US 10,951,032 B2 · Multi-level medium voltage data center static synchronous compensator (DCSTATCOM) for active and reactive power control of data centers connected with grid energy storage and smart

Abstract

Systems and methods for supplying power (both active and reactive) at a medium voltage from a DCSTATCOM to an IT load without using a transformer are disclosed. The DCSTATCOM includes an energy storage device, a two-stage DC-DC converter, and a multi-level inverter, each of which are electrically coupled to a common negative bus. The DC-DC converter may include two stages in a bidirectional configuration. One stage of the DC-DC converter uses a flying capacitor topology. The voltages across the capacitors of the flying capacitor topology are balanced and switching losses are minimized by fixed duty cycle operation. The DC-DC converter generates a high DC voltage from a low or high voltage energy storage device such as batteries and/or ultra-capacitors. The multi-level, neutral point, diode-clamped inverter converts the high DC voltage into a medium AC voltage using a space vector pulse width modulation (SVPWM) technique.

Claims18

Dependent claims

A transformerless static synchronous compensator for an electrical load, comprising:

an energy storage device;
a two-stage bi-directional direct current (DC)-DC converter coupled to the energy storage device, wherein when the energy storage device is discharged, the stages of the two-stage bi-directional DC-DC converter operate to step up a voltage in two steps, and when the energy storage device is charged, the stages of the two-stage bi-directional DC-DC converter operate to step down the voltage in two steps;
a multi-level inverter that outputs a medium alternating current (AC) inverter voltage, the multi-level inverter coupled to the two-stage bi-directional DC-DC converter and a point of common coupling (PCC);
and
a controller configured to control a magnitude of the medium AC inverter voltage of the multi-level inverter to generate or absorb reactive power to achieve a power factor equal to or approximately equal to unity at the PCC.

2 more elements

A method for supplying power from a transformerless static synchronous compensator to an electrical load when an interruption in power occurs, the method comprising:

supplying a first direct current (DC) voltage from a low voltage energy storage device to a two-stage bi-directional DC-DC converter;
converting, by the two-stage bi-directional DC-DC converter, the first DC voltage from the low voltage energy storage device into a second DC voltage;
generating, by a multi-level inverter, an alternating current (AC) inverter voltage from the second DC voltage, wherein the AC inverter voltage is a medium voltage less than the second DC voltage;
providing the AC inverter voltage to a point of common coupling (PCC);
and
controlling the AC inverter voltage of the multi-level inverter to generate or absorb reactive power to achieve a power factor at the PCC equal to or approximately equal to unity,
wherein when the energy storage device is discharged, the stages of the two-stage DC-DC converter operate to step up a voltage in two steps, and when the energy storage device is charged, the stages of the two-stage DC-DC converter operate to step down the voltage in two steps.

4 more elements

Dependencies are inferred from the claim text.

Multi-level medium voltage data center static synchronous compensator (DCSTATCOM) for active and reactive power control of data centers connected with grid energy storage and smart

Life of this patent

Multi-level medium voltage data center static synchronous compensator (DCSTATCOM) for active and reactive power control of data centers connected with grid energy storage and smart

Life of this patent

Abstract

Claims18