Control Strategy of Smooth Switching Between Grid-connected and Off-grid Operation for Multi-port Home Energy Router

2021 ◽  
Author(s):  
Pingkang Zheng ◽  
Caihong Zhao ◽  
Bangda Wei ◽  
Tao Cai ◽  
Qing Duan
Keyword(s):  
Control Strategy ◽  
Smooth Switching ◽  
Grid Operation

Control Strategy and Stability Analysis of Impedance Isolated Medium Voltage UPS in Off-grid Operation

2021 ◽  
Author(s):  
Ganghua Zhang ◽  
Yaoyao Xiao ◽  
Mingyu Han ◽  
Wenping Zuo ◽  
Meng Zhou ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Control Strategy ◽  
Medium Voltage ◽  
Grid Operation

Research on Jing-Jin-Tang Power Grid Coordinated Control Strategy

2015 ◽  
Vol 799-800 ◽  
pp. 1306-1310
Author(s):  
Fang Ming Niu ◽  
Peng Wang ◽  
Yu Cheng ◽  
Xue Dong Ren
Keyword(s):  
Control Strategy ◽  
Power Grid ◽  
Coordinated Control ◽  
Automatic Generation ◽  
Control Mode ◽  
Practical Significance ◽  
Control Effect ◽  
Spare Capacity ◽  
New Strategy ◽  
Grid Operation

The disadvantage of Beijing-Tianjin-Tangshan power grid operation control mode is that the control effect is poorer and the spare capacity demand is big, this paper puts forward a new coordinated control strategy. First of all, this paper describes the relationship between the load, frequency, the output of generating unit, the tie line power and the area control error relationship of the whole power grid, according to the regional automatic generation control performance assessment criteria, concludes the characteristics of regional unit adjustment. This paper analyzes the contradiction between them, and then proposes a coordinated control strategy between the Beijing-Tangshan power grid and Tianjin power grid. The case simulation results prove the superiority and feasibility of the new coordinated control strategy. Compared with the original, the new strategy reduces the volatility of the unit, shortens the recovery time of frequency, and has a certain practical significance.

scholarly journals Integrated control strategy for smooth switching of the PV and battery-storage micro-grid based on operation state tracking

2019 ◽  
Vol 2019 (16) ◽  
pp. 1062-1067
Author(s):  
Li Yang ◽  
Gao Song ◽  
Shi Wenhui ◽  
He Guoqing ◽  
Wang ZhengPing
Keyword(s):  
Control Strategy ◽  
Integrated Control ◽  
Battery Storage ◽  
State Tracking ◽  
Micro Grid ◽  
Smooth Switching ◽  
Grid Based

scholarly journals A three-level support method for smooth switching of the micro-grid operation model

2018 ◽  
Vol 108 ◽  
pp. 052069
Author(s):  
Yuanyang Zong ◽  
Dongliang Gong ◽  
Jianzhou Zhang ◽  
Bin Liu ◽  
Yun Wang
Keyword(s):  
Operation Model ◽  
Micro Grid ◽  
Smooth Switching ◽  
Grid Operation

A Control Strategy with Series-Parallel Inverter for Micro-Grid Operation

2014 ◽  
Vol 1044-1045 ◽  
pp. 677-680
Author(s):  
Gui Ying Liu ◽  
Yong Guang Gui ◽  
Shi Ping Su ◽  
Qian Luo ◽  
Jiang Wu ◽  
...  
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Operation Mode ◽  
Droop Control ◽  
Three Phase ◽  
Islanding Operation ◽  
Integral Controller ◽  
Micro Grid ◽  
Grid Operation ◽  
Parallel Inverter

For the different operation mode of micro-grid, an improved droop control method and a parallel inverter was proposed depending on the study of micro-grid inverter. Grid-connected interface contains a series inverter and a parallel inverter, and can be switched to select different work mode. The parallel inverter can eliminate harmonic, compensate three-phase imbalanced current to improve the quality of the power delivered to the utility grid. In islanding operation mode, the improved droop control strategy was applied, where an integral controller was introduced. So it can reduce the inverter output voltage amplitude. Thereby it can restrain circulation and realize the power of self-distribution. The effectiveness and feasibility are verified by the simulation result.

scholarly journals Smooth-Switching Control of Robot-Based Permanent-Magnet Synchronous Motors via Port-Controlled Hamiltonian and Feedback Linearization

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5731
Author(s):  
Anxing Liu ◽  
Haisheng Yu
Keyword(s):  
Control Strategy ◽  
Feedback Linearization ◽  
Dynamic Performance ◽  
Switching Control ◽  
Switching Function ◽  
Complete Model ◽  
Robot System ◽  
Permanent Magnet Synchronous Motors ◽  
Loop Feedback ◽  
Smooth Switching

To solve the contradiction between dynamic performance and steady-state performance of the robot system, a smooth-switching control strategy is proposed. By combining robot and motor model, the complete model of the robot driving system is established. The single-loop Feedback Linearization (FL) controller and Port-Controlled Hamiltonian (PCH) controller based on the complete model are derived to ensure the rapidity and stability of the system respectively. A smooth-switching function based on position error is designed. It can ensure the smooth-switching between two controllers and avoid the instability caused by switch-switching. The proposed algorithm can make the robot system have good dynamic and steady performance. Simulation and experiment results demonstrate the effectiveness of the smooth-switch control strategy.

Comprehensive Control Strategy and Simulation Research on Micro Grid

2014 ◽  
Vol 602-605 ◽  
pp. 2609-2614
Author(s):  
Yu Long Wang
Keyword(s):  
Control Strategy ◽  
Power Distribution ◽  
Hot Spot ◽  
Green Energy ◽  
Simulation Software ◽  
Regulation Mechanism ◽  
Droop Control ◽  
Simulation Research ◽  
Micro Grid ◽  
Grid Operation

Micro grid can integrate various distributed generators and provide local load with green energy. Therefore, it becomes a hot spot of research in every country all over the world. Due to small inertia, large number of models, big difference among internal electric sources of Micro grid operation, it is more difficult to keep stabilization of voltage frequency of common points in the network, and more complicated to control the problems. The article puts forward the improved droop control strategy based on distributed power supply layer, on the basis of traditional droop control, it increases the feed forward regulation mechanism so as to change the droop coefficient, increase the power regulation scope, speed up the common point frequency voltage stability and improve the control precision, which has realized the specific control of power output when the Micro grid synchronizes and closes, as well as the purpose of power distribution according to load demand for islanding. Finally, we use power system simulation software PSCAD/EMTDC V4.4 to verify the practicability of the proposed scheme.

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