CN101252290B - Wind electricity change paddle UPS system based on super capacitor - Google Patents
Wind electricity change paddle UPS system based on super capacitor Download PDFInfo
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- CN101252290B CN101252290B CN 200810024657 CN200810024657A CN101252290B CN 101252290 B CN101252290 B CN 101252290B CN 200810024657 CN200810024657 CN 200810024657 CN 200810024657 A CN200810024657 A CN 200810024657A CN 101252290 B CN101252290 B CN 101252290B
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Abstract
The invention discloses a wind-electricity variable pitch UPS system based on super-capacitors and the control method thereof. The UPS system comprises a super-capacitor group(10), a charge and discharge circuit(20), a control circuit(30) and a contactor(50). The super-capacitor group(10) is connected with the charge and discharge circuit(20) which is in connection with a DC generatrix(40)throughthe contactor(50); the control circuit(30), connected with the charge and discharge circuit(20), controls the operation of the charge and discharge circuit(20), and the whole system is connected or not with the DC generatrix(40) through the control of the contactor(50). The UPS system makes use of the control circuit(30) to control energy to flow in two ways between the super-capacitor group(10) and the DC generatrix(40), thus realizing continuous power supply. The UPS system is based on a simple principle and is flexible in structure; meanwhile, the high efficient charge and discharge control strategy can improve energy utilization ratio of the super-capacitor group and reduce installation content and cost of the system, thus greatly improving the technical performance and economic performance of the system.
Description
Technical field
The present invention relates to uninterrupted power supply (ups) Unity and control method thereof that a kind of wind electricity change paddle is used, especially uninterrupted power supply and the control method thereof formed by ultracapacitor used in a kind of wind electricity change paddle, specifically a kind of wind electricity change paddle UPS system and control method thereof based on ultracapacitor.
Background technology
As everyone knows, the modern wind generator techniques not only requires to utilize wind energy to greatest extent, raises the efficiency, and requires to strengthen the security performance of whole blower fan.Pitch-variable system because of it can improve capturing wind energy efficient under rated wind speed, obtains optimum capacity output, thereby has occupied the leading position of wind-driven generator gradually, has particularly obtained increasing application in large fan.Pitch-variable system also must protect blower fan not to be damaged by the control blade under the too fast situation of wind speed; therefore pitch-variable system is the key that guarantees whole blower fan fail safe; safe and stable operation for itself has very high requirement; must dispose a cover ups system has a power failure or takes place to interrupt or when falling at line voltage guaranteeing; pitch-variable system can also normally move, in case the too fast situation of wind speed occurs here the time and damage whole blower fan.
In the generating pitch-variable system, in case that the major function of ups system is a line voltage is undesired, start immediately to the pitch-variable system power supply, the control blade forwards safe position to, so wind electricity change paddle UPS system has very high requirement for energy-storage units.At first, the operational environment difference of wind power plant itself is very big, requires the energy-storage units of wind electricity change paddle UPS system to have very strong adaptive capacity to environment, no matter can both operate as normal under what condition of work.Secondly, ups system mainly is to play a part emergency service, and power-on time is not very long, but very big to the demand of power, and this just requires energy-storage units to have high-power in short-term handling capacity.The 3rd, because the increasing typeization of modern blower fan and complicated, to the maintenance of blower fan and the replacing of part also is more and more difficult, therefore need ups system to have very long useful life, and after long-time the use, can keep performance constant substantially, and this wherein topmost be exactly the energy-storage units of UPS.
In present ups system, chargeable storage is the very general energy storage device of a kind of application.As lead acid accumulator, nickel cadmium cell, nickel-hydrogen accumulator etc.Batteries to store energy has characteristics such as energy density height, with low cost, abundant raw materials, manufacturing technology maturation, can realize large-scale production.But, adopt chargeable storage to have certain weak point as the energy-storage units of UPS, can't satisfy the requirement of wind electricity change paddle UPS system well to energy-storage units.At first, chemical reaction can take place in storage battery in the course of the work, causes the expansion and the contraction of electrode structure, causes the accumulator property decay.Because the energy-storage units in the wind electricity change paddle UPS system will constantly absorb and release energy, particularly for uninterruptedly also will often carrying out the degree of depth apart from the power supply of system, the assurance wind electricity change paddle discharges and recharges in the insecure area of mains supply, cause the storage battery shortening in useful life, need often to change, increased the cost of system.Secondly, the power density of storage battery is less, in this high-power applications occasion of wind electricity change paddle apart from system, the very big batteries of configuration capacity, has increased the cost of system, has reduced economy.In addition, the energy management process of storage battery is very complicated, and its efficiency for charge-discharge is lower, need often safeguard or change, and the difficult processing of the metal material after using, can cause environmental pollution.Using storage battery as energy-storage units at wind electricity change paddle in ups system, is not very suitable from technical performance and economic performance analysis.
Ultracapacitor is a kind of novel electric power energy storage device that occurs in recent years, and its memory capacity is than the big several magnitude of ordinary capacitor.It is by using a kind of porous electrolyte (its dielectric constant and voltage ability to bear are still lower) to strengthen the area of two-plate, thereby energy storage capacity is improved.Ultracapacitor comprises double electric layer capacitor (Electric Double Layer Capacitor) and electrochemical capacitor (Electrochemical Capacitor).Double electric layer capacitor is called the symmetric form capacitor again, and its two electrodes all adopt the activated carbon of high-specific surface area, and works based on the generation of the separation of charge on carbon electrode and electrolyte interface electric double layer capacitance.Electrochemical capacitor claims the asymmetrical type capacitor again, and its utmost point also is to adopt activated carbon as electrode, and another utmost point adopts RuO
2Make electrode Deng metal oxide containing precious metals or electroconductive polymer polymer, redox reaction takes place in oxide or polymer electrode surface and body and produce adsorption capacitance, be called pseudo capacitance again.Because the mechanism of production of pseudo capacitance is similar to battery, under the situation of identical electrodes area, its capacitance is several times of electric double layer capacitance; But the power characteristic of double electric layer capacitor transient large current discharge is better than Faradic electricity container.
Ultracapacitor has the big advantage of conventional capacitor power density, can discharge and recharge fast and efficiently, and long service life, be difficult for aging.In addition, in use it neither needs cooling device also not need heater.Ultracapacitor can discharge safely, installs simple and easyly, and compact conformation can adapt to various environment, have also that high temperature performance is good, energy judge simple accurately, plurality of advantages such as Maintenance free and environmental friendliness.These advantages of ultracapacitor make it be fit to very much to replace storage battery becomes the energy-storage units of wind electricity change paddle apart from ups system.
Canadian Patent CA2557084 has introduced a kind of backup power system that is used for the wind electricity change paddle distance, has wherein used storage battery as its energy-storage travelling wave tube.U.S. Pat 673762 has been introduced device and the control method thereof that ultracapacitor is used for uninterrupted power supply, utilize the fast response characteristic of ultracapacitor, before generator unit (for example fuel cell) reaches the demand of load, utilize ultracapacitor to come the balanced load demand.At present, had the relevant patent of supercapacitor applications in wind generator system, as patent CN1966975 introduced a kind of with ultracapacitor as energy-storage system, be used for wind generator system, provide big power to support to load.But the relevant report that the ups system that ultracapacitor is used as wind electricity change paddle is not arranged at present according to the knowledge of the applicant, as yet.
Summary of the invention
The objective of the invention is little, a series of problems such as the time that discharges and recharges is long, the life-span is short, maintenance is big, use cost height of power density at the existence of existing storage battery formula wind electricity change paddle UPS system, design a kind ofly can discharge and recharge fast and efficiently, long service life, be difficult for aging wind electricity change paddle UPS system, a kind of control method of this system is provided simultaneously based on ultracapacitor.
Technical scheme of the present invention is:
A kind of wind electricity change paddle UPS system based on ultracapacitor, comprise ultracapacitor 10, charge-discharge circuit 20, contactor 50 and control circuit 30, the input that it is characterized in that the output termination charge-discharge circuit 20 of described ultracapacitor 10, the output termination dc bus 40 of charge-discharge circuit 20, contactor 50 is serially connected on the output line of dc bus 40, the control input end of output connection control circuit 30 correspondences of the transducer 80 that charge-discharge circuit 20 is embedded, a control output end of control circuit 30 connects the control input end of charge-discharge circuit 20, and another control output end of control circuit 30 connects the control end of contactor 50.
Described control circuit 30 also is connected with voltage and current signal transducer 60,70, and the input of voltage and current signal transducer 60 links to each other with ultra-capacitor 10, and the input of voltage and current signal transducer 60 links to each other with dc bus 40.
Described ultracapacitor 10 or be monomer structure, or be the bank of super capacitors of forming by the connection in series-parallel of monomer ultracapacitor.
Described control circuit 30 comprises signal sampling unit 31, A/D converting unit 32, user instruction unit 33, calculation control unit 34 and isolation drive unit 35, wherein be responsible for the acquisition system parameter, the output of the signal sampling unit 31 of output voltage signal links to each other with A/D converting unit 32 corresponding input end, the output of A/D converting unit 32 links to each other with calculation control unit 34, the output of user instruction unit 33 also links to each other with calculation control unit 34 corresponding input end, and the control signal output ends of calculation control unit 34 links to each other with isolation drive unit 35 corresponding input end.
Described charge-discharge circuit 20 is made up of two-way Buck-Boot circuit 120, and it comprises controlled power switching tube 23,25, power diode 24,26, inductance 22, filter capacitor 21,27, and the 22a end of inductance 22 is connected with the anode 100a of port one 00; The 22b end of inductance 22 is connected with the negative electrode 24a end of the 23a end of power switch pipe 23 and power diode 24, and the 23b end of power switch pipe 23 is connected with the anode 24b of diode 24, and is connected with the negative terminal 100b of port one 00 and the negative terminal 29b of port 29; The 22b end of inductance 22 is connected with the anode 26a end of the 25a end of power switch pipe 25 and power diode 26, and the 25b end of power switch pipe 25 is connected with the negative electrode 26b of diode 26, and is connected with the anode 29a of port 29; Filter capacitor 21 is connected in parallel with port one 00, and filter capacitor 27 is connected in parallel with port 29.
Described charge-discharge circuit 20 is composed in parallel by unidirectional Buck and unidirectional Boost circuit 121, and it comprises controlled power switching tube 203,207, power diode 204,206, inductance 202,205, filter capacitor 201,208, and the 202a end of inductance 202 is connected with the anode 100a of port one 00; The 202b end of inductance 202 is connected with the anode 204a end of the 203a end of power switch pipe 203 and power diode 204; The negative electrode 204b end of power diode 204 is connected with the anode 100a of port one 00; The 203b end of power switch pipe 203 is connected with the negative terminal 100b of port one 00 and the negative terminal 209b of port 209; The 205a end of inductance 205 is connected with the anode 100a of port one 00; The 205b end of inductance 205 is connected with the negative electrode 204a end of the 207a end of power switch pipe 207 and power diode 206; The 207b end of power switch pipe 207 is connected with the anode 209a of port 209; The anode 206b end of power diode 206 is connected with the negative terminal 100b of port one 00 and the negative terminal 209b of port 209; Filter capacitor 201 is connected in parallel with port one 00, and filter capacitor 208 is connected in parallel with port 209.
A kind of control method of the wind electricity change paddle UPS system based on ultracapacitor, it is characterized in that: signal sampling unit 31 sampling dc buss, 40 terminal voltages in the control circuit 30, the voltage of bank of super capacitors 10 and charge and discharge electric current, output voltage signal is given A/D converting unit 32, and A/D converting unit 32 is given calculation control unit 34 with the digital signal of conversion; Calculation control unit 34 is given with user instruction in user instruction unit 33, calculation control unit 34 through isolation drive unit 35, drives the power switch pipe 203 in the ultracapacitor charge-discharge circuit 20 according to the control procedure output control signal of setting, 207, realize control procedure; After the start, whether Control Software at first judges dc bus 40 terminal voltages greater than bank of super capacitors 10 voltages, if greater than bank of super capacitors 10 voltages, and then closed contactor 50; Judge that then whether dc bus 40 terminal voltages reach set point, if less than set point, then enter discharge procedures, control controlled power switching tube 25 is not worked, drive controlled power switching tube 23, perhaps control controlled power switching tube 207 and do not work, drive controlled power switching tube 203; Otherwise, entering charging procedure, control controlled power switching tube 23 is not worked, and drives controlled power switching tube 25, perhaps controls controlled power switching tube 203 and does not work, and drives controlled power switching tube 207; In charging procedure, software judges whether bank of super capacitors 10 voltages reach the maximum V0 of setting, if reach, then stops charging; Then whether software judges bank of super capacitors 10 voltages less than set point V1, if less than, then bank of super capacitors 10 is charged, and adopt large current charge; At last, software judges that bank of super capacitors 10 voltages are whether between set point V2 and V3, if then changing charged state is low current charge.
Beneficial effect of the present invention:
(1) adopts ultracapacitor energy storage, can give full play to that its power density is big, the speed that discharges and recharges is fast, have extended cycle life and advantage that energy storage efficiency is high, make energy storage device have good technical performance.
(2) because the unsteady flow control action of charge-discharge circuit, the terminal voltage of bank of super capacitors and DC bus-bar voltage can be very different, and are satisfying under the prerequisite of same power demand, and the capacity usage ratio of ultracapacitor greatly improves, reduce installed capacity, reduced system cost.
(3) bank of super capacitors is only carried out energy exchange by one-level DC/DC power inverter and dc bus, has reduced energy loss, has improved energy storage efficiency.
(4) the two-way DC/DC charge-discharge circuit of non-isolation type has multiple design, both can adopt two-way BUCK-BOOST circuit, also can adopt the mode of unidirectional BUCK and the parallel connection of BOOST circuit, and its design principle is simple, and structure is flexible.
(5) this device uses simply, and the user only need be connected on device on the dc bus, and handles the open and close button and just can control the operation of whole device and stop, and the concrete course of work is all realized by software control.
This device adopts ultracapacitor as energy-storage units, for the dc bus of wind power pitch-controlled system provides power to support.Power density is big, the speed that discharges and recharges is fast because ultracapacitor has, recycle advantages such as the life-span is long, adds to discharge and recharge control strategy efficiently, can increase substantially the technical performance and the economic performance of system.
Description of drawings
Fig. 1 is a wind electricity change paddle UPS system block diagram of the present invention.
Fig. 2 is one of charge-discharge circuit electrical schematic diagram of the present invention.
Fig. 3 is two of a charge-discharge circuit electrical schematic diagram of the present invention.
Fig. 4 is the theory diagram of control circuit of the present invention.
Fig. 5 is the software flow pattern that matches with Fig. 4.
Fig. 6 is a ultracapacitor charging algorithm schematic diagram of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Shown in Fig. 1～6.
A kind of wind electricity change paddle UPS system based on ultracapacitor, comprise ultracapacitor 10, charge-discharge circuit 20, contactor 50 and control circuit 30, as shown in Figure 1, the input of the output termination charge-discharge circuit 20 of described ultracapacitor 10, the output termination dc bus 40 of charge-discharge circuit 20, contactor 50 is serially connected on the output line of dc bus 40, the control input end of output connection control circuit 30 correspondences of the transducer 80 that charge-discharge circuit 20 is embedded, a control output end of control circuit 30 connects the control input end of charge-discharge circuit 20, another control output end of control circuit 30 connects the control end of contactor 50, control circuit 30 also is connected with voltage and current signal transducer 60,70, the input of voltage and current signal transducer 60 links to each other with ultra-capacitor 10, and the input of voltage and current signal transducer 60 links to each other with dc bus 40.
During concrete enforcement:
Ultracapacitor 10 or be monomer structure, or be the bank of super capacitors of forming by the connection in series-parallel of monomer ultracapacitor.Ultracapacitor 10 can adopt double electric layer capacitor, also can adopt electrochemical capacitor.A plurality of single ultracapacitors are composed in series series arm earlier, with two or more series arm parallel connection, are combined into bank of super capacitors again, concrete connection in series-parallel assembled scheme is wanted the actual conditions of viewing system and is decided.In order to improve the capacity utilance of bank of super capacitors, and monomer voltage is limited to below the maximum operating voltage, bank of super capacitors can adopt the series average-voltage device, can also adopt the connection in series-parallel change-over circuit.
Charge-discharge circuit 20 can adopt two kinds of forms, wherein a kind of charge-discharge circuit 20 can be made up of two-way Buck-Boot circuit 120, as shown in Figure 2, it comprises controlled power switching tube 23,25, power diode 24,26, inductance 22, filter capacitor 21,27, the 22a end of inductance 22 is connected with the anode 100a of port one 00; The 22b end of inductance 22 is connected with the negative electrode 24a end of the 23a end of power switch pipe 23 and power diode 24, and the 23b end of power switch pipe 23 is connected with the anode 24b of diode 24, and is connected with the negative terminal 100b of port one 00 and the negative terminal 29b of port 29; The 22b end of inductance 22 is connected with the anode 26a end of the 25a end of power switch pipe 25 and power diode 26, and the 25b end of power switch pipe 25 is connected with the negative electrode 26b of diode 26, and is connected with the anode 29a of port 29; Filter capacitor 21 is connected in parallel with port one 00, and filter capacitor 27 is connected in parallel with port 29.
The charge-discharge circuit 20 of another kind of version can be composed in parallel by unidirectional Buck and unidirectional Boost circuit 121, as shown in Figure 3, it comprises controlled power switching tube 203,207, power diode 204,206, inductance 202,205, filter capacitor 201,208, and the 202a end of inductance 202 is connected with the anode 100a of port one 00; The 202b end of inductance 202 is connected with the anode 204a end of the 203a end of power switch pipe 203 and power diode 204; The negative electrode 204b end of power diode 204 is connected with the anode 100a of port one 00; The 203b end of power switch pipe 203 is connected with the negative terminal 100b of port one 00 and the negative terminal 209b of port 209; The 205a end of inductance 205 is connected with the anode 100a of port one 00; The 205b end of inductance 205 is connected with the negative electrode 204a end of the 207a end of power switch pipe 207 and power diode 206; The 207b end of power switch pipe 207 is connected with the anode 209a of port 209; The anode 206b end of power diode 206 is connected with the negative terminal 100b of port one 00 and the negative terminal 209b of port 209; Filter capacitor 201 is connected in parallel with port one 00, and filter capacitor 208 is connected in parallel with port 209.
Control method of the present invention is:
A kind of control method of the wind electricity change paddle UPS system based on ultracapacitor, at first by 31 sampling dc buss, 40 terminal voltages of the signal sampling unit in the control circuit 30, the voltage of bank of super capacitors 10 and charge and discharge electric current, output voltage signal is given A/D converting unit 32, and A/D converting unit 32 is given calculation control unit 34 with the digital signal of conversion; Calculation control unit 34 is given with user instruction in user instruction unit 33, calculation control unit 34 through isolation drive unit 35, drives the power switch pipe 203 in the ultracapacitor charge-discharge circuit 20 according to the control procedure output control signal of setting, 207, realize control procedure; After the start, whether Control Software at first judges dc bus 40 terminal voltages greater than bank of super capacitors 10 voltages, if greater than bank of super capacitors 10 voltages, and then closed contactor 50; Judge that then whether dc bus 40 terminal voltages reach set point, if less than set point, then enter discharge procedures, control controlled power switching tube 25 is not worked, drive controlled power switching tube 23, perhaps control controlled power switching tube 207 and do not work, drive controlled power switching tube 203; Otherwise, entering charging procedure, control controlled power switching tube 23 is not worked, and drives controlled power switching tube 25, perhaps controls controlled power switching tube 203 and does not work, and drives controlled power switching tube 207; In charging procedure, software judges whether bank of super capacitors 10 voltages reach the maximum V0 of setting, if reach, then stops charging; Then whether software judges bank of super capacitors 10 voltages less than set point V1, if less than, then bank of super capacitors 10 is charged, and adopt large current charge; At last, software judges that bank of super capacitors 10 voltages are whether between set point V2 and V3, if then changing charged state is low current charge.
The control method of wind electricity change paddle UPS of the present invention is realizing under the prerequisite of systemic-function, strives efficiently, energy-conservation, and can reduce the installed capacity of energy storage device, prolongs the useful life of ultracapacitor, improves economy.Its control thought basic principle comprise following some.
The first, give full play to the unsteady flow control action of charge-discharge circuit, the capacity of reasonable disposition bank of super capacitors is realized satisfying bigger power demand and energy requirement with less capacity, reduces the installation cost of energy storage device.
The second, when ultracapacitor is released energy, according to the state of dc bus end, the state-of-charge of energy storage device, and the demand of power, change the series and parallel pattern of super capacitor group,, avoid the ultracapacitor overdischarge simultaneously with power and the voltage request that satisfies the dc bus end.
The 3rd, during ultracapacitor energy storage,, change charging process according to the state-of-charge of bank of super capacitors, guarantee again not overcharge when making ultracapacitor reach fullcharging.
Main purpose of the present invention is for wind electricity change paddle provides continual DC power supply apart from the dc bus of system, guarantees the stable of dc bus.The startup of whole wind electricity change paddle UPS system and cut-out are all controlled by the user.
After device comes into operation, its course of work is, at first detect each system parameters,, select suitable charging current according to the energy storage condition of bank of super capacitors, charge to bank of super capacitors by charge-discharge circuit by the dc bus end, when the energy of bank of super capacitors storage hour, adopt big electric current quick charge, when the time near the fullcharging state, adopt low current charge, to avoid overcharging of super capacitor group.After bank of super capacitors stores full energy, stop its charging, but after bank of super capacitors consumed portion of energy owing to self discharge, control circuit was controlled charge-discharge circuit again and by dc bus bank of super capacitors is charged.
Control circuit detects the voltage of dc bus end, when dropping into certain numerical value, stop bank of super capacitors being charged, if the dc bus terminal voltage continues to drop to certain numerical value, then by charge-discharge circuit it is powered by bank of super capacitors, the size of power output will be decided on the rate of change of dc bus power, so that busbar voltage maintains in certain scope.Recover just often when control circuit detects DC bus-bar voltage, stop the power supply of bank of super capacitors the dc bus end.
When grid power blackout,, when bank of super capacitors is powered to the dc bus end by charge-discharge circuit, only guarantee the requirement of dc bus end lowest power in order to prolong the operating time of whole wind electricity change paddle UPS system.Along with the continuation of ultracapacitor discharge process, change the series and parallel combining structure of bank of super capacitors inside, so that bank of super capacitors is kept the continued power of higher voltage level realization to the dc bus end.
In to the bank of super capacitors charging and discharging process, constantly detect its temperature, suitably adjust power output or input size, the heating of bank of super capacitors is controlled within the specific limits, to improve the useful life of bank of super capacitors.When abnormal conditions such as voltage jump occurring when bank of super capacitors, disconnect whole system, and the prompting user.
Be further described below in conjunction with accompanying drawing:
As shown in Figure 1, wind electricity change paddle UPS system of the present invention comprises bank of super capacitors 10, charge-discharge circuit 20, control circuit 30 and the contactor of being made up of the connection in series-parallel of one or more ultracapacitor monomer 50.Bank of super capacitors 10 is connected with charge-discharge circuit 20, and charge-discharge circuit 20 is connected with dc bus 40 by contactor 50, and control circuit 30 is connected with charge-discharge circuit 20.Control circuit 30 is controlled the course of work of charge-discharge circuits 20, and is controlling the break-make of whole system and dc bus 40 by contactor 50.The work of control circuit 30 control charge-discharge circuits 20 has determined the energy Flow process between bank of super capacitors 10 and the dc bus 40.When energy when dc bus 40 flows to bank of super capacitors 10, dc bus 40 gives bank of super capacitors 10 chargings; When energy when bank of super capacitors 10 flows to dc bus 40, bank of super capacitors 10 gives dc bus 40 discharges.
Fig. 2 is a kind of two-way DC/DC converter of charge-discharge circuit 20 of the present invention.By controlled power switching tube 23,25, power diode 24,26, inductance 22, filter capacitor 21,27, input/ output terminal 100 and 29 is formed; The 22a end of inductance 22 is connected with the anode 100a of port one 00; The 22b end of inductance 22 is connected with the negative electrode 24a end of the 23a end of power switch pipe 23 and power diode 24, and the 23b end of power switch pipe 23 is connected with the anode 24b of power diode 24, and is connected with the negative terminal 100b of port one 00 and the negative terminal 29b of port 29; The 22b end of inductance 22 is connected with the anode 26a end of the 25a end of controlled power switching tube 25 and power diode 26, and the 25b end of controlled power switching tube 25 is connected with the negative electrode 26b of power diode 26, and is connected with the anode 29a of port 29; Filter capacitor 21 is connected in parallel with port one 00, and filter capacitor 27 is connected in parallel with port 29.Wherein, controlled power switching tube 23 and 25 includes but not limited to MOSFET, IGBT, IGCT etc., and present embodiment adopts the IPM module that IGBT device for power switching and drive circuit thereof are integrated, and this inside modules has overcurrent, overheat protective function.When port one 00 as input, port 29 is during as output, circuit is step-up DC/DC, power diode 24 and controlled power switching tube 25 are not worked, controlled power switching tube 23 is with the work of power diode 26 control circuits.When port 29 as input, port one 00 is during as output, circuit is voltage-dropping type DC/DC, controlled power switching tube 23 and power diode 26 are not worked, controlled power switching tube 25 is with the work of power diode 24 control circuits.
Fig. 3 is the another kind of two-way DC/DC converter of charge-discharge circuit 20 of the present invention.It is to be formed by unidirectional BUCK circuit and unidirectional BOOST circuit reverse parallel connection.By controlled power switching tube 203 and 207, power diode 204 and 206, inductance 202 and 205, filter capacitor 201 and 208, input/ output terminal 100 and 29 is formed; The 202a end of inductance 202 is connected with the anode 100a of port one 00; The 202b end of inductance 202 is connected with the anode 204a end of the 203a end of power switch pipe 203 and power diode 204; The negative electrode 204b end of power diode 204 is connected with the anode 100a of port one 00; The 203b end of power switch pipe 203 is connected with the negative terminal 100b of port one 00 and the negative terminal 29b of port 29; The 205a end of inductance 205 is connected with the anode 100a of port one 00; The 205b end of inductance 205 is connected with the negative electrode 204a end of the 207a end of power switch pipe 207 and power diode 206; The 207b end of power switch pipe 207 is connected with the anode 29a of port 29; The anode 206b end of power diode 206 is connected with the negative terminal 100b of port one 00 and the negative terminal 29b of port 29; Filter capacitor 201 is connected in parallel with port one 00, and filter capacitor 208 is connected in parallel with port 29.Wherein, controlled power switching tube 23 and 25 includes but not limited to MOSFET, IGBT, IGCT etc., the MOSFET power device can be used for the BUCK circuit when specifically implementing, and the IGBT power device is used for the BOOST circuit.Because BUCK circuit and BOOST circuit are separated, and the electric current of BUCK circuit is less, MOSFET and drive circuit thereof can adopt the little device of power grade, have saved cost.The driving of Boost circuit and protective circuit adopt the EXB841 drive circuit chip, and this chip carries overcurrent protection function.When port one 00 as input, port 29 is during as output, circuit is step-up DC/DC, inductance 205, power diode 206 and controlled power switching tube 207 are not worked, inductance 202, controlled power switching tube 203 is with the work of power diode 204 control circuits.When port 29 as input, port one 00 is during as output, circuit is voltage-dropping type DC/DC, inductance 202, controlled power switching tube 203 and power diode 204 are not worked, inductance 205, power diode 206 is with the work of controlled power switching tube 207 control circuits.
As shown in Figure 4, control circuit 30 of the present invention comprises signal sampling unit 31, A/D converting unit 32, user instruction unit 33, calculation control unit 34, and isolation drive unit 35.Wherein, calculation control unit 34 includes but not limited to digital signal processor DSP, single-chip microcomputer, embedded system etc.Signal sampling unit 31 adopts voltage sensor, current sensor, temperature sensor that the state parameter of system is sampled respectively, comprises dc bus 40 voltages, the voltage of bank of super capacitors 10, charging and discharging currents and temperature.Output voltage signal is given A/D converting unit 32, and gives calculation control unit 34 with the digital signal that transforms.Calculation control unit 34 is given with user instruction in user instruction unit 33, comprises stopping and moving of whole device.Calculation control unit 34 through isolation drive unit 35, drives the controlled power switching tube in the charge-discharge circuit 20 according to the control procedure output control signal of setting, and realizes control procedure.The control procedure of setting comprises: after device starts, detect the voltage of dc bus 40 and bank of super capacitors 10 earlier, judge whether system inserts; When line voltage occurs when unusual, judge the voltage of dc bus, if dropped into certain set point, then start discharge procedures and give dc bus 40 power supplies by bank of super capacitors 10; When line voltage just often, according to the voltage condition of bank of super capacitors 10, whether decision to bank of super capacitors 10 chargings, and adopt large current charge or low current charge.
Figure 5 shows that the flow chart of Control Software.After device starts, at first detect the voltage of dc bus 40 and bank of super capacitors 10, if the voltage of dc bus 40 is lower than the voltage of bank of super capacitors 10, in order to protect ultracapacitor and whole wind electricity change paddle UPS system, system does not insert.Be higher than bank of super capacitors 10 voltages up to dc bus 40 voltages, closed contactor 50 inserts wind electricity change paddle UPS system; Judge the voltage of dc bus, if dropped into certain set point, then start discharge procedures, control controlled power switching tube 25 is not worked, drive controlled power switching tube 23, perhaps control controlled power switching tube 207 and do not work, drive controlled power switching tube 203, give dc bus 40 power supplies by bank of super capacitors 10; If dc bus 40 voltages are normal, then to bank of super capacitors 10 chargings, control controlled power switching tube 23 is not worked, drive controlled power switching tube 25, perhaps controlling controlled power switching tube 203 does not work, drive controlled power switching tube 207, and according to the voltage condition of bank of super capacitors 10, large current charge or low current charge are adopted in decision.The ring control that stagnates is adopted in the conversion of charging current.
When the fluctuation of electrical network caused the voltage fluctuation of dc bus 40 even falls, the control bank of super capacitors was DC bus powered.Stable for the voltage that guarantees dc bus 40, the DC bus-bar voltage after boosting will equal electrical network dc bus 40 voltages just often as far as possible.But simultaneously in order detection of grid to recover situation just often, the voltage of control dc bus 40 is different from electrical network DC bus-bar voltage just often.When bank of super capacitors 10 is given dc bus 40 power supplies, take under-voltage protection to ultracapacitor, when the voltage of bank of super capacitors 10 is lower than certain value, stop the discharge of bank of super capacitors, to avoid the deep discharge of bank of super capacitors 10.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (3)
1. wind electricity change paddle UPS system based on ultracapacitor, described ups system comprises bank of super capacitors (10), charge-discharge circuit (20), contactor (50) and control circuit (30), described charge-discharge circuit (20) is made up of two-way Buck-Boost circuit (120), it comprises the first controlled power switching tube (23), the second controlled power switching tube (25), first power diode (24), second power diode (26), first inductance (22), first filter capacitor (21) and second filter capacitor (27), an end (22a) of first inductance (22) is connected with the anode (100a) of first power port (100); The other end (22b) of first inductance (22) is connected with an end (23a) of the first controlled power switching tube (23) and negative electrode (24a) end of first power diode (24), the other end (23b) of the first controlled power switching tube (23) is connected with the anode (24b) of first power diode (24), and is connected with the negative terminal (100b) of first power port (100) and the negative terminal (29b) of second source port (29); The other end (22b) of first inductance (22) is connected with an end (25a) of the second controlled power switching tube (25) and anode (26a) end of second power diode (26), the other end (25b) of the second controlled power switching tube (25) is connected with the negative electrode (26b) of second power diode (26), and is connected with the anode (29a) of second source port (29); First filter capacitor (21) is connected in parallel with first power port (100), and second filter capacitor (27) is connected in parallel with second source port (29); Described charge-discharge circuit (20) also can be composed in parallel by unidirectional Buck and unidirectional Boost circuit (121), it comprises the 3rd controlled power switching tube (203), the 4th controlled power switching tube (207), the 3rd power diode (204), the 4th power diode (206), second inductance (202), the 3rd inductance (205), the 3rd filter capacitor (201) and the 4th filter capacitor (208), and an end (202a) of second inductance (202) is connected with the anode (100a) of first power port (100); The other end (202b) of second inductance (202) is connected with an end (203a) of the 3rd controlled power switching tube (203) and anode (204a) end of the 3rd power diode (204); Negative electrode (204b) end of the 3rd power diode (204) is connected with the anode (29a) of second source port (29); The other end (203b) of the 3rd controlled power switching tube (203) is connected with the negative terminal (29b) of the negative terminal (100b) of first power port (100) and second source port (29); One end (205a) of the 3rd inductance (205) is connected with the anode (100a) of first power port (100); The other end (205b) of the 3rd inductance (205) is connected with an end (207a) of the 4th controlled power switching tube (207) and negative electrode (204a) end of the 4th power diode (206); The other end (207b) end of the 4th controlled power switching tube (207) is connected with the anode (29a) of second source port (29); Anode (206b) end of the 4th power diode (206) is connected with the negative terminal (100b) of first power port (100) and the negative terminal (29b) of second source port (29); The 3rd filter capacitor (201) is connected in parallel with first power port (100), the 4th filter capacitor (208) is connected in parallel with second source port (29), the input that it is characterized in that the output termination charge-discharge circuit (20) of described bank of super capacitors (10), the output termination dc bus (40) of charge-discharge circuit (20), contactor (50) is serially connected on the output line of dc bus (40), the control input end that the output connection control circuit (30) of the transducer (80) that charge-discharge circuit (20) is embedded is corresponding, a control output end of control circuit (30) connects the control input end of charge-discharge circuit (20), and another control output end of control circuit (30) connects the control end of contactor (50); Signal sampling unit (31) sampling dc bus (40) terminal voltage in the control circuit (30), the voltage of bank of super capacitors (10) and charge and discharge electric current, output voltage signal is given A/D converting unit (32), and A/D converting unit (32) is given calculation control unit (34) with the digital signal of conversion; Calculation control unit (34) is given with user instruction in user instruction unit (33), calculation control unit (34) is according to the control procedure output control signal of setting, through isolation drive unit (35), drive the first and second controlled power switching tubes of ultracapacitor charge-discharge circuit (20), perhaps the third and fourth controlled power switching tube is realized control procedure; Whether described control procedure judges dc bus (40) terminal voltage greater than bank of super capacitors (10) voltage, if greater than bank of super capacitors (10) voltage, then closed contactor (50); Judge then whether dc bus (40) terminal voltage reaches set point, if less than set point, then enter discharge procedures, controlling the second controlled power switching tube (25) does not work, drive the first controlled power switching tube (23), perhaps control the 4th controlled power switching tube (207) and do not work, drive the 3rd controlled power switching tube (203); If more than or equal to set point, enter charging procedure, control the first controlled power switching tube (23) and do not work, drive the second controlled power switching tube (25), perhaps control the 3rd controlled power switching tube (203) and do not work, drive the 4th controlled power switching tube (207); In charging procedure, software judges whether bank of super capacitors (10) voltage reaches the maximum V0 of setting, if reach, then stops charging; Then whether software judges bank of super capacitors (10) voltage less than set point V1, if less than, then bank of super capacitors (10) is charged, and adopt large current charge; At last, software judges that bank of super capacitors (10) voltage is whether between set point V2 and V3, if then changing charged state is low current charge.
2. the wind electricity change paddle UPS system based on ultracapacitor according to claim 1, it is characterized in that described control circuit (30) also is connected with the first voltage and current signal transducer (60) and the second voltage and current signal transducer (70), the input of the first voltage and current signal transducer (60) links to each other with ultra-capacitor (10), and the input of the second voltage and current signal transducer (70) links to each other with dc bus (40).
3. the wind electricity change paddle UPS system based on ultracapacitor according to claim 1, it is characterized in that described control circuit (30) comprises signal sampling unit (31), A/D converting unit (32), user instruction unit (33), calculation control unit (34) and isolation drive unit (35), wherein be responsible for the acquisition system parameter, the output of the signal sampling unit (31) of output voltage signal links to each other with A/D converting unit (32) corresponding input end, the output of A/D converting unit (32) links to each other with calculation control unit (34), the output of user instruction unit (33) also links to each other with calculation control unit (34) corresponding input end, and the control signal output ends of calculation control unit (34) links to each other with isolation drive unit (35) corresponding input end.
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| CN 200810024657 CN101252290B (en) | 2008-03-31 | 2008-03-31 | Wind electricity change paddle UPS system based on super capacitor |
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| CN 200810024657 CN101252290B (en) | 2008-03-31 | 2008-03-31 | Wind electricity change paddle UPS system based on super capacitor |
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| CN101252290B true CN101252290B (en) | 2010-11-10 |
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Cited By (1)
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| CN103715679A (en) * | 2013-12-11 | 2014-04-09 | 四川中光防雷科技股份有限公司 | Thunder and lightning storage and protection method and device thereof based on energy storage by capacitor |
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