A novel parameter design method of dual-loop control strategy for grid-connected inverters with LCL filter

2009 ◽  
Author(s):  
Jinjun Yin ◽  
Shanxu Duan ◽  
Yan Zhou ◽  
Fei Liu ◽  
Changsong Chen
Keyword(s):  
Control Strategy ◽  
Design Method ◽  
Parameter Design ◽  
Lcl Filter ◽  
Loop Control

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.

scholarly journals A Control Strategy of a Single-phase H6-type Grid-connected Inverter with Low Harmonic Current

2018 ◽  
Vol 173 ◽  
pp. 02041
Author(s):  
Lin Chunxu ◽  
Zhou Chunhua ◽  
Li Wei ◽  
Chen Rui
Keyword(s):  
Control Strategy ◽  
Single Phase ◽  
Closed Loop ◽  
High Efficiency ◽  
Control Method ◽  
Harmonic Distortion ◽  
Outer Loop ◽  
Lcl Filter ◽  
Loop Control ◽  
Grid Connected Inverter

In order to reduce the total harmonic distortion (THD) of the grid-connected current caused by the high-frequency switching of the inverter, this paper combines the high efficiency single-phase H6-type inverter with LCL filter. The double closed-loop control method that consists of grid-connected current outer loop and capacitor current inner loop is put forward, by which a resonance peak of a low damping LCL filter is eliminated. In the grid-connected current outer loop, quasi proportion resonant (QPR) controller is adopted to overcome the steady-state error and weak anti-jamming capability in traditional PI controller. Finally, a simulation model is built in SIMULINK to verify the research. The simulation results show that, based on the single-phase H6-type inverter and LCL filter, the double closed-loop QPR control strategy can achieve the static error free tracking control of grid-connected current, which makes the system more stable and reduces the THD of grid-connected current effectively.

scholarly journals Dual-loop Control Strategy for Grid-connected Inverter with LCL Filter

2013 ◽  
Vol 05 (04) ◽  
pp. 97-101 ◽  
Author(s):  
Qiubo Peng ◽  
Hongbin Pan ◽  
Yong Liu ◽  
Lidan Xiang
Keyword(s):  
Control Strategy ◽  
Lcl Filter ◽  
Loop Control ◽  
Grid Connected Inverter

scholarly journals A NOVEL METHOD FOR DESIGNING THE CONTROLLER OF A LCL-FILTER-BASED GRID-CONNECTED INVERTER WITH CONSIDERING VARYING SYSTEM PARAMETERS

2018 ◽  
Vol 54 (3A) ◽  
pp. 39
Author(s):  
Nguyen Trung Nhan
Keyword(s):  
Controller Design ◽  
Design Method ◽  
Lcl Filter ◽  
Loop Control ◽  
System Parameters ◽  
Three Phase ◽  
Loop Control System ◽  
Novel Method ◽  
Grid Connected Inverter ◽  
The Stability

Exactly determining the control coefficients for the controller of a three-phase LCL-filter-based inverter is an important and challenging issue in microgrid systems. However, existing LCL-filter-based inverter systems usually assume that all system parameters are determined accurately and remain constant over time, which is not true in real situations. Variations in the system parameters are known to possibly seriously degrade the performance of LCL-filter-based inverter systems. For efficiency and robustness, this paper proposes a novel method for the generalized controller design of a three-phase LCL-filter-based grid-connected inverter system that can address deviations in system parameters. An optimum way to determine the stability bounds under various system parameters cases is introduced. The assessment of the stability bounds is based on the Routh criterion by solving the characteristic equation of the closed-loop control system. Simulations results are presented to validate the correctness and effectiveness of the proposed design method.

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