New numerical techniques for bifurcation analysis of power systems with application to grid-connected voltage source converter

2011 ◽  
Vol 22 (5) ◽  
pp. 704-720 ◽  
Author(s):  
Stijn Cole ◽  
Kailash Srivastava ◽  
Muhamad Reza ◽  
Ronnie Belmans
Keyword(s):  
Power Systems ◽  
Bifurcation Analysis ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Numerical Techniques

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.

scholarly journals Design Methodology for Interfacing DERs to Power Systems through VSC

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
A. Valderrabano-Gonzalez ◽  
F. Beltran-Carbajal ◽  
R. Tapia-Olvera ◽  
O. Aguilar-Mejia ◽  
J. C. Rosas-Caro
Keyword(s):  
Power Systems ◽  
Control Variable ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Phase System ◽  
Reactive Component ◽  
Load Variations ◽  
Inductive Component ◽  
Main Input ◽  
Definition Of

This paper presents a methodology to connect distributed energy resources via an 84-pulse voltage source converter to three-phase system grid or load of standard or nonstandard voltage values. Transfer function blocks are included to illustrate interfacing among converters. The main input-output values to be considered in the application are detailed and the system can be modified to be included in other systems without loss of generality. The definition of the reactive component for supporting grid or load variations without degrading the overall performance is carried by for the DC-DC converter. A control variable for reducing the DC gain is used to improve the settling time. Our proposal defines the capacitive and inductive component values for an operating point and gives the option to reduce them when adding smoothed variations and adaptive controllers.

scholarly journals Comparison of cable models for time domain simulations

2017 ◽  
Author(s):  
W.Z. El-Khatib ◽  
Joachim Holbøll ◽  
Tonny W. Rasmussen ◽  
Stephan Vogel
Keyword(s):  
Power Systems ◽  
Large Scale ◽  
Offshore Wind ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Offshore Wind Power ◽  
Hvdc Transmission ◽  
High Voltage Direct Current ◽  
Wind Power Integration ◽  
Dc Fault

<p>This paper will look at dc cable transient modelling issues for voltage source converter (VSC) based high voltage direct current (HVDC) transmission systems,<br />which is getting evermore admired for large-scale offshore wind power integration. A simple mathematical π-equivalent cable model is presented and explained. The<br />model is compared to the detailed cable models with different degrees of accuracy found in PSCAD/EMTDC. The models are analyzed and tested using simulations of<br />dc fault conditions and energization. These studies are helpful for the protection system design of large-scale renewable energy power systems to realize a reliable multi-terminal dc transmission system for the future. </p>

scholarly journals Investigation on Dynamic Response of Grid-Tied VSC During Electromechanical Oscillations of Power Systems

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 94 ◽  
Author(s):  
Bo Wang ◽  
Guowei Cai ◽  
Deyou Yang ◽  
Lixin Wang ◽  
Zhiye Yu
Keyword(s):  
Power Systems ◽  
Dynamic Behavior ◽  
Reference Value ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Electromechanical Oscillations ◽  
Ac Power ◽  
Passive Response ◽  
Proposed Model ◽  
Operation Parameters

This study focuses on the dynamics of a grid-tied voltage source converter (GVSC) during electromechanical oscillations. A small-signal model with GVSC port variables (DC voltage and AC power) as the outputs and a terminal voltage vector as the input is derived to reveal the passive response of the GVSC on the basis of the power equation in the d–q coordinate system. An input–output transfer function matrix is constructed according to the proposed model. The frequency response of this matrix in the electromechanical bandwidth is described to reflect the dynamic behavior of the GVSC. The effects of the operation parameters, i.e., the grid strength, reference value of the control system, and grid voltage, on the dynamic behavior of the GVSC in the electromechanical bandwidth, are investigated using frequency domain sensitivity. Analysis results show that the GVSC generates responses with respect to the electromechanical mode. These responses have different sensitivities to the operation parameters. The IEEE 10-machine power system simulation is performed, and the power hardware-in-the-loop platform with the GVSC was applied to validate the analysis.

scholarly journals Seven Level Voltage Source Converter Based Static Synchronous Compensator with a Constant DC-Link Voltage

2021 ◽  
Vol 11 (16) ◽  
pp. 7330
Author(s):  
L. Narayana Gadupudi ◽  
Gudapati Sambasiva Rao ◽  
Ramesh Devarapalli ◽  
Fausto Pedro García Márquez
Keyword(s):  
Power Systems ◽  
Energy Demand ◽  
Reactive Power ◽  
Transmission System ◽  
Functional Improvement ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Static Synchronous Compensator ◽  
Functional Efficiency ◽  
Binary Weighted

Flexible alternating current transmission system (FACTS) controllers are important to enhance the quality of power in power systems. The stability of a system is achieved via a FACTS device (a Static Synchronous Compensator (STATCOM)). This paper aims to control the losses in the transmission system during peak energy demand circumstances with minimal losses in the economical and functional efficiency of the system. The STATCOM operation of a seven level voltage source converter (VSC) with binary-weighted transformers is proposed for controlling the reactive power variations and terminal voltage changes at dynamic circumstances in the transmission system. The STATCOM is operated at 132 kV and is a 50 Hz AC system with a single DC-Link capacitance and two VSC power circuits. Each VSC circuit consists of three H-bridges with specific switching angle control in order to achieve low total harmonic distortion at the fundamental frequency. The coupled control circuit phenomenon is imperative for computing the switching angle for a stable performance. The dynamic functional improvement efficiency is harvested with a minimum number of switches and transformers used in high voltage and high-power applications. The number of switches, transformers, and capacitors for 132 kV are optimized with a proposed STATCOM operation in seven level VSC with binary-weighted transformers. The simulated results prove that the proposed model significantly improved system performance and stability.

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