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The paper presents a PWM control system of a sinusoidal voltage as output of a single-phase inverter with resistive load and LC low-pass filter. First the PWM control for a sinusoidal voltage and the control loop optimization via modulus criterion for step input signal are discussed, further analyzing the stationary error for a sinusoidal signal. This error can be reduced to zero by introducing a...
In this paper we propose the structure and the functioning of a photovoltaic (PV) connected to the electric distribution and transmission network, equipped with the malfunction detection blocks. The studies that were carried focused on the injection of a power of 16 KW, produced by a PV panel field, on the electrical network of medium voltage (25 KV). In order to the reliability of the injection system...
In an AC-DC-AC motor drive system, a beat phenomenon of the motor current occurs, especially in the over-modulation range with DC-link voltage ripple and low frequency carrier. We analyze this beat phenomenon and propose two beatless control methods. One modifies the carrier frequency in accordance with the motor speed within a narrow range, and as a result, the beat frequency can be shifted to a...
The flying-capacitor multilevel inverter is a recently developed topology to ensure a flexible control and a modular design. However, this inverter requires a balanced DC voltage distribution. This can be realized by using a special control leading to natural balancing or by measuring voltages and selecting appropriate switching states. To solve the capacitor voltage-balancing problem a validated...
Home automation and smart grid development is motivated by many advantageous situations that include the demands on renewable energy and the advantages provided by power line communications technology (PLC). The integration of solar energy into conventional grid implies the control of different modules included in the system. Remote control seems to be the control mode by excellence, in which communication...
Ever increasing energy consumption and pollution caused by burning of fossil fuels to meet our energy requirements have led researchers to focus on alternate forms of energy which are clean. Solar, wind and fuel cells are the areas in which research is going on with fast pace. Solar and wind have their drawbacks since electricity is generated only when sun shines or wind blows while fuel cells can...
Modulation theory is a powerful tool for power converter analysis. However, present modulation theory only provides limited equations and lack of flexibility for inverters under different control modes. Thus an extended modulation theory is proposed in the paper. The paper takes a three-phase six-pulse inverter as an example, and discusses in detail all the states of inverters under phase control...
This paper proposes a new voltage control technique for IPMSM drives to extend DC-link voltage utilization for flux weakening operation. The presented method does not require look-up-table and motor parameter for flux weakening operation. The difference between the switching period and summation of active switching times for PWM control of inverter is used to modify the d-axis current reference under...
This paper presents a direct current controlled pwm method for control of four-switch, three phase BLDC motor. The main features of this converter are twofold: the first is the reduction of switches and freewheeling diode count, the second is the reduction of conduction losses. For effective utilization of the developed system, a novel direct current controlled pwm scheme is designed and implemented...
Utilizing User-Defined (UD) modeling function of Electromagnetic Transient Simulator for DC and AC Power System (ETSDAC) in Advanced Digital Power System Simulator (ADPSS), this paper establishes an STATic synchronous COMpensator (STATCOM) model based on three-level inverter, whose function is the same as the STATCOM model in Electro-Magnetic Transients Program (EMTP). Neutral-point balancing algorithm...
Open-end winding variable speed drives with dual-inverter supply have been extensively investigated for various applications, including series hybrid powertrains and propulsion motors. The existing body of work is restricted to the three-phase electric machinery. This paper looks at the possibility of using machines with higher phase numbers in an open-end winding configuration with dual multiphase...
Three-level voltage space vector can be synthesized using a dual two-level inverter scheme employing open-end winding induction motor drive. Owing to the advantages this configuration offers over the other popular three-level inverter configurations, many PWM control strategies have been proposed. Towards this end, alternate sub-hexagonal center PWM switching scheme was presented recently that employs...
Multilevel inverters have been used widely because of their high power capability, lower output harmonics and lower commutation losses and so on. Their main disadvantage is their complexity, requiring a great number of power devices and complex control method. In this paper, a new topology is proposed based on H-bridge cascaded inverter. The new topology produces a significant reduction in the number...
Recently, the problem of global warming and environmental deterioration, depletion of fossil fuel are remarkable, and the method of power generation and energy conversion with efficient using the natural energy is proposed. This technology will be quickly commercialized in future and the popularization is widely expected for the reduction of CO2. In this paper, new single phase inverter circuit which...
Reactive power compensation of a Static Synchronous Compensator (STATCOM) employing three-level inverter based on diode-clamped was realized using alternation working switch order based pulse width modulation (PWM). The design of alternation working switch order based PWM and its realization based on DSP was described. A scale model simulation of the proposed STATCOM was accomplished to study the...
This paper presents a high-voltage high-frequency inverter for atmosphere plasma applications. The proposed system is consisted of a PFC rectifier, a voltage-source full-bridge inverter with phase-shift control, a high-voltage high-frequency transformer, and a plasma reactor. The mathematical models including the inverter and the plasma reactor have been described. The PFC rectifier is achieved by...
The circuit of DSTATCOM is analyzed. The dynamic model of DSTATCOM based on three-level voltage inverter is established by way of lead-in switch function. Control method of DSTATCOM is focal point of this research. The dissertation determines the detection means based on instantaneous reactive power. PWM control by tracking the current technology achieve to direct control. The simulating results prove...
The brushless DC motor (BLDC) has been widely used in industrial applications because of its low inertia, fast response, high power density, high reliability, and maintenance-free reputation. They are usually supplied by a hard switching PWM inverter, with rather high switching loss. Therefore large heat-sinks are required for dissipation of this switching loss which increase the volume and weight...
Multilevel neutral point clamped inverter systems are increasingly used in load compensation applications. But, the most significant problem associated with these compensators is the capacitor voltage imbalances and drift due to DC components in the zero sequence current, resulting in degradation of tracking performance of the voltage source inverter. This paper proposes a carrier based PWM control...
In this paper, four PWM control methods: simple boost, maximum boost, maximum constant boost, and modified space vector PWM control are reviewed and compared for different voltage type Impedance Source Inverter (ZSI) topologies. There are three different topologies for three phase-two level-voltage type ZSI: basic, bidirectional, and high performance ZSI. For purposes of comparison, these three ZSI...
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