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.
This work explores the coordinate planning methods of multiple microgrids and distribution network with mixed AC/DC interconnection method which consider the coupling influence of interconnection structure and operation mode. The structure and evaluation model of the multiple microgrids system were discussed, and then system planning models were established. In order to solve the complicated combinatorial...
For the purpose of drastically reducing the computational time of alternate arm voltage source converters in electromagnetic transient simulations, an accelerated model of AAMC is proposed based on Thevenin's theorem. This real-time simulation model is fast and efficient, and it has strong universality. The simulation results validate the simulation accuracy and acceleration ratio of the new model.
As the fault voltage and current change raptly in case of DC side line-to-line fault of voltage source converter, it's a serious threat to the whole system. Aiming at this problem, the mechanism of DC side line-to-line fault in three kinds of converters including two-level converter, three-level diode-clamped converter and Modular Multilevel Converter, was analyzed firstly. Without converter blocked,...
Custom power park is an industrial/commercial park that integrates state-of-the-art power quality devices. The power quality devices can be classified into two catalogues: voltage quality enhancement devices and current quality enhancement devices. In order to meet the requirement of large capacity, high reliability, high flexibility in both the voltage and current compensation, several operation...
The future custom power park will realize the hierarchical power supply of different voltage quality grade, meanwhile and present the grid-friendly characteristics including low pollution for grid, organic combination with distributed generation (DG) and energy storage (ES). In order to gradually achieve the goals, the function reuse and integration in the equipment level should be solved firstly...
The operation of micro-grid based renewable energy usually considers efficiency and economy in comprehensive. The control strategy based on master micro-source (MS) constant voltage constant frequency (CVCF) networking is introduced. The voltage and frequency of micro-grid is established by the master MS, and the slave MS operated on the maximum power point tracking mode, in order to achieved micro-grid...
With the nonlinear and unbalanced loads and high penetration of distributed generations connected into the power distribution network, some deteriorative influences such as poor power quality and stability issues have been caused. Static synchronous compensator (STATCOM) and another custom power device, electric spring (ES) are competent for solving these problems. This paper provides a general comparative...
Aiming at potential interaction between power grid and DSTATCOM, the paper firstly derives and analyzes the harmonic impedance of DSTATCOM, which is not only related to PLL control, but also deeply affected by the voltage control of DSTATCOM's DC bus and reactive power compensated by DSTATCOM. Then the paper illustrates harmonic resonance between power grid and DSTATCOM through impedance model. Finally,...
Aiming at the problem of nonlinear load which affect the output voltage quality of the micro-source inverter in Microgrid, An integral repetitive control strategy is proposed in the paper. The principle of integral repetitive control strategy is derivation, and its good performance is verified by micro-source inverter. Experimental results show the efficiency and reliability of the proposed control...
A mathematical model of distribution network with several different type DFACTS device was set up to analyze the interaction between each of DFACTS (Distributed Flexible AC Transmission) equipment. Based on this model, taking reactive power and harmonic content as constraint conditions, and minimum of total DFACTS configuration cost as objective function, using genetic algorithm, optimizing models...
The output voltage asymmetry could lead to working disorders and even damage of electronic devices. One of most common causes of micro-source three-phase output voltage asymmetry is local micro-source three-phase load imbalance. The problem of load imbalance has not yet the relatively general solution for micro-grid three-phase four-wire structure at present. In this paper, the two existing control...
Conventional photovoltaic grid-connected using PI current loop control, there are some shortcomings: low precision control system, on the system parameters perturbation robustness is not strong, rapid, no static error, and strong anti-disturbance load capacity is limited and so on. In order to improve the dynamic performance of the grid-connected PV inverter control system, reduce the hardware and...
To simplify grid-connected inverter control system, improve dynamic characteristics of the system, and reduce the hardware and software cost of inverter control design, the exponential sliding mode control (ESMC) and the square root sliding mode control (SRSMC) were designed. Theory testify of the sliding mode approach law applied in the grid-connected inverter was completed, and system stability...
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.