Comprehensive review on control strategies of parallel‐interfaced voltage source inverters for distributed power generation system

Abstract

The distributed power generation system (DPGS) with renewable energy sources is gaining popularity over conventional sources of energy. Although the renewable sources of energy are available in abundance and are eco-friendly, yet, they have intermittent nature. As a result, renewable energy-based DPGS face difficulty in power transfer during adverse atmospheric conditions. Also, if the interfacing unit is a single inverter, its switches have to withstand a large amount of heat and handle a high value of current. Henceforth, to ensure uninterrupted supply and reduce voltage stress on switches, the power inverters need to be connected in parallel. This study presents various current and power-sharing control strategies of parallelinterfaced voltage source inverters with a common AC bus. A detailed classification and analysis of wired and wireless (droop) controllers for parallel-connected voltage source inverters have been done. Moreover, the recent trends and improvements in traditional droop controllers are presented. Finally, a comparative analysis among the various wired and wireless controllers is done, listing their advantages and limitations.

Frequency control in hybrid distributed power systems via type‐2 fuzzy PID controller

“…The DG system contains sources like HAE, WTG, FC, DEG, MTG, BESS etc. Table 1 shows a set of nominal parameters in terms of gain (K) and time constant (T) for the said hybrid power system [30][31][32][33][34][35][36][37][38].…”

“…The thermal power system consists of a generator, turbine, governor and reheater with the following transfer functions [37]: …”

“…The thermal power system consists of a generator, turbine, governor and reheater with the following transfer functions [37]:…”

Current Source Topologies for Photovoltaic Applications: An Overview

“…Table 1 lists some of these standards [9]. Voltage and current-fed converters are part of the applied power topologies from Figure 1b [10][11][12][13][14]; among the two, the voltage ones are widely used systems because of their simple design and control. However, current source topologies provide numerous attractive features [15], such as inherent short-circuit capability, no electrolytic capacitor, step-up voltage capability, and continuous input current, which renders them as an interesting alternative not only for PV systems, but also for all DC-AC long lifetime applications.…”

Grid‐connected operation and control of single‐phase asymmetrical multilevel inverter for distributed power generation

“…With the increase in the number of voltage levels, the harmonics content in it reduces, reducing the overall total harmonic distortion (THD) [1,2]. The conventional MLI such as neutral-point clamped (NPC), flying capacitor (FC), cascaded H-bridge (CHB), Modular multilevel converter (MMC), and hybrid inverters as presented in [3,4] are capable of producing a multilevel output voltage. In order to achieve higher levels in the output voltage, higher number of components is needed in case of conventional MLIs.…”