Danyang Bao

Bio: Danyang Bao is an academic researcher from Shenzhen Polytechnic. The author has contributed to research in topics: Inductor & Voltage. The author has an hindex of 2, co-authored 4 publications receiving 12 citations.

Switched Inductor Double Switch High Gain DC-DC Converter for Renewable Applications

Abstract: High voltage gain DC-DC converter is a prime requirement for renewable applications, in particular for PV. Though numerous DC-DC converter is available for increasing the voltage gain, the passive elements requirement is higher which reduces the compactness, consequently, increases the cost of the system. To address this issue, a high gain DC-DC converter is reported recently. However, the number of passive elements is quite high which increases the size. To reduce the number of passive elements and maintain the same number of semiconductor devices, in this paper, a new switched inductor arrangement is proposed which is named as switched inductor double switch DC-DC converter (SL-DS-DC). Moreover, the proposed converter has a higher gain as compared to the recently reported converter. The proposed converter is analyzed in steady state and a comparative analysis is presented to prove the suitability. Finally, the proposed converter is validated experimentally.

A High Voltage Gain DC–DC Converter With Common Grounding for Fuel Cell Vehicle

Abstract: The essential features of a DC–DC converter for fuel cell vehicle are to ensure the higher voltage gain to meet out the higher DC link voltage demand, continuous input current to improve the life span of the fuel cell, presence of common grounding to avoid electromagnetic interference issue and lower voltage stress with reduced components. This paper presents a high voltage gain DC–DC converter by combining the switched capacitor and quasi switched boost network modules. The proposed high voltage gain converter provides the continuous input current, lower voltage stress, utilizes a fewer number of elements and common grounding feature. The operating characteristics, steady-state analysis both in continuous current mode (CCM) and discontinuous current mode (DCM), comparative analysis with contemporary converters are discussed. The theoretical claimed analysis is validated by the simulation and experimental study. The proposed converter is operated for 200 W output power rating and tested for providing the voltage gain in the range of 5–8 times the input voltage gain by varying the input voltage from 25 V–40 V. The efficiency of the proposed converter is also reported for different output power rating which is in the range 91.3%–93.7%.

Integrated-Power-Control-Strategy-Based Electrolytic Capacitor-Less Back-to-Back Converter for Variable Frequency Speed Control System

Abstract: This article presents an integrated power control strategy (IPCS) for a variable frequency speed regulation system, which consists of a back-to-back converter and a small film dc-link capacitor. Due to the lack of large-capacity energy storage components in the dc bus, there is a strong power coupling between the rectifier and the inverter. The dynamic response is limited and dc-link voltage oscillates because the traditional method controls rectification and inversion separately. The IPCS is proposed to achieve dynamic balance of the system power through synchronous control of the rectifier and inverter. High conversion efficiency guarantees the power balance of the rectifier and inverter meanwhile reduces the dc bus voltage ripple. To further reduce the dc-link voltage ripple and maintain the stability of the dc-link voltage under step changes of load, a virtual inertia control method is proposed, which consists of a virtual resistance control block and a virtual capacitor control block. As a result, the dc-link voltage ripple and the total harmonic distortion of the dc-link current can be improved. Simulations and experimental results are given to provide further validation of the proposed IPCS under different operating scenarios.

Comparative Analysis of Extended SC-qSBI With EB-QZSI and EB/ASN-QZSI

Abstract: The motivation of this paper is to bring into notice the establishment of two topologies: enhanced boost-quasi Z source inverter (EB-QZSI) and enhanced boost QZSI with an active switched network (EB/ASN-QZSI) which have poor performance than Extended switched capacitor quasi switched boost inverter (ESC-qSBI). However, ESC-qSBI has been developed before the EB-QZSI and EB/ASN-QZSI. The ESC-qSBI utilizes lesser number of inductors than the enhanced boost-quasi Z source inverter (EB-QZSI) and enhanced boost QZSI with an active switched network (EB/ASN-QZSI). In the presence of parasitics, ESC-qSBI has higher voltage gain than the EB-QZSI and EB/ASN-QZSI. Additionally, EB/ASC-QZSI has lower total voltage stress across diodes and capacitors as compared to EB-QZSI and EB/ASN-QZSI. The operation, steady state analysis, comparison and experimental analysis are discussed to prove the superorrity of ESC-qSBI over EB-QZSI and EB/ASN-QZSI.

Switched Inductor Double Switch High Gain DC-DC Converter for Renewable Applications

Abstract: High voltage gain DC-DC converter is a prime requirement for renewable applications, in particular for PV. Though numerous DC-DC converter is available for increasing the voltage gain, the passive elements requirement is higher which reduces the compactness, consequently, increases the cost of the system. To address this issue, a high gain DC-DC converter is reported recently. However, the number of passive elements is quite high which increases the size. To reduce the number of passive elements and maintain the same number of semiconductor devices, in this paper, a new switched inductor arrangement is proposed which is named as switched inductor double switch DC-DC converter (SL-DS-DC). Moreover, the proposed converter has a higher gain as compared to the recently reported converter. The proposed converter is analyzed in steady state and a comparative analysis is presented to prove the suitability. Finally, the proposed converter is validated experimentally.

A New Transformerless Ultra High Gain DC–DC Converter for DC Microgrid Application

Abstract: High gain dc-dc converters are used in several applications which include solar photovoltaic system, switch-mode power supplies and fuel cells. In this paper, an ultra-high gain dc-dc boost converter is proposed and analyzed in detail. The converter has a gain of six times as compared with the boost converter. The high gain is achieved by utilizing switched inductors and switched capacitors. A modified voltage multiplier cell (VMC) with switched inductors is proposed. The converter has a single switch which makes its operation easy. Moreover, the voltage across the switch, diodes and capacitors are less than the output voltage which increases the overall efficiency of the converter. The converter performance in steady-state is analyzed in detail and it is compared with other latest high gain converters. The working of the converter in non-ideal conditions is also discussed in detail. The loss analysis is done using PLECS software by incorporating the real models of switches and diodes from the datasheet. To confirm and validate the working of the proposed converter a hardware prototype of 200 W is developed in the laboratory. The converter achieves high gain at low duty ratios and its performance is found to be good in open and closed loop conditions.

Dual Output and High Voltage Gain DC-DC Converter for PV and Fuel Cell Generators Connected to DC Bipolar Microgrids

Abstract: This paper introduces a new topology for a DC-DC converter with bipolar output and high voltage gain. The topology was designed with the aim to use only one active power switch. Besides the bipolar multiport output and high voltage gain this converter has another important feature, namely, it has a continuous input current. Due to the self-balancing bipolar outputs, the proposed topology is suitable for bipolar DC microgrids. Indeed, the topology balancing capability can achieve the two symmetrical voltage poles of bipolar DC microgrids. Furthermore, it is possible to create a midpoint in the output of the converter that can be directly connected to the ground of the DC power supply, avoiding common-mode leakage currents in critical applications such as transformerless grid-connect PV systems. The operating principle of the proposed topology will be supported by mathematical analysis. To validate and verify the characteristics of the presented topology, several experimental results are shown.

Multi-Stage DC-DC Converter Using Active LC2D Network With Minimum Component

Abstract: A multi-stage ultra-gain converter using minimum component including a single semiconductor switch is proposed. The proposed converter is formulated using an active inductor-capacitor-two diodes (LC2D) network. The basic structure of the converter called as a cubic gain converter is formulated using twelve components including a semiconductor switch. The operation of the converter is discussed for continuous and discontinuous modes of operations. The converter performance due to the parasitic elements is discussed, and the SiC-based semiconductor devices are selected to reduce the effect of parasitic elements. A 250 W, 50 kHz cubic gain converter prototype is made and the test results are recorded. The results prove that the operation of the cubic gain converter in low duty ratio helps to attain 91.6% efficiency. The proposed structure of the ${n}$ -stage and the detailed analysis of the cubic gain converter are the major novelties and contributions of this brief.

High-Voltage-Gain Soft-Switching Converter Employing Bidirectional Switch for Fuel-Cell Vehicles

Abstract: Conventional current-fed resonant converter suffers from high turn-off loss over wide range of fuel-cell voltage. To alleviate this problem, we propose high voltage gain current-fed resonant converter that achieves almost ZVS turn-off over a wide range of voltage gain. By employing a bidirectional switch across center nodes of the voltage doubler and corresponding modulation, the presented converter achieved almost ZVS at the turn-off instant; this trait significantly increases the power conversion efficiency even under high frequency operation. The inherent boost function of the current doubler, an additional boosting operation using a bidirectional switch, and double boosting of the voltage doubler enable the presented converter to achieve high voltage gain without having to use a transformer that has a high turns-ratio. Moreover, 180 $^\circ$ phase interleaving reduces the input current ripple to zero. The steady-state operation is analyzed comprehensively, and design considerations of the proposed converter are given. Finally, a prototype with input of 48-72 V, output of 380 V, and rated power of 1 kW is developed to validate the effectiveness and feasibility of the proposed converter.