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 Two Legs Voltage Source Converter with DSTATCOM, T-Connected Transformer for Power Quality Improvement

2020 ◽  
Vol 07 (03) ◽  
pp. 22-26
Author(s):  
Bibhuti Bhusan Kumar ◽  
Keyword(s):  
Neutral Current ◽  
Unit Vector ◽  
Working Environment ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Linear Load ◽  
Proposed Model ◽  
Power Quality Improvement ◽  
And Performance ◽  
Static Compensator

The numerous loads can impact the working environment and performance of the source apparatus. Hence, the reimbursement of this current will help in enhancing the presentation of the power system apparatus. This paper presents the strategy and employment of a Distribution Static Compensator (DSTATCOM) with the T-Connected transformer for compensation of load neutral current in the presence of three-phase unbalanced linear load. There are different types of control strategy in that one of the best methods is the unit vector template method-based control algorithm has been implemented for the control of the proposed DSTATCOM. The proposed model has been simulated in a SIMULINK/ MATLAB environment. The simulation results show the effectiveness of the proposed algorithm.

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 Dynamic analysis of voltage angle droop controlled HVDC systems in curative congestion management scenarios

2019 ◽  
Vol 217 ◽  
pp. 01004
Author(s):  
Yang Zhou ◽  
Stefan Dalhues ◽  
Ulf Häger
Keyword(s):  
Power System ◽  
Dynamic Behavior ◽  
Transmission Lines ◽  
Power Flow ◽  
Congestion Management ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Management Scenarios ◽  
Hvdc System ◽  
Good Ability

The integration of the voltage-source converter based high voltage direct current (VSC-HVDC) system makes the set-point of its active power adaptive to the changes in the power flow, and contributes to the curative congestion management. To further exploit the dynamic behavior of a hybrid AC/DC power system in curative congestion management scenarios, this paper investigates a novel control scheme for voltage angle droop controlled HVDC (VAD-HVDC) systems. The proposed scheme to alleviate the circuit overload is estimated firstly by calculating the severity index when the power flow changes under N-1 situations. Then the voltage angle controlled HVDC system is applied on the modified IEEE 39-bus 10-machine test power system for the time-domain simulation. The dynamic behavior in the HVDC station validates that the VAD control can stabilize the DC voltage and possess a good ability against interference. In addition, the dynamic characteristics analysis on the AC transmission lines proves that the hybrid AC/DC system integrated with the VAD controlled HVDC system are in possession of good stability after the N-1 contingency event. The VAD controller employed in the HVDC system is capable of effective congestion management to mitigate the critical loadings on the transmission lines.

Voltage Stability Analysis of Wind Power Integrated System Based on Flexible HVDC

2013 ◽  
Vol 336-338 ◽  
pp. 1165-1169
Author(s):  
Ling Long Meng ◽  
Zhen Ning Tang ◽  
Dao Nong Zhang ◽  
Jie Ji ◽  
Jian Hua Zhang
Keyword(s):  
Wind Power ◽  
Voltage Stability ◽  
Transient Stability ◽  
Power Transmission ◽  
Reference Value ◽  
Integrated System ◽  
Voltage Source ◽  
Dc Power ◽  
Ac Power ◽  
Dc Power Transmission

With the scale of integration of wind power increases gradually, the voltage stability and the fluctuation problem of the system caused by integration have become more and more prominent. Traditional AC power transmission mode cannot alleviate the adverse effects of integration of wind power, Flexible DC power transmission has many advantages due to the use of voltage source converters self-commutated characteristics, Flexible DC power provides a new technical method and also provides a solution for the integration. This paper introduces the basic structure and the basic control principle of Flexible DC power transmission technology. Then, through comparing the transient stability level and voltage supporting ability of AC power transmission with that of Flexible DC power transmission, an isolated system is used as an example to elaborate the beneficial contribution that the new integration of wind power make to the voltage stability, which indicates that Flexible DC power transmission technology has broad application prospect in the transmission area of wind power, and gives very good reference value for the Flexible DC power used in integration in the future.

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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