China
Africa
Explore chapters and articles related to this topic
Compensation in Power System
Published in Amitava Sil, Saikat Maity, Industrial Power Systems, 2022
Static Synchronous Compensator (STATCOM) – A STATCOM generally consists of a voltage source converter that is used to convert the DC input voltage to an AC output voltage, a DC capacitor for supply of constant DC voltage of the voltage source converter, an inductive reactance which is a transformer connected between the output of voltage source converter and power system and a harmonic filter, which has operating principle, similar to those of rotating synchronous compensators (i.e. generators), but with relatively faster operation. Since in the STATCOM, the voltage source is created from a DC capacitor, STATCOM has very little active power capability. For dynamic compensation that facilitates enhanced voltage stability by providing reactive power support to the power system, STATCOM is preferred over SVCs in view of faster response and requirement of less space. The reactive power compensation provided by STATCOM is more than SVCs because at a low voltage limit, the reactive power drops off as the square of the voltage for the SVCs, but drops off linearly with the STATCOM. STATCOM at reduced voltage can still maximum current, whereas SVC current capability reduces in proportion to voltage. As a result, STATCOM has superior dynamic response, and for comparison, STATCOM may be rated for 75% of SVC rating for same performance in response to line fault. Active voltage control is possible with a STATCOM. This could further help with system stability control. The schematic diagram of STATCOM is shown in Figure 19.4 using voltage source convertor.
Solutions for Transient Stability Issues of Fixed-Speed Wind Generator Systems
Published in Mohd Hasan Ali, Wind Energy Systems, 2017
A static synchronous compensator (STATCOM) is a second-generation flexible AC transmission system controller based on a self-commutating solid-state voltage source inverter. It is a shunt-connected reactive compensation equipment that is capable of generating or absorbing reactive power whose output can be varied to maintain control of specific parameters of the electric power system. As can be seen from Figure 8.5, excluding the DC-to-DC chopper and SMES coil the remaining components represent the basic two-level STATCOM, which is used in this book.
An analytical method for voltage sag profile estimation of a power system with STATCOMs
Published in Rodolfo Dufo-López, Jaroslaw Krzywanski, Jai Singh, Emerging Developments in the Power and Energy Industry, 2019
Qingbin Wang, Ri Cai, Yun Yang, Hui Huang, Xiongkeng Zhan, Chuangdao Li, Gai Li, Rongqin Huang
A static synchronous compensator (STATCOM) is a typical electronic-based power device that can maintain connected bus voltage by injecting reactive power when system disturbances occur, such as faults and large load variation. Thus, it can also improve the voltage sag performance of a power system (Hingorani et al. 2000). With the rapid technical development and decreasing costs of electronic devices, STATCOM could be an effective and economical compensation device for voltage sag, especially as a system-level solution (Chan & Milanović 2015).
Impact of D-STATCOM and OLTC with Integrated Volt/var Control in Distribution System for Power Loss Minimization and Voltage Control
Published in Smart Science, 2023
Bharat Singh, Ashwani Kumar Sharma
In the earlier distribution system, the reactive power employs capacitor banks, tap changers, Voltage regulators, synchronous condenser and shunt reactors, etc. In addition, there are a lot of challenges faced likewise, Voltage collops, sag, swell, Voltage flickers, low power factor, phase current balancing, switching in capacitor banks, line loss, and loss of generation in the distribution system. Power electronic devices have played a crucial role in the distribution system named D-FACT devices with facing these challenges. The several features of D-FACT devices are; the fast operating speed, higher switching frequency, bi-directional operation, the lower power consumption, etc. Therefore, the automation in the distribution system is possible with D-FACT devices. In addition, power electronic devices can dynamic real power exchange, fast reactive power control, fast dynamic providing the Voltage control, reactive power support, and power loss minimization with the enhancement of more considerable stability margin operation [1]. The D-FACT device named Distribution Static Synchronous Compensator (D‐STATCOM) is suitable for reactive power compensation with these features; Voltage source behind a reactor with a voltage source converter-based device, along with a DC capacitor for creating the voltage source. Therefore, a small amount of absolute power is capable. In addition, D-STATCOM compensates for the reactive power, maintains the voltage profile [2], low voltage-ride through a problem, regulates voltage, power factor, and enhances the stability margin.
A Capacitor Voltage Balancing Scheme for a Single-Phase Cascaded H-Bridge STATCOM
Published in Electric Power Components and Systems, 2018
Yarlagadda Srinivasa Rao, Mukesh Kumar Pathak
The static synchronous compensator (STATCOM) is used in the transmission lines to regulate the line voltages and to increase the active power flow. The voltage source converter (VSC) suitable for STATCOM is realized by (i) Two level converter and a line frequency transformer, (ii) multi-pulse converters, and (iii) multi-level converters. The line frequency transformer is costly, bulky, and lossy, so this type of converter is not preferred for medium voltages. The multi-pulse static converter can be used for shunt compensation [1] but due to the requirements of the complex phase shifting transformer, the multi-pulse converter is also less preferred. Owing to the disadvantages of transformers, the multi-level converters [2–28] are preferred for the medium voltage and high power applications. The basic topologies in multi-level converters are diode-clamped converters, flying capacitors converters, and cascaded H-bridge (CHB) converters. In realizing the shunt compensators, generally CHB multi-level converters are used [2–28]. The major advantage of cascaded multi-level converter is its modular structure, which is easy for both maintenance as well as future extension.