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A control method for small domestic power plants using renewable energy is described in this paper. This method is not only capable of optimizing the working point of the plant but also implements active power factor correction and lowers the extant harmonic distortion in the line. The novel element in the proposed complex controller structure is the upper harmonic controller that minimizes the amplitudes...
Based on the mathematical model of the current source inverter (CSI) in the stationary alphabeta frame, this paper proposes advanced stationary frame voltage control methods for CSI with linear and nonlinear loads to achieve zero steady-state error respectively. The voltage control strategy based on a special resonant controller for CSI with linear loads is firstly analyzed in detail, on the basis...
The use of distributed generators (DGs), especially renewables like wind and solar photovoltaics, depends upon inverter technology to provide compatibility between multiple DGs on a local bus. It is becoming more common to group dissimilar DGs together to form microgrids, and desirable to allow DGs to be connected or disconnected without detrimental effects upon the stability of the microgrid. This...
Power inverters are used to acquire an ac output voltage from a dc power supply. The parallel connection of inverters results in several advantages, like improvement of the system reliability and increasing of the power capacity. The control problem for parallel-connected inverters is proper voltage regulation and equal current distribution. In this paper, a characteristic loci based compensator (Approximate...
Based on the small-signal model of the half-bridge circuit, the double close loops control system of the inverter arc welding power supply was designed under the average current control mode. For the control system's voltage and current controllers, the loop gains, angular frequencies of zeros and poles were determined. The simulation model of the designed double close loops control system was established...
A novel control scheme with PD output voltage instantaneous-value feedback inner loop for voltage-source inverter is proposed. The inner loop is designed to improve dynamic performance and the IMC-PID (internal model control-proportion integral derivation) external loop can ensure stable performance. The design methods of inner loop PD controller based on pole-assignment and external loop IMC-PID...
Linear quadratic Gaussian (LQG) based phase voltage control is implemented. The regulation performance, estimation accuracy and interference sensitivity of different LQG control schemes is evaluated and compared. Paper reveals that it is possible to make the control system more insensitive to EMI when compared to dual-loop PI control and that the synchronous co-ordinate control scheme's all-around...
The interconnection of MW scale micro-turbine as a set of small, modular generation system at the LV distribution level have a significant impact on micro-grid performance. According to the dynamic characteristics of the Micro-turbine system, a complete mathematic model which considers the Micro-turbine and other electrical components as a whole is established in PACAD/EMTDC. The proposal model is...
An asynchronous distributed generation (DG) single-phase system is proposed. It is based on an asymmetrical cascaded multilevel inverter with 19 levels and it is supplied by asynchronous voltage sources. It is possible to operate continuously the proposed GD system during the grid-connected or the stand-alone modes. Details about its operation modes are presented. A prototype of the proposed GD system...
Proportional-integration (PI) controller scheme is implemented to control the phase voltage of the customer-end single-phase inverter in a low-voltage DC (LVDC) distribution system. In the inverter output, the LC-filter is used. In order to avoid resonances caused by the filter, the feedback and the feedforward filteration is used. It is shown that basic PI control system cannot drive the steady-state...
This paper is about a study on inverter control of a voltage source converter based high voltage direct current (VSC-HVDC) transmission system. An inverter model has been developed for the purpose of system control and stability analysis. The VSC-HVDC system is the exclusive power supply to a passive load in this study, and the control objective is to obtain a constant sinusoidal output voltage under...
Recently, a small-scale power system has been able to perform autonomous or islanding operation with some distributed generators. But in such a microgrid, it is afraid that serious voltage imbalance may be caused by unbalanced loads during the islanding operation. Fortunately, grid interactive inverters of the distributed generators often have some amount of surplus capacity. This paper deals with...
This paper presents an efficient method to supply single-phase loads with a three-phase induction generator (IG). A combination between a properly controlled voltage source inverter (VSI) and dump load (DL) ensures, besides the phase balancing of the IG, the voltage and frequency regulation. The VSI operates at constant frequency - thus keeping the system frequency also constant - and deals with unbalances...
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