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.
The distribution system is demanded to be more efficient, more flexible and more intelligent due to the continued growth of the electricity loads, the high efficiency of energy utilization and the environmental protection. The traditional distribution systems are facing the challenge of evolving from passive networks to the active distribution networks (ADN) with the integration of multiple controllable...
This paper presents comprehensive quantification indices to evaluate the influences of distributed generation (DG) integration on distribution network from three aspects, which involve voltage quality, economics and hosting capacity. Based on the modified IEEE 13-nodes test system, the time-series power flow analysis of DG integration is carried out for duration of one day. The proposed indices are...
As the penetration of intermittent distributed generation (DG) in active distribution network (ADN) growing fast, bus over or under voltage problems in ADN will be more frequently. This paper presents a novel autonomic voltage coordination control in ADN based on model predictive control (MPC). With the optimal coordinated control strategy for solving these voltage problems, this control method takes...
A Volt-VAR control (VVC) strategy by using voltage regulators and reactive power compensators in the modern distribution grid for renewable energy integration is presented in this paper. Currently, the VVC techniques are gaining renewed interest and attention due to the emergence of active distribution grid, which refers to the distribution grid with advanced capability of computation, control and...
Active Distribution Network (ADN) has been considered as an efficient way to integrate high penetration of distributed energy within distribution electrical systems. The current challenge of operating an ADN is lack of an appropriate energy management system (EMS) for system operators. In this paper, we propose the framework design of EMS of ADN based on some specific ADN technical requirements, such...
In order to improve the calculation accuracy and speed of distribution networks state estimation, this paper presents a robust algorithm of three-phase state estimation for distribution networks based on residual prediction. All kinds of measurements in distribution networks are used in the algorithm, jacobian matrix becomes constant though phase transform of node voltage and branch current, and equivalent...
Distributed Generation ( DG ) using renewable energy to generate power in distribution networks is influenced by natural conditions, and its output power is fluctuant, affecting whole system operation. According to load voltage characteristics and features of DG, this paper presents a method of coordinated control of load and distributed generation based on Volt-Var control, and analyzes the effectiveness...
Grid-connected inverters are the interfaces for renewable energy sources into the active distribution networks. Usually typical grid-connected inverters use pulse width modulation control, resulting in the grid currents contain a lot of high-order harmonics. Traditionally, grid-connected inverters use L filter to eliminate the harmonics. And in grid-connected inverters' AC side, it uses LCL filter...
Three-phase detailed model of transformer plays a critical role in calculation and analysis for multi-voltage level distribution networks, its accuracy is directly related to the reasonableness of results. This paper presents a universal three-phase detailed model of transformer, which is derived with symmetric phasor method according to winding wiring and phase-shifting angle, and has general versatility...
The load of air conditioner has taken a significant percentage of whole social load. The paper firstly constructed a four-node electrical circuit to model the thermal behaviour of a building. And the four-node electrical circuit model was verified by a professional commercial software. Then the loads of heating and cooling systems installing on buildings with different thermal integrity levels were...
Although maximum power point tracking (MPPT) is crucial in the design of a wind power generation system, the necessary control strategies should also be considered for conditions that require a power reduction, called de-loading in this paper. A coordinated control scheme for a proposed current source converter (CSC) based DC wind energy conversion system is presented in this paper. This scheme combines...
As the Smart Grid develops, demand response plays an important role for both consumers and the utility. Proper price signal can result in conspicuous peak shifting. This paper analyses changes of load behavior under different price scenarios, and how demand response smooths out fluctuations of distributed generation (DG). This study demonstrates the performance of demand response, which contributes...
There is an increasing concern about encouraging customer loads to provide demand response to help discipline electricity markets and improve economic efficiency. The implementation of demand response increases the extent of users' participation. Thus proper price-based demand response can result in noticeable peak shifting. Due to the integration of wind turbine, stability of distributed network...
As the Smart Grid develops, demand response plays a vital role for both consumers and the utilities. Changes of load behaviour under the active market is analysed and how demand response smooths out fluctuations of distributed generation (DG) by adding transactive controller to appliances is shown. The performance of demand response is demonstrated, which contributes to gentle the instability of DGs...
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.