US 12,169,227 B2
Testing device and testing method for power converters
Akito Nakayama, Tokyo (JP); Yuki Ishii, Tokyo (JP); and Takuya Kajiyama, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/762,374
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 12, 2019, PCT No. PCT/JP2019/044417
§ 371(c)(1), (2) Date Mar. 22, 2022,
PCT Pub. No. WO2021/095141, PCT Pub. Date May 20, 2021.
Prior Publication US 2022/0397616 A1, Dec. 15, 2022
Int. Cl. G01R 31/56 (2020.01); H02M 1/00 (2007.01); H02M 3/335 (2006.01); H02M 7/483 (2007.01); H02M 7/5387 (2007.01)
CPC G01R 31/56 (2020.01) [H02M 1/0016 (2021.05); H02M 7/483 (2013.01); H02M 7/53871 (2013.01); H02M 3/33573 (2021.05); H02M 3/33592 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A testing device for a power converter including a series connection of first and second main switching elements connected in series through a first terminal, and a first power storage element connected in parallel with the series connection of the first and second main switching elements, the testing device comprising:
an auxiliary converter including a series connection of first and second auxiliary switching elements connected in series through a second terminal, and a second power storage element connected in parallel with the series connection of the first and second auxiliary switching elements;
a line configured to electrically connect the power converter and the auxiliary converter,
a current output circuit connected to the first and second terminals, the current output circuit outputting test current for the power converter in accordance with a reference current command value in which an alternating current (AC) current command value and a direct current (DC) current command value are superimposed; and
a control circuit to control the current output circuit, the power converter, and the auxiliary converter, wherein the control circuit
executes circulation operation to fix ON and OFF of the first and second main switching elements and the first and second auxiliary switching elements such that a current path bypassing the first and second power storage elements is formed between the first and second terminals until a DC component of the test current reaches a predetermined level, after start of output of the test current from the current output circuit in accordance with the reference current command value, and starts ON and OFF control of the first and second main switching elements and the first and second auxiliary switching elements for voltage control at least including control of voltages of the first and second power storage elements in accordance with a power storage element voltage command value, after the DC component reaches the predetermined level.