Showing papers by "Pei Zhang published in 2018"
TL;DR: In this article, a hierarchical decoupling optimization framework for both the energy hub optimal dispatch and the optimal power flow problems is proposed to make the OLC calculation more efficient and accurate, and a reduction technique of higher order contingencies is presented for the reliability evaluation of IESs to further enhance the computational efficiency.
102 citations
TL;DR: A novel incremental reliability assessment approach (IRAA) for TEP is proposed, which can be used to improve the performance of various traditional reliability assessment methods and has superior performance to traditional methods in terms of accuracy and efficiency.
Abstract: Reliability assessment is of great importance to transmission expansion planning (TEP). In this paper, a novel incremental reliability assessment approach (IRAA) for TEP is proposed. The basic idea is to build an incremental reliability indices calculation model so as to quantitatively estimate the degree of reliability enhancement with high computational efficiency. First, contingencies are categorized into three scenarios according to the states of the added components of the planning schemes. Then, contribution of each scenario to the incremental reliability indices is analyzed in detail. It turns out that contingencies of only one scenario can affect the incremental reliability indices and, therefore, other contingencies can be eliminated. Based on this phenomenon, an IRAA is developed for TEP, which can be used to improve the performance of various traditional reliability assessment methods. Case studies are performed on IEEE RTS 24-bus and IEEE 300-bus test system. The results demonstrate that the IRAA has superior performance to traditional methods in terms of accuracy and efficiency.
24 citations
01 Nov 2018
TL;DR: In this paper, the impact of EI on the electricity industry is analyzed and four types of business models are proposed: distributed generation suppliers, customized service providers, energy platform operators and integrated energy service providers.
Abstract: As electricity industry reforms continue, utility companies will face more challenges. Meanwhile, the advent of Energy Internet Era brings new opportunities to utility companies. This paper first analyzes the impact of Energy Internet on electricity industry. Secondly, this paper investigates business models under Energy Internet era and proposes categorizing them into four types: distributed generation suppliers, customized service providers, energy platform operators and integrated energy service providers. Each business model is expounded by analyzing business cases. Finally, suggestions on how to choose the right business model are given based on the characteristics of different companies.
6 citations
19 Jul 2018
TL;DR: Comparison study results show that the proposed strategy for the power system in Chongqing, China uses less time than the present strategy, which is helpful for enhancing the system reliability and reducing the loss.
Abstract: This paper applies the community detection theory and greedy algorithm to develop a practical parallel restoration strategy for the power system in Chongqing, China. The system is first partitioned by a modified label propagation algorithm considering the system topology and operation before a blackout. With the purpose of the shortest restoration time, all subsystems are restored simultaneously and independently by the greedy algorithm. Comparison study results show that the proposed strategy uses less time than the present strategy. It is helpful for enhancing the system reliability and reducing the loss.
3 citations
01 Nov 2018
TL;DR: A case study using the compatibility assessment between the United States and Canada indicates that the two countries are suitable for grid interconnections and the methodology promoted previously can be used in compatibility assessment of transnational grid inter connections.
Abstract: Transnational grid interconnections are conducive to promoting optimal allocation of resource, reducing generation costs, balancing system load, and reducing system backup capacity. It is necessary to assess compatibility between collaborating countries in order to evaluate feasibility of transnational grid interconnections. Our previous research investigated compatibility assessment methodology in terms of political, social, economic and environmental aspects. This paper performs a case study using the compatibility assessment between the United States and Canada. The evaluation result indicates that the two countries are suitable for grid interconnections. The actual situation of the interconnection between the United States and Canada confirms that the evaluation result is reasonable. Therefore, the methodology promoted previously can be used in compatibility assessment of transnational grid interconnections.
2 citations
01 Nov 2018
TL;DR: This paper compares two attribute selection methods: participation factor method and Relief-F algorithm, which are based on modal analysis of Jacobi matrix and a mathematical approach that does not require power system knowledge.
Abstract: Decision tree (DT) as an effective data mining method has been widely used in voltage stability assessment. The selection of decision tree’s input attributes is critical because input attributes affect the accuracy and efficiency of the decision tree. This paper compares two attribute selection methods: participation factor method and Relief-F algorithm. Participation factor method is based on modal analysis of Jacobi matrix, while Relief-F algorithm is a mathematical approach that does not require power system knowledge. Two DTs with the same number of input attributes identified by participation factor analysis and Relief-F algorithm respectively are constructed for comparison in term of accuracy and efficiency. A case study on a practical power system indicates that two methods identify similar attributes and the accuracy of two DTs are close.
1 citations
01 Nov 2018
TL;DR: Based on model comparison, a data conversion program has been developed to convert data from BPA to NETOMAC and there exists slight difference between NETomAC and BPA in terms of transient simulation.
Abstract: PSS/NETOMAC is an advanced electromagnetic and electromechanical transient analysis tool. In order to convert power grid data from PSD-BPA to PSS/NETOMAC, this paper first compares the power flow and transient analysis mathematical models between PSD-BPA and PSS/NETOMAC. The power flow models include AC buses, transmission lines and transformers. The transient analysis models include synchronous generator, excitation systems, power system stabilizers (PSS) and governor systems. Based on model comparison, a data conversion program has been developed to convert data from BPA to NETOMAC. Two test systems are used to verify the data conversion. NETOMAC and BPA can achieve the same power flow computation results. In terms of transient simulation, there exists slight difference between NETOMAC and BPA.
1 citations
TL;DR: In this paper, the authors proposed a new economic benefit evaluation model which is quantified by using a chronological production cost simulation approach, which comprehensively considered investment costs and the benefits of the decrease of load payments and the increase of net generation revenue due to a transmission project interconnected with different countries.
Abstract: Multinational power grid interconnections play a critical part in supporting the vision of global energy internet. During the early stages of the Global Energy Internet, the value proposition of multinational interconnections should be carefully investigated in order to stimulate the activities for associated countries in such potential interconnections. This paper proposes a new e conomic benefit evaluation model which is quantified by using a chronological production cost simulation approach. The economic benefit model comprehensively considered investment costs and the benefits of the decrease of load payments and the increase of net generation revenue due to a transmission project interconnected with different countries. This economic benefit model can assist to quantitatively determine the optimal transmission capacity for multinational interconnections to achieve maximum economic benefits as a whole. In the case study, the economic benefit of an interconnected system of western China and the Gulf States is assessed by using the method proposed in this paper. And the optimal interconnection capacity with maximum benefit is achieved. The case study shows that the proposed method can be used for economic benefit assessment and is of great significance to the multinational and inter-continental transmission interconnections.
1 citations
01 Nov 2018
TL;DR: The proposed compatibility assessment can effectively identify opportunities, evaluate the feasibility of transnational interconnections between countries and promote accomplishing the vision of Global Energy Interconnections.
Abstract: This paper proposes a novel method to assess the compatibility of transnational grid interconnections, including political, social, economic and environmental aspects. Compatibility refers to the degree to which two countries are suitable for grid interconnections. The paper analyzes each influential factor and proposes a set of compatibility indices to quantitively evaluate the compatibility of grid interconnections of multiple countries. A scoring-based method is proposed in this paper for comprehensive compatibility assessment, in which the weighting factors and scoring criteria are developed. The proposed compatibility assessment can effectively identify opportunities, evaluate the feasibility of transnational interconnections between countries and promote accomplishing the vision of Global Energy Interconnections.