CN202906464U - Active parallel mixed energy-storage device stabilizing fluctuated power of renewable energy - Google Patents

Active parallel mixed energy-storage device stabilizing fluctuated power of renewable energy Download PDF

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CN202906464U
CN202906464U CN 201220088059 CN201220088059U CN202906464U CN 202906464 U CN202906464 U CN 202906464U CN 201220088059 CN201220088059 CN 201220088059 CN 201220088059 U CN201220088059 U CN 201220088059U CN 202906464 U CN202906464 U CN 202906464U
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power
energy
hybrid accumulator
storage device
way chopper
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孙辉
于芃
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Dalian University of Technology
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Dalian University of Technology
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Abstract

Provided is an active parallel mixed energy-storage device stabilizing fluctuated power of renewable energy, belonging to the technical field of design and application of energy-storage devices. The device is characterized in that the mixed energy-storage device is connected in parallel to a power generating systems with renewable energy; a bidirectional rectifier/inverter is selectively connected according to different power generating system (AC/DC); the mixed energy-storage device is composed of a bidirectional chopper DC/DC (A) 3, a bidirectional chopper DC/DC (B) 4, a super capacitor 5 and a storage battery 6, wherein the bidirectional chopper DC/DC (A) 3 controls total charging/discharging power of the energy-storage device, and the bidirectional chopper DC/DC (B) 4 controls charging/discharging power of the storage battery, so as to stabilize the fluctuated power of the power generating system with renewable energy; and the bidirectional rectifier/inverter operates to maintain a stable voltage state in a DC side. The active parallel mixed energy-storage device stabilizing fluctuated power of renewable energy has the effects and advantages that the power generating system with renewable energy is stable in power and controllable in grid connection; the energy-storage advantages of the storage battery and the super capacitor are fully performed to reduce the investment of the energy-storage device and prolong the service life; and the energy-storage device of the utility model is both practical and economic.

Description

Stabilize the active parallel-connection type hybrid accumulator of regenerative resource fluctuating power
Technical field
The utility model belongs to energy storage device design and application technical field.Relate to a kind of active parallel-connection type mixing arrangement that is formed by storage battery, ultracapacitor, two-way chopper DC/DC (A) and two-way chopper DC/DC (B) and access renewable energy system by parallel way, fluctuating power to renewable energy system output carries out real-time stabilizing, and realizes steadily being incorporated into the power networks of renewable energy system.Be particularly related to the compound mode of energy-storage travelling wave tube in the hybrid accumulator and two-way chopper DC/DC (A), two-way chopper DC/DC (B), biphase rectification/inverter to the control that discharges and recharges of storage battery, ultracapacitor.
Background technology
Along with the day by day exhaustion of traditional non-renewable energy resources such as coal, oil and natural gas and increasingly sharpening of global warming trend, countries in the world all begin Devoting Major Efforts To Developing and utilize green non-pollution, the reproducible energy, such as wind energy, solar energy, oceanic energy etc.Wherein, utilizing renewable energy power generation is one of effective means that large-scale develops and utilizes regenerative resource.
Be subjected to the impact of the factors such as natural environment, weather, weather, the energy of the regenerative resources such as wind energy, solar energy, oceanic energy has very strong randomness, pulsating nature and uncontrollability.Because the power output of electricity generation system depends on the supply of primary energy, so the power output of renewable energy system has very strong stochastic volatility.The electric energy of this fluctuation can break the original power/energy balance of electrical network after being incorporated into the power networks and exporting, and then bring series of negative impact, the safe and stable operation of serious threat electrical network can at aspects such as the quality of power supply, traffic control, planning constructions electrical network.Fluctuating power to renewable energy system output is stabilized in real time, realizes the power output of steadily being incorporated into the power networks, and is guarantee renewable energy system one of the key of safe and stable operation that is incorporated into the power networks.
Energy storage device generally has the two-way handling capacity of quick, flexible, controlled power/energy, is applicable to carry out fast, accurately Power Exchange with renewable energy system, and then realizes stabilizing fluctuating power " peak load shifting ".When adopting energy storage device to stabilize the fluctuating power of renewable energy system output, generating set still can continue original moving model, need not generating set is carried out extra technological transformation.Simultaneously, the fluctuating power bigger than normal or less than normal of in real time output of renewable energy system finally all can be sent in the electrical network after the energy storage device buffering, and under the sufficiently high prerequisite of energy storage efficiency, the energy loss in the power adjustment procedure is very little.Continuous maturation along with energy storage technology, the continuous decline of energy-storage travelling wave tube cost utilizes energy storage device to stabilize in real time the fluctuating power of renewable energy system output, improves the controllability of power output, make it become schedulable generator unit, become current main way and the focus of research.
Utilize statistical research to find, the real-time random fluctuation power of exporting of renewable energy system can be decomposed into for a long time, steady-sxtate wave motion power and the paroxysmal peak power of continuation fluctuate.In addition, the fluctuation of renewable energy system power output also presents frequent characteristic toward renaturation.Therefore, if realize to fluctuating power comprehensively, stabilize in real time, not only need energy storage device to have long-time, jumbo electric energy handling capacity (being used for stabilizing steady-sxtate wave motion power), also require energy storage device to have the good high-power responding ability (being used for stabilizing the peaked wave kinetic power) that discharges and recharges.From reducing the angle of energy storage device investment and operating cost, need be with the characteristic of high power density, high-energy-density and long service life cycle for the energy storage device of stabilizing in real time the renewable energy system fluctuating power.
At present, common electric power energy storage mode has: superconducting energy storage, pumped storage, flywheel energy storage, compressed-air energy storage, batteries to store energy, capacitor deposited energy etc.Wherein, the energy storage modes such as pumped storage, flywheel energy storage, compressed air, superconducting energy storage are subjected to the restriction of the aspects such as technical merit, geographical environment, service conditions, up-front investment expense, temporarily can't carry out large-scale development and use.Battery energy storage, ultracapacitor energy storage are owing to having convenient, efficient energy/power handling capacity, running environment being safeguarded the characteristics such as simple, that up-front investment is relatively cheap without harshness requirement, run duration, and the every field of living at national product has obtained being widely used.
Common energy-storage battery has lead-acid battery, ickel-cadmium cell, Ni-H cell, lithium ion battery, sodium-sulphur battery etc.Estimate from cycle life, power density, energy density three aspects:, every kind of battery has its advantage separately with not enough, generally has on the whole the characteristics of low power density, high-energy-density, low service life cycle.Therefore, storage battery is only applicable to regulate steady-sxtate wave motion power, can give full play to the large advantage of its energy density.But when storage battery was used for alone stabilizing the fluctuating power of renewable energy system output, not only the configuration that exceeds the quata (being used for stabilizing paroxysmal spike merit fluctuation ratio) of required power caused the rising of cost of investment; Also can be because carrying out the frequent shortening that causes service life that discharges and recharges toward renaturation.
Ultracapacitor is emerging in the last few years a kind of electric power energy storage device, and it has the characteristics such as service life cycle is long, operating temperature range is wide, the speed that discharges and recharges is fast, power density is large, energy density is relatively low.Therefore, ultracapacitor can not satisfy equally and stabilizes in real time the renewable energy system fluctuating power to the performance requirement of energy storage device.Because the large advantage of its power density, ultracapacitor is applicable to stabilize the peaked wave kinetic power.
According to the energy storage characteristic of ultracapacitor and storage battery, constantly there is the expert to propose the mode of employing storage battery-super capacitor mixed energy storage.This mode is so that the separately advantage of batteries to store energy and ultracapacitor energy storage is able to complementation.Wherein, the storage battery demand of handling up in order to satisfy large capacity electric energy; The demand that ultracapacitor is handled up in order to satisfy peak power.Storage battery-super capacitor mixed energy storage is so that the overall performance of energy storage device has obtained greatly raising, can satisfy and stabilize in real time the renewable energy system fluctuating power to the performance requirement of energy storage device, can effectively save investment and the operating cost of energy storage device.
Summary of the invention
The technical problems to be solved in the utility model is: design a kind of novel hybrid accumulator, can carry out fast, accurately power/energy exchange with renewable energy system, realize stabilizing renewable energy system output pulsation power " peak load shifting "; The novel hybrid accumulator that designs needs the characteristic (namely satisfy and stabilize in real time the renewable energy system fluctuating power to the performance requirement of energy-storage system) with high power density, high-energy-density, high cycle life; This novel hybrid accumulator need realize different energy-storage travelling wave tubes are discharged and recharged the independent fine adjustment of power, and then can give full play to the energy storage advantage of different energy-storage travelling wave tubes in the process of stabilizing in real time fluctuating power.
The technical solution of the utility model is: a kind of active parallel-connection type hybrid accumulator of stabilizing the regenerative resource fluctuating power, it is characterized in that: this hybrid accumulator comprises two-way chopper DC/DC (A) 3, two-way chopper DC/DC (B) 4, ultracapacitor 5, storage battery 6; When renewable energy system was direct current system, the dc output end of hybrid accumulator was in parallel with the dc bus of electricity generation system; When renewable energy system was AC system, the dc output end of hybrid accumulator was in parallel with alternating current power-generating system through biphase rectification/inverter 9.
This hybrid accumulator is characterised in that: storage battery 6 is connected to the low-pressure side of two-way chopper DC/DC (B) 4, the high-pressure side of two-way chopper DC/DC (B) 4 ultracapacitor in parallel, then be connected into the low-pressure side of two-way chopper DC/DC (A) 3, the high-pressure side of two-way chopper DC/DC (A) 3 is the output of this hybrid accumulator; Ultracapacitor (5) plays power buffer in hybrid accumulator, two-way chopper DC/DC (A) 3 is independent controlled with the running of two-way chopper DC/DC (B) 4, two-way chopper DC/DC (B) 4 is responsible for the power that discharges and recharges of control storage battery, and two-way chopper DC/DC (A) 3 is responsible for the gross power that discharges and recharges of control energy storage device.
In the designed hybrid accumulator of the utility model, according to the demand of stabilizing renewable energy system output pulsation power, the flexibly two-way chopper DC/DC of control (A) 3, two-way chopper DC/DC (B) 4 make that storage battery 6 and ultracapacitor 5 carry out power fast, accurately, energy is handled up.In this hybrid accumulator, because the energy/power cushioning effect of ultracapacitor, two-way chopper DC/DC (A) 3, two-way chopper DC/DC (B) 4 can realize decoupling zero control.Accurately control the power that discharges and recharges of storage battery by two-way chopper DC/DC (B) 4, energy storage device can be discharged and recharged gross power (by two-way chopper DC/DC (A) 3 controls) flexible allocation between storage battery and ultracapacitor, regulate respectively dissimilar fluctuating powers for storage battery, ultracapacitor and established architecture basics.
Ultracapacitor has the characteristic that power density is large, have extended cycle life, discharge and recharge fast response time, therefore is applicable to stabilize the peaked wave kinetic power of renewable energy system output.Therefore storage battery should become the main energy source in the energy storage device owing to have the large advantage of energy density.In stabilizing the process of fluctuating power, because the participation of ultracapacitor, the response frequency that discharges and recharges of storage battery has obtained reduction, has avoided simultaneously carrying out high-power discharging and recharging, but so useful life of significant prolongation storage battery.
In the process of stabilizing in real time renewable energy system output pulsation power, for realizing giving full play to of storage battery and separately energy storage advantage of ultracapacitor, prolong the useful life of energy storage device, formulating the energy management rule for the operation of this hybrid accumulator is: in energy storage device carried out process that energy/power handles up, ultracapacitor will be followed the principle that preferentially discharges and recharges all the time; Storage battery is the energy in support, is used for the state-of-charge of ultracapacitor is regulated in real time.Ultracapacitor can be given full play to the advantage that its power density is large, discharge and recharge fast response time, have extended cycle life by following the principle that preferentially discharges and recharges, and realizes peaked wave kinetic power and stabilizing toward the renaturation fluctuating power.Storage battery will become the final energy source of stabilizing renewable energy system steady-sxtate wave motion power by the real-time adjusting to the ultracapacitor state-of-charge, can the large advantage of metric density obtain giving full play to.
According to energy management rule and stabilize the demand of renewable energy system output pulsation power, the running of design active parallel-connection type hybrid accumulator is as follows:
(1) hybrid accumulator accumulation of energy
When the real-time power output of renewable energy system during greater than the power generation command desired value, energy storage device absorbs the too much power of renewable energy system output, and carries out stored energy.In this course, two-way chopper DC/DC (A) is responsible for the accumulation of energy gross power of control energy storage device, to satisfy the demand of stabilizing in real time fluctuating power; According to the variation of ultracapacitor real time end voltage, two-way chopper DC/DC (B) is responsible for the control storage battery and carries out discharging and recharging of specified multiplying power, realizes the real-time adjusting to the ultracapacitor state-of-charge
(2) hybrid accumulator is released energy
When the real-time power output of renewable energy system during less than the power generation command desired value, energy storage device releases energy to compensate the deficiency of renewable energy system power output.In this course, releasing of two-way chopper DC/DC (A) control energy storage device can gross power, to satisfy the demand of stabilizing fluctuating power; Two-way chopper DC/DC (B) is responsible for the control storage battery and carries out discharging and recharging of specified multiplying power, realizes the real-time adjusting to the ultracapacitor state-of-charge.
The ultracapacitor that uses in the hybrid accumulator generally adopts double electric layer capacitor.In use, a plurality of monomer ultracapacitors are formed bank of super capacitors by connection in series-parallel, improve capacity and the withstand voltage level of ultracapacitor, make its performance satisfy the demand of hybrid accumulator.
Effect of the present utility model and benefit are:
(1) under the control of two-way chopper DC/DC (A), two-way chopper DC/DC (B), this hybrid accumulator can carry out fast, accurately power/energy exchange with renewable energy system, thereby stabilize in real time the fluctuating power of renewable energy system output, realize the steady controlled output of power, can significantly improve the security and stability that renewable energy system is incorporated into the power networks.
(2) this hybrid accumulator is with the energy storage characteristic of high power density, high-energy-density, long service life cycle.With respect to single mode energy storage, this hybrid accumulator can effectively reduce investment and the operating cost of energy storage device, has broad application prospects.
(3) according to the energy storage characteristic of storage battery, ultracapacitor and the random fluctuation characteristic of renewable energy system power output, the design storage battery is used for stabilizing steady-sxtate wave motion power, ultracapacitor is used for stabilizing spike and past renaturation power fluctuation, give full play to the separately energy storage advantage of storage battery, ultracapacitor, be conducive to prolong the useful life of energy storage device.
(4) structure of this hybrid accumulator can realize that energy storage device discharges and recharges gross power flexible allocation between storage battery and ultracapacitor, brings into play separately energy storage advantage for storage battery and ultracapacitor and stabilizes respectively dissimilar fluctuating powers and established architecture basics.
(5) by the boost chopper effect of two-way chopper DC/DC (A), two-way chopper DC/DC (B), can improve the electric pressure of energy storage device, reduce the electric pressure demand to storage battery and ultracapacitor
Description of drawings
Fig. 1 is the structure chart of active parallel-connection type hybrid accumulator access regenerative resource DC power generation system.
Fig. 2 is the structure chart of active parallel-connection type hybrid accumulator access regenerative resource alternating current power-generating system.
In Fig. 1, Fig. 2: 1 regenerative resource DC power generation system; 2 DC load; 3 two-way chopper DC/DC (A); 4 two-way chopper DC/DC (B); 5 ultracapacitors; 6 storage batterys; 7 regenerative resource alternating current power-generating systems; 8 AC load; 9 biphase rectifications/inverter.
Fig. 3 is the structure principle chart of two-way chopper DC/DC (A) in the active parallel-connection type hybrid accumulator, two-way chopper DC/DC (B).
Fig. 4 is the structure principle chart of biphase rectification/inverter in the active parallel-connection type hybrid accumulator.
Embodiment
Be described in detail embodiment of the present utility model below in conjunction with technical scheme and accompanying drawing.
As shown in Figure 1, when the utility model active parallel-connection type hybrid accumulator access regenerative resource DC power generation system (such as photovoltaic system) was middle, system formed and comprises regenerative resource DC power generation system 1, DC load 2, two-way chopper DC/DC (A) 3, two-way chopper DC/DC (B) 4, ultracapacitor 5, storage battery 6.In this system, the dc bus of hybrid accumulator output access in parallel regenerative resource DC power generation system 1.According to the real-time power output of regenerative resource DC power generation system 1 and the deviation of power generation command target, the gross power that discharges and recharges by two-way chopper DC/DC (A) 3 control hybrid accumulators, fluctuating power to 1 output of regenerative resource DC power generation system carries out stabilizing of " peak load shifting ", so that the stable output power of regenerative resource DC power generation system 1 is followed the power generation command target.According to the variation of ultracapacitor terminal voltage, two-way chopper DC/DC (B) 4 control storage batterys 6 carry out discharging and recharging of specified multiplying power, regulate in real time the state-of-charge of ultracapacitor 5.
As shown in Figure 2, when the utility model active parallel-connection type hybrid accumulator access regenerative resource alternating current power-generating system (such as wind power generation, power generation with marine energy system) was middle, system formed and comprises regenerative resource alternating current power-generating system 7, AC load 8, two-way chopper DC/DC (A) 3, two-way chopper DC/DC (B) 4, ultracapacitor 5, storage battery 6, biphase rectification/inverter 9.In this system, hybrid accumulator is through in pairs in rectification/inverter 9 access regenerative resource alternating current power-generating systems 7 in parallel.According to the real-time power output of regenerative resource alternating current power-generating system 7 and the deviation of power generation command target, the gross power that discharges and recharges by two-way chopper DC/DC (A) 3 control hybrid accumulators, fluctuating power to 7 outputs of regenerative resource alternating current power-generating system carries out stabilizing of " peak load shifting ", so that the stable output power of regenerative resource alternating current power-generating system 7 is followed the power generation command target.According to the variation of ultracapacitor terminal voltage, two-way chopper DC/DC (B) 4 control storage batterys 6 carry out discharging and recharging of specified multiplying power, to realize the real-time adjusting to ultracapacitor 5 state-of-charges.Biphase rectification/inverter 9 is used for being responsible for the conversion of direct current hybrid accumulator and 7 form of energy of alternating current power-generating system.When regenerative resource alternating current power-generating system 7 real-time power outputs during less than the power generation command target, need hybrid accumulator to release energy, biphase rectification/inverter 9 works in inverter mode, and the direct current measurement that hybrid accumulator is exported feeds back in the alternating current power-generating system; When regenerative resource alternating current power-generating system 7 real-time power outputs during greater than the power generation command target, need the hybrid accumulator absorbed energy, biphase rectification/inverter 9 works in rectification state, changes ac electric into direct current measurement, thereby mixed energy storage device absorbs.Biphase rectification/inverter 9 works in the state of keeping DC side (being the hybrid accumulator DC interface) voltage stabilization, and then the power of hybrid accumulator handled up fast, is delivered to accurately, efficiently exchange the side that is incorporated into the power networks, realize stabilizing in real time regenerative resource alternating current power-generating system 7 output pulsation power.
The low-pressure side of the storage battery 6 two-way chopper DC/DC of access (B) 4, the high-pressure side of two-way chopper DC/DC (B) 4 is incorporated ultracapacitor into, then access the low-pressure side of two-way chopper DC/DC (A) 3, the high-pressure side of two-way chopper DC/DC (A) 3 is the output DC interface of hybrid accumulator.Because ultracapacitor 5 response speeds own are higher than storage battery 6 far away, and ultracapacitor 5 lacks than storage battery 6 through approach to hybrid accumulator dc output end institute and passes through one-level copped wave link, therefore no matter be hybrid accumulator charging or discharge, this structure all is conducive to bring into play the advantage that ultracapacitor 5 discharges and recharges fast response time.For two-way chopper DC/DC (A) 3, two-way chopper DC/DC (B) 4, ultracapacitor 5 has played the effect of power/energy buffer, therefore can realize the decoupling zero control between the two.Being two-way chopper DC/DC (A) 3 can complete independently control target separately with two-way chopper DC/DC (B) 4, and the operating state of the two does not interfere with each other.Wherein, two-way chopper DC/DC (A) 3 is used for the gross power that discharges and recharges of control energy storage device, to satisfy the demand of stabilizing renewable energy system output pulsation power; Two-way chopper DC/DC (B) 4 is used for control storage battery 6 and carries out discharging and recharging of specified multiplying power, with the state-of-charge of real-time adjusting ultracapacitor 5.According to the energy management rule, set the optimized working zone territory for ultracapacitor 5, when the terminal voltage of ultracapacitor 5 was in the optimized working zone territory, storage battery 6 quit work, and ultracapacitor 5 preferentially discharges and recharges to finish the task of stabilizing fluctuating power; When the terminal voltage of ultracapacitor 5 departed from the optimized working zone territory, storage battery 6 carried out discharging and recharging of specified multiplying power, and the state-of-charge of ultracapacitor 5 is regulated in real time.
The real-time power output of renewable energy system is during less than the power generation command target, and two-way chopper DC/DC (A) 3 control energy storage devices carry out permanent power discharge with the difference of the two power, with the deficiency of compensation renewable energy system power output.In this course, when the terminal voltage of ultracapacitor 5 be lower than the optimized working zone territory lower in limited time, two-way chopper DC/DC (B) 4 control storage batterys 6 are with specified multiplying power discharging, to replenish the energy of ultracapacitor; When the terminal voltage of ultracapacitor 5 was positioned at the optimized working zone territory, two-way chopper DC/DC (B) 4 quit work, and so that storage battery 6 is disconnected, ultracapacitor 5 is stabilized alone the fluctuating power of renewable energy system output.
The real-time power output of renewable energy system is during greater than the power generation command target, and two-way chopper DC/DC (A) 3 control energy storage devices carry out permanent power charging with the difference of the two power, to absorb the too much power of renewable energy system output.In this course, prescribe a time limit greater than the upper of optimized working zone territory when the terminal voltage of ultracapacitor 5, two-way chopper DC/DC (B) 4 controls storage batterys 6 and charges with specified multiplying power, to absorb the energy of ultracapacitor 5; When the terminal voltage of ultracapacitor 5 was positioned at the optimized working zone territory, two-way chopper DC/DC (B) 4 quit work, and so that storage battery 6 is disconnected, ultracapacitor 5 is stabilized alone the fluctuating power of renewable energy system output.When storage battery 6 approaching being full of, carry out the charging of constant voltage and current limiting mode by two-way chopper DC/DC (B) 4 control storage batterys 6.This charging process meets the ideal charging mode of storage battery 6 substantially, is conducive to prolong the useful life of storage battery 6.
As seen from the above analysis, in the active parallel-connection type hybrid accumulator, two-way chopper DC/DC (A) 3, two-way chopper DC/DC (B) 4 are responsible for the control that discharges and recharges of hybrid accumulator, to satisfy the demand of stabilizing in real time renewable energy system output pulsation power, this just needs the two to have fast response speed and flexibly controlled energy in bidirectional flow characteristic.In the utility model, two-way chopper DC/DC (A) 3 and two-way chopper DC/DC (B) 4 all select the topology of the two-way DC/DC converter of BUCK-BOOST type.
As shown in Figure 3, the two-way DC/DC converter of BUCK-BOOST type is by energy storage inductor L1, power switch pipe G1, G2, and sustained diode 1, D2 and output filter capacitor C1 form.The low-pressure side power positive end is received the leakage level (also being the source class of power switch pipe G2) of power switch pipe G1 through energy storage inductor L1, the negative terminal of the source electrode access converter of power switch pipe G1, the anode of the drain electrode access high-pressure side power supply of power switch pipe G2, filter capacitor C1 is parallel to the two ends, high-pressure side, and sustained diode 1, D2 are connected in anti-parallel to the leakage of power switch pipe G1, G2--between the source class.By the break-make control to power switch pipe G1, G2, can realize energy by low-pressure side to the high-pressure side or by the two-way flow of high-pressure side to low-pressure side, now the mode of operation of this converter is carried out following analysis (supposing that high-pressure side and low-pressure side all are connected to energy source):
(1) mode 1, power switch pipe G1 conducting, and power switch pipe G2 turn-offs, and to energy storage inductor L1 charging, inductive current increases the low-pressure side power supply by G1.
(2) mode 2, and power switch pipe G1 turn-offs, power switch pipe G2 conducting, because inductance L 1 electric current can not suddenly change, electric current still passes through sustained diode 2 afterflows from the low-pressure side to the high-pressure side, and gradually reduce on high-tension side inductive current from low-pressure side this moment.
(3) mode 3, remain power switch pipe G1 and turn-off this moment, and power switch pipe G2 conducting is after being reduced to gradually zero from low-pressure side in the inductance on high-tension side electric current, through power switch G2 inductance L 1 is carried out reverse charging by the high-pressure side power supply, the reverse current of the inductance L of flowing through 1 increases gradually.
(4) mode 4, power switch pipe G1 conducting, and power switch pipe G2 turn-offs, because inductance L 1 electric current can not suddenly change, the reverse current in the inductance L 1 is along sustained diode 1 reverse afterflow, the reverse current in the inductance L 1 reduces gradually at this moment.When the reverse current in the inductance L 1 reduces to 0, enter again mode 1, thereby begin next time controlled circulation.
As seen from the above analysis, in a cycle period, by to power switch pipe G1, the control of the break-make of G2 can realize the two-way flow of energy between low-pressure side and high-pressure side.When flowing on high-tension side energy when flowing to the energy of low-pressure side by the high-pressure side by low-pressure side in the one-period internal inductance, converter runs on the boost chopper state; Otherwise converter runs on the buck chopper state.Inductance depends on the make-and-break time of power switch pipe G1, G2 along the size of positive and negative both direction stored energy within each cycle, and the size of low-pressure side power supply and high-pressure side supply voltage.In the situation that high-pressure side, low-pressure side supply voltage are determined, by the ON time of regulating power switching tube G1, G2, just can accurately control direction and the size of inductance energy (electric current).
For two-way chopper DC/DC (A) 3, its low-pressure side voltage is determined that by ultracapacitor 5 terminal voltages its high side voltage is stable by biphase rectification/inverter control.Therefore, according to the size of ultracapacitor 5 terminal voltages, the duty ratio of by-pass cock pipe G1, G2, the size and Orientation of control inductive current can be realized the handle up fine adjustment of gross power size and Orientation of energy storage device.Among the two-way chopper DC/DC (A) 3, the current closed-loop control that adds the PI link is adopted in the adjusting of inductive current.
For two-way chopper DC/DC (B) 4, its low-pressure side voltage is determined that by storage battery 6 terminal voltages its high side voltage is determined by ultracapacitor 5 terminal voltages.According to the size of storage battery 6 terminal voltages, the duty ratio of by-pass cock pipe G1, G2, the size and Orientation of control inductive current can be realized the storage battery fine adjustment of watt level and direction of handling up.Among the two-way chopper DC/DC (B) 4, the current closed-loop control that adds the PI link is adopted in the adjusting of inductive current.
When the active parallel-connection type hybrid accumulator is stabilized in real time to regenerative resource alternating current power-generating system 7 output pulsation power, need the participation of biphase rectification/inverter 9 so that electric energy can be between dc energy storage device and alternating current power-generating system accurately and fast, high efficiency of transmission.Shown in figure four, the structure of biphase rectification/inverter 9 is: the positive pole of dc bus capacitor C2 is received in the drain electrode of power switch pipe G3, G4, G5 together, the source electrode of power switch pipe G3, G4, G5 is connected with the drain electrode of power switch pipe G6, G7, G8 respectively, and the source electrode of power switch pipe G6, G7, G8 is received the negative pole of dc bus capacitor C2 together.Sustained diode 3, D4, D5, D6, D7, D8 successively inverse parallel between the drain-source utmost point of each power switch pipe.L2, L3, L4 are the AC filter inductance, access in the three phase AC power generating system after the filtering output.Under (d, q) synchronous rotating frame, this biphase rectification/inverter 9 can be realized the decoupling zero control of active current and reactive current.When active parallel-connection type hybrid accumulator and biphase rectification/inverter 9 cooperation, the power of hybrid accumulator is handled up and can be caused the variation of biphase rectification/inverter 9 dc voltages (being the voltage of dc bus capacitor C2).Exchange the side that is incorporated into the power networks for realizing the power of hybrid accumulator handled up to be delivered to fast, accurately, add Voltage loop in the outside of the active current ring of biphase rectification/inverter 9.That is, biphase rectification/inverter 9 works in the stable state of dc voltage (being the voltage of dc bus capacitor C2) of keeping, thus with the power of biphase rectification/inverter 9 DC side handle up (power that is hybrid accumulator is handled up) be delivered to and exchange the side that is incorporated into the power networks.When hybrid accumulator releases energy, can cause the rising of biphase rectification/inverter 9 dc voltages, for keeping the stable of dc voltage, biphase rectification/inverter 9 can be delivered to the power output of hybrid accumulator and exchange the side (namely working in inverter mode) that is incorporated into the power networks; When the hybrid accumulator absorbed energy, can cause the reduction of biphase rectification/DC side voltage of converter, for keeping the stable of dc voltage, biphase rectification/inverter 9 will be from AC system the accumulation of energy demand (namely work in rectification state) of absorbed energy to satisfy hybrid accumulator.
Power switch pipe in above-mentioned two-way DC/DC converter, the biphase rectification/inverter 9 can be selected insulated gate bipolar transistor (IGBT), it is a kind of turn-off device, the characteristics such as it is fast to have switching response speed, and conduction voltage drop is low can adopt the IPM power model in actual use.IPM inside is on the basis of integrated IGBT and anti-paralleled diode thereof; also with driving, logic, control, detection and protective circuit, not only reduce the volume of device, shortened the development time; also strengthen the reliability of device, adapted to the developing direction of current power device.

Claims (3)

1. active parallel-connection type hybrid accumulator of stabilizing the regenerative resource fluctuating power, it is characterized in that: hybrid accumulator is by in the parallel way access renewable energy system, when renewable energy system is direct current system, the dc output end of hybrid accumulator is in parallel with the dc bus of electricity generation system, when renewable energy system was AC system, the hybrid accumulator output was through biphase rectification/inverter (9) incoming transport electricity generation system; Hybrid accumulator is by storage battery (6) and ultracapacitor (5), and two-way chopper DC/DC (A) (3), two-way chopper DC/DC (B) (4) form.
2. require described a kind of active parallel-connection type hybrid accumulator of stabilizing the regenerative resource fluctuating power according to right 1, it is characterized in that: the outlet of storage battery (6) is connected to the low-pressure side of two-way chopper DC/DC (B) (4), the high-pressure side of two-way chopper DC/DC (B) (4) ultracapacitor (5) in parallel, then be connected into the low-pressure side of two-way chopper DC/DC (A) (3), the high-pressure side of two-way chopper DC/DC (A) (3) is the dc output end of this hybrid accumulator again; Ultracapacitor (5) plays power buffer in hybrid accumulator, two-way chopper DC/DC (B) (4) is independent controlled with the running of two-way chopper DC/DC (A) (3), two-way chopper DC/DC (B) (4) is responsible for the power that discharges and recharges of control storage battery, and two-way chopper DC/DC (A) (3) is responsible for the gross power that discharges and recharges of energy storage device is controlled.
3. require described a kind of active parallel-connection type hybrid accumulator of stabilizing the regenerative resource fluctuating power according to right 1, it is characterized in that: the two-way chopper DC/DC (A) (3) in this hybrid accumulator, two-way chopper DC/DC (B) (4) adopt the topology of the two-way DC/DC converter of BUCK-BOOST type, utilize this structure to discharge and recharge power to energy storage device and carry out fast, accurately two-way control; When this hybrid accumulator and the parallel running of regenerative resource alternating current power-generating system, what rectification, inverter circuit adopted is biphase rectification/inverter (9), by stablizing of control biphase rectification/inverter (9) dc voltage, the power of hybrid accumulator handled up is delivered to alternating current power-generating system fast, accurately, finishes stabilizing in real time regenerative resource alternating current power-generating system output pulsation power.
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