scholarly journals Robust optmized control of multi levels STATCOM

2019 ◽  
Vol 16 (3) ◽  
pp. 1203
Author(s):  
Tedjini Hamza ◽  
Messaoud Fatima Zahra ◽  
Kadri Boufeldja
Keyword(s):  
Power Flow ◽  
Ant Colony Algorithm ◽  
Reactive Power ◽  
Voltage Source ◽  
Static Synchronous Compensator ◽  
Multilevel Converters ◽  
Dc Voltage ◽  
Reactive Power Flow ◽  
Ac Power ◽  
Lyapunov’S Theorem

<p>Reactive power compensation is an essential part of a power system and the static synchronous compensator (STATCOM) plays an important role in controlling the reactive power flow over the transmission line. The basic building block of the STATCOM is a voltage source inverter (VSI) that generates a synchronous sinusoidal voltage and because of the high MVA ratings, it would be expensive to provide independent, equal, regulated dc voltage sources to power the multilevel converters which are presently proposed for STATCOMs. Dc voltage sources can be derived from the dc link capacitances which are charged by the rectified ac power. In this paper a new stronger control combined of nonlinear control based Lyapunov’s theorem and Ant Colony Algorithm (ACA) to maintain stability of multilevel STATCOM and the utility.</p>

Multilevel Inverter Based DSTATCOM with Energy Storage Device

2011 ◽  
Vol 55-57 ◽  
pp. 1361-1364
Author(s):  
Jun Li Zhang ◽  
Xiao Feng Lv ◽  
Chao Li
Keyword(s):  
Energy Storage ◽  
Power Flow ◽  
Reactive Power ◽  
Power Transmission ◽  
Electronic Device ◽  
Multilevel Inverter ◽  
Voltage Source ◽  
Storage Device ◽  
Energy Storage Device ◽  
Reactive Power Flow

With the growth of industry manufacturers and population, power quality becomes more and more important issue, and is attracting significant attention due to the increase in the number of sensitive loads. A distribution static compensator (DSTATCOM) is a voltage source inverter (VS1)-based power electronic device, which is usually used to compensate reactive power and sustain the system voltage in distribution power system. Compared with the traditional STATCOM, multilevel STATCOMs exhibit faster dynamic response, smaller volume, lower cost, and higher ratings. A multilevel inverter connected to an energy storage device can control both active and reactive power flow, providing more flexible and versatile power transmission operation. SPWM is actually a kind of multi-pulse trigger mode and used to trigger the switches in DSTATCOM.

scholarly journals Demodulation of Three-Phase AC Power Transients in the Presence of Harmonic Distortion

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2341
Author(s):  
Benjamin T. Gwynn ◽  
Raymond de Callafon
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Reactive Power ◽  
Harmonic Distortion ◽  
Transient Effects ◽  
Active And Reactive Power ◽  
Reactive Power Flow ◽  
Ac Power ◽  
Rlc Circuit ◽  
Smart Inverters

Load switches in power systems may cause oscillations in active and reactive power flow. Such oscillations can be damped by synthetic inertia provided by smart inverters providing power from DC sources such as photovoltaic or battery storage. However, AC current provided by inverters is inherently non-sinusoidal, making measurements of active and reactive power subject to harmonic distortion. As a result, transient effects due to load switching can be obscured by harmonic distortion. An RLC circuit serves as a reference load. The oscillation caused by switching in the load presents as a dual-sideband suppressed-carrier signal. The carrier frequency is available via voltage data but the phase is not. Given a group of candidate signals formed from phase voltages, an algorithm based on Costas Loop that can quickly quantify the phase difference between each candidate and carrier (thus identifying the best signal for demodulation) is presented. Algorithm functionality is demonstrated in the presence of inverter-induced distortion.

scholarly journals An Active/Reactive Power Control Strategy for Renewable Generation Systems

Electronics ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1061
Author(s):  
Iván Andrade ◽  
Rubén Pena ◽  
Ramón Blasco-Gimenez ◽  
Javier Riedemann ◽  
Werner Jara ◽  
...  
Keyword(s):  
Control Strategy ◽  
Power Flow ◽  
Reactive Power ◽  
Control Strategies ◽  
Voltage Source ◽  
Renewable Generation ◽  
Frequency Reference ◽  
Active And Reactive Power ◽  
Reactive Power Flow ◽  
Islanded Mode

The development of distributed generation, mainly based on renewable energies, requires the design of control strategies to allow the regulation of electrical variables, such as power, voltage (V), and frequency (f), and the coordination of multiple generation units in microgrids or islanded systems. This paper presents a strategy to control the active and reactive power flow in the Point of Common Connection (PCC) of a renewable generation system operating in islanded mode. Voltage Source Converters (VSCs) are connected between individual generation units and the PCC to control the voltage and frequency. The voltage and frequency reference values are obtained from the P–V and Q–f droop characteristics curves, where P and Q are the active and reactive power supplied to the load, respectively. Proportional–Integral (PI) controllers process the voltage and frequency errors and set the reference currents (in the dq frame) to be imposed by each VSC. Simulation results considering high-power solar and wind generation systems are presented to validate the proposed control strategy.

scholarly journals FPGA Control Implementation of a Grid-Connected Current-Controlled Voltage-Source Inverter

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Rickard Ekström ◽  
Mats Leijon
Keyword(s):  
Control System ◽  
Power Flow ◽  
Reactive Power ◽  
Moving Average ◽  
Current Control ◽  
Voltage Source ◽  
Voltage Source Inverter ◽  
Control Functions ◽  
Reactive Power Flow ◽  
Step Responses

The full control system of a grid-connected current-controlled voltage-source inverter (CC-VSI) has been designed and implemented on a field-programmable gate array (FPGA). Various control functions and implementation methods are described and discussed. The practical viability of the system is evaluated in an experimental setup, where a VSI supplies 30 kW into the local grid at 400 V. A phase-locked loop (PLL) is used for grid phase tracking and evaluated for simulated abnormal grid conditions. Power factor is kept at unity, and the implemented control system is stressed with step responses in the supplied active power. A moving-average filter is implemented to reduce the effects of noise and harmonics on the current control loops. A coupling between active and reactive power flow is observed for the step responses but may be ignored in this context. The proposed system is fully comparable with more conventional microprocessor-based control systems.

scholarly journals Power Flow Management by Active Nodes: A Case Study in Real Operating Conditions

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4519
Author(s):  
Stefano Bifaretti ◽  
Vincenzo Bonaiuto ◽  
Sabino Pipolo ◽  
Cristina Terlizzi ◽  
Pericle Zanchetta ◽  
...  
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Load Flow ◽  
Operating Conditions ◽  
Specific Power ◽  
Renewable Energy Resources ◽  
Network Cluster ◽  
Reactive Power Flow

The role of distributor system operators is experiencing a gradual but relevant change to include enhanced ancillary and energy dispatch services needed to manage the increased power provided by intermittent distributed generations in medium voltage networks. In this context, the paper proposes the insertion, in strategic points of the network, of specific power electronic systems, denoted as active nodes, which permit the remote controllability of the active and reactive power flow. Such capabilities, as a further benefit, enable the distributor system operators to provide ancillary network services without requiring any procurement with distributed generation systems owners. In particular, the paper highlights the benefits of active nodes, demonstrating their capabilities in reducing the inverse power flow issues from medium to high voltage lines focusing on a network cluster including renewable energy resources. As a further novelty, this study has accounted for a real cluster operated by the Italian distributor system operator Areti. A specific simulation model of the electrical lines has been implemented in DigSilent PowerFactory (DIgSILENT GmbH–Germany) software using real operating data obtained during a 1-year measurement campaign. A detailed cost-benefit analysis has been provided, accounting for different load flow scenarios. The results have demonstrated that the inclusion of active nodes can significantly reduce the drawbacks related to the reverse power flow.

Effect of Feedback Control on the Power Consumption of Induced-Strain Actuators

2000 ◽  
Author(s):  
Sriram Chandrasekaran ◽  
Douglas K. Lindner ◽  
Don Leo
Keyword(s):  
Structural Control ◽  
Power Flow ◽  
Reactive Power ◽  
Flow Characteristics ◽  
Control Laws ◽  
The Real ◽  
Reactive Power Flow ◽  
Flow Through ◽  
Sinusoidal Disturbance ◽  
A Current

Abstract In this paper we study the closed loop power flow characteristics between a controlled piezoelectric actuator and a current controlled drive amplifier for two different structural control laws. We determine the real and reactive power flow through the structure and actuator into the amplifier when the structure is excited with a sinusoidal disturbance force under both control laws. The dependence of the real and reactive components of the power on the material properties of the actuator, structure and the configuration of the controller is presented. These real and reactive power estimates are useful for sizing the drive amplifier for the actuator.

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