System-level Control Strategy of UPFC in Regional Power Grids

2019 ◽  
Author(s):  
Jian Yang ◽  
Zheyang Yu ◽  
Chaonan Ying ◽  
Zheng Xu ◽  
Guangzeng You
Keyword(s):  
Control Strategy ◽  
Power Grids ◽  
System Level ◽  
Regional Power ◽  
Level Control

scholarly journals Hierarchical and Droop Method for DC Micro-grid Bus Voltage under Isolated operation

2020 ◽  
Vol 185 ◽  
pp. 01062
Author(s):  
Xiangyang Yan ◽  
Ningkang Zheng ◽  
Yilong Kang ◽  
Huanruo Qi ◽  
Kai Li ◽  
...  
Keyword(s):  
Control Strategy ◽  
Power Supply ◽  
System Level ◽  
Level Control ◽  
New Energy ◽  
Operation Control ◽  
Micro Grid ◽  
Dc Bus ◽  
Bus Voltage ◽  
The Stability

Nowadays, distributed generation technology is of great help to the efficient utilization of new energy. If the distributed power supply is connected to the DC micro-grid, it will be more secure and reliable. Therefore, it is necessary to control the voltage stability of the DC bus and ensure the balance of the source charge power of system to ensure the power supply quality and safety of the DC micro-grid. There are two operation modes of DC micro-grid: connected operation and isolated operation, and isolated operation control is the foundation and key of system-level control of DC micro-grid. To solve the problem of bus voltage fluctuation in isolated dc micro-grid, this study proposes a voltage hierarchical-droop control strategy for DC micro-grid, which can effectively improve the stability of the DC bus voltage. Last, this study builds the simulation model of DC micro-grid in the MATLAB/Simulink platform to verify the validity and feasibility of the proposed control strategy.

Integrated Dynamic Simulation Model With Supervisory Control Strategy for a PEM Fuel Cell Hybrid Vehicle

2004 ◽  
Author(s):  
Chan-Chiao Lin ◽  
Huei Peng ◽  
Min Joong Kim ◽  
Jessy W. Grizzle
Keyword(s):  
Fuel Cell ◽  
Control Strategy ◽  
Cell Model ◽  
Cell System ◽  
System Level ◽  
Fuel Cell Vehicle ◽  
Strategy Development ◽  
Stochastic Dynamic ◽  
Fuel Cell System ◽  
Level Control

System-level modeling and control strategy development for a hybrid fuel cell vehicle (HFCV) are presented in this paper. A reduced-order fuel cell model is created to accurately predict the fuel cell system efficiency while retaining dynamic effects of important reactant variables. The fuel cell system model is then integrated with a DC/DC converter, a Li-Ion battery, an electric drive and tire/vehicle dynamics to form a HFCV. The supervisory-level control problem of the HFCV is subsequently investigated. A stochastic dynamic programming (SDP) based approach is applied to obtain an optimal power management strategy. Simulations over different driving cycles showed that the SDP control strategy not only saved a significant amount of hydrogen but also produced smoother load for the fuel cell stack—both of which help the long term viability of the fuel cell technology for automotive applications.

DC-Bus Dual-Level Control Strategy for PV Power System With Dual-Mode Operation

2019 ◽  
Vol 34 (1) ◽  
pp. 267-276 ◽  
Author(s):  
Terng-Wei Tsai ◽  
Cheng-Jhen Yang ◽  
Yi-Chan Li ◽  
Yaow-Ming Chen ◽  
Yung-Ruei Chang
Keyword(s):  
Power System ◽  
Control Strategy ◽  
Level Control ◽  
Dual Mode ◽  
Mode Operation ◽  
Dc Bus

scholarly journals A Stabilization Method Based on an Adaptive Feedforward Controller for the Underactuated Bipedal Walking with Variable Step-Length on Compliant Discontinuous Ground

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Yang Wang ◽  
Daojin Yao ◽  
Jie He ◽  
Xiaohui Xiao
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Ground Surface ◽  
Step Length ◽  
Bipedal Walking ◽  
Level Control ◽  
Stabilization Method ◽  
Feedforward Controller ◽  
High Level ◽  
Adaptive Feedforward

Both compliance and discontinuity are the common characteristics of the real ground surface. This paper proposes a stabilization method for the underactuated bipedal locomotion on the discontinuous compliant ground. Unlike a totally new control method, the method is actually a high-level control strategy developed based on an existing low-level controller meant for the continuous compliant ground. As a result, although the ground environment is more complex, the calculation cost for the robot walking control system is not increased. With the high-level control strategy, the robot is able to adjust its step-length and velocity simultaneously to stride over the discontinuous areas on the compliant ground surface. The effectiveness of the developed method is validated with a numerical simulation and a physical experiment.

scholarly journals A Control Scheme with the Variable-Speed Pitch System for Wind Turbines during a Zero-Voltage Ride Through

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3344
Author(s):  
Enyu Cai ◽  
Yunqiang Yan ◽  
Lei Dong ◽  
Xiaozhong Liao
Keyword(s):  
Wind Turbines ◽  
Low Voltage ◽  
System Modeling ◽  
Fault Analysis ◽  
System Level ◽  
Level Control ◽  
Control Logic ◽  
Control Scheme ◽  
Pitch System ◽  
Zero Voltage

Zero-voltage ride through (ZVRT) is the extreme case of low-voltage ride through (LVRT), which represents the optimal grid-connection capability of wind turbines (WTs). Enforcing ZVRT will improve the dynamic performance of WTs and therefore significantly enhance the resiliency of renewable-rich grids. A control scheme that includes a pitch system is an essential control aspect of WTs riding through voltage dips; however, the existing control scheme with a pitch system for LVRT cannot distinguish between a ZVRT status and a power-loss condition, and, consequently, does not meet the ZVRT requirements. A system-level control scheme with a pitch system for ZVRT that includes pitch system modeling, control logic, control circuits, and overspeed protection control (OPC) is proposed in this paper for the first time in ZVRT research. Additionally, the field data are shared, a fault analysis of an overspeed accident caused by a voltage dip that describes the operating status at the WT-collapse moment is presented, and some existing WT design flaws are revealed and corrected by the fault analysis. Finally, the pitching performance during a ZVRT, which significantly affects the ZVRT performance of the WT, is obtained from laboratory and field tests. The results validate the effectiveness of the proposed holistic control scheme.

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