scholarly journals Coordination of synchronous compensators and converters to improve the commutation failure recovery performance in HVDC systems

2021 ◽  
Vol 2093 (1) ◽  
pp. 012018
Author(s):  
Kuayu Wu ◽  
Jiancheng Zhang ◽  
Yongzhi Zhou ◽  
Yuhong Zhu
Keyword(s):  
Case Studies ◽  
Control Strategy ◽  
Voltage Control ◽  
The State ◽  
Failure Recovery ◽  
Voltage Regulator ◽  
Fault Recovery ◽  
Commutation Failure ◽  
Recovery Performance ◽  
Voltage Support

Abstract A novel control strategy of synchronous compensators and converters is proposed to increase the ability of line commutated converter (LCC) based HVDC systems to successfully recover from commutation failures (CFs). The dynamic var support is one of the most important factors, which impact the commutation process. Many synchronous compensators have been implemented to enhance the transient voltage stability for improving the CF recovery performance. However, the traditional automatic voltage regulator (AVR) of synchronous compensator may not be suitable for the commutation voltage support, because the transient var demand of converters during the CF recovery is neglected. In our work, the voltage control will be adaptively adjusted, depending on the state of converters. Case studies based on simulations in PSCAD/EMTDC show that the proposed strategy can improve the performance of fault recovery from CF.

scholarly journals Control Strategy of Mode Transition with Engine Start in a Plug-in Hybrid Electric Bus

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2989 ◽  
Author(s):  
Yang ◽  
Zhang ◽  
Zhang ◽  
Tian ◽  
Hu
Keyword(s):  
Control Strategy ◽  
Transition Process ◽  
Structural Features ◽  
Driving Performance ◽  
The State ◽  
Switching Process ◽  
Mode Switching ◽  
Mode Transition ◽  
Power Sources ◽  
Hybrid Electric

Torque coordinated control of the relevant power sources has an important impact on the vehicle dynamics and driving performance during the mode transition of the hybrid electric vehicles(HEVs). Considering the dynamic impact problem caused by mode transition, this paper, based upon the structural features of axially paralleled hybrid power system, introduces the bumpless mode switching control theory to analyze multi-mode transition. Firstly, the state transition process is abstracted as the state space transition problem of hybrid system. Secondly the mode transition is divided into four sub-states, and the state model of each sub-state is established. Thirdly, taking the cost functions as the optimization objective, the state switching process is solved, and the control vectors of each switching process are obtained. Simulation and experimental results show that the proposed control strategy can effectively suppress torque fluctuation, avoid longitudinal acceleration impact, and improve driving performance.

The reactive power voltage control strategy of PV systems in low-voltage string lines

2017 ◽  
Author(s):  
Feng Zhang ◽  
Xiaolong Guo ◽  
Xiqiang Chang ◽  
Guowei Fan ◽  
Lianger Chen ◽  
...  
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Low Voltage ◽  
Voltage Control ◽  
Voltage Control Strategy ◽  
Pv Systems

A Study of Sustainable Design Based on Unconscious Behavior

2012 ◽  
Vol 490-495 ◽  
pp. 1920-1924 ◽  
Author(s):  
Xiao Tao Hu
Keyword(s):  
Case Studies ◽  
Natural Environment ◽  
Sustainable Design ◽  
The State ◽  
Daily Behavior ◽  
Saving Behavior

Nowadays, a lot of people engage in unsustainable daily behavior unconsciously, although most of them worry about the state of our natural environment. Designers can find ideas in people’s unconscious saving behavior and wasting behavior, and then realize these ideas into design. Based upon the case studies, the paper gives hints how to realize ideas derived from unconscious behavior into sustainable design.

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