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In order to enhance the reservoir permeability and conductivity of oil reservoir and to improve the production of oil and gas by using the high-energy arc fracturing device, a high frequency high voltage sparker with a stored energy of 40kJ was developed. The sparker is mainly composed of a high voltage high frequency charging supply, energy storage capacitors, a discharging electrodes and a safety...
The LC hybrid active power filter (LC-HAPF) is able to compensate reactive power and harmonics with operating voltage lower than the grid voltage. The quasi proportional-resonant (PR) controller could reduce the current tracking error by increasing the open loop gain at the selected frequency. Multiple PR controllers have been adopted for improving harmonic compensation in LCL filter coupled grid-connected...
As the development of control theory in power electronics, kinds of control methods are used in high-voltage power supply's design. Simulation is one of the keys to verify the control method accuracy when designing a supply system. In this paper, a phase shifted control method is utilized in parallel resonant circuit, and the condition of the power electronic switch devices during the process of phase...
Based on the demands of TEA CO2 laser, high power, high-precision and high repetitive rate charging technologies of capacitor charging power supply was discussed in the paper. Capacitor charging power supply adopted series resonant circuit has constant current and "fixed voltage steps" charging characteristics which were analyzed in the paper in theory. Because of the constant current charging...
This paper proposes an advanced non-harmonic detection control strategy for three-phase four-wire Active Power Filter (APF) based on improved Vector-Resonant Control (VRC). The mathematical model of the split-capacitor configuration is established with the source currents and the DC bus voltage as state variables. The proposed control scheme detects and regulates the source currents directly, without...
This paper presents a novel drive strategy for the drive mode of a micro-gyroscope using second-harmonic excitation, which drives the resonator with a pair of orthogonal signals at half the resonant frequency and senses the vibration signal at the full resonant frequency, thus realizing the frequency isolation between the actual mechanical response and electrical crosstalk signal. This approach is...
This paper proposes a nano-positioning system driven by a high force density voice coil motor (VCM) and supported by a complex parallel four-bar flexure mechanism. The VCM employs bilateral Halbach permanent magnet (PM) arrays and triple-segment coils to achieve high force-current ratio and low force ripple. Complex parallel four-bar flexure mechanism is designed to obtain high stiffness and good...
The photovoltaic (PV) grid-connected power generation has become an important direction of energy development. A grid-connected inverter is the key equipment in the PV grid-connected system. The efficiency and performance of the PV grid-connected inverter mainly depend on its topology and control technology. The PI controller has good dynamic and steady-state performance, which is widely used in the...
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