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Flexible Interconnection Control Technology of Power Distribution Networks
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Flexible Interconnection Control Technology of Power Distribution Networks

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F2: Distributed Energy System".

Deadline for manuscript submissions: closed (18 October 2023) | Viewed by 7770

Special Issue Editors

Dr. Jingyuan Yin

E-Mail Website
Guest Editor
1. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Interests: flexible HVDC transmission technology; distributed power generation and energy storage technology; DC power grid key equipment technology
Special Issues, Collections and Topics in MDPI journals
Dr. Qunhai Huo

E-Mail Website
Guest Editor
1. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Interests: flexible HVDC transmission technology; distributed power generation and energy storage technology; DC power grid key equipment technology

Special Issue Information

Dear Colleagues,

With the large-scale access of new energy and new loads, the power distribution network has been transformed into a new energy internet system with multiple functions, such as power collection, transmission, storage, and distribution. The traditional and new problems of the distribution network have become increasingly prominent, and effective means are urgently needed to alleviate them. The construction of new power systems with new energy as the main body improves our approaches to meeting the requirements of the power grid for the acceptance of renewable energy. At the same time, a large number of traditional non-electric loads on the distribution side need to be replaced by electric loads. The combined action of these factors intensifies the difficulty of source load matching on the distribution side. In recent years, flexible power distribution equipment and system operation control technology with power electronics as the core have attracted extensive attention. Several differentiated operation scenarios and demonstration projects based on related technologies reflect the value and significance of flexible interconnection. The flexible interconnection equipment of distribution networks provides them with strong power flow control and regulation ability, which can effectively realize load transfer, promote feeder load balancing, and provide distributed power consumption ability. At the same time, considering cooperation with the energy storage system, flexible interconnection of distribution networks can not only provide the power flow “redistribution” ability on a spatial scale but also further solve the imbalance of energy supply and demand on a time scale.

Dr. Jingyuan Yin
Dr. Qunhai Huo
Guest Editors

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Keywords

  • flexible interconnection
  • control strategy
  • new topologies
  • coordinated planning technique
  • application in new scenarios

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Published Papers (4 papers)

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Research

19 pages, 6035 KiB  
Article
Probabilistic Power Flow Method for Hybrid AC/DC Grids Considering Correlation among Uncertainty Variables
by Xiaotian Xia and Liye Xiao
Energies 2023, 16(6), 2547; https://doi.org/10.3390/en16062547 - 8 Mar 2023
Cited by 3 | Viewed by 1470
Abstract
For a new power system using high-penetration renewable energy, the traditional deterministic power flow analysis method cannot accurately represent the stochastic characteristics of each state variable. The aggregation of renewable energy with different meteorological characteristics in the AC/DC interconnected grid significantly increases the [...] Read more.
For a new power system using high-penetration renewable energy, the traditional deterministic power flow analysis method cannot accurately represent the stochastic characteristics of each state variable. The aggregation of renewable energy with different meteorological characteristics in the AC/DC interconnected grid significantly increases the difficulty of establishing a steady-state model. Therefore, this study proposes an improved Latin hypercube sampling algorithm using the van der Waerden scores and diffusion kernel density estimation to overcome the limitations of a priori assumption on probability distributions in uncertainty modeling and to retain the correlations among random variables in the sampling data. Interconnected grids are constructed with IEEE 9-bus and IEEE 14-bus and modified with IEEE 57-bus to describe common application cases of aggregated renewable energy. On this basis, the approximation errors of the proposed probabilistic power flow algorithm to the statistical characteristics of the power parameters are evaluated by setting the Nataf algorithm and the Latin hypercube algorithm using adaptive kernel density estimation as the control group. The results show that the improved Latin hypercube sampling algorithm can exhibit high computational accuracy and strong adaptability, both in severe operating scenarios with large amplitude of load fluctuations and with nonlinear power balance equations incorporating high dimensional random variables. Full article
(This article belongs to the Special Issue Flexible Interconnection Control Technology of Power Distribution Networks)
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16 pages, 3948 KiB  
Article
A Multiple Time Scales Rolling Coordinative Dispatching Method for an Island Microgrid with High Proportion Tidal Current Energy Access and Demand Response Resources
by Yani Ouyang, Wei Zhao, Haifeng Wang and Wenyong Wang
Energies 2022, 15(19), 7292; https://doi.org/10.3390/en15197292 - 4 Oct 2022
Cited by 2 | Viewed by 1616
Abstract
Currently, the ocean energy strategy is rapidly developing, and a high proportionate tidal current energy grid connection presents significant obstacles to the planning and secure and stable operation of an island microgrid. For an island microgrid with high proportion tidal current energy access [...] Read more.
Currently, the ocean energy strategy is rapidly developing, and a high proportionate tidal current energy grid connection presents significant obstacles to the planning and secure and stable operation of an island microgrid. For an island microgrid with high proportion tidal current energy access and demand response resources, this research suggests a multiple time scales rolling coordinative dispatching method. An MPPT control based on Q-Learning algorithm is first developed for real-time maximum power tracking of tidal current energy generation after the island microgrid’s topology has been examined. Following that, a multiple time scales rolling coordinative dispatching’s fundamental architecture and implementation method are provided, with equal time intervals coordinated in a step-by-step recursive way. In the example analysis of an island microgrid, we consider the rigid demand load that does not participate in the demand side response, and the ship load and controllable load that participate in the demand side response. On sea islands, ship loads on the long timeframe achieve traffic and energy interaction, and dispatchable loads on the short timescale participate in supply and demand balancing. This is due to the multiple time scales properties of demand response resources. In addition, a multiple time scales rolling coordinative dispatching model for an island microgrid is developed. It includes day-ahead, intraday, and real-time components. Finally, example analysis is used to confirm the dispatching method’s usefulness and advancement, and we conclude that the tidal current energy consumption rate of the island microgrid is increased by 17.08%. Full article
(This article belongs to the Special Issue Flexible Interconnection Control Technology of Power Distribution Networks)
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20 pages, 1282 KiB  
Article
Flexible Low-Carbon Optimal Dispatch of Honeycombed Active Distribution Network
by Feng Xu, Yi Lu, Qunhai Huo, Jingyuan Yin, Peng Qiu and Chao Ding
Energies 2022, 15(19), 7107; https://doi.org/10.3390/en15197107 - 27 Sep 2022
Cited by 7 | Viewed by 1563
Abstract
Microgrids have a strong ability to generate local power and consume renewable energy, which can solve the problems of power supply shortages and greenhouse gas emissions created in the process of social development. The honeycombed active distribution network (HADN) can flexibly, independently, and [...] Read more.
Microgrids have a strong ability to generate local power and consume renewable energy, which can solve the problems of power supply shortages and greenhouse gas emissions created in the process of social development. The honeycombed active distribution network (HADN) can flexibly, independently, and interconnectedly operate microgrids through power exchange stations, so appropriate HADN dispatch can produce increased low-carbon benefits than general microgrids. In this study, we first designed a model for optimizing HADN with the lowest carbon emission as the target, then we introduced the concept of carbon emission flow into the optimization process to determine the carbon emission level of each element. Finally, we illustrated and verified the proposed model by a HADN composed of three microgrids. The optimization results of the case study showed that by scheduling the DGs within the microgrids, the total carbon emissions of the system were reduced from 123,328.1 to 117,688 kg CO2; the system with a HADN structure was able to produce only 110,958 kg CO2 and effectively reduce carbon emissions by 10%, which proved that HADN can be scheduled with high flexibility and provides increased low-carbon performance through the proposed optimization dispatch method. Full article
(This article belongs to the Special Issue Flexible Interconnection Control Technology of Power Distribution Networks)
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19 pages, 5355 KiB  
Article
Research on the Novel Flexible On-Load Voltage Regulator Transformer and Voltage Stability Analysis
by Libo Han, Jingyuan Yin, Lixin Wu, Longfei Sun and Tongzhen Wei
Energies 2022, 15(17), 6189; https://doi.org/10.3390/en15176189 - 25 Aug 2022
Cited by 3 | Viewed by 2316
Abstract
Voltage stability has always been a hot topic in power system research. Traditional On-Load Tap-Charger (OLTC) transformer is considered to play a very important role in the system voltage stability. However, in the heavy load of distribution network, the tap adjustment of OLTC [...] Read more.
Voltage stability has always been a hot topic in power system research. Traditional On-Load Tap-Charger (OLTC) transformer is considered to play a very important role in the system voltage stability. However, in the heavy load of distribution network, the tap adjustment of OLTC transformer will lead to the shift of critical stable operating point, which bring the “negative voltage regulating effect” of voltage adjustment, and even cause the instability of system voltage. This paper presents a Flexible On-Load Voltage Regulation (OLVR) transformer based on power electronic technology. The Flexible On-Load Voltage Regulation (OLVR) transformer is a combination of Power Electronic Converter (PEC) and OLTC transformer, which can realize voltage step-less regulation and reactive power regulation. Meanwhile, the paper presents the equivalent models of distribution network with Flexible OLVR transformer and analyzes the critical operating point. Through the step-less voltage regulation control of the Flexible OLVR transformer, the negative voltage regulation effect of the transformer in on-load voltage regulation is avoided, and the voltage stability of the distribution network is improved. Full article
(This article belongs to the Special Issue Flexible Interconnection Control Technology of Power Distribution Networks)
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