scholarly journals Implementation of Dynamic Virtual Inertia Control of Supercapacitors for Multi-Area PV-Based Microgrid Clusters

2020 ◽  
Vol 12 (8) ◽  
pp. 3299 ◽  
Author(s):  
Li Yang ◽  
Zhijian Hu
Keyword(s):  
Dynamic Stability ◽  
Control Strategy ◽  
Control Method ◽  
Integral Manifold ◽  
Dynamic Performance ◽  
Control Approach ◽  
Autonomous Mode ◽  
Inertial Control ◽  
Inertia Control ◽  
Dynamic Inertia

In order to improve the dynamic stability of multi-area microgrid (MG) clusters in the autonomous mode, this study proposes a novel fuzzy-based dynamic inertia control strategy for supercapacitors in multi-area autonomous MG clusters. By virtue of the integral manifold theory, the interactive influence of inertia on dynamic stability for multi-area MG clusters is explored in detail. The energy function of multi-area MG clusters is constructed to further analyze the inertia constant. Based on the analysis of the mechanism, a control strategy for the fuzzy-based dynamic inertia control of supercapacitors for multi-area MG clusters is further proposed. For each sub-microgrid (sub-MG), the gain of the fuzzy-based dynamic inertia control is self-tuned dynamically, with system events being triggered, so as to flexibly and robustly enhance the dynamic performance of the multi-area MG clusters in the autonomous mode. To verify the effectiveness of the proposed control scheme, a three-area photovoltaic (PV)-based MG cluster is designed and simulated on the MATLAB/Simulink platform. Moreover, a comparison between the dynamic fuzzy-based inertial control method and an additional droop control method is finally presented to validate the advantages of the fuzzy-based dynamic inertial control approach.

Design and Simulation of the Intelligent Control of the Greenhouse Temperature

2013 ◽  
Vol 423-426 ◽  
pp. 2851-2854
Author(s):  
Lin Zhao
Keyword(s):  
Mathematical Model ◽  
Intelligent Control ◽  
Control Strategy ◽  
Pid Control ◽  
Time Variation ◽  
Performance Index ◽  
Control Method ◽  
Dynamic Performance ◽  
On Line ◽  
Greenhouse Control

In greenhouse control , The production process of the greenhouse environment has many characteristics, such as time variation, nonlinearity and uncertainty. It's very difficult to build an accurate mathematical model. The effect of the conventional control method is not satisfied. Fuzzy control is used to adjust the parameters of PID control on-line in the aspect of control strategy, accordingly it can make static and dynamic performance index more ideal.

scholarly journals Application of Repetitive Control and ANFIS-PI Compound Control Strategy in APF

2021 ◽  
Vol 2121 (1) ◽  
pp. 012037
Author(s):  
Mengtao Zhang ◽  
Tao Sui
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Balance Control ◽  
Dynamic Performance ◽  
Repetitive Control ◽  
Response Speed ◽  
Fast Response ◽  
Application Process ◽  
Actual Application ◽  
Compound Control

Abstract In order to effectively solve a series of problems caused by harmonics in power system, an active power filter based on ANFIS-PI and repetitive control is designed. The traditional single control method cannot balance control accuracy and response speed, so a compound control strategy is adopted. Repetitive control can produce the same output as the harmonic current, so it can achieve zero steady-state error tracking compensation for each harmonic, but its dynamic performance is not good. As a traditional control method, the PI control method has a fast response speed, but in the actual application process, when the load changes suddenly, that is, when the system parameters change, its tracking effect is not ideal. Therefore, a composite control strategy of ANFIS-PI and repeated control is proposed. It has been proved that its compensation accuracy and dynamic response speed have been significantly improved.

scholarly journals An enhanced control strategy based imaginary swapping instant for induction motor drives

2022 ◽  
Vol 12 (2) ◽  
pp. 1102
Author(s):  
Iliass Rkik ◽  
Mohamed El Khayat ◽  
Abdelali Ed-Dahhak ◽  
Mohammed Guerbaoui ◽  
Abdeslam Lachhab
Keyword(s):  
Induction Motor ◽  
Control Strategy ◽  
Dynamic Performance ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Motor Drives ◽  
Torque Control ◽  
Control Approach ◽  
Effective Period ◽  
Vector Modulation

<p>The main aim of this paper is to present a novel control approach of an induction machine (IM) using an improved space vector modulation based direct torque control (SVM-DTC) on the basis of imaginary swapping instant technique. The improved control strategy is presented to surmount the drawbacks of the classical direct torque control (DTC) and to enhance the dynamic performance of the induction motor. This method requires neither angle identification nor sector determination; the imaginary swapping instant vector is used to fix the effective period in which the power is transferred to the IM. Both the classical DTC method and the suggested adaptive DTC techniques have been carried out in MATLAB/SimulinkTM. Simulation results shows the effectiveness of the enhanced control strategy and demonstrate that torque and flux ripples are massively diminished compared to the conventional DTC (CDTC) which gives a better performance. Finally, the system will also be tested for its robustness against variations in the IM parameters.</p>

Research on Ship Shaft Power Generation System Based on BDFG and its Grid-Connected Control Strategy

2013 ◽  
Vol 448-453 ◽  
pp. 2830-2833 ◽  
Author(s):  
Nai Jun Shen ◽  
Hong Da Liu ◽  
Yu Pang ◽  
Hai Ning Yu ◽  
Hai Lan
Keyword(s):  
Power Generation ◽  
Control Strategy ◽  
Reactive Power ◽  
Control Method ◽  
Dynamic Performance ◽  
Operating Mode ◽  
Generation System ◽  
Shaft Power ◽  
Power Generation System ◽  
Save Energy

The technology of Ship Shaft Power Generation System (SSPGS) is an effective way to save energy, Compared to the traditional SSPGS, the shaft power generation systems based on BDFG has the advantages of smaller capacity of the inverter, lower capital operational costs and higher reliability. In order to utilize rationally the resources, the paper analyses the ship operating mode, and presents the control strategy when the system working at grid-connected mode. The proposed vector control method is developed on the power winding (PW) stator flux frame and can be used to control both the active and reactive power on the grid-connected mode. The generator model and the control system are developed in Matlab/Simulink. The results show that the control strategy has good dynamic performance when the ship speed and power are change.

scholarly journals The Nonlinear Single Controller of DGEN380 Aero Engine Design

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Jie Bai ◽  
Shuai Liu ◽  
Wang Wei
Keyword(s):  
Control Method ◽  
Sliding Mode ◽  
Dynamic Performance ◽  
Control Approach ◽  
Engine Control System ◽  
Nonlinear Dynamic Equation ◽  
Aero Engine ◽  
Single Controller ◽  
Power Point ◽  
The Impact

The advanced nonlinear sliding mode control method of DGEN380 aero engine is presented in this paper. This aero engine is a small high bypass ratio turbofan engine by which the nonlinear control approach of the aero engine is invested. And this paper focuses on the power management function of the aero engine control system which includes steady control and transient control. The mathematical model of DGEN380 aero engine is built by a set of nonlinear dynamic equation that is validated by experimental data. The single controller based on sliding mode approach is designed that can keep some certain thrust levels during steady state and maintain repeatable performance during transient operation from one requested thrust level to another. The single controller can offset the impact of the signal noise and harmonic disturbance at a certain power point. And the dynamic performance of the single controller is satisfactory at the transient process. The experiment is conducted by aero engine test bench for the single control.

scholarly journals Dynamic Frequency Support from a DFIG-Based Wind Turbine Generator via Virtual Inertia Control

2020 ◽  
Vol 10 (10) ◽  
pp. 3376 ◽  
Author(s):  
Dejian Yang ◽  
Enshu Jin ◽  
Jiahan You ◽  
Liang Hua
Keyword(s):  
Wind Speed ◽  
Power Systems ◽  
Wind Turbine ◽  
Control Strategy ◽  
Control Method ◽  
Frequency Stability ◽  
Virtual Inertia ◽  
Inertia Control ◽  
System Frequency ◽  
Inertia Response

As the penetrated level of wind in power grids increases, the online system inertia becomes weak. Doubly-fed induction generator (DFIG)-based wind turbine generators (WTGs) are required to provide virtual inertia response to support system frequency. The present inertia control strategy with fixed control gain is not suitable and may cause stall of the DFIG-based WTG, as the virtual inertia response potential from the DFIG-based WTG is different with various wind speed conditions. This paper addresses a virtual inertia control method for the DFIG-based WTGs to improve the system frequency stability without causing stalling of the wind turbine for various wind speed conditions. The effectiveness of the proposed virtual inertia control method is investigated in a small system embedded with the DFIG-based WTG. Results demonstrate that the proposed virtual inertia strategy improves the frequency stability without causing the rotor speed security issue. Thus, the proposed control strategy can secure the dynamic system frequency security of power systems under the scenarios of full and partial loads, and, consequently, the proposed method provides a promising solution of ancillary services to power systems.

scholarly journals Empirical multi-degree-of-freedom-generalized minimum variance control for buildings during earthquakes

2018 ◽  
Vol 37 (1) ◽  
pp. 3-30
Author(s):  
Mohamed Azira ◽  
Lakhdar Guenfaf
Keyword(s):  
Control Strategy ◽  
Structural Control ◽  
Control Method ◽  
Linear Representation ◽  
Minimum Variance ◽  
Empirical Method ◽  
Degree Of Freedom ◽  
Soil Parameters ◽  
Earthquake Excitation ◽  
Control Approach

Structural control of a multi-degree-of-freedom building under earthquake excitation is investigated in this paper. The ARMAX model calculation is developed for a linear representation of multi-degree-of-freedom structure. A control approach based on the generalized minimum variance algorithm is developed and presented. This approach is an empirical method to control the story unit regardless of the coupling with other stories. Kanai-Tajimi and Clough–Penzien models are used to generate the seismic excitations. Those models are calculated using the specific soil parameters. In order to test the control strategy performances under real strong earthquakes, the structure has been subjected to EL Cento earthquake. RST controller form shows the stability conditions and the optimality of the control strategy. Simulation tests using a 3DOF structure are performed and show the effectiveness of the control method using of the empirical method.

Enhancement the Dynamic Performance of Islanded Microgrid Using a Coordination of Frequency Control and Digital Protection

2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Emad A. Mohamed ◽  
Yasunori Mitani
Keyword(s):  
Dynamic Stability ◽  
Frequency Control ◽  
Dynamic Performance ◽  
Load Frequency Control ◽  
Renewable Energy Resources ◽  
Promising Solution ◽  
Islanded Microgrid ◽  
Virtual Inertia ◽  
Inertia Control ◽  
Digital Protection

Abstract This paper presents an assortment study between the virtual inertia control (VIC)-based a new optimal PID controller, load frequency control (LFC), and the digital protection for an islanded microgrid (MG) taking into consideration the emerging level of renewable energy resources (RERs), which is a promising solution. However, the reduction in system inertia due to increasing the amount of RERs causes undesirable impact to MG dynamic stability, threatens the system security, and could lead to complete blackouts as well as damages to the system equipment. Therefore, maintaining the dynamic security in MGs is one of the important challenges, which considered in this paper using a specific design of a digital over/under frequency relay (OUFR) with coordination of the VIC to protect the MG against high-frequency variations. To prove the effectiveness of the proposed coordination strategy, it has been tested considering sudden load change, high integration of RERs. Moreover, the sensitivity analysis of the presented technique was examined by varying the inertia level of MG system. The results stated that the proposed coordination can effectively regulate the MG frequency and maintain the dynamic stability and security.

scholarly journals Adaptive Control Strategy of Energy Storage System Participating in Primary Frequency Regulation

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 687
Author(s):  
Chaoxiong Fang ◽  
Yuchen Tang ◽  
Rong Ye ◽  
Zhangsui Lin ◽  
Zhenshan Zhu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Control Strategy ◽  
Storage System ◽  
Energy Storage System ◽  
Frequency Regulation ◽  
Droop Control ◽  
Inertial Control ◽  
Adaptive Control Strategy ◽  
Inertia Control ◽  
Primary Frequency

In order to solve the capacity shortage problem in power system frequency regulation caused by large-scale integration of renewable energy, the battery energy storage-assisted frequency regulation is introduced. In this paper, an adaptive control strategy for primary frequency regulation of the energy storage system (ESS) was proposed. The control strategy combined virtual droop control, virtual inertial control, and virtual negative inertial control. The virtual inertial control was used to reduce the frequency change rate, and the virtual droop control was used to reduce the steady-state frequency deviation. The virtual droop control and the virtual inertia control were adopted in the frequency deterioration stage to slow down the frequency drop. While in the frequency recovery stage, the virtual negative inertia control worked together with the virtual droop control to accelerate the frequency recovery. Besides, the coefficients of the control methods were related to the state of charge (SOC) of ESS to avoid over-charging and over-discharging of the battery. Finally, a simulation model was built in MATLAB/SIMULINK, and case studies were conducted to verify the proposed control strategy. Results showed that the proposed method could meet the demand for frequency regulation and was beneficial to the cycle life of ESS.

Research on the Positioning Servo Control Strategy for CNC System

2013 ◽  
Vol 694-697 ◽  
pp. 1851-1854
Author(s):  
Li Bing Zhang ◽  
Ting Wu
Keyword(s):  
Control Method ◽  
Dynamic Performance ◽  
Servo Control ◽  
Numerical Control ◽  
Cnc System ◽  
Control Approach ◽  
System A ◽  
Position Servo Control ◽  
Position Servo ◽  
Rolling Optimization

In order to overcome thelimitation of the position servo control method of computerized numerical control(CNC) system, a control approach of generalized predictive control (GPC) ispresented in this paper. In the method, the GPC model calculates the optimalcontrol rate through the predictive model and rolling optimization as thecontroller of the position servo system. Compared with GPC and proportional-integral-derivative(PID) control, the simulative and experimental results show that the proposedcontrol approach has better the dynamic performance, steady-state performance,and robustness.

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