furthermore, the dual-port MMC based on bridge arm multiplexing is of a three-phase nine-bridge-arm structure, each phase is formed by connecting three bridge arms in series, each bridge arm is formed by sequentially cascading a plurality of half-bridge sub-modules and a bridge arm reactor, a middle bridge arm of each phase serves as a multiplexing bridge arm, a connection point of the three-phase multiplexing bridge arm and an upper bridge arm of the three-phase multiplexing bridge arm serves as one group of output ports, a connection point of the three-phase multiplexing bridge arm and a lower bridge arm of the three-phase multiplexing bridge arm serves as the other group.
Furthermore, the half-bridge sub-module is composed of two power switches G1-G2 with reverse conducting capability and a capacitor C1, one end of the power switch G1 is connected with one end of the capacitor C1, the other end of the power switch G1 is connected with one end of the power switch G2 and serves as a connection port a of the half-bridge sub-module, the other end of the capacitor C1 is connected with the other end of the power switch G2 and serves as a connection port B of the half-bridge sub-module, and control terminals of the two power switches G1-G2 are connected with a switching signal provided by an external device.
Furthermore, the H-bridge sub-module is composed of four power switches K1-K4 with reverse conducting capability and a capacitor C2, one end of the power switch G1 is connected with one end of the power switch G2 and one end of the capacitor C2, the other end of the power switch G1 is connected with one end of the power switch G3 and serves as a connection port a of the H-bridge sub-module, the other end of the power switch G2 is connected with one end of the power switch G4 and serves as a connection port B of the H-bridge sub-module, the other end of the capacitor is connected with the other end of the power switch G3 and the other end of the power switch G4, and control terminals of the four power switches G1-G4 are connected with switching signals provided by external devices.
Preferably, the power switch with reverse conducting capability adopts IGBT.
Furthermore, for feeder interconnection application of different voltage grades and different phase angles of the power distribution network, the single-port MMC and the dual-port MMC have close requirements on the voltage grade of the direct current bus, and the direct current bus voltage utilization rate and efficiency are high.
Furthermore, the target application occasion of the three-port flexible multi-state switching device is to connect three power distribution networks with voltage levels of 10kV, 10kV and 20kV respectively, and a phase angle difference of 30 degrees exists between the two power distribution networks with the voltage levels of 10 kV.
Based on the technical scheme, the invention has the following beneficial technical effects:
(1) compared with the traditional six-bridge arm MMC, the double-port MMC based on bridge arm multiplexing reduces the using quantity of 1/4 half-bridge submodules and bridge arm reactors, further reduces the volume and cost of a converter, and simultaneously increases the reliability of a system; two output port voltage phases of the dual-port MMC based on bridge arm multiplexing can be different, and the phase difference is controllable.
(2) The single-port MMC adopting the hybrid cascade structure has the capability of self-clearing of the short-circuit fault on the direct-current side, allows a certain degree of overmodulation, and is beneficial to reducing the voltage of a direct-current bus, reducing the voltage grade requirement of a switching tube and reducing the manufacturing cost of equipment.
(3) The requirements of the high-voltage end (20kV) and the low-voltage end (10kV) of the topology on the voltage level of the direct current bus are close, the utilization rate of the direct current voltage on two sides of the bus is improved, and the problem of mismatching of the direct current bus voltage caused by different voltage levels of a power grid is solved.
(4) The device can be connected with three alternating current output ports with different voltage grades, controls the flow of active power and reactive power between the three ports, and has the capabilities of continuous power control, voltage control and unbalanced power regulation.
Drawings
Fig. 1 is a schematic structural diagram of a three-port flexible multi-state switching device according to the present invention.
Fig. 2(a) is a schematic structural diagram of a half-bridge submodule.
Fig. 2(b) is a schematic structural diagram of an H-bridge submodule.
Fig. 3 is a schematic diagram of a fault clearing state of a hybrid cascade structure single-port MMC.
Detailed Description
In order to more specifically describe the present invention, the following detailed description is provided for the technical solution of the present invention with reference to the accompanying drawings and the specific embodiments.
As shown in fig. 1, the three-port flexible multi-state switching device topology based on bridge arm multiplexing and hybrid cascading of the present invention is composed of a single-port MMC adopting a hybrid cascading structure and a dual-port MMC based on bridge arm multiplexing, and the two parts are connected through a common dc bus. Wherein:
(1) a hybrid cascaded single-port MMC is employed.
The hybrid cascade structure single-port MMC is characterized in that a main power topology is a traditional six-bridge arm MMC, and an alternating current output side is of a cascade H-bridge structure. As shown in the left dashed box of FIG. 1, each leg of a conventional six-leg MMC includes NH1A half-bridge submodule and a bridge arm reactor, total 6NH1Half-bridge submodules and 6 bridge arm reactors. Each phase output side cascade H bridge comprises NFH bridge sub-modules of 3NFAnd the H bridge submodule.
The half-bridge sub-module is composed of two reverse conducting power switches and a capacitor, wherein the two reverse conducting power switches are connected in series and then connected in parallel with the capacitor, as shown in fig. 2 (a); the H-bridge sub-module is composed of four reverse conducting power switches and a capacitor, and the four reverse conducting power switches are connected in series two by two and then connected in parallel with the capacitor, as shown in fig. 2 (b).
The mixed cascade structure single-port MMC has two working states, namely a normal operation state and a fault self-clearing state. The normal operation state, taking phase a as an example, is the same as that of a traditional six-bridge arm MMC, and the voltage of a point a at the midpoint of a bridge arm is:
wherein: u. ofhAnd ulThe output voltages of the upper and lower bridge arms of the phase are respectively.
The output phase voltage at the AC side is as follows:
uA＝ua+ua2
wherein: u. ofa2Is the voltage of the cascaded H-bridge.
Under general conditions, the traditional six-bridge arm MMC outputs voltage uaIs a step wave, and the AC output voltage uAIs a sine wave, so that the output voltage u of each phase of the cascaded H-bridgea2Should be the difference between the output step wave and the output sine wave.
In a fault self-clearing state, namely when a short-circuit fault occurs on the direct current side of the system, the driving signals of all the switching tubes are blocked, and short-circuit current flows through the anti-parallel diodes of the switching tubes and the capacitors of the cascade H-bridge. As shown in fig. 3, for example, A, C phases are assumed to be short-circuited, i.e., a voltage of a phase is higher than a voltage of C phase. Short-circuit current cascades H bridge submodule switch tube T from A phase through A phase2、T3Of an antiparallel diode D2、D3And its capacitance CFA phase upper bridge arm half-bridge submodule switch tube T2Is connected in parallel with the diode D2Short-circuit point, C-phase lower bridge arm switch tube T2Is connected in parallel with the diode D2Class CH-bridge connected switch tube T1、T4Is connected in parallel with the diode D1、D4And its capacitance CFFlow into phase C, wherein 2N is passedFCapacitor C of H bridge submoduleFCan be equivalently voltage of 2NFThe direct-current voltage source of the double capacitor voltage is connected into the short-circuit loop. Therefore, as long as the voltage of the equivalent direct current voltage source is larger than the voltage peak value of the alternating current side line, the short-circuit voltage can be rapidly reduced, and the purpose of self-clearing of the direct current fault is achieved.
The modulation mode of the mixed cascade structure single-port MMC is generally a mixed modulation mode, and the modulation modes of a main circuit part and a cascade H-bridge part are mutually independent; meanwhile, the hybrid cascade single-port MMC can provide certain over-modulation capability for the main circuit due to the fact that the alternating current output side is of a cascade H-bridge structure.
When the modulation ratio m is less than 1, the amplitude U of the phase voltage on the AC output sidem1Comprises the following steps:
wherein: u shapedcIs the dc bus voltage.
When the modulation ratio m is larger than 1, the converter can still normally operate within a certain modulation ratio range, namely the converter has certain overmodulation capability. Amplitude U 'of alternating current output side phase voltage under mixed cascade structure single-port MMC'm1The maximum can be reached:
wherein: u shapedcIs the dc bus voltage.
(2) A dual-port MMC based on bridge arm multiplexing.
A dual-port MMC based on bridge arm multiplexing is shown in a dotted line frame at the right side of FIG. 1, wherein each phase is formed by connecting three bridge arms in series, and each bridge arm comprises NH2A half-bridge submodule and a bridge arm reactor, the middle bridge arm is a multiplexing bridge arm, and the chain of the multiplexing bridge arm and the upper and lower bridge armsThe joint is a voltage output point and forms the alternating current output of the dual-port MMC; compared with the traditional six-bridge arm MMC, the using quantity of 1/4 half-bridge submodules and bridge arm reactors is reduced, and two ports output phase voltage peak values Ujm1And Ujm2(j ═ a, b, c) are respectively:
wherein: m is1,m2The modulation ratios of the two-end AC output are respectively.
There are various modulation methods of the MMC based on the bridge arm multiplexing, and this embodiment is described by taking only one modulation method as an example, the modulation method is carrier-stacked PWM modulation: upper and lower bridge arm modulated waves are independent of each other, NH2The amplitude and the phase of each triangular carrier are the same, the vertical positions are different, the amplitude and the phase are compared to generate NH2A sub-module drive signal; for an upper bridge arm, when a modulation wave signal is greater than a carrier signal, a driving signal takes 1; when the modulation wave signal is smaller than the carrier signal, the drive signal takes 0; for a lower bridge arm, when the modulation wave signal is smaller than the carrier signal, the driving signal takes 1; when the modulation wave signal is greater than the carrier signal, the drive signal takes 0; for the common bridge arm, NH2The driving signal is controlled by N of the upper bridge armH2A drive signal and N of the lower bridge armH2The drive signals are obtained by an exclusive-or operation.
The amplitude and the phase of the dual-port MMC output phase voltage based on bridge arm multiplexing can be adjusted by controlling the parameters of a modulation wave, and if the port output phase voltage is respectively as follows:
then, the modulated waves of the upper and lower bridge arms can be respectively:
wherein: m is1And m2Is the modulation ratio, ω1And ω2In order to be the angular frequency of the frequency,
and
for the output voltage phase, the value of θ is equal to 0, -2 π/3, 2 π/3 when j is a, b, c, respectively.
Therefore, the amplitude and the phase of the output voltage of the dual-port MMC based on bridge arm multiplexing are determined by the modulation wave; therefore, the phase angle requirement that the phase angle difference between the two ports is 30 degrees can be met by adjusting the phases of the two modulation waves.
(3) A common dc bus.
The common direct current bus has the function of connecting a single-port MMC adopting a hybrid cascade structure and a dual-port MMC based on bridge arm interconnection, and the existence of the common direct current bus enables output ports on two sides of the direct current bus to be decoupled mutually, so that the independent control of the ports is facilitated.
The voltage grade of the public direct current bus depends on the voltage grade of a power distribution network connected with the three ports, and in the target application occasion of the topology, the three ports are connected with the power distribution network with the voltage grades of 10kV, 10kV and 20kV respectively; the hybrid cascade structure single-port MMC is connected with a 20 kV-level power distribution network, and the bridge arm interconnection dual-port MMC is connected with two 10 kV-level power distribution networks.
For the mixed cascade single-port MMC, the modulation method can be adopted to obtain the following steps:
wherein: u shapedcIs a DC bus voltage, Um1And outputting the phase voltage peak value for the port.
For the dual-port MMC based on bridge arm multiplexing, the modulation ratio m is 0.9
The following can be obtained:
wherein: u'jm1Is the peak value of the output phase voltage, U'dcIs the dc bus voltage.
Therefore, the voltage grade requirements of the two sides of the common direct current bus on the direct current bus are relatively close, and therefore the voltage U of the direct current bus can be takendcIs 28 kV.
If the left side of the direct current bus uses the traditional six-bridge arm MMC, the modulation ratio m is 0.9
The following can be obtained:
wherein: u shapem1Outputting a peak phase voltage, U, for a portdcIs the dc bus voltage.
For the dual-port MMC based on bridge arm multiplexing, the modulation ratio m is 0.9
The following can be obtained:
wherein: u'jm1Is the peak value of the output phase voltage, U'dcIs the dc bus voltage.
It can be seen that the DC bus voltage U is different from the DC bus voltage grade requirements on the two sides of the common DC busdcThe minimum voltage needs to be 37 kV.
According to the invention, under the condition that the right side ports are identical in structure and are based on bridge arm multiplexing dual-port MMC, the left side port of the topology adopts a mixed cascade structure, so that the requirement of the topology of the converter on the voltage level of the direct current bus is reduced, the voltage level of the direct current bus is similar to the voltage level required by two sides of the bus, the voltage utilization rate of the direct current bus is favorably improved, and the problem of mismatching of the voltage of the direct current bus caused by different voltage levels of a power grid is avoided; meanwhile, the topological direct-current bus has lower voltage level, and is beneficial to reducing the specification of the used switch tube or the number of sub-modules, thereby reducing the manufacturing cost of equipment.
The embodiments described above are presented to enable a person having ordinary skill in the art to make and use the invention. It will be readily apparent to those skilled in the art that various modifications to the above-described embodiments may be made, and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (3)
1. A three-port flexible multi-state switching device based on bridge arm multiplexing and hybrid cascading is characterized in that: the bridge arm multiplexing-based single-port MMC comprises a single-port MMC based on a hybrid cascade structure and a dual-port MMC based on bridge arm multiplexing, wherein the direct current sides of the two MMCs are connected through a common direct current bus;
the single-port MMC based on the hybrid cascade structure is of a three-phase six-bridge-arm structure, each bridge arm is sequentially cascaded by a plurality of half-bridge sub-modules and a bridge arm reactor, and three cross current sides are all connected with N in seriesFThe rear part of each H-bridge submodule is connected to the power distribution as an output portNetwork, NFIs a natural number greater than 0;
the double-port MMC based on bridge arm multiplexing is of a three-phase nine-bridge-arm structure, each phase is formed by connecting three bridge arms in series, each bridge arm is formed by sequentially cascading a plurality of half-bridge sub-modules and a bridge arm reactor, a middle bridge arm of each phase serves as a multiplexing bridge arm, a connection point of the three-phase multiplexing bridge arm and an upper bridge arm of the three-phase multiplexing bridge arm serves as one group of output ports, a connection point of the three-phase multiplexing bridge arm and a lower bridge arm of the three-phase multiplexing bridge arm serves as the;
the H-bridge submodule is composed of four power switches K1-K4 with reverse conducting capacity and a capacitor C2, one end of the power switch K1 is connected with one end of a power switch K2 and one end of a capacitor C2, the other end of the power switch K1 is connected with one end of a power switch K3 and serves as a connecting port A of the H-bridge submodule, the other end of the power switch K2 is connected with one end of a power switch K4 and serves as a connecting port B of the H-bridge submodule, the other end of the capacitor is connected with the other end of the power switch K3 and the other end of the power switch K4, and control ends of the four power switches K1-K4 are connected with switching signals provided by external equipment;
the target application occasion of the three-port flexible multi-state switching device is that three power distribution networks with 10kV, 10kV and 20kV voltage grades are connected, and 30 parts exist between the two 10kV power distribution networks°Phase angle difference of (2).
2. The three-port flexible multi-state switching device of claim 1, wherein: the half-bridge sub-module is composed of two power switches G1-G2 with reverse conducting capability and a capacitor C1, one end of the power switch G1 is connected with one end of the capacitor C1, the other end of the power switch G1 is connected with one end of the power switch G2 and serves as a connection port A of the half-bridge sub-module, the other end of the capacitor C1 is connected with the other end of the power switch G2 and serves as a connection port B of the half-bridge sub-module, and control terminals of the two power switches G1-G2 are connected with a switching signal provided by external equipment.
3. The three-port flexible multi-state switching device of claim 1, wherein: the power switches K1-K4 with reverse conducting capacity adopt IGBTs.
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| CN109980968B (en) * | 2019-03-20 | 2020-01-14 | 山东大学 | Modular multilevel converter, control system and application thereof |
| CN109995256B (en) * | 2019-03-20 | 2020-05-12 | 山东大学 | Nine-bridge arm modular multilevel converter with different bridge arm sub-modules, system and method |
| CN112152496B (en) * | 2020-09-18 | 2022-07-19 | 华北电力大学（保定） | Bridge arm multiplexing modular multilevel converter |
| CN112436746B (en) * | 2020-11-05 | 2021-09-21 | 吉林大学 | Modularized multi-level high-voltage electromagnetic transmitting circuit |
| CN112787528B (en) * | 2020-12-30 | 2022-12-20 | 国网河北省电力有限公司沧州供电分公司 | 9A-MMC control method and terminal equipment |
| CN113285619A (en) * | 2021-06-17 | 2021-08-20 | 上海交通大学 | Three-port modular multilevel converter based on full-bridge submodule and modulation method |
| CN113422518B (en) * | 2021-06-30 | 2022-08-16 | 天津大学 | Three-phase direct AC-AC converter topology based on MMC and control method thereof |
| CN114221564B (en) * | 2021-11-24 | 2024-02-02 | 西北工业大学 | Mixed MMC topological structure device based on bridge arm time-sharing multiplexing |
| CN114123338B (en) * | 2021-12-01 | 2023-08-08 | 山东大学 | Cube energy router and control method thereof |
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