Power generation system including wind power generation and solar thermal power generation

Patent metadata

Field	Value
Publication number	US-9903344-B2
Application number	US-201514614599-A
Country	US
Kind code	B2
Filing date	Feb 5, 2015
Priority date	Aug 7, 2012
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

Electric power obtained by wind power generation is used effectively. A power generation system in an embodiment includes: a wind power generation apparatus; a solar thermal power generation apparatus; and an electrothermal converting unit. The solar thermal power generation apparatus includes: a heater heating a heating medium by solar heat; and a heat exchanger exchanging heat of the heating medium heated by the heater and heat of a working fluid to operate a drive mechanism of a power generator. The electrothermal converting unit converts part of electric power generated by the wind power generation apparatus into heat to heat the heating medium.

First claim

What is claimed is:

1. A power generation system, comprising:
a wind power generation apparatus;
a solar thermal power generation apparatus including:
a heater heating a heating medium by solar heat; and
a heat exchanger exchanging heat of the heating medium heated by the heater and heat of a working fluid to operate a drive mechanism of a power generator;

an electrothermal converting unit; and
a controller that divides electric power generated by the wind power generation apparatus into a first electric power component and a second electric power component other than the first electric power component,
wherein the first electric power component comprises a high-frequency component having a frequency higher than a predetermined frequency,
wherein the controller provides the first electric power component to the electrothermal converting unit and provides the second electric power component to an electric distribution system at the same time as the providing the first electric power component, and the electrothermal converting unit converts the first electric power component into heat to heat the heating medium.

2. The power generation system according to claim 1 ,
wherein the electrothermal converting unit includes:
an electric heater;
an electric power converting section converting the first electric power component to electric power to drive the electric heater; and
an electric power conversion control section controlling an operation of the electric power converting section so that the high-frequency component of electric power generated by the wind power generation apparatus is converted into electric power to drive the electric heater, the electric power conversion control section including a high-pass filter.

3. The power generation system according to claim 2 ,
wherein in the high-pass filter, a time constant smaller than 1 minute is set.

4. The power generation system according to claim 1 ,
wherein the heater includes:
a mirror where sunlight is collected;
a pipe in which the heating medium is transferred; and
a mirror driving unit changing a relative orientation of the mirror with respect to the pipe,

the power generation system further comprising:
a heating medium circulation channel that includes the pipe as part of the heating medium circulation channel and in which the heating medium is circulated through the heater, the electrothermal converting unit, and the heat exchanger;
a temperature sensor detecting a temperature of the heating medium circulating in the heating medium circulation channel; and
a heating medium heating control unit controlling an operation of the mirror driving unit based on a detection result made by the temperature sensor.

5. The power generation system according to claim 4 , further comprising:
a heating medium transfer pump generating motive power to transfer the heating medium along the heating medium circulation channel,
wherein the heating medium heating control unit controls an operation of the heating medium transfer pump based on a detection result made by the temperature sensor.

6. A power generation system configured to include a wind power generation in which rotation of a windmill generates electric power, and a solar thermal power generation in which a heating medium used for power generation apparatus circulates in a pipe and is heated by heat collected by a solar heat collector, the power generation system comprising:
a smoothed electric power signal generation unit generating a smoothed electric power signal from wind power generated electric power obtained by the wind power generation;
a tower shadow effect electric power generation unit obtaining, based on the smoothed electric power signal generated by the smoothed electric power signal generation unit, a rotation speed of the windmill measured from the windmill, and previously stored data simulating rotation of blades of the windmill, a reduction amount of power generation output when one of the blades of the rotating windmill passes by a tower of the windmill and generating tower shadow effect electric power by subtracting the reduction amount from the smoothed electric power signal;
an envelope generation section generating an envelope connecting lower limit values of the wind power generated electric power fluctuating for a short term based on the tower shadow effect electric power generated by the tower shadow effect electric power generation unit and the smoothed electric power signal output by the smoothed electric power signal generation unit;
a short-term fluctuation component separation section separating a short-term fluctuation component from the wind power generated electric power in accordance with the envelope generated by the envelope generation section; and
an electric power converting section converting the short-term fluctuation component separated by the short-term fluctuation component separation section into electric power to drive a heater that heats the pipe for heating medium circulation.

7. The power generation system according to claim 6 ,
wherein the envelope generation section generates an envelope by subtracting an amplitude of the shadow effect electric power from an electric power signal obtained by adding the tower shadow effect electric power to the wind power generated electric power.

8. The power generation system according to claim 6 ,
wherein the tower shadow effect electric power generation unit includes: a tower shadow effect electric power calculation section that calculates timing at which the blade of the windmill goes behind the tower, calculates a torque reduction at the timing, and calculates a reduction amount of a power generation amount caused by the torque reduction.

9. The power generation system according to claim 6 ,
wherein the smoothed electric power signal generation unit includes:
a delay filter that delays the wind power generated electric power with a time constant of 1 second to 60 seconds to smooth the wind power generated electric power and outputs the smoothed electric power signal.

10. A power generation system comprising:
a wind power generation apparatus outputting first electric power generated by wind power to a first power transmission line;
a solar thermal power generation apparatus outputting second electric power generated by a working fluid heat exchanged with a heating medium heated by solar heat and a heater to a second power transmission line;
an inverter outputting electric power, being part of the first electric power, to the heater according to a first control signal;
an output control device adjusting output of the second electric power according to a second control signal and outputting the second electric power to the first power transmission line; and
a control device outputting, based on a wind power generation output signal obtained with respect to the first electric power, the first control signal to the inverter and outputting the second control signal to the output control device,
wherein the control device includes:
a high-pass filter extracting a high-frequency component signal contained in the wind power generation output signal;
a first control signal calculation unit calculating a signal obtained by extracting a positive component from the high-frequency component signal as the first control signal; and
a second control signal calculation unit calculating a signal obtained by extracting a negative component from the high-frequency component signal and inverting positive and negative as the second control signal.

11. The power generation system according to claim 10 ,
wherein the high-pass filter has a time constant smaller than 1 minute.

Assignees

• Toshiba Kk

Inventors

• Rodionov Mikhail
• Takagi Yasuo
• Okita Nobuo
• Takahata Kazuo
• Tone Yoichi
• Murayama Dai

Classifications

• Y02E10/465

  Cross-Sectional Technologies · mapped topic

• F03D9/18

  storing heat · CPC title

• F03D9/007

  the wind motor being combined with means for converting solar radiation into useful energy · CPC title

• F03D9/22 Primary

  the apparatus producing heat · CPC title

• H02P2101/15

  for wind-driven turbines · CPC title