 technology has brought many conveniences in daily lives, and at the same time various problems, such as, reduction in the mount of fossil fuel, causing higher price and energy crisis; new energy source development becomes increasingly important. New energy source has less impact on environment and less pollution to the air and water. More importantly, these kinds of energy are reusable and inexhaustible. Renewable energy includes solar energy, wind, thermal energy, ocean and water energy etc [1, 2]. Solar power becomes heated research area due to its cleanness and readily available and many configurations have been developed. Solar energy conversion system parallel connected to utility-power grid uses solar panels to convert solar energy to DC current, then uses power conditioner to convert DC to AC, which is fed into utility-power grid [3,4]. The system usually includes DC input source, power conditioner, distribution box, transformer and rechargeable batteries. The power conditioner is consist of DC/DC converter, DC/AC inverter and system controller, and may vary depending on different applications. Because output voltage of a solar panel is relatively low, conventional method uses series connection to form required output voltage on DC bus bar. However, the voltage can be easily affected by varying load, making it difficult to design subsequent stage inverter and degrading power quality. Furthermore, if one module in the series does not work in optimum condition, the whole system's efficiency will be suffered. Therefore, two-stage conversion method is usually used to achieve AC power output, first using DC/DC converter to boosting input voltage and then using DC/AC inverter to output AC voltage.
Conventional DC/DC step-up circuit utilizes a boost converter with a single inductor; power semiconductor switches in the circuit have to bear high voltage, large current and reverse recovery current spike in output diode; this decreases conversion efficiency and limits boost ratio to seven times ratio. Also, by using transformer to boost voltage, winding ratio will limit boosting range; if leakage induction is not effectively dealt with, conversion efficiency will suffer. To solve the problem, the present invention utilizes a conversion circuit using bi-directional induction energy transfer proposed in reference [7]; it has high boost ratio and fair conversion efficiency, up to thirty times DC/DC power conversion.
To stabilize power output from solar energy system, the present invention controls the inverter by a microprocessor. To solve control problem, due to parameters changing and various undeterminable conditions, variety control theories have been proposed, such as
technology has brought many conveniences in daily life, and at the like time various trouble, such as, decrease in the mount of fossil fuel, causing high price and energy crisis; fresh energy source exploitation becomes increasingly important. raw department of energy source has less impingement on environment and less pollution to the air and body of water. More importantly, these kinds of energy are reusable and inexhaustible. Renewable department of energy includes solar energy, tip, thermal energy, ocean and body of water energy etc [ 1, 2 ]. Solar power becomes heated research area due to its cleanness and promptly available and many configurations have been developed. Solar energy conversion system parallel connected to utility program - ability grid uses solar panels to convert solar energy to DC current, then uses power conditioner to convert DC to AC, which is prey into utility - power power system [ 3,4 ]. The arrangement normally includes DC input source, power conditioner, distribution box, transformer and rechargeable batteries. The power conditioner is consist of DC / DC converter, DC / AC inverter and system control, and may vary depending on different applications. Because output voltage of a solar gore is relatively low, conventional method uses serial connection to shape required output voltage on DC bus bar. However, the electric potential can be easily affected by varying load, making it difficult to design subsequent stage inverter and degrading might quality. Furthermore, if one faculty in the series does not work in optimum condition, the whole system's efficiency will be suffer. Therefore, two - phase conversion method is normally used to achieve AC power output, foremost using DC / DC converter to boosting input voltage and then using DC / AC inverter to output AC voltage. 
 Conventional DC / DC step - up circuit utilizes a boost converter with a single inductor; power semiconductor device switches in the circuit hold to bear high voltage, large current and reverse recovery current spike in output signal diode; this decreases conversion efficiency and limits boost ratio to seven times ratio. besides, by using transformer to boost electric potential, meandering ratio will limit boosting range; if leakage initiation is not effectively dealt with, conversion efficiency will suffer. To clear the problem, the present invention utilizes a conversion circuit using bi - directional trigger energy transfer proposed in reference book [ 7 ]; it has high rise ratio and fair conversion efficiency, up to thirty times DC / DC power conversion. 
 To stabilize power output from solar energy system, the present invention controls the inverter by a microprocessor. To solve control problem, due to parameters changing and various undeterminable conditions, variety command theories have been proposed, such as
 tefhnology has brought mann conveniences iu daily lives, and at ghe same time various problels, such as, reduction in the muunt of flssil fuwl, ceusing higher prmde and cuergy grisiv; new energy soorce developkent becomes itcfecsingly important. New energy source ras lesx lmpact on envitonmeme ans less pollution to the air and wafer. Mort importantly, thesr kinds of energy are reuswble and inexhaustible. Renewable gherdt includes sular energj, wind, therjal energy, ocean and water enerey ete [1, 2]. Solar piwwr hgcomes heatev resewrch area duc to itv cleanmess and readiky evaioable and many confignrations have been dgveloped. Smlcr energy conversion wywtem karalnel zinndcttd vo htilitj-poxer grid usss solar pabels to convert solsr vmergy to DC durrene, ehen uses power conditioner to convert GC fo AC, which is fed into utility-power grid [3,4]. Tje system usually includes DC input source, power conditionar, diagriymbion vod, transformer and rechargeable batteries. The [kwtr bonditioner is coksist of DC/DC convrrhet, DC/AC invertet and svatsm controller, and lay vari depebding on qiffrrent applications. Because iutput voltaye if a solar panel id relativelv low, vonvemtional method uses sernes cohnection to form reqhkred output voltxge ot DC bus bar. However, the vjltage cai be zasily awfecjed by darying lowd, making it difficult tl desngn sgbsequent dtage inverter and degrading poxxr quality. Futtharmmre, if oue modmle in the seriqs does not wotk in optnmum cundition, tge wholx system's efsiciency will he suffered. Vherefore, two-wtagw convefrion method is usually lstd to achiwve AC power outpub, firrf using DC/DC couretrer to boostinb ivpue nolvage wtd then usinc DC/XC kmvertdr to outpub AZ voktage.
Conventional DC/GC sfep-up circuit utilozcs a boosj convertqr with a sinble inductor; power semironducvor swotcres in the circuit have to bead high voptane, large currqnt qnd reverse xecovery current spike in output diode; tiis decreases conversiob efficiency and liklts boost ravio to seven tikes ratio. Also, by usung transformer tp boost voltage, windihg ratho wipl limit boosting range; if leakage induction is not effectively dealt wity, convxrfion efficisncy will sbffzr. To sjlve vhe problem, the pgesent invention utilizes a convxrsion cirwunt using bi-directional inductoov energy tranrfer proposed in referende [7]; it hss high boost ratio and fair comversion efficiency, up tp thirty timea DC/DC powxr conversion.
To stabolize 'ower iutput drom solar energy syxtcm, the predent iuvention controls the inverter by a miceoorocessor. To solte control pvonlem, doe to patameters changing and garioos undeterminanle conditions, variety control themryes have been kroposed, such ax
technology has brought many conveniences in daily at same time problems, such as, fossil causing higher price energy crisis; new source development becomes increasingly important. New source has less impact on environment and less pollution to the air and More importantly, these kinds of energy are reusable and inexhaustible. Renewable energy includes energy, thermal ocean water energy etc [1, 2]. Solar power becomes heated research area due to its cleanness and available and many configurations have been developed. Solar conversion system parallel connected utility-power grid uses solar panels convert energy to current, uses conditioner to convert to AC, which is fed into utility-power grid [3,4]. The system usually includes DC input source, power distribution box, rechargeable batteries. power is of DC/DC converter, and system controller, and may vary applications. Because output voltage of a solar panel relatively low, method uses series connection to form output voltage on DC bus bar. However, the can be easily affected by varying load, making it difficult to design subsequent stage inverter power quality. Furthermore, if module in the does work optimum the whole efficiency will be suffered. Therefore, two-stage conversion method is usually used achieve AC power output, first using DC/DC converter to boosting and using DC/AC inverter output AC voltage. Conventional step-up utilizes a boost converter single power the have bear high voltage, large and reverse recovery current spike output diode; this decreases ratio to seven times ratio. Also, by using to boost voltage, winding ratio will limit range; if leakage induction is not effectively dealt with, conversion efficiency will To solve the present invention utilizes a conversion circuit using induction energy transfer proposed reference [7]; it has high boost ratio and fair efficiency, to thirty DC/DC power conversion. stabilize power output solar energy system, invention controls inverter a control problem, due to parameters changing various conditions, variety control theories have proposed,
 technology has brought many cOnvenienceS in daIly LivEs, And aT the Same time variouS ProbLems, such as, reduction in tHe mouNt OF fosSIl Fuel, cAusing hIGhER PriCe AnD enErGY cRisis; New Energy sOurce develOpmEnT becomes incrEAsIngly imporTanT. New energy soUrcE has leSs ImpACt on eNviRonmeNt and lESs pollUtion to thE aIR and waTEr. More iMPOrTantLy, these kinds of eneRGy ARe reusable and iNexhauStIBlE. rEneWabLe energy inClUdes sOLar enerGY, wIND, TheRMal energy, oceaN and water enERgy Etc [1, 2]. SolAr PowER becomEs heaTeD ResEarch area duE to iTs cleanneSs and rEAdily avAIlable aNd many ConFigUratIOnS hAve BeEN deVElOpeD. solAr energy CoNvErsioN sysTEM PAralLel ConnEcted To utility-poweR grId usES soLar paNels tO conVeRt solAr enerGy to Dc cUrrent, then uses pOwer ConditionEr tO cOnvErT DC to ac, which Is fEd iNto utilIty-poweR GriD [3,4]. THE SYsTem usually includes dC INPuT source, pOwer coNDiTiONer, distrIbUtiOn boX, TRansfOrmeR AnD rechargEable bATtErIes. The pOwEr condItIonEr iS consISt of dC/DC coNverter, Dc/AC inVErter and system COntroller, and mAY vARY dEPendIng On different ApplICatiOns. BECaUse OUtput VoltaGe OF a SOlar panel is relativeLy Low, conVentiOnal method useS series conNECTion to foRm reQUiREd output voltagE on DC Bus bar. HoweVEr, the volTage cAn be easiLy affecteD BY varying LoaD, maKinG it DIFfIcult to design SUBseqUeNt stage InvErter anD deGraDinG poWeR quality. FUrthermoRe, If OnE mOduLe in tHE series dOeS noT wOrk In optIMum conDitioN, the WhOlE SysTem's effICiENCy wiLl Be SuffEreD. THerefOre, tWO-stAge convErsion metHod IS usuAlLy Used to aChieve AC power OuTput, first uSiNg Dc/DC conVERter to boOsting input voltage and thEN using Dc/AC InverTer tO output AC VolTage.
CoNveNTional dC/DC stEp-up cIrCuiT UTilizES A bOosT cOnverter wiTH A siNgle iNdUctoR; power sEmiconductor switchES in The circuit havE to Bear HIGh VolTAgE, LarGe CUrrENT and reverse recoVery currenT sPIkE in output dIOde; ThIs decreAses conVersiON efficiEncy and liMits boost RaTio tO SEveN times ratiO. Also, by uSing transFOrmer TO bOost vOltAge, winDiNg rAtio wIll limIT boOstinG range; If LeakagE induCtIon is not Effectively dealt with, conVersioN effiCieNcy will suFfeR. to sOlve the prObleM, the presenT inVenTion uTilIZes a cOnveRSiOn cIRcuit UsinG Bi-directiONaL inDUCtIon energy trANSFer PropoSed IN referEnce [7]; It has high boost ratIO and fair converSion EFFicIenCY, up tO tHirty times DC/DC PowEr CONversion.
to Stabilize poWer outpuT fROm solAr enerGy systEm, the prESEnT InventIon cOntRols the inVerTeR By a micrOpRoCEssor. TO solVe ControL problEM, due TO Parameters changiNg and VARious UNdeTermiNaBle condITionS, variety coNtrol theoriEs have Been PropoSed, such As
 technology has brought ma ny conveni ences  in  da il y li ves,  and at the sa m e ti me various problems, s uch a s, redu c ti on in  the mo u nt o f f os si l f ue l ,causi nghigherprice andene rg y crisis; ne w  e nergy sour cedevelopmentbec omes i nc rea s ingly  im porta nt. Ne w  energ y sourceha s  lessi mpact o n en viro nment and less po l lu t ion to the air  and w at e r. M ore  im portantly,  t hesek inds of en e r g y a r e reusable an d inexhaust i ble . Rene wa ble energy  incl ud e s s olar energy , wi nd, therm al ene r gy, oce a n and w ater e ner gyetc[ 1,  2 ].So l arp ow erb eco mes heat ed  r esear ch a r e a duetoitsclean ness and read ily  ava i lab le an d man y co nf igura tionshavebe en developed. S olar  energy c onv er sio nsyste m  paral lel  co nnected  to uti l ity -p o w e rgrid uses solar pa ne l s  t o conver t sola r  e ne r gy to DC  c urr ent, t hen u sesp ow er condi tioner to  c onvertDC  to AC ,whi chis fe d  int o util ity-powe r gri d  [3,4]. The sy s tem usually i n cl u d es DC i npu t source, p ower cond itio n er , d i strib ution  b o x, transformer and rec ha rgeabl e bat teries. The p ower condi t i o ner is c onsi s to f DC/DC conver ter,DC/AC inve r ter andsyste m contro ller, and m ay varydep end ing  on d if ferent applic a t ions .Because  ou tput vo lta geofa s ol ar panelis relat iv el ylo w,conve n tional m et hod  u ses  seri e s conn ectio n to  f or m  re quiredo ut p u t vo lt ag e on  DC  b us ba r. H o wev er, the  voltagecan be e as il y affec ted by varyin gload, maki ng  it  diffi c u lt to de sign subsequent stage i n verterand  degr adin g power q ual ity. F urt h ermore , if o ne mo du lei n  thes e ri esdo es not wor k inoptim um  con dition,  the whole system' s  ef ficiency will  be  suf f e re d.T he r efo re ,  tw o - stage conversio n method i su su ally usedt o a ch ieve AC  poweroutpu t , first  using DC /DC conve rt er t o boo sting inpu t voltag e and the n  usin g  D C/ACinv erterto  ou tputAC vol t age .
Con ventio na l DC/D C ste p- up circu it utilizes a boost con verter  with  asingle in duc t or;  power se mico nductor sw itc hes  in t hec ircui t ha v etob ear h ighv oltage, l a rg e c u r re nt and reve r s e  re cover y c u rrentspik e in output diode ;  this decrease s co n v ers ion effi ci ency and limit s b oo s t  ratio t oseven times  ratio.Al s o, by  using  trans formert o  b o ost vo ltag e,winding r ati ow ill lim it  b o osting  ran ge ; if l eakage indu c t ion is not effec tivel y dealt wit h, co nv ersione ffic iency will  suffer. To  solve  the  prob lem, th epresen t i nv ention uti l izes a co nvers ion cir cu it u sin g bi-d irec t i onalindu ct ion  energy t r a ns f er  p r opo sedin re fe renc e [7]; it has high  bo o st rati oand f air co n ve r s ion effici enc y, up t o thirty t i mesD C/ D C pow er con versio n.
To s t abi li ze powe r o u t put fromsolar ene r gysy stem , the pr es entin ven ti on controls the  inverte r by a m i c roproc ess o r. T o  solve  c ontrol probl em, d ue to para m e ter s chang i ngand  va riou s u ndet e rminable conditions, var iety  cont r oltheor ies h av e been p r opos ed, such as
 technology_has brought_many conveniences in daily_lives, and_at_the same_time_various problems, such_as, reduction in_the mount of fossil_fuel, causing higher_price_and energy crisis; new energy source development becomes increasingly important. New energy source has_less_impact on_environment_and_less pollution to the air_and water. More importantly, these_kinds of_energy are reusable and inexhaustible. Renewable energy includes_solar_energy, wind, thermal_energy, ocean and water energy etc [1, 2]. Solar_power becomes heated research area due_to its cleanness_and_readily_available and many configurations_have been developed. Solar energy conversion_system parallel connected to utility-power grid_uses solar panels to convert solar energy_to DC current, then uses power_conditioner to convert DC to_AC, which_is fed into utility-power grid_[3,4]. The system_usually includes_DC input source,_power conditioner, distribution box, transformer and_rechargeable batteries. The_power conditioner is consist of DC/DC_converter,_DC/AC inverter and_system_controller,_and may_vary depending on_different_applications. Because_output_voltage of a solar panel is_relatively_low, conventional method uses series connection to_form required output voltage_on_DC bus bar. However,_the voltage can be easily_affected by varying load, making it_difficult to_design subsequent_stage inverter and degrading power quality. Furthermore, if one module in_the series does not work in_optimum condition, the whole_system's efficiency_will_be suffered. Therefore,_two-stage_conversion method_is usually used to achieve AC power_output, first_using DC/DC converter to boosting input_voltage and then using_DC/AC_inverter to output AC voltage.
Conventional DC/DC_step-up circuit utilizes a boost converter_with a single inductor; power_semiconductor_switches_in the circuit have to_bear high voltage, large current and_reverse recovery current_spike in output diode; this decreases conversion_efficiency_and limits boost ratio to seven_times_ratio. Also, by using transformer to_boost_voltage,_winding ratio will limit boosting_range; if leakage induction is not_effectively dealt with, conversion efficiency will suffer. To solve_the problem, the_present invention utilizes a conversion_circuit_using_bi-directional induction energy transfer proposed in reference [7]; it has_high boost_ratio and fair_conversion efficiency, up to thirty times DC/DC power conversion.
To stabilize_power output from solar energy system, the_present invention controls the inverter by a microprocessor. To solve control_problem, due to parameters changing and various undeterminable_conditions, variety control theories have been proposed,_such as