CN110601199B - Multi-system input combined module type energy conversion device - Google Patents
Multi-system input combined module type energy conversion device Download PDFInfo
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- CN110601199B CN110601199B CN201910864251.7A CN201910864251A CN110601199B CN 110601199 B CN110601199 B CN 110601199B CN 201910864251 A CN201910864251 A CN 201910864251A CN 110601199 B CN110601199 B CN 110601199B
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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
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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Abstract
The invention relates to a multi-system input combined modular energy conversion device, which belongs to the technical field of power supplies and at least comprises: the input power gateways of different inverters are accessed through the electronic switches; the input power gateway comprises a plurality of power conversion modules, a plurality of maximum power point tracking modules and a plurality of electronic switches; the output side of the input power gateway is connected with a direct current bus and an alternating current bus; an energy storage module; the input power gateway is connected with the energy storage module through a direct current bus; an output power gateway; the output power gateway comprises a plurality of electronic switches, a power conversion module and a plurality of electronic switches; an input interface and an output interface; wherein: the energy storage module is connected with the output power gateway through a direct current bus; the input power gateway is connected with the alternating current output interface through a power supply conversion module of the direct current bus and the output power gateway in sequence; the input power gateway is connected with the output interface through an alternating current bus.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a multi-system input combined modular energy conversion device.
Background
The energy problem is a key problem restricting the development of social economy, the distributed power generation provides a feasible scheme, and the energy routing is a key technology of the intellectualization of the future distributed power supply network, and has revolutionary profound influence on the consumption of renewable energy and the optimized use of distributed energy. The energy routing concept has different emphasis points from the perspective of energy internet, electric power system and electric power user, and generally, the energy conversion device is a concrete embodiment of an energy router in the energy internet in the electric power system and is also a core and a link of the energy router. Under the background of renewable energy distributed power generation and novel load diversity development, the energy conversion device integrates a power electronic conversion device, a control technology and a communication technology, and presents diversified development situations according to different requirements of pressure-bearing through flow, electrical isolation, new energy access, power grid interconnection and the like, the common requirement is that the energy conversion device has good compatibility and expandability, and the control strategy takes stability and flexibility into consideration.
The traditional energy conversion device is characterized in that energy sources of different systems are connected into a fixed inversion module and converted into a single direct current bus, an integral energy storage device is used for storing energy, and the energy sources are inverted in different grades and systems to obtain outputs of different voltages and different systems. When the inverter at the input end or the output end has a problem, the energy input device at the input end cannot supply power to the system or output voltage of the output end is abnormal, and when the direct current bus fails or the energy storage module has a problem, the whole system is paralyzed.
Disclosure of Invention
The invention provides a multi-system input combined module type energy conversion device for solving the technical problems in the prior art, and solves the problem of combined power supply of various types of energy in a distributed power generation system.
The invention aims to provide a multi-system input combined modular energy conversion device, which at least comprises: the energy storage device comprises an input power gateway, an energy storage module, an output power gateway, an input interface and an output interface;
the input power gateway comprises a plurality of first power conversion modules, a plurality of maximum power point tracking modules, a plurality of first electronic switches and a plurality of second electronic switches;
the energy storage module comprises a plurality of independent energy storage battery packs;
the output power gateway comprises a plurality of third electronic switches and a plurality of second power conversion modules;
the output interface comprises a plurality of direct current output interfaces and a plurality of alternating current output interfaces;
one path of the output side of the input power gateway is connected with an alternating current bus, and the other path of the output side of the input power gateway is connected with a direct current bus; one end of the first power conversion module and one end of the maximum power point tracking module are connected with the input interface through the first electronic switch, and the other end of the first power conversion module and the other end of the maximum power point tracking module are connected with the direct current bus through the second electronic switch;
one end of the energy storage module is connected with a direct current bus, and the other end of the energy storage module is connected with the direct current output interface through the plurality of third electronic switches; one end of the second power supply conversion module is connected with the direct current bus, and the other end of the second power supply conversion module is connected with the alternating current output interface;
the input power gateway also comprises a monitoring unit, wherein the monitoring unit judges the mode of an input electric energy source according to an input state, further controls the turn-off of a corresponding first electronic switch according to the mode of the electric energy source, connects an input interface into a corresponding first power conversion module or a maximum power point tracking module, and regulates the input power of an input end according to the system requirement;
when any input interface has a fault and stops supplying power, the input power gateway isolates the input interface and coordinates with other input interfaces.
Further, the direct current bus is constant voltage, and the alternating current bus is fixed frequency.
The invention has the advantages and positive effects that:
1. the intelligent input power gateway is utilized to realize the uniform conversion and intelligent management of electric energy sources of different systems, AC/DC power supply can be carried out, and comprehensive utilization and allocation of energy sources can be carried out, so that the aim of optimal use is achieved;
2. a multi-bus structure is provided, and buses of an alternating current bus and a direct current bus are adopted in the device, so that the transmission efficiency and reliability of the device are improved.
3. The modular energy storage and output power gateway jointly regulates and controls the output of the alternating current and direct current port, so that the output voltage and power can be controlled independently. The intelligent power gateway and the multi-bus are applied to the multi-system input combined modular energy conversion device, so that on one hand, the uniform system conversion and the autonomous controllable output port of various energy sources are realized, and on the other hand, the transmission efficiency and the transmission stability are ensured.
Drawings
FIG. 1 is a block diagram of a preferred embodiment of the present invention;
FIG. 2 is a block diagram of an input power gateway in a preferred embodiment of the present invention;
Detailed Description
For a further understanding of the invention, its nature and utility, reference should be made to the following examples, taken in conjunction with the accompanying drawings, in which:
referring to fig. 1 to 2, an intelligent power gateway is divided into an input power gateway and an output power gateway.
The input power gateway module controls the energy input of the whole system, comprises a plurality of MPPT (maximum power point tracking), DC/DC (direct current/direct current) and AC/DC (alternating current/direct current) modules, can perform unified conversion and intelligent management on electric energy sources of different systems, and accesses the energy sources of a fan, a photovoltaic cell, a fuel cell, a diesel engine, a micro-gas turbine and other equipment into a multi-system input combined modular energy conversion device through standardized input ports to realize the grade conversion, the electrical isolation and the energy transfer of voltage, each energy interface is provided with a monitoring unit such as a data monitoring unit, a load electric energy meter and the like, can upload the data of an electric energy source input port, the intelligent input power gateway collects the information of all the modules and the electric energy source equipment to finish the interaction and the data processing of the information among the nodes, adjusts or shuts off the energy input of the energy node by combining the state of each electric energy source input interface of the current time node of the system and a control target given by the total system, and when any input interface is input When a fault occurs and energy supply is stopped, the intelligent input power gateway can isolate the intelligent input power gateway, normal operation of a power grid can be still ensured through coordination work of other input nodes, and reliability of the system is improved. Compared with the traditional one-to-one mode, the intelligent input power gateway adopts a multi-to-multi mode, and any energy can be switched to different MPPT, DC/DC or AC/DC modules instead of the traditional fixed module. Each module is provided with an independent electronic switch, the multiple modules work in a combined mode, and when any module has a problem, the intelligent input power gateway can switch the energy input connected with the module with the problem to other normal modules to continue to operate in real time, so that the disturbance of the system is reduced to the minimum. The intelligent power gateway is provided with a plurality of plug-in energy input nodes, so that access and equipment maintenance of various different energy sources are facilitated, and each expansion input node uploads information to a system network for re-optimization settlement after being accessed into the network, so that optimal selection of power grid energy sources is realized.
Preferably, the method comprises the following steps: the design of many generating lines can guarantee system commonality and high efficiency under different typical operating mode and application scene, and its effect is as follows: (1) the requirement of multi-energy output is considered, the direct current input unit is connected to the direct current bus, the alternating current input unit is connected to the alternating current bus, and the availability, the universality and the efficiency of the system are guaranteed. (2) The inverter has the advantages that requirements of different working conditions are met, for example, the photovoltaic power supply, the wind power supply and the like have strong degeneration, the new energy is greatly influenced by weather, the voltage and power fluctuation range is wide, the output voltage of the inverter can be uniformly converted into direct current in a low-energy supply state, and stable alternating current power supplies such as a diesel engine and a micro-combustion engine can be directly conveyed to an alternating current bus. (3) The system has certain redundancy, and when one bus fails, the system can still have the function of outputting alternating current/direct current.
The intelligent energy storage device is replaced by the intelligent energy storage module consisting of the plurality of DC modules and the energy storage battery, the intelligent output power gateway can integrate the plurality of intelligent energy storage modules according to the output requirement and the control rule, and the required power and voltage are output through certain series-parallel connection reconstruction. The monitoring component of the intelligent output gateway can send the operating parameters, the integration rules, the output data of the AC/DC bus and the abnormal reports of each intelligent energy storage module to the control platform in real time, and the control platform makes reactions and regulation according to the receiving results. The intelligent output gateway effectively avoids the problem that the performance of the whole system is influenced by the abnormity of individual components in the traditional model, and real-time serial/parallel reconstruction is carried out according to the instruction of the system network, so that the system can still isolate a fault unit through system reconstruction under the condition that a single sub-module has a problem, the stable operation of the system is ensured, and the reliability of the system is improved. Meanwhile, due to the high modularization characteristic, the output of the integrated bus can be increased or decreased according to different occasions and application requirements, so that the bus can be more flexibly and widely applied.
The invention adopts an intelligent input gateway technology, an input interface can be connected with different inverters through an electronic switch, the unified system management conversion of various energy sources is realized, and buses of alternating current and direct current are output.
Specifically, as shown in fig. 1, the intelligent input gateway is composed of multiple sets of AC/DC, DC/DC, MPPT and electronic switches. When the energy is connected to the input interface, the adaptive control platform detects the input control system, controls the electronic switch to connect the electric energy to the corresponding inverter assembly through the distributed nodes, and adjusts the input power of the input end according to the system requirement.
As shown in fig. 2, the intelligent input gateway monitoring unit monitors the input of the electric energy source of the input interface, and inputs of different systems are connected to different inverter modules. And outputting an alternating current bus and a direct current bus.
2. Examples of the embodiments
When a 100kW fan, a 100kW photovoltaic cell and a 50kW diesel engine are connected into the multi-system input combination modular energy conversion device, the fan is assumed to be connected into an input interface 1, the photovoltaic cell is assumed to be connected into an input interface 2, the diesel engine is assumed to be connected into an input interface 3, the modular energy comprises 5 modules, and each module is 50V. The intelligent input gateway accesses the input interface 1 to the MPPT module, accesses the input interface 2 to the AC/DC module and accesses the input interface 3 to the AC/DC module and the AC bus according to the detected input state. The direct current bus is connected into a three-port inverter of the combined modular power supply, and after inversion, the direct current bus is output to the intelligent output gateway, and the other side controls charging and discharging of the modular energy. Meanwhile, the direct current bus is merged into the alternating current bus through DC/AC conversion to provide alternating current output. When the load end requires 200kW and 200V direct current output, the system can charge the modular energy, and the output intelligent gateway can output 4 energy modules in series to meet the requirement.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (2)
1. A multi-system input combined modular energy conversion device is characterized by at least comprising: the energy storage device comprises an input power gateway, an energy storage module, an output power gateway, an input interface and an output interface;
the input power gateway comprises a plurality of first power conversion modules, a plurality of maximum power point tracking modules, a plurality of first electronic switches and a plurality of second electronic switches;
the energy storage module comprises a plurality of independent energy storage battery packs;
the output power gateway comprises a plurality of third electronic switches and a plurality of second power conversion modules;
the output interface comprises a plurality of direct current output interfaces and a plurality of alternating current output interfaces;
one path of the output side of the input power gateway is connected with an alternating current bus, and the other path of the output side of the input power gateway is connected with a direct current bus; one end of the first power conversion module and one end of the maximum power point tracking module are connected with the input interface through the first electronic switch, and the other end of the first power conversion module and the other end of the maximum power point tracking module are connected with the direct current bus through the second electronic switch;
one end of the energy storage module is connected with a direct current bus, and the other end of the energy storage module is connected with the direct current output interface through the plurality of third electronic switches; one end of the second power supply conversion module is connected with the direct current bus, and the other end of the second power supply conversion module is connected with the alternating current output interface;
the input power gateway also comprises a monitoring unit, wherein the monitoring unit judges the mode of an input electric energy source according to an input state, further controls the turn-off of a corresponding first electronic switch according to the mode of the electric energy source, connects an input interface into a corresponding first power conversion module or a maximum power point tracking module, and regulates the input power of an input end according to the system requirement;
when any input interface has a fault and stops supplying power, the input power gateway isolates the input interface and coordinates with other input interfaces.
2. The multi-system input combined modular energy conversion device according to claim 1, wherein the dc bus is constant voltage and the ac bus is constant frequency.
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| EP3896817A4 (en) * | 2020-02-19 | 2022-02-23 | Huawei Digital Power Technologies Co., Ltd. | Power conversion device, and power supply system |
| CN111884242A (en) * | 2020-07-23 | 2020-11-03 | 天津大学 | Multi-bus network topological structure of distributed electric energy system |
| CN112117752A (en) * | 2020-08-28 | 2020-12-22 | 中国电子科技集团公司第十八研究所 | Distributed power supply multi-bus network topology system |
| CN112234691A (en) * | 2020-10-28 | 2021-01-15 | 深圳市赛德电源技术有限公司 | DCDC converter with integrated bin control function for power conversion cabinet |
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| CN103595071A (en) * | 2013-11-21 | 2014-02-19 | 国网上海市电力公司 | Energy system of micro-grid |
| CN104505848A (en) * | 2014-12-18 | 2015-04-08 | 北京四方继保自动化股份有限公司 | Energy storage power supply device on basis of distributed energy AC (Alternating Current) and DC (Direct Current) hybrid access |
| CN105811453A (en) * | 2016-03-14 | 2016-07-27 | 贵州电网有限责任公司电力科学研究院 | Distributed energy intelligent access system and access method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103595071A (en) * | 2013-11-21 | 2014-02-19 | 国网上海市电力公司 | Energy system of micro-grid |
| CN104505848A (en) * | 2014-12-18 | 2015-04-08 | 北京四方继保自动化股份有限公司 | Energy storage power supply device on basis of distributed energy AC (Alternating Current) and DC (Direct Current) hybrid access |
| CN105811453A (en) * | 2016-03-14 | 2016-07-27 | 贵州电网有限责任公司电力科学研究院 | Distributed energy intelligent access system and access method thereof |
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