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This paper analyzes Henan power circuit breakers with closing resistors operation. Selecting a typical substation as the research object, switching overvoltage and surge arrester energy absorption were simulated without the closing resistor. Measured through the field test verified the accuracy of the simulation. The relations between line length and over-voltage level was also analyzed. The result...
There is a strong trend in the photovoltaic (PV) inverter technology to use transformerless topologies in order to acquire higher efficiencies. This paper presents a single-phase five-level grid connected PV inverter with a novel dual reference modulation technique. Two reference signals identical to each other with an offset equivalent to the amplitude of the rectified inverted sine carrier signal...
Economical and ecological motives are pushing shoreside power supply by power electronics systems for merchant ships as well as for cruise ships. Also, final tests of on-ship power systems and generation are simplified considerably. Fault scenarios on-ship and within the harbour grid and the variability of the parameters of on-ship distribution - each ship is special, and large consumers or generators...
SCADA is an acronym for Supervisory Control and Data Acquisition. SCADA systems are used to monitor and control a plant or equipment in industries such as telecommunications, water and waste control, energy. A typical SCADA system comprises of I/O signal hardware, Controllers, software, network & communication. Supervisory control and data acquisition system is a system in which message or commands...
This paper proposes a new extended boost quasi Z-source inverter (ZSI) and a simple modulation and control method based on one-cycle control for controlling a grid connected PEM fuel cell energy system. ZSIs are gaining popularity. Similarly one-cycle controllers are becoming popular due to their simplicity, ease of implementation and fast response. However, this control method has not been developed...
Direct-drive wind power system needs a full-scale power converter to transmit the variable frequency electrical power to the grid. In order to improve the low voltage ride through (LVRT) capability, the grid-connected inverter (GCI) should work at a unity, a leading or a lagging power factor. Traditional control methods are complicated and output waveform is distorted by dead time. This paper introduces...
For inverter-based photovoltaic(PV) systems in grid-connected applications as distributed generators(DG), variable sources often cause wide changes in the inverter input voltage above and below the output voltage, thus demanding a buck-boost operation of inverters. Many traditional full-bridge buck inverters, two-stage inverters, single-stage buck-boost inverters either have complex structure or have...
Double modes inverters, as the interface devices between the microgrid system and public grid, plays an important role in the distributed generation system. In order to realize the connection and disconnection between double modes inverter and public grid, an intelligent switch is necessary. The switch is used to detect the status of grid and inverter, adjust the frequency, amplitude and phase of...
A household wind generation system connected with the grid are advanced in this paper, in which a diode rectifier, a boost DC/DC converter and a single-phase inverter paralleled with the grid are utilized, and a grid-connected operation mode without power injection is adopted. A double-loop control method with a current loop and a voltage loop is applied to the inverter so that the inverter feed no...
Because of energy shortage and environment pollution, the renewable energy, especially wind energy has become more and more considerable all over the world. Vertical-axis wind turbine (VAWT) has some advantages. The heavy parts such as gearbox, generator and control system can be placed on the ground and they can be maintained easily. The head of horizontal-axis wind turbines (HAWT) must be rotated...
A three-phase PWM bidirectional converter system based on line voltage oriented vector control is researched. A novel on line voltage oriented vector control without line voltage sensing is proposed. The system is operated with unit power factor in the side of AC line no matter in rectifier mode or active inverter mode. The alpha and beta components of line voltage were estimated by the line current,...
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