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This paper is dedicated to analyze the economic issues related to the operation of microgrid system as well as exploring its benefits in improving reliability, energy saving and consumption reduction, environmental protection, investment deferral in transmission and distribution grids from the social perspective. It analyzes its cost and benefits in typical situations by the 2 typical cases of grid-connected...
Integrating a wind farm with a battery energy storage system (BESS) could improve the intermittence and randomness of the output power of the wind farm, and hence reduce the negative impacts on the security and economics of the power system concerned. Given this background, an improved control strategy is first proposed with the interactions between the current charging/discharging status of BESS...
SCADA (Supervisory Control And Data Acquisition) system is a basic infrastructure of modern power systems. SCADA data are widely used in applications such as state estimation, power flow calculation, and on-line security assessment. The accuracy of the SCADA data directly affects the implementation of power system automatic control. In practice, the error of the SCADA data may deviate from its factory...
Unstable equilibrium point (UEP) and dynamic saddle point (DSP) are completely different concepts in the power system transient stability analysis. However, some research still hold the view that UEP accurately reflects the power system transient stability and try to define and find the so-called related UEP. In this paper, the differences and correlations between UEP and DSP in reflecting system...
This paper discusses the framework and function of the integrated supervision and control system in a 220kV smart substation. Researching based on the device configuration schemes and network structures of the integration system have been carried out. An optimization design and feasibility analysis are proposed, which results to the capital cost of the substation reduction, the reliability of operation...
The Hongkong Electric Co., Ltd. (HK Electric) is one of the longest-established power companies in the world supplying electricity mainly to Hong Kong Island since incorporated in 1889. Hong Kong is not only an international city but a densely populated area featuring numerous high rise buildings where commercial and financial activities keep operating almost round the clock. Even a short interruption...
Black Point Power Station (BPPS) is Hong Kong's first natural gas-fired power plant, consisting of eight 312.5MW single-shaft combined-cycle units. The first six units C1–C6 were progressively commissioned in 1996–1998 while the last two units C7–C8 came into operation in 2005 and 2006 respectively. Each generator is independently connected to a 420MVA generator transformer converting the 23kV generator...
the flexibility and reduced harmonics have made Modular Multilevel Converters (MMC) a popular candidate in FACTS (Flexible AC Technology) applications in network reinforcement. However, few publications so far address the inherent problems such as voltage imbalance across each arm. Voltage balancing control is an essential element in safeguarding the device reliability and power quality by reducing...
Microgrid has effectively mitigated the effect of distributed generation on power grid, thus boasting excellent development potential. This paper discusses the comprehensive benefits of microgrid in improving reliability, energy saving and consumption reduction, environmental protection, investment deferral in transmission and distribution grids from the social perspective. It analyzes the cost composition...
Based on equivalent model of power network and voltage stability index, a coordinated voltage stability control scheme is developed in this paper. According to the relationship between power transfer capability and grid-side voltage source potential of two node power system, power network equivalent model is used to study on voltage stability control, and it is proposed that the control function is...
In order to realize more efficient electricity supply system, smart grid technologies, which are driven by the collaboration between power system technology and information and communication technology, are indispensable. One of these technologies is the smart metering infrastructure, which play a big role especially in the field of retail supply and distribution network modernization. This paper...
Failures of the standby power systems in many applications are well documented and it can lead to premature system shutdown leading to lengthy delays in industrial applications or in Railway applications endangering lives. After such incidents the failures are typically attributed to either poor maintenance or in a lot of cases the design errors. This article explore the latter and highlights the...
The harmonics produced by the voltage source converters (VSCs) will be a challengeable power quality problem in modern power system. The digital simulation is an important approach to analyze the harmonic problems of the power electronic devices. The time step of simulation is the key point which affects the accuracy of the harmonic analysis of discrete signals in the digital simulations. This paper...
The introduction of life cycle management (LCM) into power system asset management is very helpful for maintaining the secure and economic operation of the power system concerned, reducing the life cycle cost (LCC) and improving the management of electric power assets. Given this background, a brief survey is first made on the state-of-the-art of LCM in power system asset management, including cost...
This paper presents the recent status of offshore wind energy and HVDC transmission from it in Japan. In 2015, NEDO (New Energy and Industrial Technology Development Organization) in Japan launched the new project for the HVDC transmission from the offshore wind-farm. This project aims system integration to reduce the cost and increase the performance. This paper shows some aspects of the new development...
Due to the high risk of cascading failures, an online solution for N-2 failure control becomes increasingly important. Dual short-circuit fault, as one of the simplest N-2 failure, was studied in this article. Some explorations were made aiming at the composition rules of critical cluster (CC) and the relationship between the dual short-circuit fault's conservative control quantity and the individual...
With rapid growth of installed wind power capacity worldwide and significant development of wind turbine generator (WTG) technologies, WTGs gradually have capability to participate in system frequency regulation. To this regard, the typical WTG frequency control strategies, such as inertial emulation, de-loading control, over-production and droop control are investigated in detail to reflect the development...
The increased penetration of wind power generation has introduced significant uncertainty and complexity to power system operations, making the real-time dynamic security assessment (DSA) a necessity to protect the system against the risk of blackouts. As a promising strategy for real-time DSA, the intelligent system (IS)-based approach extracts the DSA knowledge from a dynamic security knowledgebase...
With the rapid development of smart grid and information technology, Energy Internet has been attracting increasing attention from government as well industry. Some landmark proposals in development of Energy Internet concept are reviewed and some basic features have been discussed. These include physical connection, protocol design, safety rules and the most important one, energy router design. Within...
A blackout usually starts with the failure of electrical power equipment, especially transmission lines. However, the fault probability of a transmission line is often assumed to have a specific value in the existing risk analysis, regardless of the complicated conditions and effectiveness. In this paper, we first decompose the transmission line risk sources into six components: line swaying, thunderstorms,...
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