Application of Circuit DQ Transformation to Current Source Inverter
The circuit DQ transformation is used to analyze a three-phase controlled-current PWM rectifier in this chapter. The DC operating point and AC transfer functions are completely determined. Most features of the converter are clearly interpreted. They are (
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Application of Circuit DQ Transformation to Current Source Inverter
The circuit DQ transformation is used to analyze a three-phase controlled-current PWM rectifier in this chapter. The DC operating point and AC transfer functions are completely determined. Most features of the converter are clearly interpreted. They are (1) the output voltage can be controlled from zero to maximum, (2) the system is equivalently an ideal current source in the steady state, (3) the system can be described as linear circuits, and (4) the input power factor can be arbitrarily controlled within a certain control range. A lot of this chapter is based on our papers [1, 2]. The circuit DQ transformation is used to analyze a three-phase controlled-current PWM rectifier in this chapter. The DC operating point and AC transfer functions are completely determined. Most features of the converter are clearly interpreted. They are (1) the output voltage can be controlled from zero to maximum, (2) the system is equivalently an ideal current source in the steady state, (3) the system can be described as linear circuits, and (4) the input power factor can be arbitrarily controlled within a certain control range. A lot of this chapter is based on our papers [1, 2].
9.1
Introduction
Aa an excellent DC voltage source of VSI-fed motor drive, the three-phase controlled-current PWM rectifier has been widely studied. Its numerous merits such as sinusoidal input current, power factor adjustment capability, and instantaneous power flow change make it different from the conventional phase controlled rectifier (PCR). Previous works are so much focused on the space vector input current control method [3, 4–6] that the rectified DC voltage should be larger than some value [5, 6], and nonlinear dynamic equation is therefore generated [3, 4–6]. A system control method that is based on the predetermined switching pattern, PWM is sometimes found in the literature [7]. A modeling based on the equational DQ transformation and its application to several control methods of the DC-side © Springer Science+Business Media Singapore 2016 C.T. Rim, Phasor Power Electronics, KAIST Research Series, DOI 10.1007/978-981-10-0536-7_9
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capacitor voltage are introduced [8, 9]. However, so far the following important features of the ideal rectifier are not clearly interpreted without the manipulation of complex equations: 1. 2. 3. 4.
The rectified DC voltage ranges from zero to its maximum. The rectified DC part is an ideal current source in the steady state. The power factor can be controlled arbitrary only within a certain control range. The system is linear with respect to the source voltage when it is open-loop controlled. 5. Full sets of the DC and linearized AC transfer functions. 6. Open loop control as well as closed-loop control of the system is allowable.
The features are independent of PWM patterns and circuit parameters. In this chapter, they are fully explained based on the recently proposed circuit
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