CN110474600B - Control circuit based on input independent output series power generation circuit - Google Patents
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- 238000010248 power generation Methods 0.000 title claims abstract description 51
- 238000007667 floating Methods 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 238000013459 approach Methods 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000011161 development Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/20—Systems characterised by their energy storage means
-
- 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
-
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention relates to a control circuit based on an input independent output series power generation circuit, which comprises n unit power generation circuits with independent input signals and series output signals, wherein each unit power generation circuit is provided with a DC/DC unit and a controller for controlling the DC/DC unit. When the output voltage of the power generation circuit is too high, the controller controls each DC/DC unit so that the output voltage of each DC/DC unit is controlled to be within a predetermined value; when the output voltage of the power generation circuit is too low, the controller drives the MPPT control circuit, so that the DC/DC unit works in an MPPT mode. The circuit can automatically judge the working state of the DC/DC unit, control the DC/DC unit to work in an MPPT mode or a constant voltage output mode, and realize quick charging and floating charging of the storage battery pack.
Description
Technical Field
The invention belongs to the technical field of control of a DC/DC circuit of an aerostat energy system, and relates to a control circuit based on an input independent output series power generation circuit.
Background
The energy system provides high-quality bus voltage for all single machines when the aerostat operates normally, wherein the power supply controller is one of the important components of the energy system. With the development of the whole technology of the aerostat, the requirement of long-term air-parking time and the increase of the mission load of the airship, the requirement on the power level of an energy system is higher and higher, a high-voltage bus (300V-600V) power supply mode is required to be adopted for the high-voltage high-power development requirement of an aircraft, and the energy transmission efficiency is improved. The standard DC/DC unit is adopted to be connected in series for boosting, an input independent output series power generation circuit is formed, the development direction of an aerostat energy system is inevitably formed, and the maximum power tracking of each path of input solar cell array and the charging control of a storage battery pack are realized.
At present, researches on input independent output series power generation circuits are few, and no control circuit and method suitable for any number of series boosting of standard DC/DC units exist.
Disclosure of Invention
The invention provides a control circuit and a control method based on an input independent output series power generation circuit, aiming at solving the technical problem of power generation control of the input independent output series power generation circuit that the stable work is difficult.
The invention provides a control circuit based on an input independent output series power generation circuit, wherein a total power generation circuit comprises n unit power generation circuits with independent input signals and series output signals, each unit power generation circuit is provided with a DC/DC unit, and a controller for controlling the DC/DC units;
the controller circuit of each unit power generation circuit includes:
the MPPT control circuit is provided with two input ends which are respectively connected with the input voltage and the input current of the current unit power generation circuit; the input voltage and the input current of the current unit power generation circuit are provided by the solar cell array corresponding to the current unit;
a first comparator, one input end of which inputs the sampling value V' o of the output voltage of the total power generation circuit, and the other input end of which inputs a first reference value Vref 1;
one input end of the adder is connected with the output end of the first comparator, and the other input end of the adder is connected with the MPPT control circuit;
the state interface of the reference voltage adjusting module is connected with the output end of the first comparator, and two input ends of the reference voltage adjusting module are respectively input into the output voltage sampling value V' om of the current unit generating circuit and the first reference value Vref 1; the current unit generating circuit output voltage sampling value V' om is a DC/DC unit output voltage sampling value controlled by the current controller;
the voltage Vref2 output by the reference voltage regulation module is a superposed value of the output voltage sampling value V' om of the current unit generating circuit and the set step length;
the positive end of the operational amplifier is connected with the output end of the reference voltage regulating module, and the negative end of the operational amplifier inputs V' om;
a minimum value taking circuit, one input end of which is connected with the output end of the operational amplifier, and the other input end of which is connected with the output end of the adder;
and the positive input end of the second comparator (COM2) is connected with the output end of the minimum value taking circuit, the negative input end of the second comparator (COM2) is connected with a fixed carrier, a signal obtained by the positive input end of the second comparator (COM2) is compared with the carrier to generate a square wave, and the square wave is amplified by the driving circuit and then controls the DC/DC unit of the current unit generating circuit.
Preferably, when the sampled value V' o of the total power generation circuit output voltage is less than the set first reference value Vref1, the first comparator outputs a low level; at this time, the input state of the state interface of the reference voltage regulating module is 0, and the reference voltage regulating module outputs a voltage Vref2, so that the output voltage of the operational amplifier is higher than that of the MPPT control circuit; the output signal of the first comparator and the output signal of the MPPT control circuit are superposed through the adder to maintain the signal of the MPPT control circuit, and at the moment, the minimum circuit is selected to select the signal of the MPPT control circuit, so that the DC/DC unit works in an MPPT mode.
Preferably, when V 'o is less than the set first reference value Vref1, the voltage Vref2 output by the reference voltage adjustment module is equal to the superimposed value of V' om and the first set step Δ V1.
Preferably, when V' o is equal to or greater than the set first reference value Vref1, the first comparator outputs a high level; at the moment, the input state of the state interface of the reference voltage regulating module is 1, and the output voltage Vref2 gradually approaches to Vref 1/n; the operational amplifier amplifies the difference between Vref2 and V' om and outputs a control signal; the output signal of the first comparator and the output signal of the MPPT control circuit are superposed by the adder and then are larger than the output signal of the operational amplifier, and at the moment, the minimum circuit is used for selecting the output signal of the operational amplifier, so that the DC/DC unit works in a floating charge mode.
Preferably, the reference voltage adjusting module gradually approaches the output voltage Vref2 to Vref1/n, and comprises:
setting the output voltage Vref2 to V' om, setting the second step size to be delta V2, and then comparing the Vref2 with Vref 1/n;
if Vref2 is greater than Vref1/n, Vref2 is Vref2- Δ V2; then the Vref2 is compared with Vref1/n and approaches to Vref1/n gradually;
if Vref2 is less than Vref1/n, Vref2 is Vref2+ Δ V2; then the Vref2 is compared with Vref1/n and approaches to Vref1/n gradually;
if Vref2 equals Vref1/n, Vref2 is output directly.
Preferably, the input of the unit power generation circuit is a solar cell array, and the positive and negative electrodes of the solar cell array are connected with the positive and negative input ends of the DC/DC unit;
and the output end of the power generation circuit is connected with a load or a storage battery pack.
Preferably, the power generation circuit is connected with a load or a storage battery pack and then connected with a first filter capacitor in parallel.
Preferably, the positive electrode of the output end of the DC/DC unit of each unit power generation circuit is connected to the N electrode of the diode, and the negative electrode is connected to the P electrode of the diode.
Preferably, the diode is further provided with a second filter capacitor in parallel.
The control circuit based on the input independent output series power generation circuit has the advantages that the circuit can automatically judge the working state of the DC/DC unit, control the DC/DC unit to work in an MPPT mode or a constant voltage output mode, and realize quick charging and floating charging of a storage battery pack. The invention can output any number of DC/DC units in series, and the output voltage of the circuit is automatically equalized when the circuit works in a floating charge mode, thereby realizing the quick charge of the storage battery pack with any voltage class.
Drawings
FIG. 1 is a schematic diagram of an input-independent-output series power generation circuit;
FIG. 2 is a schematic diagram of a circuit configuration of the controller according to the present invention;
FIG. 3 is a flow chart of the operation of the reference voltage regulation module of the present invention.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further explained in detail with the accompanying drawings and the specific embodiments, but the scope of the invention is not limited in any way.
As shown in fig. 1, the total power generation circuit of the present invention includes n unit power generation circuits having independent input signals and serially connected output signals, each unit power generation circuit is provided with a solar cell array to provide input voltage and input current for the unit power generation circuit, and each unit power generation circuit is provided with a DC/DC unit and a controller to control the DC/DC unit. The high voltage output by the solar cell array after series connection is used for charging the storage battery or supplying power for a load. And the total generating circuit is connected with a load or a storage battery pack and then is connected with a first filter capacitor in parallel. The positive pole of the output end of the DC/DC unit of each unit generating circuit is connected with the N pole of the diode, and the negative pole of the output end of the DC/DC unit of each unit generating circuit is connected with the P pole of the diode; and the diode is connected in parallel with a second filter capacitor.
As shown in fig. 2, the controller circuit of each unit power generation circuit includes: an MPPT control circuit having two input terminals respectively connected to the input voltage V 'of the current unit power generation circuit'in1And an input current I'in2(ii) a Input voltage V'in1And an input current I'in2The solar cell array is provided by the solar cell array corresponding to the current unit; a first comparator (COM1), one input end of which inputs the sampling value V' o of the total power generation circuit output voltage, and the other input end of which inputs a first reference value Vref 1; the state interface of the reference voltage adjusting module is connected with the output end of the first comparator (COM1), and two input ends of the reference voltage adjusting module are respectively input into a DC/DC unit output voltage sampling value (namely the current unit generating circuit output voltage sampling value V' om) controlled by the current controller and a first reference value Vref 1; an adder, one input end of which is connected with the output end of the first comparator (COM1), and the other input end of which is connected with the output end of an MPPT (maximum power point tracking) control circuit; the state interface of the reference voltage adjusting module is connected with the output end of the first comparator (COM1) and is used for outputting a current unit generating circuit output voltage sampling value V' om and a superposition value Vref2 of a set step length; an operational amplifier (OP1), the positive end of which is connected with the output end of the reference voltage regulating module, and the negative end of which is input with V' om; a minimum value taking circuit, one input end of which is connected with the output end of the operational amplifier (OP1), and the other input end of which is connected with the output end of the adder; the positive input end of the second comparator (COM2) is connected with the output end of the minimum value taking circuit, the negative input end of the second comparator (COM2) is connected with a fixed carrier wave (triangular wave), a signal of the positive input end of the second comparator (COM2) is compared with the carrier wave to generate a square wave (PWM wave), and the square wave (PWM wave) is amplified by the driving circuit and used for controlling the DC/DC unit of the current unit generating circuit.
The working principle of the invention is as follows:
when V' o is less than the set first reference value Vref1, the first comparator (COM1) outputs a low level; at this time, the state interface input state of the reference voltage regulating module is 0, and the reference voltage regulating module sets the output voltage Vref2 to be a superposition value of V' om and a first setting step delta V1, so that the output voltage of the operational amplifier (OP1) is higher than the output voltage of the MPPT control circuit; the output signal of the first comparator (COM1) and the output signal of the MPPT control circuit are superposed through the adder to maintain the signal of the MPPT control circuit, and at the moment, the minimum circuit selects the signal of the MPPT control circuit, so that the DC/DC unit works in the MPPT mode.
When V' o is equal to or greater than the set first reference value Vref1, the first comparator (COM1) outputs a high level; at this time, the input state of the state interface of the reference voltage regulating module is 1, and the reference voltage regulating module gradually approaches the output voltage Vref2 to Vref1/n (assuming that n unit generating circuits are provided in total); the operational amplifier (OP1) amplifies the difference between Vref2 and V' om and outputs a control signal; the output signal of the first comparator (COM1) and the output signal of the MPPT control circuit are superposed by the adder and then are larger than the output signal of the operational amplifier (OP1), and at the moment, the minimum circuit is used for selecting the output signal of the operational amplifier (OP1), so that the DC/DC unit works in a floating charge mode, and the output equal voltage of each series unit generating circuit is realized.
As shown in FIG. 3, the method for the reference voltage regulation module to gradually approach the output voltage Vref2 to Vref1/n is as follows:
firstly, setting the output voltage Vref2 as V' om, setting the second step length as delta V2, and then comparing the Vref2 with Vref 1/n;
if Vref2 is greater than Vref1/n, Vref2 is Vref2- Δ V2; then the Vref2 is compared with Vref1/n and approaches to Vref1/n gradually;
if Vref2 is less than Vref1/n, Vref2 is Vref2+ Δ V2; then the Vref2 is compared with Vref1/n and approaches to Vref1/n gradually;
if Vref2 equals Vref1/n, Vref2 is output directly.
In the power generation circuit, each DC/DC unit is provided with the same control circuit, so that the corresponding DC/DC unit is controlled to work in an MPPT mode or a floating charge mode, and the serial output of any number of DC/DC units can be realized.
While the present invention has been described in detail by way of the foregoing preferred examples, it is to be understood that the above description is not to be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. A control circuit based on an input independent output series power generation circuit is characterized in that a total power generation circuit comprises n unit power generation circuits with independent input signals and series output signals, each unit power generation circuit is provided with a DC/DC unit, and a controller for controlling the DC/DC units;
the controller circuit of each unit power generation circuit includes:
the MPPT control circuit is provided with two input ends which are respectively connected with the input voltage and the input current of the current unit power generation circuit; the input voltage and the input current of the current unit power generation circuit are provided by the solar cell array corresponding to the current unit;
a first comparator (COM1), one input end of which inputs the sampling value V' o of the total power generation circuit output voltage, and the other input end of which inputs a first reference value Vref 1;
an adder, one input of which is connected with the output end of the first comparator (COM1), and the other input of which is connected with the output end of the MPPT control circuit;
the state interface of the reference voltage adjusting module is connected with the output end of the first comparator (COM1), and two input ends of the reference voltage adjusting module are respectively input with the output voltage sampling value V' om of the current unit generating circuit and the first reference value Vref 1; the current unit generating circuit output voltage sampling value V' om is the output voltage sampling value of the DC/DC unit controlled by the current controller;
the voltage Vref2 output by the reference voltage regulation module is a superposed value of the output voltage sampling value V' om of the current unit generating circuit and the set step length;
an operational amplifier (OP1), the positive end of which is connected with the output end of the reference voltage regulating module, and the negative end of which is input with V' om;
a minimum value taking circuit, one input end of which is connected with the output end of the operational amplifier (OP1), and the other input end of which is connected with the output end of the adder;
and the positive input end of the second comparator (COM2) is connected with the output end of the minimum value taking circuit, the negative input end of the second comparator (COM2) is connected with a fixed carrier, a signal obtained by the positive input end of the second comparator (COM2) is compared with the carrier to generate a square wave, and the square wave is amplified by the driving circuit and then controls the DC/DC unit of the current unit generating circuit.
2. The control circuit of claim 1, wherein the first comparator (COM1) outputs a low level when the sampled value V' o of the total power generation circuit output voltage is less than the set first reference value Vref 1; at this time, the input state of the state interface of the reference voltage regulating module is 0, and the output voltage Vref2 of the reference voltage regulating module makes the output voltage of the operational amplifier (OP1) higher than that of the MPPT control circuit; the output signal of the first comparator (COM1) and the output signal of the MPPT control circuit are superposed through the adder to maintain the signal of the MPPT control circuit, and at the moment, the minimum circuit selects the signal of the MPPT control circuit, so that the DC/DC unit works in the MPPT mode.
3. The input-independent output-based control circuit of claim 2, wherein when V 'o is less than the set first reference value Vref1, the voltage Vref2 output by the reference voltage adjustment module is equal to the sum of V' om and the first set step size Δ V1.
4. The control circuit of claim 2, wherein the first comparator (COM1) outputs a high level when V' o is equal to or greater than a set first reference value Vref 1; at the moment, the input state of the state interface of the reference voltage regulating module is 1, and the output voltage Vref2 gradually approaches to Vref 1/n; the operational amplifier (OP1) amplifies the difference between Vref2 and V' om and outputs a control signal; the output signal of the first comparator (COM1) and the output signal of the MPPT control circuit are superposed by the adder and then are larger than the output signal of the operational amplifier (OP1), and at the moment, the minimum circuit is used for selecting the output signal of the operational amplifier (OP1), so that the DC/DC unit works in a floating charge mode.
5. The input-independent output-series power generation circuit based control circuit as claimed in claim 4, wherein said reference voltage adjusting module gradually approaches the output voltage Vref2 towards Vref1/n, comprising:
setting the output voltage Vref2 to V' om, setting the second step size to be delta V2, and then comparing the Vref2 with Vref 1/n;
if Vref2 is greater than Vref1/n, Vref2 is Vref2- Δ V2; then the Vref2 is compared with Vref1/n and approaches to Vref1/n gradually;
if Vref2 is less than Vref1/n, Vref2 is Vref2+ Δ V2; then the Vref2 is compared with Vref1/n and approaches to Vref1/n gradually;
if Vref2 equals Vref1/n, Vref2 is output directly.
6. The control circuit of any one of claims 1-5, wherein the positive and negative electrodes of the solar cell array are connected to the positive and negative input terminals of the DC/DC unit; and the output end of the total power generation circuit is connected with a load or a storage battery pack.
7. The control circuit of claim 6, wherein the total power generation circuit is connected to a load or a battery pack and then connected in parallel with a first filter capacitor.
8. The control circuit of claim 7, wherein the positive pole of the output terminal of the DC/DC unit of each unit power generation circuit is connected to the N pole of the diode, and the negative pole of the output terminal of the DC/DC unit of each unit power generation circuit is connected to the P pole of the diode.
9. The control circuit of claim 8, wherein the diode further comprises a second filter capacitor connected in parallel.
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| WO2006005125A1 (en) * | 2004-07-13 | 2006-01-19 | Central Queensland University | A device for distributed maximum power tracking for solar arrays |
| CN102044988A (en) * | 2009-10-22 | 2011-05-04 | 群光电能科技股份有限公司 | Solar electric generating system for decentralized execution of maximum power point tracking and solar battery thereof |
| CN103166239A (en) * | 2011-12-09 | 2013-06-19 | 上海康威特吉能源技术有限公司 | Centralized-distributed mixed novel energy power generation system and maximum power point tracking control method |
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