Direct current stabilization power supply system

Patent metadata

Field	Value
Publication number	US-10766630-B2
Application number	US-201615736963-A
Country	US
Kind code	B2
Filing date	Jun 15, 2016
Priority date	Jun 15, 2015
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

A first DC power supply section of a DC stabilization power supply system includes at least a generator and a PWM converter. A second DC power supply section of the DC stabilization power supply system includes at least a battery and a boost converter. Each of these DC power supply sections performs a power supply stabilization operation for supplying DC power to an electric system and absorbing regenerative power generated from an actuator or the like. A PWM converter controls adjustment of the amount of the power supply stabilization operation to be performed by the DC power supply section and the amount of the power stabilization operation to be performed by the DC power supply section, by changing a target voltage value of a DC bus.

First claim

The invention claimed is:

1. A direct current stabilization power supply system, comprising:
an electric system including a direct current bus and an electric device connected to the direct current bus;
an alternating current power supply and a direct current power supply which supply electric power to the electric system;
a charging/discharging control section which is connected to the direct current power supply and the direct current bus and controls charging and discharging amounts of the direct current power supply;
a power conversion section which is connected to the charging/discharging control section, the alternating current power supply, and the direct current bus, and bidirectionally converts alternating current power and direct current power; and
a first direct current power supply section including at least the alternating current power supply and the power conversion section, and a second direct current power supply section including at least the direct current power supply and the charging/discharging control section, the first direct current power supply section and the second direct current power supply section being operative as a direct current power supply section which performs a power supply stabilization operation for supplying the direct current power to the electric system and absorbing regenerative power generated from the electric device,
wherein the power conversion section is configured to control adjustment of an amount of the power supply stabilization operation to be performed by the first direct current power supply section and an amount of the power supply stabilization operation to be performed by the second direct current power supply section, by changing a target value of a voltage of the direct current bus.

2. The direct current stabilization power supply system according to claim 1 ,
wherein the power conversion section is configured to control adjustment of the amount of the power supply stabilization operation to be performed by the first direct current power supply section and the amount of the power supply stabilization operation to be performed by the second direct current power supply section, by controlling the voltage of the direct current bus by a proportional-integral control, and
wherein the charging/discharging control section is configured to control the charging and discharging amounts by a proportional control.

3. The direct current stabilization power supply system according to claim 2 ,
wherein the power conversion section includes:
a power conversion circuit connected to the alternating current power supply;
an alternating current voltage detection section which detects an alternating current voltage of the alternating current power supply;
an alternating current detection section which detects an alternating current of the alternating current power supply;
a direct current voltage detection section which detects a direct current voltage of the electric system; and
a power conversion control section which drives the power conversion circuit based on the alternating current voltage which is detected, the alternating current which is detected, and the direct current voltage which is detected,
wherein the power conversion control section is configured to calculate active power of the alternating current power supply, based on the alternating current voltage which is detected and the alternating current which is detected,
wherein the power conversion control section is configured to calculate a direct current voltage command value based on the active power and operation information of the alternating current power supply,
wherein the power conversion control section is configured to calculate an alternating current command value based on the direct current voltage command value and the direct current voltage which is detected, by the proportional-integral control, and
wherein the power conversion control section is configured to control the power conversion circuit by use of the alternating current command value.

4. The direct current stabilization power supply system according to claim 3 ,
wherein the power conversion control section is configured to calculate a phase of the alternating current power supply based on the alternating current voltage which is detected, and
wherein the power conversion control section is configured to control the power conversion circuit based on the alternating current command value, the alternating current which is detected, and the phase.

5. The direct current stabilization power supply system according to claim 2 ,
wherein the charging/discharging control section includes:
a voltage regulation circuit connected to the direct current power supply;
a direct current power supply monitoring section which monitors a state of charge of the direct current power supply and a cell temperature of the direct current power supply;
a direct current voltage detection section which detects a direct current voltage of the electric system;
a direct current detection section which detects a direct current of the electric system; and
a direct current voltage control section which drives the voltage regulation circuit, based on the state of charge of the direct current power supply, the direct current voltage which is detected, and the direct current which is detected,
wherein the direct current voltage control section is configured to calculate a compensation voltage of the state of charge, based on the state of charge of the direct current power supply,
wherein the direct current voltage control section is configured to calculate a direct current command value based on the compensation voltage of the state of charge, and the direct current voltage which is detected, by the proportional control, and
wherein the direct current voltage control section is configured to control the voltage regulation circuit, by use of the direct current command value and the direct current which is detected.

6. The direct current stabilization power supply system according to claim 5 ,
wherein the direct current voltage control section is configured to calculate the direct current command value based on the compensation voltage of the state of charge and the direct current voltage which is detected, by performing a derivative control concurrently with the proportional control.

7. The direct current stabilization power supply system according to claim 1 ,
wherein a voltage change range within which the power conversion section performs a control and a voltage change range within which the charging/discharging control section performs a control are preset to different ranges,
wherein the power conversion section is configured to control adjustment of the amount of the power supply stabilization operation to be performed by the first direct current power supply section and the amount of the power supply stabilization operation to be performed by the second direct current power supply section, by a proportional-integral control, and

wherein the charging/discharging control section is configured to control the charging and discharging amounts, by the proportional-integral control.

8. The direct current stabilization power supply system according to claim 7 ,
wherein the power conversion section includes:
a power conversion circuit connected to the alternating current power supply;
an alternating current voltage detection section which detects an alternating current voltage of the alternating current power supply;
an alternating current detection section which detects an alternating current of the alternating current power supply;
a direct current voltage detection section which detects a direct current voltage of the electric system; and
a power conversion co

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Iwashima Atsushi
• Sugimoto Kazushige
• Yamaguchi Jun
• Takayama Suguru

Classifications

• H02J2105/33

  exchanging power with road vehicles · CPC title

• H02J2105/32

  for aircrafts · CPC title

• H02J3/32

  using batteries or super capacitors with converting means · CPC title

• H02J1/14

  Balancing load and power generation in DC networks · CPC title

• B64D41/00 Primary

  Power installations for auxiliary purposes · CPC title