270 results about "Primary energy" patented technology

A device, method, and non-transitory computer readable medium for controlling a power distribution system includes an islanded microgrid and a control system. The islanded microgrid includes battery energy storage systems (BESSs) that operate as a primary energy source, and a decentralized consensus-based virtual synchronous generator (VSG). The control system simultaneously, emulates inertial response of a synchronous generator by the virtual synchronous generator during grid disruptions to regulate and stabilizes frequency of the islanded microgrid, and maintain consensus among the plurality of battery energy storage systems (BESSs).

The invention provides an AC / DC converter for realizing bidirectional current flow based on primary energy conversion, and relates to the technical field of converters. The AC / DC converter is used for realizing a single-phase rectification function or an inversion function; when a single-phase rectification function is realized, a first end and a second end of the AC-DC converter are respectively connected with two ends of an AC power supply, and a third end and a fourth end of the AC-DC converter are respectively connected with two ends of a load. When the inversion function is realized, the third end and the fourth end of the AC-DC converter are respectively connected with the two ends of the DC power supply; in the off-grid mode, the first end and the second end of the AC-DC converter are connected with the two ends of the load respectively. In the grid-connected mode, the first end and the second end of the AC-DC converter are connected with the two ends of the power grid respectively. According to the invention, a forward rectification function and a reverse-phase inversion function can be realized by adopting primary energy conversion, fewer devices are used, fewer sampling circuits are used, the equipment cost is lower, and the size is smaller.

The present invention provides a method for hydrogen-based reduction roasting pretreatment of chromite pellets, belonging to the field of metallurgical technology. The method comprises the following steps: mixing chromite powder, a binder and water to form pellets, obtaining green chromite pellets; mixing H2 and CO to obtain a reducing gas; and carrying out reduction roasting on the green chromite pellets in the reducing gas. The reduction roasting of the present invention is carried out in an H2-CO atmosphere, completely without involving the use of primary energy solid carbon, and enables the chromite pellets to obtain sufficient strength and metal pre-reduction degree before entering the ore thermal furnace, which can greatly reduce the comprehensive energy consumption and emissions in the production of ferrochrome alloy.

The invention discloses a PEMFC (proton exchange membrane fuel cell)-ORC (organic Rankine cycle)-TEG (thermoelectric generator) coupling-based waste heat utilization system and a coupling method. A PEMFC module, an ORC module and a TEG module are coupled; the system comprises a fuel cell, a TEG assembly, a condenser, a delivery pump, a pressure pump, a cooling water storage tank, an evaporator, an expansion machine, a filter, a humidifier, an ejector, a compressor and an electromagnetic valve. Heat carried by cooling water in the PEMFC cooling system is used as a main energy source for waste heat recovery. As the heat taken away by the cooling water is far greater than the directly discharged waste heat, the cooling water has higher enthalpy value and excellent heat recovery potential. By constructing a reasonable heat recovery path and a heat exchange network, the waste heat gradient utilization efficiency can be remarkably improved, and the higher primary energy utilization rate is achieved. And efficient recovery and gradient utilization of the waste heat of the PEMFC are realized.

The refrigeration house condenser waste heat recovery energy-saving system comprises a refrigeration module, the refrigeration module is connected with a first heat energy recovery module, and the first heat energy recovery module is connected with a user side; the refrigeration module comprises a compressor, a first condenser, a first expansion valve and a first evaporator, the compressor is communicated with the first condenser, the first condenser is communicated with the first expansion valve, the first expansion valve is communicated with the first evaporator, and the first evaporator is communicated with the compressor; the first heat energy recovery module comprises a first water pump and a first adjusting valve connected with the first water pump in parallel, and the first adjusting valve and the first water pump are connected with a water supply source and communicate with the first condenser. The first condenser is connected with a second regulating valve, the second regulating valve is respectively communicated with one end port of a third regulating valve and one end port of a fourth regulating valve, the third regulating valve is communicated with the first condenser, and the fourth regulating valve is connected with a user side. The system improves the utilization rate of primary energy in the operation process of the refrigeration house.

The invention discloses a compressed air centralized supply system based on double-layer LSTM and a control method thereof, and relates to the technical field of energy comprehensive utilization and industrial gas supply, the compressed air centralized supply system comprises a three-way valve, an air exhaust control valve, an air dryer, an air storage chamber, an air supply control valve and a pressure control valve; the method comprises the following steps: collecting related data in an operation process of a gas turbine generator set, and preprocessing the data; constructing a prediction model by adopting a double-layer LSTM algorithm to predict the gas consumption demand and the power grid load, and dynamically adjusting the gas suction rate, the pressure and the gas storage strategy; and by learning and updating the prediction model, performing safety control by adopting redundancy design and a fault detection isolation algorithm, and realizing control on the compressed air centralized supply system. The potential of the air compressor during variable working conditions of the gas turbine generator set is fully developed, compressed air storage and centralized supply are achieved, the air compressor does not need to be driven by electricity after power generation, the primary energy utilization rate is increased, and more environmental protection and energy saving are achieved.

The invention discloses a method for processing a steel roller with a polymer coating, which relates to the technical field of intelligent manufacturing and comprises the following steps of: sequentially loading a corresponding number of steel rollers to be processed into a die barrel on a base body, resetting and fixing an end cover on a base, rotating a top cylinder, and primarily finely adjusting and fixing the positions of the steel rollers to be processed; according to the invention, heat dissipated by the raw material slurry is taken as an original energy source, rapid cooling and shaping of the raw material slurry are promoted, static cooling is changed into dynamic cooling, the heat dissipation balance of the raw material slurry is improved, and the heat dissipation efficiency of the raw material slurry is improved. Static injection molding is changed into dynamic injection molding, the eccentricity rate after raw material forming is reduced, raw material slurry is more sufficiently and stably filled into a gap between a mold cylinder and a to-be-machined steel roller, the forming effect of a high-molecular coating is improved, and the adhesive force between the high-molecular coating and the to-be-machined steel roller is enhanced.

The invention relates to the technical field of photovoltaic energy storage adjustment, in particular to a photovoltaic energy storage adjustment method and system based on machine learning. Comprising the following steps: constructing a photovoltaic power prediction model based on historical monitoring data, and generating an expected power curve in a single adjustment period according to the photovoltaic power prediction model; setting a plurality of monitoring sub-cycles according to the expected power curve, and setting a primary energy storage strategy according to all the monitoring sub-cycles; a deviation evaluation value is generated according to the preset feedback time node, and whether a correction instruction is generated or not is judged according to the deviation evaluation value. A plurality of monitoring sub-cycles are set based on an expected power curve, a proper energy storage point is selected to perform charge and discharge control by analyzing a power fluctuation state in each monitoring sub-cycle, and early warning is performed on prediction deviation of a photovoltaic prediction model in time by analyzing actual photovoltaic power and environmental parameters. The overall loss of the energy storage system caused by photovoltaic power fluctuation is reduced, and the service life of the energy storage system is prolonged.

An inductive energy-storage forming line type nanosecond pulse generator having an output pulse regulation and control capability, the generator comprising a pulse forming main switch Mmain, a primary energy storage capacitor C, a transmission line Zstorage, a regulation and control switch Mcut, a modulation resistor Rcon, a load Rload and a voltage source Udc. The provided inductive energy-storage forming line type nanosecond pulse generator having an output pulse regulation and control capability regulates and controls, by means of two switches, an electromagnetic wave transmission process in a transmission line during pulse forming while having a high-gain nanosecond square-wave pulse output capability, thus realizing the output impedance matching modulation of a pulse source and having good practical value in biomedical applications.

The invention relates to a central heating system (1) with at least one primary heat source (2) that can be operated with the aid of fuels, with at least one electrically operated heat pump (3), with at least one water-to-air heat exchanger (4) and with at least one domestic hot water storage tank (5) for intermediate storage of domestic hot water (11), wherein a heat exchanger inlet line (L) WT, zu ) of the piping system (7) is fluidically connected on the one hand to the primary heat source (2) and on the other hand to the water-air heat exchanger (4), wherein a heat pump drain line (L WP, ab ) of the piping system (7) is fluidically connected on the one hand to the heat pump (3) and on the other hand to the primary heat source (2), and a method for operating and / or controlling and / or regulating such a central heating system (1). In particular, the demand for fuel for the primary energy source (2) is minimized over the year by installing a - first - 3 / 2-way valve (21.1) in the heat exchanger inlet line (L WT, zu ) is arranged, wherein a - first - 3-way connector (26.1) is located in the heat pump drain line (L WP, ab ) is arranged so that a branch flow circuit (K) is formed by means of a branch of the 3 / 2-way valve (21.1) and a branch of the 3-way connector (26.1). AB ) of the piping system (7) is formed, wherein the heat transfer fluid (6) is circulated through the branch circuit (K) by means of at least one pump (8, 9, 9b) AB ) is eligible for funding and with the help of the branch circuit (K AB ) flowing heat transfer fluids (6) the domestic hot water (11) can be heated.

The utility model discloses a two-stage energy storage jumping robot. The two-stage energy storage jumping robot comprises a rack and a plurality of jumping legs arranged on the rack, each bouncing leg comprises a thigh rod, a shank rod, a first-stage energy storage structure, a second-stage energy storage structure and a bouncing driving mechanism; one end of the thigh rod is hinged to the rack, and the other end is hinged to the shank rod; the primary energy storage structure acts between the thigh rod and the rack; the secondary energy storage structure acts between the thigh rod and the shank rod; the bounce driving mechanism is used for driving deformation to store elastic potential energy; the first-stage energy storage structure and the second-stage energy storage structure are used for correspondingly enabling the thigh rod and the shank rod to swing when elastic potential energy of the first-stage energy storage structure and the second-stage energy storage structure is released, so that the robot jumps upwards, and due to the fact that the second-stage spring is used for storing energy, high jumping height and distance can be provided for the robot.

The invention discloses a biomass gas heat pump system and a control method thereof. According to the method, a generator set part and a heat pump unit part are included; the electricity output end of the generator set part is connected with the electricity input end of the heat pump set part; the generator set part comprises a generator set, a radiator, a stop valve, a cylinder sleeve water heat exchanger and a flue gas waste heat recoverer; the heat pump unit part comprises a compressor, an oil separator, a four-way valve, a condenser, an electronic expansion valve, an evaporator and a gas-liquid separator; the system has two operation modes, namely refrigeration operation and heating operation, and can recover engine flue gas waste heat and cylinder sleeve water waste heat during heating, so that the heating capacity is large, and the heating energy efficiency is high. During refrigeration, flue gas waste heat and cylinder sleeve water waste heat need to be discharged into air, and only the heat pump unit supplies cold. According to the system, biomass gas serves as driving energy to drive the generator to operate, energy distribution of the generator set and the heat pump is adjusted in good time by reasonably utilizing engine cylinder sleeve water waste heat and smoke waste heat, and the primary energy utilization rate of the whole machine is increased.

An on-board electrical system (11), a means of transport (10), a control unit (EMS), and a voltage conversion arrangement between a primary side (1) and a secondary side (2) of an on-board electrical system (11) of a means of transport (10) are proposed. The arrangement comprises a DC / DC converter (3) for converting a primary-side DC voltage into a secondary-side DC voltage and vice versa, a primary-side voltage sensor (31) for measuring the primary-side DC voltage, a secondary-side voltage sensor (32) for measuring the secondary-side DC voltage, a data storage device (33), and an evaluation unit (34). The evaluation unit (34) is configured to initiate an operation for converting primary-side energy into secondary-side energy, depending on the data.provided that the secondary-side voltage (U2) is below a first predefined threshold (U2min) and / or the primary-side voltage (U1) is above a second predefined threshold (U1max), and depending on the data, to initiate an operation to convert secondary-side energy into primary-side energy, provided that the secondary-side voltage (U2) is above a third predefined threshold (U2max) and / or the primary-side voltage (U1) is below a fourth predefined threshold (U1min).

A radiation device comprises at least a vacuum chamber (1), an electromagnetic accelerator (8) for generating a primary energy beam of ions inside the vacuum chamber (1), and a layer of material (S) carried by a support (4) rotating in the vacuum chamber (1) to generate a flow of particles when a series of nuclear fusion reactions are triggered on the material (S) thanks to the energy of said beam, and wherein the support (4) is hollow and sealed defining a rotating three-dimensional surface that surrounds a containment volume for a cooling liquid in heat exchange with the layer of material (S), such rotating three-dimensional surface defining a heat exchange surface wetted by the liquid, and wherein a level of the free surface of the liquid on the heat exchange surface moves upwards in use due to the action of the centrifugal acceleration generated by the rotation of the support (4).

The invention relates to a system comprising a construction machine, which includes a first control unit, a DC circuit, and at least one electrical load that can be supplied with energy via the DC circuit, and a power supply module comprising a primary energy source for generating electrical energy and a second control unit by means of which the primary energy source can be controlled and / or regulated. According to the invention, the construction machine comprises a first communication interface connected to the first control unit and a first power supply interface connected to the DC circuit. Furthermore, the power supply module comprises a second communication interface connected to the second control unit and a second power supply interface connected to the primary energy source.The interfaces are each connectable and designed such that the first and second controllers, when connected, communicate with each other to control and / or regulate the energy supply to the electrical consumer via the primary energy source. The invention further relates to an energy supply module and a construction machine for such a system.

A continuously adjustable variable damping wave energy device comprises a main floating body used for converting wave energy into kinetic energy between a floater and the main floating body to complete primary energy conversion; the damping plate is located below the water surface to provide damping force, it is guaranteed that the main floating body is kept in a static state under the action of waves, and the floater moves vertically along the buoy under the action of the waves. The conversion assembly is used for converting thin or wave energy into available electric energy and storing the available electric energy; the vertical relative displacement of the floater and the buoy is converted into rotating motion through an inverse motion mode of the ball screw, and the gear box is driven to amplify the rotating speed to drive the generator to generate electricity. And the control assembly comprises a continuously adjustable damper and is used for adjusting the damping parameter of the device according to the wave environment so as to improve the energy capture efficiency of the device, meanwhile, the damping parameter is increased to the maximum value in the severe marine environment so as to lock the floater and the buoy, and the survivability and safety of the device are improved.

The invention is a fusion reactor and can solve energy problems. The reactor could be particularly important for the automotive industry because it can be used as a primary energy source. It enables the advancement of electromobility and could be installed in any vehicle. The reactor consists of a fusion chamber containing two fluid accelerators designed to send a fusion-capable, incompressible liquid in the form of very small microdroplets, generated in pairs, to a collision point. The microdroplets are then forced into collision at speeds of approximately 50–200 km / s. Due to the very high speed of the microdroplets, partial nuclear fusion occurs at the collision point, releasing energy that accelerates the components of the microdroplet in all directions and also impacts the following microdroplets, leading to additional nuclear fusion reactions there.The molecules / atoms of the liquid are additionally optimally aligned by electric fields for nuclear fusion of the deuterium atoms, directly at the collision point.

The invention discloses a coupling co-processing device for flood discharge, energy dissipation and quick release of supersaturated gas, and belongs to the technical field of water conservancy and hydropower engineering. The device comprises a concrete bottom plate, a second-stage energy dissipation pool is arranged on the concrete bottom plate, a first-stage energy dissipation pool is arranged on the concrete bottom plate and located on the inner side of the second-stage energy dissipation pool, and a plurality of water pressure and air pressure breaking assemblies and a plurality of energy dissipation assemblies D are arranged on the concrete bottom plate and located on the inner side of the first-stage energy dissipation pool; a plurality of energy dissipation assemblies C are arranged on the portion, between the second-stage energy dissipation pool and the first-stage energy dissipation pool, of the concrete bottom plate, an energy dissipation assembly A is arranged on the portion, on the outer side of the second-stage energy dissipation pool, of the concrete bottom plate, and an energy dissipation assembly B is arranged on the portion, on the downstream side of the energy dissipation assembly A, of the concrete bottom plate. After the dam discharged water flow is subjected to seven times of energy dissipation, the flow velocity of the water flow is obviously reduced, the energy dissipation effect is remarkable, and supersaturated gas in the dam discharged water flow is sufficiently separated out and released.

The invention relates to a quick design method for a floating body system of an oscillating water column type wave energy device, which comprises the following steps of: selecting a proper turbine system type according to wave characteristics of a target sea area, and determining the size, blade shape and rotating speed of the turbine system; performance parameters of the turbine system are obtained through numerical simulation and experimental testing, and the performance parameters of the turbine system are simplified; according to the performance parameters of the simplified turbine system, a correlation model of the turbine system and a floating body system is established, and wave boundary conditions are set; carrying out grid division on a flow field around the floating body system, selecting a proper turbulence model and a solver, and carrying out steady-state or transient-state simulation; and calculating the primary energy conversion efficiency of the floating body system and optimizing the floating body system. According to the method, the design period and the repeated modification frequency are reduced, parameter matching between the turbine system and the floating body system is more reasonable through the whole design method, the energy conversion efficiency of the whole device is improved, and the performance of the whole system is optimized.

The invention provides equipment and a method for preparing a fuel and desulfurizer composite material from sludge and biomass. The equipment comprises a sludge storage, transportation and charging unit, a biomass treatment and charging unit, a limestone treatment and charging unit, a stirrer, a dehydration device, a granulator and a product bin. According to the invention, sludge, biomass and limestone are used as raw materials, and according to the characteristics of the raw materials, through a certain ratio and a preparation process, the dual functions of sludge and biomass co-processing as a fuel and a desulfurizer are realized. The prepared composite material is high in calorific value, heat self-sustaining of boiler combustion can be achieved, and a large amount of primary energy is saved; meanwhile, in the combustion process, the composite material can form huge pores, a higher specific surface area is provided for desulfurization reaction, and compared with traditional limestone in-furnace desulfurization, the desulfurization efficiency can be integrally improved, and the effective utilization value of solid waste resources is maximized.

An electrical energy storage system has a plurality of primary energy storage units. Each primary energy storage unit has an inherent internal resistance. The system further includes one or more additional energy storage units. At least one additional energy storage unit further has a pseudo resistance. One or more controllers control the charging and discharging of each of the primary and additional energy storage units. Control of the charging and discharging of the, or each, additional energy storage units with the pseudo resistance is distinguished from the charging and discharging of each primary energy storage unit, and is distinguished from the charging and discharging of any additional energy storage unit that lacks a pseudo resistance.

A device, method, and non-transitory computer readable medium for controlling a power distribution system includes an islanded microgrid and a control system. The islanded microgrid includes battery energy storage systems (BESSs) that operate as a primary energy source, and a decentralized consensus-based virtual synchronous generator (VSG). The control system simultaneously, emulates inertial response of a synchronous generator by the virtual synchronous generator during grid disruptions to regulate and stabilizes frequency of the islanded microgrid, and maintain consensus among the plurality of battery energy storage systems (BESSs).

The utility model provides a micro electric energy collection circuit. The rectification unit is responsible for converting the alternating current output of the piezoelectric collector into a pulsating direct current signal; the synchronous charge extraction unit comprises a self-powered peak detection circuit and a synchronous switch controller and is responsible for efficiently transferring charges from a piezoelectric element to an electric quantity extraction inductor; the secondary electric energy storage unit comprises a primary electric energy storage device, a detection switch, a charging circuit, a secondary electric energy storage device and a voltage stabilization output circuit, input and output of each functional module are sequentially connected in series, and electric energy flows in a one-way mode; the absorption circuit is responsible for absorbing the electric energy in the inductor extracted by the circuit and effectively storing and stably outputting the electric energy; all the functional units are sequentially connected in series, and electric energy flows from the rectifying unit to the voltage stabilizing output circuit of the secondary storage unit in a one-way mode. The input end of the rectification unit is connected with the output end of the micro-electric energy collector, and the output end of the secondary storage unit is connected with the low-power-consumption internet-of-things sensor load. According to the utility model, intermittent weak AC electric signal energy from piezoelectric elements can be efficiently captured, and the intermittent weak AC electric signal energy can be adjusted to a stable output voltage of the Internet of Things sensor through secondary storage.

The invention provides a high-temperature steam system and method based on waste heat recovery and vinasse recycling, belongs to the technical field of steam systems, and can solve the problems that when an existing steam system is applied to the brewing industry, a large amount of primary energy needs to be consumed, and brewing by-products are not sufficiently utilized. According to the technical scheme, the waste heat recovery assembly comprises a heat exchanger, a high-temperature heat pump unit, a heat storage tank, a high-temperature steam heat pump unit and a condensate water tank; the vinasse recycling assembly comprises a biogas steam boiler, a double-membrane gas holder and an anaerobic bioreactor. According to the system, industrial by-products of a brewing factory can be comprehensively recycled, high-temperature steam required by a boiling process of the brewing factory is provided while secondary steam generated by a boiling pot, low-grade waste heat of the factory and brewing waste are recycled, and the energy utilization efficiency of the system is improved; a novel high-efficiency, low-carbon and energy-saving high-temperature steam system is provided for a brewing factory.

The invention discloses a heat pump system and a waste heat recovery method, and belongs to the technical field of heat pump waste heat recovery, the heat pump system is used for recovering waste heat of a waste heat source, the waste heat source comprises a water outlet pipe and a water inlet pipe, and the heat pump system comprises a first-stage heat exchange unit, a second-stage heat exchange unit and a cold using end assembly; the first-stage heat exchange unit comprises a first condensation assembly and a first evaporation assembly, and a heating side channel of the first condensation assembly is connected with the water outlet pipe and used for receiving waste heat and heating water into high-temperature water. A cooling side channel of the first evaporation assembly is used for introducing normal-temperature water and outputting low-temperature water after the normal-temperature water is cooled; the second-stage heat exchange unit comprises a second condensation assembly and a second evaporation assembly. The two ends of a heating side channel of the second condensation assembly communicate with a cooling side channel of the first evaporation assembly and the water inlet pipe correspondingly. And the cold end assembly is in heat exchange connection with the second evaporation assembly. Waste heat can be converted into high-grade heat energy and cold energy at the same time, consumption of primary energy is reduced, and the energy utilization efficiency is improved.

The invention discloses a multi-stage self-destruction physical destruction device and method for an unmanned vehicle control chip, the device comprises a moving sliding block, a bottom plate and a second-stage energetic material, and the moving sliding block comprises a sliding block and a first-stage electromagnetic coil; the tail end of the slider is provided with a lead. The bottom plate comprises a base plate and a secondary electromagnetic coil; a lead is laid on the substrate; the wire is connected in series with a third-stage transduction element; a third-stage energetic material is arranged on the third-stage transduction element; the third-stage energetic material is connected with a power line; a first-level energetic material is arranged at the bottom of the safety pin groove, a first-level energy conversion element is arranged below the first-level energetic material, and a second-level energy conversion element is arranged at the bottom of the sliding block. The method comprises the steps that the first-stage energy conversion element excites the first-stage energetic material to damage the safety pin, the second-stage electromagnetic coil and the first-stage electromagnetic coil drive sliding block to move so that the second-stage energetic material and the second-stage energy conversion element can be aligned, and the copper wire and the wire are short-circuited; the secondary energy conversion element excites the secondary energetic material to damage the chip; the wire and the copper wire are connected in series with the third-stage energy conversion element, the third-stage energy conversion element excites the third-stage energetic material after being electrified, the power line is damaged, and the unmanned vehicle is powered off. According to the invention, vehicle operation termination and data irreversible destruction in an out-of-control scene are ensured.

The invention provides a three-phase primary energy conversion AC / AC converter and a control method thereof, and relates to the technical field of converters. According to the three-phase one-stage energy conversion AC / AC converter and the control method thereof, one-stage energy conversion is adopted by the converter to achieve AC / AC conversion, a mainstream AC / DC + DC / AC two-stage framework is replaced, fewer devices are used, and high efficiency and low cost are achieved. Meanwhile, the converter can be operated in a boost mode and can also be operated in a buck mode. And the converter is not provided with a bus capacitor, so that the problem of short service life of the bus capacitor is solved.

The utility model provides a kind of dehumidification dry steam unit, including primary energy conversion component, waste heat condenser and secondary energy conversion component, waste heat condenser has primary refrigerant inlet, primary refrigerant outlet, secondary refrigerant inlet and secondary refrigerant outlet;The primary energy conversion component includes: primary compressor, for refrigerant reaches predetermined temperature and pressure, with refrigerant inlet and refrigerant outlet, its refrigerant outlet is connected with the primary refrigerant inlet of waste heat condenser by pipeline;First internal pipeline and second internal pipeline, the gas needing drying is sequentially passed through first internal pipeline, second internal pipeline, and first internal pipeline and second internal pipeline are communicated head to tail along the direction of gas flow;Finned condenser, located in second internal pipeline, with refrigerant inlet and refrigerant outlet, its refrigerant inlet is communicated with the primary refrigerant outlet of waste heat condenser by pipeline;Finned evaporator;Primary gas-liquid separator.

The invention provides a single-phase inverter based on primary energy conversion and a modulation strategy thereof, and relates to the technical field of inverters. The single-phase inverter reuses the inductor and the filter capacitor in the Buck mode and the Boost mode, so that the proposed circuit topology only needs a single inductor and a single filter capacitor element, and compared with a traditional circuit with a two-stage structure, the number of the inductors and the number of the filter capacitors are reduced, and the power density is improved. Meanwhile, based on first-stage energy conversion, only a first-stage switching tube works at high frequency to perform energy conversion, and the efficiency is improved. The invention provides a dual-carrier modulation strategy with different amplitudes for the proposed primary energy conversion single-phase inverter topology. And smooth switching of the converter between the Buck mode and the Boost mode can be realized. And the frequencies of the two carriers can be adjusted, so that the Buck mode and the Boost mode of the converter have the same or different switching frequencies.

The invention relates to a road construction machine (1) comprising: a chassis (12, 112) for moving the road construction machine (1); a main drive device (3, 103) for driving the chassis (12, 112); a main energy storage unit (17, 117) for supplying the main drive (3, 103) with electrical energy or an energy medium; a material hopper (7, 107); and a material hopper insert (14, 114, 14a) for receiving the paving material (PM). The material hopper insert (14, 114, 14a) is removably mounted on the material hopper (7, 107). The material hopper insert (14, 114, 14a) has at least one secondary energy storage unit (15, 115, 15a) for driving the chassis (12, 112) and / or for supplying the primary drive (3, 103) with electrical energy or an energy medium.