A single input dual buck-boost output reconfigurable converter for distributed generation

Abstract

The diffusion of distributed electric generation sources is a growing phenomenon, encouraged by the changes in the electric energy market and the concerns about gas emission. Microgrids are composed by different types of generators, several loads and power converters necessary to interface all the microgrid components and the microgrid itself with the main AC grid. This paper presents a new flexible power converter capable of changing its topology by means of static switches so that it can provide different conversion functions using the same hardware. This proposal aims to reduce the number of components, enhancing compactness and simplicity, and resulting in lower equipment costs. The proposed converter is conceived for domestic microgrids, is connected to the AC grid and a renewable energy source (RES) and is configurable as a single-input dual-output (SIDO) converter, providing two different DC voltage levels. After showing all the possible configurations of this converter, the analysis focuses on SIDO, deriving its mathematical model and discussing a procedure to design its elements. The controllability of the SIDO is tested via numerical simulations showing good performance even during fast transient conditions.

Reconfigurable solar photovoltaic systems: A review

“…A new concept for reconfigurable single-phase converter is proposed in [ 52 ]. It is introduced as a single-input dual-output (SIDO) converter to supply DC loads that require high and low voltage levels in domestic microgrid operation (electronic equipment, electric vehicle charging, scooter charging).…”

“… Optional inductors are included if the ac filter inductance is not enough for the charging purpose The synchronous reference frame proportional-integral current control is employed for power control Hardware implementation RSC for distributed PV- Battery systems [ 50 ] No, (Utility scale solar PV power plants) Possible for peak shifting Possible for Smooth power variation Enable to connect different types of PV modules and small energy storage systems Reduced power conversion losses by removing step up transformer VSC (1ph) 1)PV to grid 2)PV to battery 3)PV-Battery to grid 4)Battery to grid 5)Grid to battery Grid side transformer is removed from distributed multilevel modular RSC Power controlled through ramp rate controlling method Additional, separate battery is used to help ramp rate controlling MATLAB -Simulink simulation RSC with DC bus [ 51 ] Yes (AC/DC, domestic microgrid) Improves the efficiency, reduces volume, and enhances the reliability. Increased dc side of the inverter efficiency (90%) than that of dc appliances connected in ac side (72–80%) Reduce 16% of current harmonics (THD) VSC (1ph) 1)PV to grid 2)PV to battery 3)PV-Battery to grid 4)Battery to grid 5)Grid to battery Same as RSC (Jha & Triar, 2019), utilize single conversion of ac power to dc and vice versa DC loads are directly connected to the DC link without connecting to AC side through AC/DC converter Hardware implementation Reconfigurable SIDO inverter [ 52 ] Yes (Domestic Microgrid) Flexible to operate different power conversion modes Solution to meet the demand of mixed power supply (AC and DC) with single converter desirable performance under both steady-state and transient conditions. Reduced no of components, maximize its utilization, reduced cost, volume and weight Single-input dual-output (SIDO) converter (DC/DC and AC/DC converter (1ph)) 1)RES DC/DC SIDO mode 2)Grid/RES double DC output mode 3)Grid double DC output mode Single input dual buck-boost converter has been modified adding 11 static switches Measures have taken to meet mixed power supply demand (AC and DC) …”

Nonlinear Robust Control for Low Voltage Direct-Current Residential Microgrids with Constant Power Loads

“…That is, α 1 is the minimum value of α 1 for the defined parametric variation ranges and similarly for the other bound of α 1 and the boundaries of α 2 . From [28], the quadratic stability of the system (22) is ensured if it is quadratically stable with θ 1 = 1, with θ 2 = 1, with θ 3 = 1 and with θ 4 = 1: Proposition 1. [28] The quadratic stability of the system (22) is equivalent to the existence of a P ∈ R 2×2 symmetric, positive definite matrix satisfying:…”

“…In this paper, the mathematical modeling, the robust control and the stability analysis for the basic PECs (buck, boost and buck-boost), even in a reconfigurable scheme dealing with CPLs and parameter variation in continuous conduction mode (CCM), are presented to gain knowledge about more complex configurations with CPLs. The reconfigurable converter presented in this paper is a kind of PEC that can change its structure while the activity is going on (on-the-fly), providing a high flexibility and increased operating range with few components; see, for example, [20][21][22].…”

Control and Modulation Techniques for a Centralized PV Generation System Grid Connected via an Interleaved Inverter

“…Another important aspect is regarding the priority consumption of the green energy production versus traditional production from fossil energy sources, which is also pursued by means of fault-tolerant converters [13]. This goal can be achieved by means of topology changeable converters [14,15], capable of reconfiguring themselves via static switches. A different solution is based on interleaved converter topologies [16,17], where the total power is distributed among two or more identical modules.…”