Technical Presentations

Modeling of MMC-based STATCOM with Embedded Energy Storage for the Simulation of Electromagnetic Transients882

Abstract
The Delta-connected STATCOM is regarded as the most advantageous topology for STATCOMs based on the Modular Multilevel Converter (MMC) technology. Embedding energy storage devices into the MMCs has ga... see moreined significant research interest in recent years. This presentation focuses on modeling of MMC-based Delta-STATCOMs with embedded energy storage. A flexible modeling approach is proposed, which allows easy interfacing of various converter models with various energy storage device models. Four commonly used types of MMC models are applied to STATCOM modeling: detailed, detailed equivalent, arm equivalent, and average value. Supercapacitors and batteries are used as energy storage devices. Dynamic performances of the models are compared in transient simulation cases using EMTP.

Tag(s): STATCOM/SVC, Modular Multilevel Converter, Energy Storage Devices, Modeling, Electromagnetic Transients

Sub-Synchronous Resonance (SSR) Phenomena for Synchronous machine – Simulation & Analysis using EMTP and mitigation technique890

Abstract
Synchronous generators are exposed to oscillatory stresses due to their proximity to statcom devices and other power electronics devices, such as FSCs, HVDC controllers, and STATCOMs, which generate s... see moreub-harmonic frequencies. The interaction between sub-harmonic frequency components and mechanical mass can lead to Sub-Synchronous Resonance (SSR), an unstable and dangerous condition that causes torsional oscillation in the turbine generator shaft. This can reduce machine life, cause fatigue and damage to the shaft, and even result in its breakage. To avoid this, SSR detection/protection should be installed in generator units close to series compensated transmission lines. Different SSR modes can occur depending on the network condition and degree of compensation provided. Comprehensive Torsional Vibration Monitoring & Analysis systems are expensive, but there are cost-effective solutions to sense sub-harmonic quantities reliably at low amplitudes based on desired magnitude of sub-synchronous voltage and/or current. The offered solutions are supported by simulations, studies, modeling, and detailed analysis carried out in EMTP®.

Tag(s): Protection, Stability Studies, HVDC, STATCOM

Study of Sub-synchronous Resonance for thermal power plants connected on Vietnamese grid using EMTP®867

Abstract
Study of Sub-synchronous Resonance for Thermal Power Plants Connected on Vietnamese Grid Using EMTP

Tag(s): Synchronous Machine, Subsynchronous Ressonance, Undamped Oscillations, FACTs, Series Compensation, TCSC, STATCOM

Developing a Manufacturer Black Box STATCOM Model in EMTP837

Abstract
This presentation goes over the development of a black box STATCOM model in EMTP, using manufacturer source code, and benchmarking of the model performance.

Tag(s): statcom, real code, dll, black box

POWERGRID experience with EMTP793

Abstract
To meet the increasing power demand, a number of extra high voltage (EHV) transmission lines is being added to the power system network, which enhances the complexity of power system network. It is es... see moresential duty of power engineer to fulfill the growing demand ensuring the reliability, stability & security of GRID. Transient simulation tools like EMTP play a vital role to provide the flexibility to power engineer for simulating/studying the various case scenarios which couldn’t be simulate in physical power system.


Such tools eventually help power engineer to build a sustainable and secure GRID. In POWERGRID, being a central transmission utility, various studies are being carried out to arrive the technical particular of new transmission system and optimize or fine tuning of existing system. Some of them i.e. Transient Recovery Voltage (TRV) study of 1200kV Transmission network, Smart Power from insulated earth wire of EHV transmission line and 1200kV Transformer Inrush current study are discussed in presentation. 1200kV National Test Station was established & successfully charged along with the transmission line in state of BINA in India.


TRV study was carried out for assessment of various test duties of 1200kV Circuit Breaker. Presentation cover the detailed discussion of 1200kV TRV study and a brief about the facilities like HIL, HVDC control Replica setup, STATCOM replica setup available at Powergrid Advanced Research and Technology Centre (PARTeC).