Controller design and stability analysis of grid connected DC microgrid (original) (raw)

A Review: DC Microgrid Control and Energy Management System

Continuously increasing demand of microgrid with high penetration of distributed energy generators, specially focused on renewable energy sources is modifying the traditional structure of the electric distribution grid. In addition, DC microgrids diverted the attention of researchers and power electronics industry in recent years to stimulate renewable energy technologies (RETs) and distributed energy resources (DERs) deployment and encouraging technological innovation to reduce green house gas (GHG) emission and achieve energy security and independence to meet the growing electricity demand. So for many studies have been done on successful integration of RETs and DERs, operation and control, protection and stability issues, simultaneously and satisfactorily implemented during feasible operation of microgrid. Studies show that DC transmittable power can increase the system efficiency up to 10% as compared to AC. But still DC bus voltage fluctuation, power quality and flow during the...

Control Strategies in Dc Microgrid Environment

Microgrids are changing the traditional approach of addressing energy demands in a variety of communities and businesses. They open up new paths to a carbon-free, dependable, and resilient electric system. DC Microgrids are becoming more prevalent as power electronic converter technology advances. Today and in the future, higher fuel prices, deregulation, and environmental constraints present more opportunities for the use of renewable energy sources (RES) in power systems. A micro grid idea is necessary to integrate renewable energy sources into the electrical system. As a result, this proposed system has a micro grid control mechanism involving solar (PV), battery energy storage systems (BESS)and wind. To begin, voltage control alternatives for an island micro grid are investigated using hierarchical control approaches. Furthermore, the cost and electricity generated by renewable sources are calculated. Finally, this study presents an energy management system for micro grid functioning. In grid-connected mode, MATLAB and Arduino programming are used to find the lowest cost of electricity generation and power availability. The simulation results indicate that the suggested solutions are close to being accurate and efficient. The corresponding hardware model has been implemented.

Power Control of DC Microgrid With Variable Generation and Energy Storage

Power control strategies of DC Microgrid with variable generation and energy storage was presented in this paper. The DC microgrid consists of PV panel ,wind turbine, battery, dc loads and a grid–connected inverter system. In order to ensure the stability of a DC microgrid, the power flow within the DC microgrid must be balanced at all times to maintain a constant dc bus voltage. Different with the centrally control method , the droop control based on the dc-bus signalling(DBS) technique is used in this paper. When the load power variation or ac grid fault, the bi-directional grid converter or battery need to adjust the power balance during grid-connect condition or island condition. MATLAB/SIMULINK simulations are presented to demonstrate the feasibility of the proposed power control strategy during various operating conditions.

Analysis of Performance and Control of DC Microgrids as Electricity Providers for Renewable Energy

E3S Web of Conferences

The increase in demand for electrical energy is increasing rapidly, in line with economic growth. In developing the electricity system, electrical energy service providers must provide electrical energy according to demand with good quality. The generation of conventional electric energy systems that use fossil fuels faces depleting fossil fuel sources, poor efficiency, and environmental pollution. This technology is known as Distributed Generation (DG). Distributed Generation (DG) or Micro Grid (MG) is a small-scale power plant located close to the load. The use of distributed generators can improve the entire system's efficiency, reduce transmission losses, reduce pollution, and ensure the continuity of the distribution of electrical energy. However, the drastic increase in the use of DG causes problems in the form of voltage and frequency stability which will be disturbed due to rapid changes in the generation and loading rates. If this is left unchecked, it can harm system s...

Power Management in DC Microgrid by the DC-DC Converters

International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2023

DC loads have proliferated rapidly on the market today and DC micro grids with renewable energies are being built as a potential solution to meet the rising demand for electricity. As different energy sources such as solar, wind, fuel cell, and diesel generators can be incorporated into the DC grid, it is important to control the power flow between the sources. An attempt is made in this paper to study the hybrid system consisting a three energy sources, namely wind energy, photovoltaic power source and Battery. Each of the three energy sources is controlled so as to deliver uninterrupted power supply to the load. A control strategy for the management of power flows with solar and wind energy sources in DC micro grid are discussed. Given that voltage profile regulation is critical in a standalone system, a dedicated converter should be used to maintain the voltage of the DC connection. The battery circuit regulates DC charging voltage, while the full power is derived from Solar and Wind to power the attached DC bus charges. An algorithm is developed to manage power flow between three outlets. The algorithm is evaluated in MATLAB / SIMULINK environments for different charging conditions and variations in solar and wind energy.