The optimal generator dispatching with uncertain conditions for grid-connected microgrid

2020 ◽  
Vol 3 (1) ◽  
pp. First
Author(s):  
Phan Quoc Dung ◽  
Phan Thi Thanh Binh ◽  
Pham Dinh Minh ◽  
Tran Minh Hung ◽  
Nguyen Duc Hung
Keyword(s):  
Low Voltage ◽  
Circuit Breaker ◽  
Optimal Solution ◽  
Source Power ◽  
Distributed Generations ◽  
Grid Connection ◽  
Distributed Generators ◽  
Optimal Value ◽  
Micro Grid ◽  
The Right

Nowadays, the penetration of wind and solar sources is relatively high in Micro Grid. Wind speed and solar radiation forecasting hardly gives an exact value and leads to the values in intervals. Therefore forecasted output powers of these sources are also in the intervals. The constraint on power balance in Micro Grid has the right-hand-side uncertainty, in the interval. So for Micro-Grid in grid connection mode, the presence of the distributed generations based on wind and solar energy sources makes optimal dispatching problems of distributed generations become an uncertainty problem. The optimal solutions for the lower and upper ends of this interval are the best and the worst optimal solution. This paper proposes to treat the above problem as the optimal problem with two objectives: reach the best and the worst solution. The principle of fuzzy set and the Particle Swarm Optimization algorithm will be applied for solving the multi-objective problem. The final optimal value will belong to an interval. Meanwhile, the output power of the swing generator varies to respond to the uncertainty of wind and solar source power. An example of a low-voltage MG with three distributed generators is considered with two cases: connecting to the utility grid via the circuit breaker and via power controller.

AGC Control of Scheduling with Distributing Power Generation and Performance Study

2012 ◽  
Vol 220-223 ◽  
pp. 101-106
Author(s):  
Xing Wan ◽  
Xiao Li Zhang
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Low Voltage ◽  
Performance Study ◽  
Power Distribution System ◽  
Power Resources ◽  
Distributed Generators ◽  
Load Demand ◽  
Micro Grid ◽  
And Performance

Abstract: Scheduling plans of running a large, traditional power grid often distribute power resources in each small system. And they didn’t take the scope of scheduling operation within the power distribution system into consideration. With the trend separate transmission and distribution, the number of distributed generators that installed is growing rapidly. More and more micro-grid network composed of low-voltage distribution power network are formed. With effective regulation, this system can satisfy local load demand and support networking. The establishment of mechanisms such as AGC support services, with be vital to insure the power quality and reliability. Keywords: distributing power Micro-Grid DG AGC

scholarly journals Fault characteristics of Inverter-Interfaced Distributed Generation

2021 ◽  
Vol 237 ◽  
pp. 02020
Author(s):  
Xiaoqin Ma ◽  
Hui Lv ◽  
Wenjuan Xiao
Keyword(s):  
Distributed Generation ◽  
Control Strategy ◽  
Theoretical Foundation ◽  
Operation Mode ◽  
Synchronous Generators ◽  
Distributed Generations ◽  
Distributed Generators ◽  
Depth Analysis ◽  
Micro Grid ◽  
Output Characteristics

Distributed generations can be divided into traditional synchronous generators and inverter interfaced distributed generations (IIDG) according to their different operation mode. While the fault characteristics of IIDG is different from traditional Distributed Generators, the in-depth analysis on output characteristics and fault characteristics of IIDG are the foundation of micro grid protection. The mathematical models under P/Q and V/F control strategy are discussed. After simplifying its model, the fault characteristics of IIDG under P/Q and V/F control strategy are studied using the simulation of PSCAD/EMTDC. The analysis on the fault characteristics of IIDG that lays the theoretical foundation for the micro-grid relay protection.

scholarly journals Simulation and Implementation PID Controlling Buck Converter DC

2021 ◽  
Vol 3 (2) ◽  
pp. 72-81
Author(s):  
I Wayan Raka Ardana ◽  
Lalu Febrian Wiranata ◽  
Ida Bagus Irawan Purnama
Keyword(s):  
Embedded System ◽  
Low Voltage ◽  
Buck Converter ◽  
Source Power ◽  
Set Point ◽  
Time Value ◽  
Minimal Error ◽  
Optimal Value ◽  
Similar Peak ◽  
Initial Target

Regulating the output voltage based on the desired set point is useful for many applications. However, getting the optimal value using fast computation with minimal error is still challenging. This paper aims to design, simulate, and implement a second-order Buck-Boost DC-DC converter circuit so that the voltage result according to the desired set point can be achieved. Initially, testing is conducted using Matlab Simulink. Then, Proteus is used to test the computation of the program on embedded systems in which the result is implemented in C. In low voltage power electronics applications, this approach has never been used to determine the output form. To determine the value of Kp, Ki, dan Kd, PID, Ziger Nichos (Guo, 2002). method is used. Meanwhile, tuning is done through Matlab. For simulation on Proteus, the output is tested by setting the setpoint values of 3.0, 2.5, and 1.7 volts. This aims to see the pattern of changes in the simulation. The simulation results with Proteus show that they have similar peak values but with different overshoot values. This is because the simulation must pass the reference voltage before it drops to the desired setpoint value. Proteus simulation can also help to prove embedded system programs are running correctly. On the other hand, the value of 1.7 volts is used as a setpoint in device implementation. This is due to the determination that the setpoint voltage in the implementation does not exceed the value of the source/power supply. The results show that for the rise time value of 378,770 ms, Overshoot and settling time are 11.798% and 0, respectively. This means the result produces an optimal value which is a return to the initial target. The optimal factor is assessed from the ability to minimize existing errors as well as having the shortest possible computational process.

A Review of Classical and Modern Control Techniques Utilized in Modern Microgrids

2021 ◽  
Vol 14 ◽  
Author(s):  
Muhammad Hamza Shahbaz ◽  
Arslan Ahmed Amin
Keyword(s):  
Control Strategies ◽  
Optimal Solution ◽  
Energy Resources ◽  
Control Methods ◽  
Research Gaps ◽  
Control Techniques ◽  
Micro Grid ◽  
Exciting Development ◽  
Micro Grids ◽  
Modern Control

: Because of the consistently expanding energy request, the introduction of a decentralized micro-grid based on energy resources will soon be the most exciting development in the power system. Micro-grids, which are mainly based on inverters, are becoming more popular as they can handle different forms of renewable energy effectively. However, one of the most challenging areas of research is their control. In the last few years, many control strategies have been developed. In this review, different control methods have been discussed that apply to the micro-grid system. Furthermore, the comparative analysis of classical and modern control strategies is also considered. This survey guides the new researchers about all available control strategies and room for improvement towards the optimal solution of the micro-grid control techniques. It also identifies several research gaps and future trends therein as well as provides a solution to manage problems in MGs. The strategies are then compared based on their applicability to different control requirements.

scholarly journals Approaching the Optimal Solution of the Maximal α-quasi-clique Local Community Problem

Electronics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1438
Author(s):  
Patricia Conde-Cespedes
Keyword(s):  
Graph Theory ◽  
Community Detection ◽  
Local Community ◽  
Optimal Solution ◽  
Local Communities ◽  
Optimal Value ◽  
Interesting Task ◽  
Local Community Detection ◽  
Networks Analysis ◽  
Node Problem

Complex networks analysis (CNA) has attracted so much attention in the last few years. An interesting task in CNA complex network analysis is community detection. In this paper, we focus on Local Community Detection, which is the problem of detecting the community of a given node of interest in the whole network. Moreover, we study the problem of finding local communities of high density, known as α-quasi-cliques in graph theory (for high values of α in the interval ]0,1[). Unfortunately, the higher α is, the smaller the communities become. This led to the maximal α-quasi-clique community of a given node problem, which is, the problem of finding local communities that are α-quasi-cliques of maximal size. This problem is NP-hard, then, to approach the optimal solution, some heuristics exist. When α is high (>0.5) the diameter of a maximal α-quasi-clique is at most 2. Based on this property, we propose an algorithm to calculate an upper bound to approach the optimal solution. We evaluate our method in real networks and conclude that, in most cases, the bound is very accurate. Furthermore, for a real small network, the optimal value is exactly achieved in more than 80% of cases.

scholarly journals Re-entrant ventricular tachycardia as a complication of ablation of idiopathic ventricular premature beats from the right outflow tract: a case report

2020 ◽  
Author(s):  
Nam Van Tran ◽  
Samuel Rotman ◽  
Patrice Carroz ◽  
Etienne Pruvot
Keyword(s):  
Ventricular Tachycardia ◽  
Low Voltage ◽  
Perfect Match ◽  
Right Ventricular Outflow Tract ◽  
Outflow Tract ◽  
Ventricular Premature Beats ◽  
First Case ◽  
The Right ◽  
Premature Beats ◽  
Pace Mapping

Abstract Background We report an unusual case of non-sustained ventricular tachycardia (NSVT) from the epicardial part of the right ventricular outflow tract (RVOT). Case summary A 37-year-old woman who underwent in 2006 an ablation for idiopathic ventricular premature beats (VPBs) from the RVOT presented with pre-syncopal NSVT in 2016. A cardiac workup showed no coronary disease, normal biventricular function, and no enhancement on cardiac magnetic resonance imaging. A metabolic positron emission tomography scan excluded inflammation. Biopsies revealed normal desmosomal proteins. An endocardial mapping revealed an area of low voltage potential (<0.5 mV) at the antero-septal aspect of the RVOT corresponding to the initial site of ablation from 2006. Activation mapping revealed poor prematurity and pace-mapping showed unsatisfactory morphologies in the RVOT, the left ventricle outflow tract and the right coronary cusp. An epicardial map revealed a low voltage area at the antero-septal aspect of the RVOT with fragmented potentials opposite to the endocardial scar. Pace-mapping demonstrated perfect match. An NSVT was induced and local electrocardiogram showed mid-diastolic potentials. Ablation was applied epicardially and endocardially without any complication. The patient was arrhythmia free at 4-year follow-up. Discussion Cardiac workup allowed to exclude specific conditions such as arrhythmogenic cardiomyopathy, tetralogy of Fallot, sarcoidosis, or myocarditis as a cause for NSVT from the RVOT. The epi and endocardial map showed residual scar subsequent to the first ablation which served as substrate for the re-entrant NSVT. This is the first case which describes NSVT from the epicardial RVOT as a complication from a previous endocardial ablation for idiopathic VPB.

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