Online parameter determination based adaptive single‐phase reclosing scheme for wind‐powered outgoing lines with shunt reactors

Abstract

As the only power output channel of wind farms, wind-powered outgoing lines carry the risk of reclosing to faults as an applied single-phase reclosing scheme recloses the outgoing line after a fixed time without distinguishing transient and permanent faults. Although various transient-fault identification (TFI) methods were proposed for conventional power transmission lines with shunt reactors, they can be hardly utilised on wind-powered outgoing lines with shunt reactors due to the influence of outgoing line complex working conditions and wind farms inconsistent output power. In this study, reactive power was calculated using the instantaneous power algorithm to obtain the equivalent reactance of the outgoing line faulty phase shunt reactor. Then, a TFI method for the outgoing lines with shunt reactors based on online parameter determination was proposed, a relevant adaptive single-phase auto-reclosing (ASPAR) scheme was established. Finally, the validity and feasibility of the proposed TFI method and ASPAR scheme were verified by conducting simulation experiments on the software PSCAD/ EMTDC. The experiments confirmed that the proposed ASPAR scheme can achieve immunity to changes in fault location and transition resistance, and are therefore suitable for inconsistent output power of wind farms and complex working conditions of outgoing lines.

Adaptive Autoreclosing Scheme for Line-to-Line Nongrounded Faults on Double-Circuit Transmission Lines Based on Phase-to-Phase Reactive Power

“…According to [20], the phase voltage of the nontripped phases may be affected by some external elements, including lightning strikes or high-frequency harmonics. These interferences can be restrained by adopting reactive power of the fault phase as the AED reference quantity.…”

“…Therefore, in a permanent fault scenario, PPRP has a relatively small amplitude and is mainly depicted as a DC form. According to [18] and [20], the model of the secondary arc can be expressed as (2)- (5).…”

“…With the voltage and current of different oscillation frequencies, PPRP calculated according to (1) covers five frequency components whose oscillation angular frequencies are 0, 2ω 1 , 2ω 2 , (ω 1 + ω 2 ), and (ω 1 − ω 2 ), respectively. According to [19] and [20], these five frequency components are expressed as follows:…”

“…Nonetheless, for transmission lines connected with apparatuses or facilities with may power electric devices installed, there might be some subsynchronous components injected into the nontripped phase(s). The frequency characteristics of these subsynchronous components may be similar to that of the free oscillation component; therefore, a misjudgment leading to reclosing failure may occur in this circumstance [20].…”

Applicability study of single‐phase reclosing in tie line of photovoltaic power plant

“…As for the three-phase reclosing method, compared with synchronous motors, PVS almost has no physical inertia and effective voltage control capability, which results in that it is very easy to disconnect from the power grid due to system frequency deviation and voltage deviation during the islanding operation [3,4]. To ensure the high reclosing success rate of PVS in the case of tie line transient faults, and considering that most of overhead transmission line faults are single-phase grounding faults [5], a feasible solution is to employ the single-phase reclosing device on the tie line of PVS [6]. However, as for the single-phase reclosing, when a single-phase grounding fault occurring in the tie line is cleared by the single-phase trip of protection, PVS will be in the status of non-full phase operating.…”