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 this paper, a modulation strategy based on zero-sequence voltage injection is proposed for module multilevel converter (MMC). By the proposed method, the remaining capacitor voltages not vary and the line-to-line voltages are balanced. This method is easy to be implemented by adjusting the voltage injection coefficient when SM fault occurs. The coefficient of injected zero-sequence voltage is designed...
Supercapacitors (SCs) are increasingly used in energy storage system (ESS) to tackle the fast power transients. They can be used individually or together with other energy storage units like batteries. In a microgrid, multiple SCs could be installed at different locations without communication among each other. This paper addresses the energy management strategy (EMS) of multiple SCs in a DC microgrid,...
This paper proposes a hierarchical control strategy that achieves the power management and coordinated control of grid-connected DC microgrids. The proposed control architecture consists of two levels. In the primary control level, State-of-charge (SOC) based droop control is applied to the interfacing converters of storage elements (SE). The droop slope is adjusted according to individual SOC, aiming...
Modular multilevel converter (MMC) as a new converter topology has been widely used in the field of the high voltage direct current transmission (HVDC) and flexible alternating current transmission system (FACTS). This paper established a MMC Hardware-in-Loop (MMC-HIL) Platform based on RT-LAB. This platform contains a monitor computer, the OP5600 object machine, a modular multilevel converter, digital...
The field of Multi-agent system (MAS) is an area increasingly studied. With advantages of autonomy, collaboration and reactivity, MAS has been widely used in smart distribution network. This paper summarizes the main applications of MAS in smart distribution network, including micro-grid energy management and coordination, protection system of distribution network, condition monitoring and fault diagnosis,...
To provide 2 types of DC voltage, a bipolar-type DC micro-grid is adopted in this paper. The I-U droop control is proposed to achieve parallel operation of three-level converters in DC micro-grid. To solve unbalance potential of converters, the neutral point potential control is added into the I-U droop control. To eliminate influence of line impedance and improve the accuracy of power distribution,...
In this paper, on the basis of the computational verb theory, we set special local verb rules and specific initial conditions to try to simulate some phenomena in two dimensional computational verb cellular networksthen we get some diffusion and wave propagation patterns. We pick up three typical types to be shown in this paper, that is, ripple propagation patterns, target wave propagation patterns...
Computational verb cellular networks (CVCNs) are a new kind of cellular computational platform where the cellular rules are computational verb rules. Since the richness of computational verb rules, CVCNs are of many kinds. In the previous works, the categorizations of patterns formed in two-dimensional computational verb networks (2D CVCNs) with Moore-neighborhood were studied. In this paper, we use...
In this note, we give the definition of the fuzzy q-Bernstein polynomials and discuss their properties. We obtain the approximation rate of the fuzzy q-Bernstein polynomials and the fuzzy limit q-Bernstein operators. We show that the fuzzy q-Bernstein polynomials have the shape-preserving properties. We also obtain the convergence rate of the fuzzy q-Bernstein polynomials for fixed q ∈ (0, 1). The...
One way to minimize threats in P2P system is to exploit reputation to help evaluate the trustworthiness and predict the future behaviors of peers. Most existing methods for trust management, which are based on reputation, focus on preventing network from the malicious peers. In fact, peers' capabilities to fulfill the tasks are also important factors, which will greatly impact the efficiency of P2P...
Three-level inverter has gained the advantage over traditional two-level inverter in high-voltage and high-power motor control. A 2.2 kW three-level voltage source PWM inverter for ac motor applications is described. Space vector modulation (SVM) algorithm is briefed for this inverter. To avoid the switches of the same bridge leg from turning on simultaneous, dead time is added through hardware 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.