The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In recent year Distributed generation (DG) has become a point of interest in many countries due to several advantages such as improvement in power reliability, reduction of loss in transmission system, improved efficiency in network and lower environment impact. With this much benefit many networks working on integrate renewable energy source DG to the grid connection. Although it has many advantages,...
When wind blows through a wind farm with multiple rows of wind turbines, the wind speed on a downstream wind turbine is usually lower than that on an upstream wind turbine. This phenomenon is called wake effect. During the design stage of a wind farm, the study of wake effects will affect the most suitable location of each wind turbine. The major factors influencing the wake losses include the incoming...
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...
Al Ain Distribution Company (AADC), UAE, a subsidiary of the ADWEA distributes power and water to Al Ain, covering an area of 12000sq.km, with peak electrical load over 2000 MW in 2014.
This paper deals with control of a linear magnetic-geared permanent-magnet generator for wave power generation using maximum power point tracking (MPPT) algorithm. Firstly, the linear magnetic-geared permanent-magnet generator structure is presented. The machine modeling is established based on the finite element analysis (FEA). Secondly, by analyzing the dynamic model of the wave power, the MPPT...
The main work during the initial stage of power system restoration is to restart the generators. At present, searching the optimal recovery path is mainly based on the objective of restoring the whole system. Considering that the DC converter station is able to supply large amounts of power generation, it can accelerate the restoration, if the DC converter station is restarted preferentially. However,...
Microgrid cluster is a multi-microgrid system containing cluster-level control. Compared to single microgrid, whether microgrid cluster is able to improve the reliability effectively is a crucial problem in the developing process of microgrid technology, which is thoroughly analyzed in this paper. Topology of a typical microgrid cluster is presented first. Because the reliability of microgrid cluster...
In recent years, the development of offshore wind farms has increasingly become larger in scale. The integration of large-scale wind farms increases the potential risk to the stable operation of power grids. One of the challenges comes from the possible switching overvoltage of the power system in offshore wind farms because insulation accidents caused by overvoltage have become one of the prominent...
Distributed control can be applied to a virtual power plant (VPP) to allocate electrical power among distributed generators (DGs). By using consensus algorithm and selecting the incremental cost of each DG as the consensus variable, economic dispatch of the VPP can be realized in a distributed manner. Therefore, only local communication among DGs is required and some performance limitations caused...
In this paper, limitations of the online DSA based on the real-time data are analyzed. And thus three kinds of DSA application modes are proposed including real-time analysis mode, intervention analysis mode and trend analysis mode. Concrete research purpose, source data and processing flow of proposed application modes are expounded respectively. Overall work flow of on-line DSA involved proposed...
Control of three-phase grid-connected voltage source converter under unbalanced grid faults greatly depends on the active and reactive powers processed by the converter. The instantaneous active power theory with sequence decomposition is employed to analyze the instantaneous power components, especially the second-order oscillation power. Study shows that the second-order oscillation power comprises...
With the quick development of the power grid in Guangdong Province, pumped storage power stations have been developing in large capacity form of grid energy storage in Guangdong Power Grid, for meeting the industrial load demand. The pumped storage power stations act as peaking plants and provide emergency response to sustain safe and reliable power supply in the network systems. Pumps and generators...
In this paper, an integration architecture for electric power big data (EPBD) is proposed. As the largest energy transmission system, power system features huge data volume, which is also one of the characteristics of big data. Generally, big data integration pattern includes data federation and data warehouse. Due to the requirements of high reliability, instantaneity and security for power system,...
The purpose of this paper is to study the effect of distributed generator (DG), which is solar photovoltaics (PV) integrated into the distribution system of Provincial Electricity Authority (PEA) in terms of cost, Feed-in Tariff (FiT) and reliability. The distributed generator (DG) under this study is connected to a 22 kV distribution system of Thanyaburi substation on the PEA, which is a part of...
In an islanded microgrid, the reactive power needed to support the voltage regulation could not be shared among distributed generators (DGs) accurately when those conventional droop control scheme is imposed, due to the effects of mismatched feeder impedance of DGs parallel operation. Meanwhile, the conventional droop control scheme can not achieve satisfied voltage recovery performance at the point...
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...
This paper presents a novel control strategy of the two-stage three-phase photovoltaic (PV) system based on the active and reactive power control to improve the low-voltage ride-through (LVRT) capability. With the help of the new strategy, the PV array can generate the appropriate active power according to the depth of the grid voltage dip to restrain the over-voltage and over-current. Simultaneously,...
It is known that Deterministic N-X criteria based power system planning can cause redundancy when satisfying reliability requirement. Instead, the probabilistic reliability criterion are a trade-off option between reliability and economy. Nevertheless, the combination of economy and reliability indices is difficult to be handled and there are no effective methods existing in current literature. In...
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...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.