Abstract: A combined direct current circuit breaker includes a transfer branch, an energy absorption branch, at least two primary branches and at least two secondary branches; the transfer branch is connected in parallel with the energy absorption branch; the primary branches are in one-to-one correspondence with the second branches; the primary branches are connected with direct current outgoing lines of a direct current busbar in a high-voltage direct current power transmission system; the secondary branches are connected in series with the transfer branches and then connected in parallel with two ends of the primary branches corresponding to the secondary branches.

Abstract: The present invention provides a direct current circuit breaker and its implementation method, which includes a cutout circuit, a commutation circuit and a energy absorption circuit connected in parallel. Through using power semiconductor switch module to cut off the current, it will have a quickly action, without generating electric arc, while the modular construction also reduces the consistency requirements of the power electronic component.

Abstract: A combined direct current circuit breaker includes a transfer branch, an energy absorption branch, at least two primary branches and at least two secondary branches; the transfer branch is connected in parallel with the energy absorption branch; the primary branches are in one-to-one correspondence with the second branches; the primary branches are connected with direct current outgoing lines of a direct current busbar in a high-voltage direct current power transmission system; the secondary branches are connected in series with the transfer branches and then connected in parallel with two ends of the primary branches corresponding to the secondary branches.

Abstract: The present invention relates to a basic function unit of voltage source converter, which is characterized in that the basic function unit includes a switching device function module, a by-pass function module, a switch protection function module, a secondary control and protection function module, and a energy storage unit. The secondary control and protection function module, the energy storage unit and the by-pass function module are all fixed on the motherboard, there is a slide rail at the bottom of the motherboard, the motherboard can move back and forth on the slide rail. The voltage source converter based on that unit is highly modular, insensitive to switch device parameters, lower output voltage change rate, and smaller dv/dt stress of equipment, smaller noise, without filter, convenient installation and maintenance.

Abstract: The present invention provides a direct current circuit breaker and its implementation method, which includes the cutout circuit, the commutation circuit and the energy absorption circuit connected in parallel, wherein the cutout circuit includes cutout inductance and cutout unit connected in series, the commutation circuit includes commutation inductance, commutation unit and mechanical switch connected in series, commutation unit has a smaller on-resistance compared to cutout unit. The direct current circuit breaker topology of the present invention is novelty, concise, fully functional, easy to control and can flexible extend to apply to different voltage occasion.

Abstract: This present invention provides a high power electronic device which is used for transforming the alternating current into the direct current, or transforming the direct current into the alternating current: a thyristor valve module, there are two same thyristor valve segments in the whole thyristor valve module; each segment includes saturated reactor, thyristor valve unit, direct current equalizing resistor unit, acquiring energy unit, damped resistor unit, damped capacitor unit, gate series unit and water cooling system. This device series connects the thyristor valves to meet different transmission powers and different voltage ranks. This device is the key element of the high voltage direct current transmission. It can be used for different voltage ranks AD transmission system and can also be used for different voltage ranks DC system, including the ultra-high voltage 800 kV and above system.

Abstract: The present invention relates to valve current control method based on modular multi-level converter, this method includes the control of the low frequency oscillations of the current and that of double frequency harmonic component; For said low frequency oscillations of the current, the control method includes some steps as below: first, calculate the half of the sum of the upper arm current and the lower arm current, it is the valve DC current component, said DC current component is arm circulating current; Secondly, comparing the actual value of the arm circulating current to setting value of that, the error is obtained, after some signal processing, additional output set voltage is obtained.

Abstract: The present invention relates to a basic function unit of voltage source converter, which is characterized in that the basic function unit includes a switching device function module, a by-pass function module, a switch protection function module, a secondary control and protection function module, and a energy storage unit. The secondary control and protection function module, the energy storage unit and the by-pass function module are all fixed on the motherboard, there is a slide rail at the bottom of the motherboard, the motherboard can move back and forth on the slide rail. The voltage source converter based on that unit is highly modular, insensitive to switch device parameters, lower output voltage change rate, and smaller dv/dt stress of equipment, smaller noise, without filter, convenient installation and maintenance.

Abstract: This present provides a control and protection equipment system suitable for synthesis converter operation test, relates to power system automation equipment field. This system includes human-machine interface element, synchronization element, signal acquisition element, data aggregation element, conditioning element, protecting element, wave form recording element, wave form monitor element, on-off input element, on-off output element, vale based element (VBE), high direct current supply power system controller, high voltage supply system controller, current surge circuit controller, impulse circuit controller, test converter valve water cooling controller and test equipment water cooling system controller. This system can control converter samples and auxiliary valves on set trigging timing, produce various operation tests need heat, voltage and current of the converter samples and carry through operation tests.

Abstract: The test method of this invention is comparatively simpler without high voltages in normal default current tests, high voltages have been replaced by impulse generator employing positive and negative symmetrical voltages mixed with impulse voltages to form asymmetrical forward and reverse high voltages, meanwhile the timing for impulse voltage is flexible, the amplitudes could be continuously adjustable according to specific needs, to make test voltage exactly reach climax upon certain timing, the test is flexible and safe, to be applied to converter valves in different direct currents.

Abstract: This invention provides a high voltage thyristor valve multi-injection test method, it can meet one way valve and double valve operation test and over current test requirements. It has high equivalence and good flexibility. It includes FACTS double way thyristor valve and normal direct current thyristor valve operation tests and over current test. This method is novel, flexible, can carry out many different test and their mixture test and including the high voltage thyristor valve different tests.

Abstract: The present invention relates to a self-cooled thyistor device for ultra-high voltage fault current limiter. a self-cooled thyristor valve, it adopts horizontal structure consisted by frames, frames is divided into upper and below two spaces by crossbeams, the bottom of frames is supported by insulators. There is a cross plate between two vertical said frames, the cross plate mounts resistors connect with a high potential plate and capacitor through two wires. There is a thyistor string in said frame upper space, which is constituted of thyistors and cooler series. The thyistor string is compressed tightly by press-fit mechanism, thyistor string crosses current transformers. There are high potential plates on both sides of the thyistor, the number of the potential plates is equal to that of thyistor. One side of the high potential plates links frames, said current transformers connects with high potential plates.

Abstract: This present provides a control and protection equipment system suitable for synthesis converter operation test, relates to power system automation equipment field. This system includes human-machine interface element, synchronization element, signal acquisition element, data aggregation element, conditioning element, protecting element, wave form recording element, wave form monitor element, on-off input element, on-off output element, vale based element (VBE), high direct current supply power system controller, high voltage supply system controller, current surge circuit controller, impulse circuit controller, test converter valve water cooling controller and test equipment water cooling system controller. This system can control converter samples and auxiliary valves on set trigging timing, produce various operation tests need heat, voltage and current of the converter samples and carry through operation tests.

Abstract: This invention provides a high voltage thyristor valve multi-injection test method, it can meet one way valve and double valve operation test and over current test requirements. It has high equivalence and good flexibility. It includes FACTS double way thyristor valve and normal direct current thyristor valve operation tests and over current test. This method is novel, flexible, can carry out many different test and their mixture test and including the high voltage thyrsor valve different tests.

Abstract: This present invention provides a high power electronic device which is used for transforming the alternating current into the direct current, or transforming the direct current into the alternating current: a thyristor valve module, there are two same thyristor valve segments in the whole thyristor valve module; each segment includes saturated reactor, thyristor valve unit, direct current equalizing resistor unit, acquiring energy unit, damped resistor unit, damped capacitor unit, gate series unit and water cooling system. This device series connects the thyristor valves to meet different transmission powers and different voltage ranks. This device is the key element of the high voltage direct current transmission. It can be used for different voltage ranks AD transmission system and can also be used for different voltage ranks DC system, including the ultra-high voltage 800 kV and above system.

Abstract: The present invention relates to a self-cooled thyistor device for ultra-high voltage fault current limiter. a self-cooled thyristor valve, it adopts horizontal structure consisted by frames, frames is divided into upper and below two spaces by crossbeams, the bottom of frames is supported by insulators. There is a cross plate between two vertical said frames, the cross plate mounts resistors connect with a high potential plate and capacitor through two wires. There is a thyistor string in said frame upper space, which is constituted of thyistors and cooler series. The thyistor string is compressed tightly by press-fit mechanism, thyistor string crosses current transformers. There are high potential plates on both sides of the thyistor, the number of the potential plates is equal to that of thyistor. One side of the high potential plates links frames, said current transformers connects with high potential plates.