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Arabian Journal for Science and Engineering

, Volume 44, Issue 8, pp 6769–6781 | Cite as

Integrating SCESS into a Ship-PV Power System to Mitigate Power Fluctuations and Improve LVRT Capability

  • Yuanchao Qiu
  • Chengqing YuanEmail author
  • Jinrui Tang
Research Article - Electrical Engineering
  • 50 Downloads

Abstract

Because of the intermittence of PV power generation and the peculiarities of the ship power system, the integration of a PV system into a ship grid must adopt an ESS or available control strategy to smooth the fluctuating grid-connected power and enhance the LVRT capability of the PV power system. This paper proposes a novel model to smooth the grid-connected power and improve the LVRT capability by using an SCESS. In addition, a comprehensive control strategy is designed to achieve the power scheduling between the PV and SCESS and to overcome the problems of DC-link overvoltage and AC overcurrent that may cause disconnection or damage to the inverter. The dynamic behaviours of the system are investigated by considering various scenarios, such as varying irradiance and different levels of voltage drop. The results confirm the effectiveness of the proposed model in limiting the DC bus voltage, smoothing the grid-connected power and enhancing the LVRT capability by PSCAD/EMTDC simulation of a 143-kW ship-PV power system.

Keywords

Hybrid ship/PV/SC power system Supercapacitor energy storage system LVRT Smoothing grid-connected power 

List of symbols

Abbreviations

BESSs

Battery energy storage systems

DG

Diesel generator

ESS

Energy storage system

LVRT

Low voltage ride through

MPPT

Maximum power point tracking

P&O

Perturbation and observation

PCC

Point of common connection

PV

Photovoltaic

SC

Supercapacitor

SCESSs

Supercapacitor energy storage systems

SoC

State of charge

Notations

\(C_{\mathrm{dc}}\)

DC bus capacitor

D

Duty cycle of the bidirectional buck/boost converter

\(e_{\mathrm{g}}\)

Band-gap energy of the solar cell material

\(f_{\mathrm{s}}\)

Switching frequency of the bidirectional buck/boost converter

\(G, T_{c}\)

Actual solar irradiance and temperature

\(G_{\mathrm{R}}\), \(T_{\mathrm{cR}}\)

Reference solar irradiance and cell temperature

\(i_{{d}}\),\( i_{{q}}\)

Active and reactive current at PCC

\(i_{\mathrm{L}}\)

Current that passing through the \(L_{\mathrm{sc}}\)

\(I_{\mathrm{oR}}\)

Dark current at the reference temperature

\(I_{\mathrm{scR}}\)

Short-circuit current at \(G_{\mathrm{R}}\) and \(T_{\mathrm{cR}}\)

k

Boltzmann constant

\(L_{\mathrm{sc}}\)

Energy-storage inductance

\(L_{\mathrm{sc}}\)

Energy-storage inductance

n

Diode ideality factor

\(P_{\mathrm{inv}\_\mathrm{out}}\)

PV inverter output power

\(P_{\mathrm{loss}}\)

Loss power of the SC

\(P_{\mathrm{PV}}\)

Output power of PV

\(P_{\mathrm{sc}}\)

Instantaneous active power expression of the SC

\(P_{\mathrm{T}}\),\( Q_{\mathrm{T}}\)

Active and reactive powers at PCC

q

Electron charge

\(R_{\mathrm{EP}}\)

Equivalent inner resistance of the SC

\(R_{\mathrm{ES}}\)

Equivalent parallel resistance of the SC

\(t_{\mathrm{sc}}\)

Charge or discharge duration of the SCESS

\(u_{{d}}\), \(u_{q}\)

Active and reactive voltage at PCC

\(V_{\mathrm{dc}}\)

Rated DC bus voltage

\(V_{\mathrm{MPP}}\)

Maximum power point voltage

\(V_{\mathrm{PV}, }I_{\mathrm{PV}}\)

Photovoltaic source output voltage and current

\(V_{\mathrm{sc}\_\mathrm{rated}}\), \(V_{\mathrm{min}}\)

Rated voltage and discharge cut-off voltage of the SC

\(\Delta I_{\mathrm{scp}}\)

Maximum allowable ripple current

Greek symbols

\(\alpha \)

Temperature coefficient of the PV current

\(\theta \)

Instantaneous angle of the PCC voltage

\(\lambda \)

Power variation rate allowed by ship classification society

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Notes

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51422507).

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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  1. 1.School of Energy and Power EngineeringWuhan University of TechnologyWuhanChina

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