CN110022077B - Power composite type modular multi-level solid-state transformer topological structure for alternating current-direct current hybrid power distribution network - Google Patents
Power composite type modular multi-level solid-state transformer topological structure for alternating current-direct current hybrid power distribution network Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
Abstract
The invention discloses a power composite type solid-state transformer topological structure for an alternating-current and direct-current hybrid power distribution network. A branch is led out from the middle point of each of the three-phase upper and lower bridge arms of the modular multilevel converter and is connected with the high-frequency transformer through a DC blocking capacitor to form a new high-frequency power circulation path, high-frequency components are simultaneously superposed in a target modulation signal, and the energy of the high-voltage side is led into the high-frequency transformer through the high-frequency circulation path in a high-frequency power form and is transmitted to the low-voltage side, so that the high-voltage side input stage and the middle-side isolation stage are subjected to integrated power conversion by adopting a power composite idea, the power conversion stage number is effectively reduced, the power conversion is more integrated. Meanwhile, the high-frequency transmission power in the invention can not flow to a high-voltage direct-current port or a fundamental frequency alternating-current port, and a trap constant-frequency selection device is not needed.
Description
Technical Field
The invention belongs to the technical field of high-voltage high-power electronics, and mainly relates to a power composite solid-state transformer topological structure for an alternating-current and direct-current hybrid power distribution network.
Background
In a traditional alternating-current power distribution network, a power transformer is a key device for realizing voltage grade conversion and electrical isolation, but due to the defects that the power transformer has single function, needs a large amount of magnetic materials, cannot be directly connected or used for processing direct-current form electric energy and the like, the requirements of a future intelligent power distribution network cannot be met, and therefore, a solid-state transformer based on a fully-controlled power electronic device is produced.
The solid-state transformer is also called a power electronic transformer, an electronic power transformer or an intelligent transformer, which is evaluated as one of ten most potential technologies by the MIT magazine in the united states in 2011, and is one of the key devices for realizing flexible energy routing in a future power distribution network. Compared with the traditional power transformer, the solid-state transformer has five advantages: 1) flexible and continuous input voltage/current and output voltage/current control capability, and bidirectional controllable power transmission; 2) the device has integrated power quality control capabilities of harmonic/reactive/unbalanced compensation, dynamic voltage recovery and the like; 3) the direct current type electric energy can be directly accessed and processed, and the flexible interconnection of an alternating current and direct current hybrid system is facilitated; 4) the system has full-power electronic fault management capability, short fault processing time and no need of an additional relay protection device; 5) the magnetic material is less in use, does not need transformer oil and is more environment-friendly.
However, the conventional solid-state transformer cannot completely replace the conventional power transformer, and the reason is mainly limited by the key problems of low power density, low transmission efficiency and the like, in addition to the high device cost caused by the manufacturing process of the power electronic device. At present, many researchers have proposed the topology of the solid-state transformer, but generally, the high-voltage side adopts a modular multilevel converter or a cascade H-bridge converter, the middle side adopts an ISOP or independent DAB converter to perform DC-DC conversion, the power conversion stages are too many, the volume of the whole device is large, and the efficiency is low. The invention patent CN 106787861A discloses a modular multilevel full-bridge resonance type power electronic transformer topology, wherein a high-frequency transmission path is constructed on each phase bridge arm of a star-connected cascade H-bridge, but the high-frequency transmission path does not have a high-voltage direct-current interface and cannot be directly connected with electric energy in a high-voltage direct-current form; the invention patent CN 107623456A discloses a multi-port power electronic transformer topology based on MMC and a control method thereof, the invention patent CN 107612407A discloses a high-power-density power electronic transformer topology structure and a control method thereof, the invention patent CN 108832825A discloses a high-power-density multi-port power electronic transformer topology, the three inventions patents lead out high-frequency power by constructing a high-frequency power circulation path, but all of the three inventions patents need to be provided with frequency selection devices such as a wave trap, a high-pass filter and the like to guide the power in high-frequency and low-frequency forms to circulate according to needs, and the cost is relatively high.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a power composite type modularized multi-level solid-state transformer topological structure for an alternating current-direct current hybrid power distribution network, aiming at the problems that the existing solid-state transformer has multiple conversion stages and low transmission efficiency, and the existing power composite type solid-state transformer depends on a frequency selection device.
The technical scheme is as follows: the invention relates to a power composite type modular multilevel solid-state transformer topological structure for an alternating current-direct current hybrid power distribution network, which comprises the following components: the modular multilevel converter is positioned on a high-voltage side, the high-frequency AC-DC converter is positioned on a middle side, and the inverter is positioned on a low-voltage side; the modular multilevel converter and the high-frequency AC-DC converter are both of a three-phase structure, and the phases of the modular multilevel converter and the high-frequency AC-DC converter are in one-to-one correspondence; each phase of the modular multilevel converter is provided with an upper bridge arm and a lower bridge arm, each upper bridge arm and each lower bridge arm are respectively provided with an upper sub-bridge arm and a lower sub-bridge arm, and each sub-bridge arm comprises a unit module and a filter inductor which are connected in series; the unit module comprises one or more cascaded sub-modules, and each sub-module is in a double half-bridge structure; in any phase of the modular multilevel converter, the upper end of an upper sub-bridge arm in an upper bridge arm is connected with the positive pole of the input end of the high-voltage direct-current power supply, the lower end of a lower sub-bridge arm in a lower bridge arm is connected with the negative pole of the input end of the high-voltage direct-current power supply, and the connecting point of the upper and lower bridge arms is connected with one phase port of the input end of the three-phase high-voltage alternating-; each phase of the high-frequency AC-DC converter comprises a blocking capacitor, a high-frequency transformer and an H-bridge rectifier; in any phase of the high-frequency AC-DC converter, the positive and negative poles of the primary side of the high-frequency transformer are bridged to two middle points of the upper and lower bridge arms of the corresponding phase in the modular multilevel converter through the serially connected blocking capacitors, and the positive and negative poles of the secondary side of the high-frequency transformer are bridged to two middle points of the left and right bridge arms of the H-bridge rectifier; and the middle point of the upper bridge arm and the middle point of the lower bridge arm of the H-bridge rectifier in each phase of the high-frequency AC-DC converter are respectively connected to the anode and the cathode of the inverter.
Further, the inverter is in a three-phase four-wire half-bridge structure and is used for converting a low-voltage direct current signal into a low-voltage alternating current signal.
Furthermore, the low-voltage side also comprises a parallel capacitor, and two ends of the parallel capacitor are respectively connected to the anode and the cathode of the inverter.
Furthermore, in each phase of the high-voltage side, the superposed high-frequency components of the two groups of sub-bridge arms in the upper bridge arm and the lower bridge arm are the same in amplitude and opposite in phase, and the superposed high-frequency components of the lower sub-bridge arm in the upper bridge arm and the superposed high-frequency components of the upper sub-bridge arm in the lower bridge arm are the same in amplitude and phase.
further, the DC blocking capacitor in the middle-side high-frequency AC-DC converter can not only prevent electric energy in a direct current form from flowing into a high-frequency path, but also form an L C resonant circuit in combination with the filter inductor in each sub-arm.
Has the advantages that: compared with the prior art, the invention is mainly characterized in that the high-voltage side modular multilevel converter and the middle side high-frequency AC-DC converter are subjected to integrated power conversion by adopting a power composite idea, and a new high-frequency power flow path is planned, so that the high-voltage side input stage and the middle side isolation stage are integrated, the power conversion stage number is effectively reduced, and the power conversion is more integrated; meanwhile, the superposed high-frequency components effectively utilize the combination characteristics of common-mode components and differential-mode components, so that the high-frequency components present common-mode properties for the high-frequency components and differential-mode properties for high-voltage direct-current and high-voltage fundamental-frequency alternating-current ports.
Therefore, the invention can directly access and process the electric energy in the form of direct current; the newly planned high-frequency power circulation path does not affect the high-voltage direct current port or the fundamental frequency alternating current port, an additional frequency selection device is not needed, and the cost is lower; the power conversion stage number can be effectively reduced, so that the power conversion is more integrated, the power density is further improved, and the power transmission efficiency is further improved.
Drawings
Fig. 1 is a topological structure diagram of a power composite type modular multilevel solid-state transformer facing an alternating current and direct current hybrid power distribution network;
FIG. 2 is a block diagram of a high voltage side modular multilevel cell module;
Fig. 3 is a schematic diagram of the superposition of high-frequency modulation components.
Detailed Description
The technical solution of the present invention is explained in detail below with reference to the accompanying drawings.
As shown in fig. 1, the power composite modular multilevel solid-state transformer topology of the present invention includes: a modular multilevel converter at the high-voltage side, a high-frequency AC-DC converter at the middle side and an inverter at the low-voltage side. The modular multilevel converter is used for converting high-voltage three-phase alternating current or high-voltage direct current into high-voltage high-frequency alternating current. The middle-side high-frequency AC-DC converter is used for converting high-voltage high-frequency alternating current obtained by the modular multilevel converter into low-voltage direct current. The inverter is in a three-phase four-wire half-bridge structure and is used for converting low-voltage direct current into three-phase four-wire low-voltage alternating current. The modular multilevel converter and the high-frequency AC-DC converter are both of a three-phase structure, and the phases of the modular multilevel converter and the high-frequency AC-DC converter are in one-to-one correspondence.
The high-voltage side modular multilevel converter comprises a high-voltage alternating current voltage source input end, a plurality of unit modules and a plurality of filter inductors. Each phase of the modular multilevel converter is provided with an upper bridge arm and a lower bridge arm, the upper bridge arm and the lower bridge arm are respectively provided with an upper sub-bridge arm and a lower sub-bridge arm, and each sub-bridge arm comprises a unit module and a filter inductor which are connected in series. The unit module includes one or more cascaded submodules, each submodule is in a double-half-bridge structure, as shown in fig. 2, the double-half-bridge submodule is formed by connecting two half-bridges in series, the direct current negative electrode of the upper half-bridge is connected with the direct current positive electrode of the lower half-bridge, and the alternating current outputs of the two half-bridges are used as the alternating current outputs of the submodules. Because the voltage output range of the sub-module is increased by the double half-bridge structure, the voltage output capability of the unit modules can be increased under the condition that the number of the unit modules is not increased, and high-frequency voltage equivalent to the amplitude of fundamental frequency voltage can be provided. In any phase of the modular multilevel converter, the upper end of an upper sub-bridge arm in an upper bridge arm is connected with the positive electrode (namely a positive bus of a high-voltage direct-current power supply) of the input end of the high-voltage direct-current power supply, the lower end of a lower sub-bridge arm in a lower bridge arm is connected with the negative electrode (namely the positive bus of the high-voltage direct-current power supply) of the input end of the high-voltage direct-current power supply, and the connecting point of the upper and lower bridge arms is.
The middle side high-frequency AC-DC converter comprises three blocking capacitors, three single-phase high-frequency transformers and three single-phase H-bridge rectifiers. The three blocking capacitors, the three single-phase high-frequency transformers and the three single-phase H-bridge rectifiers belong to three phases, and each phase comprises one blocking capacitor, one single-phase high-frequency transformer and one single-phase H-bridge rectifier. One end of each of three DC blocking capacitors is connected with the midpoint of the three-phase upper bridge arm of the high-voltage side modular multilevel converter (namely the connection point of the upper and lower two sub-bridge arms in each upper bridge arm of the three-phase), the other end of each DC blocking capacitor is connected with the upper end of the primary side of the high-frequency transformer, the lower ends of the primary sides of the three high-frequency transformers are respectively connected with the midpoint of the three-phase lower bridge arm of the high-voltage side modular multilevel converter (namely the connection point of the upper and lower two sub-bridge arms in each lower bridge arm of the three-phase), a high-frequency power circulation path is formed, and the upper and lower ends of the secondary sides. In other embodiments, one end of each of the three blocking capacitors may be connected to a midpoint of a lower three-phase bridge arm of the high-voltage side modular multilevel converter, the other end of each of the three blocking capacitors may be connected to a lower end of a primary side of the high-frequency transformer, upper ends of the primary sides of the three high-frequency transformers may be connected to midpoints of upper three-phase bridge arms of the high-voltage side modular multilevel converter, respectively, to form a high-frequency power circulation path, and secondary ends of the three high-frequency transformers may be connected to midpoints of left and right bridge arms of the. The middle point of the upper bridge arm and the middle point of the lower bridge arm of the H-bridge rectifier in each phase of the high-frequency AC-DC converter are respectively connected to the positive pole and the negative pole of the low-voltage side inverter.
The high-voltage side modularized multi-level converter and the middle side high-frequency AC-DC converter carry out integrated power conversion by adopting a power composite idea, and energy on the high-voltage side is introduced into the high-frequency AC-DC transformer through the high-frequency power circulation path in a high-frequency power form by constructing a new high-frequency power circulation path (namely, the path from the middle point of an upper bridge arm and a lower bridge arm to the high-frequency AC-DC transformer through a blocking capacitor) and simultaneously superposing high-frequency components in a target modulation signal, so that the transmission power of the high-voltage side input stage and the middle side isolation stage is composited together, the power conversion stage number is effectively reduced, and the power conversion is more integrated.
In addition, the high-voltage side modular multilevel converter has three phases which are symmetrical and equal, in each phase of the high-voltage side, the superposed high-frequency components of the two groups of sub-bridge arms in the upper bridge arm and the lower bridge arm have the same amplitude and opposite phases, and the superposed high-frequency components of the lower sub-bridge arm in the upper bridge arm and the superposed high-frequency components of the upper sub-bridge arm in the lower bridge arm have the same amplitude and phases, as shown in fig. 3. Thus, no additional frequency selection device (such as a wave trap, a low-pass filter, etc.) is needed on the high-voltage side to prevent the high-frequency alternating current from entering the high-voltage fundamental frequency alternating current and high-voltage direct current ports, so that the transmitted high-frequency power does not affect the high-voltage direct current ports nor the fundamental frequency alternating current ports.
the blocking capacitor in the middle high-frequency AC-DC converter can not only prevent direct-current electric energy from flowing into a high-frequency path, but also be combined with the sub-bridge arm inductor to form an L C resonant circuit.
The low-voltage side comprises a parallel capacitor besides the inverter, two ends of the parallel capacitor are respectively connected to the anode and the cathode of the inverter, and the parallel capacitor plays a role in direct-current voltage stabilization.
The inverter on the low-voltage side is used for converting low-voltage direct current into low-voltage alternating current, so that the topology has four universal ports of high-voltage alternating current, high-voltage direct current, low-voltage alternating current and low-voltage direct current, and is suitable for an alternating-current and direct-current hybrid power distribution network.
Claims (5)
1. A power composite type modular multilevel solid-state transformer topological structure facing an alternating current-direct current hybrid power distribution network comprises a modular multilevel converter positioned at a high-voltage side, a high-frequency AC-DC converter positioned at a middle side and an inverter positioned at a low-voltage side; the modular multilevel converter and the high-frequency AC-DC converter are both of a three-phase structure, and the phases of the modular multilevel converter and the high-frequency AC-DC converter are in one-to-one correspondence;
Each phase of the modular multilevel converter is provided with an upper bridge arm and a lower bridge arm, each upper bridge arm and each lower bridge arm are respectively provided with an upper sub-bridge arm and a lower sub-bridge arm, and each sub-bridge arm comprises a unit module and a filter inductor which are connected in series; the unit module comprises one or more cascaded sub-modules, and each sub-module is in a double half-bridge structure; the double-half-bridge structure is formed by connecting two half-bridges in series, the direct current negative electrode of the upper half-bridge is connected with the direct current positive electrode of the lower half-bridge, and the alternating current outputs of the two half-bridges are used as the alternating current outputs of the sub-modules; in any phase of the modular multilevel converter, the upper end of an upper sub-bridge arm in an upper bridge arm is connected with the positive pole of the input end of the high-voltage direct-current power supply, the lower end of a lower sub-bridge arm in a lower bridge arm is connected with the negative pole of the input end of the high-voltage direct-current power supply, and the connecting point of the upper and lower bridge arms is connected with one phase port of the input end of the three-phase high-voltage alternating-;
Each phase of the high-frequency AC-DC converter comprises a blocking capacitor, a high-frequency transformer and an H-bridge rectifier; in any phase of the high-frequency AC-DC converter, the positive and negative poles of the primary side of the high-frequency transformer are bridged to two middle points of the upper and lower bridge arms of the corresponding phase in the modular multilevel converter through the serially connected blocking capacitors, and the positive and negative poles of the secondary side of the high-frequency transformer are bridged to two middle points of the left and right bridge arms of the H-bridge rectifier; and the middle point of the upper bridge arm and the middle point of the lower bridge arm of the H-bridge rectifier in each phase of the high-frequency AC-DC converter are respectively connected to the anode and the cathode of the inverter.
2. The power composite modular multilevel solid-state transformer topology structure oriented to the alternating current-direct current hybrid power distribution network according to claim 1, characterized in that: the inverter is in a three-phase four-wire half-bridge structure and is used for converting a low-voltage direct current signal into a low-voltage alternating current signal.
3. The power composite modular multilevel solid-state transformer topology structure oriented to the alternating current-direct current hybrid power distribution network according to claim 1, characterized in that: the low-voltage side further comprises a parallel capacitor, and two ends of the parallel capacitor are connected to the positive electrode and the negative electrode of the inverter respectively.
4. The power composite modular multilevel solid-state transformer topology structure oriented to the alternating current-direct current hybrid power distribution network according to claim 1, characterized in that: in each phase of the high-voltage side, the superposed high-frequency components of the two groups of sub bridge arms in the upper bridge arm and the lower bridge arm are the same in amplitude and opposite in phase, and the superposed high-frequency components of the lower sub bridge arm in the upper bridge arm and the superposed high-frequency components of the upper sub bridge arm in the lower bridge arm are the same in amplitude and phase.
5. the topological structure of the power composite type modular multilevel solid-state transformer oriented to the alternating current-direct current hybrid power distribution network according to claim 1, wherein the DC blocking capacitor in the high-frequency AC-DC converter at the middle side can not only prevent electric energy in a direct current form from flowing into a high-frequency path, but also can be combined with the filter inductor in each sub-bridge arm to form an L C resonant circuit.
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| PL2898595T3 (en) * | 2012-10-11 | 2020-06-01 | Siemens Aktiengesellschaft | Modulat multilevel dc/dc converter for hvdc applications |
| CN205356152U (en) * | 2016-01-04 | 2016-06-29 | 中国石油大学(华东) | Three rows formula DCDC converter based on many level of modularization |
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| US9893633B1 (en) * | 2016-03-23 | 2018-02-13 | The Florida State University Research Foundation, Inc. | Modular multilevel DC-DC converter and associated method of use |
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| CN107863884A (en) * | 2017-11-07 | 2018-03-30 | 清华大学 | A kind of multiple module commutator transformer |
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Effective date of registration: 20201210 Address after: No.38 Gongnong East Road, Xiannv Town, Jiangdu District, Yangzhou City, Jiangsu Province 225200 Patentee after: YANGZHOU YONGMAO ELECTRIC POWER CONSTRUCTION Co.,Ltd. Patentee after: YANGZHOU JIANGDU DISTRICT POWER SUPPLY BRANCH OF STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. Address before: 210024, No. 122, Ning Hai Road, Gulou District, Jiangsu, Nanjing Patentee before: NANJING NORMAL University |