Partially isolated quasi-switched boost integrated and fully isolated three port DC-DC resonant converters for DC microgrid

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dc.contributor.authorRastogi, Praneydeep
dc.contributor.supervisorBhat, Ashoka Krishna Sarpangal
dc.date.accessioned2022-03-23T22:04:23Z
dc.date.copyright2022en_US
dc.date.issued2022-03-23
dc.degree.departmentDepartment of Electrical and Computer Engineeringen_US
dc.degree.levelDoctor of Philosophy Ph.D.en_US
dc.description.abstractEnvironmental challenges have popularized the use of renewable energy sources as a credible source of energy. The integration of renewable energy source, energy storage device such as battery and the load has led to the concept of microgrid and when the microgrid contains the local DC distribution network, it is known as DC microgrid. DC microgrid has multiple power conversion stages which can work in a stand-alone condition serving the local energy needs. But multiple power conversion stages lead to complexity and affects the overall system efficiency. To mitigate this problem, multi-port converters or converter systems are used. A three-port converter is a type of multi-port converter system which integrates energy source, storage device and the DC load. This DC load can be a DC bus or the external load. This very three port converter system inspired the work of this dissertation. Furthermore, due to lack of any work on the quasi-switched boost operation with three port partially isolated DC-DC converters which use the resonant network such as LCL and LCL-T type networks guided this dissertation towards this particular research area. Other than partially isolated three port converter, the fully isolated three port DC-DC converter has also been focussed upon. The dissertation starts with the DC microgrid description and the literature has been reviewed to recognize the power converters which are/can be used for DC microgrid application. This review was able to spot the specific research gap where there is absence of any quasi-switched boost integrated three port partially isolated resonant network topology as mentioned above, so a new quasi boost integrated three port partially isolated high frequency transformer isolated fixed frequency LCL resonant network DC-DC converter has been proposed in Chapter 3 along with the gating scheme which provides the quasi-switched boost operation and the required power flow among the ports during different modes of operation. The detailed operation, analysis, design and PSIM simulations are provided with an example of 500 W converter with 200 V DC output having 2 V- 24 V input voltage for RES (port 1) and 9 V – 12 V ESD (port 2) to gain an insight of the performance of the new topology. The important design formulae have been derived. Additionally, loss analysis has also been done. During performance evaluation the partial soft switching operation has been observed along with the quasi-boost operation for a low voltage rating input sources which has an effective power flow for a three-port conversion. The output DC voltage has also been regulated effectively and the ZCS turn on and turn off for the diodes of the output rectifier bridge were maintained during the full operation. This topology can provide an effective way of integrating the RES, ESD and the load for the DC microgrid application. In Chapter 4, another topology has been proposed which uses the above-mentioned quasi-switched boost operation but with a different resonant network, i.e., LCL-T type network and with a new gating scheme which has been derived from the gating scheme proposed in Chapter 3. This gating scheme with the LCL-T type resonant network provides the quasi-switched boost operation for partially isolated high frequency transformer isolated DC-DC converter. It also regulates the output DC voltage and facilitates partial soft switching. It also provides the additional soft switching operation, i.e., ZVS turn off for the two switches which get turned on to provide the quasi-boost operation during the shoot through state. The ZCS turn on and turn off for the diodes of the output rectifier bridge were also maintained. In this case also, the detailed operation, analysis, design and PSIM simulations are provided with the same example as given in Chapter 3 along with derivation of important formulae and design equations. This topology can prove to be a good candidate for DC microgrid applications. In Chapter 5, the fully isolated three port high frequency transformer isolated fixed frequency LCL and LCL-T resonant network-based DC-DC converter has been proposed. This topology has been proposed to have RES and ESD ports isolated from a load port by using a three-winding transformer. The modified gating scheme has been used to provide the power flow and voltage regulation. This converter system has shown the soft switching operation ZVS turn on/ZCS turn off for the switches in different modes of operation. The proposed gating scheme provided the three parametric control out of which two were controlled for three port power flow and regulated output DC voltage. The use of LCL-T on ESD provided the voltage gain greater than 1. Furthermore, the detailed operation, analysis, design and PSIM simulations are provided with an example of 500 W converter with 200 V DC output having 35 V- 48 V input voltage for RES (port 1) and 33 V – 36 V ESD (port 2) along with derivation of important formulae for active power flow and design equations. This topology with the proposed gating scheme shown the good voltage regulation and power flow which can provide the three-port conversion for the DC microgrid. The research work has been concluded with clear stating of major and minor contributions in Chapter 6 which ended with some suggestions for future work.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/13807
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectFully isolated three porten_US
dc.subjectPartially isolated three porten_US
dc.subjectResonant dc-dc convertersen_US
dc.subjectQuasi-switched boost integrateden_US
dc.subjectDC microgriden_US
dc.subjectGating schemesen_US
dc.titlePartially isolated quasi-switched boost integrated and fully isolated three port DC-DC resonant converters for DC microgriden_US
dc.typeThesisen_US

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