scholarly journals Technology and application of high speed fault location,isolation and self-healing in DC distribution network

2021 ◽  
Vol 256 ◽  
pp. 01042
Author(s):  
Kuo Tan ◽  
Guo Hu ◽  
Hai Wu ◽  
Feng Huang
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Fault Location ◽  
Reactive Power ◽  
Operation Mode ◽  
Distribution Network ◽  
Self Healing ◽  
Continuous Increase ◽  
Dc Distribution ◽  
Flexible Operation

With the continuous increase of DC load, the research of DC distribution network has been developed rapidly. Compared with the traditional AC distribution network, DC distribution network has the advantages of less conversion times, high efficiency, low cost, simple control structure, no need to consider the frequency and phase and reactive power compensation equipment. Compared with AC distribution network, DC distribution network has more flexible operation mode and less power supply points However, the more flexible operation mode of DC distribution network also brings the problem of fault location and self-healing. The fault location, isolation and self-healing control strategy of AC distribution network can not be applied to DC distribution network. In this paper, a high-speed fault location, isolation and self-healing method for DC distribution network is proposed. Based on high-speed goose communication, a comprehensive evaluation is carried out according to the fault status of the power grid, and the millisecond level fault location, isolation and self-healing of DC distribution network are completed. The coordinated control equipment based on this method is successfully applied in Tongli integrated energy service center. When the fault occurs in this area, uninterrupted power supply is realized in the non fault area, which verifies the correctness and practicability of this method.

Reliability Analysis of Distribution Network with Integrated Photovoltaic Power Generation

2014 ◽  
Vol 672-674 ◽  
pp. 956-960
Author(s):  
Ke Huang ◽  
Xin Wang ◽  
Yi Hui Zheng ◽  
Li Xue Li ◽  
Yan Ling Liu
Keyword(s):  
Power Generation ◽  
Power Supply ◽  
Distribution System ◽  
Operation Mode ◽  
Distribution Network ◽  
Photovoltaic Power ◽  
Reliability Calculation ◽  
Set Up ◽  
Pv Generation ◽  
Equivalent Method

To analyze the influence of distribution network with grid-connected photovoltaic (PV) generation on the power supply reliability, in this paper it firstly regards interconnected PV generation as an equivalent generator with rated capacity as well as the island operation mode of PV to set up a model for reliability calculation and analysis. Based on the network equivalent method, the structure of distribution system with PV is simplified and then the reliability indexes of distribution system are worked out based on Failure Mode and Effects Analysis (FMEA). At last, a comparative calculation between the distribution network with incorporated PV generations and that without PV generations is made. After analyzing a real example, the results suggest that integrating PV power generations reasonably into the distribution network can enhance the reliability of whole distribution system.

Conventional DC Voltage Operating System for High Speeed Traction Power Supplies Using LLC-HPQC Control

2015 ◽  
Vol 4 (4) ◽  
pp. 118
Author(s):  
Ch. Lenin Babu ◽  
P. Harinath Reddy ◽  
T. Reddi Sekhar
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Reactive Power ◽  
Design Procedure ◽  
Power Supplies ◽  
Parameter Design ◽  
Voltage Level ◽  
Harmonic Compensation ◽  
Traction Power Supply ◽  
Traction Power

<p>In this paper a hybrid power quality compensator (HPQC) is proposed for compensation in cophase traction power supply and minimum dc operation voltage is achievable for high-speed traction power supply. The parameter design procedure for minimum dc operation voltage in HPQC as well as minimum voltage rating with load PF is discussed. The detailed discussions of proposed circuit configurations of HPQC are provided in section II, together with comparison with conventional RPC. In comparison with conventional railway power compensator proposed HPQC can achieve reduced dc link voltage level. It is also verified through simulations results that the LLC-HPQC would operate at the minimum voltage with the proposed parameter design. HPQC is able to provide system unbalances, reactive power, and harmonic compensation in cophase traction power with reduced operation voltage. The cophase traction power supply with proposed HPQC is suitable for high-speed traction applications.</p>

scholarly journals Detection of Self-Healing Discharge in Metallized Film Capacitors Using an Ultrasonic Method

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1893 ◽  
Author(s):  
Yusheng Ma ◽  
Haitao Shen ◽  
Chunming Pei ◽  
Huanyu Zhang ◽  
Muhammad Junaid ◽  
...  
Keyword(s):  
High Speed ◽  
Performance Test ◽  
Reactive Power ◽  
Ultrasonic Method ◽  
Test Procedure ◽  
Detection Algorithm ◽  
The Self ◽  
International Electrotechnical Commission ◽  
Self Healing ◽  
Ultrasonic Emission

Benefiting from self-healing features, metallized film capacitors (MFCs) are widely employed to compensate reactive power (VAR) and thus improve the performance of AC systems. To ensure the aforementioned functions, self-healing testing is a compulsory quality inspection for every type of MFC. In 2014, the International Electrotechnical Commission (IEC) issued a standard that recommended a general and instructive test procedure based on audible noise or ultrasound signals. However, more details relevant to this high voltage (HV) test were not provided. In this paper, we focused on the ultrasonic detection technique to reveal the self-healing characteristics of two typical MFCs. By launching a series of HV tests with star and delta MFCs, the waveform features, discharge energy, and spectrum distributions were analyzed. It was observed that the partial discharge always occurs before self-healing discharge with the same spectrum features ranging above 40 kHz. To solve the entanglement of these two discharge processes, a relative amplitude difference method is proposed. Based on the experimental observations, a detection algorithm incorporated with the ultrasonic emission sensors, preamplifier, and high-speed A/D converter was developed to assist the self-healing performance test.

scholarly journals Two-Stage Stochastic Programming Scheduling Model for Hybrid AC/DC Distribution Network Considering Converters and Energy Storage System

2019 ◽  
Vol 10 (1) ◽  
pp. 181
Author(s):  
Peng Kang ◽  
Wei Guo ◽  
Weigang Huang ◽  
Zejing Qiu ◽  
Meng Yu ◽  
...  
Keyword(s):  
Wind Power ◽  
Reactive Power ◽  
Distribution Network ◽  
Stochastic Scheduling ◽  
Second Order ◽  
Mixed Integer ◽  
Two Stage ◽  
Dc Distribution ◽  
Scheduling Model ◽  
Second Order Cone

The development of DC distribution network technology has provided a more efficient way for renewable energy accommodation and flexible power supply. A two-stage stochastic scheduling model for the hybrid AC/DC distribution network is proposed to study the active-reactive power coordinated optimal dispatch. In this framework, the wind power scenario set is utilized to deal with its uncertainty in real time, which is integrated into the decision-making process at the first stage. The charging/discharging power of ESSs and the transferred active/reactive power by VSCs can be adjusted when wind power uncertainty is observed at the second stage. Moreover, the proposed model is transformed into a mixed integer second-order cone programming optimization problem by linearization and second-order cone relaxation techniques to solve. Finally, case studies are implemented on the modified IEEE 33-node AC/DC distribution system and the simulation results demonstrate the effectiveness of the proposed stochastic scheduling model and solving method.

Reliability Evaluation of Mid-Voltage DC Distribution Network with Multiple Topologies

2014 ◽  
Vol 666 ◽  
pp. 112-118 ◽  
Author(s):  
Jia Si Zeng ◽  
Yi Bo Gao ◽  
Feng Yang ◽  
Xi Dong Xu ◽  
Peng Qiu ◽  
...  
Keyword(s):  
Power Electronics ◽  
Sequential Monte Carlo ◽  
Reactive Power ◽  
Transmission Loss ◽  
Distribution Network ◽  
Reliability Evaluation ◽  
Power Electronic ◽  
Electronic Components ◽  
Reliability Models ◽  
Dc Distribution

With the development of power electronics, DC distribution network has advantages in power supplying for DC loads, saving transmission loss of reactive power and improving power quality, when compared with traditional AC distribution network. Since DC distribution network has several multiple topologies, lots of power electronic components and DGs, the traditional reliability evaluation methods aren’t applicable any more. Hence, the reliability models of power electronics and DGs are built in this paper, and a hybrid method combining minimum-cut with non-sequential Monte Carlo is presented. Moreover, three topologies of mid-voltage DC distribution network are designed based on IEEE RBTS bus6, by which the feasibility of the method is validated. Results show that two-terminal network is more reliable than radial and looped network.

An Application of Heuristic-Search Based Tree Model in Fault Analysis of Distribution Network

2012 ◽  
Vol 614-615 ◽  
pp. 1827-1832
Author(s):  
Cai Qiang Wang ◽  
Jie Li ◽  
Qing Bin Wang ◽  
Song Hu
Keyword(s):  
Power Supply ◽  
Heuristic Search ◽  
Fault Location ◽  
High Reliability ◽  
Distribution Network ◽  
Processing System ◽  
Fault Analysis ◽  
Power System Security ◽  
Tree Model ◽  
Network Fault

Along with the increase of need for high reliability of the power system security, it is important to build up a distribution fault analysis network and processing system, which can provide decision-making help for dispatching personnel. This paper introduced framework of the distribution network fault analysis and processing system, and analyze the fault location, isolation, generation and evaluation of power supply reconfiguration strategy. Tree model and Heuristic search were used for fault location and power supply route switching strategy.

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