An active damping scheme of the voltage-source converter driving the induction machine damping unit for mitigating subsynchronous oscillation in power systems

2015 ◽  
Author(s):  
Shen Wang ◽  
Zheng Xu
Keyword(s):  
Power Systems ◽  
Induction Machine ◽  
Active Damping ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Subsynchronous Oscillation

scholarly journals Suppressing Conducted DM EMI in an Active Power Filter via Periodic Carrier Frequency Modulation

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1903 ◽  
Author(s):  
Shengbao Yu ◽  
Nan Chen ◽  
Lihui Gao ◽  
Haigen Zhou ◽  
Yong Huang
Keyword(s):  
Power Systems ◽  
Frequency Modulation ◽  
Carrier Frequency ◽  
Electromagnetic Interference ◽  
Double Fourier Series ◽  
Active Power ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Nonlinear Load ◽  
Suppression Effect

Active power filters (APF) aim at solving the harmonic problem originated by the nonlinear load in power systems. However, the high dv/dt and di/dt outputs from power electronic devices in a voltage source converter on APF introduced unwanted conducted electromagnetic interference (EMI) when compensating for the low-frequency harmonic components. Hence, this paper develops a spectrum analysis approach to investigate and quantify the source differential-mode (DM) voltage of a single-phase shunt APF to suppress the DM EMI via periodic carrier frequency modulation (PCFM). In this scheme, the analytical expressions of source DM voltage in the APF using the PCFM scheme are obtained with a double Fourier series. In addition, the influence of PCFM parameters on the source DM voltage spectrum is predicted based on the analytical expression. As a result, the PCFM parameters, which have the best suppression effect on the DM EMI are obtained. The experiment results proved the validity of the sawtooth PCFM APF with the maximum frequency deviation equal to 800 Hz in alleviating the APF DM EMI.

scholarly journals Optimal Power Flow With Emerged Technologies of Voltage Source Converter Stations in Meshed Power Systems

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 166963-166979 ◽  
Author(s):  
Ehab E. Elattar ◽  
Abdullah M. Shaheen ◽  
Abdallah M. Elsayed ◽  
Ragab A. El-Sehiemy
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Optimal Power Flow ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Optimal Power

scholarly journals Quasi-Z-Source Inverter-Based Photovoltaic Power System Modeling for Grid Stability Studies

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 508
Author(s):  
Lluís Monjo ◽  
Luis Sainz ◽  
Juan José Mesas ◽  
Joaquín Pedra
Keyword(s):  
Power Systems ◽  
Power System ◽  
System Modeling ◽  
Power Conversion ◽  
System Stability ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Stability Problems ◽  
Sensitivity Studies ◽  
And Control

Quasi-Z-source inverters (qZSIs) are becoming a powerful power conversion technology in photovoltaic (PV) power systems because they allow energy power conversion in a single stage operation. However, they can cause system resonances and reduce system damping, which may lead to instabilities. These stability problems are well known in grid-connected voltage source converter systems but not in quasi-Z-source inverter (qZSI)-based PV power systems. This paper contributes with Matlab/Simulink and PSCAD/EMTDC models of qZSI-based PV power systems to analyze transient interactions and stability problems. These models consider all power circuits and control blocks of qZSI-based PV power systems and can be used in sensitivity studies on the influence of system parameters on stability. PV power system stability is assessed from the proposed models. The causes of instabilities are analyzed from numerical simulations and possible solutions are proposed.

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