Impedance-based Analysis of Constant Reactive Power Control for Voltage Source Converter in Weak AC Grids

2019 ◽  
Author(s):  
Luyao Xu ◽  
Hui Yuan ◽  
Zhou Lan ◽  
Huanhai Xin ◽  
Di Wu ◽  
...  
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Reactive Power Control

scholarly journals The Influence of VSC–HVDC Reactive Power Control Mode on AC Power System Stability

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1677 ◽  
Author(s):  
Ying Wang ◽  
Youbin Zhou ◽  
Dahu Li ◽  
Dejun Shao ◽  
Kan Cao ◽  
...  
Keyword(s):  
Power System ◽  
Power Control ◽  
Reactive Power ◽  
Dynamic Responses ◽  
System Stability ◽  
Control Mode ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Reactive Power Control ◽  
Margin Control

Voltage source converter-based high-voltage direct current (VSC-HVDC) has the advantage of fast and independent controllability on active and reactive power. This paper focuses on effects of commonly proposed reactive power control modes, constant reactive power control and AC voltage margin control. Based on the mathematical model of single machine infinity equivalent system with embedded VSC-HVDC, the influence of VSC-HVDC with different reactive power control strategies on transient stability and dynamic stability of the AC system is studied. Then case studies were conducted with a realistic model of grid. The dynamic responses of AC/DC systems for different VSC-HVDC reactive power control modes were compared in detail. It is shown that compared to constant reactive power control, AC voltage margin control can provide voltage support to enhance the transient angle stability of an AC system. However, the fluctuant reactive power injected into a weak AC system may adversely affect power system oscillation damping for VSC-HVDC with AC voltage margin control, if the parameters of the controller have not been optimized to suppress the low-frequency oscillation. The results of this paper can provide certain reference for the decision of an appropriate VSC-HVDC reactive power control mode in practice.

Design, Control, and Modeling of a New Voltage Source Converter for HVDC System

2013 ◽  
Vol 14 (2) ◽  
pp. 123-138
Author(s):  
Madhan Mohan ◽  
Bhim Singh ◽  
Bijaya Ketan Panigrahi
Keyword(s):  
Power Control ◽  
Fundamental Frequency ◽  
Reactive Power ◽  
Control Method ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Reactive Power Control ◽  
Hvdc System ◽  
Active And Reactive Power ◽  
The Dead

Abstract: A New Voltage Source Converter (VSC) based on neutral clamped three-level circuit is proposed for High Voltage DC (HVDC) system. The proposed VSC is designed in a multipulse configuration. The converter is operated by Fundamental Frequency Switching (FFS). A new control method is developed for achieving all the necessary control aspects of HVDC system such as independent real and reactive power control, bidirectional real and reactive power control. The basic of the control method is varying the pulse width and by keeping the dc link voltage constant. The steady state and dynamic performances of HVDC system interconnecting two different frequencies network are demonstrated for active and reactive power control. Total number of transformers used in this system are reduced to half in comparison with the two-level VSCs for both active and reactive power control. The performance of the HVDC system is improved in terms of reduced harmonics level even at fundamental frequency switching. The harmonic performance of the designed converter is also studied for different value of the dead angle (β), and the optimized range of the dead angle is achieved for varying reactive power requirement. Simulation results are presented for the designed three level multipulse voltage source converters with the proposed control algorithm.

scholarly journals Design of Robust Current Controller for Two-Level 12-Pulse VSC-based STATCOM

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
M. Janaki ◽  
R. Thirumalaivasan ◽  
Nagesh Prabhu
Keyword(s):  
Power Control ◽  
Transient Response ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Transient Simulation ◽  
Voltage Source ◽  
Reactive Power Control ◽  
Typical Application ◽  
Current Controller ◽  
Reactive Current

The static synchronous compensator (STATCOM) is a shunt connected voltage source converter (VSC) based FACTS controller using GTOs employed for reactive power control. A typical application of a STATCOM is for voltage regulation at the midpoint of a long transmission line for the enhancement of power transfer capability and/or reactive power control at the load centre. The PI controller-based reactive current controller can cause oscillatory instability in inductive mode of operation of STATCOM and can be overcome by the nonlinear feedback controller. The transient response of the STATCOM depends on the controller parameters selected. This paper presents a systematic method for controller parameter optimization based on genetic algorithm (GA). The performance of the designed controller is evaluated by transient simulation. It is observed that the STATCOM with optimized controller parameters shows excellent transient response for the step change in the reactive current reference. While the eigenvalue analysis and controller design are based on D-Q model, the transient simulation is based on both D-Q and 3-phase models of STATCOM (which considers switching action of VSC).

scholarly journals Virtual Flux Predictive Direct Power Control of Five-level T-type Multi-terminal VSC-HVDC System

2020 ◽  
Vol 64 (2) ◽  
pp. 133-143
Author(s):  
Ahmed Reguig Berra ◽  
Said Barkat ◽  
Mansour Bouzidi
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Operating Conditions ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Switching Frequency ◽  
Direct Power ◽  
Direct Power Control ◽  
Active And Reactive Power ◽  
Virtual Flux

This paper proposes a Virtual Flux Predictive Direct Power Control (PDPC) for a five-level T-type multi-terminal Voltage Source Converter High Voltage Direct Current (VSC-HVDC) transmission system. The proposed PDPC scheme is based on the computation of the average voltage vector using a virtual flux predictive control algorithm, which allows the cancellation of active and reactive power tracking errors at each sampling period. The active and reactive power can be estimated based on the virtual flux vector that makes AC line voltage sensors not necessary. A constant converter switching frequency is achieved by employing a multilevel space vector modulation, which ensures the balance of the DC capacitor voltages of the five-level t-type converters as well. Simulation results validate the efficiency of the proposed control law, and they are compared with those given by a traditional direct power control. These results exhibit excellent transient responses during range of operating conditions.

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