30results about How to "Avoid load loss" patented technology

The invention relates to a method for operating an internal combustion engine (1) with two-stage turbocharging by a low-pressure exhaust gas turbine (6) and a high-pressure exhaust gas turbine (7), the low-pressure exhaust gas turbine (6) being positioned downstream of the high-pressure exhaust gas turbine (7) in the exhaust system (3) of the internal combustion engine (1), and the high-pressure exhaust gas turbine (7) being provided with a bypass line (11) with a control valve (12). In order to achieve quick response of the internal combustion engine (1) in transient operation, it is provided that continuously or periodically at certain intervals preferably an electronic control unit will check whether a steady-state or a transient operating state of the internal combustion engine (1) is prevailing, and that the control valve (12) is controlled in accordance with at least one steady-state characteristic map (32, 33) in the steady-state case and in accordance with at least one transient characteristic map (31) or a transient function in the transient case.

The invention discloses a steel structure. The steel structure is characterized by comprising stand columns and beams; the stand columns comprise supporting columns and bracket structures; the supporting columns comprise supporting column pipe cavities; the bracket structures comprise sleeves which are provided with sleeve walls; the sleeve walls define sleeve cavities; first through holes penetrating through the sleeve walls are formed in the sleeve walls; the first through holes communicate with the sleeve cavities, and the sleeve walls are connected with the supporting columns; the beams comprise outer sleeves which are provided with outer sleeve walls; the outer sleeve walls define outer sleeve cavities; the outer sleeve walls are inserted into the supporting column pipe cavities from the first through holes; and the ends of the outer sleeve pipe walls are located in the supporting column pipe cavities or penetrate through the sleeves and protrude out of the sleeve walls. The structure principle of the steel structure is applied to a steel structure so as to solve the problems of beam continuity, structure fixing and node strength. The condition of beam top concrete pouring grooves is ingeniously used for welding, and the problem of steel structures is completely solved.

The invention discloses a voltage source regulating device with multiple redundant configurations, which includes an energy storage unit, a power conversion unit, a filter isolation unit, a solid-state switch unit and a circuit breaker, wherein the power conversion unit consists of four groups of power converters with anti-parallel diodes Composition of semiconductor devices, the sources of the first and third power semiconductor devices are connected to the positive pole of the energy storage unit, the drains of the second and fourth power semiconductor devices are connected to the negative pole of the energy storage unit, and the first and second AC output terminals are isolated from the filter The primary side of the unit is connected; the secondary side of the filter isolation unit is connected to the solid-state switch unit, and the circuit breaker is connected in parallel to the solid-state switch unit; one end of the circuit breaker is connected to the power supply side, and the other end is connected to the load side; the solid-state switch unit includes power semiconductor devices. This kind of device can not only realize fast compensation, but also have high reliability. The invention also discloses a control method of a voltage source type regulating device with multiple redundant configurations.

The DC power downshift method and system based on the accurate perception of the power loss of the new energy station of the present invention include the fault monitoring substation sending power grid fault information to the coordination control main station and the new energy control substation; the new energy control substation; After receiving the grid fault information, the station sends it to the centralized management and control system of the new energy station; after the centralized management and control system of the new energy station receives the grid fault information, it calculates the total amount of off-grid active power of the new energy through the information fed back from the new energy collection terminal; The energy station centralized management and control system sends the new energy off-grid active power of this station to the new energy control sub-station; after the coordinated control master station calculates the total amount of new energy off-grid active power in the whole network, the power grid execution station receives all the off-grid active power. After the speed-down DC power control command is given, implement the speed-down DC power control. The invention is beneficial to the frequency stability and emergency control after the large-scale off-grid of the new energy unit, and is beneficial to ensure the safe and stable operation of the power grid with a high proportion of new energy.

The invention provides a foundation pit supporting frame, and relates to the technical field of buildings. The foundation pit supporting frame comprises a foundation pit bottom plate, supporting members, a purlin beam and a drainage member; the foundation pit bottom plate is arranged at the bottom of a foundation pit; the supporting members are arranged in the foundation pit and used for supporting a rock-soil layer, the supporting members are located in the circumferential direction of the foundation pit bottom plate, the supporting members are in a cuboid shape and are provided with cavities, and the bottom ends of the supporting members are lower than the foundation pit bottom plate; the purlin beam is used for supporting the two opposite supporting members, and the purlin beam is arranged on the upper portions of the supporting members and connected to the two opposite supporting members correspondingly; and the drainage member is arranged in the rock-soil layer, at least part of the drainage member extends into the cavity, and the drainage member is used for draining water in the rock-soil layer into the cavity. The foundation pit supporting frame is reasonable in structure, good in drainage effect and capable of effectively preventing the foundation pit retaining wall from collapsing.

The invention discloses a steel support structure. The steel support structure is characterized in that the steel support structure comprises a column and a bracket structure; the column has a column cavity; the bracket structure comprises a casing pipe; the casing pipe has a casing pipe wall which is enclosed to form a casing pipe cavity; the casing pipe wall is provided with a first through hole penetrating the casing pipe wall; and the first through hole is communicated with the casing pipe cavity, and the casing pipe wall is connected with the column. The steel support structure can overcome problems in continuation of beams, fixation of structures and strength of nodes of steel structures and ingeniously carrying out welding in virtue of concrete pouring grooves on beam tops; so problems in construction of steel structures are thoroughly overcomes.

The invention discloses a transmission network dynamic reconfiguration method based on a 3 / 2 wiring mode. The transmission network dynamic reconfiguration method comprises the steps of: constructing atopological structure and parameter model of a power grid real-time mode or a mode to be studied, and evaluating capability and risks of independent district-wide operation of district power grids ofinterest; evaluating benefits and potential risks of electromagnetic looped network operation formed by the district power grids, and analyzing a cost of solving the electromagnetic looped network risks; analyzing a 3 / 2 wiring string configuration method in a transformer substation, and providing a dynamic reconstruction scheme for solving the electromagnetic looped network risk problem; and considering power supply reliability of a normal mode and potential risks of an accident mode, and deciding a district power grid operation mode optimal arrangement scheme and a power grid dynamic reconfiguration suggestion comprehensively. The transmission network dynamic reconfiguration method based on the 3 / 2 wiring mode avoids the load flow from shifting within the electromagnetic looped network in the accident mode, does not cause overload of low-voltage level equipment or damage to the system stability, and improves the operation safety of the system.

The invention discloses a chain link type automatic synchronous tensioning system and method for prestressed wire ropes. The chain link type automatic synchronous tensioning system comprises an anchor plate, wherein the anchor plate is fixed on a structure to be reinforced through planted bars; a plurality of main threaded rods are arranged in the anchor plate in a parallel and penetrating manner; one end of each of the main threaded rods is connected with a corresponding screw sleeve, and the other end of each of the screw sleeves is connected with a corresponding steel wire rope; after the other end of each of the main threaded rods penetrates through a corresponding opening of the anchor plate, the other end of each of the main threaded rods is fixed by a corresponding anchoring toothed nut; a tensioning bracket is arranged on one side of the anchor plate; after the main threaded rods penetrate in the tensioning bracket, each of the main threaded rods is connected with a corresponding secondary threaded rod through a corresponding connecting sleeve; after the other ends of the secondary threaded rods penetrate out of the tensioning bracket, the other ends of the secondary threaded rods are separately fixed on the tensioning bracket by corresponding tensioning toothed nuts; and the anchoring toothed nuts and the tensioning toothed nuts are separately connected with a driving mechanism. According to the chain link type automatic synchronous tensioning system disclosed by the invention, anchoring a plurality of steel wire ropes can be realized through one anchor plate, so that the reinforcing efficiency and the reinforcing effect of a conventional structure are improved; and synchronous tensioning and synchronous locking are performed on all the steel wire ropes on the anchor plate, so that the situation that the bearing capacity is reduced due to uneven distribution of the prestressing force of the steel wire ropes is avoided, and the automatic synchronous tensioning system is convenient to use, and simple and high-efficiency to mount.

The invention discloses a photovoltaic off-grid inverter control method, and relates to the technical field of a photovoltaic off-grid inverter. The method is realized in such a way that by establishing a functional module architecture, a computer system is controlled by computer program instructions, and the computer program instructions are stored in a computer readable storage medium. A photovoltaic off-grid inverter comprises a mains supply rectifier module, a photovoltaic output control module, a battery and a busbar. An input end of the mains supply rectifier module is connected with a mains supply, and an output end is connected with the busbar. An input end of the photovoltaic output control module is connected with a solar panel, and an output end is connected with the busbar. The battery is charged from the busbar or discharged to the busbar. The control method is that if the solar energy is sufficient, the conduction angle of a switching element of a rectifier of the mains supply rectifier module is limited so as to be not less than a preset conduction angle limit value <theta>min. Thus, the case in which the rectifier is turned off due to that the conduction angle of the switching element is too small can be prevented, so that the mains supply rectifier module is ensured not to be turned off when the solar energy is sufficient.

The invention discloses an adjustable piezoelectric ceramic oil seal edge liquid hydrostatic bearing. The adjustable piezoelectric ceramic oil seal edge liquid hydrostatic bearing comprises a shaft, astator, a first outer check ring, a second outer check ring, a first framework seal ring, a second framework seal ring, a first inner check ring, a second inner check ring, a first piezoelectric ceramic twin lamella and a second piezoelectric ceramic twin lamella. The rotor is a rotary body. Five coaxial rotary body cavities are formed in the rotary body. Four hydrostatic support cavities are evenly distributed in the inner circumference of a third cavity circumferentially. A radial oil inlet is formed in the center of each hydrostatic support cavity. A first piezoelectric ceramic groove anda second piezoelectric ceramic groove are machined in the inner circumference of the second cavity and the inner circumference of the fourth cavity correspondingly. Oil outlets are radially formed inthe top of the inner circumference of the first cavity and the top of the inner circumference of the fifth cavity correspondingly. The first piezoelectric ceramic twin lamella and the second piezoelectric ceramic twin lamella are embedded in the first piezoelectric ceramic groove and the second piezoelectric ceramic groove correspondingly. The piezoelectric ceramic twin lamellas are adopted for adjusting the thickness of a liquid film, the problem that the bearing force of the liquid hydrostatic bearing is lowered due to heating during operation is avoided, and the system stability is maintained.