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 purpose of this paper is to reveal the effect of control gain in the proposed fast PD control method. A bode diagram is described using a loop transfer function. The variation tendency of frequency characteristics for different values of fast proportional gain and fast differential gain is discussed. Moreover, the frequency characteristics of proposed method are compared with the conventional...
Power converters have been widely used in industrial applications as parallel and series compensators, UPQCs, and STATCOMs. These electronic devices can also be utilized on weak-grid or micro-grid systems, where both the supply voltage amplitude and frequency, may vary considerably from the nominal values. Micro-grid and weak-grid systems are commonly associated to distribute non-conventional power...
This paper considers the compensation of both flow disturbance and floor vibration for pneumatic anti-vibration apparatuses (AVAs). To compensate for effects of the flow disturbance, repetitive control is employed. When the tunable parameter of a repetitive controller is high gain, the flow disturbance is further suppressed. On the other hand, transmissibility increases. To overcome the trade-off...
This paper proposes an H∞ current controller that allows power converter input admittance shaping, both in modulus and in phase, in a three phase voltage source converter to grid connection through an L filter. In addition to this new feature, controller allows grid current tracking. Proposed controller tries to solve then trade-off problem between stand-alone converter performance (current tracking)...
The dynamic control of a bidirectional charger based on a dual active bridge (DAB) cascaded with a singlephase grid inverter is the scope of this work. Due to a small dc-link capacitance the power fluctuation of the grid at twice the grid frequency is transferred to the battery. To compensate this ac-power fluctuation it is demonstrated how the switching pattern must be selected to achieve a continuous...
This paper presents a control scheme for Static Compensators applied in distribution systems (DSTATCOM), that are used for regulation of voltage magnitude at point of common coupling (PCC) and it also has the function of eliminating harmonics of voltage through PCC-voltage-detection method. Voltage-magnitude regulation is accomplished through quadrature-current injection at PCC and harmonic mitigation...
This paper presents a distributed control technique for voltage, frequency and active/reactive power control of the Point of Common Connection (PCC), AC grid, of a wind farm. Each wind turbine uses a Permanent Magnet Synchronous Generator (PMSG) with a full back-to-back VSI topology connected between the machine terminals and the PCC. A Diode-Thyristor converter topology forming a HVDC link is used...
Hybrid Energy Storage Systems (HESS) can supply power more flexibility and balancing to the grid, providing a backup to intermittent renewable energy. Locally, it can improve the management of distribution networks, reducing costs and improving efficiency. In this way, it can ease the market introduction of renewables, accelerate the decarbonization of the electricity grid, improve the security and...
In this paper, different control strategies are presented for primary frequency regulation in a diesel-photovoltaic-supercapacitor hybrid power generation system. Firstly, a classical control approach is proposed as a reference. Then, a robust control design based on H∞ control theory is applied to the studied system. Starting from given certain desired performances, Linear Matrix Inequalities (LMI)...
Nowadays in high-power industrial processes, multipulse cycloconverters are the most commonly used converter for high power mill drives. This paper propose an analysis of the interharmonics currents behavior under an unbalanced load, injected by a Cycloconverters (CCVs) with 12- pulse configuration and multi-winding transformers. Three-phase transformers with two secondary windings with star and delta...
This paper demonstrates that using a control strategy based on a fractional derivative scheme improves the response of an energy storage unit, thus making better use of the resources available versus using other control strategies based on classical PD control. The energy storage technology studied in this paper is the flywheel. By optimizing its response, the storage equipment requirements are decreased,...
This work evaluates the performance of a nonlinear control strategy of a modular photovoltaic (PV) plant that is used to support grid frequency control. The PV plant is designed based on a real study case and it has a modular structure consisting in several generating units. Each generating unit consists in PV arrays interfaced to the grid with a three-phase three-level cascaded H-bridge converter...
Voltage source inverters (VSI) with LCL filter play an important role in grid connected applications. Features such as bidirectional power flow, reduced filter volume and good electromagnetic compatibility performance make this a suitable solution for such applications. However, the current control strategy becomes more complex if compared to VSIs with simple inductive filters. Among various current...
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.