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The voltage fluctuation of power grid is commonly known as interference electricity and is the great threat against continuous production of some enterprises. Comparing to the motor uninterruptible power supply (MUPS) system, the common scheme of UPS for anti-interference electricity has many defects. The structures, principles, characteristics and advantages of MUPS are briefly introduced in the...
In order to improve the current tracking performance of shunt active power filter and reduce the switching frequency, in this paper, two kinds of space vector control strategies are studied. The double hysteresis current control method based on voltage space vector (DHCC-SVM) is introduced specifically. This method chooses the optimal output voltage vector through judging the space distribution of...
It is analyzed detailed the mechanism of common mode current for the transformer-less photovoltaic inverter system. Different control methods are used to analyze the common mode current of single-phase transformer-less full-bridge topology, and some new topologies are also analyzed and simulated. Finally, a new high-efficiency transformer-less photovoltaic generation system which is based on single-phase...
The technology of the shaft furnace section in the pellet production has its special technical characteristics, this paper presents an intelligent control system for integrated optimization of production targets in the shaft furnace section. Then we proposed the hardware configuration, network configuration and control functions of the shaft furnace roasting process based on the Siemens Profibus-DP...
This paper describes the work of designing a fully-digital shunt active power filter control system based on digital signal processor TMS320F2812. The control algorithm for control system of shunt active power filter is realized by DSP which is the core processor of the embedded operating system μC/OS-II's hardware platform, the ip-iq principle is presented for the harmonic current extracting and...
The configuration and principle of shunt active power filter is introduced briefly in this paper. A digitally controlled shunt active power filter based on double DSP is designed for the three-phase four-wire system. The main circuit of the shunt active power filter selects a four-leg voltage-source inverter, and a dynamic hysteresis-band current control is used to track the current. A control strategy...
In this paper, a fuzzy control method is introduced for Buck converter and a Proportional-Differential (PD) like fuzzy controller is designed. The nonlinear characteristics of the PD like fuzzy controller in small-signal range are analyzed. The analysis shows that the PD like fuzzy controller is equivalent to a modified PD controller which provides an additional correction action. The PD like fuzzy...
The power system is seriously polluted because more and more electronic devices are used and lots of harmonics are injected into it. A novel strategy on which system does not produce any harmonics is brought about. It is named as switch-linearity hybrid technology (SLH). In this technology modulated PWM source, LC filter and linear power amplifier based on different topologies such as B or AB sorts...
In this paper, a novel continuous reactive power compensator based on soft switching was discussed. Directed at the traditional electric power parameters measuring system didnpsilat have the managing ability of the modern operation system, a technology of AC synchronization sampling was given which was based on embedded microprocessor S3C44B0X with 32-bit ARM7TDMI core and muC/OS-square real-time...
In this paper, a new kind of high-voltage continuous reactive power compensator which was based on soft switching was introduced and a DSP+CPLD-based controller was designed. The hardware design and software flow chart was described in detail. The DSP and CPLD are used to design a controller , making its construction compact .thus improving its reliability and real-time characteristic.
An automatic control system for on-line rail heat treating unit, which suits Chinese production situation, is introduced. The system adopted continuous rail entering way. The coolants are "water-air mixture" or "wind". The cooling process was controlled in segments. Roller bed velocity and fan were controlled with variable voltage variable frequency device. Heat treating time,...
A novel reactive power continuous compensation and harmonic suppression on power supply is proposed. The paper introduces its essential principles and presents realizable scheme of key technology. Finally, feasibility of this technology is analyzed by simulation and verified by experiment
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