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Open-end winding induction motor can be powered by double inverters at both ends. Comparing with conventional single-ended inverter induction motor drive, this new configuration produces some advantages, such as high error tolerance capability, high flexibility, and low DC voltage rating, and so on. Under single DC power supply however, the zero-sequence currents may be produced by the common mode...
A control strategy for bidirectional flow of electromagnetic stirring is proposed. The topology structure of the system includes the forward stage PWM converter and the backward stage two-phase three-leg converter, which both can work in the rectifying and inverting status. So bidirectional energy flow can be realized. The control method for the forward stage is the double loop control with ripple...
This paper presents a new power supply consisting of an inverter and a power factor correcting stage with an integrated active energy storage for servo drives. The energy storage is realized with a capacitor and a DC-DC-converter. This enables the power supply to reuse the braking energy of servo drives instead of losing it in a braking chopper resistor. The main advantage is the simple integration...
The authors solve the problem of effective use of renewable energy sources for autonomous electric consumers. A new device for coupling heterogeneous energy sources has been developed. The universal coupling device (UCD) allows to connect diverse AC and DC sources to a 220/380VAC consumer. A 30 kVA UCD prototype is created. The article gives a UCD brief description and presents the results of the...
The technology of microgrid has been developed by the progress of new energy technology, the new energy connected to the microgrid by (distributed generator) DG. Microgrid represents the new direction of the power grid as the great complements of traditional power supply network. This paper presents that using several photovoltaic grid-connected inverters as the DG, and control the microgrid by controlling...
This paper considers scheme of primary AC power supply system for autonomous objects. As well this paper presents the characteristic features of power supply system, its structural model and the simulation results are given.
This paper focus on energy efficiency comparison and analysis of different DC power distribution mode for large data center. First, several single-module DC power supply systems with different voltage level and power capacity are applied to substitute for UPS based AC distribution mode for a typical data center of high-tech park with many enterprises. Secondly, system efficiency, power supply loss...
This paper concerns AC feeding system and the power supply in the dead section for auxiliary equipment. We developed the uninterruptible method using regenerative power of traction circuits through main transformer. To verify the proposed method, we executed the running tests using high power electrical locomotive. We show these outlines.
Equal rating inverters operating with different power set points may experience circulating power during unpredictable cases such as faults on a heavy load site due to a large mismatch between load consumption and power generation. This momentarily circulating power increases the dc-link voltage of the inverter and exceeds the voltage limit, leading to inverter shutdown for safety purposes. To overcome...
The paper attracts on the substantial introduction of the smart solar powered battery backup system in the rural segments due to sizeable gap between demand and supply. The smart power distribution is estimated on the optimal outlay of the hybrid grid adopting as a smart technology and cost effective solutions of the power crisis for the emergency perusal and smart banking. To extend the gross domestic...
Sampling points in one cycle of 400 Hz inverter are 8 times less than that of 50 Hz inverter, resulting in lower control accuracy and larger static error in 400 Hz power supply system. This paper set up a mathematical model for single-phase solid-static power supply system. The transformer leakage inductance and load can be regarded as uncertainties. A robust controller based on the principle of mixed...
As aviation power supply is developing to be increasingly integrated, by sharing the same main circuit, AC and DC dual output can be achieved through the same power supply to greatly improve power integration and power density. However, transformation ratio and transformer leakage in AC conversion can cause voltage drop in DC output and thus fail to meet the rated voltage of aviation DC power. To...
The article describes the structural organization of the three-phase converter quickly reconfigurable networks constructed on the basis of autonomous voltage inverter with amplitude-width modulation. A multi-organization of power supplies at high and adjustable frequencies allows to operatively change operating modes of modules, adapting the network topology of the converter to the changing parameters...
The application of inverter power supply is introduced and defects and shortcomings of traditional inverter control method. The advantages and disadvantages of the control method are analyzed through the study of the double closed-loop control method and the repetitive control method, according to the characteristics of the control method, a compound control method is proposed, the simulation model...
When power frequency alternating voltage was used to heat soybean milk, electrode surface was corroded. Aiming at this problem, a high frequency and high power supply based on ARM microprocessor was designed. This power supply consists of ARM microprocessor, human-computer interaction interface, direct current power module, inverter device and data acquisition device. And it could change direct voltage...
This paper presents distractive features of hysteresis voltage control for voltage source inverters. The features of the creation of the hysteresis voltage control systems for electric power systems are considered. The possibility of applying of hysteresis voltage control for multilevel voltage source inverters is evaluated. A simulation of a three-level three-phase voltage source inverter with hysteresis...
The acceleration grid power supply (AGPS) is an important part of the neutral beam injector (NBI) system. With the increase in NBI power, the requirement for output voltage of the AGPS is becoming higher and higher, even reaching to 1000 kV. As the inverter-type high voltage power supply uses inverters located at the lower voltage side to regulate and cut off the output voltage, it is very suitable...
Grid-connected photovoltaic power generation and independent photovoltaic power generation which are suitable for different occasions are all important application field in photovoltaic system technology. If the two modes are connected effectively, the application range of the photovoltaic inverter can be expanded to move forward a single step, at the same time the structure of photovoltaic power...
Distributed generation is violent fluctuations because it depends on output of the clean energy generation system. Thus a power leveling system (PLS) is applied to maintain a balance between power supply and such an irregular power generation. The PLS is required to operate charge or discharge of storage and bidirectional power flow. Thus the PLS consists of a bidirectional buck/boost DC/DC converter...
Electrical power supplies or networks containing voltage harmonics cause harmful effects to the electrical equipments and thus economic losses to their users. Series active filters are an alternative to reduce or even eliminate these voltage distortions. They produce opposing voltages to the harmonic voltages from the power supply and therefore loads are fed with an almost sine wave signal. This paper...
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