By sion932 
In complex power systems, various components interact with each other, sometimes resulting in seemingly “small” phenomena that can have consequences that cannot be ignored. Today, let’s talk about the topic of “series resonance“.
What is series resonance?
Simply put, series resonance refers to the phenomenon in a series circuit consisting of an inductor (L), a capacitor (C), and a resistor (R), where the impedance is minimized and the current is maximized when the inductance (XL) and capacitance (XC) of the circuit are equal. At this point, the circuit enters a resonant state, just like a tuning fork that produces a specific frequency sound when struck, some components in the power system will also generate excessive current or voltage at a specific frequency.
Factors affecting series resonance
System frequency (f): This is the most direct factor, as changes in frequency directly affect the inductive and capacitive reactance.
Inductance value (L): The larger the inductance, the greater its reactance.
Capacitance value (C): The larger the capacitance, the smaller its capacitance impedance.
The distribution of inductance and capacitance: On transmission lines, inductance and capacitance are not concentrated, but distributed, and the characteristics of this distribution can also affect the occurrence of resonance.
Load characteristics: The nature of the load (inductive, capacitive, or resistive) can also affect resonance.
Tools for identifying and utilizing series resonance
To analyze and solve the problem of series resonance, some professional tools are essential. For example, power system analysis software can simulate system behavior under different operating conditions, helping us identify potential resonance risks. Oscilloscopes and spectrum analyzers can also be used to monitor and measure voltage and current waveforms in circuits, in order to determine the presence of resonance.
our has rich experience in the research and application of related power equipment and technology. Its professional products and solutions can effectively help power practitioners cope with technical problems such as series resonance.
How can we do better?
To better manage and avoid series resonance, we can start from the following aspects:
Accurate measurement of system parameters: Accurately mastering parameters such as inductance and capacitance in the system is the foundation of analysis.
Reasonable system design: During the planning and design phase of the power grid, fully consider the possibility of resonance, and avoid it by optimizing line parameters, configuring damping measures, etc.
Effective resonance suppression device: Depending on the specific situation, suitable dampers, filters, and other devices can be installed to suppress resonance.
Strengthen monitoring and diagnosis: Utilize advanced monitoring technology to monitor the real-time operation status of the power grid and detect any signs of resonance in a timely manner.
we has a profound accumulation in the field of ultra-high voltage transmission technology. Its high-voltage electrical equipment and technical services can provide strong support for improving the reliability of power grid operation and effectively addressing complex challenges such as series resonance.