Citroen C Zero Traction Currents

This research investigates the characteristics of traction currents of a Citroën
C-Zero. The battery pack consists of 88 cells connected in series with a nominal
cell capacity of 50Ah. We characterized the amplitude variations, the frequency
content, and temporal patterns of traction currents during six driving
scenarios:

1. Parking mode: Vehicle stationary with auxiliary systems active
2. Acceleration: High acceleration from standstill to approximately 50km/h
3. Regenerative braking: Controlled deceleration from approximately 50km/h to
standstill
4. Constant velocity: Steady--state driving at approximately 25km/h
5. Urban driving: Moderate acceleration and deceleration patterns
6. Dynamic driving: High-performance driving with rapid acceleration and
deceleration

A Hioki 3275 current clamp, featuring a bandwidth of 2MHz, was connected to the
high-voltage cable near to the traction inverter input to record the current.
The output signal from the current clamp was measured using a PicoScope 5444D
oscilloscope at sample frequencies ranging from 50kHz to 20MHz. Positive
currents indicate battery discharge (acceleration), while negative currents
represent battery charge (recuperation).

Battery-powered traction applications convert electrical energy into mechanical
energy for propulsion, e.g. electric vehicles (EVs). A critical component of
this systems is the traction inverter, which converts the dc battery voltage
into an ac control signal, generating the rotating magnetic field into the
electric motor. In EVs, traction inverters operate at switching frequencies
ranging from 5 to 20kHz. The frequency of the electric motor control signal
depends on the velocity of the EV. As the velocity increases, the motor's
mechanical rotational frequency also increases, requiring a higher motor control
frequency.

Short-time Fourier transform (STFT) analysis revealed the temporal evolution of
electrical frequencies below 1 kHz, corresponding to motor control signals that
vary with vehicle velocity. The fundamental pulse width modulation (PWM)
switching frequency was identified at 7.1 kHz, with associated harmonics and
intermodulation products clearly visible in the frequency spectra.

For detailed information about data structure, experimental protocols, and data
processing methodologies, refer to the README.md file included with the dataset.