Power Grid Corporation Research Articles

Liberalization of Electricity Sales Side for Electricity Market-Oriented Transaction Mode

The market-oriented reform of the energy sales side is currently having a considerable impact, and in the economically developed regions, the electricity sales industry has evolved a competitive trend. Power grid corporations now compete in the market rather than serving as the traditional dominant force in electricity sales. After a new round of electrical reform, a key concern for the growth of firms is how to better integrate into the reform and increase their core competitiveness. The dangers associated with power market-oriented trading are examined in this study, and three risk mitigation strategies are suggested: the creation of a big data power trading platform, an information management system, and a blacklist system. The findings demonstrate that the optimal trading approach can successfully reduce the risk of variation in electricity assessments and generate significant revenue from electricity usage for power users. Additionally, we develop a multi-objective combination optimisation profit model and advise positioning and defences for businesses following the introduction of the power selling side.

State owned enterprises as multinational firms: the case of two power transmission firms in Canada and in India

ABSTRACT How do state owned enterprises behave when they have to perform as multinational firms? Do they respect their original mission or do they act like private multinational firms? The analysis of Hydro-Québec and Power Grid Corporation of India Limited, two companies transmitting electricity over the border and doing consultancy and investment in distant countries, shows the impact of share ownership and the nature of the top executives, as well as the role of the political environment and of the opportunities, taken or missed, in the process. The application of an analytical model reveals the complexity of such an unusual situation.

Financial Health of Indian Power Giants: A Comparative Analysis of Key Metrics and Stock Performance on Power Grid Corporation of India, NTPC, NHPC, TATA Power Ltd, Torrent Power Ltd

Financial Health of Indian Power Giants: A Comparative Analysis of Key Metrics and Stock Performance on Power Grid Corporation of India, NTPC, NHPC, TATA Power Ltd, Torrent Power Ltd

Power System Fault Detection and Analysis Using Numerical Relay in Power grid Corporation Limited, Shoolagiri

The faults in a power system may be of various nature and they may affect the stability of the power system by causing outage of the line, there by overloading other connected lines and also causing cascading effect in the system. In order to access the nature of fault and analyze the impact of the same in a power system, fault analysis is required to be carried out as the same will be useful for the system operation and to take quick decisions in securing the system. In this paper we discuss the various types of faults in EHV system that may occur in line or substation. These faults are identified by Numerical relays which use IEDs [Intelligent Electronic Device]. The faults identified includes symmetrical and unsymmetrical faults in power system. Further in this project, we have taken into consideration the theoretical and practical study of the fault analysis through Numerical relays. In case of occurrence of Transient faults, Auto re-closure works with dead time of 1 sec. Current, voltage, Breaker status (open, close) are graphically represented by Disturbance Recorder. Events are recorded by Event logger. The above mentioned project for faults and analysis of faults in line or substation were carried out at Power grid Corporation Limited, 400 / 230kv Sub-Station Shoolagiri.

Evaluation Method for Hosting Capacity of Rooftop Photovoltaic Considering Photovoltaic Potential in Distribution System

Regarding the existing evaluation methods for photovoltaic (PV) hosting capacity in the distribution system that do not consider the spatial distribution of rooftop photovoltaic potential and are difficult to apply on the actual large-scale distribution systems, this paper proposes a PV hosting capacity evaluation method based on the improved PSPNet, grid multi-source data, and the CRITIC method. Firstly, an improved PSPNet is used to efficiently abstract the rooftop in satellite map images and then estimate the rooftop PV potential of each distribution substation supply area. Considering the safety, economy, and flexibility of distribution system operation, we establish a multi-level PV hosting capacity evaluation system. Finally, based on the rooftop PV potential estimation of each distribution substation supply area, we combine the multi-source data of the grid digitalization system to carry out security verification and indicator calculation and convert the indicator calculation results of each scenario into a comprehensive score through the CRITIC method. We estimate the rooftop photovoltaic potential and evaluate the PV hosting capacity of an actual 10 kV distribution system in Shantou, China. The results show that the improved PSPNet solves the hole problem of the original model and obtains a close-to-realistic rooftop photovoltaic potential estimation value. In addition, the proposed method considering the photovoltaic potential in this paper can more accurately evaluate the rooftop PV hosting capacity of the distribution system compared with the traditional method, which provides data support for the power grid corporation to formulate a reasonable PV development and hosting capacity enhancement program.

A Real-Time Strand Breakage Detection Method for Power Line Inspection with UAVs

Power lines are critical infrastructure components in power grid systems. Strand breakage is a kind of serious defect of power lines that can directly impact the reliability and safety of power supply. Due to the slender morphology of power lines and the difficulty in acquiring sufficient sample data, strand breakage detection remains a challenging task. Moreover, power grid corporations prefer to detect these defects on-site during power line inspection using unmanned aerial vehicles (UAVs), rather than transmitting all of the inspection data to the central server for offline processing which causes sluggish response and huge communication burden. According to the above challenges and requirements, this paper proposes a novel method for detecting broken strands on power lines in images captured by UAVs. The method features a multi-stage light-weight pipeline that includes power line segmentation, power line local image patch cropping, and patch classification. A power line segmentation network is designed to segment power lines from the background; thus, local image patches can be cropped along the power lines which preserve the detailed features of power lines. Subsequently, the patch classification network recognizes broken strands in the image patches. Both the power line segmentation network and the patch classification network are designed to be light-weight, enabling efficient online processing. Since the power line segmentation network can be trained with normal power line images that are easy to obtain and the compact patch classification network can be trained with relatively few positive samples using a multi-task learning strategy, the proposed method is relatively data efficient. Experimental results show that, trained on limited sample data, the proposed method can achieve an F1-score of 0.8, which is superior to current state-of-the-art object detectors. The average inference speed on an embedded computer is about 11.5 images per second. Therefore, the proposed method offers a promising solution for conducting real-time on-site power line defect detection with computing sources carried by UAVs.

What affects the implementation of the renewable portfolio standard? An analysis of the four-party evolutionary game

The renewable portfolio standard (RPS) has become the primary policy tool to promote the transformation of the energy system. However, in the RPS implementation process, there are usually differences in the completion effects between provinces, so exploring the implementation influencing factors of RPS policy is significant. Given the diversity and complex interaction of subjects and strategies, we construct a four-party evolutionary game model including the central government (CG), local governments (LGs), power generation enterprises (PGEs), and power grid corporations (PGCs), and systematic analysis of the strategic behavior and main influencing factors. The results demonstrate that the CG, its strategy will change with the size of the incentive intensity. For LGs, its strategies are affected by factors such as regulatory costs, and unit fines, especially when the regulation cost is less than the penalty amount for the unfulfilled quota of PGCs; the LG is more inclined to choose strong regulation. For PGEs, the net income of different power generation forms will significantly impact the strategy of PGEs, and indirectly affect the strategy of LGs. For PGCs, increasing the incentive intensity, increasing the punishment of LG to PGCs, and reducing the operation cost of PGCs can help PGCs to complete the quota.

A Non-Iterative Fault Location Algorithm for Transposed/Untransposed Transmission Line Immune to Unsynchronized Measurements

This paper presents an impedance-based non-iterative fault location algorithm for a two-terminal line considering unsynchronized measurements to account for the loss of Global Positioning System (GPS) signal. Based on the availability of pre-fault signals two algorithms are proposed, one using pre-fault data and the other without using pre-fault data. The algorithms are formulated by using fundamental frequency phasor based decoupled modal components of the measured signals at both ends of the line while considering distributed line model. Application of decoupled modal components with distributed model enhances the accuracy of the presented algorithms in both transposed and untransposed configuration of the line. The proposed algorithms have been tested and analyzed with different fault conditions simulated in EMTP-RV platform. Comparative analysis with existing methods is also presented to establish prominent features of the proposed methods. The algorithms have also been tested with practical data of Power Grid Corporation of India Limited (PGCIL) and the test result validates the accuracy of the developed fault location algorithms.

Research on the Evaluation System of Scientific Research Ethics Based on AHP-Fuzzy Comprehensive Evaluation

Scientific research ethics is the value concept and code of conduct to be followed in scientific research, technological development and other scientific and technological activities. However, in recent years, some researchers have ignored ethical constraints in scientific research activities, resulting in more prominent ethical issues in scientific research. This study takes China Southern Power Grid Corporation as an example, based on ISO9000 standards, uses AHP-fuzzy comprehensive evaluation theory to establish a scientific research ethics evaluation system, aiming at improving the timeliness and targeting of scientific research ethics management.

Preface

The 2022 4th International Conference on Energy, Power and Grid (ICEPG 2022) will be held on September 23-25, 2022 in Guangzhou, China. ICEPG 2022 built a platform for academic resource sharing, expanded international scientific and technological academic exchange channels, promoted scientific and technological innovation on a global scale, and enhanced Sino-foreign academic cooperation.In the conference, we were greatly honored to have Prof. Jizhong Zhu from South China University of Technology, China to serve as our Conference Chair. 120 individuals around the world took part in the conference. Divided into two parts, the conference agenda included keynote speeches and oral presentations. Firstly, the keynote speakers were each allocated 30-45 minutes to address their speeches. Then in the oral presentations, the excellent papers we had selected were presented by their authors by turns.Six distinguished professors were invited to hold keynote speeches during the conference. Among them, Prof. Hong Rao, Academician of Chinese Academy of Engineering and Chief technical expert of China Southern Power Grid Corporation, performed a thought-provoking speech. He presided over the design and completion of 11 major DC projects including China’s ±500kV independent support project and the world’s first UHV multi-terminal flexible DC project, and established the State Key Laboratory of DC power Transmission Technology, making systematic contributions to China’s power grid technology innovation and the realization of international leadership in DC power transmission. Furthermore, Prof. Xiaoxin Zhou, Academician of Chinese Academy of Sciences and IEEE Fellow, made a report. He has been engaged in the research of mathematical models and methods for power system analysis for a long time, and proposed to use advanced machine cluster architecture and parallel algorithm of sub-network, and innovatively developed full digital real-time simulation device of high-performance power system (ADPSS), which has been promoted and applied at home and abroad. All the distinguished keynote speakers gave excellent presentations combining their own research areas and experiences. Their insightful speeches had triggered heated discussion and every participant praised this conference for disseminating useful and insightful knowledge.After months of hard work and preparation, we have selected a bunch of high-quality papers from the submissions and compiled them into the proceedings after rigorously reviewing them. These papers feature but are not limited to the following topics: Energy Saving Technology, Hybrid Energy Systems, Electromagnetics and Photonics, Electromagnetic and Applied Superconductivity, etc. All the papers have been checked through rigorous review and processes to meet the requirements of publication.We would like to acknowledge all of those who supported ICEPG 2022 and made it a great success. Particularly, we would like to acknowledge the Journal of Physics: Conference Series, for the endeavor of all its colleagues in publishing this paper volume. The help and contribution of each individual and institution was instrumental in the success of the conference.The Committee of ICEPG 2022List of Committee member is available in this Pdf.

Design and Experimental Investigations on the Helium Circulating Cooling System Operating at Around 20 K for a 300-kvar Class HTS Dynamic Synchronous Condenser

A project to develop a 10-Mvar high temperature-superconducting (HTS) dynamic synchronous condenser (DSC) is carried out by China Southern Power Grid Corporation. In order to cool the magnets to 20–30 K, a set of cryogenic system using circulating helium as the working fluid was developed, and it has been coupled and tested with the 300-kvar class dynamic synchronous condenser. Three cryogenic coolers are used as the cold source to provide more than 120 W@20 K cooling power. Cryogenic helium pump is employed to overcome a pressure drop of about 2.5 kPa induced by the helium gas circulating in the transfer tubes and heat exchangers. In the static tests coupled with the 300-kvar class dynamic synchronous condenser, the entire magnet was cooled to approximately 26.2 K by about 5 days. Once the rotor speeds up and reaches the design value of operation, the temperature rises slightly to about 26.6 K. Nowadays, the cooling system is upgrading and it will be served for the developed 10-Mvar DSC in the next year.

Investment Risk Assessment of EPC Power Transmission and Transformation Projects under New Energy Grid Connection Based on the Owner’s Perspective

Power transmission and transformation projects (PTTPs) under new energy grid connections are different from ordinary engineering construction projects. With large investment amounts, various supporting facilities, and high safety and quality requirements, PTTPs are vulnerable to the volatility of new energy power generation, climate, geological conditions, geopolitical environment, technological changes, and other kinds of uncertain factors. Therefore, the investment risk of PTTPs under new energy grid connection is particularly considerable in the project management. For the owner of PTTPs, adopting the engineering-procurement-construction (EPC) mode is an effective attempt to solve the project construction problems faced by the owners. Thus, this paper deeply excavates the key risk points of PTTPs in the initial investment phase under the EPC mode and constructs the novel risk evaluation index system from the perspectives of economy, management, policy, society, and environment. An assessment model is established based on triangle fuzzy number-hesitant fuzzy linguistic term sets (HFLTS-TFNs), the entropy method, and the fuzzy comprehensive evaluation method, which is used to evaluate the investment risk of PTTPs to provide reference for power grid corporations to control project risks. Finally, a case study in the Hexi Corridor region, Gansu Province, China, is illustrated to demonstrate the rationality of the decision model and find management risks are the most vital risk factors for PTTPs under EPC mode.

Optimization Mold and Algorithm of Risk Control for Power Grid Corporations Based on Collaborative Filtering Technology.

With the ever-changing internal and external environmental factors of enterprises, various uncertainties and risks faced by enterprises are increasing, and the feasibility of financial meltdown is increasing. Research on financial meltdown early warning can help enterprises to prevent the occurrence of peril in advance and take resultful measures to ensure the healthy development of enterprises. If a serious financial meltdown leads to the bankruptcy of enterprises, the financial meltdown is not sudden, but a gradual process. The occurrence of financial meltdown is not only a harbinger, but also predictable. Therefore, it is an urgent question to be solved for listed corporations in China that how to mine the message with early warning function from a large amount of financial data generated in the business process of enterprises. The continuous maturity of data mining technique just solves this question. Based on collaborative filtering technique, this paper analyzes the risk control optimization mold and algorithm of power grid corporations, which is of great signification. After research, this algorithm is 30% better than the traditional algorithm, and it is suitable to be proverbially used.

A Closed Form Solution for Line Parameter-Less Fault Location With Unsynchronized Measurements

This paper presents a novel two-terminal fault location algorithm without using line parameters. The algorithm is formulated using unsynchronized voltage and current phasors of the fundamental frequency at both ends. The novelty of the proposed method lies in the fact that it takes into account different angles of synchronism mismatch in pre-fault and fault conditions while considering distributed parameter line model and its solution is in closed form. Simulation results and performance comparison with existing methodology are presented under different fault conditions. The simulations were performed on EMTP-RV platform. The algorithm has also been tested with practical data of Power Grid Corporation of India Limited (PGCIL). The test result shows the validity and accuracy of the developed fault location algorithm.

Economical Setting-Free Double-Ended Fault Locator for Transmission Lines: Experiences From Recent Pilot Installations

Locating fault precisely on power transmission line is highly beneficial to utilities and accurate fault location can expedite the repair of the faulted components, speed-up restoration, and reduce outage time. In this paper, a setting-free double ended fault location method for power transmission line is proposed using both end voltage and current measurements. This algorithm estimates the required setting parameters using pre-fault data and fault location is calculated using estimated parameters and during fault data. The proposed method is verified using the EMTDC simulations for lines connected with conventional and inverter-based renewable resources. The method is not affected by the error in line parameters and renewable integration. The method is implemented in Intelligent Electronic Device (IED) using 1kHz sampling rate and successfully installed on a 400 kV, 233.07 km line from Power Grid Corporation of India (POWERGRID), India and on a 220 kV, 265.6 km line from Svenska Kraftnat (SVK), Sweden. This paper presents laboratory test results as well as field experimental results in which line patrolling crews found the actual location. Pilot installation results match the performance demonstrated with laboratory experimental results. The method gives average fault location error of ~ 0.1 %. The method can locate the fault within two-tower span distance (~300m) which is comparable with traveling wave-based method that requires 1000 times higher sampling rate, high-cost hardware, more complex commissioning, and settings. These geographically diverse pilot installation results stand as testimony to the fault location accuracy of the proposed setting-free fault location solution.

Construction of energy internet technology architecture based on general system structure theory

Based on electrical power systems, leveraging renewable energy generation technology, and information technology, the energy internet fuses power grids, gas networks, heat/cold supply networks, electric transportation networks, etc. into an interconnected energy sharing network. The energy internet is an important technology for promoting renewable energy integration and improving energy efficiency. However, due to the complexity of multiple energy networks and the significant differences between them, the planning, operation, and control of energy internet presents several technical difficulties. Mainstream research only divides the complex system of energy internet into three systems: energy grid system, value creation system, and information support system. Under each system, how the State Grid Corporation of China develops related technologies has not been detailed, and the technical system framework composed of internal logical connection of each technical point is not yet mature. Based on general system structure theory, the technical system framework for the provincial power grid corporations to construct regional energy internet is constructed, and it proposes a technical route for the development of provincial energy internet based on local conditions in this paper. It can guide different affiliated companies in the field of energy internet technology that should be focused on research, and support the development of related technologies.

The impact of the recession on the liquidity and activity ratios of top power transmission company: case of power grid corporation of India Ltd.

The impact of the recession on the liquidity and activity ratios of top power transmission company: case of power grid corporation of India Ltd.

Research on the Coordinated and Sustainable Development of Jiangsu Power Grid under the “Double Carbon” Goal

Under the “double carbon” goal, renewable energy power generation will become the mainstream power generation in the future. The offshore Jiangsu Province has relatively abundant renewable resources, and it also creates favorable conditions for Jiangsu Power Grid Corporation to invest in renewable energy power generation business in the future. The new round of power system reform has had a profound impact on the determination of the investment scale of power grid companies and the optimization of the investment structure. This article first sets the future power supervision scenarios, and then measures the investment capacity and investment needs of power grid companies under different scenarios, determines the investment scale, conducts a coordinated analysis of investment capabilities and investment needs, matches investment capabilities and investment needs, and satisfies investment Under the premise of demand, improve investment efficiency, and finally realize the coordinated and sustainable development of Jiangsu Power Grid investment.

Development and Testing of a 300-kvar HTS Synchronous Condenser Prototype

China Southern Power Grid Corporation started a project to develop a 10-Mvar high-temperature superconducting (HTS) dynamic synchronous condenser (DSC). As the first stage of the project, a 300-kvar HTS DSC prototype was developed to verify some key technologies, such as HTS rotor magnets, helium gas circulating cooling and rotating signal acquisition. In this prototype, conduction-cooled REBCO coils were installed in the rotor and air-core copper windings were used in the stator. Cold helium gas at around 20 K was used as the coolant circulating between the rotor and the external cryogenic unit through a cryogenic rotary coupling. The REBCO coils were conduction cooled by distributed helium-gas tubes embedded in the cover plates of the coils. The rotor magnet was successfully charged up to 200 A under both static and rotating conditions. For the requirement of an HTS DSC, rapid excitation tests from 170 A to 200 A were carried out at both 500 rpm and 1500 rpm.

A Novel Non-Iterative Fault Location Algorithm for Transmission Line With Unsynchronized Terminal

This letter presents a novel non-iterative impedance based two-terminal fault location algorithm with unsynchronized terminals. The novelty of this method lies in the fact that it is non-iterative, does not require signal alignment, are independent of fault classification, suitable for both transposed and untransposed lines with distributed line model. Several results of simulations on standard and practical data of Power Grid Corporation of India Limited (PGCIL) are presented. The test results verifies the validity and accuracy of the developed fault location algorithm.