A method of fault clearance for a voltage source converter that interconnects a DC network and an AC network, the voltage source converter being connected to the DC network via one or more DC circuit interruption devices, the method comprising the steps of: (a) detecting a fault in the DC network; (b) carrying out a primary protection sequence, wherein the step of carrying out the primary protection sequence involves carrying out a first sub-sequence that includes the steps of: i. opening the or each DC circuit interruption device, ii. setting a DC power order of the voltage source converter to zero, and iii controlling the voltage source converter to exchange reactive power with the AC network, wherein the step of carrying out the primary protection sequence involves the steps of: a. counting a re-close time; b. carrying out the first sub-sequence; c. checking whether the re-close time has elapsed; and d. repeating the first sub-sequence if the re-close time has not elapsed; and wherein the step of carrying out the primary protection sequence further involves the step of carrying out a second sub-sequence if the re-close time has elapsed, the second sub-sequence including the steps of: i. closing the or each DC circuit interruption device; ii. setting a DC power order of the voltage source converter to a non-zero level that is below a pre-fault DC power order of the voltage source converter; iii controlling the voltage source converter to exchange reactive power with the AC network; iv detecting whether the fault is still present in the DC network; and v. restoring the DC power order of the voltage source converter to its pre-fault value if the fault is not detected in the DC network, and repeating the step of carrying out the primary protection sequence if the fault is detected in the DC network. (a) detecting a fault in the DC network; (b) carrying out a primary protection sequence, wherein the step of carrying out the primary protection sequence involves carrying out a first sub-sequence that includes the steps of: i. opening the or each DC circuit interruption device, ii. setting a DC power order of the voltage source converter to zero, and iii controlling the voltage source converter to exchange reactive power with the AC network, wherein the step of carrying out the primary protection sequence involves the steps of: a. counting a re-close time; b. carrying out the first sub-sequence; c. checking whether the re-close time has elapsed; and d. repeating the first sub-sequence if the re-close time has not elapsed; and wherein the step of carrying out the primary protection sequence further involves the step of carrying out a second sub-sequence if the re-close time has elapsed, the second sub-sequence including the steps of: i. closing the or each DC circuit interruption device; ii. setting a DC power order of the voltage source converter to a non-zero level that is below a pre-fault DC power order of the voltage source converter; iii controlling the voltage source converter to exchange reactive power with the AC network; iv detecting whether the fault is still present in the DC network; and v. restoring the DC power order of the voltage source converter to its pre-fault value if the fault is not detected in the DC network, and repeating the step of carrying out the primary protection sequence if the fault is detected in the DC network. i. opening the or each DC circuit interruption device, ii. setting a DC power order of the voltage source converter to zero, and iii controlling the voltage source converter to exchange reactive power with the AC network, a. counting a re-close time; b. carrying out the first sub-sequence; c. checking whether the re-close time has elapsed; and d. repeating the first sub-sequence if the re-close time has not elapsed; i. closing the or each DC circuit interruption device; ii. setting a DC power order of the voltage source converter to a non-zero level that is below a pre-fault DC power order of the voltage source converter; iii controlling the voltage source converter to exchange reactive power with the AC network; iv detecting whether the fault is still present in the DC network; and v. restoring the DC power order of the voltage source converter to its pre-fault value if the fault is not detected in the DC network, and repeating the step of carrying out the primary protection sequence if the fault is detected in the DC network.