Abstract
Short-circuit faults in a receiving-end power system can lead to blocking events of the feed-in high-voltage direct-current (HVDC) systems, which may further result in system instability. However, security assessment methods based on the transient stability (TS) simulation can hardly catch the fault propagation phenomena between AC and DC subsystems. Moreover, effective emergency control strategies are needed to prevent such undesired cascading events. This paper focuses on power systems with multi-infeed HVDCs. An on-line security assessment method based on the electromagnetic transient (EMT)-TS hybrid simulation is proposed. DC and AC subsystems are modeled in EMTDC/PSCAD and PSS/E, respectively. In this way, interactions between AC and DC subsystems can be well reflected. Meanwhile, high computational efficiency is maintained for the on-line application. In addition, an emergency control strategy is developed, which coordinates multiple control resources, including HVDCs, pumped storages, and interruptible loads, to maintain the security and stability of the receiving-end system. The effectiveness of the proposed methods is verified by numerical simulations on two actual power systems in China. The simulation results indicate that the EMT-TS hybrid simulation can accurately reflect the fault propagation phenomena between AC and DC subsystems, and the coordinated emergency control strategy can work effectively to maintain the security and stability of systems.
Highlights
With the growing penetration of line-commutated converter-based high-voltage direct-current (LCC-HVDC) lines, power systems with multi-infeed HVDCs, where several HVDC lines feed into nearby AC systems, are becoming more common [1,2]
Generate an off-line control strategy table under the anticipated contingency set and pre-determined typical operating conditions, which will provide the initial solution of the decision-making model for the emergency control strategy; On-line security assessment based on electromagnetic transient (EMT)-transient stability (TS) hybrid simulation
This paper proposes an on-line pre-decision-making scheme, including security assessment and an emergency control strategy decision-making, for power systems with multi-infeed HVDCs
Summary
With the growing penetration of line-commutated converter-based high-voltage direct-current (LCC-HVDC) lines, power systems with multi-infeed HVDCs, where several HVDC lines feed into nearby AC systems, are becoming more common [1,2]. According to the above analysis, for power systems with multi-infeed HVDCs: (1) A security assessment method that can well reflect the fault propagation phenomena between AC and DC subsystems, and generate reliable results within an acceptable time should be studied; and (2) the emergency control strategy that can comprehensively coordinate multiple control resources while satisfying multiple critical security constraints is needed. An on-line pre-decision-making scheme, including security assessment and emergency control strategy decision-making, is proposed for power systems with multi-infeed HVDCs. The contributions are as follows:. AC and DC subsystems while maintaining the high computational efficiency; An emergency control strategy decision-making method that can coordinate HVDCs, pumped storages, and interruptible loads is developed subject to multiple security constraints.
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