Abstract
This paper proposes a novel directional pilot protection method based on the transient energy for bipolar HVDC line. Supposing the positive direction of current is from DC bus to the DC line, in the case of an internal line fault, the transient energies detected on both sides of the line are all negative within a short time, which denotes the positive direction fault; while for an external fault, the transient energy on one end is positive, which means a negative direction fault, but the transient energy on the opposite end is negative, which indicates that the fault direction is positive. According to these characteristics, an integration criterion identifying fault direction is constructed. In addition, through setting a fixed energy threshold, the faulted line and lightning disturbance can also be discriminated. Simulation results from UHVDC transmission system show the validity of the proposed protection method.
Highlights
Compared with the high voltage AC power transmission, HVDC power transmission has some advantages, such as larger transmission capacity, longer transmission distance, lower line loss, etc., which is becoming an important power transmission way on asynchronous grid interconnection and clean energy power integration [1,2,3]
The primary protections used in HVDC line are traveling wave protection and voltage variation protection, which have poor ability to resist the high ground resistance fault [4]
In [13, 14], authors propose the distance protection methods for HVDC line, but the high ground resistance fault still has a negative influence on their protection performances
Summary
Compared with the high voltage AC power transmission, HVDC power transmission has some advantages, such as larger transmission capacity, longer transmission distance, lower line loss, etc., which is becoming an important power transmission way on asynchronous grid interconnection and clean energy power integration [1,2,3]. The primary protections used in HVDC line are traveling wave protection and voltage variation protection, which have poor ability to resist the high ground resistance fault [4] Their performances are affected by other disturbance signals. According to the boundary characteristics of HVDC line, some protection methods only using one-end information are proposed in [9,10,11,12] These methods have fast speed, their sensitivity and reliability are still influenced by the fault resistance, in addition, it is difficult to set the threshold value. In [13, 14], authors propose the distance protection methods for HVDC line, but the high ground resistance fault still has a negative influence on their protection performances. To verify the performance of the proposed method, a bipolar HVDC transmission system model is built, and extensive simulations are carried out
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