| 摘要 |
The invention relates to a method 30 for de-energizing a chain-link converter 1 comprising one or more phase legs L1, L2, L3, each phase leg L1, L2, L3 comprising a number of series-connected converter cells 21, 22,..., 2n. The phase legs L1, L2, L3 are connected to a respective charging resistor RL1, RL2, RL3. The method 30 comprises the steps of: opening 31 AC circuit breakers 4L1, 4L2, 4L3 arranged between a power grid 3 and the chain-link converter 1, opening 32 charging resistors switches SL1, SL2, SL3 arranged in parallel with a respective one of charging resistors RL1, RL2, RL3, and circulating 33 a current within the chain-link converter 1 through the charging resistors RL1, RL2, RL3 and each phase leg L1, L2, L3, whereby the DC capacitor 71, 72,..., 7n are discharged. The invention also relates to a controller, computer program and computer program products. |
