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This paper proposes an advanced model predictive control for the three-level active-neutral-point-clamp (ANPC) inverter in order to improve the system performance with fast dynamic response and ensure the stability of the controller. The proposed scheme is Lyapunov function based voltage mode control which utilizes the discrete behavior of the converter considering the unavoidable quantization errors...
Inverters in voltage control mode including droop control and virtual synchronous generator (VSG) are promising for interconnecting the renewable energy to the grid, which are both emulating the frequency and voltage regulating functions of synchronous generators through droop method. However, improper transient impact current and reactive power output are observed for inverters in voltage control...
It's known that single-phase power factor correction (PFC) converter has second-order harmonic currents (SHC), which results in voltage ripple on DC load. The active storage unit (ASU) is employed to absorb SHC with ASU's input current (iasu) following SHC. In order to accurately extract ASU's current reference (iasu*) in a simple way, a real-time calculation method is proposed. At the same time,...
Distributed static series compensator (DSSC) is a new type of distributed FACTS devices that can realize accurate control of power flow and enhance voltage stability. Thus, it could be installed in stability-limited transmission systems widely. This paper presents a new capacity control model for DSSCs and deduces the corresponding power flow equations. To illustrate the effect on system power voltage...
In this paper, Lyapunov law based model predictive control scheme is proposed for the grid integration of 3L-neutral point clamped (NPC) inverter. Lyapunov law based cost function, which aims to select the optimal voltage vector using system discrete model equations just once in each control cycle is able to reduce the current tracking error. Thus, low THD symmetrical current is injected to the utility...
This paper introduces a digital PWM control of the KY step-up converter based on sigma-delta modulator, in which the mathematical modeling of the KY step-up converter and sigma-delta modulator are deduced. Then the digital control of KY converter with sigma-delta modulator, integrator and dumper, and digital to duty cycle converter has been successfully built in MATLAB Simulink to verify the idea...
Considerable wind resources are aggregated on Taiwan west coasts that adjacent to Taiwan Strait, it promotes the domestic government to develop the off-shore wind farms for the applications of renewable energy. The first MW level wind turbine testing site that be connected to the 11.4 kV distribution system is also under construction in Taiwan, which is expected to provide testing and certification...
In this study, the feedback controllers were designed and implemented to fulfill the constant-voltage (CV) and constant-current (CC) output modes for a power converter. This converter's power stage was composed of a stand-by power, power factor corrector, and DC-DC converter. The topology used by the DC-DC converter was a phase-shifted full-bridge with a parallel current-doubler rectification converter...
Energy conservation is a big concern issue. Especially, various traditional lighting devices are being replaced by LED lights that offer advantages including low pollution, low energy consumption, and long life. This paper presents a design for street lighting that includes a high-power LED series as a light source. An LED driver was built up by combining a buck-boost converter and a forward-flyback...
This paper describes a design for fast and robust nonlinear deadbeat control for boost DC-DC converters. Nonlinear current reference deadbeat control is derived based on nonlinear state equation of the converter. Load disturbance compensation is implemented thus forming a new robust nonlinear controller. Both experiments and simulations of boost converter with input 12 V, output 20 V, load 4 Ω and...
The VIENNA rectifiers have advantages of high efficiency as well as low output harmonics and are widely utilized in power conversion system when dc power sources are needed for supplying dc loads. VIENNA rectifiers based on three-phase/level can provide two voltage outputs with a neutral line at relatively low costs. However, total harmonic distortion (THD) of input current deteriorates seriously...
A decoupled active-reactive power control technique is proposed for an oscillating water column (OWC) based wave energy conversion system adopting grid connected doubly fed induction generator (DFIG). The effectiveness of the technique is investigated under various rotor speed and reactive power reference commands. The results show enhanced performance, better tracking, and improved transient response.
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