Implementation and control of Switched Boost Inverer for DC nanogrid applications

Switched boost inverter (SBI) is a single stage power converter that can supply both dc and ac loads simultaneously. Unlike the traditional buck type voltage source inverter (VSI), the SBI can produce an ac output voltage that is either greater or less than the available dc input voltage. Also, the SBI exhibits better EMI noise immunity when compared to the VSI. These features make the SBI suitable for microgrid and nanogrid applications. In this paper, the SBI is proposed as a power electronic interface in DC nanogrid. The structure and advantages of the proposed SBI based DC nanogrid are discussed in detail. A closed loop control system is also designed for the SBI supplying both DC and AC loads using Synchronous Reference Frame (SRF) approach, and it is implemented in digital domain using Texas Instruments TMS320F28335 Digital Signal Processor (DSP). The control system of SBI has been experimentally validated using a 0.5 kW experimental prototype of SBI supplying both DC and AC loads, and the relevant experimental results are presented in the paper. The experimental results show that the DSP based control system shows excellent performance under the steady state as well as during the transients in either DC or AC loads in the system. The low cross regulation of the control system has also been verified for a step change in either DC or AC load of SBI. These experimental results confirm the suitability of the SBI and its closed loop control strategy for DC nanogrid applications.

[1]  Thomas A. Lipo,et al.  Pulse Width Modulation for Power Converters: Principles and Practice , 2003 .

[2]  Dushan Boroyevich,et al.  Future electronic power distribution systems a contemplative view , 2010, 2010 12th International Conference on Optimization of Electrical and Electronic Equipment.

[3]  Avinash Joshi,et al.  Switched-boost inverter based on Inverse Watkins-Johnson topology , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[4]  M. Aredes,et al.  A DQ Synchronous Reference Frame Current Control for Single-Phase Converters , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[5]  F.Z. Peng,et al.  Maximum boost control of the Z-source inverter , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[6]  Shaojun Xie,et al.  Pulsewidth Modulation of Z-Source Inverters With Minimum Inductor Current Ripple , 2014, IEEE Transactions on Industrial Electronics.

[7]  Fang Zheng Peng Z-source inverter , 2002 .

[8]  Richard Duke,et al.  DC-Bus Signaling: A Distributed Control Strategy for a Hybrid Renewable Nanogrid , 2006, IEEE Transactions on Industrial Electronics.

[9]  Hiroaki Kakigano,et al.  Low-Voltage Bipolar-Type DC Microgrid for Super High Quality Distribution , 2010, IEEE Transactions on Power Electronics.

[10]  Poh Chiang Loh,et al.  Pulse-width modulation of Z-source inverters , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[11]  Remus Teodorescu,et al.  A New Single-Phase PLL Structure Based on Second Order Generalized Integrator , 2006 .

[12]  Santanu Mishra,et al.  Inverse Watkins–Johnson Topology-Based Inverter , 2012, IEEE Transactions on Power Electronics.

[13]  Avinash Joshi,et al.  A PWM control strategy for switched boost inverter , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[14]  Holmes,et al.  Pulse width modulation for power converters , 2003 .

[15]  Fang Zheng Peng,et al.  Dead-Time Elimination for Voltage Source Inverters , 2008, IEEE Transactions on Power Electronics.

[16]  Marco Liserre,et al.  New Positive-sequence Voltage Detector for Grid Synchronization of Power Converters under Faulty Grid Conditions , 2006 .

[17]  Jin Wang,et al.  Constant boost control of the Z-source inverter to minimize current ripple and voltage stress , 2006, IEEE Transactions on Industry Applications.