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In this paper, a LC tank circuit has been designed, fabricated and tested, to study the temperature dependence of the quality factor in the LC-type passive wireless temperature sensors. The performance of the wireless signal transmission is studied by a group of inductances and by studying the impedance characterization of the LC tank. A theoretical model of temperature dependence of quality factor...
Impedance is very important for power electronic systems because of the close relationship between impedance and system stability. The power converters are typical nonlinear dynamic systems in frequency domain. With a sinusoidal input voltage perturbation excitation, the input current contains not only the input perturbation frequency, but also multiple other frequency components. Therefore, the input...
To solve the reactive power sharing issue in droop control, many improved methods have been developed. However, existing methods can't provide both accurate and fast performance in reactive power sharing, no matter wireless or communication methods. In fact, rapidity is an important indicator for reactive power sharing control, especially when load changes frequently. In this paper, a fast reactive...
A new high-gain cylindrical dielectric resonator antenna (DRA) with a large bandwidth is proposed. A cylindrical dielectric resonator (DR), a double-annular patch and a metallic cylinder are used to obtain a large bandwidth and a high gain. The mode TM12 excited in the patch is used to enhance the gain of the DRA, and the cavity formed by the metallic cylinder provides a further higher gain and a...
Different from the traditional microgrid with a common ac bus, networked microgrid always suffers more serious reactive power sharing problems due to its complex inner configurations. In such a situation, the reactive power sharing errors among distributed generation (DG) units can't be eliminated effectively. Thus, an advanced reactive power sharing strategy that employs communication and virtual...
Before the stability analysis for AC distributed power system by using impedance based criterion, the impedance matrix of system must be captured exactly. The output impedance model of inverter is developed in this paper. The relationship between the impedance and the parameters of system is discussed. Disturbed current injection based, an impedance measurement unit is implemented. By injecting disturbed...
In paralleled inverters UPS system, Virtual impedance is applied widely in inverter to decouple the active power and reactive power of inverter and improve the power average sharing accuracy. Proper virtual impedance also can estimate the circulating currents resulted from the asymmetric parameters of different inverter modules. In practical paralleled inverters system, when one inverter prepares...
The converter transformer is one of the most significant components of a HVDC station. And the parameters of the converter transformer play an important role in the operation performance, technical and economic index in HVDC system. According to the valve's surge current level, in combination with ac maximal short-circuit capacity of three phase, rated dc voltage and dc current, this paper describes...
The low-voltage switching devices are widely used in all aspects of the power system. It is essential to verify performance after design, manufacture or repair. In our national standards and the international IEC standard, short-circuit test of the electrical products for use in the power system is very important, so it is necessary to research and develop the short-circuit test equipment and this...
High-density piezoelectric micromachined ultrasonic transducer (pMUT) arrays have been designed and fabricated using silicon based micromachined process. These devices are based on a novel structure called “reverse-bonding”. Experimental results show that they have excellent performance, suitable resonance frequency and high reliability. The fabricated pMUT arrays are very promising for 3-D medical...
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