With rising power system complexity from decentral and renewable generation, it is becoming increasingly challenging to ensure safe, reliable power supply. However, with a detailed analysis from PTI Consulting of the influencing factors on dynamic and transient stability, grid operators can maintain a high availability of supply and prevent damage to operating equipment.
Increase power system availability and supply reliability.
Avoid damage to equipment and system outages.
Adhere to international standards and meet operational requirements
Ensure the dynamic stability of power networks.
The increasing presence of power electronic devices, resulting from the integration of renewable energy sources, and the decentralization of generation are leading to more stability issues in power grids. PTI Consulting offers simulation and analysis of the dynamic behavior of the power systems to identify relevant measures to improve power system stability. Our studies range from transient stability, and rotor angle stability, to voltage stability, small signal stability, and frequency stability analyses.
Our experts are experienced in identifying measures that help to ensure safe and reliable operation even at high loads, such as the design of controllers for power oscillation damping and the optimization of power system stabilizers.
Ensure stable long-distance power transmission or the decoupling of grids.
The importance of high-voltage direct current (HVDC), long-distance interconnections, and back-to-back couplings has significantly increased all over the world. This is especially the case for wind parks far from shore or as hybrid AC/DC grid concepts in island networks without their own generation, or with generation using a small share of synchronous machines.
The experts at PTI Consulting assess and verify HVDC as a solution using load flow and dynamic analyses. We evaluate solutions for power system coupling and stability improvement, and analyze the impact on frequency and voltage stability, including the definition of suitable control strategies.
Protect operating equipment against excessive transient voltage stresses.
Power grids’ increasing decentralization and operational complexity require particular attention to transient stresses in the planning and installation stages. Over-voltages or surges caused by switching operations, ground faults, or external events such as lightning strikes can cause impermissibly high voltage stresses and result in damage to equipment ‒ or even power outages.
Our consultants at PTI provide consultancy and simulation-based technical studies on surge arrester dimensioning, insulation coordination, and over-voltage protection to safeguard your grid assets and ensure compliance with industry standards such as IEC 60071.
Minimize the risk of subsynchronous resonances.
Series compensation on transmission lines is a cost-effective method for increasing the transmission capacity, but it also imposes the risk of SSR for the power plants connected nearby. This may result in insufficiently damped or even amplified oscillatory phenomena on the shaft of generators. Likewise, power converters located close to generators or to other power converters could lead to resonances, followed by poorly damped or negatively damped torsional oscillations in rotating masses or controller responses.
We at PTI Consulting simulate and analyze SSR/SSTI/SSCI phenomena by means of eigenvalue, frequency, and transient torque analysis in the time domain. Based on the results, our experts evaluate and recommend appropriate mitigation measures, such as topology improvements and additional equipment.
Ensure a safe, efficient, and quick power system restoration.
After a blackout, the grid’s re-energization must be processed, considering national and regional organizational aspects and technical requirements. Generating units must be capable of being started independently of external power sources and of energizing the network parts to which the generation unit is connected.
PTI Consulting has the experts who design and evaluate restoration plans as well as frequency and voltage controllers for black starts, considering the active loads in sub-networks to be restored. We also offer transient studies for equipment energization, such as for lines or transformers.
