CN205377391U - Be applied to high voltage insulator parameter monitoring system's mixed energy storage formula photovoltaic power - Google Patents
Be applied to high voltage insulator parameter monitoring system's mixed energy storage formula photovoltaic power Download PDFInfo
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- CN205377391U CN205377391U CN201620126794.0U CN201620126794U CN205377391U CN 205377391 U CN205377391 U CN 205377391U CN 201620126794 U CN201620126794 U CN 201620126794U CN 205377391 U CN205377391 U CN 205377391U
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- 239000012212 insulator Substances 0.000 title claims abstract description 8
- 238000004146 energy storage Methods 0.000 title abstract description 13
- 239000000411 inducer Substances 0.000 claims description 2
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O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 abstract 4
- 230000003139 buffering Effects 0.000 abstract 1
- 238000010248 power generation Methods 0.000 abstract 1
- 230000002441 reversible Effects 0.000 description 12
- 239000003990 capacitor Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000001105 regulatory Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000000051 modifying Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000000087 stabilizing Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
(B /) the utility model relates to a mix energy storage formula photovoltaic power generation power of being applied to high voltage insulator parameter monitoring system. Photovoltaic power comprises photovoltaic cell, one -way DCDC boost converter, two -way DCDC converter, mixed energy storage unit and energy the control unit. The dc bus is delivered to to the direct current that photovoltaic cell sent behind the boost converter. Adopt ultracapacitor system and the mixed energy storage of battery, ultracapacitor system is connected to the dc bus through two -way DCDC converter 1, and the battery is connected to the dc bus through two -way DCDC converter 2, and ultracapacitor system carries out the energy buffering with the battery through the inductor. Mix that the energy storage unit is can full play ultracapacitor system power density big, the circulation charge -discharge is longe -lived yu hold the characteristics that battery power density is big, has increased energy storage system's power, furthest has realized the uninterrupted power supply. This photovoltaic power has simple structure, nimble, high, the non -maintaining advantage of energy utilization of control.
Description
Technical field
This utility model patent relates to a kind of photovoltaic generation power supply being applied to High-Voltage Insulation subparameter on-line detecting system.
Background technology
High-tension insulator leakage current parameter on-line detecting system assesses the running status of supply line's mesohigh insulator exactly mainly through on-line checking leakage current virtual value and the pulse frequency.In order to realize the uninterrupted on-line monitoring of the state parameter of high-tension insulator, it is necessary to electric current driver, isolation sampling and Signal acquiring and processing module uninterrupted power supply.Owing to monitoring sensor is arranged on shaft tower with Signal acquiring and processing module, it is impossible to use normal power supplies.Moreover, owing to being operated on field and high-tension line, power module needs non-maintaining for a long time, therefore the reliability of power supply is proposed significantly high requirement.Develop power module functional, sufficiently stable and be applied to transmission line status parameter online system there is important practice significance and using value.
A kind of brand-new hybrid energy-storing formula photovoltaic generation power supply of this utility model Patent design, adopts ultracapacitor and accumulator hybrid energy-storing, adds the power of energy-storage system, farthest achieve uninterrupted power supply.There is simple in construction, control advantage flexible, that capacity usage ratio is high, non-maintaining.This photovoltaic generation power supply can be used for the power module of High-Voltage Insulation subparameter on-line detecting system.
Summary of the invention
The photovoltaic generation power supply of this utility model Patent design is made up of photovoltaic cell, DC/DCboost changer, two-way DC/DC changer, hybrid energy-storing unit and power control unit.Energy-storage units is made up of accumulator and ultracapacitor, and ultracapacitor is connected to dc bus through two-way DC/DC changer 1, and accumulator is connected to dc bus through two-way DC/DC changer 2.Ultracapacitor and accumulator carry out energy snubber by the inducer of respective changer.Hybrid energy-storing unit has given full play to the feature that ultracapacitor power density is big, cycle charge discharge electric life length is big with storage battery energy density, adds the power of energy-storage system, farthest achieves uninterrupted power supply.
The unidirectional current that photovoltaic cell sends delivers to dc bus after boost changer, and boost changer works in maximum power control pattern.According to the output of photovoltaic cell under different illumination intensity, control unit realizes impedance matching by regulating the dutycycle change load equivalent impedance of boost changer, it is achieved the maximum power output of photovoltaic cell
Power control unit is the control core of system, the mode of operation of each changer is determined by detecting battery tension super-capacitor voltage and DC bus-bar voltage, and send the logic control signal dutycycle to power device and be modulated, it is achieved the reasonable disposition of each energy source.
Below in conjunction with drawings and embodiments, this utility model patent is further illustrated.
Accompanying drawing explanation
Fig. 1 is the structure of hybrid energy-storing formula photovoltaic generation power supply, and DCBus is dc bus.Fig. 2 is the electrical schematic diagram of hybrid energy-storing formula photovoltaic generation power supply, and B1 is accumulator, and B2 is photovoltaic cell, and C is ultracapacitor, L1、L2、L3For buffer inductor.
Detailed description of the invention
In order to realize the maximum service life (MSL) of the power supply stable power-supplying to system and accumulator, single-phase DC/DCboost changer works in maximum power control pattern, according to the output of photovoltaic cell under different illumination intensity, control unit can change load equivalent impedance by the dutycycle of adjustment boost changer and realize impedance matching, it is achieved the maximum power output of photovoltaic cell.Two reversible transducers may operate in buck and boost both of which, it is possible to controls flow direction and the watt level of energy.In energy-storage system, super capacitor plays energy storage and realizes the effect of dc bus voltage stabilizing, owing to super capacitor discharge and recharge is rapid and cycle charge discharge electric life is long, so when the output power from photovoltaic cells fluctuates, first allow super capacitor action realize the energy balance, reduce the cycle charging number of times of accumulator.The energy density of accumulator is relatively big, as super capacitor fully charged/be discharged the energy storage device of rear discharge and recharge, act primarily as the effect of energy storage.
If accumulator float charge voltage, overcharged voltage, overdischarge pressure, maximum charging current respectively UbfUbmaxUbmin, ultracapacitor maximum voltage, minimum voltage respectively Ucmax,Ucmin, the output of photovoltaic cell is Pin, output voltage is Uin, bearing power is Pout。
The specific works situation of photovoltaic generation power supply is as follows:
Mode of operation 1: work as Pin<Pout, control unidirectional Boost and be in maximal power tracing controlled state, provide ceiling capacity to load.Control reversible transducer 1 and be in Boost state, regulate its dutycycle to control the discharge current of ultracapacitor to meet load needs, and maintain DC bus-bar voltage UdStablize.In this process, reversible transducer 2 is off pattern.
Mode of operation 2: in mode of operation 1, if Uc<Ucmin,, represent that super capacitor electrode forces down in the minimum voltage set, control reversible transducer 1 and work in shutdown mode, quit work.Control reversible transducer 2 in Boost state, storage battery constant-current discharge simultaneously, to load supplying together with photovoltaic cell, maintain UdStable, until Ub<Ubmin, control reversible transducer 1 in shutdown mode, stop dc bus being discharged.Accumulator adopts.
Mode of operation 3: work as Pin>Pout, regulating the dutycycle of uni-directional converter so as to work in maximal power tracing state, photovoltaic cell powers to the load, now, if Uc<Ucmax, the excess energy P of photovoltaic cell outputin-PoutPass to ultracapacitor, control reversible transducer 1 and work in Buck pattern, by the charging current of adjustment Duty ratio control electric capacity to maintain UdStable.This process controls reversible transducer 2 in shutdown mode.
Mode of operation 4:Pin>Pout, such as Uc>Ucmax, represent that ultracapacitor has reached maximum voltage.Now controlling reversible transducer 2 and work in Buck state, to accumulator constant-current charge, accumulator stores energy, and constant current charge-discharge pattern meets the charge-discharge characteristic of accumulator.In this process, in order to ensure UdStablize, control reversible transducer 1 work in Boost pattern, to maintain UdStable.
Mode of operation 5: in mode of operation 4, such as Ubmax>Ub>Ubf, control uni-directional converter and transferred to constant voltage output mode by MPPT pattern, maintain UdStable, control reversible transducer 2 simultaneously and continue to operate in Buck state, to accumulator constant voltage mode floating charging, reversible transducer 1 works in shutdown mode, quits work.
Mode of operation 6: work as Pin>Pout, such as Ub>Ubmax, now ultracapacitor and accumulator are all in fully charged state, and two two-way change devices all work in shutdown mode.Uni-directional converter continues to operate in constant voltage mode, maintains UdStable, power to load constant voltage.
Claims (2)
1. the hybrid energy-storing formula photo-voltaic power supply being applied to high-tension insulator parameter monitoring system, it is characterized in that: the hybrid energy-storing unit of power supply is made up of ultracapacitor and accumulator, ultracapacitor is connected to dc bus through two-way DC/DC changer 1, accumulator is connected to dc bus through two-way DC/DC changer 2, and ultracapacitor and accumulator carry out energy snubber by inducer.
2. the hybrid energy-storing formula photo-voltaic power supply being applied to high-tension insulator parameter monitoring system according to right 1, is characterized in that: the unidirectional current that photovoltaic cell sends delivers to dc bus after DC/DCboost changer, and dc bus is connected with load.
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| CN108695841A (en) * | 2018-06-08 | 2018-10-23 | 哈尔滨工程大学 | A kind of low-power independent photovoltaic generating system control method and its main circuit |
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