CN101154828A - Networking intermittent renewable power supply network-merging equipment - Google Patents
Networking intermittent renewable power supply network-merging equipment Download PDFInfo
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- CN101154828A CN101154828A CNA2007100711338A CN200710071133A CN101154828A CN 101154828 A CN101154828 A CN 101154828A CN A2007100711338 A CNA2007100711338 A CN A2007100711338A CN 200710071133 A CN200710071133 A CN 200710071133A CN 101154828 A CN101154828 A CN 101154828A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a recyclable power control and power conversion device, in particular to a renewable energy and power conversion device which improves renewable energy efficiency and stability. The renewable energy such as a photovoltaic cell is of wide surface and large amount, and can be achieved in the way that many a little makes a mickle, when a plurality of independent renewable energy is inverted and combined to a power network, an impact to the power network is larger. If an effective control to a network is not done well, the operation efficiency of the power network is affected, even a paralysis of the power network can be caused. The device consists of an AD converter, a control circuit, a processor, a display circuit and a communication circuit. The invention is characterized in that a transformer with a plurality of taps are used in the control circuit, the processor, the communication circuit and a control circuit of the photovoltaic cell to control impedance of the photovoltaic cell, so output efficiency of the photovoltaic cell is the highest.
Description
One, technical field
The present invention relates to a kind of renewable power supply control and power supply inverter, particularly relate to a kind of regenerative resource control and power supply inverter that improves the renewable energy source efficiency, improves grid stability.
Two, background technology
Regenerative resource, large in number and widely distributed as photovoltaic cell can be taken care of the pence, and be when independently the regenerative resource inversion grid connection is to electrical network with several, bigger to the impulse ratio of electrical network.If do not do the operational efficiency that effective networking control can influence electrical network, serious caused electrical network paralysis.The present invention improves the quantity of operation of electrical network for improving generating efficiency.
Three, summary of the invention
The technical problem that solves:
(1) will solve photovoltaic cell power output maximum, most effective: photovoltaic cell output voltage-current characteristic and power output, Pm point as shown in Figure 2 has only when load impedance is suitable, the power maximum of its output, output most effective.
(2) to solve of the impact of renewable energy power generation inequality to electrical network: photovoltaic generation, generated output was big when light was strong, and generated output was little when light was weak, did not then generate electricity when unglazed.Wind power generation: when wind-force was big, the voltage height of its generating, electric current power big, output was big; Wind-force is little, and the output voltage of its generating is low, electric current is little, power output is little; Sometimes calm, inactivity output.Solve when a plurality of little users network collaborative the generating and improve the robustness of electric power system, reduce of the impact of the inhomogeneities of renewable energy power generation electric power system.
(3) solve intermittent renewable power supply grid-connection device networking control, " resonance " influence to electrical network takes place in a plurality of dispersions equipment work that generates electricity by way of merging two or more grid systems.
Technical scheme:
AD converter, control circuit, processor, display circuit, telecommunication circuit.
Utilize the transformer of a plurality of taps at the control circuit of photovoltaic cell, control its impedance, make the delivery efficiency of photovoltaic cell the highest.
Processor is to the controlled step of photovoltaic cell capable of generating power efficient in the regenerative resource grid-connection device: step 1, electric current, the voltage signal of input carried out the A/D conversion; Step 2 is carried out digital filtering to electric current, the voltage digital signal of importing; Step 3, to the processing of tabling look-up of filtered electric current, voltage, this table stores the relation and the optimum output power value of the output voltage of this photovoltaic cell power output and power supply; Step 4 is utilized the data of tabling look-up, and produces control signal, and the impedance of control supply convertor makes the delivery efficiency of photovoltaic cell the highest; Step 5, if system works is normal, fully loaded online generating if system works is undesired, then reduces the power generating, so that generation outage; And then get back to step 1.
Processor is as follows to the step of the impact control of regenerative resource in the regenerative resource grid-connection device: step 1, electric current, the voltage of importing is carried out the A/D conversion, and the value of importing is converted to numeral; Step 2 is carried out digital filtering to the data of input; Step 3 compares the value of nearest storage, if any unexpected variation, then generates electricity by way of merging two or more grid systems a little by in the bus reporting system each; Step 4 all increases suddenly if any the equal energy output of a plurality of points, and then control is generated electricity by way of merging two or more grid systems, and allows the networking of some point, and some points are not networked, and energy output is slowly increased gradually; As only being that this energy output increases suddenly, then controlling energy output increases fast, so that make full use of energy.Utilize the transformer of a plurality of taps at the control circuit of photovoltaic cell, control its impedance, make the delivery efficiency of photovoltaic cell the highest.
Utilize one-to-many variable connector switching transformer under different impedances, to work.
Useful effect:
Behind this equipment of use, the photoelectric conversion efficiency of photovoltaic cell is higher; The inhomogeneities of compensation photovoltaic generation, wind power generation; Utilize network service to coordinate the work of a plurality of equipment that generate electricity by way of merging two or more grid systems, reduce impact and the influence of accident, improve the robustness of operation power electric power system.
Four, description of drawings
The composition of Fig. 1 networking intermittent renewable power supply network-merging equipment.
The generating voltage of Fig. 2 photovoltaic cell, electric current and load characteristic are to the influence of power conversion efficiency (pce).
The transformer of the convertible impedance of Fig. 3.
The transformer connection layout of the convertible impedance of Fig. 4.
Fig. 5 process chart that independently generates electricity by way of merging two or more grid systems.
Fig. 6 network-type process chart that generates electricity by way of merging two or more grid systems.
Five, embodiment
Below in conjunction with accompanying drawing embodiments of the present invention are described in detail:
1, preferred embodiment 1 (system's composition)
System forms, and is illustrated in figure 1 as networked intermittent renewable energy grid-connection device composition frame chart, by 101 analog input sample circuits; 102 AD converter; The control appliance that 103DSP (digital signal processor), ARM (processor), MCU (single-chip microcomputer) form is the core of this equipment; 104 display circuits; 105 output control terminal mouths; 106 output control circuits; 107 telecommunication circuits are formed.
After the input of multi-channel analog data, through the multi-channel A transducer, carry out the AD conversion, output voltage with intermittent renewable power supply, electric current, temperature, the working temperature of regenerative resource etc. is converted to digital signal and is input to DSP after the AD conversion, ARM, processors such as MCU, processor is handled the data of input, and the situation of the ruuning situation of other circuit grid-connection device that provides according to network communications circuits and electrical network is regulated control circuit, the work of control control appliance, make regenerative resource make it to obtain higher efficient, electrical network is not impacted simultaneously, influence the normal operation of electrical network, the ruuning situation of its ruuning situation and electrical network and the situation of other grid-connection device show on display device.
DSP can adopt the DSP of ADI company, the dsp chip of TI company; The ARM chip can adopt chips such as ARM7, ARM920, ARM940, ARM922, ARM926, ARM946, ARM966; MCU can adopt 51 series monolithics, the single-chip microcomputer of Microchip company or other single-chip microcomputer.But be not limited to above several model, those of ordinary skills also can use other processor.
2, preferred embodiment 2 (control appliance changes the output impedance of power supply, improves generating efficiency)
The factor that influences the generating efficiency of photovoltaic cell has following 2 points: (1) load resistance influences photovoltaic cell performance: load resistance is big more, and the photoelectric current of generation is more little, and voltage is high more, and efficient may not be best, therefore must the suitable load resistance of control.(2) sun light intensity is to the influence of the generating efficiency of photovoltaic cell: short circuit current is directly proportional with luminous intensity, and open circuit voltage is directly proportional with the logarithm of luminous intensity, seek out best power output, and selected load resistance must be more little.(3) to the photovoltaic cell of different materials, as, the temperature of the efficient of generatings such as monocrystalline silicon, polysilicon, organic photovoltaic battery, chloroplaset and sun light wavelength, intensity, generating body etc. all has relation, therefore how to control the control circuit of photovoltaic cell, make load resistance appropriate, make photovoltaic cell obtain maximum delivery efficiency, it is the key of photovoltaic cell networking intermittent renewable power supply network-merging equipment that life-span of photovoltaic cell is prolonged as far as possible.
Be illustrated in figure 2 as the volt-ampere characteristic of polysilicon photovoltaic cell, 203 is the power curve of photovoltaic cell, 201 are the Voltammetric Relation when load resistance is 1 ohm, Voltammetric Relation when 202 Voltammetric Relation 204 when being 6 ohm for load resistance are 10 ohm for load resistance, 205 Voltammetric Relation when being 100 ohm for load resistance are by Fig. 2 finding, the Pm point is the optimum of power output, that is to say, when load resistance is 10 ohm among the figure, the power output maximum.
For solving existing photovoltaic cell optimum efficiency output, by the following technical solutions: utilize A/D converter that output voltage, the output current of photovoltaic cell are transformed to digital signal through A/D, utilize CPU that the electric current and the voltage digital signal of input are carried out Digital Signal Processing, generate the value of best input impedance, the input impedance of control power converting circuit, thus make the delivery efficiency of photovoltaic cell the highest.
The step of handling is as follows:
Step 2 is carried out digital filtering to electric current, the voltage digital signal of importing;
Step 3, to the processing of tabling look-up of filtered electric current, voltage, this table stores the relation and the optimum output power value of the output voltage of this photovoltaic cell power output and power supply;
Power supply output impedance translation circuit, Fig. 3 are a kind of impedance inverter circuit, and wherein 301 is primary coil, and 302 is magnetic core, and 303 is secondary coil.In primary coil, 1 pin has only a pin to be connected on the power supply for a pin of input power supply, 2-10 pin is the another one pin of power supply input in the 2-10 pin.Coil turn is few between the 1-2 pin as seen from the figure, and the access impedance of coil is little like this; Impedance maximum between the 1-10 pin; Utilize control circuit, 1 pin of photovoltaic cell output connects 1 pin of primary coil, another pin of photovoltaic cell is controlled at by control circuit selects a pin to connect (multi-channel switcher) between 2 pin-10 pin, as for which pin of control be connected, detect voltage, the electric current of photovoltaic cell, the temperature of photovoltaic cell etc. by control circuit and control automatically by the processor basis of the control circuit data that draw of tabling look-up with photovoltaic cell.Thereby make the generating efficiency of photovoltaic cell the highest, can not influence the life-span of photovoltaic cell simultaneously again.
Variable impedance transformator catenation principle figure as shown in Figure 4,401 is an output pin of 1 pin connection renewable power supply of variable impedance transformator.402 another one pin for variable impedance transformator connection renewable power supply.403 is variable connector, realizes the conversion of the different impedances of variable impedance transformator.
The control flow chart of this equipment of being illustrated in figure 5 as: 501 beginnings; 502 electric currents, voltage carry out the AD conversion; Data after the 503 pairs of AD conversion are carried out digital filtering; 504 pairs of filtered data lookup tables; The result that 505 bases are tabled look-up controls control circuit, and system works is normal, then is transformed into 507 fully loaded generating electricity by way of merging two or more grid systems, if the undesired power that then reduces generates electricity by way of merging two or more grid systems; Get back to 502 and continue circular treatment, form a closed-loop control system.
3, preferred embodiment 3 (power surges control)
The characteristic that the internal resistance of the inhomogeneities of photovoltaic cell capable of generating power, wind power generation inhomogeneities, fuel cell constantly changes, for giving full play to the efficient of power supply, when reducing the multi-user and networking collaborative generating to the impact of electric power system, improve the robustness of electric power system, by the following technical solutions: each device that independently generates electricity by way of merging two or more grid systems all adopts bus to link to each other, as when accident takes place, as, wind-driven generator has come a gust of wind suddenly, a black clouds breaks away, and one group of photovoltaic cell is subjected to irradiation of sunlight suddenly.If many miniature grid-connected systems just generate electricity by way of merging two or more grid systems and will electrical network be caused very big impact without control, even make the electrical network paralysis.
The step of control is as follows: flow chart as shown in Figure 6:
Step 2 is carried out digital filtering to the data of input, sees Figure 60 3;
Step 3 is handled generation, the operation curve of this generating equipment to the data of input; The data of analyzing electrical network obtain the operation curve of electrical network, see Figure 60 4;
Step 6 all increases suddenly if any the equal energy output of a plurality of points, and then control is generated electricity by way of merging two or more grid systems, and allows the networking of some point, and some points are not networked, and energy output is slowly increased gradually; As only being that this energy output increases suddenly, then controlling energy output increases fast, so that make full use of energy, sees Figure 60 7;
Step 7 is got back to step 1.
Value to nearest storage compares, and if any unexpected variation, then generates electricity by way of merging two or more grid systems a little by in the bus reporting system each;
Regenerative resource, large in number and widely distributed as photovoltaic cell can be taken care of the pence, and be when independently the regenerative resource inversion grid connection is to electrical network with several, bigger to the impulse ratio of electrical network.If do not carry out the operational efficiency that the effective control of networking can influence electrical network, serious caused electrical network paralysis.
Though in conjunction with the accompanying drawings embodiments of the present invention are described, those of ordinary skills can make various distortion or modification within the scope of the appended claims.
Claims (5)
1. networking intermittent renewable power supply network-merging equipment comprises:
AD converter, control circuit, processor, display circuit, telecommunication circuit;
It is characterized in that in control circuit, processor, telecommunication circuit:
Utilize the transformer of a plurality of taps at the control circuit of photovoltaic cell, control its impedance, make the delivery efficiency of photovoltaic cell the highest;
Processor is to photovoltaic cell capable of generating power efficient in the regenerative resource grid-connection device
Controlled step: step 1, electric current, the voltage signal of importing carried out the A/D conversion;
Step 2 is carried out digital filtering to electric current, the voltage digital signal of importing; Step 3,
To the processing of tabling look-up of filtered electric current, voltage, this table stores the relation and the optimum output power value of the output voltage of this photovoltaic cell power output and power supply; Step 4 is utilized the data of tabling look-up, and produces control signal, and the impedance of control supply convertor makes the delivery efficiency of photovoltaic cell the highest; Step 5, if system works is normal, fully loaded online generating if system works is undesired, then reduces the power generating, so that generation outage; And then get back to step 1;
Processor is as follows to the step of the impact control of regenerative resource in the regenerative resource grid-connection device: step 1, electric current, the voltage of importing is carried out the A/D conversion, and the value of importing is converted to numeral; Step 2 is carried out digital filtering to the data of input;
Step 3 compares the value of nearest storage, if any unexpected variation, then generates electricity by way of merging two or more grid systems a little by in the bus reporting system each; Step 4 all increases suddenly if any the equal energy output of a plurality of points, and then control is generated electricity by way of merging two or more grid systems, and allows the networking of some point, and some points are not networked, and energy output is slowly increased gradually; As only being that this energy output increases suddenly, then controlling energy output increases fast, so that make full use of energy.
2. according to the described networking intermittent renewable power supply network-merging equipment of claim 1, it is characterized in that: utilize the transformer of a plurality of taps at the control circuit of photovoltaic cell, control its impedance, make the delivery efficiency of photovoltaic cell the highest.
3. according to claim 1 or the described networking intermittent renewable power supply network-merging equipment of claim 2, it is characterized in that: utilize one-to-many variable connector switching transformer under different impedances, to work.
4. according to claim 1 networking intermittent renewable power supply network-merging equipment, it is characterized in that:
Step 1 is carried out the A/D conversion to electric current, the voltage signal of importing; Step 2 is carried out digital filtering to electric current, the voltage digital signal of importing; Step 3, to the processing of tabling look-up of filtered electric current, voltage, this table stores the relation and the optimum output power value of the output voltage of this photovoltaic cell power output and power supply; Step 4 is utilized the data of tabling look-up, and produces control signal, and the impedance of control supply convertor makes the delivery efficiency of photovoltaic cell the highest; Step 5, if system works is normal, fully loaded online generating if system works is undesired, then reduces the power generating, so that generation outage; And then get back to step 1.
5. according to the described networking intermittent renewable power supply network-merging equipment of claim 1, it is characterized in that: processor is as follows to the step of the impact control of regenerative resource in renewable microgrid energy grid-connection device: step 1, electric current, voltage, ambient temperature, the electric current of electrical network, voltage to input carry out the A/D conversion, and the value of importing is converted to numeral; Step 2 is carried out digital filtering to the data of input; Step 3 is handled generation, the operation curve of this generating equipment to the data of input; The data of analyzing electrical network obtain the operation curve of electrical network; Step 4, utilize network service obtain other generating equipments operation curve; Step 5 is analyzed the data of this generating equipment, the data of other generating equipments, the service data of electrical network, and the operation of this generating equipment is controlled in the operation of prediction electrical network, makes whole electrical network keep robustness; Step 6 all increases suddenly if any the equal energy output of a plurality of points, and then control is generated electricity by way of merging two or more grid systems, and allows the networking of some point, and some points are not networked, and energy output is slowly increased gradually; As only being that this energy output increases suddenly, then controlling energy output increases fast, so that make full use of energy; Step 7 is got back to step 1.
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| CNA2007100711338A CN101154828A (en) | 2007-09-18 | 2007-09-18 | Networking intermittent renewable power supply network-merging equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386808A (en) * | 2011-11-07 | 2012-03-21 | 重庆电力高等专科学校 | Photovoltaic controller with maximum power point tracking function |
| CN102622034A (en) * | 2012-03-14 | 2012-08-01 | 浙江大学 | Maximum power point tracking (MPPT) controller for solar photovoltaic system and control method of MPPT controller |
| CN108539792A (en) * | 2018-05-15 | 2018-09-14 | 山东大学 | Micro-capacitance sensor internal unit fast evaluation method based on look-up table |
| CN108879768A (en) * | 2018-07-11 | 2018-11-23 | 佛山市众盈电子有限公司 | A kind of compatible input of clean energy resource and its Intellectual power output controlling and regulating system |
-
2007
- 2007-09-18 CN CNA2007100711338A patent/CN101154828A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386808A (en) * | 2011-11-07 | 2012-03-21 | 重庆电力高等专科学校 | Photovoltaic controller with maximum power point tracking function |
| CN102386808B (en) * | 2011-11-07 | 2014-09-24 | 重庆电力高等专科学校 | Photovoltaic controller with maximum power point tracking function |
| CN102622034A (en) * | 2012-03-14 | 2012-08-01 | 浙江大学 | Maximum power point tracking (MPPT) controller for solar photovoltaic system and control method of MPPT controller |
| CN108539792A (en) * | 2018-05-15 | 2018-09-14 | 山东大学 | Micro-capacitance sensor internal unit fast evaluation method based on look-up table |
| CN108539792B (en) * | 2018-05-15 | 2020-01-14 | 山东大学 | Method for rapidly evaluating internal equipment of microgrid based on table lookup method |
| CN108879768A (en) * | 2018-07-11 | 2018-11-23 | 佛山市众盈电子有限公司 | A kind of compatible input of clean energy resource and its Intellectual power output controlling and regulating system |
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