Dual-Input Photovoltaic System Based on Parallel Z-Source Inverters
Abstract
:1. Introduction
- (1)
- Less time and cost are needed for developing the high-power PV system; also, it is more flexible.
- (2)
- It is more reliable because if the DC/AC converter is interrupted in the centralized structure, the whole system will interrupt.
- -
- Using parallel ZSIs as single-stage power conversion system for multi-string PV systems.
- -
- Proposing an effective control to perform MPPT and to inject high-quality current to the grid.
- -
- Suggesting enhanced dual-string maximum power point tracking (eDS-MPPT) to reduce computational burden and to remove the need for using PV strings voltage sensors.
2. Proposed Topology
3. Proposed Control Method
3.1. Controlling Power Delivered to the Grid
3.1.1. Inner Current Control Loop
3.1.2. Voltage Controller of the ZSI Capacitor
3.2. Proposed MPPT Method
4. Simulation Results
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
Nomenclature
AC | Alternating current |
B | The boost coefficient |
L | Inductor of Z-source network |
C | Capacitor of Z-source network |
CW | Carrier wave |
D0 | Shoot-through duty cycle |
DC | Direct Current |
i | Current of the converter in AC side |
irms | Current of the grid |
Iin | Input current of inverter bridge |
G | ZSI gain |
k | MPPT tracking coefficient |
kpdc | Integral gain of capacitor voltage controller |
kp | Proportional gain of current controller |
kpdc | Proportional gain of capacitor voltage controller |
ki | Resonant gain of current controller |
M | Modulation index of inverter |
MPP | Maximum power point |
MPPT | Maximum power point tracking |
Lf1, Lf2 | Inductor of L filters |
P | Active power injected by the inverter to the grid |
PR | Proportional-resonant controller |
Q | Reactive power injected by the inverter to the grid |
S1, S2, S3, S4 | Semiconductor switches |
s | Laplace operator |
SB-PWM | Simple Boost Pulse Width Modulation |
T0 | Shoot-through vector interval |
T | Switching period |
u1, u2 | Inverter output voltage |
uin1, uin2 | Inverter DC link voltage |
Usc | Shoot-through signal |
Vref | Reference of switching modulator |
Vpv1, Vpv2 | PV strings voltages |
Vg | Grid voltage |
ωo | Fundamental resonant frequency in rad/s |
Subscripts and Superscripts
1, 2 | ZSI 1 and 2 |
C | Capacitor of Z-source network |
i | ZSI’s number indicator |
L | Inductor of Z-source network |
in | DC link of inverter |
g | Grid |
max | Maximum |
MPP | Maximum power point |
pv | PV string |
rms | RMS |
* | Reference |
^ | Calculated value |
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Parameter | Symbol | Value |
---|---|---|
Inductor of Z-source network | L | 2 mH |
Capacitor of Z-source network | C | 2200 uF |
Parameter | Symbol | Value |
---|---|---|
Current at maximum power | IMP | 15.22 A |
Voltage at maximum power | VMP | 105.2 V |
Maximum power | Pmax,e | 1600 W |
Short circuit current | Isc | 16.42 A |
Open circuit voltage | Voc | 131.6 V |
Temperture coefficient of Voc | KV | −0.123 V/K |
Temperture coefficient of Isc | KI | 0.0032 A/K |
Parameters | Symbol | Value | |
---|---|---|---|
Capacitor voltage controller | Proportional parameter | kpdc | 0.7 |
Integral parameters | kidc | 20 | |
Current controller | Proportional parameter | kp | 0.08 |
Resonant parameter | ki | 150 | |
eDS-MPPT tracker gain | parameter k | k | 0.95 |
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Shahparasti, M.; Savaghebi, M.; Adabi, E.; Ebel, T. Dual-Input Photovoltaic System Based on Parallel Z-Source Inverters. Designs 2020, 4, 51. https://doi.org/10.3390/designs4040051
Shahparasti M, Savaghebi M, Adabi E, Ebel T. Dual-Input Photovoltaic System Based on Parallel Z-Source Inverters. Designs. 2020; 4(4):51. https://doi.org/10.3390/designs4040051
Chicago/Turabian StyleShahparasti, Mahdi, Mehdi Savaghebi, Ebrahim Adabi, and Thomas Ebel. 2020. "Dual-Input Photovoltaic System Based on Parallel Z-Source Inverters" Designs 4, no. 4: 51. https://doi.org/10.3390/designs4040051