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This paper proposes new modulated carrier control (MCC) method for power factor correction (PFC) rectifier which provides high power factor (PF) and low total harmonic distortion (THD) regardless of continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The proposed control method employs a modified MCC control circuit based on the conventional MCC using average current sensing...
Traditional Hysteresis current control (T-HCC) method has a good transient response performance and robustness. However, when applied in the three-phase voltage source converters (VSCs) occasions, due to the interphases dependency and coupling among the three-phase currents, current harmonics and high switching frequency will arise. Considering of this, this paper presents a new sine-like HCC (SL-HCC)...
There has recently been a significant interest directed towards residential battery storage systems mainly motivated by high penetration of renewables, the low cost and high efficiency of power electronic devices, and the advancements in the safety and energy density of the batteries, especially Lithium-Ion (Li-Ion) batteries. Furthermore, the possibility for the end user to become a utility-independent...
This paper proposes modulation and control strategy for a single-phase to three-phase (1p-3p) indirect matrix converter (IMC) drives. The 1p-3p IMC is composed of a singlephase current source rectifier (1p-CSR) and a three-phase voltage source inverter (3p-VSI). The 3p-VSI is operated with modulation strategy similar to that of a common inverter. The 1p-CSR must be operated with a restriction where...
Voltage unbalance in a three-phase system introduces oscillations to the DC Link voltage and power. Moreover, it causes performance deterioration of a pulsewidth modulation (PWM) of the back-to back voltage source converter systems (BTB-VSC) by producing the double-line-frequency ripples in the dc link voltage and power. This paper proposes a new control strategy by developing the conventional vector...
Conventional state estimation methods are unsuitable for power systems with FACTS devices. A new approach to state estimation of power systems with unified interphase power controllers (UIPC) is proposed. The required extension of the conventional model of the system necessitates use of constraints on the limits of operation and ratings of the UIPC. Results of tests of the IEEE 14 bus system using...
A hardware test-bed (HTB) has been developed to realize power system emulation by mimicking the system components with universal three-phase voltage source converters (VSCs). The VSC-based transmission line emulator has also been successfully developed to flexibly represent interconnected ac lines under normal operating conditions. As the most serious short-circuit fault condition, the three-phase...
This paper proposes a new control method for two stage converters to realize the virtual synchronous generator (VSG) operation, which also can help eliminate circulating power between energy storage (ES) converters. It is proven in this paper that the proposed method shares stronger resemblances with synchronous generators (SGs) than traditional VSG in aspects of power conversion process and mathematical...
LCL filters are commonly used to connect Voltage Sourced Converters (VSCs) to the grid. This type of filters are cheaper than a single inductor, but they can generate resonance problems if no active or passive damping method is used. Active damping methods are becoming popular in the literature because they improve efficiency, but they are sometimes difficult to implement and additional measurements...
Frequency domain passivity theory is used to evaluate harmonic resonance instabilities in a system with multiple grid-tied voltage source converters (VSCs), and subsequently, a stabilizing controller using predictive current control (PCC) method is proposed to prevent such instabilities. The input admittance of VSCs using PCC can achieve passivity almost up to the Nyquist frequency. This research...
This paper proposes an electromagnetic transient model of the Convertible Static Transmission Controller (CSTC) system in shunt-shunt operation mode. This proposed transient model is used for dynamic analysis and system design. Two recently proposed control structures, which aim to suppress the DC link voltage oscillations under unbalanced AC grid, are applied and compared to the conventional state...
VSCs connected to the grid through LCL filters are common in the integration of renewable energies into electrical systems. Therefore, in this paper small signal stability of the current loop of this configuration is performed. The analysis includes the getting of a state-space representation of the system, the calculation of their eigenvalues and the sensitivity analysis to the variation of some...
This paper presents results of the control of a magnetic gear integrated permanent magnet synchronous generator (MG-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). The generator has two rotors and one stator. By magnetic gearing, the low speed of the outer rotor is amplified to the high speed of the inner rotor, which faces...
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