Effective Control Method of Power Storage System for the Operating Stability Improvement of Lean-Burn Gas Engine

2012 ◽  
Author(s):  
Toshiyuki Ito ◽  
Susumu Sato ◽  
Junichi Arai ◽  
Ryuichi Yokoyama ◽  
Tatsuya Tsukada ◽  
...  
Keyword(s):  
Control Method ◽  
Storage System ◽  
Effective Control ◽  
Lean Burn ◽  
Gas Engine ◽  
Operating Stability ◽  
Power Storage

Investigation on Control Strategies to Smooth out Wind Farm Output Fluctuations Using Energy Storage System

2014 ◽  
Vol 521 ◽  
pp. 117-123
Author(s):  
Yuan Liu ◽  
Shi Lin Liu ◽  
Jin Yu Wen
Keyword(s):  
Energy Storage ◽  
Wind Power ◽  
Power Quality ◽  
Wind Farm ◽  
Control Method ◽  
Energy State ◽  
Storage System ◽  
Energy Storage System ◽  
Effective Control ◽  
Maximum Utility

Due to characteristics of random fluctuations and intermittence, large-scale wind power integration will worsen grid stability and power quality. According to grid code, a limit of ramp rate for both 1 minute and 10 minutes should be put on the interconnected power. Using energy storage system is an effective way to smooth the fluctuations of wind farm output. Due to the high cost of the energy storage system, an effective control of the energy state and the BESS charge and discharge rate acquiring a maximum utility of the limited energy storage to improve the output power quality becomes increasingly significant. A coordinated control method for BESS to smooth out wind power fluctuations and to limit wind power ramping rate as required by grid code is proposed, with the BESS energy state well controlled and the predicted wind power used to cope with emergent situation. The effictiveness of the control system is validated through real wind farm cases under MATLAB platform.

scholarly journals A New Model Predictive Control Method for Eliminating Hydraulic Oscillation and Dynamic Hydraulic Imbalance in a Complex Chilled Water System

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3608
Author(s):  
Yang Yuan ◽  
Neng Zhu ◽  
Haizhu Zhou ◽  
Hai Wang
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Control Method ◽  
Water System ◽  
Energy Performance ◽  
Effective Control ◽  
New Model ◽  
Chilled Water ◽  
Chilled Water System ◽  
Hydraulic Oscillation

To enhance the energy performance of a central air-conditioning system, an effective control method for the chilled water system is always essential. However, it is a real challenge to distribute exact cooling energy to multiple terminal units in different floors via a complex chilled water network. To mitigate hydraulic imbalance in a complex chilled water system, many throttle valves and variable-speed pumps are installed, which are usually regulated by PID-based controllers. Due to the severe hydraulic coupling among the valves and pumps, the hydraulic oscillation phenomena often occur while using those feedback-based controllers. Based on a data-calibrated water distribution model which can accurately predict the hydraulic behaviors of a chilled water system, a new Model Predictive Control (MPC) method is proposed in this study. The proposed method is validated by a real-life chilled water system in a 22-floor hotel. By the proposed method, the valves and pumps can be regulated safely without any hydraulic oscillations. Simultaneously, the hydraulic imbalance among different floors is also eliminated, which can save 23.3% electricity consumption of the pumps.

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