CN112564149A - Medium-voltage direct-hanging energy storage system and online redundancy control method thereof - Google Patents
Medium-voltage direct-hanging energy storage system and online redundancy control method thereof Download PDFInfo
- Publication number
- CN112564149A CN112564149A CN202011320533.XA CN202011320533A CN112564149A CN 112564149 A CN112564149 A CN 112564149A CN 202011320533 A CN202011320533 A CN 202011320533A CN 112564149 A CN112564149 A CN 112564149A
- Authority
- CN
- China
- Prior art keywords
- energy storage
- module
- switch
- hanging
- medium
- 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.)
- Withdrawn
Links
Images
Classifications
-
- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
Abstract
The invention relates to a medium-voltage direct-hanging energy storage system and an online redundancy control method thereof, wherein the system comprises a grid-connected switch G1, an alternating-current pre-charging resistor R, an alternating-current pre-charging bypass switch G2, an input three-phase reactor L and a cascade submodule unit; the sub-module unit comprises a bypass module, a power module and a battery cluster; when the system is connected to the grid, the pulse type of the used power module is blocked, and the system is in a grid-connected mode; when the alternating current side fails or the redundant operation capacity is exceeded, the system is in a failure mode, all power module pulses are blocked, and G1 is switched off; when a system fails in one of the units, the system enters a redundant mode of operation. The medium-voltage direct-hanging type energy storage system provided by the invention has high conversion efficiency and can meet the rapid development requirement of large-scale energy storage technology; meanwhile, the reliability of the direct-hanging energy storage system can be improved by inputting and cutting off the medium-voltage direct-hanging energy storage online redundancy module.
Description
Technical Field
The invention belongs to the technical field of energy storage control, and particularly relates to a medium-voltage direct-hanging energy storage system and an online redundancy control method thereof.
Background
At present, a great deal of research and demonstration are carried out on the aspects of stable operation such as energy storage stabilizing new energy power fluctuation, tracking planned output and the like, and the potential in the aspects of energy storage for self-starting of a new energy power station and improvement of transient operation risk defense capability of the new energy power station is not fully excavated; the body and grouping technology of the energy storage system are researched a lot, but the research on the high-efficiency energy conversion technology is insufficient, the energy storage system in the existing demonstration project is mainly connected into a medium-voltage power grid through a step-up transformer by collecting low-voltage power grids, the problems of multiple energy conversion links and low conversion efficiency exist, and the rapid development requirement of the large-scale energy storage technology cannot be met. The medium-voltage direct-hanging type energy storage system has obvious advantages in key technologies such as high efficiency, capacity utilization rate, battery safety and dynamic response, and the invention provides an online redundancy control method suitable for the medium-voltage direct-hanging type energy storage system.
Disclosure of Invention
The invention mainly solves the following problems: the reliability of the direct-hanging energy storage system is improved by inputting and cutting off the medium-voltage direct-hanging energy storage online redundant module.
The invention specifically comprises a medium-voltage direct-hanging energy storage system, which comprises a grid-connected switch G1, an alternating-current pre-charging resistor R, an alternating-current pre-charging bypass switch G2, an input three-phase reactor L and a cascade submodule unit; the sub-module unit comprises a bypass module, a power module and a battery cluster; the bypass module comprises a maintenance switch K5 and an IGBT power electronic fast switch S1; k4 is a contactor between the bypass module and the power module; k1 is a discharge circuit switch and a voltage-sharing circuit switch during charging; k3 is a dc and charging switch; k2 is a dc and charge bypass switch.
Further, the system sampling point comprises an alternating current voltage Uabc and an alternating current Iabc; the submodule unit collects direct current voltage Udc and direct current Idc.
Further, the system operation state comprises a grid-connected standby mode, a fault mode, a redundant grid-connected operation mode and a non-redundant grid-connected operation mode.
Further, when the system is connected to the grid, the pulse type of the used power module is blocked, and the system is in a grid-connected mode; when the alternating current side fails or the redundant operation capacity is exceeded, the system is in a failure mode, all power module pulses are blocked, and G1 is switched off; when a system fails in one of the units, the system enters a redundant mode of operation.
The invention also comprises an online redundancy control method of the medium-voltage direct-hanging energy storage system, which specifically comprises the following steps:
step (1): when the direct-hanging type energy storage normally operates, the K1, the K3 and the K5 are separated, the K2 and the K4 are closed, the S1 blocks the pulse of the bypass module, and the bypass module is in a breaking state;
step (2): when the power module or the battery cluster fails, blocking all power module pulses;
and (3): all power modules are blocked, and the currents of all phase currents CTa, CTb and CTc are reduced to 0;
and (4): sending a bypass module trigger pulse to conduct the bypass module; when the S1 module fails, the maintenance switch K5 may be closed;
and (5): a trip switch K4 for cutting off the electrical connection between the bypass module and the power module and the battery cluster;
and (6): the direct-hanging type energy storage operates according to a redundant operation mode, and the fault unit is in an online maintenance state.
Compared with the prior art, the invention has the following benefits:
the medium-voltage direct-hanging type energy storage system provided by the invention has high conversion efficiency and can meet the rapid development requirement of large-scale energy storage technology; meanwhile, the reliability of the direct-hanging energy storage system can be improved by inputting and cutting off the medium-voltage direct-hanging energy storage online redundancy module.
Drawings
FIG. 1 is a topological structure of a direct-hanging energy storage system according to the present invention;
FIG. 2 is an electrical diagram of a seed module unit of the direct-voltage hanging type energy storage system according to the present invention;
fig. 3 is an experimental waveform of the online redundancy control method of the direct-voltage hanging type energy storage system according to the invention.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention. Any product that is identical or similar to the present invention, whether made in accordance with the teachings of the present invention or made by combining the present invention with other features of the prior art, falls within the scope of the present invention.
The topological structure of the direct-hanging type energy storage system comprises a grid-connected switch G1, an alternating-current pre-charging resistor R, an alternating-current pre-charging bypass switch G2, an input three-phase reactor L and a cascade submodule unit, wherein the topological structure is shown in figure 1; the electrical diagram of the sub-module unit is shown in fig. 2, and the sub-module unit comprises a bypass module, a power module, a battery cluster and the like; the bypass unit comprises a maintenance switch K5 and an IGBT power electronic fast switch S1; k4 is a contactor between the bypass module and the power module; k1 is the switch of the discharging circuit and the switch of the voltage equalizing circuit during charging; k3 is a dc and charging switch; k2 is a dc and charge bypass switch.
The system sampling point comprises the following steps: alternating voltage Uabc, alternating current Iabc; the submodule unit collects direct current voltage Udc and direct current Idc. The system running state comprises a grid-connected standby mode, a fault mode, a redundant grid-connected running mode and a non-redundant grid-connected running mode. When the system is connected to the grid, the pulse type of the used power module is blocked, and the system is in a grid-connected mode; when the alternating current side fails or the redundant operation capacity is exceeded, the system is in a failure mode, all power module pulses are blocked, and G1 is switched off; when a system fails in one of the units, the system enters a redundant mode of operation.
The invention relates to an online redundancy control method of a medium-voltage direct-hanging energy storage system, which specifically comprises the following steps:
step 1: when the direct-hanging type energy storage normally operates, the K1, the K3 and the K5 are separated, the K2 and the K4 are closed, the S1 blocks the pulse of the bypass module, and the bypass module is in a breaking state;
step 2: when the power module or the battery cluster fails, blocking all power module pulses;
and step 3: all power modules are blocked, and the currents CTa, CTb and CTc are reduced to 0;
and 4, step 4: sending out a bypass module trigger pulse S1 to conduct the bypass module; when the S1 module fails, switch K5 may be closed;
and 5: a trip switch K4 for cutting off the electrical connection between the bypass module and the power module and the battery cluster;
step 6: the direct-hanging type energy storage operates according to a redundant operation mode, and the fault unit is in an online maintenance state.
As shown in fig. 3, when the system enters the experimental waveform of the redundancy mode, and a fault unit is removed, the system is connected to the grid again and is parallel after a switching process of 10ms, so that the reliability of the direct-hanging energy storage operation is improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides a medium-voltage direct-hanging energy storage system which characterized in that: the topological structure of the medium-voltage direct-hanging energy storage system comprises a grid-connected switch G1, an alternating-current pre-charging resistor R, an alternating-current pre-charging bypass switch G2, an input three-phase reactor L and a cascade submodule unit; the sub-module unit comprises a bypass module, a power module and a battery cluster; the bypass module comprises a maintenance switch K5 and an IGBT power electronic fast switch S1; k4 is a contactor between the bypass module and the power module; k1 is a discharge circuit switch and a voltage-sharing circuit switch during charging; k3 is a dc and charging switch; k2 is a dc and charge bypass switch.
2. The medium voltage direct hanging energy storage system according to claim 1, wherein: the system sampling point comprises an alternating voltage Uabc and an alternating current Iabc; the submodule unit collects direct current voltage Udc and direct current Idc.
3. The medium voltage direct hanging energy storage system according to claim 1, wherein: the system running state comprises a grid-connected standby mode, a fault mode, a redundant grid-connected running mode and a non-redundant grid-connected running mode.
4. The medium voltage direct hanging energy storage system according to claim 3, wherein: when the system is connected to the grid, the pulse type of the used power module is blocked, and the system is in a grid-connected mode; when the alternating current side fails or the redundant operation capacity is exceeded, the system is in a failure mode, all power module pulses are blocked, and G1 is switched off; when a system fails in one of the units, the system enters a redundant mode of operation.
5. The online redundancy control method of the medium-voltage direct-hanging energy storage system according to any one of claims 1 to 4, wherein the online redundancy control method specifically comprises the following steps:
step (1): when the direct-hanging type energy storage normally operates, the K1, the K3 and the K5 are separated, the K2 and the K4 are closed, the S1 blocks the pulse of the bypass module, and the bypass module is in a breaking state;
step (2): when the power module or the battery cluster fails, blocking all power module pulses;
and (3): all power modules are blocked, and the currents of all phase currents CTa, CTb and CTc are reduced to 0;
and (4): sending a bypass module trigger pulse to conduct the bypass module; when the S1 module fails, the maintenance switch K5 may be closed;
and (5): a trip switch K4 for cutting off the electrical connection between the bypass module and the power module and the battery cluster;
and (6): the direct-hanging type energy storage operates according to a redundant operation mode, and the fault unit is in an online maintenance state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011320533.XA CN112564149A (en) | 2020-11-23 | 2020-11-23 | Medium-voltage direct-hanging energy storage system and online redundancy control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011320533.XA CN112564149A (en) | 2020-11-23 | 2020-11-23 | Medium-voltage direct-hanging energy storage system and online redundancy control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112564149A true CN112564149A (en) | 2021-03-26 |
Family
ID=75044794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011320533.XA Withdrawn CN112564149A (en) | 2020-11-23 | 2020-11-23 | Medium-voltage direct-hanging energy storage system and online redundancy control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112564149A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114448228A (en) * | 2022-04-11 | 2022-05-06 | 南京力骏新能源储能研究院有限公司 | Redundancy control method and system of direct-hanging energy storage converter based on port voltage state discrimination |
| CN115528688A (en) * | 2022-11-28 | 2022-12-27 | 广州智光电气股份有限公司 | Energy storage battery unit fault bypass control method and device and electronic equipment |
| CN115864659A (en) * | 2023-02-27 | 2023-03-28 | 西安西电高压开关有限责任公司 | Energy router series power module fault redundancy control method and system |
| WO2023246169A1 (en) * | 2022-06-22 | 2023-12-28 | 上海勘测设计研究院有限公司 | Fault clearing method for alternating-current bus of energy storage power station |
-
2020
- 2020-11-23 CN CN202011320533.XA patent/CN112564149A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114448228A (en) * | 2022-04-11 | 2022-05-06 | 南京力骏新能源储能研究院有限公司 | Redundancy control method and system of direct-hanging energy storage converter based on port voltage state discrimination |
| WO2023246169A1 (en) * | 2022-06-22 | 2023-12-28 | 上海勘测设计研究院有限公司 | Fault clearing method for alternating-current bus of energy storage power station |
| CN115528688A (en) * | 2022-11-28 | 2022-12-27 | 广州智光电气股份有限公司 | Energy storage battery unit fault bypass control method and device and electronic equipment |
| CN115864659A (en) * | 2023-02-27 | 2023-03-28 | 西安西电高压开关有限责任公司 | Energy router series power module fault redundancy control method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112564149A (en) | Medium-voltage direct-hanging energy storage system and online redundancy control method thereof | |
| CN101345419A (en) | Series voltage quality regulator and fast investment and cutting method | |
| CN111541362B (en) | Switching control method and system for MMC redundancy sub-module | |
| CN202333830U (en) | Energy storage converter with storage battery for distributed power system | |
| CN110739839B (en) | Charging method for extra-high voltage flexible direct-current full-bridge half-bridge hybrid converter | |
| CN104362616A (en) | Direct-current short-circuit fault ride-through method of modular multilevel converter of full-bridge submodule | |
| CN104038052B (en) | Modularization multi-level converter voltage balance control method | |
| US10790738B1 (en) | Circuit and method for fault detection and reconfiguration in cascaded H-bridge multilevel converters | |
| CN203747661U (en) | Pre-charge device of wind power current transformer and wind power current transformer | |
| CN111030105A (en) | Low-voltage ride through method of photovoltaic power generation system based on three-phase cascade H bridge | |
| Zhao et al. | A fault-tolerant reconfiguration system based on pilot switch for grid-connected inverters | |
| CN214958763U (en) | Multi-cluster parallel energy storage system applied to high-voltage direct-current equipment | |
| CN106385043A (en) | Multiple parallel electric power peak-load shifting device having uninterrupted power source function | |
| CN112039044A (en) | Pure battery power ship power system and control method | |
| CN103248015B (en) | Rapid short-circuit protection system for direct current bus of energy storage converter | |
| CN102570499A (en) | Constant-speed constant-frequency wind turbine low-voltage riding-through device and control method | |
| CN205105110U (en) | Converter owner circuit topology structure of many power inputs | |
| CN111277002B (en) | Flexible excitation power unit parallel topology structure and control method thereof | |
| CN113541138A (en) | Fan switching method and device suitable for mode conversion of direct-current power transmission system | |
| CN103414187B (en) | High-frequency megawatt bidirectional converter | |
| CN108767841B (en) | Energy storage unit separated type converter and control method | |
| CN107623331B (en) | Method for constructing power impact simplified model under direct-current fault | |
| Mhiesan et al. | Novel circuit and method for fault reconfiguration in cascaded H-bridge multilevel inverters | |
| Aguirre et al. | An environmental friendly alternative for hydrogen production and electric energy generation | |
| CN110868055A (en) | Fault current limiter for DC/DC converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210326 |