A Current-Comparator-Based System for Calibrating Active/Reactive Power and Energy Meters

1983 ◽  
Vol 32 (1) ◽  
pp. 147-149 ◽  
Author(s):  
W. J. M. Moore ◽  
Eddy So
Keyword(s):  
Reactive Power ◽  
Current Comparator ◽  
Power And Energy ◽  
A Current

Effect of Feedback Control on the Power Consumption of Induced-Strain Actuators

2000 ◽  
Author(s):  
Sriram Chandrasekaran ◽  
Douglas K. Lindner ◽  
Don Leo
Keyword(s):  
Structural Control ◽  
Power Flow ◽  
Reactive Power ◽  
Flow Characteristics ◽  
Control Laws ◽  
The Real ◽  
Reactive Power Flow ◽  
Flow Through ◽  
Sinusoidal Disturbance ◽  
A Current

Abstract In this paper we study the closed loop power flow characteristics between a controlled piezoelectric actuator and a current controlled drive amplifier for two different structural control laws. We determine the real and reactive power flow through the structure and actuator into the amplifier when the structure is excited with a sinusoidal disturbance force under both control laws. The dependence of the real and reactive components of the power on the material properties of the actuator, structure and the configuration of the controller is presented. These real and reactive power estimates are useful for sizing the drive amplifier for the actuator.

A current-comparator-based system for on-site calibrations of high voltage PMU systems

2012 ◽  
Author(s):  
Eddy So ◽  
Rejean Arseneau ◽  
Yi-hua Tang ◽  
Gerard Stenbakken ◽  
Tom Nelson
Keyword(s):  
High Voltage ◽  
Current Comparator ◽  
A Current

Development of a Hysteresis Amplifier with an H-bridge Drive for Self-Sensing Magnetic Suspension

2000 ◽  
Vol 12 (3) ◽  
pp. 218-223 ◽  
Author(s):  
Takeshi Mizuno ◽  
◽  
Yuji Ishino
Keyword(s):  
Feedback Control ◽  
Magnetic Suspension ◽  
Switching Frequency ◽  
Switching Rate ◽  
Load Impedance ◽  
Current Comparator ◽  
Switching Times ◽  
Switching Signal ◽  
Hysteresis Control ◽  
A Current

A switching amplifier with an H-bridge drive was developed for self-sensing magnetic suspension. In this amplifier, switching times are controlled by a current comparator with a small hysteresis. The amplifier implemented with such hysteresis control has asynchronous characteristics so that the switching rate depends on the load impedance. When the hysteresis amplifier is used for magnetic suspension, the gap between the suspended object and the electromagnet can be estimated from the switching frequency. Since the Hbridge reverses the polarity of the voltage applied to the coil alternatively, the switching frequency is insensitive to the value of current command to the amplifier. The F/V conversion of the switching signal was used for feedback control with the result that self-sensing suspension was achieved.

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