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The multiplicity of transactions frequently leads to the conditions where the operating zone will not remain secure in the field of emerging electric power systems. In the system of power security advancement, the highly Flexible AC transmission systems (FACTs) controllers will play a prime role. But because of large scale capital investment it is required to locate the FACTs controllers in the power...
Distribution STATCOM (D-STATCOM) is a custom power device connected in parallel to power system. In this paper, Neuro-Fuzzy Controller (NFC) which has robust structure is proposed for control of D-STATCOM's dq-axis currents. Designed NFC is first order Mamdani type NFC structure and has two inputs, one output and six layers. D-STATCOM is based on three-level cascaded inverter and this inverter is...
This paper presents the STATCOM using gradationally controlled voltage inverter. It consists of three inverter units connected in series, and each inverter unit generates a different output voltage such as Vc, 2 Vc, 4 Vc. This inverter can output 15 levels of voltage waveform by combinational output voltage of inverter units. The inverter units of output voltage 2 Vc, 4 Vc supply reactive power by...
A Static Synchronous Compensator (STATCOM) is a device that can provide reactive power support to an electric power system bus. It consists of a voltage sourced converter connected to an energy storage device on one side and to the power system on the other side. This paper presents the detailed design of the control system for a PWM-based STATCOM. Since the control system is designed to be implemented...
The testing of a controller for a proposed 10 MVA STATCOM through hardware-in-the-loop experimentation is described in this paper. The electrical environment into which the STATCOM is to be inserted, including a significant portion of the utility network and a nearby wind farm are simulated using a large-scale digital real time electromagnetic transients simulator. The STATCOM controller is interfaced...
Multilevel neutral point clamped inverter systems are increasingly used in load compensation applications. But, the most significant problem associated with these compensators is the capacitor voltage imbalances and drift due to DC components in the zero sequence current, resulting in degradation of tracking performance of the voltage source inverter. This paper proposes a carrier based PWM control...
This paper discusses design and performance issues of three design techniques for DSTATCOM controller with an aim to improve the robustness. The state feedback controller of DSTATCOM has been designed using linear quadratic regulator (LQR), linear quadratic regulator with prescribed degree of stability and particle swarm optimization (PSO). Weak AC source and unbalanced nonlinear load are considered...
Distribution grids are increasingly populated by a variety of renewable energy sources, which create new opportunities in terms of efficient use of energy and can also help to improve power quality. In fact, they are connected to the grid by means of power switching interfaces (PSI) which are capable to control power flow and waveform of absorbed currents as well. They can therefore contribute to...
This paper presents a 10 MVA multilevel inverter for the application of static synchronous compensator (STATCOM). Emitter turn-off (ETO) thyristors are used as active switching devices in the inverter. The cascade multilevel inverter is based on ETO light H-bridge building block (HBBB). The technology innovations of ETO simplify the HBBB construction. Air-cooled heat pipes also decrease the cost and...
The conventional hysteresis current controller is simple to implement, has inherent peak current-limiting capability, fast dynamic response etc. However, it suffers from the drawback of variable switching frequency, which may be prohibitively high, increasing the stress levels on the switches. Although a ramp controller may be used to achieve a constant switching frequency, the selection of frequency...
The cascaded H-bridge converter (CHC) topology is ideal for implementation of direct connection static compensators (STATCOMs). However the topology requires significantly different control strategies as compared to conventional two level transformer connected STATCOMs and other multilevel STATCOMs. This paper outlines all aspects of a novel controller for a CHC STATCOM, from the capacitor voltage...
Entergy has installed SVCs at two of its major load centers. Extensive voltage stability assessment was performed to understand any operational problems and to determine the most efficient size and location of the SVCs. This paper presents a brief summary of the planning aspect of one of the installations and provides details on one of the unique features of this SVC, which is coordinated control...
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