A New Differential Backup Protection Strategy for Smart Distribution Networks: A Fast and Reliable Approach

Abstract

The integration of distributed generations (DGs) is transforming the traditional radial single-source distribution system into a complex multi-source one which requires its related protection is able to maintain proper coordination under bidirectional power flow conditions. Although the conventional backup protection methods are effective up to a certain level of DG penetration, they are incompetent for higher service demands such as high DG penetration and protective rapidity. To deal with such a problem, a fast and reliable backup protection strategy is presented on the basis of a proposed device detection method. In the proposed backup strategy, the device failure-related backup protection is started in advance to accelerate the fault isolation by locking the failed primary protection which can be predicted by the proposed device detection method. The presented strategy possesses an excellent performance on rapidity and stability. Particularly, the fault isolation area is only expanded to the upper level circuit breaker via our protection strategy. The performance of the proposed backup strategy has been validated by the realistic system and the real-time digital simulator (RTDS) system. INDEX TERMS Backup protection, differential protection, device detection, distribution networks.

The Communication System and its Impacts on Line Current Differential Protection in Distributed Feeder Automation

“…Under normal conditions, a PD sends the data request frame to other PDs with T 0 intervals. A PD can not only confirm the quality of the communication system, but also checks the sensor by calculating the real-time data [30]. Once the PD detects the exception on the electrical lines, it will send a data request command immediately.…”

“…Correspondingly, the return data frames have a high latency in IES9 and IES10, because both the data exchanged between PDs and the data uploaded The LCDP calculation result of PD 32 is shown in Table 5. The proportion of fault current (PFC) [30] of the upstream protection zone composed of PD 31 , PD 32 , and PD 33 is smaller than the threshold S 0 , and the upstream verification zone composed of PD 2 , PD 32 , and PD 33 is the same. According to the LCPD algorithm, there is no fault on the upstream line of PD 32 .…”

On-Line PID Parameters Optimization Control for Wind Power Generation System Based on Genetic Algorithm

“…Nowadays, owing to the shortage of fossil energy, the wind power is considered as a primary candidate of the primary energy source in the future. However, an instability of the wind power brings a great challenge for the practical applications [1]- [5]. It is therefore necessary to find an effective control method to address this issues aforementioned above.…”

IEC 61850-Based Centralized Busbar Differential Protection with Data Desynchronization Compensation

“…IEC 61850-based centralized protection has been widely studied over the past several decades [9][10][11][12][13][14][15][16][17][18][19]. Synchronization of data received from intelligent electronic devices (IEDs) located in substations is Energies 2020, 13, 967 2 of 15 essential.…”

“…The recent IEC/IEEE 61850-9-3 defined an IEEE Std 1588 Precision Time Protocol (PTP) to increase data synchronization precision [20]. The methods of [14][15][16][17][18][19] utilized this PTP to synchronize IED data precisely. However, the PTP is costly to implement and the possible jamming problem remains in its master clock.…”