Microgrid Operation under Frequency Control Method

2014 ◽  
Vol 698 ◽  
pp. 716-721 ◽  
Author(s):  
D.V. Armeev ◽  
A.Y. Arestova ◽  
Y.A. Abramova
Keyword(s):  
Distribution System ◽  
Control Method ◽  
Control Strategies ◽  
Frequency Control ◽  
Load Shedding ◽  
Technical Problems ◽  
Emergency Control ◽  
Interconnected Power System ◽  
Control Actions ◽  
Intensive Development

Intensive development of cogeneration and SmartGrid technologies provide an opportunity to form Microgrid within a distribution system. Microgrid can act as part of an interconnected power system or operate in isolated mode. Islanding is performed under faults, power interruption, etc. There are several technical problems when Microgrid resynchronizes to the grid. This paper presents three control strategies to be used to reconnect with the utility: 1. without any emergency control actions; 2. frequency load shedding; 3. frequency control method.

scholarly journals Design and Analysis of DYC and Torque Vectoring using Multiple-Frequency Control Electronic Differential in an Independent Rear Wheel Driven Electric Vehicle

2019 ◽  
Vol 9 (2) ◽  
pp. 307-315
Keyword(s):  
Control System ◽  
Electric Vehicle ◽  
Control Method ◽  
Sliding Mode ◽  
Control Strategies ◽  
Frequency Control ◽  
Multiple Frequency ◽  
Traction Control ◽  
Traction Control System ◽  
Torque Vectoring

Electric vehicle (EV) are being embraced in recent times as they run on clean fuel, zero tail emission and are environment-friendly. Recent advancements in the field of power electronics and control strategies have made it possible to the advent in the vehicle dynamics, efficiency and range. This paper presents a design for traction control system (TCS) for longitudinal stability and Direct Yaw Control (DYC) for lateral stability simultaneous. The TCS and DYC is based on multiple frequency controlled electronic differential with a simple and effective approach. Along with it, some overviews have been presented on some state of the art in traction control system (TCS) and torque vectoring. The developed technique reduces nonlinearity, multisensory interfacing complexity and response time of the system. This torque and yaw correction strategy can be implemented alongside fuzzy control, sliding mode or neural network based controller. The effectiveness of the control method has been validated using a lightweight neighbourhood electric vehicle as a test platform. The acquired results confirm the versatility of proposed design and can be implemented in any DC motor based TCS/DYC.

scholarly journals Ride-Through Control Method for the Continuous Commutation Failures of HVDC Systems Based on DC Emergency Power Control

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4183 ◽  
Author(s):  
Chao Xiao ◽  
Wei Han ◽  
Jinxin Ouyang ◽  
Xiaofu Xiong ◽  
Wei Wang
Keyword(s):  
Power Control ◽  
Direct Current ◽  
Control Method ◽  
Control Strategies ◽  
Equivalent Model ◽  
Emergency Control ◽  
Emergency Power ◽  
Ac Systems ◽  
The Stability ◽  
The Impact

Continuous commutation failures (CFs) are serious malfunctions in line-commutated converter high-voltage direct current (HVDC) systems that cause the continuous and rapid sag of transmitted power and may threaten the stability of AC systems. The conventional emergency control strategies of AC systems exhibit difficulty in responding quickly and accurately. After suffering from continuous CFs, the forced blocking of direct current (DC) converter to prevent AC system instability might also cause other adverse effects. This study proposes a ride-through control method to improve the endurance capability of AC systems against continuous CFs. An active power output model of inverter station under continuous CFs is built, while considering the process and mechanism of CFs. The impact of continuous DC power sag on the stability of sending-end system is analyzed through a four-area AC/DC equivalent model. A rolling calculation model for the power angle and acceleration area variations of the sending-end system during continuous CFs is established on the basis of model predictive control theory. A calculation method for the emergency power control reference is obtained by using the aforementioned models. Lastly, a ride-through control method for continuous CFs is developed by utilizing the emergency control of adjacent HVDC link. Simulation results show that the proposed control method can improve the endurance capability of an AC system to continuous CFs and reduce blocking risk in an HVDC link.

scholarly journals Voltage and Frequency Control of Balanced/Unbalanced Distribution System Using the SMES System in the Presence of Wind Energy

Electricity ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 205-224
Author(s):  
Hossam S. Salama ◽  
Istvan Vokony
Keyword(s):  
Fuzzy Logic ◽  
Wind Energy ◽  
Distribution System ◽  
Fuzzy Logic Control ◽  
High Performance ◽  
Control Method ◽  
Magnetic Energy ◽  
Frequency Control ◽  
Control Technique ◽  
Logic Control

This paper presents an effective solution to overcome the problem caused by intermittent energy sources that are connected to a balanced/unbalanced distribution system using a superconducting magnetic energy storage (SMES) system by mitigating the voltage and frequency fluctuations during wind gusts. The fuzzy logic control technique (FLC) is used with SMES to improve the voltage and frequency. A squirrel cage induction generator (SCIG) is applied as the wind energy generator. The IEEE 33-bus distribution system is used to validate the proposed method. Buses 18 33 are the weakest points in this system; thus, the wind and SMES systems are connected to the system at these buses. We used MATLAB/Simulink to simulate the performance of the IEEE 33-bus system (balanced/unbalanced) considering the SMES, wind system, and fuzzy logic control (FLC). The simulation results show the high performance of the proposed control method to alleviate the voltage and frequency fluctuation and achieve the power leveling strategy of the studied system.

scholarly journals An Advanced Robust AVR-PSS Based H2 and H∞ Frequency Approachs Simulated Under a Realized GUI

2015 ◽  
Vol 15 (3) ◽  
pp. 468
Author(s):  
Kabi Wahiba ◽  
Ghouraf Djamel Eddine ◽  
Naceri Abdellatif
Keyword(s):  
Transient Stability ◽  
Control Method ◽  
Control Strategies ◽  
Frequency Control ◽  
Optimization Technique ◽  
Synchronous Generators ◽  
H2 Control ◽  
Parameters Uncertainty ◽  
Dynamic Performances ◽  
Single Machine Infinite Bus

This article present a comparative study between two advanced robust frequency control strategies and their implementation using our realised Graphical User Interface ‘GUI’ under MATLAB software: the first method based on loop-shaping H∞ optimization technique and the second on robust H2 control method (LQG controller associated with KALMAN filter), and applied on automatic excitation control of synchronous generators, to improve transient stability and robustness of a single machine- infinite bus (SMIB) system operating in different several conditions. The computer simulation results (static and dynamic stability), with test of robustness against machine parameters uncertainty (electric and mechanic), have proved that good dynamic performances, showing a stable system responses almost insensitive to large parameters variations, and more robustness using robust H∞ controller in comparison with H2 approach by exploiting our developed GUI interface in this work.

Generator-Side Converter Control Strategies of Synchronous Wind Turbines Based on the MPPT

2014 ◽  
Vol 1070-1072 ◽  
pp. 238-242
Author(s):  
Cong Chen ◽  
Hui Liu ◽  
Shu Shan Li ◽  
Shao Jie Gao
Keyword(s):  
Wind Speed ◽  
Control Strategy ◽  
Control Method ◽  
Control Strategies ◽  
Frequency Control ◽  
Response Speed ◽  
Hill Climbing ◽  
Constant Frequency ◽  
Variable Speed Constant Frequency ◽  
Measured Wind Speed

Traditional wind turbine converter uses wind speed sensors to measure wind speed as a control conditioning signal, but it makes the measured wind speed have some delay, which affecting the response speed of motor control.For this purpose this paper presents a new control strategy of synchronous permanent magnet wind generator-side converter.By using the combination of hill-climbing searching algorithm and synchronous motor vector control of decoupling to realize the maximum wind capture and variable speed constant frequency control. The simulation results validate the rapidity and feasibility of the control method. And it shows that the control strategy can be quickly and accurately to achieve control objectives. It also omits wind speed measuring sensor and reduces cost compared with traditional control strategy.

Study on Narrow-Gauge Traction Locomotive Control System

2011 ◽  
Vol 418-420 ◽  
pp. 2074-2077
Author(s):  
Jian Zong ◽  
Yi Ruan ◽  
Ming Hui Chen ◽  
Li Bo Xu
Keyword(s):  
Control System ◽  
Power Distribution ◽  
Control Method ◽  
Control Strategies ◽  
Frequency Control ◽  
Good Control ◽  
Drive System ◽  
Motor Drive ◽  
Mechanical Feature ◽  
Motor Drive System

Most narrow-gauge vehicles driven by DC motor now, as DC drive due to power constraints and high maintenance costs, most of them will gradually be replaced by AC drives. But VVVF(Variable Voltage Variable Frequency) control method adopt in some running narrow-track traction locomotives, that can reduce over-current with load starting and should be compensated at low frequency. Based on study the Control strategies of narrow-track locomotives, comparing with the characteristics of power distribution of dual-motor drive system. The motor ought to have the same mechanical feature in dual-motor drive system, vector control strategy select in the control system. Experiments prove the system has good performance of stability, reliability, and good control performance, which can meet the narrow-track traction locomotive control requirements.

scholarly journals Application of Model Predictive Control for Large-Scale Inverted Siphon in Water Distribution System in the Case of Emergency Operation

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2733
Author(s):  
Zheli Zhu ◽  
Guanghua Guan ◽  
Zhonghao Mao ◽  
Kang Wang ◽  
Shixiang Gu ◽  
...  
Keyword(s):  
Model Predictive Control ◽  
Linear Model ◽  
Predictive Control ◽  
Distribution System ◽  
Large Scale ◽  
Control Method ◽  
Water Release ◽  
Emergency Control ◽  
Inverted Siphon ◽  
Combination System

The emergency control of Menglou~Qifang inverted siphon, which is about 72 km long, is the key to the safety of the Northern Hubei Water Transfer Project. Given the complicated layout of this project, traditional emergency control method has been challenged with the fast hydraulic transient characteristics of pressurized flow. This paper describes the application of model predictive control (MPC), a popular automatic control algorithm advanced in explicitly accounting for various constraints and optimizing control operation, in emergency condition. For the fast prediction to the pipe-canal combination system, a linear model for large-scale inverted siphon proposed by the latest research and the integrator-delay (ID) model for open canals are used. Simulation results show that the proposed MPC algorithm has promising performance on guaranteeing the safety of the project when there are sudden flow obstruction incidents of varying degrees downstream. Compared with control groups, the peak pressure can be reduced by 17.2 m by MPC under the most critical scenario, albeit with more complicated gates operations and more water release (up to 9.75 × 104 m3). Based on the linear model for long inverted siphon, this work highlights the applicability of MPC in the emergency control of large-scale pipe-canal combination system.

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