Method and apparatus for stabilizing voltage of intermediate circuit of frequency converter
First Claim
1. A method of damping voltage oscillation of a voltage intermediate circuit of a frequency converter, the frequency converter comprising a half controlled rectifier bridge coupled to a supply network, the method comprisingdetermining magnitude (Uc) of voltage of the voltage intermediate circuit,determining magnitude (Uin) of rectified voltage of the supply network,forming a derivative of a difference (Uin−
- Uc) between the rectified voltage of the supply network and the voltage of the voltage intermediate circuit,delaying firing of controllable components of the rectifier bridge on the basis of the formed derivative.
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Abstract
A method and an apparatus for damping voltage oscillation of a voltage intermediate circuit of a frequency converter, the frequency converter comprising a half controlled rectifier bridge coupled to a supply network. The method comprises determining magnitude (Uc) of voltage of the voltage intermediate circuit, determining magnitude (Uin) of rectified voltage of the supply network, forming a derivative of a difference (Uin−Uc) between the rectified voltage of the supply network and the voltage of the voltage intermediate circuit, delaying firing of controllable components of the rectifier bridge on the basis of the formed derivative.
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Citations
4 Claims
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1. A method of damping voltage oscillation of a voltage intermediate circuit of a frequency converter, the frequency converter comprising a half controlled rectifier bridge coupled to a supply network, the method comprising
determining magnitude (Uc) of voltage of the voltage intermediate circuit, determining magnitude (Uin) of rectified voltage of the supply network, forming a derivative of a difference (Uin− - Uc) between the rectified voltage of the supply network and the voltage of the voltage intermediate circuit,
delaying firing of controllable components of the rectifier bridge on the basis of the formed derivative. - View Dependent Claims (2, 3)
- Uc) between the rectified voltage of the supply network and the voltage of the voltage intermediate circuit,
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4. An apparatus for damping voltage oscillation of a voltage intermediate circuit of a frequency converter, the frequency converter comprising a half controlled rectifier bridge coupled to a supply network, the apparatus comprises
means for determining magnitude (Uc) of voltage of the voltage intermediate circuit, means for determining magnitude (Uin) of rectified voltage of the supply network, derivation means for forming a derivative of a difference (Uin− - Uc) between the rectified voltage of the supply network and the voltage of the voltage intermediate circuit, and
means for delaying firing of controllable components of the rectifier bridge on the basis of the formed derivative.
- Uc) between the rectified voltage of the supply network and the voltage of the voltage intermediate circuit, and
Specification