scholarly journals Distributed Autonomous Economic Control Strategy for Microgrid Considering Event Triggering Mechanism

2021 ◽  
Author(s):  
Yulong Xiong ◽  
Shihong Miao ◽  
Weichen Yang ◽  
Zhiwei Liu
Keyword(s):  
Control Strategy ◽  
Simulation Analysis ◽  
Function Analysis ◽  
Active Power ◽  
Stable Operation ◽  
Triggering Mechanism ◽  
Event Triggering ◽  
Economic Control ◽  
Event Trigger ◽  
The Stability

To fully adapt to the distributed access of renewable energy, microgrid technology has been developed rapidly. Aiming at the coordination and efficient regulation of distributed resources in microgrid, this paper proposes a distributed autonomous economic control strategy for microgrid considering event triggering mechanism. First, a distributed autonomous economic control architecture is built to provide a distributed operation architecture for optimal regulation of the microgrid. Secondly, a distributed secondary control strategy based on the consensus control theory is established to realize the economic allocation of active power as well as safe and stable operation of the microgrid. On this basis, an event trigger protocol based on the consensus error of the control variables is constructed, which is conductive to reduce redundant communication. The stability of the event trigger protocol is deduced by means of Lyapunov function analysis. The simulation analysis based on the equivalent microgrid verifies that the proposed control strategy can reduce redundant communication and acquire fair distribution of reactive power and active power among DGs, realizing distributed, economical and safe operation of microgrid.

Comparison of two control strategies for VSC-MTDC with wind farm

2021 ◽  
Vol 14 ◽  
Author(s):  
Congshan Li ◽  
Pu Zhong ◽  
Ping He ◽  
Yan Liu ◽  
Yan Fang ◽  
...  
Keyword(s):  
Power Control ◽  
Control Strategy ◽  
Voltage Stability ◽  
Wind Farm ◽  
Control Strategies ◽  
Wind Farms ◽  
Active Power ◽  
Stable Operation ◽  
Active Power Control ◽  
Dc Voltage

: Two VSC-MTDC control strategies with different combinations of controllers are proposed to eliminate transient fluctuations in the DC voltage stability, resulting from a power imbalance in a VSC-MTDC connected to wind farms. First, an analysis is performed of a topological model of a VSC converter station and a VSC-MTDC, as well as of a mathematical model of a wind turbine. Then, the principles and characteristics of DC voltage slope control, constant active power control, and inner loop current control used in the VSC-MTDC are introduced. Finally, the PSCAD/EMTDC platform is used to establish an electromagnetic transient model of a wind farm connected to a parallel three-terminal VSC-HVDC. An analysis is performed for three cases of single-phase grounding faults on the rectifier and inverter sides of a converter station and of the withdrawal of the converter station on the rectifier side. Next, the fault response characteristics of VSC-MTDC are compared and analyzed. The simulation results verify the effectiveness of the two control strategies, both of which enable the system to maintain DC voltage stability and active power balance in the event of a fault. Background: The use of a VSC-MTDC to connect wind power to the grid has attracted considerable attention in recent years. A suitable VSC-MTDC control method can enable the stable operation of a power grid. Objective: The study aims to eliminate transient fluctuations in the DC voltage stability resulting from a power imbalance in a VSC-MTDC connected to a wind farm. Method: First, the topological structure and a model of a three-terminal VSC-HVDC system connected to wind farms are studied. Second, an analysis is performed of the outer loop DC voltage slope control, constant active power control and inner loop current control of the converter station of a VSC-MTDC. Two different control strategies are proposed for the parallel three-terminal VSC-HVDC system: the first is DC voltage slope control for the rectifier station and constant active power control for the inverter station, and the second is DC voltage slope control for the inverter station and constant active power for the rectifier station. Finally, a parallel three-terminal VSC-HVDC model is built based on the PSCAD/EMTDC platform and used to verify the accuracy and effectiveness of the proposed control strategy. Results: The results of simulation analysis of the faults on the rectifier and inverter sides of the system show that both strategies can restore the system to the stable operation. The effectiveness of the proposed control strategy is thus verified. Conclusion: The control strategy proposed in this paper provides a technical reference for designing a VSC-MTDC system for wind farms.

3D Simulation Analysis of Sedimentation of Superhigh Fill

2015 ◽  
Vol 744-746 ◽  
pp. 400-406
Author(s):  
Bi Hong Song ◽  
Jin Chao Yang ◽  
Qing Chen ◽  
Jian Hua Chen ◽  
Da Li
Keyword(s):  
Simulation Analysis ◽  
3D Simulation ◽  
Project Design ◽  
Stable Operation ◽  
Mountainous Areas ◽  
Safe Operation ◽  
Road Base ◽  
The Stability ◽  
Simulated Calculation ◽  
Topographic Relief

The sedimentation deformation of superhigh fill in the mountainous areas is very complicated in law, and will be influenced the topographic relief, and it is specially outstanding for the sedimentation of high-fill project. For the significant project such as airport and road base, in order to guarantee the safe operation of the project during use, it is required to strictly control the post-construction and uneven sedimentation. Therefore, the stability of superhigh fill has become the key to influence the safety and stable operation of projects. In this paper, a simulated calculation is conducted to the ultrahigh fill of expansion project of an airport in Chongqing to analyze its stability, so as to provide references for the project design and construction.

A control strategy for the stable operation of shunt active power filters in power grids

Energy ◽  
2016 ◽  
Vol 96 ◽  
pp. 325-334 ◽  
Author(s):  
Majid Mehrasa ◽  
Edris Pouresmaeil ◽  
Sasan Zabihi ◽  
Eduardo M.G. Rodrigues ◽  
João P.S. Catalão
Keyword(s):  
Control Strategy ◽  
Active Power ◽  
Power Grids ◽  
Stable Operation ◽  
Active Power Filters ◽  
Power Filters

Compressor Instability Active Control via Closed-Coupled Valve and Throttle Actuators

2015 ◽  
Vol 32 (3) ◽  
Author(s):  
Hanlin Sheng ◽  
Wei Huang ◽  
Tianhong Zhang ◽  
Xianghua Huang
Keyword(s):  
Numerical Simulation ◽  
Active Control ◽  
Control Strategy ◽  
Simulation Analysis ◽  
Axial Flow ◽  
Stable Operation ◽  
Compression System ◽  
Control Gain ◽  
System States ◽  
Aero Engines

AbstractActive control techniques are widely researched to expand the stable operating range of axial flow compressors in aero-engines. First, an active controller using closed-coupled valve as actuator has been analyzed using numerical simulation. Analysis results showed that the stability of the controller is affected by system states under large B-parameter of compression system and need a larger control gain besides. Second, using closed-coupled valve and throttle as actuators simultaneously, a novel active control strategy has been proposed. Throttle feedback control is used to decrease the nominal B-parameter of compression system to improve control performance of closed-coupled valve controller. Lastly, numerical simulation has been carried out to evaluate the proposed control strategy. Simulation results showed that the novel controller extends the stable operation range of compression system greatly.

scholarly journals Constant Frequency Control Strategy of Microgrids by Coordinating Energy Router and Energy Storage System

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Zheng Lan ◽  
Junzhang Wang ◽  
Jinhui Zeng ◽  
Dong He ◽  
Fan Xiao ◽  
...  
Keyword(s):  
Energy Storage ◽  
Control Strategy ◽  
Frequency Control ◽  
Storage System ◽  
Energy Storage System ◽  
Maximum Efficiency ◽  
Stable Operation ◽  
Power Fluctuation ◽  
Constant Frequency ◽  
The Stability

In this paper, a constant frequency control strategy of a microgrid by coordinating energy router (ER) and energy storage system is proposed to solve the frequency fluctuation problem of microgrid, in which ER is the core of the energy management system. The interface converter of ER connected to the microgrid adopts the virtual synchronous generator (VSG) control, which adjusts the mechanical reference power in real time according to the state of charge (SOC) of the energy storage. The energy storage system adopts constant voltage and constant frequency (V/F) control to maintain the frequency and voltage stability of microgrid. The energy storage system with fast charge and discharge responds to the power fluctuation of the microgrid. ER maintains the stability of the energy storage capacity through bidirectional power regulation. When the energy storage system fails, the frequency and voltage droop characteristics of ER controlled by VSG will play a role in maintaining the stable operation of the microgrid. By the coordinating control strategy, the maximum efficiency of intermittent distributed energy can be guaranteed, and the stability, reliability, and grid-connection friendliness of the microgrid operation can be improved. Simulation results prove the effectiveness of the proposed control strategy.

Petri net-based voltage control strategy under false data injection attack

2020 ◽  
Vol 42 (14) ◽  
pp. 2622-2631
Author(s):  
Rong Fu ◽  
Yue Xu ◽  
Yi Tang ◽  
Qi Wang
Keyword(s):  
Power System ◽  
Petri Nets ◽  
Control Strategy ◽  
Smart Grids ◽  
Voltage Control ◽  
Cyber Attacks ◽  
Voltage Control Strategy ◽  
Event Triggering ◽  
Event Trigger ◽  
Load Tap Changer

With the increase in connectivity and automation of smart grids, the scale and complexity of them has multiplied, which increases the opportunities for cyber-attacks in smart grids. For the problems where the power system cannot be detected in time and the corresponding measures cannot be taken in time, this paper proposes a voltage control strategy based on Petri nets and event triggering mechanism. The time and probability of success of an attack can affect the assessment of its consequences. In order to understand the influence of attack on power system, the corresponding modeling method based on Petri nets is given. Adding event trigger mechanism to the voltage control strategy using on-load tap-changer can effectively control the voltage fluctuation of power system in time.

scholarly journals Virtual Inertia and Mechanical Power-Based Control Strategy to Provide Stable Grid Operation under High Renewables Penetration

2019 ◽  
Vol 9 (6) ◽  
pp. 1043 ◽  
Author(s):  
Majid Mehrasa ◽  
Edris Pouresmaeil ◽  
Hamid Soltani ◽  
Frede Blaabjerg ◽  
Maria Calado ◽  
...  
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Angular Frequency ◽  
Active Power ◽  
Mechanical Power ◽  
Control Technique ◽  
Stable Operation ◽  
Active And Reactive Power ◽  
Virtual Inertia

This paper presents a virtual inertia and mechanical power-based control strategy to provide a stable operation of the power grid under high penetration of renewable energy sources (RESs). The proposed control technique is based on a new active and reactive power-based dynamic model with the permanent magnet synchronous generator (PMSG) swing equation, in which all PMSG features i.e., inertia and mechanical power are embedded within the controller as the main contribution of this paper. To present an accurate analysis of the virtual PMSG-based parameters, the desired zero dynamics of the grid angular frequency are considered to evaluate the effects of virtual mechanical power (VMP) on the active and reactive power sharing, as well as the investigation of virtual inertia variations for the grid angular frequency responses. Moreover, by considering various active power errors and virtual inertia, the impacts of active power error on reactive power in the proposed control technique, are precisely assessed. Simulation results are employed in Matlab/Simulink software to verify the stabilizing abilities of the proposed control technique.

Modelling and control of a Magneto-Rheological elastomer for impact reduction

2019 ◽  
Vol 13 (3) ◽  
pp. 5259-5277 ◽  
Author(s):  
Mohd Sabirin Rahmat ◽  
Khisbullah Hudha ◽  
Zulkiffli Abd Kadir ◽  
Nur Rashid Mat Nuri ◽  
Noor Hafizah Amer ◽  
...  
Keyword(s):  
Impact Energy ◽  
Control Strategy ◽  
Hybrid Control ◽  
Simulation Analysis ◽  
Input Current ◽  
Impact Reduction ◽  
Force Tracking ◽  
The Stability ◽  
Magneto Rheological ◽  
The Impact

This article presents the simulation analysis on the effectiveness of impact reduction control based magneto-rheological elastomer isolator device (MREID). The MREID is one of the impact isolator devices that produce controllable stiffness by controlling the input current supply to the device coil. In order to control the input current for MREID, a hybrid control structure combining the skyhook and active force control strategy (HYSAFC) is proposed. Firstly, the characteristics of MREID in squeeze mode are investigated systematically in order to establish the relationship between the supply input current to the subsequent force and impact energy within the MREID. The proposed control strategy is used for force tracking control in determining the amount of input current to be applied to the MREID. The desired input current is determined by a current generator that is developed using inverse ANFIS technique which will regulate the current amount based on the desired force and impact energy. The effectiveness of the actively controlled MREID is evaluated using MATLAB simulations by comparing the performance of the MREID controlled by skyhook control against a passive damper. It is shows that the proposed controller recorded better response compared to skyhook controller, thus improving the stability and the effectiveness in controlling the MRE isolator device.

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