Single‐phase current source converter with power decoupling capability using a series‐connected active buffer

Abstract

This study proposes a new power decoupling circuit applied to the single-phase current source converter (SCSC). Differing from the existing power decoupling technologies, the proposed power decoupling circuit could be viewed as a controlled voltage source in series with the DC inductor, and work with SCSC independently. That facilitates the separate design of the modulation schemes and the control algorithms for the power decoupling circuit and SCSC, and reduces the operation restrictions imposed by requirements. The fundamental principle of the proposed converter is analysed, and the voltage reference requirement for the buffer capacitor is investigated. To guarantee high input current quality of SCSC, a control method, where the input current is treated as a virtual control input, is proposed. Finally the effectiveness of this topology is verified by the simulations and experimental results.

Analysis of DC Link Energy Storage for Single-Phase Grid-Connected PV Inverters

“…A common two stage inverter used an extra ripple circuit module, which allows using film capacitors with less energy storage capacity compared to electrolytic capacitors [16]. Other means were reported in the literature to decrease the DC link capacitor or inductor sizes [17][18][19][20][21][22][23][24][25][26][27]. These topologies include extra circuitry, such as switching and passive components in the main current path.…”

Single-Stage Isolated Electrolytic Capacitor-Less EV Onboard Charger With Power Decoupling

“…During power decoupling operation, the ripple power component in (16) is diverted from output to C 1 and C 2 , so the instantaneous power across C 1 and C 2 can be obtained by substituting (17) and (18) in (12),…”

“…Therefore, it requires additional switches to carry out power decoupling which results in increased gate driver losses and circuit complexity. Few well-known topologies for independent power decoupling are proposed in [14]- [18].…”

Active Power Decoupling for Current Source Converters: An Overview Scenario

“…On the other hand, the active power decoupling techniques for the current source converters have been sparsely discussed in the literature. For example, Sun et al proposed an interesting circuit, which used a decoupling circuit connect in series with the main converter [31]. This power decoupling method has the advantage of control flexible.…”