CN111193253A - Direct-current micro-grid system of hydrogen energy fuel cell and control method - Google Patents
Direct-current micro-grid system of hydrogen energy fuel cell and control method Download PDFInfo
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- CN111193253A CN111193253A CN202010185294.5A CN202010185294A CN111193253A CN 111193253 A CN111193253 A CN 111193253A CN 202010185294 A CN202010185294 A CN 202010185294A CN 111193253 A CN111193253 A CN 111193253A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000000446 fuel Substances 0.000 title claims abstract description 40
- 239000001257 hydrogen Substances 0.000 title claims abstract description 37
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000010248 power generation Methods 0.000 claims abstract description 34
- 238000004146 energy storage Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/06—Two-wire systems
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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Abstract
The invention relates to the technical field of micro-grids, in particular to a hydrogen energy fuel cell direct current micro-grid system and a control method, wherein the hydrogen energy fuel cell direct current micro-grid system comprises a power grid, a medium-high voltage direct current circuit, a first direct current shunt circuit connected with the medium-high voltage direct current circuit, a low-voltage direct current module connected with the first direct current shunt circuit, and a distributed power generation system connected with the first direct current shunt circuit, wherein the distributed power generation system comprises a hydrogen energy fuel cell power generation module and an energy storage module; an energy information control system. The micro-grid system is provided with the energy information control system, all the components are in communication connection with the energy information control system, the energy information control system collects operation data of all the components through the energy data module, the supply and demand power balance of the whole system is calculated by using an algorithm according to the collected operation data, and meanwhile, the two high-voltage direct-current buses are arranged, so that the anti-interference capacity of the micro-grid system is enhanced, and the power supply system is prevented from being broken down when power failure, voltage flicker or voltage drop occurs.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to a direct-current micro-grid system of a hydrogen energy fuel cell and a control method.
Background
The Micro-Grid (Micro-Grid) is also translated into a Micro-Grid, which refers to a small power generation and distribution system composed of a distributed power supply, an energy storage device, an energy conversion device, a load, a monitoring and protecting device and the like. For a long time, research and development of related technologies of direct current micro-grids have been receiving wide attention from all circles. Communication companies in countries such as Sweden, Japan, France and the United states have started research and introduction of 300-400V data center direct current power distribution in the 90 s of the 20 th century. In addition, direct-current regional power distribution of warships, aviation and automatic systems, especially the electric traction direct-current power supply technology is mature, and a good opportunity is provided for popularization and application of the direct-current micro-grid. At present, in terms of house dc power supply, european union, japan and the united states have started research and demonstration works in relevant respects. China is still in a starting stage in the research aspect of the direct-current micro-grid, and with increasing importance of governments on new energy development and popularization and application of more and more direct-current household appliance technologies, the direct-current micro-grid has a wide development space.
However, the development of the dc microgrid still has many technical problems to be solved, such as limited working capacity and weak disturbance resistance of the dc microgrid system. When the direct-current micro-grid works, transient change processes such as sudden change of output power of a distributed unit, instant access or drop of a large-area load, switching from grid connection to isolated grid or from isolated grid to grid connection and the like may occur, and transient events can cause transient rise or fall of direct-current bus voltage, which are called voltage flicker and voltage drop. The occurrence of voltage flicker and voltage drop not only brings disadvantages to the normal operation of the electronic equipment, but also possibly causes malfunction of the control system, and finally causes the breakdown of the whole direct current microgrid system.
Disclosure of Invention
In order to solve the above problems, the present invention provides a hydrogen energy fuel cell dc microgrid system and a control method based on the hydrogen energy fuel cell dc microgrid system.
The invention is realized by adopting the following scheme:
the utility model provides a hydrogen energy fuel cell direct current microgrid system, includes the electric wire netting, and hydrogen energy fuel cell direct current microgrid system still includes: the medium and high voltage direct current line is connected with a power grid; the first direct current shunt circuit is connected with the medium-high voltage direct current line and is also connected with at least one medium-high voltage load; the low-voltage direct-current module is connected with the first direct-current path; the distributed power generation system is connected with the first direct current branch and comprises a hydrogen energy fuel cell power generation module and an energy storage module; the energy information control system is in communication connection with the first direct current shunt circuit, the distributed power generation system and the high-voltage load in the low-voltage direct current module; the medium-high voltage direct current line comprises a first medium-high voltage direct current bus and a second medium-high voltage direct current bus, and a direct current breaker is connected between the first medium-high voltage direct current bus and the second medium-high voltage direct current bus.
Furthermore, the low-voltage direct-current module comprises a low-voltage direct-current bus connected with the first direct-current branch, a second direct-current branch connected with the low-voltage direct-current bus, and at least one low-voltage load connected with the second direct-current branch, and the second direct-current branch and the low-voltage load are both in communication connection with the energy information control system.
Furthermore, the first direct current branch and the second medium-high voltage direct current bus are connected with a power grid through an AC/DC converter, and the AC/DC converter is in communication connection with an energy information control system.
Furthermore, the hydrogen energy fuel power generation module, the energy storage module, the middle-high voltage load, the low voltage load and the AC/DC converter are all provided with energy information data modules for collecting energy information.
Furthermore, the first direct current is connected with a low-voltage direct current bus through a DC/DC converter, and the DC/DC converter is provided with an energy information data module for acquiring energy information.
Furthermore, the load rated power of the low-voltage load is less than or equal to 500W, and the load power of the medium-high voltage load is more than 500W.
Furthermore, the energy information monitoring system is also connected with a remote monitoring end.
Furthermore, the hydrogen energy fuel cell power generation module is also connected with a hydrogen gas supply unit.
Further, the distributed power generation module further comprises a photovoltaic power generation system.
A control method is characterized in that the hydrogen energy fuel cell direct-current micro-grid system is applied, the energy information control system utilizes an energy information data module to acquire a voltage value U of a medium-high voltage direct-current line and operation data of an energy storage module, a medium-high voltage load and a low-voltage load in real time, a load working mode of the direct-current micro-grid system is divided into an operation area, an isolation area, a control area and a protection area, the acquired voltage value U and a voltage rated value U of the medium-high voltage direct-current line are divided into the operation areaNAnd comparing and judging, determining a mode area where the direct-current microgrid system is located, and regulating the operation of the system by combining the operation data.
Further, the determining the mode area where the direct-current microgrid system is located includes the following steps:
when 93% UN≤U≤105%UNIf the load is in the operation area, the medium-high voltage load and the low-voltage load can be started to operate at will;
when 90% of U is presentN≤U＜93%UNIf the load is in the isolation area, the medium-high voltage load and the low-voltage load are both kept in the current running state, and only the load can be stopped, and a new load cannot be started;
when 80% UN≤U＜90%UNIf the load is in the control area, the medium-high voltage load and the low-voltage load are both operated in a derating mode;
when 80% UNGreater than U or U < 105% UNAnd then the system is in a protection area, and all loads are protected and shut down.
Further, the control area is divided into a plurality of derating modes, including:
first order derating, 87.5% UN≤U＜90%UNReducing the middle and high voltage load, and operating in a low power consumption mode;
second-level derating: 85% UN≤U＜87.5%UNStopping the medium-high voltage load, and derating the rest loads;
third-level derating: 82.5% UN≤U＜85%UNThe medium-high voltage load is completely shut down, and only the low-voltage load is allowed to normally run;
four-stage derating: 80% UN≤U＜82.5%UNAnd all the medium and high voltage loads are stopped, and only the low voltage load is allowed to operate in a de-rated mode.
Further, the operation data comprises equipment information, control data, state data and energy data; the energy data comprises voltage, current, active power and reactive power.
Compared with the prior art, the invention has the following beneficial effects:
1. the micro-grid system is provided with the energy information control system, all the components are in communication connection with the energy information control system, the energy information control system collects the operation data of all the components through the energy data module, and calculates the supply and demand power balance of the whole system by using an algorithm according to the collected operation data, so that the anti-interference capability of the micro-grid system is enhanced, and the power supply system is prevented from being broken down when power failure, voltage flicker or voltage drop occurs.
2. The high-voltage direct current circuit is provided with two high-voltage direct current buses, the two high-voltage direct current buses are connected through the direct current circuit breaker, when any one of the medium-voltage and high-voltage buses fails, the direct current circuit breaker can be quickly disconnected, only one bus without the fault is used, and the breakdown of the direct current micro-grid system is further avoided.
3. The invention uses hydrogen energy fuel cells to generate electricity and photovoltaic electricity, and ensures that the direct current micro-grid system runs stably, efficiently and greenly for a long time.
4. The direct current bus of two kinds of voltage grades of medium-high pressure, low pressure are configured, and the system is mated with direct current electrical apparatus and is regarded as domestic appliance commonly used, reduces system energy and changes, improves the electric energy quality.
Drawings
Fig. 1 is a schematic diagram of a direct-current microgrid system of a hydrogen energy fuel cell provided by the invention.
FIG. 2 is a control flow chart of the present invention.
Detailed Description
To facilitate an understanding of the present invention for those skilled in the art, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
Referring to fig. 1 and fig. 2, the hydrogen energy fuel cell direct current microgrid system provided by the invention comprises a power grid, and the hydrogen energy fuel cell direct current microgrid system further comprises: the medium and high voltage direct current line is connected with a power grid; the first direct current shunt circuit is connected with the medium-high voltage direct current line and is also connected with at least one medium-high voltage load; the low-voltage direct-current module is connected with the first direct-current path; the distributed power generation system is connected with the first direct current path and comprises a hydrogen energy fuel cell power generation module, an energy storage module and a photovoltaic power generation system; and the energy information control system is in communication connection with the high-voltage load in the first direct current shunt circuit, the distributed power generation system and the low-voltage direct current module. In specific implementation, the power generation system is not limited to a hydrogen energy fuel cell power generation module, and other power generation modules such as wind power and hydroelectric power can be adopted.
The medium-high voltage direct current line comprises a first medium-high voltage direct current bus and a second medium-high voltage direct current bus, and a direct current breaker is connected between the first medium-high voltage direct current bus and the second medium-high voltage direct current bus. Two middle and high voltage direct current buses are connected through a direct current breaker to form a redundancy design, when the system works normally, the two middle and high voltage direct current buses are used (the direct current breaker is closed), when any one middle and high voltage direct current bus breaks down, the direct current breaker is disconnected, only the one which does not break down is used, and the system is prevented from being crashed comprehensively.
The low-voltage direct-current module comprises a low-voltage direct-current bus connected with the first direct-current branch, a second direct-current branch connected with the low-voltage direct-current bus, and at least one low-voltage load connected with the second direct-current branch, and the second direct-current branch and the low-voltage load are in communication connection with the energy information control system. The energy information control system can control the on-off of different branches of the first direct current branch and the second direct current branch.
The first direct current branch and the second medium-high voltage direct current bus are connected with a power grid through an AC/DC converter, and the AC/DC converter is in communication connection with an energy information control system. The hydrogen energy fuel power generation module, the energy storage module, the middle-high voltage load, the low voltage load and the AC/DC converter are all provided with energy information data modules for acquiring energy information. The first direct current branch is connected with the low-voltage direct current bus through the DC/DC converter, and the DC/DC converter is provided with an energy information data module for acquiring energy information. The energy information data module can collect the operation data of each device, such as: the system is operated in an optimal state, firstly, equipment information needs to be acquired through an energy data module, and whether the equipment is load or energy supply equipment is distinguished; the operation states of all equipment can be judged by collecting state data (for loads, the operation states comprise opening, closing and standby, for energy storage modules, the operation states comprise charging, discharging and non-charging and non-discharging, for fuel cell modules, power generation and non-power generation), then an energy data module collects voltage, current, active power and reactive power information of all the equipment, and the operation states (the generated energy is adjusted) of a power grid, a hydrogen energy fuel cell power generation module, a photovoltaic power generation module and an energy storage module are adjusted in real time by calculating the power consumption of the loads in real time through an algorithm, so that the energy of a system is balanced in supply and demand, and optimal operation is realized. The energy information data module is connected to each component, and is integrated with each component by default, so that it is not shown in the figure.
The load rated power of the low-voltage load is less than or equal to 500W, and the load power of the medium-high voltage load is more than 500W. For example, the medium-high voltage load may be an electric cooker, a hot water kettle, an air energy water heater, an air conditioner external unit, a charging pile and the like, and the low-voltage load may be an air conditioner internal unit, an air purifier, a refrigerator, an electric fan and the like.
The energy information monitoring system is also connected with a remote monitoring end. The remote monitoring terminal can adopt an intelligent portable terminal such as an electronic computer or a mobile phone, and is convenient for workers to monitor the running state of the system in real time.
The hydrogen energy fuel cell power generation module is also connected with a hydrogen gas supply unit. The hydrogen energy fuel cell power generation module can provide clean, efficient, continuous and stable energy supply, when the power grid is broken down, the hydrogen energy fuel cell can continuously supply power and generate power through the hydrogen gas supply unit, and long-time, stable, efficient and green operation of the system is maintained.
In this embodiment, each component communicatively connected to the energy information control system may be connected to the energy information control system via a communication bus.
The invention also provides a control method, which applies the hydrogen energy fuel cell direct current micro-grid system, the energy information control system utilizes the energy information data module to acquire the voltage value U of the medium-high voltage direct current line and the operation data of the energy storage module, the medium-high voltage load and the low-voltage load in real time, the load working mode of the direct current micro-grid system is divided into an operation area, an isolation area, a control area and a protection area, and the acquired voltage value U and the voltage rated value U of the medium-high voltage direct current line are divided into the operation area, the isolation area, the controlNAnd comparing and judging, determining a mode area where the direct-current microgrid system is located, and regulating the operation of the system by combining the operation data.
The method for determining the mode area of the direct-current microgrid system comprises the following steps:
when 93% UN≤U≤105%UNIf the load is in the operation area, the medium-high voltage load and the low-voltage load can be started to operate at will;
when 90% of U is presentN≤U＜93%UNIf the load is in the isolation area, the medium-high voltage load and the low-voltage load are both kept in the current running state, and only the load can be stopped, and a new load cannot be started;
when 80% UN≤U＜90%UNIf the load is in the control area, the medium-high voltage load and the low-voltage load are both operated in a derating mode;
when 80% UNGreater than U or U < 105% UNAnd then the system is in a protection area, and all loads are protected and shut down.
The control area is divided into a multi-stage derating mode and comprises the following steps:
first order derating, 87.5% UN≤U＜90%UNReducing the middle and high voltage load, and operating in a low power consumption mode;
second-level derating: 85% UN≤U＜87.5%UNStopping the medium-high voltage load, and derating the rest loads;
third-level derating: 82.5% UN≤U＜85%UNThe medium-high voltage load is completely shut down, and only the low-voltage load is allowed to normally run;
four-stage derating: 80% UN≤U＜82.5%UNAnd all the medium and high voltage loads are stopped, and only the low voltage load is allowed to operate in a de-rated mode.
The operation data comprises equipment information, control data, state data and energy data; the energy data comprises voltage, current, active power and reactive power.
The four control areas are only one part of an automatic algorithm, the system runs in an optimal state, and the energy data module is also required to be combined to acquire equipment information to distinguish whether the equipment is load equipment or energy supply equipment; the operation states of all equipment can be judged by collecting state data (for loads, the operation states comprise opening, closing and standby, for energy storage modules, the operation states comprise charging, discharging and non-charging and non-discharging, for fuel cell modules, power generation and non-power generation), then an energy data module collects voltage, current, active power and reactive power information of all the equipment, and the operation states (the generated energy is adjusted) of a power grid, a hydrogen energy fuel cell power generation module, a photovoltaic power generation module and an energy storage module are adjusted in real time by calculating the power consumption of the loads in real time through an algorithm, so that the energy of a system is balanced in supply and demand, and optimal operation is realized.
The direct current bus voltage response mechanism control (namely the control method) can well adjust the load operation mode, so that the direct current microgrid system reaches a constant power operation state, and bus voltage drop or voltage flash caused by supply side faults of the system is avoided. Meanwhile, the method realizes automatic power distribution of the microgrid, balance of supply and demand is achieved, optimal economic benefit is achieved, and reliability of the microgrid system is improved to a certain extent.
The micro-grid system is provided with the energy information control system, all the components are in communication connection with the energy information control system, the energy information control system collects the operation data of all the components through the energy data module, and calculates the supply and demand power balance of the whole system by using an algorithm according to the collected operation data, so that the anti-interference capability of the micro-grid system is enhanced, and the power supply system is prevented from being broken down when power failure, voltage flicker or voltage drop occurs. The high-voltage direct current circuit is provided with two high-voltage direct current buses, the two high-voltage direct current buses are connected through the direct current circuit breaker, when any one of the medium-voltage and high-voltage buses fails, the direct current circuit breaker can be quickly disconnected, only one bus without the fault is used, and the breakdown of the direct current micro-grid system is further avoided. The invention uses hydrogen energy fuel cells to generate electricity and photovoltaic electricity, and ensures that the direct-current micro-grid system runs stably, efficiently and greenly for a long time. The direct current bus of two kinds of voltage grades of medium-high pressure, low pressure are configured, and the system is mated with direct current electrical apparatus and is regarded as domestic appliance commonly used, reduces system energy and changes, improves the electric energy quality.
In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but are not intended to indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, e.g., as meaning permanently attached, removably attached, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the scope of the included claims.
Claims (13)
1. The utility model provides a hydrogen energy fuel cell direct current microgrid system, includes the electric wire netting, its characterized in that, hydrogen energy fuel cell direct current microgrid system still includes:
the medium and high voltage direct current line is connected with a power grid;
the first direct current shunt circuit is connected with the medium-high voltage direct current line and is also connected with at least one medium-high voltage load;
the low-voltage direct-current module is connected with the first direct-current path;
the distributed power generation system is connected with the first direct current branch and comprises a hydrogen energy fuel cell power generation module and an energy storage module;
the energy information control system is in communication connection with the first direct current shunt circuit, the distributed power generation system and the high-voltage load in the low-voltage direct current module;
the medium-high voltage direct current line comprises a first medium-high voltage direct current bus and a second medium-high voltage direct current bus, and a direct current breaker is connected between the first medium-high voltage direct current bus and the second medium-high voltage direct current bus.
2. The system according to claim 1, wherein the low-voltage dc module comprises a low-voltage dc bus connected to the first dc branch, a second dc branch connected to the low-voltage dc bus, and at least one low-voltage load connected to the second dc branch, and the second dc branch and the low-voltage load are both communicatively connected to the energy information control system.
3. The system according to claim 2, wherein the first DC branch and the second medium-high voltage DC bus are both connected to a power grid through an AC/DC converter, and the AC/DC converter is communicatively connected to the energy information control system.
4. The direct-current microgrid system of a hydrogen energy fuel cell according to claim 3, characterized in that the hydrogen energy fuel power generation module, the energy storage module, the medium-high voltage load, the low voltage load and the AC/DC converter are all provided with energy information data modules for collecting energy information.
5. The direct-current microgrid system of a hydrogen energy fuel cell according to claim 2, characterized in that the first direct-current circuit is connected with a low-voltage direct-current bus through a DC/DC converter, and the DC/DC converter is provided with an energy information data module for collecting energy information.
6. The system of claim 2, wherein the load power rating of the low-voltage load is less than or equal to 500W, and the load power rating of the medium-voltage load is greater than 500W.
7. The direct-current microgrid system of a hydrogen energy fuel cell according to claim 1, characterized in that the energy information monitoring system is further connected with a remote monitoring terminal.
8. The system of claim 1, wherein the hydrogen-powered fuel cell direct current microgrid system is further connected with a hydrogen gas supply unit.
9. The hydrogen fuel cell direct current microgrid system of claim 1, wherein said distributed generation modules further comprise a photovoltaic power generation system.
10. A control method is characterized in that the hydrogen energy fuel cell direct current microgrid system of any one of claims 1 to 9 is applied, the energy information control system utilizes an energy information data module to acquire the voltage value U of a medium-high voltage direct current line and the operation data of an energy storage module, a medium-high voltage load and a low-voltage load in real time, the load working mode of the direct current microgrid system is divided into an operation area, an isolation area, a control area and a protection area, and the acquired voltage value U and the voltage rated value U of the medium-high voltage direct current line areNAnd comparing and judging, determining a mode area where the direct-current microgrid system is located, and regulating the operation of the system by combining the operation data.
11. The control method according to claim 9, wherein the determining the mode area where the dc microgrid system is located comprises the steps of:
when 93% UN≤U≤105%UNIf the load is in the operation area, the medium-high voltage load and the low-voltage load can be started to operate at will;
when 90% of U is presentN≤U＜93%UNIf the load is in the isolation area, the medium-high voltage load and the low-voltage load are both kept in the current running state, and only the load can be stopped, and a new load cannot be started;
when 80% UN≤U＜90%UNIf the load is in the control area, the medium-high voltage load and the low-voltage load are both operated in a derating mode;
when 80% UNGreater than U or U < 105% UNAnd then the system is in a protection area, and all loads are protected and shut down.
12. The control method according to claim 10, wherein the control section is divided into a plurality of derating modes including:
first order derating, 87.5% UN≤U＜90%UNReducing the middle and high voltage load, and operating in a low power consumption mode;
second-level derating: 85% UN≤U＜87.5%UNStopping the medium-high voltage load, and derating the rest loads;
three-stageDerating: 82.5% UN≤U＜85%UNThe medium-high voltage load is completely shut down, and only the low-voltage load is allowed to normally run;
four-stage derating: 80% UN≤U＜82.5%UNAnd all the medium and high voltage loads are stopped, and only the low voltage load is allowed to operate in a de-rated mode.
13. The control method according to claim 10, wherein the operation data includes equipment information, control data, status data, energy data; the energy data comprises voltage, current, active power and reactive power.
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| CN202010185294.5A CN111193253A (en) | 2020-03-17 | 2020-03-17 | Direct-current micro-grid system of hydrogen energy fuel cell and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112383043A (en) * | 2020-11-02 | 2021-02-19 | 西安西电电力系统有限公司 | System for hydrogen fuel cell to access medium-voltage direct-current power distribution network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112383043A (en) * | 2020-11-02 | 2021-02-19 | 西安西电电力系统有限公司 | System for hydrogen fuel cell to access medium-voltage direct-current power distribution network |
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