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The control strategies of micro grid is an important topic for micro grid. With the development of DC micro grid, the control strategies of DC micro grid is drawing more and more attention. Nowadays, the most widely used control strategy of DC micro grid is droop control. All the distributed generators and energy storage systems share loads through different droop coefficients in droop control. This...
Energy router is an emerging conceptual device based on advanced power electronic technique. It is able to realize the flexible and dynamic electric power distribution in power systems as information router in the Internet. It is of great interest to investigate how the energy router can be used to improve the power system operation. This paper proposes a generalized configuration of the energy router...
This paper presents an optimal control of multiterminal high voltage DC (MTDC) networks. The conventional methods of controlling direct voltages of MTDC networks suffered from serials of issues, such as lack of ability to steer the power flow, less expandability to scale up and poor dynamic responses. In this paper, an innovative strategy of regulating DC voltages is derived through three main steps:...
In the case of low voltage (LV) distribution networks, the inclusion of smart homes is expected to increase the systems complexity due to multiplicity of interacting users with autonomous use of energy and the highly penetration of photovoltaic (PV). Consequently, the shift towards smart LV distribution systems implies that the traditional unidirectional power flow formulation and control strategies...
This paper aims to present a methodology to identify Voltage Control Areas (VCA) for Secondary Voltage Control (SVC). The proposed methodology consists in the representation of data uncertainty using Affine Arithmetic (AA) applied to the Power Flow Analysis. The uncertainty used in this paper is associated only with reactive power demand, mainly due to forecast errors. The IEEE 14 bus test system...
Steady state analysis of power grids is typically performed using power flow analysis, where nonlinear balance equations of real and reactive power are solved to calculate the voltage magnitude, phase, and power at every bus. Transient analysis of the same power grids are performed using circuit simulation methods. We propose a novel approach to modeling the nonlinear steady state behavior of power...
Delta compensated UPS can compensate ± 15% fluctuation of the grid voltage. In this condition, UPS supplies a stable sinusoidal voltage and maintains the input and out power balance by regulating the input current. The power balance is completed by cooperative work of the two converters, one converter operates in the rectifier state, and the other one operates in the inverter state, so that ensure...
Photovoltaic power connected the distribution network has changed the power flow, resulting in voltage rise at PCC. Various methods have been proposed to limit the voltage within standard. Different methods were compared in this paper to identify their advantages and disadvantages. First, pure active power was injected in order to study the influence on voltage of each node; then every active voltage-control...
Reactive power optimization configuration includes two aspects: the choice of the reactive power compensation point and the reactive power compensation capacity. If these can be determined reasonably, voltage quality and system voltage stability can be effectively improved. This can also reduce network losses and improve power supply economics by avoiding long distance transportation of a mass of...
Brushless doubly-fed generator (BDFG) as a stand-alone power generation has a wide application of variable speed constant frequency (VSCF) generator in some embedded generation systems, such as ship shaft generator systems. In this paper, an excitation control strategy for stand-alone BDFG is introduced, the similarities and differences of system structure and control strategy between the grid-connected...
Since the very beginning of FACTS controllers, congestion management is one of the parameters we control through it. This paper provides the control of power flow and bus voltages in grid using the FACTS controllers. In AC transmission line, power flow can be controlled by injecting a compensating voltage in series with the line. We consider the steady state model of two FACTS Controllers - SSSC,...
This paper presents two Newton power flow models - the variable shunt susceptance model and the firing-angle model of the static VAR compensator (SVC). Both these models depict the SVC as a variable shunt susceptance. Here, the SVC state variables are combined with the nodal voltage magnitudes and angles of the network for Newton power flow solution. Both these models possess very strong convergence...
An investigation was conducted to install wind farm to supply electrical power to the village of Ras Munif, the highest elevation in Jordan. The village installed capacity load was found to be 500 kW. A 25 windmills, 20kW each, forming the wind farm was found to be the best choice to supply the village with 100% of its needed power. The windmills will be spaced 50 meters along an unobstructed continuous...
Vehicle-to-grid (V2G) or G2V systems essentially require an interface between the electric vehicle (EV) and the grid to facilitate the V2G concept. This paper presents a wireless power interface for the grid integration of EVs. The proposed bi-directional wireless power interface is based on the Inductive Power Transfer (IPT) Technology, and comprises a high frequency IPT system and a low frequency...
Bidirectional and contactless power delivery to electric vehicles (EVs) or vehicle-to-grid (V2G) applications can be realized through Inductive Power Transfer (IPT) technology but essentially requires a two-stage power conversion process. This paper proposes a novel matrix converter based IPT interface that requires only a single-stage power conversion process to facilitate bi-directional and contactless...
Due to the asynchronous generator has many negative factors such as large power fluctuation, poor transient performance, low energy efficiency, etc. The doubly fed induction generator(DFIG) is becoming a popular concept and thus the modeling of DFIG becomes an interesting research topic. This paper develops the DFIG model of power flow and third-order transient in which the power converter is simulated...
Structural features has been analysed after the third part of SINOPEC Tianjin company's power system been put into operation. Node voltage been treated as the constraint, minimum power loss been treated as the objective function, used PSASP to calculated the different way of generator's combination, the voltage , power flow, power loss has been compared before and after the OPF calculation. The conclusion...
The feasibility and potential benefits of the system-wide Automatic Voltage Control (AVC) in PJM system are studied in this paper. A test AVC system with a hierarchical structure is adopted for simulation study, which is based on eight typical real-time snapshots from the solutions of state estimator in the PJM's Energy Management System (EMS). For each snapshot, the control action simulation is executed...
Power system engineers are currently facing challenges to increase the power transfer capabilities of existing transmission system. This is where the power electronic Flexible AC Transmission Systems (FACTS) technology comes into effect. Simulation tools are available to check the influence of a FACTS device on the power system. In this paper we have tried to explain the different FACTS devices both...
A power conditioning system consisting of a Super-conducting Magnetic Energy Storage (SMES) which can be used to smooth out differences between output power of a generator and power loads is analyzed in this paper. The SMES is connected in shunt with the distribution lines through a converter. The converter is a voltage source converter type with a DC-chopper. The system is controlled by three regulators;...
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