CN212111631U - Testing device for distributed energy consumption device of flexible direct current transmission system - Google Patents
Testing device for distributed energy consumption device of flexible direct current transmission system Download PDFInfo
- Publication number
- CN212111631U CN212111631U CN202020413802.6U CN202020413802U CN212111631U CN 212111631 U CN212111631 U CN 212111631U CN 202020413802 U CN202020413802 U CN 202020413802U CN 212111631 U CN212111631 U CN 212111631U
- Authority
- CN
- China
- Prior art keywords
- energy consumption
- valve section
- distributed energy
- voltage
- direct current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model discloses a testing device of a distributed energy consumption device of a flexible direct current transmission system, which comprises a first testing valve section, a second testing valve section, an energy supplementing module, a load inductor L1, a current limiting inductor L2, an alternating current power supply, a transformer T, a rectifying circuit, a charging loop switch S1 and an energy supplementing module switch S2; the first test valve section and the second test valve section both comprise a plurality of cascaded power modules; enabling the voltage of the distributed energy consumption valve section to reach the rated voltage through the first test valve section and the second test valve section, and then testing the steady-state voltage-sharing capability of the distributed energy consumption device by switching in or switching off an energy-discharging branch in the distributed energy consumption module; and testing the capability of the distributed energy consumption device for inhibiting the direct-current voltage by adjusting the voltage set value of the energy consumption module. The circuit of the testing device is simple, easy to realize and convenient to operate.
Description
Technical Field
The utility model belongs to the technical field of flexible direct current transmission, concretely relates to flexible direct current transmission system distributing type power consumption device's test device.
Background
The breadth of our country is broad, the wind resource is rich, and the situation of energy shortage in our country can be well relieved by sending out wind power. For the far-sea wind power transmission, flexible direct-current power transmission becomes the optimal solution of the existing wind power transmission. The new energy wind power generation is connected to the grid through a flexible direct current transmission system, when an alternating current fault occurs in a receiving end power grid, direct current voltage rises due to the rise of voltage of a converter valve energy accumulation module, the wind power generator is slow in action time due to an inertia link, and in order to match with the action of a fan, an energy consumption device needs to be configured to limit the rise of the direct current voltage, so that the safety of the converter valve is protected. The distributed energy consumption device becomes the energy consumption priority due to the advantages of low current change rate, low voltage change rate, no need of consistent triggering of energy consumption modules, simple and convenient energy taking power supply, high development and design inheritance and the like. The distributed energy consumption device needs to be fully tested and verified in the design process, and the distributed energy consumption device is lack of a corresponding testing device because of late research starting. If the distributed energy consumption device is matched with the converter valve in the test, a large capacity needs to be configured for a test system when extreme energy consumption is verified, and many factories hardly meet the requirement, and the test system is complex, has high operation difficulty and high risk, so that an economical, convenient and easy-to-implement method is urgently needed for solving the problem of the test of the distributed energy consumption device, meeting the function test of the distributed energy consumption device and testing the steady-state voltage-sharing capability and the capability of inhibiting direct-current voltage of the distributed energy consumption device.
Disclosure of Invention
The utility model provides a flexible direct current transmission system distributing type power consumption device's test device to carry out abundant experimental verification to distributing type power consumption device in the design process.
In order to achieve the above object, the utility model relates to a test device of flexible direct current transmission system distributed energy consumption device, including first test valve section, second test valve section, energy supplementing module, load inductance L1, current limiting inductance L2, alternating current power supply, transformer T, rectifier circuit, charging loop switch S1 and energy supplementing module switch S2; the first test valve section and the second test valve section both comprise a plurality of cascaded power modules;
the alternating current power supply is converted into direct current voltage through a transformer T and a rectifying circuit, a first test valve section forms a first branch circuit, a second test valve section is connected with an energy supplementing module in series to form a second branch circuit, a distributed energy consumption valve section to be tested is connected with a current limiting inductor L2 in series to form a third branch circuit, the first branch circuit and the third branch circuit are connected in parallel and then connected with the second branch circuit in parallel through a load inductor L1 to form a parallel branch circuit, and the parallel branch circuit is then connected with the direct current side of the rectifying circuit in parallel through a charging switch S1; the energy supplementing module 9 is connected in parallel to the direct current side of the rectifying circuit through an energy supplementing diode D2 and an energy supplementing switch S2.
Furthermore, the power module comprises a capacitor C and two IGBTs, a diode D is connected in parallel at two ends of each IGBT in a reverse mode, and the capacitor C is connected in parallel at two ends of a branch formed by connecting the two IGBTs.
Furthermore, the energy supplementing module comprises a capacitor C9, an IGBT T91 and an IGBT T92, two ends of the IGBT T91 and two ends of the IGBT T92 are respectively connected with a diode D91 and a diode D912 in a reverse parallel mode, and a capacitor C9 is connected in parallel with two ends of a branch formed by connecting the IGBT T91 and the IGBT T92.
Further, a capacitor C9 of the energy supplementing module is connected in parallel to the dc side of the rectifier circuit through an energy supplementing diode D2 and an energy supplementing switch S2.
Further, the transformer T is a step-up split transformer.
Further, a current limiting resistor R1 is connected between the parallel branch and the charging switch S1.
Compared with the prior art, the utility model discloses following profitable technological effect has at least:
the testing of the distributed energy consumption device of the flexible direct current transmission system comprises the steps that the voltage of the distributed energy consumption valve section reaches a rated voltage through a first testing valve section and a second testing valve section, and then the steady state voltage-sharing capability of the distributed energy consumption device is tested by switching in or switching off an energy-discharging branch in a distributed energy consumption module; and testing the capability of the distributed energy consumption device for inhibiting the direct-current voltage by adjusting the voltage set value of the energy consumption module. The circuit of the testing device is simple, easy to realize and convenient to operate.
Further, a capacitor C9 of the energy supplementing module is connected in parallel to the dc side of the rectifier circuit through an energy supplementing diode D2 and an energy supplementing switch S2. Ensuring that the power flows to the system.
Furthermore, the transformer is a boosting split transformer, the primary side of the transformer can adopt low-voltage conventional electricity (380V) and the secondary side of the transformer adopts electricity with higher voltage so as to meet the voltage requirement of the test platform, and the split transformer can raise the voltage through voltage superposition;
furthermore, a current limiting resistor R1 is connected between the parallel branch and the charging switch S1, and the current limiting resistor R1 limits the current of the charging loop, so that the current is not too large in the charging process, and the test equipment is protected.
Drawings
FIG. 1 is a test topology diagram of a distributed energy consumption device of a flexible direct current transmission system;
fig. 2 shows port voltages of two test valve sections of the distributed energy consumption device of the flexible direct current transmission system according to the embodiment of the present invention;
fig. 3 shows two test valve segment module voltages of the distributed energy consumption device of the flexible direct current transmission system according to the embodiment of the present invention;
fig. 4 is a voltage of a distributed energy consumption valve section of a distributed energy consumption device of a flexible direct current transmission system according to an embodiment of the present invention;
fig. 5 is a load inductance current of a distributed energy consumption device of a flexible direct current transmission system according to an embodiment of the present invention;
fig. 6 is a distributed energy consumption valve section current of a distributed energy consumption device of a flexible direct current transmission system according to an embodiment of the present invention;
fig. 7 shows the power of the distributed energy consumption device of the flexible dc power transmission system according to an embodiment of the present invention;
fig. 8 is the embodiment of the present invention provides a primary side and secondary side current of a transformer of a distributed energy consumption device of a flexible direct current transmission system.
In the drawings: 1-alternating current power supply, 2-transformer, 3-rectifying circuit, 7-first test valve section, 8-second test valve section, 9-energy supplementing module, 12-distributed energy consumption valve section;
in fig. 2 to 8, the abscissa is time in seconds.
Detailed Description
In order to make the purpose and technical scheme of the utility model clearer and more convenient to understand. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for the purpose of illustration only and are not intended to be limiting.
Referring to fig. 1, a test device topology of a distributed energy consumption device of a flexible direct current transmission system includes a distributed energy consumption valve section 8, a first test valve section 7, a second test valve section 8, an energy supplement module 9, a load inductor L1, a current limiting inductor L2, a current limiting resistor R1, an alternating current power supply 1, a transformer T, a rectifier circuit 3, a charging loop switch S1, an energy supplement module switch S2, and an energy supplement diode D2; the distributed energy consumption valve section 12 of the topology comprises 6 cascaded distributed energy consumption modules; the first test valve section and the second test valve section respectively comprise 6 cascaded power modules, and the power modules are full-bridge modules or half-bridge modules; the half-bridge module comprises a capacitor C, an IGBT T71 and an IGBT T72, two ends of each of the IGBT T71 and the IGBT T72 are connected with a diode D in a reverse parallel mode, an emitter of the IGBT T71 is connected with a collector of the IGBT T72, and the capacitor C is connected with two ends of a branch formed by the two IGBTs in parallel.
The distributed energy consumption valve section to be tested and the current limiting inductor are connected in series and then bridged between the first test valve section and the second test valve section. The energy supplementing module 9 comprises a capacitor C9, an IGBT T91 and an IGBT T92, two ends of the IGBT T91 and two ends of the IGBT T92 are respectively connected with a diode D91 and a diode D912 in a reverse parallel mode, an emitter of the IGBT T91 is connected with a collector of the IGBT T92, and the capacitor C9 is connected with two ends of a branch formed by the IGBT T91 and the IGBT T92 in a parallel mode.
An alternating current power supply 1 of the test device is converted into direct current voltage through a transformer T and a rectifying circuit 3; a first test valve section 7 of the test device forms a first branch circuit, a second test valve section 8 and an energy supplementing module 9 are connected in series to form a second branch circuit, a distributed energy consumption valve section 12 and a current limiting inductor L2 are connected in series to form a third branch circuit, the first branch circuit and the third branch circuit are connected in parallel, then connected in parallel with the second branch circuit through a load inductor L1, and then connected in parallel with the direct current side of the rectifying circuit 3 through a current limiting resistor R1 and a charging switch S1; the capacitor C9 of the energy compensating module 9 of the test device is connected in parallel to the dc side of the rectifier circuit through the energy compensating diode D2 and the energy compensating switch S2. The transformer is a boosting split transformer, the primary side of the transformer can adopt low-voltage conventional electricity (380V), the secondary transformer of the transformer adopts electricity with higher voltage so as to meet the voltage requirement of a test platform, and the split transformer can raise the voltage through voltage superposition; the alternating current side of the rectifying circuit is connected in parallel, and the direct current side of the rectifying circuit is connected in series.
A method for testing a distributed energy consumption device of a flexible direct current transmission system by using the device comprises an uncontrolled charging stage, a cyclic charging stage, an unlocking operation boosting stage and a steady state voltage-sharing stage, wherein a distributed energy consumption valve section 12 is synchronously electrified along with a test valve section, and when two test valve sections are unlocked and operated, the distributed energy consumption valve section carries out a steady state voltage-sharing test according to requirements.
In an uncontrolled charging stage, the voltage of the rectified alternating current power supply is evenly distributed to each module of the two test valve sections and the distributed energy consumption valve section, and the voltage of a module capacitor needs to enable the energy taking power supply to be reliably electrified;
in the cyclic charging stage, the power supply charges the two test valve sections and the energy supplementing module one to one;
in the unlocking operation boosting and current rising stage, the voltages of the two test valve sections are power frequency sinusoidal voltages with positive bias, and when the voltage of the port of any one test valve section is higher than the sum of the voltages of the distributed energy consumption modules of the distributed energy consumption valve sections, the energy consumption modules are charged; when the port voltage of any test valve section is lower than the sum of the module voltages of the distributed energy consumption valve sections, a through-current diode D1 in the distributed energy consumption module bears back pressure and is cut off, and the distributed energy consumption valve sections do not discharge electricity to any test valve section; the port voltage of the first test valve section only comprises the port voltage of the first test valve section, and the port voltage of the test valve section 2 is the sum of the voltage of the second test valve section and the energy supplementing module 9.
And in the steady-state voltage-sharing stage, when the voltage of the distributed energy consumption modules of the distributed energy consumption valve section is higher than the upper limit of the set value, the high-voltage energy consumption modules discharge electricity through the energy consumption resistor R1, and when the voltage of the energy consumption modules discharges electricity to the lower limit of the set value, the discharge is stopped. And (5) repeating the circulation to simulate a steady-state pressure-equalizing test of the distributed energy consumption valve section.
A method for testing a distributed energy consumption device of a flexible direct current transmission system by using the device comprises the following steps:
step 1, in an uncontrolled charging stage, disconnecting an energy supplementing module switch S2, closing a charging switch S1, raising the voltage of an alternating current power supply, carrying out uncontrolled charging, limiting the current of a charging loop by a current limiting resistor R1, enabling the current not to be too large in the charging process, and protecting test equipment; the module voltages of the two test valve sections are raised until the energy-taking power supply can be stably electrified, at the moment, the first test valve section, the second test valve section, the energy supplementing module 9 and the distributed energy consumption valve section 12 which are connected in series are connected in parallel, and the modules of the three valve sections respectively and evenly distribute the voltages output by the rectifying circuit;
and 2, in a cyclic charging stage, reducing the voltage of the alternating current power supply to enable the output voltage of the rectifying circuit to be the same as the voltage of the first test valve section module, switching the two test valve sections into a one-to-one cyclic charging mode, wherein the port voltages of the two test valve sections are lower than the sum of the voltages of the distributed energy consumption valve section modules, a through diode D1 in the distributed energy consumption module bears the reverse voltage and is cut off, the two test valve sections do not charge the distributed energy consumption valve section modules, the distributed energy consumption modules are in a self-discharging state, and the voltages of the distributed energy consumption modules are basically unchanged in a short. In the cycle charging stage, the power supply voltage can be reduced, the next unlocking stage is facilitated, the instantaneous impact of unlocking is reduced, the main purpose is to ensure that the whole system can be stably carried out, and the safety of equipment can be endangered by large impact.
Step 3, in an unlocking operation boosting and current rising stage, a charging loop switch S1 is disconnected, an energy supplementing module switch S2 is closed, two test valve sections are unlocked and operated, the alternating current power supply voltage and the slope of a phase angle between the two test valve sections are synchronously controlled to rise, so that the module voltage of the two test valve sections, the voltage of a distributed energy consumption module and the current of a load inductor L1 rise to set values, and when the voltage of a port of any one test valve section is higher than the sum of the voltages of the distributed energy consumption modules, in order to prevent current impact, the charging current of the distributed energy consumption valve sections is limited by a current limiting inductor L2;
and 4, in a steady-state pressure equalizing stage, after the two test valve sections operate stably, enabling a pressure equalizing control strategy of the distributed energy consumption valve sections to carry out a steady-state pressure equalizing test.
Fig. 2-8 are the simulation results provided by the embodiment of the present invention, the simulation results are divided into four stages, which are respectively the uncontrolled charging stage, the cyclic charging stage, the step-up and flow-up stage of the unlocking operation and the steady-state voltage-sharing stage, and four stages are described in turn below.
0-0.5S is an uncontrolled charging stage, a charging loop switch S1 is closed, an energy supplementing module switch S2 is disconnected, the power supply voltage is raised, the output voltage of the rectifying circuit is 3kV, the voltage of a first test valve section module is 0.5kV, the voltage of a distributed energy consuming valve section module is 0.5kV, the module voltage is 0.43kV because a second test valve section is cascaded with an energy supplementing module 9, and the output voltage of the rectifying circuit is reduced to 0.5kV by adjusting the alternating current power supply voltage before uncontrolled charging is finished;
the cyclic charging stage is 0.5-2 s, the cyclic charging is that the power supply charges the two test valve sections and the energy supplementing module one to one, the voltage of the first test valve section module is basically equivalent to that of the rectifying circuit, the module voltage of the first test valve section is basically maintained at 0.5kV, the module voltage of the second test valve section and the energy supplementing module is lower than the rectifying current voltage, and the module voltage of the second test valve section and the energy supplementing module is raised to 0.5 kV;
2-8 s is a step-up and flow-up stage of unlocking operation, and the voltage of the alternating current power supply and the slope of a phase angle between the two test valve sections are synchronously controlled to rise, so that the module voltage of the two test valve sections, the voltage of the distributed energy consumption module and the voltage of the energy supplementing module 9 are raised to 2.1 kV;
8-20 s are steady-state voltage-sharing stages, wherein 8-12 s distributed energy consumption valve sections do not enable a control strategy, the module voltage of the distributed energy consumption valve sections is about 2.1kV, the distributed energy consumption valve section control strategy is enabled after 12s, 12-14 s maintain the voltage set value of the distributed energy consumption modules at 2.1kV, 14-16 s change the voltage set value of the distributed energy consumption modules to 2.0kV, 16-18 s change the voltage set value of the distributed energy consumption modules to 1.9kV, and 18-20 s change the voltage set value of the distributed energy consumption modules to 1.8 kV; when the voltage of a certain distributed energy consumption module is 1.05 times higher than a set value, an energy discharging branch of the distributed energy consumption module is put into use, the energy discharging branch comprises an IGBT T12, a diode D12 and an energy discharging resistor R12, the energy discharging branch is disconnected when the voltage of the distributed energy consumption module is reduced to 0.95 time of the set value, the voltage of the distributed energy consumption module is maintained within an interval of 0.95-1.05 times of the set value, and the steady-state voltage-sharing capability of the distributed energy consumption device is embodied; as the voltage set value of the energy consumption module is reduced, the maximum voltage of the ports of the two test valve sections, the voltage of the modules of the two test valve sections, the voltage of the energy supplementing module and the load inductive current are all reduced, and the capability of the distributed energy consumption device for inhibiting the direct-current voltage is embodied; along with the reduction of the voltage set value of the energy consumption module, the current of the distributed energy consumption device, the power supply power and the primary and secondary side currents of the transformer are increased, and the energy consumption capacity of the distributed energy consumption device is embodied.
Finally, it should be noted that: the technical solutions of the present invention are only described in connection with the above embodiments, and not limited thereto. Those of ordinary skill in the art will understand that: modifications and equivalents of the embodiments of the invention, such as the replacement of half-bridge modules in the test valve section with full-bridge modules, clamping dual sub-modules, etc., may be made by those skilled in the art, but such modifications and changes are within the scope of the claims of the present application.
Claims (6)
1. The testing device for the distributed energy consumption device of the flexible direct current transmission system is characterized by comprising a first testing valve section (7), a second testing valve section (8), an energy supplementing module (9), a load inductor L1, a current limiting inductor L2, an alternating current power supply, a transformer T, a rectifying circuit (3), a charging loop switch S1 and an energy supplementing module switch S2; the first test valve section (7) and the second test valve section (8) both comprise a plurality of cascaded power modules;
the alternating current power supply is converted into direct current voltage through a transformer T and a rectifying circuit (3), a first test valve section (7) forms a first branch circuit, a second test valve section (8) is connected with an energy supplementing module (9) in series to form a second branch circuit, a distributed energy consumption valve section (12) to be tested is connected with a current limiting inductor L2 in series to form a third branch circuit, the first branch circuit and the third branch circuit are connected in parallel and then connected with the second branch circuit through a load inductor L1 to form a parallel branch circuit, and the parallel branch circuit is connected with the direct current side of the rectifying circuit (3) in parallel through a charging switch S1; the energy supplementing module (9) is connected in parallel to the direct current side of the rectifying circuit through an energy supplementing diode D2 and an energy supplementing switch S2.
2. The testing device for the distributed energy consumption devices of the flexible direct current transmission system according to claim 1, wherein the power module comprises a capacitor C and two IGBTs, a diode D is connected in parallel and in reverse at two ends of each IGBT, and the capacitor C is connected in parallel at two ends of a branch formed by connecting the two IGBTs.
3. The testing device of the distributed energy consumption devices of the flexible direct current transmission system according to claim 1, wherein the energy supplementing module (9) comprises a capacitor C9, an IGBT T91 and an IGBT T92, a diode D91 and a diode D912 are respectively connected in parallel at two ends of the IGBT T91 and the IGBT T92 in a reverse mode, and a capacitor C9 is connected in parallel at two ends of a branch formed by connecting the IGBT T91 and the IGBT T92.
4. The testing device for the distributed energy consumption devices of the flexible direct current transmission system according to claim 3, wherein the capacitor C9 of the energy supplementing module (9) is connected in parallel to the direct current side of the rectifying circuit through an energy supplementing diode D2 and an energy supplementing switch S2.
5. The testing device for the distributed energy consumption devices of the flexible direct current transmission system according to claim 1, wherein the transformer T is a boost split transformer.
6. The testing device for the distributed energy consumption devices of the flexible direct current transmission system according to claim 1, wherein a current limiting resistor R1 is connected between the parallel branch and the charging switch S1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020413802.6U CN212111631U (en) | 2020-03-26 | 2020-03-26 | Testing device for distributed energy consumption device of flexible direct current transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020413802.6U CN212111631U (en) | 2020-03-26 | 2020-03-26 | Testing device for distributed energy consumption device of flexible direct current transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212111631U true CN212111631U (en) | 2020-12-08 |
Family
ID=73637735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020413802.6U Active CN212111631U (en) | 2020-03-26 | 2020-03-26 | Testing device for distributed energy consumption device of flexible direct current transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212111631U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834858A (en) * | 2021-01-29 | 2021-05-25 | 国网江苏省电力有限公司电力科学研究院 | On-site detection method for direct-current energy consumption device |
-
2020
- 2020-03-26 CN CN202020413802.6U patent/CN212111631U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834858A (en) * | 2021-01-29 | 2021-05-25 | 国网江苏省电力有限公司电力科学研究院 | On-site detection method for direct-current energy consumption device |
| CN112834858B (en) * | 2021-01-29 | 2023-04-14 | 国网江苏省电力有限公司电力科学研究院 | On-site detection method for direct current energy consumption device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10483788B2 (en) | Charging method for sub-module based hybrid converter | |
| CN106712248B (en) | The charging method of one seed module mixed type inverter | |
| CN103944180B (en) | Hybrid energy-storing wind light mutual complementing grid-connected system based on solid-state transformer | |
| CN103236706A (en) | Battery energy storage system based on modular multilevel AC-AC (Alternating Current-Alternating Current) converter topology | |
| CN105191108A (en) | Converter | |
| CN111273113A (en) | Testing device and testing method for distributed energy consumption device of flexible direct current transmission system | |
| CN103915856B (en) | A kind of base station is grid-connected-charging photovoltaic micro-inverter system and control method thereof | |
| CN102255542A (en) | Single-stage boosting inverter with tap inductor | |
| CN103441691A (en) | Resonance-type power electronic current transformer and current transformer device | |
| CN104410260A (en) | Fault-tolerance-capability-equipped MMC sub-module structure capable of realizing DC fault self-protection, and MMC modulation method thereof | |
| CN101145697A (en) | Accumulator multi-unit synchronous charging/discharging device and its method | |
| CN209448659U (en) | A kind of more DC port inverters | |
| CN105811453A (en) | Distributed energy intelligent access system and access method thereof | |
| CN102255332A (en) | On-grid inverter | |
| CN107147145A (en) | A kind of wind storage bipolarity direct-current grid and control method based on three level DC DC converters | |
| WO2020169018A1 (en) | Converter having multiple dc ports and control method | |
| CN103580048A (en) | Chained battery energy storage system integrated with active power filter | |
| CN109149554A (en) | Flywheel energy storage two stage power transformation system and control method | |
| CN102005772A (en) | Network combination inversion system and control method thereof | |
| CN104868503B (en) | It is a kind of to test power supply and method with the wind power generating set of energy storage and fictitious load | |
| CN216819454U (en) | Energy storage power module and energy storage system | |
| CN2899271Y (en) | Power module controlling power supply of chain DC-to-AC converter | |
| CN212111631U (en) | Testing device for distributed energy consumption device of flexible direct current transmission system | |
| CN107769389B (en) | Battery energy storage system of isolation symmetrical series flyback circuit | |
| CN207827607U (en) | AC DC bi-directional conversion circuit and elevator automatic help operating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |