What are the recent relationships of Electromagnetic Compatibility with High Voltage and High Current Systems
Electromagnetic Compatibility (EMC) has become increasingly important in high voltage and high current systems due to the growing complexity of
electrical grids and the integration of smart technologies. Recent developments highlight several key relationships between EMC and these systems:
EMC Challenges in High Voltage Substations
High voltage substations face significant EMC challenges, particularly with the introduction of smart devices and automated control systems. The
electromagnetic environment in these substations can be harsh, potentially affecting the reliability and safety of the power system[6].
Smart Device Vulnerability
SMART devices (SD) used in automated technological control systems (ATCS) at high voltage substations are particularly susceptible to electromagnetic
interference. Studies have shown that electromagnetic interference in relay circuits during short-circuits and switching operations can exceed permissible values for SMART relay protection and automation devices, indicating their low noise immunity[7].
Shielding Solutions
To address EMC issues in high voltage substations, improved shielding techniques have been developed:
- Shielded cables are now considered a necessary measure to ensure EMC of SMART devices in ATCS of high voltage substations[7].
- Grounding of cable shields on both sides has been found to be more effective at high frequencies (0.5-1 MHz) and for aperiodic impulses[7].
EMC in Electric Drive Systems of New Energy Vehicles
The electric drive systems of new energy vehicles generate high-amplitude and high-frequency interference, presenting unique EMC challenges[1].
Closed-Loop Research Method
A closed-loop research method for on-load electromagnetic compatibility testing and simulation has been proposed for electric drive systems of new energy vehicles. This method includes:
- EMC design of on-load test equipment
- Establishment of a conducted EMI simulation platform
- Optimization of conducted EMI performance based on key parameters and PWM control[1]
Experimental Findings
- Increasing the parasitic inductance of the IGBT gate leads to higher conducted emission levels in the 2-30 MHz range[1].
- Using DPWM3 modulation mode can reduce conducted emission amplitude by about 2 dBμV in the 200 kHz-2 MHz range[1].
EMC in High-Power Industrial Electric Drives
High-power frequency converters in industrial settings can cause significant distortion of voltage shape at common coupling points for consumers[2].
Adaptive PWM Algorithms
Adaptive AFEPWM algorithms have been developed to minimize Total
Harmonic Distortion (THD) in 6-35 kV grids. These algorithms adjust the AFE switching angles to optimize EMC performance[2].
Specialized Passive Filters
The use of specialized adjustment filters has been proposed to reduce extremes in the frequency response of 6-35 kV grids and shift them towards the main harmonic[2].
EMC Testing for High-Voltage Equipment
Recent advancements in EMC testing for high-voltage equipment include:
Smart High-Voltage Switchgear
Research has been conducted on EMC test methods for smart high-voltage switchgear, focusing on conduction emission test methods and rectification schemes[5].
High-Voltage AC Power Systems in EMC Testing
High-voltage AC power systems are being used to simulate various
electromagnetic interferences in actual working environments, providing stable testing power sources and constructing complex testing scenarios[8].
In conclusion, the relationship between EMC and high voltage/high current systems continues to evolve, with new challenges arising from smart grid technologies and electric vehicles. Ongoing research focuses on developing more effective shielding, filtering, and testing methods to ensure the reliable
operation of these critical systems in increasingly complex electromagnetic environments.
Citations:
[1] https://onlinelibrary.wiley.com/doi/10.1155/2022/9256401 [2] https://www.mdpi.com/1996-1073/16/1/293
[3] https://pure.tue.nl/ws/portalfiles/portal/3594825/336248.pdf [4] https://interferencetechnology.com/case-studies-emi-filters/
[5] https://www.e-cigre.org/publications/detail/ish2017-215-research-on- electromagnetic-compatibility-test-of-smart-high-voltage-switchgear.html [6]
https://www.researchgate.net/publication/348204283_Electromagnetic_compati bility_of_high_voltage_substation_SMART_devices
[7] https://phst.kaznu.kz/index.php/journal/article/download/198/209/469 [8] https://en.teslamanhv.com/show-15-547-1.html
