CN103166303A - Power management device and method of operation thereof - Google Patents
Power management device and method of operation thereof Download PDFInfo
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- CN103166303A CN103166303A CN2011104091364A CN201110409136A CN103166303A CN 103166303 A CN103166303 A CN 103166303A CN 2011104091364 A CN2011104091364 A CN 2011104091364A CN 201110409136 A CN201110409136 A CN 201110409136A CN 103166303 A CN103166303 A CN 103166303A
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Abstract
本发明涉及一种电能管理装置及其操作方法。该电能管理装置包含一电能转换单元、一第一感测单元、一第二感测单元、一切换开关单元以及一控制单元。该电能转换单元转换至少一再生能源发电装置的输出电能。该第一感测单元检测一第一电流与一第一电压。该第二感测单元检测一第二电流与一第二电压。当该控制单元控制该切换开关单元为导通时，该控制单元根据该些电流与该些电压，以得到该至少一再生能源发电装置的输出电能以及得到回馈至该交流市电的电能。
The present invention relates to an electric energy management device and an operation method thereof. The electric energy management device comprises an electric energy conversion unit, a first sensing unit, a second sensing unit, a switching unit and a control unit. The electric energy conversion unit converts the output electric energy of at least one renewable energy power generation device. The first sensing unit detects a first current and a first voltage. The second sensing unit detects a second current and a second voltage. When the control unit controls the switching unit to be turned on, the control unit obtains the output electric energy of the at least one renewable energy power generation device and obtains the electric energy fed back to the AC mains according to the currents and the voltages.
Description
Technical field
The present invention relates to a kind of electric power management device and method of operation thereof, espespecially a kind of electric power management device of renewable source of energy generation and method of operation thereof.
Background technology
Along with the hot network of development and the economic activity of mankind's science and technology, the depletion rate of earth energy increases fast, the dim appearance of energy crisis.Based on the energy-conservation inevitable theory of the difficulty of increasing income, the approach that develops into a necessity of the renewable energy resources.In addition, for the use of the renewable energy resources, except self-centered use electric energy can be provided, the electric power of redundancy can also import the public power line of force, returned and sold to Utilities Electric Co..
Take solar photovoltaic system as example, be mainly to carry out opto-electronic conversion by solar panels to produce DC power supply, then convert DC power supply to AC power via electric governor and synchronize parallel running with civil power for the bus of load use or feed-in civil power.Therefore, with regard to function, the small distributed electricity generation system can be divided into following three types: (1) self (stand-alone system), (2) commercial power parallel type (grid-connection system) and (3) mixed type (hybrid system).Self solar photovoltaic system that system refers to is not connected running with other power supply, and the directly load that connects of feed system is so this system is more suitable for the place that remote districts or marine isolated island etc. do not have commercial power supply.All power sources of load are wind-force or solar energy, and solar energy can charge redundant energy except the load electricity consumption can be provided to storage battery (battery); When solar electric power moment is not enough to provide the load required electric power, provided by storage battery.Commercial power parallel type solar photovoltaic system that system refers to is in parallel with the Utilities Electric Co. network, as long as equal applicable this type systematic in any place that civil power electric power can normally be sent to.If the solar photovoltaic system energy output is greater than loading demand, can be with redundant power opposite tide feed-in civil power, anti-, when the not enough load of solar photovoltaic system energy output is used, the part that civil power can be under-supply.In addition, in response to the unsettled problem of power quality, and develop hybrid system.When solar photovoltaic system is stopped power supply in civil power, use by the collocation batteries, can be immediately and mains isolation, form the independent operation power supply, so that of short duration electric power to be provided.When powering to the city power recovery, solar photovoltaic system recovers and commercial power parallel, also batteries is charged simultaneously.
See also Fig. 1, be the block schematic diagram of the renewable energy generating system of prior art.As seen from Figure 1, it is to determine according to the renewable energy resources (or energy storage device) peak power output that such electricity generation system circuit framework exists system's energy output, and can't do power scheduling according to the load operating position, the difficulty of the system that so will increase electric power in scheduling even may jeopardize system dependability.In addition, such circuit framework will be in case when also existing the operation of electric power system abnormal, can't protect load.
Therefore; how to design a kind of electric power management device and method of operation thereof; by setting up the diverter switch unit; changeable renewable source of energy generation is the generation mode of commercial power parallel type or self; can coordinate in addition and set up voltage and current sensor; to detect voltage and the electric current in path; when making voltage on this path being detected or electric current abnormal; can being connected by isolation electric main and generating set of renewable energy resource and load; so that protection mechanism to be provided, it is a large problem that overcomes and solve for institute of the present invention wish row.
Summary of the invention
A purpose of the present invention is to provide a kind of electric power management device, to overcome the problem of prior art.
Therefore electric power management device of the present invention, be electrically connected with a regeneration energy source electric generating device and a load and form one first path, is electrically connected with an electric main and this load and forms one second path.This electric power management device comprises an electric energy converting unit, one first sensing cell, one second sensing cell, switching switch element and a control unit.
This electric energy converting unit is changed the output electric energy of this generating set of renewable energy resource, so that this electric main and this load to be provided.This first sensing cell is electrically connected on this first path, with detection flow through one first electric current and one first voltage in this first path.This second sensing cell is electrically connected on this second path, to detect one second electric current and the second voltage on this second path.This diverter switch unit is electrically connected on this second path.
Wherein, when this control unit is controlled this diverter switch unit and is conducting, this generating set of renewable energy resource and this electric main are electrically connected with parallel way, and this control unit is according to this first electric current and this first voltage, obtain the output electric energy of this generating set of renewable energy resource, also according to this second electric current and this second voltage, obtain being fed back to the electric energy of this electric main, and should export the difference of electric energy and this feedback electric energy, and provide this load required electric energy.
Another object of the present invention is to provide a kind of method of operation of electric power management device, to overcome the problem of prior art.
Therefore the method for operation of electric power management device of the present invention, this electric power management device is electrically connected with this load with a regeneration energy source electric generating device and forms one first path, and with an electric main and this load electric connection formation one second path.The step of this electric power management device method of operation comprises: the output electric energy that (a) provides an electric energy converting unit to change this generating set of renewable energy resource, to offer this electric main and this load; (b) provide one first sensing cell and one second sensing cell, with one first electric current and one first voltage that detects respectively this first path and one second electric current and a second voltage that detects this second path; (c) provide one to switch switch element and a control unit; (d) when this control unit is controlled this diverter switch unit and is conducting, this generating set of renewable energy resource and this electric main are electrically connected with parallel way, and this control unit is according to this first electric current and this first voltage, obtain the output electric energy of this generating set of renewable energy resource, and this control unit is according to this second electric current and this second voltage, obtain being fed back to the electric energy of this electric main, and should export the difference of electric energy and this feedback electric energy, provide this load required electric energy; And (e) when this control unit is controlled this diverter switch unit for cut-off, this generating set of renewable energy resource is separately to this load supplying.
Reach in order further to understand the present invention technology, means and the effect that predetermined purpose is taked, see also following about detailed description of the present invention and accompanying drawing, believe purpose of the present invention, feature and characteristics, when getting thus one deeply and concrete understanding, yet appended graphic reference and the explanation use of only providing is limited the present invention.
Description of drawings
Fig. 1 is the block schematic diagram of the renewable energy generating system of prior art;
Fig. 2 is the block schematic diagram of the renewable source of energy generation direction of energy of the present invention;
Fig. 3 is the first embodiment block schematic diagram of the present invention's one electric power management device;
Fig. 4 A is the block schematic diagram of diverter switch unit operations when conducting of this electric power management device of the present invention;
Fig. 4 B is the block schematic diagram of diverter switch unit operations when cut-off of this electric power management device of the present invention;
Fig. 5 is the second embodiment block schematic diagram of this electric power management device of the present invention;
Fig. 6 is the 3rd embodiment block schematic diagram of this electric power management device of the present invention; And
Fig. 7 is the flow chart of this electric power management device method of operation of the present invention.
Wherein, description of reference numerals is as follows:
10 generating set of renewable energy resource
20 electric mains
30 loads
40 electric power management devices
402 electric energy converting units
404 first sensing cells
406 diverter switch unit
408 control units
410 second sensing cells
501～50N external electric energy converting unit
60 energy storage devices
70 bidirectional power conversion unit
101～10N generating set of renewable energy resource
L1 the first path
I1 the first electric current
V1 the first voltage
L2 the second path
I2 the second electric current
The V2 second voltage
The Pi generating set of renewable energy resource produces electric energy
Pg electric main feed-in electric energy
Electric energy is used in the Po load
Pil～PiN generating set of renewable energy resource produces electric energy
P1 the first power
P2 the second power
P3 the 3rd power
S100～S500 step
Embodiment
Relevant the technical content and a detailed description coordinate graphic being described as follows:
See also Fig. 2, be the block schematic diagram of the renewable source of energy generation direction of energy of the present invention.Wherein, this generating set of renewable energy resource 10 can be a solar photovoltaic generating device, wind power generation plant or fuel-cell device ... etc., but not as limit.Fig. 2 mainly is explanation, and the power loss in taking into account system operating process not is prerequisite, supposes that the power that this generating set of renewable energy resource 10 produces is one first power P 1; The power of this electric main 20 of feed-in is one second power P 2; And the power that this load 30 receives is one the 3rd power P 3, wherein three's pass is: P1=P2+P3, therefore, P2=P1-P3, wherein, the direction of arrow represents the real power direction of the moment direction of energy, therefore, in formula, positive sign represents that the real power direction is identical with the direction of arrow, otherwise negative sign represents that the real power direction is opposite with the direction of arrow.
Therefore, with regard to this generating set of renewable energy resource 10 this first power P 1 that produces and these the second power P 2 magnitude relationship that this load receives, following discussion is arranged:
(1) when P3＞P1, P2=P1-P3 is negative value, and therefore, the real power direction of expression systematic electricity trend is supplied real power to this load 30 simultaneously for this generating set of renewable energy resource 10 and this electric main 20.That is, in the commercial power parallel system take the renewable energy resources as main power supply, if during this first power P 1 that the required power consumption of this load 30 produces greater than this generating set of renewable energy resource 10, the power consumption of these load 30 deficiencies, by these electric main 20 power supplies, to keep this load 30 normal runnings.
(2) when P3＜P1, P2=P1-P3 be on the occasion of, therefore, the real power direction of expression systematic electricity trend is supplied real power to this electric main 20 and this load 30 simultaneously for this generating set of renewable energy resource 10.That is, in the commercial power parallel system take the renewable energy resources as main power supply, if this first power P 1 that this generating set of renewable energy resource 10 produces during greater than the required power consumption of this load 30, offers the redundant power after this load 30, this electric main 20 of feed-in more.
As shown in Figure 2, the real power of the above-mentioned direction of energy is controlled by an electric power management device 40, as for the detailed operation of this electric power management device 40, further description will be arranged later.
See also Fig. 3, be the first embodiment block schematic diagram of the present invention's one electric power management device.As shown in the figure, this electric power management device 40 is electrically connected respectively regeneration energy source electric generating device 10, an electric main 20 and a load 30.This generating set of renewable energy resource 10 is electrically connected with this load 30 and forms one first path L1; This electric main 20 is electrically connected with this load 30 and forms one second path L2.This electric power management device 40 comprises an electric energy converting unit 402, one first sensing cell 404, one second sensing cell 410, switching switch element 406 and a control unit 408.
This electric energy converting unit 402 is electrically connected these generating set of renewable energy resource 10, is output as to change this generating set of renewable energy resource 10 output that exchanges that this electric main 20 and 30 of this loads can receive.That is to say, when this generating set of renewable energy resource 10 is the Blast Furnace Top Gas Recovery Turbine Unit (TRT) of a direct current power supply generating, when being for example a solar photovoltaic (solar photovoltaic) Blast Furnace Top Gas Recovery Turbine Unit (TRT) or a fuel cell (fuel cell) Blast Furnace Top Gas Recovery Turbine Unit (TRT), but not as limit, this electric energy converting unit 402 is a DC-AC converter (DC-to-ACconverter).Otherwise when this generating set of renewable energy resource 10 was the Blast Furnace Top Gas Recovery Turbine Unit (TRT) of an AC power generating, when for example being a wind power generation blower fan device, but not as limit, this electric energy converting unit 402 was an AC-AC transducer (AC-to-AC converter).
This first sensing cell 404 is electrically connected at this generating set of renewable energy resource 10 and is electrically connected on formed this first path L1, to detect one first electric current I 1 and the one first voltage V1 on the L1 of this first path with this load 30.This second sensing cell 410 is electrically connected at this electric main 20 and is electrically connected on formed this second path L2, to detect one second electric current I 2 and the second voltage V2 on the L2 of this second path with this load 30.Wherein, the transducer of this first sensing cell 404 with electric current and voltage sensing function; This second sensing cell 410 has the transducer of electric current and voltage sensing function.This diverter switch unit 406 is electrically connected at this electric main 20 and is electrically connected on formed this second path L2 with this load 30.This control unit 408 is electrically connected these electric energy converting units 402, this first sensing cell 404, this second sensing cell 410 and this diverter switch unit 406.
Cooperation is referring to Fig. 4 A, the block schematic diagram for the diverter switch unit operations of this electric power management device of the present invention when the conducting.when this control unit 408 is controlled this diverter switch unit 406 for conducting, this generating set of renewable energy resource 10 is for incorporating this electric main 20 operations into, that is, form the generating framework of commercial power parallel type (grid-connection system), this control unit 408 detects this first electric current I 1 and this first voltage V1 according to this first sensing cell 404, obtain the output electric energy of this generating set of renewable energy resource 10, that is, under the prerequisite of the power loss in taking into account system operating process not, the product (that is I1*V1) of detected this first electric current I 1 of this first sensing cell 404 and this first voltage V1, it is the output electric energy of this generating set of renewable energy resource 10.And, this control unit 408 detects this second electric current I 2 and this second voltage V2 according to this second sensing cell 410, obtain being fed back to the electric energy of this electric main 20, that is, under the prerequisite of the power loss in taking into account system operating process not, the product (that is I2*V2) of detected this second electric current I 2 of this second sensing cell 410 and this second voltage V2 is for being fed back to the electric energy of this electric main 20.Moreover the output electric energy of this generating set of renewable energy resource 10 and this are fed back to the electric energy difference of the electric energy of this electric main 20, the electric energy that uses for this load 30.
In addition, when this second sensing cell 410 detects this second voltage V2 abnormal on the L2 of this second path, this diverter switch of this control unit 408 cut-offs unit 406 is to isolate being connected of this electric main 20 and this generating set of renewable energy resource 10 and this load 30.So, by ending the operation of this diverter switch unit 406, so that protection mechanism to be provided; that is; when this electric main 20 abnormal operation, can by disconnecting the electric connection of 30 of electric main 20 and this loads, can obtain high-reliability and high-quality power supply to protect this load 30.
Be worth mentioning, in actual applications, can by this first sensing cell 404 and this second sensing cell 410 this first electric current I 1 and this first voltage V1 and this second electric current I 2 and this second voltage V2 detected respectively, the output electric energy of this generating set of renewable energy resource 10 that calculates and this are fed back to the electric energy of this electric main 20, and the intelligent power management further is provided.That is to say, due to the large young pathbreaker of output electric energy depending on the environmental aspect of this generating set of renewable energy resource 10.Take the solar photovoltaic Blast Furnace Top Gas Recovery Turbine Unit (TRT) as example, the output electric energy of this generating set of renewable energy resource 10 will be subjected to season round the clock, hours of daylight, intensity of sunshine ... etc. factor impact; If take the wind power generation blower fan device as example, the output electric energy of this generating set of renewable energy resource 10 will be subjected to season round the clock, wind speed ... etc. factor impact, in brief, the output electric energy of this generating set of renewable energy resource 10 can be considered earthquake constantly, also therefore, return cost and the power supplying efficiency consideration of sale of electricity power company at and redundancy electric energy self-sufficient based on the renewable energy resources, can use as much as possible the output electric energy of this generating set of renewable energy resource 10 is offered this load 30 totally, be to be better electric energy management strategy.Moreover client is used for the electric energy of this load 30, can utilize and shift the spike electricity consumption to using from peak time, except improving power supplying efficiency, more can significantly alleviate outside electricity charge burden.Therefore, can be by the electric energy that is fed back to this electric main 20 be controlled, and in response to the need for electricity of this load 30, reach the intelligent power management.
Cooperation is the block schematic diagram of diverter switch unit operations when ending of this electric power management device of the present invention referring to Fig. 4 B.When this control unit 408 is controlled this diverter switch unit 406 for cut-off, this generating set of renewable energy resource 10 is separately to these load 30 power supplies, that is, form the generating framework of self (stand-alonesystem), and provide this electric weight that load 30 is used by the electric energy that this generating set of renewable energy resource 10 produces, to reach self-centered supply of electric power.
Be worth mentioning, this first sensing cell 404 of above-mentioned this electric power management device 40 and the setting position of this second sensing cell 410, be not limited to the position that icon indicates, as long as can reach the electric energy of these load 30 uses of judgement and the current sense setting position of the electric energy that judgement is fed back to this electric main 20, all be contained in category of the present invention.
See also Fig. 5, be the second embodiment block schematic diagram of this electric power management device of the present invention.This second embodiment and this first embodiment maximum difference are that this second embodiment has a plurality of generating set of renewable energy resource 101～10N, to form the construction for electricity of many group input sources.Wherein, each this generating set of renewable energy resource 101～10N electric connection that is connected in parallel to each other, and each this generating set of renewable energy resource 101～10N more is connected in series external electric energy converting unit a 501～50N to electrotropism, then is electrically connected with this electric power management device 40; And, each this external electric energy converting unit 501～50N controls by this control unit 408, according to each this generating set of renewable energy resource 101～10N and this load 30 situations, provide different energy to control,, those generating set of renewable energy resource 101～10N can be electrically connected with parallel way turn round output that should generating set of renewable energy resource 101～10N with conversion institute.So, by the construction for electricity of many groups input source, can increase the margin of system power supply, can avoid because of single input source abnormal, and cause system's output abnormality change, so, can improve the system power supply stability.With the example that is combined as of solar photovoltaic Blast Furnace Top Gas Recovery Turbine Unit (TRT) and wind power generation blower fan device, the solar photovoltaic generating device can provide higher output electric energy in summer and daytime usually; Otherwise, the wind power generation blower fan device usually in the winter time with higher output electric energy can be provided night, therefore, can by power supply coordination and the scheduling of solar photovoltaic generating device and wind power generation blower fan device, can improve the system power supply stability.
See also Fig. 6, be the 3rd embodiment block schematic diagram of this electric power management device of the present invention.The 3rd embodiment and this second embodiment maximum difference are that the 3rd embodiment more comprises an energy storage device 60, with the storage of port redundancy electric energy that those generating set of renewable energy resource 101～10N is provided.Wherein, this energy storage device 60 electrically is connected in series a two-way electric energy converting unit 70; When those generating set of renewable energy resource 101～10N produces the electric energy output of redundancy, via these bidirectional power conversion these energy storage device 60 energy storage of 70 pairs of unit, when the electric energy output of those generating set of renewable energy resource 101～10N generation is not enough, via this energy storage device 60 stored electric energy of storage of these bidirectional power conversion unit 70 outputs.
See also Fig. 7, be the flow chart of this electric power management device method of operation of the present invention.This electric power management device and a regeneration energy source electric generating device and a load are electrically connected and form one first path, and form one second path with an electric main and this load electric connection.The step of this electric power management device method of operation comprises:
One electric energy converting unit is provided, changes the output electric energy of this generating set of renewable energy resource, to offer this electric main and this load (S100).This electric energy converting unit is electrically connected this generating set of renewable energy resource, is output as to change this generating set of renewable energy resource the output that exchanges that this electric main and this load can receive.That is to say, when this generating set of renewable energy resource is the Blast Furnace Top Gas Recovery Turbine Unit (TRT) of a direct current power supply generating, when being for example a solar photovoltaic (solar photovoltaic) Blast Furnace Top Gas Recovery Turbine Unit (TRT) or a fuel cell (fuel cell) Blast Furnace Top Gas Recovery Turbine Unit (TRT), but not as limit, this electric energy converting unit is a DC-AC converter (DC-to-ACconverter).Otherwise when this generating set of renewable energy resource was the Blast Furnace Top Gas Recovery Turbine Unit (TRT) of an AC power generating, when for example being a wind power generation blower fan device, but not as limit, this electric energy converting unit was an AC-AC transducer (AC-to-AC converter).
One first sensing cell and one second sensing cell (S200) are provided.This first sensing cell is electrically connected at this generating set of renewable energy resource and this load is electrically connected on formed this first path, with one first electric current and one first voltage that detects this first path.This second sensing cell is electrically connected at this electric main and this load is electrically connected on formed this second path, to detect one second electric current and a second voltage in this second path.
Provide one to switch switch element and a control unit (S300).This diverter switch unit is electrically connected at this electric main and this load is electrically connected on formed this second path.This control unit is electrically connected this electric energy converting unit, this first sensing cell, this second sensing cell and this diverter switch unit.
when this control unit is controlled this diverter switch unit and is conducting, this generating set of renewable energy resource and this electric main are electrically connected running with parallel way, that is, form the generating framework of commercial power parallel type (grid-connectionsystem), and this control unit is according to this first electric current and this first voltage, obtain the output electric energy of this at least one generating set of renewable energy resource, and this control unit is according to this second electric current and this second voltage, obtain being fed back to the electric energy of this electric main, and should export the difference of electric energy and this feedback electric energy, the electric energy (S400) that uses for this load.
When this control unit is controlled this diverter switch unit for cut-off, this generating set of renewable energy resource is separately to this load supplying (S500), that is, form the generating framework of self (stand-alone system), and provide this electric weight that load 30 is used by the electric energy that this generating set of renewable energy resource 10 produces, to reach self-centered supply of electric power.
When this at least one generating set of renewable energy resource is a plurality of generating set of renewable energy resource, the electric connection that is connected in parallel to each other of each this generating set of renewable energy resource.Wherein, each this generating set of renewable energy resource electrically is connected in series an external electric energy converting unit, then is electrically connected with this electric power management device; And each this external electric energy converting unit is controlled by this control unit,, those generating set of renewable energy resource can be electrically connected with parallel way turn round output that should generating set of renewable energy resource with conversion institute.
In addition, more provide an energy storage device, to store the port redundancy electric energy of those generating set of renewable energy resource.Wherein, this energy storage device electrically is connected in series a two-way electric energy converting unit; When those generating set of renewable energy resource produce the electric energy output of redundancy, via this bidirectional power conversion unit to this energy storage device energy storage, when the electric energy output that produces when those generating set of renewable energy resource is not enough, via this bidirectional power conversion unit exporting the stored electric energy of this energy storage device storage.
In sum, the present invention has advantages of following:
1, set up this diverter switch unit 406, changeable is the generating framework of commercial power parallel type (grid-connection system) or self (stand-alone system);
2, by this first sensing cell 404 and this second sensing cell 410 this first electric current I 1 and this first voltage V1 and this second electric current I 2 and this second voltage V2 detected respectively, the output electric energy of this generating set of renewable energy resource 10 that calculates and this are fed back to the electric energy of this electric main 20, and the intelligent power management further is provided;
3, by this second sensing cell 410 to detect this second voltage V2 of this second path L2, make when this second sensing cell 410 detects this second voltage V2 abnormal on the L2 of this second path, this diverter switch of this control unit 408 cut-offs unit 406, to isolate being connected of this electric main 20 and this generating set of renewable energy resource 10 and this load 30, so that protection mechanism to be provided;
4, a plurality of generating set of renewable energy resource 101～10N of configuration to form the construction for electricity of many group input sources, can increase the margin of system power supply, can avoid because of single input source abnormal, and cause system's output abnormality change, so, can improve stiffness of system and reliability; And
5, configuration one energy storage device 60, to store the port redundancy electric energy of those generating set of renewable energy resource 101～10N, make more elasticity of this renewable source of energy generation.
The above, only for the detailed description of preferred embodiment of the present invention and graphic, only feature of the present invention is not limited to this, be not to limit the present invention, all scopes of the present invention should be as the criterion with appended claim, and all closing in the embodiment of the spirit variation similar with it of claim of the present invention all should be contained in category of the present invention, anyly be familiar with this skill person in the field of the invention, can think easily and variation or modify and all can be encompassed in following the scope of the claims of the present invention.
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| CN111953068A (en) * | 2019-05-17 | 2020-11-17 | 台达电子工业股份有限公司 | Power conversion system and method of operation |
| CN112714711A (en) * | 2018-09-18 | 2021-04-27 | 克诺尔商用车制动系统有限公司 | System and method for providing redundant power |
| CN113346486A (en) * | 2021-06-08 | 2021-09-03 | 安徽信息工程学院 | Power supply method and system for new energy power generation hybrid scene |
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Application publication date: 20130619 |