Pilot protection scheme for distribution network considering low voltage ride‐through of inverter‐interfaced distributed generators

2020 ◽  
Vol 15 (11) ◽  
pp. 1613-1621
Author(s):  
Fengxian Zhao ◽  
Zhen Meng ◽  
Yongqin Li
Keyword(s):  
Low Voltage ◽  
Distribution Network ◽  
Protection Scheme ◽  
Low Voltage Ride Through ◽  
Distributed Generators ◽  
Pilot Protection

MULTI UNITS OF SINGLE PHASE DISTRIBUTED GENERATION COMBINED WITH BATTERY ENERGY STORAGE FOR PHASE POWER BALANCING IN DISTRIBUTION NETWORK

2016 ◽  
Vol 78 (10-4) ◽  
Author(s):  
Amirullah Amirullah ◽  
Mochamad Ashari ◽  
Ontoseno Penangsan ◽  
Adi Soeprijanto
Keyword(s):  
Energy Storage ◽  
Single Phase ◽  
Low Voltage ◽  
Distribution Network ◽  
Battery Energy Storage ◽  
Current Harmonics ◽  
Line Current ◽  
Distributed Generators ◽  
Distribution Line ◽  
Battery Energy

Randomly installed distributed generators (DGs) in households may cause unbalanced line current in a distribution network. This research presents a battery energy system for balancing of line current in a distribution network involving multi units of single phase photovoltaic (PV) distributed generators (DGs). In this paper, the PV generators were simulated consisting of a buck-boost DC/DC converter and single phase DC/AC inverter. It was connected to the distribution line through the low voltage 220 volt 50 Hz. The proposed phase balancing system uses battery energy storage and three single phase bidirectional inverters. The inverter is capable of injecting current or absorbing power from the line to the battery. This inverter operation is arranged to balance each distribution line separately, as well as to improve other power quality parameters, such as voltage and current harmonics. Simulation results show that the system was capable of improving the unbalanced line current from 15.59 % to 11, 48 % and unbalanced line voltage from 1.76 % to 0.58 %. The system was able for increasing current harmonics from 0.98 % to 1.03% and voltage harmonics from 38.96% to 39.08%.

Study on Protection Scheme for Low-voltage Distribution Network with Distributed Generation

2013 ◽  
Vol 12 (16) ◽  
pp. 3655-3659 ◽  
Author(s):  
Zhu Xueling ◽  
Zhou Ning ◽  
Han Fei ◽  
Li Qiang ◽  
Li Daokuan
Keyword(s):  
Distributed Generation ◽  
Low Voltage ◽  
Distribution Network ◽  
Voltage Distribution ◽  
Protection Scheme

scholarly journals On the Conflict between LVRT and Line Protection in LV Distribution Systems with PVs: A Current-Limitation-Based Solution

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2909 ◽  
Author(s):  
Aristotelis Tsimtsios ◽  
Dionisis Voglitsis ◽  
Ioannis Perpinias ◽  
Christos Korkas ◽  
Nick Papanikolaou
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Low Voltage ◽  
Energy Resource ◽  
Distribution Networks ◽  
Voltage Distribution ◽  
Current Limitation ◽  
Protection Scheme ◽  
Low Voltage Ride Through ◽  
Photovoltaic Generators

The upcoming adoption of low-voltage-ride-through requirements in low-voltage distribution systems is expected to raise significant challenges in the operation of grid-tied inverters. Typically, these inverters interconnect photovoltaic units, which are the predominant distributed energy resource in low-voltage distribution networks, under an umbrella of standards and protection schemes. As such, a challenging issue that should be considered in low-voltage distribution network applications, regards the coordination between the line protection scheme (typically consisting of a non-settable fuse) and the low-voltage-ride-through operation of photovoltaic generators. During a fault, the fuse protecting a low-voltage feeder may melt, letting the generator to continue its ride-through operation. Considering that the efficacy/speed of the anti-islanding detection is affected by ride-through requirements, this situation can lead to protracted energization of the isolated feeder after fuse melting (unintentional islanding). To address this issue, this paper proposes a fault-current-limitation based solution, which does not require any modification in the existing protection scheme. The operation principles, design, and implementation of this solution are presented, while, its effectiveness is supported by extensive simulations in a test-case low-voltage distribution system. A discussion on the presented results concludes the paper.

scholarly journals Equivalent model of multi-type distributed generators under faults with fast-iterative calculation method based on improved PSO algorithm

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Puyu Wang ◽  
Jinyuan Song ◽  
Fangyu Liang ◽  
Fang Shi ◽  
Xiangping Kong ◽  
...  
Keyword(s):  
Calculation Method ◽  
Low Voltage ◽  
Distribution Network ◽  
Pso Algorithm ◽  
Equivalent Model ◽  
Synchronous Generators ◽  
Fault Calculation ◽  
Distributed Generators ◽  
Current Characteristics ◽  
Integration Strategies

AbstractThere are various types of distributed generators (DGs) with different grid integration strategies. The transient characteristics of the fault currents provided by the DGs are different to those of conventional synchronous generators. In this paper, a distribution network with multi-type DGs is investigated, including consideration of DG low-voltage ride through (LVRT). The fault current characteristics of two typical DGs, i.e. an inverter-interfaced distributed generator (IIDG) and a doubly-fed induction generator (DFIG), are analyzed, considering the specific operation modes. Based on analysis of the fault characteristics, an equivalent model of the multi-type DGs under symmetrical/asymmetrical fault conditions is established. A fast-iterative fault calculation method for enhancing the calculation efficiency while avoiding local convergence is then proposed using an improved particle swarm optimization (PSO) algorithm. A simulation system of the distribution network with multi-type DGs is established in PSCAD/EMTDC. The simulation results validate the high accuracy and calculation efficiency of the proposed calculation method of the fault components. This can assist in the settings of the protection threshold.

scholarly journals Design of a Microgrid with Low-Voltage Ride-Through Capability and Simulation Experiment

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Wenchao Fan ◽  
Zaijun Wu ◽  
Xiaobo Dou ◽  
Minqiang Hu ◽  
Jieru Wei ◽  
...  
Keyword(s):  
Low Voltage ◽  
Distribution Network ◽  
Fault Recovery ◽  
Voltage Distribution ◽  
Distribution Grid ◽  
Distributed Generations ◽  
Low Voltage Ride Through ◽  
Ground Fault ◽  
Islanded Mode ◽  
Network Fault

A microgrid with low-voltage ride-through capability is designed. The designed microgrid avoids operating in unplanned islanded mode during an asymmetric ground fault which occurs in the low voltage distribution network and supports fault recovery for distribution network. Furthermore, compared with the traditional microgrid topology, the proposed microgrid topology also saves a lot of power electronic devices. The simulation results with PSCAD/EMTDC show that the microgrid can keep the distributed generations and loads operate normally when an asymmetric ground fault occurs in the low voltage distribution grid. It can also increase the active power output according to the requirement of the distribution network to support the distribution network fault recovery.

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