CN103050968B - Electric power system and electrical control method thereof and device - Google Patents
Electric power system and electrical control method thereof and device Download PDFInfo
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- CN103050968B CN103050968B CN201110306335.2A CN201110306335A CN103050968B CN 103050968 B CN103050968 B CN 103050968B CN 201110306335 A CN201110306335 A CN 201110306335A CN 103050968 B CN103050968 B CN 103050968B
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Abstract
The present invention discloses a kind of electric power system and power control unit thereof and electrical control method, and this electrical control method comprises the following step.First, the first proportional integral computing is carried out according to input current signal and instruction.Then, judge whether input current signal is greater than the maximum rated charging current value of battery unit, produce the switching signal controlling brake units with correspondence.Then, the second proportional integral computing is carried out according to output voltage signal and predeterminated voltage instruction.Subsequently, comparison output voltage signal and voltage instruction, optionally to arrange output current instruction.Then, carry out the 3rd proportional integral computing according to output current signal and instruction, with adjust first to and second pair of switching signal, make switch element perform corresponding switching action and regulation output voltage signal.
Description
Technical field
The invention relates to a kind of electric power system, and the electrical control method related to especially in a kind of electric power system and device.
Background technology
In recent years, due to the new line of environmental consciousness, the technology of the renewable energy resources is developed rapidly.Among these renewable energy resources, wind power generation is a kind of simple and generation mode of no pollution, the flabellum of the wind drive wind-driven generator that it utilizes nature to produce, exports extraneous wind-force to be converted to electric power, and then the electric power that feeding assembly (as: battery) is certain.
But when extraneous wind-force is excessive, the flabellum rotating speed of wind-driven generator also increases, and the charging current making wind-driven generator produce is greater than the maximum rated current of battery, and affects the working life of battery thereupon.Moreover, in the control circuit of known wind generator system, the rotating speed of wind-driven generator may be subject to the output voltage impact of battery, cause the generating efficiency of whole wind generator system to promote, and between wind-driven generator and battery, need the longer time just can reach the stable of constrained input energy.
Therefore, hitherto known technology still has above-mentioned shortcomings and deficiencies part needs to solve.
Summary of the invention
The object of the invention is to for solving the problems of the technologies described above and providing a kind of electric power system and electrical control method thereof and device.
The object of the invention is to provide a kind of power control unit, comprises input, output, control unit and switch element.Input in order to receive generator provide energy corresponding input voltage signal and input current signal.Output is in order to transmit output voltage signal and output current signal to battery unit.Control unit electric property coupling input and output, and in order to produce multiple switching signal according to input voltage signal, input current signal, output voltage signal and output current signal, one in switching signal is that the input current signal that input is received changes in order to the brake units of opening or closing and input coupling.Switch element electric property coupling input, output and control unit, and in the switching signal produced by control unit at least one control with regulation output voltage signal.
According to an embodiment disclosed by the invention, wherein control unit comprises the first comparing module and the first pi controller.First comparing module in order to the input current instruction of comparison input current signal and the corresponding maximum power output of input voltage signal, to export the first difference.First pi controller electric property coupling first comparing module, in order to receive the first difference, and makes calculation process with segmentation scales integral way to the first difference, exports to produce the first proportional integral.
According to an embodiment disclosed by the invention, wherein control unit more comprises the first judge module.First judge module electric property coupling first pi controller, in order to judge whether input current signal is greater than the maximum rated charging current value of battery unit, control unit is made to produce according to the judged result of the first judge module the switching signal controlling brake units.
According to an embodiment disclosed by the invention, wherein control unit more comprises the second comparing module and the second pi controller.The voltage instruction that second comparing module is preset in order to comparison output voltage signal and battery unit, to export the second difference.Second pi controller electric property coupling second comparing module, in order to receive the second difference, and makes calculation process with segmentation scales integral way to the second difference, exports to produce the second proportional integral.
According to an embodiment disclosed by the invention, wherein control unit more comprises the first selection module.First selects module electric property coupling first judge module and the second pi controller, wherein first select module according to output voltage signal and the comparative result of voltage instruction optionally arrange the first proportional integral export or the second proportional integral to export be output current instruction.
According to an embodiment disclosed by the invention, wherein control unit more comprises the 3rd comparing module, the 3rd pi controller and the second judge module.3rd comparing module in order to comparison output current signal and output current instruction, to export the 3rd difference.3rd pi controller electric property coupling the 3rd comparing module, in order to receive the 3rd difference, and makes calculation process with segmentation scales integral way to the 3rd difference, exports to produce the 3rd proportional integral.Second judge module electric property coupling the 3rd pi controller, and according to first pair of switching signal in the 3rd proportional integral output decision control unit output switching signal and second pair of switching signal, and control unit exports adjustment first pair of switching signal and second pair of switching signal according to the 3rd proportional integral, switch element is made to perform corresponding switching action, with regulation output voltage signal.
According to an embodiment disclosed by the invention, wherein when first selects module installation first proportional integral to export as output current instruction, power control unit charges to battery unit with output current signal fixing haply, when first selects module installation second proportional integral to export as output current instruction, power control unit charges to battery unit with output voltage signal fixing haply.
Another object of the present invention is to provide a kind of electric power system, comprise power input end, power output end, brake switch, control unit and switch element.Power input end in order to receive generator provide energy corresponding input voltage signal and input current signal.Power output end is in order to transmit output voltage signal and output current signal to battery unit.Brake switch electric property coupling power input end, in order to regulate input current signal.Control unit electric property coupling power input end and power output end, and in order to produce multiple switching signal according to input voltage signal, input current signal, output voltage signal and output current signal, one in switching signal is that the input current signal that power input end is received changes in order to open or to close brake switch.Switch element electric property coupling power input end, power output end and control unit, and in the switching signal produced by control unit at least one control with regulation output voltage signal.
According to an embodiment disclosed by the invention, wherein control unit is compared and segmentation scales integral operation to input voltage signal, input current signal, output voltage signal, output current signal, voltage instruction and current-order, with output switching signal.
According to an embodiment disclosed by the invention, wherein switch element comprises the first switch, second switch, the 3rd switch, the 4th switch and inductance.First switch electric property coupling control unit and power input end.Second switch electric property coupling control unit and power output end.3rd switch electric property coupling control unit, the first switch and earth terminal.4th switch electric property coupling control unit, second switch and earth terminal.Between inductance electric property coupling first switch, second switch, the 3rd switch and the 4th switch, the first switch, second switch, the 3rd switch, the 4th switch and inductance form H type electric bridge.
According to an embodiment disclosed by the invention, wherein control unit controls the ON time of the first switch and the 3rd switch through pair switching signal of first in switching signal, to reduce output voltage signal.
According to an embodiment disclosed by the invention, wherein first pair of switching signal is complementary pulse-width modulation signal.
According to an embodiment disclosed by the invention, wherein control unit controls the ON time of second switch and the 4th switch through pair switching signal of second in switching signal, to increase output voltage signal.
According to an embodiment disclosed by the invention, wherein second pair of switching signal is complementary pulse-width modulation signal.
According to an embodiment disclosed by the invention, another wherein in the more exportable switching signal of control unit, to open or to close the load switch coupled with power output end.
Another object of the present invention is to provide a kind of electrical control method, comprise the following step.According to generator provide energy corresponding input current signal and the input current instruction of the corresponding maximum power output of input voltage signal carry out the first proportional integral computing.Then, judge whether input current signal is greater than the maximum rated charging current value of battery unit.When input current signal is greater than the maximum rated charging current value of battery unit, produce the switching signal controlling brake units.Then, the voltage instruction preset according to output voltage signal and battery unit carries out the second proportional integral computing.Subsequently, comparison output voltage signal and voltage instruction.Then, the first proportional integral computing is optionally set according to the comparison result of output voltage signal and voltage instruction or the second proportional integral operation result is output current instruction.Then, the 3rd proportional integral computing is carried out according to output current signal and output current instruction.Subsequently, adjust first pair of switching signal and second pair of switching signal according to the 3rd proportional integral operation result, make switch element perform corresponding switching action, with regulation output voltage signal.
According to an embodiment disclosed by the invention, wherein the first proportional integral computing, the second proportional integral computing and the 3rd proportional integral computing are that Error Gain function and integral gain function are divided into multiple piecewise interval, the yield value making control unit corresponding to piecewise interval carries out calculation process, and under the operation of segmentation scales integral way, accelerate the time of calculation process.
According to an embodiment disclosed by the invention, wherein carry out the first proportional integral computing and more comprise the following step.The input current instruction of comparison input current signal and the corresponding maximum power output of input voltage signal, to export the first difference.Utilize segmentation scales integral way to make calculation process to the first difference, export to produce the first proportional integral.
According to an embodiment disclosed by the invention, wherein carry out the second proportional integral computing and more comprise the following step.The voltage instruction that comparison output voltage signal and battery unit are preset, to export the second difference.Utilize segmentation scales integral way to make calculation process to the second difference, export to produce the second proportional integral.
According to an embodiment disclosed by the invention, wherein carry out the 3rd proportional integral computing and more comprise the following step.Comparison output current signal and output current instruction, to export the 3rd difference.Utilize segmentation scales integral way to make calculation process to the 3rd difference, export to produce the 3rd proportional integral.
According to an embodiment disclosed by the invention, wherein when output voltage signal is less than voltage instruction, first proportional integral operation result is set to output current instruction, battery unit is charged according to output current signal fixing haply, when output voltage signal equals voltage instruction, second proportional integral operation result is set to output current instruction, and battery unit is charged according to output voltage signal fixing haply.
According to an embodiment of this disclosure, wherein first pair of switching signal and second pair of switching signal are complementary pulse-width modulation signal.
According to an embodiment of this disclosure, electrical control method more comprise in output switching signal another, with the unlatching of control load unit or closedown.
Therefore, apply the electric power system of this disclosure, power control unit and electrical control method, can the energy that produces of equilibrium assignment wind-driven generator to battery unit and brake units, and make wind-driven generator, between battery unit and brake units, reach stable state fast.
Accompanying drawing explanation
For above and other objects of the present invention, feature, advantage and embodiment can be become apparent, appended accompanying drawing is described as follows:
Fig. 1 is the circuit box schematic diagram of the electric power system according to one embodiment of the present invention.
Fig. 2 is the circuit box schematic diagram of the control unit according to one embodiment of the present invention (such as shown in Fig. 1).
Fig. 3 is the time diagram of the charge mode according to battery unit in one embodiment of the present invention.
Fig. 4 is the circuit box schematic diagram of the electric power system according to one embodiment of the present invention.
Fig. 5 is the sequencing control schematic diagram of the decompression mode according to electric power system in one embodiment of the present invention.
Fig. 6 is the sequencing control schematic diagram of the boost mode according to electric power system in one embodiment of the present invention.
Fig. 7 is the flow chart of steps of the electrical control method according to one embodiment of the present invention.
Fig. 8 A is the Error Gain function schematic diagram of the proportional integral mode according to one embodiment of the present invention.
Fig. 8 B is the segmentation error gain function schematic diagram of the proportional integral mode according to one embodiment of the present invention.
Fig. 9 A is the integral gain function schematic diagram of the proportional integral mode according to one embodiment of the present invention.
Fig. 9 B is the subsection integral gain function schematic diagram of the proportional integral mode according to one embodiment of the present invention.
Figure 10 is the sequencing control schematic diagram exported according to the transfer function of the proportion of utilization integral way of one embodiment of the present invention.
Wherein, description of reference numerals is as follows:
100,400: electric power system
110: input
120: output
130,440: control unit
140,450: switch element
1000: power control unit
1010,4010: generator
1020,4030: battery unit
1030: brake units
1040: load unit
200: the first comparing module
210: the first pi controllers
220: the first judge modules
230: the second comparing module
240: the second pi controllers
Select module at 250: the first
260: the three comparing module
270: the three pi controllers
280: the second judge modules
410: power input end
420: power output end
430: brake switch
451 ~ 454: the first switch ~ the 4th switch
455: inductance
460: earth terminal
4020: rectification unit
4040: brake resistor
4050: load switch
4060: load device
710 ~ 790: step
Embodiment
Below will with graphic and describe in detail and clearly demonstrate spirit of the present invention; any person of ordinary skill in the field is after understanding preferred embodiment disclosed by the invention; when the technology can instructed by the present invention, be changed and modify, it does not depart from protection scope of the present invention.
About " about " used herein, " approximately " or " roughly " be commonly the error of exponential quantity or scope within 20 percent, be then more preferably preferably within 10 within 5 percent.Wen Zhongruo is without clearly stating, and the numerical value mentioned by it all regards as approximation, namely as " about ", " approximately " or the error represented by " roughly " or scope.
Please refer to Fig. 1.Fig. 1 is the circuit box schematic diagram of the electric power system 100 according to one embodiment of the present invention.
Above-mentioned electric power system 100 can comprise power control unit 1000 and with the generator 1010 of power control unit 1000 electric property coupling, battery unit 1020 and brake units 1030, the energy that wherein can produce by power control unit 1000 conversion generator 1010, with equilibrium assignment to battery unit 1020 and brake units 1030, electric power system 100 is made to reach stable state.
Power control unit 1000 can comprise input 110, output 120, control unit 130 and switch element 140.In the present embodiment, input 110 in order to receive generator 1010 provide energy corresponding input voltage signal Vin and input current signal Iin.Output 120 is in order to transmit output voltage signal Vo and output current signal Io to battery unit 1020, and wherein the battery voltage signal Vb of battery unit 1020 is equal with output voltage signal Vo.
Control unit 130 electric property coupling input 110 and output 120, and in order to produce multiple switching signal according to input voltage signal Vin, input current signal Iin, output voltage signal Vo (also can be described as battery voltage signal Vb) and output current signal Io, one (such as: switching signal SW5) in switching signal, that the input current signal Iin that input 110 is received changes in order to the brake units 1030 of opening or closing and input 110 coupling.That is switching signal SW5 can, in order to open brake units 1030, to import the part electric current that generator 1010 produces, make the electric current flowing into input 110 reduce.
Switch element 140 electric property coupling input 110, output 120 and control unit 130, and in the switching signal produced by control unit 130 at least one control with regulation output voltage signal Vo.Such as, control unit 130 can by the switching action of adjustment first couple of switching signal SW1, SW3 and second pair of switching signal SW2, SW4 control switch unit 140, the voltage Vb (that is, output voltage signal Vo) of battery unit 1020 is made to reduce or increase.
It should be noted that, above-mentioned current signal Iin, Io and voltage signal Vin, Vo can be digital signal after treatment, directly be sent to control unit 130 and make further calculation process, also can be undressed analog signal, be sent to control unit 130 and deal with again after converting digital signal to, that is those skilled in the art can select form and the processing mode thereof of electric current and voltage signal according to actual demand.
Referring to Fig. 1 and Fig. 2.Fig. 2 is the circuit box schematic diagram of a kind of control unit 130 as shown in Figure 1 according to one embodiment of the present invention drafting.
In an embodiment disclosed by the invention, control unit 130 can comprise the first comparing module 200 and the first pi controller (Proportional Integral Controller, PIController) 210.First comparing module 200 in order to the input current instruction Iicom of comparison input current signal Iin and the corresponding maximum power output of input voltage signal Vin, to export the first difference.First pi controller 210 electric property coupling first comparing module 200, in order to receive the first difference, and makes calculation process with segmentation scales integral way (as shown in Fig. 8 A ~ Figure 10) to the first difference, exports to produce the first proportional integral.It should be noted that, above-mentioned generator 1010 has the voltage verses current curve (V-I Curve) of the maximum power output pre-set.In practical operation, be supplied to the input current signal Iin of input 110 and input voltage signal Vin by generator 1010 to may not be certain to be maximum power output, therefore control unit 130 can by the voltage verses current curve of the maximum power output of corresponding for input voltage signal Vin generator 1010, to obtain the electric current with maximum power output, by this as corresponding input current instruction Iicom.Then, control unit 130 can detect the actual input current signal Iin exporting to input 110 of generator 1010, and proportional integral computing is carried out to this input current signal Iin and input current instruction Iicom, and then back coupling control is carried out to generator 1010 rotating speed, make generator 1010 reach maximum power output.
In one embodiment of this invention, control unit 130 more can comprise the first judge module 220.First judge module 220 electric property coupling first pi controller 210, in order to judge whether input current signal Iin is greater than the maximum rated charging current value of battery unit 1020, make control unit 130 can produce according to the judged result of the first judge module 220 switching signal controlling brake units 1030.For example, when the input current signal Iin that generator 1010 provides is greater than the maximum rated charging current value of battery unit 1020, control unit 130 can produce switching signal SW5 according to the judged result of the first judge module 220, to open brake units 1030, and the excess energy produced by generator 1010 and electric current import among brake units 1030.It should be noted that, switching signal SW5 can be pulse-width modulation signal (Pulse Width Modulated Signal), in order to control the ON time of brake units 1030, to regulate the electric current flowing into input 110.Moreover, more can pass through the rotating speed that brake units 1030 back coupling controls generator 1010, make input current signal Iin and output current signal Io reach balance.
In one embodiment of this invention, control unit 130 more can comprise the second comparing module 230 and the second pi controller 240.The voltage instruction (also can be described as cell voltage instruction Vb-com) that second comparing module 230 is preset in order to comparison output voltage signal Vo and battery unit 1020, to export the second difference.Second pi controller 240 electric property coupling second comparing module 230, in order to receive the second difference, and makes calculation process with segmentation scales integral way to the second difference, exports to produce the second proportional integral.
In one embodiment of this invention, control unit 130 more can comprise the first selection module 250.First selects module 250 electric property coupling first judge module 220 and the second pi controller 240, wherein first select module 250 according to the comparative result of output voltage signal Vo and cell voltage instruction Vb-Vcom, optionally arrange the first proportional integral export or the second proportional integral to export be output current instruction Iocom.
Referring to Fig. 1 ~ Fig. 3.Fig. 3 is the time diagram of the charge mode according to battery unit in one embodiment of the present invention.
The following relevance that the first selection method of operation of module 250 and the charge mode with battery unit 1020 thereof are described with an embodiment.Control unit 130 can pass through comparison actual battery unit 1020 battery voltage signal Vb (that is, output voltage signal Vo) and target voltage 58V (that is, cell voltage instruction Vb-com) between difference, export to produce corresponding proportional integral.When battery unit 1020 has just started to charge, its voltage not yet charges to target voltage 58V, therefore have larger difference between battery voltage signal Vb and cell voltage instruction Vb-com, the numerical value that the second proportional integral making to obtain after the second pi controller 240 computing exports may very large.Therefore, first select module 250 that first proportional integral output is configured to output current instruction Iocom, to limit the higher limit of output current instruction Iocom.Power control unit 1000 is made to carry out large current charge with output current signal Io (such as: 22A) fixing haply to battery unit 1020, constant current mode (Constant Current Mode, CC Mode) as shown in Figure 3.
When battery unit 1020 is about to fill full, its voltage has charged to target voltage 58V, therefore have less difference between battery voltage signal Vb and cell voltage instruction Vb-com, the numerical value that the second proportional integral making to obtain after the second pi controller 240 computing exports may very little.Therefore, first selects module 250 to be exported by second proportional integral is configured to output current instruction Iocom, power control unit 1000 is made to carry out trickle charge with output voltage signal Vo fixing haply to battery unit 1020, constant voltage mode (Constant Voltage Mode, CVMode) as shown in Figure 3.Now, along with battery unit 1020 fills full gradually, charging current also with minimizing.
In one embodiment of this invention, control unit 130 more can comprise the 3rd comparing module 260, the 3rd pi controller 270 and the second judge module 280.3rd comparing module 260 in order to comparison output current signal Io and output current instruction Iocom, to export the 3rd difference.3rd pi controller 270 electric property coupling the 3rd comparing module 260, in order to receive the 3rd difference, and makes calculation process with segmentation scales integral way to the 3rd difference, exports to produce the 3rd proportional integral.Second judge module 280 electric property coupling the 3rd pi controller 270, and the first couple of switching signal SW1 determined in control unit 130 output switching signal is exported according to the 3rd proportional integral, SW3 and second couple switching signal SW2, SW4, and control unit 130 exports adjustment first couple of switching signal SW1, SW3 and second couple of switching signal SW2, SW4 according to the 3rd proportional integral, switch element 140 is made to perform corresponding switching action, with regulation output voltage signal Vo.
For example, the 3rd proportional integral that control unit 130 can produce according to the comparison result of output current instruction Iocom and output current signal Io exports, to adjust first couple of switching signal SW1, SW3 and second couple switching signal SW2, the pulse bandwidth of SW4, and then the ON time of corresponding multiple switch in control switch unit 140, with regulation output voltage signal Vo, thus reduce or increase the voltage of battery unit 1020.
In addition, whether the more exportable switching signal SW6 of control unit 130 is connected with load unit 1040 with control output end 120.
It should be noted that, the comparing module among control unit 130, pi controller, judge module and selection module can be realized by software, hardware or combinations thereof mode, and be not limited with above-described embodiment.
Please refer to Fig. 4.Fig. 4 is the circuit box schematic diagram of the electric power system 400 according to one embodiment of the present invention.Electric power system 400 can comprise power input end 410, power output end 420, brake switch 430, control unit 440 and switch element 450.
Power input end 410 in order to receive generator 4010 provide energy corresponding input voltage signal Vin and input current signal Iin.In addition, between generator 4010 and power input end 410, more can comprise rectification unit 4020, carry out rectification and filtering in order to the three-phase ac signal exported generator 4010, to be supplied to power input end 410.Power output end 420 is in order to transmit output voltage signal Vo and output current signal Io to battery unit 4030.
Brake switch 430 electric property coupling power input end 410, in order to regulate input current signal Iin.Control unit 440 electric property coupling power input end 410 and power output end 420, and in order to produce multiple switching signal according to input voltage signal Vin, input current signal Iin, output voltage signal Vo (also can be described as battery voltage signal Vb) and output current signal Io, one in switching signal is that the input current signal Iin that power input end 410 is received changes in order to open or to close brake switch 430.For example, when generator 4010 rotating speed is too fast and when producing excessive power and electric current, control unit 440 can produce switching signal SW5, and to open brake switch 430, the excess energy making generator 4010 produce and electric current import among brake resistor 4040.Moreover, more can pass through the configuration of brake resistor 4040, to feedback the rotating speed of control mode regulator generator 4010, make input current signal Iin and output current signal Io reach balance.
Switch element 450 electric property coupling power input end 410, power output end 420 and control unit 440, and in the switching signal produced by control unit 440 at least one control with regulation output voltage signal Vo.Such as, control unit 440 can by adjustment first couple of switching signal SW1, SW3 and second couple switching signal SW2, the switching action of multiple switch (such as: the first switch the 451 ~ four switch 454) in SW4 control switch unit 450, the battery voltage signal Vb (that is, output voltage signal Vo) of battery unit 4030 is made to reduce or increase.
In one embodiment of this invention, control unit 440 is compared and segmentation scales integral operation (as shown in Fig. 8 A ~ Figure 10) to input voltage signal Vin, input current signal Iin, output voltage signal Vo, output current signal Io, cell voltage instruction Vb-com and current-order, with output switching signal.Such as, control unit 440 can receive the input voltage signal Vin after Analog-digital Converter, input current signal Iin, output voltage signal Vo and output current signal Io, and then compare and segmentation scales integral operation with corresponding voltage and current-order, control the switching signal SW5 of the brake switch 430 and switching signal SW1 ~ SW4 of control switch unit 450 to export.
In an embodiment of this disclosure, switch element 450 can comprise the first switch 451, second switch 452, the 3rd switch 453, the 4th switch 454 and inductance 455.First switch 451 electric property coupling control unit 440 and power input end 410.Second switch 452 electric property coupling control unit 440 and power output end 420.3rd switch 453 electric property coupling controls single 440, first switch 451 and earth terminal 460.4th switch 454 electric property coupling control unit 440, second switch 452 and earth terminal 460.Between inductance 455 electric property coupling first switch 451, second switch 452, the 3rd switch 453 and the 4th switch 454, wherein the first switch 451, second switch 452, the 3rd switch 453, the 4th switch 454 form H type electric bridge with inductance 455.
Referring to Fig. 4 and Fig. 5.Fig. 5 is the sequencing control schematic diagram of the decompression mode according to electric power system in one embodiment of the present invention.
In one embodiment of this invention, control unit 440 is through couple switching signal SW1 of first in switching signal, SW3 controls the ON time of the first switch 451 and the 3rd switch 453, to reduce output voltage signal Vo (that is, reduce the battery voltage signal Vb of battery unit 4030) through H type electric bridge.
In one embodiment of this invention, first couple of switching signal SW1, SW3 are complementary pulse-width modulation signal.That is, be complementary between switching signal SW1 and switching signal SW3.
Referring to Fig. 4 and Fig. 6.Fig. 6 is the sequencing control schematic diagram of the boost mode according to electric power system in one embodiment of the present invention.
In one embodiment of this invention, control unit 440 is through couple switching signal SW2 of second in switching signal, SW4 controls the ON time of second switch 452 and the 4th switch 454, to increase output voltage signal Vo (that is, increase the battery voltage signal Vb of battery unit 4030) through H type electric bridge.
In one embodiment of this invention, second couple of switching signal SW2, SW4 are complementary pulse-width modulation signal.That is, be complementary between switching signal SW2 and switching signal SW4.
It should be noted that, above-mentioned switching signal SW1 ~ switching signal SW4 can change its signal pattern according to practical operation demand, and is not limited with above-described embodiment.
In one embodiment of this invention, another in the more exportable switching signal of control unit 440, to open or to close the load switch 4050 coupled with power output end 420.For example, the exportable switching signal SW6 of control unit 440, to open or to close load switch 4050.When load switch 4050 is opened, power output end 420 can couple with load device 4060.When load switch 4050 cuts out, power output end 420 and load device 4060 are isolated.So, in this electric power system 400, can by under the control of switching signal SW6, to determine whether power output end 420 connects load device 4060.
Referring to Fig. 1 and Fig. 7.Fig. 7 is the flow chart of steps of the electrical control method according to one embodiment of the present invention.Above-mentioned electrical control method can be applicable in the electric power system 100 shown in Fig. 1, and using the steps flow chart of the following example as explanation.First in step 720, control unit 130 can obtain generator 1010 provide energy corresponding input voltage signal Vin and input current signal Iin.In a step 715, control unit 130 can carry out the first proportional integral computing according to the input current instruction Iicom of input current signal Iin and the corresponding maximum power output of input voltage signal Vin.
The input current instruction Iicom of comparison input current signal Iin and the corresponding maximum power output of input voltage signal Vin more can be comprised in above-mentioned steps 715, to export the first difference, then utilize segmentation scales integral way (as shown in Fig. 8 A ~ Figure 10) to make calculation process to the first difference, export to produce the first proportional integral.
In step 720, control unit 130 can judge whether input current signal Iin is greater than the maximum rated charging current value of battery unit 1020.In step 725, if when input current signal Iin is greater than the maximum rated charging current value of battery unit 1020, control unit 130 produces the switching signal (such as: switching signal SW5) controlling brake units 1030, and input current signal Iin is reduced.
Then, in step 730, control unit 130 can obtain the output voltage signal Vo (that is, the battery voltage signal Vb of battery unit 1020) of output 120.In step 735, the cell voltage instruction Vb-com that control unit 130 can be preset according to output voltage signal Vo and battery unit 1020, to carry out the second proportional integral computing.
The cell voltage instruction Vb-com that comparison output voltage signal Vo and battery unit 1020 are preset more can be comprised in above-mentioned steps 735, to export the second difference, then utilize segmentation scales integral way to make calculation process to the second difference, export to produce the second proportional integral.
In step 740, control unit 130 can comparison output voltage signal Vo and cell voltage instruction Vb-com, make control unit 130 can according to the comparison result of output voltage signal Vo and cell voltage instruction Vb-com, the first proportional integral computing is optionally set or the second proportional integral operation result is output current instruction Iocom.For example, when output voltage signal Vo is less than cell voltage instruction Vb-com, first proportional integral operation result is set to output current instruction Iocom, as shown in step 750, battery unit 1020 is charged according to output current signal Io fixing haply, that is, constant-current charge is done, as shown in step 755 to battery unit 1020.When output voltage signal Vo equals cell voltage instruction Vb-com, second proportional integral operation result is set to output current instruction Iocom, as shown in step 760, battery unit 1020 is charged according to output voltage signal Vo fixing haply, that is, constant-voltage charge is done, as shown in step 765 to battery unit 1020.
Then, in step 770, control unit 130 can obtain the output current signal Io of output 120.It should be noted that, if when output 120 does not connect load unit 1040, output current signal Io is the charging current of battery unit 1020.If when output 120 connects load unit 1040, then output current signal Io is the charging current of battery unit 1020 and the summation of load unit 1040 electric current.In step 775, control unit 130 can carry out the 3rd proportional integral computing according to output current signal Io and output current instruction Iocom, comprise comparison output current signal Io and output current instruction Iocom, to export the 3rd difference, then segmentation scales integral way is utilized to make calculation process to the 3rd difference, export to produce the 3rd proportional integral, make control unit 130 can adjust first couple of switching signal SW1 according to the 3rd proportional integral operation result, SW3 and second couple switching signal SW2, SW4, switch element 140 is made to perform corresponding switching action, with regulation output voltage signal Vo (that is, battery voltage signal Vb).The operating principle of electrical control method in the present embodiment and flow process are same or similar with the electric power system shown in Fig. 1 and Fig. 4, repeat no more in this.
In one embodiment of this invention, control unit 130 adjustable first couple of switching signal SW1, the pulse bandwidth of SW3, as shown in Figure 5, carry out corresponding switching action with control switch unit 140 and enter decompression mode, the voltage of battery unit 1020 is made to reduce (that is, reduce output voltage signal Vo), as shown in step 780.In addition, control unit 130 also can control second couple of switching signal SW2, the pulse bandwidth of SW4, as shown in Figure 6, carry out corresponding switching action with control switch unit 140 and enter boost mode, the voltage of battery unit 1020 is made to increase (that is, increase output voltage signal Vo), as shown in step 790.
It should be noted that, above-mentioned first couple of switching signal SW1, SW3 and second couple of switching signal SW2, SW4 can be complementary pulse-width modulation signal.That is switching signal SW1 and switching signal SW3 is complementary, switching signal SW2 and switching signal SW4 is complementary.In addition, above-mentioned switching signal SW1 ~ switching signal SW4 can change its signal pattern according to practical operation demand, and is not limited with above-described embodiment.
Moreover above-mentioned electrical control method more can comprise another (such as: switching signal SW6) in output switching signal with the unlatching of control load unit 1040 or closedown.When load unit 1040 is for opening, load unit 1040 can couple with output 120.When load unit 1040 is for closing, load unit 1040 and output 120 are isolated.Therefore, under can pass through the control of the switching signal SW6 of control unit 130, to determine whether output 120 connects load unit 1040.
Following is the operating principle that segmentation scales integral way is described with an embodiment.Please refer to Fig. 8 A ~ Figure 10.Fig. 8 A and Fig. 8 B is Error Gain parameter according to the proportional integral mode of one embodiment of the present invention and segmentation error gain parameter schematic diagram.Fig. 9 A and Fig. 9 B is storage gain parameter according to the proportional integral mode of one embodiment of the present invention and subsection integral gain parameter schematic diagram.Figure 10 is the sequencing control schematic diagram exported according to the transfer function of the proportion of utilization integral way of one embodiment of the present invention.
In one embodiment of this invention, the first proportional integral computing, the second proportional integral computing and the 3rd proportional integral computing the Error Gain non-parametric segmentation shown in Fig. 8 A are become multiple piecewise interval t1 ~ t6, segmentation error gain parameter as shown in Figure 8 B.Meanwhile, the storage gain non-parametric segmentation shown in Fig. 9 A can be become multiple piecewise interval x1 ~ x6, subsection integral gain parameter as shown in Figure 9 B.Therefore, which piecewise interval control unit 130 can determine to operate according to the energy adjusting situation of generator 1010, battery unit 1020 and brake units 1030, with the numerical value of quick error in judgement gain and storage gain.Then, the numerical value according to Error Gain and storage gain produces multiple switching signal, to control the switching action of corresponding switch, makes the energy between generator 1010, battery unit 1020 and brake units 1030 and electric current obtain equilibrium assignment.From above-mentioned graphic example, control unit 130 can under the operation of segmentation scales integral way, proportional integral computing is carried out with the numerical value of less Error Gain and storage gain, and then accelerate the time of calculation process, make between generator 1010, battery unit 1020 and brake units 1030, to reach the stable state that transfer function output is 1 fast, as shown in Figure 10.
Compared to the known practice, stating on the invention in embodiment is the electrical control method adopting nonlinear proportional plus integral control, and the opening time of corresponding switch is controlled through the pulse wave modulating signal of numeral, the energy produced with equilibrium assignment wind-driven generator is to battery unit and brake units.Moreover, be simplified to multiple piecewise interval by by Error Gain function and integral gain function, to accelerate the convergence situation that transfer function exports, make wind-driven generator, between battery unit and brake units, reach the stable state of energy, voltage and electric current fast.
Although the present invention with execution mode openly as above; so itself and be not used to limit the present invention; the above-mentioned operator of any skilled grasp; without departing from the spirit and scope of the present invention; when doing various variations and adjustment, therefore protection scope of the present invention is when being as the criterion depending on the accompanying application claims person of defining.
Claims (23)
1. a power control unit, comprises:
One input, in order to receive a generator provide energy corresponding an input voltage signal and an input current signal;
One output, in order to transmit an output voltage signal and an output current signal to a battery unit;
One control unit, this input of electric property coupling and this output, and in order to produce one first switching signal when judging that this input current signal is greater than the maximum rated charging current value of this battery unit, and produce multiple second switch signal according to this input voltage signal, this input current signal, this output voltage signal and this output current signal, this first switching signal is that this input current signal that this input is received changes in order to a brake units of opening or closing and this input coupling; And
One switch element, this input of electric property coupling, this output and this control unit, and in those second switch signals produced by this control unit, at least one is controlled to regulate this output voltage signal.
2. power control unit as claimed in claim 1, wherein this control unit comprises:
One first comparing module, in order to an input current instruction of this input current signal of comparison and the corresponding maximum power output of this input voltage signal, to export one first difference; And
One first pi controller, this first comparing module of electric property coupling, in order to receive this first difference, and makes calculation process with a segmentation scales integral way to this first difference, exports to produce one first proportional integral.
3. power control unit as claimed in claim 2, wherein this control unit more comprises:
One first judge module, this first pi controller of electric property coupling, in order to judge whether this input current signal is greater than the maximum rated charging current value of this battery unit, this control unit is made to produce according to the judged result of this first judge module this first switching signal controlling this brake units.
4. power control unit as claimed in claim 3, wherein this control unit more comprises:
One second comparing module, the voltage instruction preset in order to this output voltage signal of comparison and this battery unit, to export one second difference; And
One second pi controller, this second comparing module of electric property coupling, in order to receive this second difference, and makes calculation process with this segmentation scales integral way to this second difference, exports to produce one second proportional integral.
5. power control unit as claimed in claim 4, wherein this control unit more comprises:
One first selects module, this first judge module of electric property coupling and this second pi controller, wherein this first select module according to the comparative result of this output voltage signal and this voltage instruction optionally arrange this first proportional integral export or this second proportional integral to export be an output current instruction.
6. power control unit as claimed in claim 5, wherein this control unit more comprises:
One the 3rd comparing module, in order to this output current signal of comparison and this output current instruction, to export one the 3rd difference;
One the 3rd pi controller, electric property coupling the 3rd comparing module, in order to receive the 3rd difference, and makes calculation process with this segmentation scales integral way to the 3rd difference, exports to produce one the 3rd proportional integral; And
One second judge module, electric property coupling the 3rd pi controller, and export according to the 3rd proportional integral and determine that this control unit exports one first pair of second switch signal in those switching signals and one second pair of second switch signal, and this control unit exports this first pair of second switch signal of adjustment and this second pair of second switch signal according to the 3rd proportional integral, this switch element is made to perform corresponding switching action, to regulate this output voltage signal.
7. power control unit as claimed in claim 5, wherein when this this first proportional integral of the first selection module installation exports as this output current instruction, this power control unit charges to this battery unit with this fixing haply output current signal, when this this second proportional integral of the first selection module installation exports as this output current instruction, this power control unit charges to this battery unit with this fixing haply output voltage signal.
8. an electric power system, comprises:
One power input end, in order to receive a generator provide energy corresponding an input voltage signal and an input current signal;
One power output end, in order to transmit an output voltage signal and an output current signal to a battery unit;
One brake switch, this power input end of electric property coupling, in order to regulate this input current signal;
One control unit, this power input end of electric property coupling and this power output end, and in order to produce one first switching signal when judging that this input current signal is greater than the maximum rated charging current value of this battery unit, and produce multiple second switch signal according to this input voltage signal, this input current signal, this output voltage signal and this output current signal, this first switching signal is in order to open or to close this brake switch, this input current signal change that this power input end is received; And
One switch element, this power input end of electric property coupling, this power output end and this control unit, and in those second switch signals produced by this control unit, at least one is controlled to regulate this output voltage signal.
9. electric power system as claimed in claim 8, wherein this control unit is compared and segmentation scales integral operation to this input voltage signal, this input current signal, this output voltage signal, this output current signal, voltage instruction and current-order, to export this first switching signal and those second switch signals.
10. electric power system as claimed in claim 8, wherein this switch element comprises:
One first switch, this control unit of electric property coupling and this power input end;
One second switch, this control unit of electric property coupling and this power output end;
One the 3rd switch, this control unit of electric property coupling, this first switch and earth terminal;
One the 4th switch, this control unit of electric property coupling, this second switch and earth terminal; And
One inductance, between this first switch of electric property coupling, this second switch, the 3rd switch and the 4th switch, this first switch, this second switch, the 3rd switch, the 4th switch and this inductance form H type electric bridge.
11. electric power systems as claimed in claim 10, wherein this control unit is through the ON time of this first switch of pair second switch signal controlling of one first in those second switch signals and the 3rd switch, to reduce this output voltage signal.
12. electric power systems as claimed in claim 11, wherein this first pair of second switch signal is complementary pulse-width modulation signal.
13. electric power systems as claimed in claim 10, wherein this control unit is through the ON time of pair this second switch of second switch signal controlling of one second in those second switch signals and the 4th switch, to increase this output voltage signal.
14. electric power systems as claimed in claim 13, wherein this second pair of second switch signal is complementary pulse-width modulation signal.
15. electric power systems as claimed in claim 8, wherein this control unit more exportable the 3rd signal, to open or to close the load switch coupled with this power output end.
16. 1 kinds of electrical control methods, comprise:
According to a generator provide energy corresponding an input current signal and an input current instruction of the corresponding maximum power output of an input voltage signal carry out one first proportional integral computing;
Judge whether this input current signal is greater than the maximum rated charging current value of a battery unit;
When this input current signal is greater than the maximum rated charging current value of this battery unit, produce a switching signal of control one brake units;
The voltage instruction preset according to an output voltage signal and this battery unit carries out one second proportional integral computing;
This output voltage signal of comparison and this voltage instruction;
Comparison result according to this output voltage signal and this voltage instruction optionally arranges this first proportional integral computing or this second proportional integral operation result is an output current instruction;
One the 3rd proportional integral computing is carried out according to an output current signal and this output current instruction; And
Adjust one first pair of switching signal and one second pair of switching signal according to the 3rd proportional integral operation result, make a switch element perform corresponding switching action, to regulate this output voltage signal.
17. electrical control methods as claimed in claim 16, wherein this first proportional integral computing, this second proportional integral computing and the 3rd proportional integral computing are that an Error Gain function and an integral gain function are divided into multiple piecewise interval, the yield value making a control unit corresponding to those piecewise intervals carries out calculation process, and under the operation of a segmentation scales integral way, accelerate the time of calculation process.
18. electrical control methods as claimed in claim 17, the step of wherein carrying out this first proportional integral computing more comprises:
This input current instruction of this input current signal of comparison and the corresponding maximum power output of this input voltage signal, to export one first difference; And
Utilize this segmentation scales integral way to make calculation process to this first difference, export to produce one first proportional integral.
19. electrical control methods as claimed in claim 17, the step of wherein carrying out this second proportional integral computing more comprises:
This voltage instruction that this output voltage signal of comparison and this battery unit are preset, to export one second difference; And
Utilize this segmentation scales integral way to make calculation process to this second difference, export to produce one second proportional integral.
20. electrical control methods as claimed in claim 17, the step of wherein carrying out the 3rd proportional integral computing more comprises:
This output current signal of comparison and this output current instruction, to export one the 3rd difference; And
Utilize this segmentation scales integral way to make calculation process to the 3rd difference, export to produce one the 3rd proportional integral.
21. electrical control methods as claimed in claim 16, wherein when this output voltage signal is less than this voltage instruction, this the first proportional integral operation result is set to this output current instruction, this battery unit is charged according to this fixing haply output current signal, when this output voltage signal equals this voltage instruction, this the second proportional integral operation result is set to this output current instruction, and this battery unit is charged according to this fixing haply output voltage signal.
22. electrical control methods as claimed in claim 16, wherein this first pair of switching signal and this second pair of switching signal are complementary pulse-width modulation signal.
23. electrical control methods as claimed in claim 16, more comprise:
Export in those switching signals another, to control unlatching or the closedown of a load unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101015112A (en) * | 2004-08-13 | 2007-08-08 | 皇家飞利浦电子股份有限公司 | DC-DC converter with adaptive switching parameter adjustment |
| CN101702532A (en) * | 2009-11-26 | 2010-05-05 | 芜湖国睿兆伏电子股份有限公司 | Charge controller of wind turbine generator and control method thereof |
| CN101814763A (en) * | 2010-04-15 | 2010-08-25 | 冬雷 | Small conversion device for use in wind power generation |
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| US20070223258A1 (en) * | 2003-11-25 | 2007-09-27 | Jih-Sheng Lai | Multilevel converters for intelligent high-voltage transformers |
| US8030791B2 (en) * | 2008-07-31 | 2011-10-04 | Rockwell Automation Technologies, Inc. | Current source converter-based wind energy system |
| US8279642B2 (en) * | 2009-07-31 | 2012-10-02 | Solarbridge Technologies, Inc. | Apparatus for converting direct current to alternating current using an active filter to reduce double-frequency ripple power of bus waveform |
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| CN101015112A (en) * | 2004-08-13 | 2007-08-08 | 皇家飞利浦电子股份有限公司 | DC-DC converter with adaptive switching parameter adjustment |
| CN101702532A (en) * | 2009-11-26 | 2010-05-05 | 芜湖国睿兆伏电子股份有限公司 | Charge controller of wind turbine generator and control method thereof |
| CN101814763A (en) * | 2010-04-15 | 2010-08-25 | 冬雷 | Small conversion device for use in wind power generation |
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