Influence of Reactive Power Flow on the DC-Link Voltage Control in Voltage-Source Converters

2018 ◽  
Author(s):  
Dapeng Lu ◽  
Xiongfei Wang ◽  
Frede Blaabjerg
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Voltage Control ◽  
Voltage Source ◽  
Voltage Source Converters ◽  
Reactive Power Flow

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.

Reactive power flow optimization in the presence of Secondary Voltage Control

2009 ◽  
Author(s):  
Valentin Ilea ◽  
Cristian Bovo ◽  
Marco Merlo ◽  
Alberto Berizzi ◽  
Mircea Eremia
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Voltage Control ◽  
Flow Optimization ◽  
Reactive Power Flow ◽  
Secondary Voltage

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>

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.

Voltage Control in Transmission Grids Considering Uncertainties of Renewable Energy Sources_preprint.pdf

2020 ◽  
Author(s):  
Markus Knittel ◽  
Neelotpal Majumdar ◽  
Maximilian Schneider ◽  
Nicolas Thie ◽  
Albert Moser
Keyword(s):  
Renewable Energy ◽  
Power Flow ◽  
Power Plants ◽  
Reactive Power ◽  
Voltage Control ◽  
Active Power ◽  
Soft Constraints ◽  
Reactive Power Flow ◽  
Probability Densities ◽  
Optimal Reactive Power Flow

Power traders and system operators need to balance the uncertain generation of renewable energy sources by adapting the dispatch of conventional power plants. This poses a challenge to voltage control in power system operation. Accordingly, this paper presents a method to determine voltage magnitude probability densities which are integrated into an optimal reactive power flow to consider an uncertain active power generation. First, the probability densities are determined by Monte Carlo simulations including a unit commitment problem to derive the dispatch of conventional power plants. Second, uncertainty restrictions are used to create soft constraints for the optimal reactive power flow, which mitigates the risk of voltage limit violations. By adapting the soft constraints slack costs, the consideration of uncertainties can be prioritized in relation to other objectives, such as the reduction of active power losses, or reactive power costs.<br>

scholarly journals Voltage Control in Transmission Grids Considering Uncertainties of Renewable Energy Sources_preprint.pdf

2020 ◽  
Author(s):  
Markus Knittel ◽  
Neelotpal Majumdar ◽  
Maximilian Schneider ◽  
Nicolas Thie ◽  
Albert Moser
Keyword(s):  
Renewable Energy ◽  
Power Flow ◽  
Power Plants ◽  
Reactive Power ◽  
Voltage Control ◽  
Active Power ◽  
Soft Constraints ◽  
Reactive Power Flow ◽  
Probability Densities ◽  
Optimal Reactive Power Flow

Power traders and system operators need to balance the uncertain generation of renewable energy sources by adapting the dispatch of conventional power plants. This poses a challenge to voltage control in power system operation. Accordingly, this paper presents a method to determine voltage magnitude probability densities which are integrated into an optimal reactive power flow to consider an uncertain active power generation. First, the probability densities are determined by Monte Carlo simulations including a unit commitment problem to derive the dispatch of conventional power plants. Second, uncertainty restrictions are used to create soft constraints for the optimal reactive power flow, which mitigates the risk of voltage limit violations. By adapting the soft constraints slack costs, the consideration of uncertainties can be prioritized in relation to other objectives, such as the reduction of active power losses, or reactive power costs.<br>

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.

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