A Method for Reducing the Dead-Time Voltage and Impedance Voltage in a Series Voltage Compensator

Abstract

Many research groups are developing series voltage compensators. In the series converter, since a transformer is used in series in the power system, the power system current flows into the voltage source inverter through the transformer. The inverter current, which is determined by the transformation ratio, gives rise to an error voltage that consists of a dead-time voltage and an impedance voltage; the error voltage is generated even when the reference voltage is zero. This paper describes the generation mechanism of the error voltage and proposes a method for reducing the error voltage.

A Strategy for the Design of the LCR Filter in a Series Voltage Compensator

“…According to Fig. The effective value I inv of the rated current is constant, but because the difference voltage varies depending on the design condition {%I ri p }, A 1 and θ 1 must be varied [2,9]. We see that the range in which the gain is small and T s is low is in the vicinity of Q = 3.…”

“…When a m ≤ 1 − 2T d f f c is satisfied for the peak modulation factor, the output voltage can be linear with respect to the modulation factor [9]. The voltage reduced due to the dead time (dead time voltage) must be taken into consideration in the output voltage value of the PWM inverter [2]. From the equation for finding the maximum modulation factor a m described above and the equation for the modulation factor [9] used to compensate the voltage drop resulting from the dead time voltage, the following equation for the maximum carrier frequency can be derived:…”

“…However, in this paper we perform our analysis at the rated current. The effective value I inv of the rated current is constant, but because the difference voltage varies depending on the design condition {%I ri p }, A 1 and θ 1 must be varied [2,9]. A n is set to a fixed value using the amplitude of the harmonic compensation…”

“…In order to maintain voltage at the load end, the user power reception point, at a constant level even during an instantaneous voltage drop, series voltage compensators are used [1]. The abbreviation SVC is used as an abbreviation for for a series voltage compensator [1,2], and the abbreviation SVC will be used in this paper as well. An SVC is a device that generates a voltage synchronized with the system voltage by means of a PWM inverter, and superimposes it on the deficient voltage by means of a transformer inserted in series into the system.…”