The period discrete control technique and digital phase-lock loop technique are applied to DC capacitor voltage control, the corrected value of compensation current in next power frequency period is calculated by nonlinear average current compensation algorithm, therefore the compensation current feedback control is implemented.
Shunt voltage controller of power quality will be deeply studied in this paper to restrain harmonic current, compensate reactive power and keep symmetry of the current of the power source. A practical control device of electrical power quality is developed.
Both controls algorithms are simultaneously compute the reference of series part and shunt part, which simultaneously harmonize voltage compensate and current compensate.
To improve the compensation performance of active power filter (APF), taking the direct compensatory component detection method of three phase system as theoretical basis and based on field programmable gate array (FPGA) device and high speed A/D conversion, a detecting method of compensation component of harmonic currents in digital APF is proposed.
为提高有源电力滤波器(Active Power Filter,APF)的补偿性能,以理想传输量分离法为理论基础,提出了一种基于现场可编程逻辑阵列(Field Programmable Gate Array,FPGA)器件和快速模/数转换(A/D)的数字式有源电力滤波技术中谐波电流补偿分量的检测方法。
Then the two applications of Bergeron Model inprotection algorithm are discussed, one is the application in differentialequations algorithm, the other is the application in the compensation ofcapacitance current.
It was shown that the current compensation could be correctly determined by measuring the total current with the Rogowski loops placed inside the drift pipe and not with resistive shunts.
The current-compensation factor fm of a high-current relativistic electron beam (REB) with an energy Ee = 1.1 MeV, a current Ib = 24 kA, and a pulse duration tp = 60 ns was investigated.
This is a new device for electro-chemical analysis. Made up of integrated circuits, the apparats is stable in quality. Apart from those properties com-mon to all polarographs, it has the following aoutstanding features.The apparatus is small, light, portable and durable. The power consumption is low. Electrolytic Cell in common use for both two-electrode and three -electrode system. Besides, to eliminate the poisonous effect resulting from the use of large quantities of mercury, a mercury film electrode has...
By using the laboratory experiment data, this paper analysed theoretically the performance and the characteristics of three types of home made earthleak-age relay (JY82, JL80 and JJKB30) , namely, the acting value of leakage resistance, time of action and compensation of capacitive current which flows from the three phase lines into the ground.
After analyzing the basic principle and characteristics of current leakage protection with selectivity, the author puts forward a new technique, namely, current leakage protection with zero-sequence current compensation. The features of the method are analyzed, and the application of the protection apparatus in coal mines is introduced.
电流补偿
current compensation
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