The core of IN-Power Electric's regenerative braking power utilization device is a set of multi-level inverters, which inverts the regenerative braking energy of the rail DC OHE and feeds it back to the AC grid. At the same time, it has the functions of reactive power and harmonic compensation.

Main product functions

■ Feedback of braking energy

　♦ The grid-connected waiting state maintains a high response speed

　♦ Cooperate with the droop characteristics of traction converter to avoid conflict with it;

　♦ When greater than the full load feedback threshold voltage, full power feedback is used to ensure the safety of the DC OHE;

■ Reactive compensation

The reactive compensation can be automatically performed according to the voltage and current of the 35kV incoming line, and the power factor is always 1; it can also be compensated by a given reactive power in the background of the upper computer to improve the power factor of the 220kV substation and reduce the charge reactive power of the cable.

■ Active filter

INPEFS has the ability to filter the 5th, 7th, 11th, 13th and 19th harmonics, and can realize single harmonic compensation rate of over 95%

Product composition

■ DC control cabinet

Built-in DC contactor, soft start contactor, soft start resistor, controller, meter and human-machine interface.

■Inverter cabinet

Each side of the inverter cabinet contains three sets of power units with a rated capacity of 1 MW.

■AC switch cabinet

Built-in universal circuit breaker.

Technical parameters

♦ Rated system voltage: DC750V, DC1500V;

♦ Feedback power: 0-4MW;

♦ Working mode of the device: intermittent, with a typical working cycle of 120s. The short-time maximum absorption power lasts for 30s, while the rest 90s is in no-load operation.

♦ System response time: 0-100% full load feedback response time is 20ms;

♦ Frequency tracking: automatic tracking of the frequency and phase of the medium-voltage grid, and no phase difference in the range of 47.5-52.5Hz;

♦ AC side harmonic index: THD ≤ 22%;

♦ Complete device efficiency: ≥0.98;

♦ Noise: ≤65dB;

Standardized product selection table

Product name	Product model	Cabinet size (WDH) (mm)
INPEFS regenerative braking power utilization device	INPEFS-1000/1500- □	240012002200
INPEFS regenerative braking power utilization device	INPEFS-2000/1500- □	360012002200
INPEFS regenerative braking power utilization device	INPEFS-3000/1500- □	540012002200
INPEFS regenerative braking power utilization device	INPEFS-4000/1500- □	660012002200
INPEFS regenerative braking power utilization device	INPEFS-1000/750- □	340012002200
INPEFS regenerative braking power utilization device	INPEFS-2000/750- □	560012002200
INPEFS regenerative braking power utilization device	INPEFS-3000/750- □	840012002200

♦ Note: 1. The step-up transformer is not within the above size range. The output voltage is different depending on the voltage level of the access grid.

　　　　2. Please consult our technical personnel for other other capacity.

Module introduction

■ Introduction to power module

♦ Select Infineon's high-power IGBT module

♦ High reliability film capacitor, laminated busbar design and perfect protection function

♦ Achieve the electrical isolation between the main circuit and the control circuit through optical fiber communication, which is safe and reliable

■ Introduction to filter module

♦ Split design with power module for weight sharing and easy maintenance.

♦ High-power high-frequency soft magnetic reactance filter with low loss and strong filtering ability

♦ High-breaking vacuum contactor for quick removal of faulty units

Product advantages

♦ Unique technical solutions

♦ Module parallel ripple cancellation technology

♦ Multi-module current sharing and circulation suppression technology

♦ Control algorithm for suppressing grid-connected impact and system resonance

♦ Energy bidirectional control

♦ Both braking energy feedback and PWM rectification power supply

The OHE dynamic detection device

High-voltage AC filter device