US 12,289,076 B2
Method of controlling power generation apparatus and pumped storage power generation apparatus
Masahiro Yoshida, Tokyo (JP)
Assigned to HITACHI MITSUBISHI HYDRO CORPORATION, Tokyo (JP)
Appl. No. 18/024,467
Filed by HITACHI MITSUBISHI HYDRO CORPORATION, Tokyo (JP)
PCT Filed Sep. 11, 2020, PCT No. PCT/JP2020/034601
§ 371(c)(1), (2) Date Mar. 2, 2023,
PCT Pub. No. WO2022/054260, PCT Pub. Date Mar. 17, 2022.
Prior Publication US 2023/0327589 A1, Oct. 12, 2023
Int. Cl. H02P 9/10 (2006.01); F03B 1/00 (2006.01); H02P 101/10 (2015.01)
CPC H02P 9/107 (2013.01) [F03B 1/00 (2013.01); F05B 2220/706 (2013.01); F05B 2270/1033 (2013.01); H02P 2101/10 (2015.01)] 3 Claims
OG exemplary drawing
 
1. A method of controlling a pumped storage power generation apparatus, the method comprising:
controlling the pumped storage power generation apparatus to operate in a power generation operation or a pumping operation, wherein the pumped storage power generation apparatus comprises i) a turbine and ii) a generator, wherein the generator comprises a rotor, wherein the generator is synchronously connected to a utility grid, wherein the turbine is directly connected to the rotor of the generator, and wherein the turbine is configured to drive the rotor of the generator in the power generation operation and further configured to be driven by the rotor of the generator in the pumping operation;
calculating, using a rotational speed controller, a guide vane opening degree command based on a difference between i) a reference rotational speed corresponding to a utility grid frequency and ii) an actual rotational speed of the rotor of the generator, wherein the rotational speed controller includes a proportional control element, an integral control element, and a differential control element;
providing, to the turbine, the guide vane opening degree command to control a guide vane in the turbine; and
performing speed control during the power generation operation based on the guide vane opening degree command provided to the turbine,
wherein the integral control element of the rotational speed controller includes an anti-windup circuit and an integral control function,
wherein the anti-windup circuit includes a first upper limit limiting function and a second upper limit limiting function,
wherein an output value of the first upper limit limiting function is determined based on an output signal of a load limiter of the pumped storage power generation apparatus,
wherein an output value of the second upper limit limiting function is determined based on the difference between i) the reference rotational speed corresponding to the utility grid frequency and ii) the actual rotational speed of the rotor of the generator,
wherein the output value of the second upper limit limiting function varies within a predetermined range,
wherein, when the actual rotational speed of the rotor of the generator exceeds the reference rotational speed corresponding to the utility grid frequency, an output of the guide vane opening degree command generated by an output value of the integral control function is restricted,
wherein a difference between i) the output value of the integral control function and ii) an output value of the anti-windup circuit is fed back to an input of the integral control function so that the difference between i) the reference rotational speed corresponding to the utility grid frequency and ii) the actual rotational speed of the rotor of the generator is reduced based on the difference between i) the output value of the integral control function and ii) the output value of the anti-windup circuit to forcibly reduce the output value of the integral control function, and
wherein the output value of the anti-windup circuit is determined by multiplying the output value of the first upper limit limiting function by the output value of the second upper limit limiting function.