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MPSST Application for Cost-effective, Efficient and Reliable Emergency
Electrification of Field Hospitals
Mo Rashidi, PhD Candidate
Prof. Nasiri
Center for Sustainable Electrical Energy Systems
University of Wisconsin-Milwaukee
Spring, 2017
Center for Sustainable Electrical Energy Systems
Objectives and Motivation

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SST is a combination of PE converters and HF Transformer
HF Transformer reduce the size and weight of the converter dramatically
MPSST provides compact, integrated and galvanically isolated multi-port node for
microgirid elements
Having PE Transformer enables smart DC and/or DC distribution systems
MPSST helps fast efficient Volt-VAR regulation in distribution system
The suggested configuration includes three active bidirectional port for the generation
elements

V1
W1
G3
G1
V3
-

V2

W3
W2
G2
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W4

V4
-
Objectives and Motivation
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Reducing size and weight makes the implementation and maintenance process much
more easier and faster
The converter enables reliable and fast electrification for emergency cases like field
hospitals
50:1
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Application of MPSST in AC-DC Zonal Distribution System
Total size of the system decreases
A central controller controls the power
flow in each zone
This configuration enables modular
application of DER in the distribution
system
Efficiency and reliability increases due
to localized generation of a portion of
demand and MV power distribution
Increasing reliability and survivability
due to having localized DG sources
DC power distribution is enabled
using PE transformers
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Voltage and Current Control Strategy for MPSST
(pool of Power Method)
Control strategy is designed to generate 3 sets of gate signals for the active converters
The flowchart follows the defined priority for the between generation elements and the
storage limitations
The goal of the control strategy is to control expected parameters using the given
elements
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Voltage and Current Control Strategy for MPSST
(MIMO Transfer Matrix for MPSST)
Generation port voltages are the demanded current are the given parameters
The fed current of the ports and the load voltage are the expected elements to be controlled
Considering the converter as a black 4-port multi input-multi output system the transfer
matrix for the system is calculated
𝒊1
𝐴11 𝐴12
𝒊2
𝐴21 𝐴22
=
𝒊3
𝐴31 𝐴32
𝒗4
𝐴41 𝐴42
i1
HF DC/AC
Inverter
i1
Cr
𝒗1
𝒗2
𝒗3
𝒊4
𝐴14
𝐴24
𝐴34
𝐴44
Z
Cr
Lr
Vac2
i3
i3
Lm
i2
i2
V2
HF
Multiwinding
Transformer
Vac1
V1
𝐴13
𝐴23
𝐴33
𝐴43
V3
Vac3
i4
i4
Vac4
+
V4
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Simulation Results
 Each set gate signal includes the duty ratio and phase shift for the converter to control
voltage and current based the flowchart and transfer matrix
D=0.0000053sec
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D=0.0000059sec
7
Simulation Results
 Each set gate signal includes the duty ratio and phase shift for the converter to control
voltage and current based the flowchart and transfer matrix
Kirchhoff's
Law
AC Load
SST
SSPD
DC Load
SSPD
Battery
Our Control
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8
Thank You
Center for Sustainable Electrical Energy Systems