There is an urgent need to address the transient synchronization stability (TSS) problem caused by the increasing penetration of renewable resources into the power network through grid-following converters (GFL-VSCs)....
详细信息
To address the abnormal vibration and noise in power grid transformers caused by stray currents from urban subways, a transformer instability identification method based on the mapping relationship between stray curre...
详细信息
Accurate estimation of the charging demand of electric vehicle (EV) users has a profound impact on the profitability of the EV aggregator (EVA). Existing studies concerning the market strategy of EVA normally assume t...
详细信息
With the further development of "double high" characteristics of powersystem, the traditional stability problem dominated by synchronous generator has gradually evolved into a new stability problem dominate...
详细信息
The two control objectives of voltage regulation and precise current sharing are conflicting in multi-bus DC microgrids. In this paper, a distributed control strategy is proposed, and it can achieve accurate current s...
详细信息
To enhance powersystem reliability and ensure the safety of substations, the utilization of dual-circuit outgoing lines in engineering projects is common for inverter-based power sources like photovoltaic power stati...
ISBN:
(数字)9781837242900
To enhance powersystem reliability and ensure the safety of substations, the utilization of dual-circuit outgoing lines in engineering projects is common for inverter-based power sources like photovoltaic power stations and direct-drive wind turbines. The fault characteristics of these dual-circuit lines differ significantly from those of single-line configurations. In the case of single-line, the fault current on the substation side is typically limited and contain minimal negative-sequence component due to the control mechanisms of the station's inverter. Conversely, in dual-circuit line, a fault occurrence in one line allows for the flow of considerable short-circuit currents and negative-sequence currents through the parallel non-faulty line in reverse direction. In order to tackle this issue, this paper proposes a novel principle for fault location based on transverse negative-sequence currents, specifically designed for dual-circuit outgoing lines of inverter-based power sources. This principle takes advantage of the negative-sequence current suppression inherent in inverters and achieves fault distance measurement by evaluating the relative ratio of negative-sequence currents in both lines. Building upon this theoretical foundation, a corresponding transverse fault protection scheme based on negative-sequence currents is presented. Experimental results validate the effectiveness of this scheme, demonstrating its capability to accurately identify both internal and external asymmetrical faults while remaining immune to fault transition resistances.
Both the renewable energy power station and the flexible DC converter are inverter-based power sources, where the output current's magnitude and phase are controlled, exhibiting weak feeding characteristics. In th...
ISBN:
(数字)9781837242900
Both the renewable energy power station and the flexible DC converter are inverter-based power sources, where the output current's magnitude and phase are controlled, exhibiting weak feeding characteristics. In the line with converters at both ends, distance protection at both ends fails to operate correctly. This paper analysed the composite sequence network of asymmetric short-circuit faults in line with converters at both ends, and proposes a distance protection scheme immune to transition resistance, capable of accurately measuring the fault distance. By utilizing the changes in electrical quantities after the breaker trips at one end, a non-pilot protection scheme that does not rely on communication is introduced. This protection scheme uses different principles at both ends of line with converters at both ends. simulation results show that the proposed protection can accurately identify asymmetric short-circuit faults in line with converters at both ends and can effectively and rapidly protect both the flexible DC converter and the renewable energy power station.
The regulation capability of the new powersystem dominated by renewable energy at the source side is gradually deteriorating. Exploiting the load-side regulation potential to participate in demand response has become...
详细信息
The integration of renewable energy generation, represented by wind power, into the powersystem has a significant impact on frequency security, and the characteristics of frequency distribution have gradually become ...
详细信息
In N-module motors, uniform carrier phase shifting (UCPS) by 2π/N between modules can effectively suppress torque harmonics caused by high-frequency switching of power devices. In multi-module motors with fractional-...
详细信息
暂无评论