A grid interface current control strategy for DC microgrids

Alshareef, Muhannad; Lin, Zhengyu; Li, Fulong; Wang, Fei

doi:10.30941/cestems.2021.00028

Cited by 22 publications

(5 citation statements)

References 9 publications

(13 reference statements)

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“…DC-based energy systems offer seamless integration with DC renewable generation, energy storage, and DC electronic devices. In contrast to conventional AC systems, DC systems come with benefits such as simpler control, enhanced reliability, and greater efficiency [25]. A schematic of this mode is shown in Figure 4.…”

Section: Microgrid Modementioning

confidence: 99%

A Review of Control Techniques for Inverter-Based Distributed Energy Resources Applications

Hasheminasab,

Alzayed,

Chaoui

2024

Energies

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The escalating adoption of low-carbon energy technologies underscores the imperative to transition from conventional fossil fuel-dependent sources to sustainable alternatives. The expansion of Distributed Energy Resources (DERs) signifies an essential shift towards a more resilient and environmentally friendly energy landscape. However, integrating inverter-based DERs introduces challenges, particularly in system inertia and grid instability. This review delves into the critical area of inverter-based grid control strategies, focusing on the primary and secondary control mechanisms. Primary controls are investigated, including traditional droop control and low-voltage ride-through (LVRT) capability. The secondary control strategies, involving virtual impedance (VI) and load frequency control (LFC), are vital in maintaining grid stability and reliability are reviewed. The aim is to offer a comprehensive understanding of the principles, advancements, and challenges associated with inverter-based grid controls, contributing valuable insights for the seamless integration of DERs into modern power grids.

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Section: Microgrid Modementioning

confidence: 99%

A Review of Control Techniques for Inverter-Based Distributed Energy Resources Applications

Hasheminasab,

Alzayed,

Chaoui

2024

Energies

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“…The placement of the DGs ensures that they complement one another and maintain the microgrid's seamless operation. To assure improved operation of a microgrid in a grid-connected system, the control schemes within a module is created [18,19]. In order to thoroughly investigate power quality disturbances and operating issues connected to the integration of RES into a balanced distribution network, this paper makes use of a standard IEEE 13-bus power system [20].…”

Section: Introductionmentioning

confidence: 99%

Switched Z-Source Boost Converter in Hybrid Renewable Energy System for Grid-Tied Applications

Sathish C.H.

2024

jes

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The world's focus is shifting toward Renewable Energy Sources (RES) as a result of the sharp rise in energy demand and the depletion of conventional energy sources. Distributed generation (DG) units developed on RES are easily and reliably integrated into grid due to microgrid technology. Inverters are typically used to integrate DGs into microgrid. At present, the fastestgrowing renewable sources of electricity in the world is photovoltaic (PV) and wind energy conversion system (WECS), which evolved in response to growing environmental concerns about the risks of climate change connected with power generation. Recent technological developments have made it a top priority for researchers to find ways to enhance the efficiency of hybrid systems and the power converter stage. In order to achieve transmission losses and ensure energy savings, a new 13-bus system is developed in this work for regulating the output voltage in distribution networks. Switched Z-source Boost converter along with Proportional Integral (PI) controller is employed to boost the voltage obtained from PV system. A battery converter along with a bi-directional battery is connected to the DC link, to store energy generated by Hybrid Renewable Energy System (HRES) in excess amount. The obtained DC link voltage is transferred to three-phase voltage source inverter (VSI) for the conversion of DC to AC voltage. Effective harmonic reduction is attained with the aid of LC filter coupled to Three phase grid, and the PI controller associated to the grid supports in achieving effective grid synchronization. The proposed research is validated using MATLAB Simulink by considering the 13-bus system and an efficiency of 96.8 % is obtained with 0.93% Total Harmonic Distortion (THD).

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“…Maintaining the DC MG voltage at the designated level during loads fluctuation demands with unknown and fluctuation loads is the challenge the control of DC MG today [13], [14]. In DC MG, the fluctuations of the load demands have big influences on the system stability [15], [16].…”

Section: Introductionmentioning

confidence: 99%

“…Several studies investigate and discuss the droop-control technique in the DC MG. In this technique the fluctuation of the load demands is compensate by increasing voltage output of DC-DC converters [15], [17]. However, by increasing load capacity in the MG, the current flowing to the load is also increased, and thus the loss power during distribution lines is increased respectively.…”

Section: Introductionmentioning

confidence: 99%

PID Controller for DC-DC Converter under Dynamic Load Change in Photovoltaics based Low-Voltage DC Microgrid

Setiawan

Hidayat²,

Sari³

2023

KINETIK

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Today, DC Microgrid gain more attraction due to increasing electronic digital devices application such smart-phones, smart-tvs, and other digital apparatus which are operated in DC form. In the common grid, the electric power from AC source is converted to DC voltage for powering the digital devices as load. Hence, there are power conversions from AC-DC and potentially loss energy during conversions. DC Microgrid consisted of sources, loads, distribution lines and energy storages. In small capacity DC Microgrid, the stability of the system is vulnerable by dynamic load change. During load demands fluctuations, the DC Microgrid voltage is also dynamically fluctuated and can reach over the designated rate. To solve this problem, the PID controller is introduced in the DC-DC converter for maintaining the voltage rate at designated value regardless the load demands. In this paper, the DC Microgrid is consisted of photovoltaics as DC sources, XL-6019 as DC-DC converter, Arduino as controller, voltage and current sensors, distribution lines and loads. The proposed method is evaluated via experimental results. The responses of the proposed method in the DC Microgrid system are presented, evaluated, discussed, and compared between with and without applied method. The experimental results indicate that the proposed method has ability to reduce the voltage profile fluctuations during load demands changes and in short time.

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A grid interface current control strategy for DC microgrids

Cited by 22 publications

References 9 publications

A Review of Control Techniques for Inverter-Based Distributed Energy Resources Applications

A Review of Control Techniques for Inverter-Based Distributed Energy Resources Applications

Switched Z-Source Boost Converter in Hybrid Renewable Energy System for Grid-Tied Applications

PID Controller for DC-DC Converter under Dynamic Load Change in Photovoltaics based Low-Voltage DC Microgrid

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