Related Experiment Video
Updated: Jul 10, 2025
06:04
Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
Published on: February 14, 2025
404
Improving efficiency of parallel inverters operation in island mode microgrids
Mohamed Zaki1, Ahmed Shahin2, Saad Eskender2
1Electrical Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt. Mohamed_zaki@mans.edu.eg.
Scientific Reports
|November 25, 2023
Summary
This study introduces an analytical optimization technique for paralleled DC/AC inverters in microgrids. The method enhances system efficiency and minimizes circulating currents, outperforming other optimization techniques.
Area of Science:
- Electrical Engineering
- Power Systems
Background:
- Microgrids rely on DC/AC inverters for renewable energy conversion.
- Parallel inverter operation faces challenges in efficiency, circulating currents, and accuracy.
Purpose of the Study:
- To develop an analytical optimization technique for enhancing efficiency and minimizing circulating currents in paralleled inverters.
- To improve the accuracy and streamline construction of microgrid systems.
Main Methods:
- Utilized a rapid recursive least squares (RLS) estimator for system parameter estimation.
- Implemented an optimized proportional-integral-derivative (PID) controller for high accuracy.
- Compared the proposed optimizer against Particle Swarm Optimization (PSO), neural networks, and interior point methods.
Main Results:
- The proposed optimizer demonstrated superior efficiency, stability, and reduction in circulating currents.
- Achieved zero execution time, significantly faster than neural network optimizers (0.693 s).
- Improved system efficiency by 3% compared to equally shared current systems.
Conclusions:
- The analytical optimization technique is effective for paralleled inverters in microgrids.
- The method offers significant advantages in efficiency, speed, and current management over existing approaches.
More Related Videos
Related Concept Videos
01:24Fast Decoupled and DC Powerflow
204
The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
204
01:18Reducing Line Loss
155
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss...
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss...
155
01:24Bridge rectifier
636
The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...
Operationally, the bridge rectifier allows current flow through two of its diodes during each...
636
01:17Series and Parallel Inductors
496
In electrical circuits, integrating inductors into the toolkit of passive elements requires navigating the intricacies of series and parallel combinations involving these components. Practical circuits often feature configurations of multiple inductors, and understanding how to determine their equivalent inductance is vital.
For a series connection of N inductors, each carrying the same current, applying Kirchhoff's voltage law unveils a crucial relationship. Substituting the expression for...
For a series connection of N inductors, each carrying the same current, applying Kirchhoff's voltage law unveils a crucial relationship. Substituting the expression for...
496
01:24Bus Impedance Matrix
122
Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
122
01:25Multimachine Stability
163
Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
163