Directional relays for distribution networks with distributed generation

Le, Trung Dung; Petit, Marc

doi:10.1049/cp.2012.0028

Cited by 4 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With regard to IIDG, a simple model is built with a DC source connected to main grid by means of DC/AC converter. A current control scheme is used for this converter and the output current of IIDG is limited to 1.5 pu by the control [13].…”

Section: Investigated Networkmentioning

confidence: 99%

“…Symmetrical component method is widely used for power protection purpose [11]. Based on this method, the novel algorithms for directional relays using only current measurements have been proposed in previous papers for line‐to‐ground faults [12] and line‐to‐line faults [13]. In the former case, the I 2 / I 0 ratio during fault, which is a complex number, is calculated and depicted on the complex plane.…”

Section: Algorithms For Directional Relays Without Voltage Sensorsmentioning

confidence: 99%

See 1 more Smart Citation

Directional relays without voltage sensors for distribution networks

Petit

2014

IET Generation, Transmission & Distribution

View full text Add to dashboard Cite

International audienceIn this study, algorithms for directional relays using only current measurements are presented. Developed for radial distribution networks, these algorithms will determine fault direction based on ratios between variations of sequence currents during and before faults: ΔI 2/ΔI 0 ratio for line-to-ground faults and the ΔI 2/ΔI 1 ratio for line-to-line faults. The ratios are used as input of a support vector machine classifier, which was trained beforehand thanks to simulation tools. The classifier classifies ratios into two categories, according to the fault location: upstream or downstream towards the relay. Test results from simulations show good performances of the algorithms in most cases, with the presence of different distributed generation technologies. Moreover, impact of certain factors on algorithms, such as measurement errors, high-impedance faults or network reconfiguration, is studied. Finally, the implementation of algorithms is also discussed

show abstract

Section: Investigated Networkmentioning

confidence: 99%

Section: Algorithms For Directional Relays Without Voltage Sensorsmentioning

confidence: 99%

Directional relays without voltage sensors for distribution networks

Petit

2014

IET Generation, Transmission & Distribution

View full text Add to dashboard Cite

show abstract

“…The model of IIDG is built as in [1] with the current limitation. In the same way as case of SG, error rates after reconfiguration -with and without resetting of decision boundaries -are presented in Table VI.…”

Section: ) Algorithm For Relay R2mentioning

confidence: 99%

“…For relays that are installed along the feeder, this function may become more expensive because voltage sensors are usually unavailable along the feeder. For this reason, a directional relay using only current measurement [1] can be an interesting solution in term of cost reduction. Its operation is based on the I 2 /I 1 or I 2 / I 1 ratio (APPENDIX A), which can be conveniently calculated by the digital techniques currently used in protection devices.…”

mentioning

confidence: 99%

Directional relays without voltage sensors for distribution grids: Optimal boundaries for fault direction estimation

Le¹,

Petit²

2013

2013 IEEE Grenoble Conference

View full text Add to dashboard Cite

Nowadays, with the presence of Distributed Generators (DGs) in the medium voltage (MV) networks, the false tripping problem can occur to traditional overcurrent protections. Directional relay is a solution. To reduce the cost, a principle for the directional relay using only current measurements, which is based on symmetrical components method, was proposed and tested with simulations in case of Inverter-Interfaced DGs [1]. Calculated from the sequence currents, both the I 2 /I 1 and I 2 / I 1 ratios created two separate areas on the complex plane from which upstream or downstream faults could be easily determined. However, in case of Synchronous Generators, these two areas become so close that they can overlap each other. Hence the overlap causes some errors in the directional algorithm. In this paper, optimal boundaries for separating the two areas are studied. The algorithm shows good performances in most situations with these boundaries defined by Support Vector Machine technique.

show abstract

“…In [15], the optimal settings of overcurrent relays are calculated by considering faults in different locations using the downstream-upstream method. A method using positive and negative sequence currents is also presented [16]. In fact, the proposed algorithm for detecting sympathetic trips in the presence of DG has only been investigated to detect line-toline (LL) short circuits.…”

Section: Introductionmentioning

confidence: 99%

Overarching Preventive Sympathetic Tripping Approach in Active Distribution Networks Without Telecommunication Platforms and Additional Protective Devices

et al. 2022

View full text Add to dashboard Cite

Nowadays, distributed generation (DG) has made it possible to generate electricity close to the consumption site, resulting in improved efficiency, less environmental pollution, and higher economic profit. These advantages have led to increased penetration of DGs in the distribution system. Protective devices in a distribution system are set by considering the main substation as the only source for feeding short circuit current. However, with the increased influence of DGs as the second main source of short circuit current in distribution systems the short circuit level changes, which leads to false tripping of protective devices, including overcurrent relays. A sympathetic trip, occurring due to a fault in the adjacent feeder, is one of the most serious challenges. This paper analyzes the sympathetic trip in the presence of synchronous based DGs. The equations related to the participation of DGs and upstream network in feeding the short circuit current are obtained. The effect of different parameters on the probability of occurrence of a sympathetic trip is also investigated. Moreover, a novel fast solution is presented for overcoming the sympathetic trip of synchronous based DGs. The proposed method is introduced using the positive-sequence currents of the DGs and main substation. The sympathetic trip is predicted by adopting this prediction index and its occurrence is avoided. The proposed methodology is independent of telecommunication platforms and additional protective devices and can be applied to various short circuits. The method is tested on a network by simulating in DIgSILENT PowerFactory software. Simulation results show the effectiveness of the proposed methodology in predicting and preventing sympathetic trips.

show abstract

Directional relays for distribution networks with distributed generation

Cited by 4 publications

References 0 publications

Directional relays without voltage sensors for distribution networks

Directional relays without voltage sensors for distribution networks

Directional relays without voltage sensors for distribution grids: Optimal boundaries for fault direction estimation

Overarching Preventive Sympathetic Tripping Approach in Active Distribution Networks Without Telecommunication Platforms and Additional Protective Devices

Contact Info

Product

Resources

About