The Research on the Design Method of Micro Grid Operation Control Strategy Based on the Analysis of the Typical Example

2014 ◽  
Vol 548-549 ◽  
pp. 868-872
Author(s):  
Nan Wang ◽  
Hong Tan ◽  
Shan Shan Shi ◽  
Zhi Qiang Yuan
Keyword(s):  
Control Strategy ◽  
Design Principle ◽  
Design Method ◽  
Integrated Control ◽  
Control Mode ◽  
Maximum Efficiency ◽  
Operation Control ◽  
Fault State ◽  
Latch State ◽  
Grid Operation

Abstract: Analyzing the rules of microgrid operation based on the design principle and engineering philosophy, and then defining seven microgrid operation states included: grid-tied state, and/off state, off-grid state, off/and state, fault state, power-latch state and shutdown state. Based on these seven modes, the different control strategy will be set out. These seven strategies can be integrated and be used to control the microgrid together. So we can gain the maximum efficiency of the microgrid through that above. At the same time, the appropriate control mode will be selected to guarantee the microgrid can be switched from one mode to another smoothly.. Above all, the microgrid can operate reliably through the integrated control strategy.

scholarly journals Integrated Control Strategy for Inductive Power Transfer Systems with Primary-Side LCC Network for Load-Average Efficiency Improvement

Energies ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 312 ◽  
Author(s):  
Sangjoon Ann ◽  
Woo-Young Lee ◽  
Gyu-Yeong Choe ◽  
Byoung Kuk Lee
Keyword(s):  
Output Power ◽  
Control Strategy ◽  
Integrated Control ◽  
Control Mode ◽  
Power Transfer ◽  
Additional Advantage ◽  
Inductive Power Transfer ◽  
Average Efficiency ◽  
Load Average ◽  
Inductive Power

An inductive power transfer (IPT) system has lower peak efficiency and significantly lower load-average efficiency over the entire range of output power than typical power conversion systems because it transmits power wirelessly through magnetically coupled coils. In order to improve the load-average efficiency of the IPT system, this paper proposes an integrated control strategy consisting of full-bridge, phase-shift, and half-bridge control modes. The coupling coefficient and output power conditions for each control mode are theoretically analyzed, and the proposed control algorithm is established. In order to verify the analysis results, a 3.3 kW IPT system prototype is constructed, and it is experimentally verified that the load-average efficiency is improved by up to 3.75% with respect to the output power when using the proposed control scheme. In addition, the proposed control has the additional advantage that it can be directly applied to the existing IPT system without changing or adding hardware.

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.

Research on Control Strategy of Integrated Gasification Humid Air Turbine Cycle

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Tingting Wei ◽  
Dengji Zhou ◽  
Di Huang ◽  
Shixi Ma ◽  
Wang Xiao ◽  
...  
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Design Method ◽  
Control Mode ◽  
Humid Air ◽  
Loop Control ◽  
System A ◽  
Air Turbine ◽  
Integrated Gasification ◽  
Strategy Design

Integrated gasification humid air turbine (IGHAT) cycle is an advanced power generation system, combining gasification technology and humid air turbine (HAT) cycle. It draws great attention in the energy field considering its high specific power, high efficiency, and low emission. There are only a few HAT cycle plants and IGHAT cycle is still on the theory research stage. Therefore, the study on control strategies of IGHAT cycle has great significance in the future development of this system. A design method of control strategy is proposed for the unknown gas turbine systems. The control strategy design is summarized after IGHAT control strategy and logic is designed based on the dynamic simulation results and the operation experience of gas turbine power station preliminarily. Then, control logic is configured and a virtual control system of IGHAT cycle is established on the Ovation distribution control platform. The model-in-loop control platform is eventually set up based on the interaction between the simulation model and the control system. A case study is implemented on this model-in-loop control platform to demonstrate its feasibility in the practical industry control system. The simulation of the fuel switching control mode and the power control mode is analyzed. The power in IGHAT cycle is increased by 24.12% and 32.47%, respectively, compared to the ones in the simple cycle and the regenerative cycle. And the efficiency of IGHAT cycle is 1.699% higher than that of the regenerative cycle. Low component efficiency caused by off-design performance and low humidity caused by high pressure are the main limits for system performance. The results of case study show the feasibility of the control strategy design method proposed in this paper.

Research on Control Strategy of Integrated Gasification Humid Air Turbine Cycle

2017 ◽  
Author(s):  
Tingting Wei ◽  
Dengji Zhou ◽  
Di Huang ◽  
Shixi Ma ◽  
Huisheng Zhang ◽  
...  
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Design Method ◽  
Control Mode ◽  
Humid Air ◽  
Loop Control ◽  
System A ◽  
Air Turbine ◽  
Integrated Gasification ◽  
Strategy Design

Integrated Gasification Humid Air Turbine (IGHAT) cycle is an advanced power generation system, combining gasification technology and Humid Air Turbine (HAT) cycle. It draws great attention in the energy field considering its high specific power, high efficiency and low emission. There are only a few H AT cycle plants and IGHAT cycle is still on the theory research stage. Therefore, the study on control strategies of IGHAT cycle has great significance in the future development of this system. A design method of control strategy is proposed for the unknown gas turbine systems. The control strategy design is summarized after IGHAT control strategy and logic is designed based on the dynamic simulation results and the operation experience of gas turbine power station preliminarily. Then, control logic is configured and a virtual control system of IGHAT cycle is established on the Ovation distribution control platform. The model-in-loop control platform is eventually set up based on the interaction between the simulation model and the control system. A case study is implemented on this model-in-loop control platform to demonstrate its feasibility in the practical industry control system. The simulation of the fuel switching control mode and the power control mode is analyzed. The power in IGHAT cycle is increased by 24.12% and 32.47% respectively, compared to the ones in the simple cycle and the regenerative cycle. And the efficiency of IGHAT cycle is 1.699% higher than that of the regenerative cycle. Low component efficiency caused by off-design performance and low humidity caused by high pressure are the main limits for system performance. The results of case study show the feasibility of the control strategy design method proposed in this paper.

Real power regulation design for multi-terminal VSC-HVDC systems

2013 ◽  
Vol 3 (2) ◽  
Author(s):  
Guo-Jie Li ◽  
Si-Ye Ruan ◽  
Tek Lie
Keyword(s):  
Control Strategy ◽  
Control Mode ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Real Power ◽  
The Real ◽  
Hvdc System ◽  
High Voltage Direct Current ◽  
Power Regulation ◽  
Regulation Functions

AbstractA multi-terminal voltage-source-converter (VSC) based high voltage direct current (HVDC) system is concerned for its flexibility and reliability. In this study, a control strategy for multiple VSCs is proposed to auto-share the real power variation without changing control mode, which is based on “dc voltage droop” power regulation functions. With the proposed power regulation design, the multiple VSCs automatically share the real power change and the VSC-HVDC system is stable even under loss of any one converter while there is no overloading for any individual converter. Simulation results show that it is effective to balance real power for power disturbance and thus improves operation reliability for the multi-terminal VSC-HVDC system by the proposed control strategy.

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

Operation Control Strategy of DC Microgrid Based on E-router

2021 ◽  
Author(s):  
Xiaoying Yu ◽  
Tong Zhou ◽  
Shubo Hu ◽  
Hui Sun ◽  
Fuhong Zhang ◽  
...  
Keyword(s):  
Control Strategy ◽  
Dc Microgrid ◽  
Operation Control
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