Method and control system for controlling a power converter

A computer program including computer-executable components which when executed by processing circuitry of a control system causes the control system to perform the steps of:

• determining a frequency control error with respect to a setpoint frequency (fset) and an actual frequency (fact) of the power converter,
• determining an input power to an inertia model of a synchronous generator based on the frequency control error, which inertia model mimics the inertia of a synchronous generator,
• regulating by means of the input power a rotational frequency (f) of the inertia model,
• determining a voltage control error with respect to a setpoint voltage (Uset) and an actual voltage (Uact) output by the power converter,
• determining an exciter parameter of a synchronous generator model based on the voltage control error,
• regulating by means of the exciter parameter an output voltage (U) of the synchronous generator model, and
• controlling the power converter based on the rotational frequency or a phase angle (θ) obtained from the rotational frequency and based on the output voltage (U),
• wherein characteristics of the control system are changed adaptively in real time to make the power converter mimic characteristics of conventional generators to enhance the ability to maintain synchronism during line faults.

A control system for controlling a power converter configured to connect to an electrical grid and mimic a synchronous generator, wherein the control system includes:

• processing circuitry, and
• a storage medium including computer-executable components which when run on the processing circuitry causes the control system to:
• determine a frequency control error with respect to a setpoint frequency (fset) and an actual frequency (fact) of the power converter,
• determine an input power to an inertia model of a synchronous generator based on the frequency control error, which inertia model mimics the inertia of a synchronous generator,
• regulate by means of the input power a rotational frequency (f) of the inertia model,
• determine a voltage control error with respect to a setpoint voltage (Uset) and an actual voltage (Uact) output by the power converter,
• determine an exciter parameter of a synchronous generator model based on the voltage control error,
• regulate by means of the exciter parameter an output voltage (U) of the synchronous generator model, and
• control the power converter based on the rotational frequency or a phase angle (θ) obtained from the rotational frequency and based on the output voltage (U),
• wherein characteristics of the control system are changed adaptively in real time to make the power converter mimic characteristics of conventional generators to enhance the ability to maintain synchronism during line faults.

A power converter system including:

• a power converter, and
• a control system for the power converter, the power converter being configured to connect to an electrical grid and mimic a synchronous generator, wherein the control system includes:
• processing circuitry, and
• a storage medium including computer-executable components which when run on the processing circuitry causes the control system to:
• determine a frequency control error with respect to a setpoint frequency (fset) and an actual frequency (fact) of the power converter,
• determine an input power to an inertia model of a synchronous generator based on the frequency control error, which inertia model mimics the inertia of a synchronous generator,
• regulate by means of the input power a rotational frequency (f) of the inertia model,
• determine a voltage control error with respect to a setpoint voltage (Uset) and an actual voltage (Uact) output by the power converter,
• determine an exciter parameter of a synchronous generator model based on the voltage control error,
• regulate by means of the exciter parameter an output voltage (U) of the synchronous generator model, and
• control the power converter based on the rotational frequency or a phase angle (θ) obtained from the rotational frequency and based on the output voltage (U),
• wherein characteristics of the control system are changed adaptively in real time to make the power converter mimic characteristics of conventional generators to enhance the ability to maintain synchronism during line faults.