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 paper addresses the optimal current control of grid-connected converters with uncertain parameters. The grid is modeled as a voltage source, affected by harmonics, in series with an uncertain inductance. As a main contribution, the comparison of ℋ2 state feedback strategies based on linear matrix inequalities is carried out. It is shown by means of examples that a suboptimal strategy can lead...
Photovoltaic energy has gained prominence in the current context of energy generation. The fundamental element of a photovoltaic system connected to the electric grid is the electronic converter. In order to be marketed, electronic converters must be tested and certified in accordance with current standards. In the certification process, an equipment known as a solar array simulator (SAS) is used...
The development of a dead-beat current controller with a disturbance estimator for grid-connected single phase (1ϕ) voltage source (VS) inverter is presented in this paper. The 1ϕ VS inverter is connected to the grid using L-type filter. Disturbance estimator is employed to reject any disturbances due to controller time delay, inductance mismatch, and/or grid voltage disturbances. The design and analysis...
The significant mechanical inertia of the rotor in a synchronous generator is crucial for facilitating the cooperative grid forming capability of multiple such generators on the transmission and distribution network. This paper demonstrates that the DC link capacitance in a PV inverter is the analogous form of inertia for such a system, albeit having much smaller magnitude. Furthermore it proposes...
The estimation of grid impedance can be used to improve the control performance of the grid-connected inverter in distributed power generation systems and to achieve islanding detection simultaneously. Particle swarm optimization(PSO) algorithm has been widely studied in parameter identification since it converges fast and has few parameters to be set. The paper proposes a grid impedance estimation...
The bidirectional DC-DC converters are widely used in battery charging /discharging scheme. The dual active bridge scheme is adopted for the high power applications. The wide voltage variation requirement of battery charging and discharging can be fulfilled with the additional stage along with the dual active bridge. Isolated boost converter can also meet the wide voltage variation requirement. The...
A model predictive control (MPC) is proposed for a buck-type active power filter (APF) integrated single-phase quasi-Z-source inverter (qZSI) to directly eliminate the dc-side low-frequency ripple power. The buck-type APF operates independently from the main circuit power devices, comparing to the coupled-type APF. The proposed MPC compensates the low-frequency ripple power directly by the APF capacitor...
This paper presents the implementation of a MEMS tunable inductor using admittance J-inverters and a variable capacitor. The tunable inductor circuit consists of two inductors, two fixed capacitors and a variable capacitor. The MEMS tunable inductor has been fabricated using the CRONOS MUMPs® Process. Design details and results are presented for a tunable inductor designed to operate over a bandwidth...
This paper proposes a novel hybrid approach for islanding detection of inverter-based distributed generations (DG) based on combination of the Slip mode frequency-shift (SMS) as an active and rate of change of frequency (ROCOF) relay and over/under frequency relay as passive methods. This approach is utilized to force the DG to lose its stable operation and drift the frequency out of the allowed range...
This paper introduces long primary double sided linear induction motor (LIM) for special industrial applications. The LIM adopts modular structure and uses block feeding method. The significance is increasing efficiency, saving energy and reducing power capacity, the primary parallel connection with segment powered drive is adopted, which consist of long primary double sided LIMs. Each segment motor...
Three-level IEGT inverter is commonly used in steel rolling industry. We suggested that 2RCD snubber circuit has fewer components and simpler circuit structure. Based on the stray inductance distribution, we select appropriate RCD parameters. Analysis on the commutation process of three-level neutral point clamped (NPC) inverter draws a conclusion on how 2RCD snubber circuit works during commutation...
This paper presents a control scheme based on fractional proportional-integral controller for improving the load sharing among parallel-connected inverter based distributed generation in microgrid. The control context is based on the current control in which through the use of the proposed strategy dynamically preserves the proportional power sharing properties of the DG units. The results show that...
A series-tap using Modular Multilevel Current Source Converter (M2CSC) for Line Commutated Converter (LCC) based HVDC transmission system is proposed in this paper. This series-tap is useful and economical to tap small amount of power (2%–5% of the main station rating) from the current-source HVDC link. The operation of the HVDC transmission system under the influence of the proposed series-tap is...
This paper proposes a novel approach to design the LCL filter for grid interfaced PV system. A cost based minimization approach on a cost per joule basis for each of the filter elements is explored to obtain the optimal filter design. Simulation results for a 10 KVA grid connected inverter with LCL filter are presented in order to verify the behavior of the proposed design. The impact of designed...
Dual Active Bridge (DAB) is the heart of upcoming solid state transformer technology which is intended to replace bulky 50Hz/60Hz transformer. DAB ensures bidirectional power flow and magnetic isolation between HVDC and LVDC sources. Single phase DAB topologies are widely used for their simplistic structure. Single phase DABs are generally adopts scalar control. In this paper a single phase DAB is...
This paper presents a Resonant Converter with high frequency transformer(HF) magnetizing inductance (Lm) considered as shunt inductance. The resonant network comprises of series branch (Ls&Cs) and shunt branch (Lp&Cp). Shunt branch inductance (Lp) of resonant converter is used as magnetizing inductance of HF transformer. HF transformer is designed in such a way that Lm is equal to Lp which...
Central inverters are the most common configuration for large-scale photovoltaic systems. Under partial shading or any non-uniform conditions on the photovoltaic plant, several power maxima may arise. Conventional perturb and observe and other classical maximum power point tracking algorithms are capable of tracking a local maximum, but can not guarantee to operate at the global maximum. A solution...
This paper discusses the design method of a three-phase dual active bridge dc-to-dc converter (3ph-DAB) to integrate large-scale PV plants into medium-voltage (MV) dc grids. The DAB is employed as the maximum power point (MPP) tracker either on the string level or plant level. The converter's operation area is defined by the MPPs of the PV panels that are influenced by the environmental conditions...
Current control is the most basic control loop for a current controlled inverter-fed machine. Current controllers fall into two categories depending on the reference frames they operate in — rotating reference frame controllers, and stationary frame controllers. This paper introduces a novel current control technique for inverter controlled machines known as Local Vector Control (LVC). This control...
Induction heating (IH) appliances are widely used for industrial appliances and home electronics because IH has a lot of merits. Recently, wireless power transfer attracts attention as a promising industry. As for wireless power transfer, inductance is changed in accordance with power transmission distance or surrounding environment. Similarly as for IH, inductance and resistance as equivalent circuit...
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.