Abstract: The present invention discloses a DC converter valve state detection method based on temporal features of converter terminal currents, including the following steps: collecting three-phase AC currents on a converter valve-side of a DC transmission system; defining a current when the currents of two commutating valves are equal as a base value, greater than the base value as a valve conducting current, and less than the base value as a valve blocking current; constructing a valve conducting state by a relative relationship among amplitudes of the three-phase AC currents, and calculating a time interval of each valve conducting state; comparing time intervals of 6 valve conducting states with a time interval of a valve conducting state in normal operation, and determining whether the 6 valve states are normal according to the result of comparison and locating all abnormal valves. The present invention can reliably detect valve states and locate abnormal valves through sequence detection.

Abstract: The present invention discloses a calculation method for a converter valve state and a valve current based on temporal features of a valve side current, the process is follows: collecting three-phase AC currents, DC currents on a valve side of a converter of a DC transmission system, and trigger pulses of converter valves; establishing a node current equation of the AC currents and valve currents; when detecting a rising edge of a trigger pulse of a converter valve, latching the number of the converter valve; according to the trigger pulses of the converter valves, and amplitude characteristics of the AC currents and characteristics of AC variations, to perform a conducting state and a blocking state judgment of valve states, and obtaining valve states; judging whether each phase has a bypass state; through summing the valve bypass states of the three phases to judge a number of bypass phases; supplementing bypass loop voltage equation; calculating the converter valve currents; when the calculated value of th

Abstract: The present invention discloses a DC converter valve state detection method based on temporal features of converter terminal currents, including the following steps: collecting three-phase AC currents on a converter valve-side of a DC transmission system; defining a current when the currents of two commutating valves are equal as a base value, greater than the base value as a valve conducting current, and less than the base value as a valve blocking current; constructing a valve conducting state by a relative relationship among amplitudes of the three-phase AC currents, and calculating a time interval of each valve conducting state; comparing time intervals of 6 valve conducting states with a time interval of a valve conducting state in normal operation, and determining whether the 6 valve states are normal according to the result of comparison and locating all abnormal valves. The present invention can reliably detect valve states and locate abnormal valves through sequence detection.

Abstract: The invention discloses a commutation failure protection method, and apparatus, computer device and storage medium thereof.

Abstract: A hybrid vehicle, an air conditioning system and a method for controlling the air conditioning system are provided. The air conditioning system includes: an electric compressor; a mechanical compressor, connected with the electric compressor in parallel; a power battery, connected with the electric compressor and configured to supply power to the electric compressor; an engine, connected with the mechanical compressor and configured to supply a power source to the mechanical compressor; an engine controller, connected with the engine and configured to start the engine when the mechanical compressor is to be started; a battery manager, connected with the power battery and configured to detect a state of charge of the power battery; and a controller, connected with the engine controller and the battery manager and configured to start the electric compressor and the mechanical compressor at different time according to the state of charge of the power battery.

Abstract: A hybrid vehicle, an air conditioning system and a method for controlling the air conditioning system are provided. The air conditioning system includes: an electric compressor; a mechanical compressor, connected with the electric compressor in parallel; a power battery, connected with the electric compressor and configured to supply power to the electric compressor; an engine, connected with the mechanical compressor and configured to supply a power source to the mechanical compressor; an engine controller, connected with the engine and configured to start the engine when the mechanical compressor is to be started; a battery manager, connected with the power battery and configured to detect a state of charge of the power battery; and a controller, connected with the engine controller and the battery manager and configured to start the electric compressor and the mechanical compressor at different time according to the state of charge of the power battery.

Abstract: This invention relates to a system for penetrating the uterus of an animal during a non-surgical procudure, the uterus having a cervix leading to a uterus body. The system comprises a probe having a long tubular body with a central longitudinal axis, open forward and rearward ends, and a probing member projecting forward and laterally outward beyond the forward end of the probe body. The probe is inserted, forward end first, inside the cervix of said animal, and the probe body is manipulated to gently maneuver the probing member in a forward direction through the cervix to a position in which the probing member and the forward open end of the probe body are adjacent the body of the uterus.

Abstract: The invention involves a system for effecting the nonsurgical transplant of embryos into the uterus of an animal. The system comprises (1) a long tubular gripping instrument having an open forward end configured for gripping the walls of the cervix of the uterus when the instrument is inserted to a position inside the cervix, and (2) a probe having a long tubular body which extends through the tubular gripping instrument, the probe being manipulatable to effect movement of the probe relative to the gripping instrument to facilitate passage of the probe and the gripping instrument through the cervix to a position generally adjacent the body of the uterus, and (3) an embryo carrier for carrying one or more embryos to be placed in the uterus of the animal. The embryo carrier is sized for insertion in and through the tubular probe to an embryo release position for release of the embryos into the uterus.

Abstract: This invention is directed to a method of effecting the non-surgical transplant of embryos into the uterus of an animal. The method involves the use of a long tubular gripping instrument having an open forward end and an external gripping formation generally adjacent its forward end. A probe with a long tubular body having an open forward end extends axially inside the gripping instrument. A probing member projects in a generally non-axial direction from the probe body generally adjacent its forward end. The method comprises the steps of inserting the gripping instrument, forward end first, into a cervix of the uterus, and establishing a grip between the walls of the cervix and the external gripping formation on the gripping instrument. While maintaining said grip, the gripping instrument is pulled in a rearward direction to straighten the cervix.