发明名称 |
Method and controller for protecting a voltage source converter |
摘要 |
A method in a controller for protection of a voltage source converter including one or more phases, each phase including one or more series-connected converter cells. Each converter cell has a by-pass switch for enabling by-pass thereof. The method includes the steps of detecting an over-voltage condition, and controlling simultaneously the by-pass switches of each converter cell, so as to bypass the converter cells upon detection of such over-voltage condition. The invention also encompasses a controller, computer programs and computer program products. |
申请公布号 |
US9337645(B2) |
申请公布日期 |
2016.05.10 |
申请号 |
US201314142224 |
申请日期 |
2013.12.27 |
申请人 |
ABB Technology AG |
发明人 |
Hasler Jean-Philippe;Monge Mauro;De Oliveira Marcio |
分类号 |
H02M7/5387;H02H3/20;H02M1/32;H02M7/483 |
主分类号 |
H02M7/5387 |
代理机构 |
Whitmyer IP Group LLC |
代理人 |
Whitmyer IP Group LLC |
主权项 |
1. A method in a controller for protection of a voltage source converter comprising three phases connected in delta connection, each phase comprising two or more series-connected converter cells and a respective phase reactor, each converter cell comprising a half-bridge converter cell or a full converter cell, further each converter cell having a by-pass switch connected in parallel with the respective converter cell for enabling by-pass thereof, the method comprising the steps of:
detecting an over-voltage condition, wherein the step of detecting the over-voltage condition comprises measuring an AC voltage of a power grid to which the voltage source converter is connected and determining this AC voltage to exceed a maximum operation voltage of the voltage source converter, and/or measuring a DC voltage of the one or more converter cells and determining this DC voltage to exceed a preset value, and/or measuring a current in the one or more phases and determining this current to exceed a preset value, and controlling simultaneously the by-pass switches of each converter cell to be configured in closed position so as to short-circuit the converter cells and by-pass the converter cells upon detection of the over-voltage condition, wherein the voltage source converter enters a passive mode upon the converter cells being by-passed, in which in the passive mode the respective phase reactor of each of the three phases absorbs inductive overcurrent caused by the detected overvoltage condition. |
地址 |
Zurich CH |