US 11,811,217 B2
Fault protection apparatus and photovoltaic power generation system
Dong Chen, Shanghai (CN); Lei Shi, Shanghai (CN); and Jun Wang, Shanghai (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Jan. 25, 2022, as Appl. No. 17/584,102.
Application 17/584,102 is a continuation of application No. PCT/CN2021/141683, filed on Dec. 27, 2021.
Claims priority of application No. 202110069765.0 (CN), filed on Jan. 19, 2021.
Prior Publication US 2022/0231499 A1, Jul. 21, 2022
Int. Cl. H02M 1/32 (2007.01); H02H 7/122 (2006.01); H02J 3/00 (2006.01); H02H 3/38 (2006.01); H02M 7/487 (2007.01)
CPC H02H 7/122 (2013.01) [H02H 3/38 (2013.01); H02J 3/001 (2020.01); H02M 1/32 (2013.01); H02J 2300/24 (2020.01); H02M 7/487 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A photovoltaic power generation system, wherein the photovoltaic power generation system comprises:
a capacitor bridge arm, wherein the capacitor bridge arm comprises a positive electrode output port, a negative electrode output port, and a reference output port between the positive electrode output port and the negative electrode output port;
an inverter bridge arm, wherein the inverter bridge arm comprises a positive electrode input port, a negative electrode input port, and a reference input port between the positive electrode input port and the negative electrode input port, the positive electrode input port is connected to the positive electrode output port, and the negative electrode input port is connected to the negative electrode output port; and
a fault protection apparatus, wherein the fault protection apparatus is connected between the reference input port and the reference output port, and the fault protection apparatus is turned off based on a magnitude value or a variation of a voltage between the reference input port and the positive electrode input port or between the reference input port and the negative electrode input port, or a magnitude value or a variation of a current between the reference input port and the positive electrode input port or between the reference input port and the negative electrode input port,
wherein the fault protection apparatus comprises a primary circuit breaker, the primary circuit breaker comprises a first switch transistor and a second switch transistor, the first switch transistor and the second switch transistor are connected in series in reverse directions between the reference output port and the reference input port, and the fault protection apparatus is turned on and turned off through controlling on and off states of the first switch transistor and the second switch transistor,
wherein the fault protection apparatus further comprises a varistor,
wherein the varistor and the primary circuit breaker are connected in parallel between the reference output port and the reference input port,
wherein the fault protection apparatus further comprises a high-speed mechanical breaker, and
wherein the high-speed mechanical breaker, the varistor, and the primary circuit breaker are connected in parallel between the reference output port and the reference input port, the high-speed mechanical breaker is turned on after the first switch transistor and the second switch transistor of the primary circuit breaker are turned on, and the high-speed mechanical breaker is turned off before the first switch transistor and the second switch transistor.