Abstract
The active-forced-commutated (AFC) bridge for high-voltage (HV) DC transmission has recently been proposed, which operates low-loss thyristor valves in the manner of a voltage source converter (VSC) with the assistance of a self-commutated full-bridge (FB) chain-link (CL) circuit, creating a hybrid VSC solution which retains the key advantage of high-efficiency performance found in conventional line-commutated-converters (LCC). The AFC-bridge enables fully controlled turn-on/off and four-quadrant operation for a symmetrical thyristor bridge to synthesize independent AC voltage based on a given DC-link voltage. From a system-level perspective, it inherits the key functionalities of a standard VSC, including bidirectional current flow and independent active/reactive power control, in combination with a number of favorable features common to LCC-HVDC implementations, including the enhanced voltage scalability, reduced complexity, DC-fault blocking capability and bipolar DC voltage operability. However, the slow commutation speed of high-capacity thyristors results in power quality issues due to low frequency harmonics, which need a certain level of passive filtering to ensure grid code compliance. Continuing previous work, this paper addresses several AFC-bridge grid-connection issues, including minimization of the AFC-bridge total passive filter capacity by adopting a predefined selective harmonic elimination (SHE) mode or by using a multiplexed configuration, and simulation analysis and validation of DC-fault-proof capability.
Original language | English |
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Title of host publication | Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 1192-1197 |
Number of pages | 6 |
Volume | 2017-January |
ISBN (Electronic) | 9781538611272 |
DOIs | |
Publication status | Published - 15 Dec 2017 |
Event | 43rd Annual Conference of the IEEE Industrial Electronics Society, IECON 2017 - Beijing, China Duration: 29 Oct 2017 → 1 Nov 2017 |
Conference
Conference | 43rd Annual Conference of the IEEE Industrial Electronics Society, IECON 2017 |
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Country/Territory | China |
City | Beijing |
Period | 29/10/17 → 1/11/17 |
Keywords
- active-forced-commutated (AFC) bridge
- DC fault reverse-blocking
- full-bridge chain-link (FB-CL)
- high efficiency
- selective harmonic elimination (SHE)
- thyristor
- total harmonic distortion (THD)
- trapezoidal waveform