239 results about "Effective power" patented technology

The invention provides a solar cell and a photovoltaic module, and belongs to the technical field of solar cells. The solar cell comprises a silicon substrate comprising a first surface and a second surface which are opposite to each other; the first surface of the silicon substrate comprises a plurality of conductive regions which are arranged at intervals, the doped conductive layers are arranged on the conductive regions respectively, and a groove which is concave towards the interior of the silicon substrate is formed between every two adjacent conductive regions; wherein the groove comprises two opposite side faces and a bottom face located between the two side faces, and at least part of the side faces are provided with a plurality of sheet-shaped structures. The light absorption capability of the solar cell and the photoelectric conversion efficiency of the solar cell are effectively improved, and the effective generating capacity of the solar cell in the life cycle can be improved.

The invention relates to the technical field of motors, and provides an efficient cooling high-speed permanent magnet synchronous motor which comprises a motor shell, an air inlet hole is formed in the outer surface of the motor shell, a supporting ring is detachably connected to the interior of the motor shell, a stator winding is fixedly connected to the inner side of the supporting ring, and a rotor is rotatably connected to the inner side of the stator winding. A rotating shaft is fixedly connected to the middle of the rotor, blades are fixedly connected to the outer surface of the rotating shaft, a cavity formed by the stator winding, the rotor, the motor shell and the end cover is an air passing channel, an air outlet pipe is fixedly connected to the outer surface of the motor shell, and an air outlet opening is formed in the surface of the stator winding. A cavity formed by the inner side position, corresponding to the supporting ring, of the stator winding, the supporting ring and the motor shell is an air outlet cavity. According to the technical scheme, the problems that an existing high-speed permanent magnet synchronous motor winding is high in accumulated heat, the effective power capacity of the motor is reduced, the manufacturing cost of a motor with the same power level is high, and manufacturing materials are wasted to a certain extent are solved.

The invention discloses an active-disturbance-rejection control method and system for a four-port magnetic network electric energy router, and belongs to the technical field of isolated power electronic converters. The method is based on a proportional-integral control method of a decoupling matrix, and is combined with an adaptive disturbance suppression state observer to be used in the magnetic network electric energy router, so that the active disturbance rejection of the system is improved, and particularly, the common problem of parameter mismatching in a traditional decoupling control method is solved. The method comprises the following steps: step 1, establishing a simple and effective power decoupling matrix, thereby realizing efficient power decoupling among a plurality of ports, effectively reducing mutual interference among the ports, and ensuring that control of each port can be independent and stable; and 2, introducing an adaptive disturbance suppression state observer into a feedback system, so that the system can estimate and compensate errors caused by parameter uncertainty or noise interference in real time, and the active disturbance rejection of the system under dynamic and complex working conditions is greatly improved.

The utility model provides an intelligent scheduling command platform with integrated scheduling, and effectively solves the problem that the scheduling work is influenced because an interphone and a camera in the prior art are lack of effective means of effective electric quantity. The dispatching command platform comprises an electric quantity monitoring module, the electric quantity monitoring module comprises a primary diagnosis circuit and a secondary diagnosis circuit, the primary diagnosis circuit detects a current signal of a battery in dispatching equipment during use by using a current sensor, obtains a reminding signal and an early warning signal based on the current signal, and sends the reminding signal and the early warning signal to the secondary diagnosis circuit; the reminding signal and the early warning signal are output to a command center; the primary diagnosis circuit is connected with one end of the secondary diagnosis circuit, and the other end of the secondary diagnosis circuit is connected with the command center.

The invention discloses a composite insulation monitoring equipment cooperative work control system and method suitable for a complex ship power supply network. An acquisition module in the system acquires a state signal of the complex ship power supply network through a digital quantity input signal cable; the control unit is in communication connection with the acquisition module and is used for receiving the state signal and executing cooperative control logic; the output module is in communication connection with the control unit and is connected with an expansion relay through a digital quantity output signal cable, and the expansion relay is used for controlling input or quit of the insulation meter. The on-off state of each circuit breaker and the operation state of each insulation monitor are collected, the input and the output of each insulation monitoring meter are controlled according to a manually set requirement principle, and the condition that one insulation meter continuously works is avoided by setting a certain cycle time and changing the priority among the insulation monitoring meters. According to the control method, various insulation monitoring devices on a certain type of ship can be matched for use, and a continuous and effective power grid insulation state monitoring function is realized.

Provided is a substrate processing apparatus comprising: a substrate support on which a substrate is mounted; a first radio frequency power supply that outputs first radio frequency power with a first frequency to the substrate support; a second radio frequency power supply that outputs second radio frequency power with a second frequency lower than the first frequency to the substrate support; a sensor that detects reflected waves received from the substrate support and a processor that controls the first radio frequency power supply so that an effective power, which is equal to a difference between the power of the reflected waves detected by the sensor and the output power of the first radio frequency power supply, reaches a set value.

The invention discloses a stirring head power consumption detection method, a server, a storage medium and a program product, and relates to the field of welding. According to the method, the server collects the sound field vibration signals in the welding process through the sound field sensor and conducts wavelet transformation, main frequency band energy and phase information are obtained, then the sound field distortion factor and the sound field rotation angular speed are calculated, and the sound field distortion factor and the sound field rotation angular speed are input into the power consumption calculation model to obtain effective power consumption of the stirring head. Compared with traditional power consumption monitoring which only depends on current, voltage and other electrical parameters, the method can accurately reflect the complex dynamic state of mechanical contact, and the working state of the stirring head is monitored in a multi-dimensional mode. The uniformity of sound field energy distribution is quantified (abnormal contact of the stirring head is found in time, workpiece damage or excessive loss of the stirring head caused by energy concentration is avoided, and the welding quality stability is improved), the sound field energy transmission efficiency is tracked, and the accuracy and real-time performance of power consumption calculation are improved.

The invention discloses a main and standby power supply switching circuit, an ECU power supply system and a vehicle, and relates to the field of main and standby power supply switching, and the main and standby power supply switching circuit comprises a main power supply and a standby power supply; the output end of the main power supply is connected with the input end of the DCDC module, the output end of the DCDC module is connected with the anode of the first diode, the output end of the standby power supply is connected with the anode of the second diode, and the cathodes of the first diode and the second diode are both connected with the input end of the power supply module; the first diode and the second diode have the same specification; when the main power supply is in a normal working state, the initial output voltage of the DCDC module is greater than the effective power supply voltage of the standby power supply; and when the main power supply is in a fault state, the actual output voltage of the DCDC module is reduced to zero from the initial output voltage. According to the invention, automatic switching from the main power supply to the standby power supply can be realized without an additional control switch.

The utility model discloses a wafer surface degumming device which comprises an installation box and a driving motor arranged at the lower end of the installation box, the output end of the driving motor is connected with a transmission shaft, a centrifugal tray used for fixing and heating a wafer is movably arranged on the transmission shaft, a connecting assembly is arranged between the transmission shaft and the centrifugal tray, and the centrifugal tray is connected with the transmission shaft. A vibration mechanism for improving the centrifugal efficiency is arranged in the mounting box; the wafer centrifugal degumming device is simple in structure and reasonable in design, achieves the effect of synchronous high-frequency vibration of a wafer in the centrifugal degumming process, reduces the bonding force between molten glue points and the surface of the wafer under the action of vibration, is easier to throw out under the same centrifugal force, remarkably improves the efficiency and the degumming effect of the wafer centrifugal degumming, and reduces the production cost of the wafer centrifugal degumming device. Meanwhile, effective power output of the centrifugal tray in vibration is achieved through the transmission shaft, the transmission effect can still be guaranteed under the condition that the centrifugal tray inclines, and the wafer degumming efficiency is further improved.

The invention relates to a back contact battery, a preparation method thereof and a photovoltaic module. In the preparation process of the back contact battery, the laser slicing process is completed in any step before the texturing and passivating processes, so that the cut surface damage generated in the cutting process can be repaired in the subsequent texturing and passivating processes; meanwhile, the layout of the metal grid lines in the cutting area is optimized, the distance D1 between the cutting line in the laser slicing and the edge metal grid line closest to the cutting line is smaller than or equal to 0.3 mm, the distance between the edge metal grid line closest to the cutting line and the cutting line is shortened, the effective power generation area of the middle half-cut area is increased, and then the conversion efficiency of the cell is improved.

The settlement device includes: a measurement value acquisition unit, which acquires the measurement value of the effective power exchanged at a connection point with an adjustment force providing unit that can provide adjustment force to the transmission and distribution network and the measurement value of the frequency at the connection point; an adjustment power metering unit, which measures the adjustment power at the connection point based on the acquired measurement value of the effective power and the measurement value of the frequency; an adjustment power amount calculation unit, which accumulates the adjustment power with respect to time to calculate the adjustment power amount for a given period at the connection point; an electric power acquisition unit, which acquires the electric power exchanged at the connection point during the given period; and a settlement unit, which settles the consideration for the adjustment power provided by the adjustment force providing unit and the electric power exchanged by the adjustment force providing unit based on the sum of the adjustment power amount and the electric power amount.

The invention discloses an edge-cleaning microstructure of a perovskite component and a preparation method thereof, the edge-cleaning microstructure comprises a plurality of micro grooves formed in an edge-cleaning area of the perovskite component, and the surface length of the edge-cleaning microstructure is not less than the creepage spacing of the perovskite component. By introducing a micro-groove structure, the actual creepage distance K is prolonged under the limited edge cleaning width L, the physical edge cleaning width is reduced on the premise of meeting the safety standard, and the reduction of the edge cleaning width is beneficial to improving the effective power generation area of the perovskite assembly and improving the output power of a single-chip assembly; the method is formed through a laser process, is high in process compatibility, and is suitable for mass production packaging of large-area and high-efficiency perovskite components.

The invention discloses an SSD low-power-consumption control method and device and a medium, and relates to the technical field of SSDs, and the method comprises the steps that a system-on-chip receives an effective power-off notification signal from a host through a preset universal input and output pin; in response to the effective power-off notification signal, the system-on-chip writes the data in the cache into a nonvolatile storage medium of the solid state disk; then, the system-on-chip sends a control instruction to the power management chip through the communication bus, and a power-off control register of the power management chip is configured to be in an enabled state; the power management chip responds to the power-off control register to be in the enabled state, all power output except the power input by the power management chip in the solid state disk is cut off, and the solid state disk enters a low-power-consumption state. The problem that the power consumption of a traditional partial power-off scheme is not reduced thoroughly is solved, meanwhile, the hardware cost and complexity caused by a scheme depending on a standby power capacitor are avoided, and extreme low-power-consumption control on the premise that data safety is guaranteed is achieved.

The present invention provides a solar cell module capable of increasing an effective power generation area while suppressing an increase in resistance, and a vehicle having the solar cell module mounted thereon. A solar cell module (1) is a perovskite-type solar cell in which a light-receiving section (1A) and a light-shielding section (1B) each have a substrate (11), a first electrode layer (12), a functional layer (13), and a second electrode layer (14) in this order. The first electrode layer (12) and the second electrode layer (14) are electrically connected. When viewed from the light incidence direction, the connection width (w1) between the first electrode layer (12) and the second electrode layer (14) in the light receiving section (1A) is smaller than the connection width (w2) between the first electrode layer (12) and the second electrode layer (14) in the light blocking section (1B).

This invention discloses a method and system for real-time prediction of laser strike effects for rapid deployment. The system includes: defining standard reference environmental parameters, calibrating standard attenuation coefficients and standard power-to-target (PTO) values; constructing a benchmark database; collecting target environmental parameters and calculating the power attenuation ratio between the target environmental parameters and the standard reference environmental parameters; calculating the PTO power under the target environmental parameters based on the power attenuation ratio, and calculating the PTO power density based on the PTO power; finding the benchmark minimum effective power density of the target target material based on the benchmark database; and, if the PTO power is greater than or equal to the benchmark minimum effective power density, estimating the estimated penetration time of the target target material based on the PTO power, the power density at which the target material penetrates the target material under the standard reference environmental parameters, and the penetration time. This invention features extremely low computational complexity, fast response speed, and guarantees laser strike effects superior to empirical estimates.

The invention provides a tripping outlet power supply circuit and electronic equipment. The tripping outlet power supply circuit comprises a first driving module, a second driving module, a logic module, an outlet power supply generation module and an outlet module, the logic module is electrically connected with the first driving module, the second driving module and the outlet power supply generation module, and the outlet power supply generation module is electrically connected with the outlet module. The first driving module is used for being electrically connected with a first CPU, the second driving module is used for being electrically connected with a second CPU, and the outlet power supply generation module and the outlet module are both used for being electrically connected with the logic control module. According to the tripping outlet power supply circuit provided by the embodiment of the invention, accurate management and control of the tripping outlet can be realized, that is, effective power supply signals can be output only when the first CPU and the second CPU are normal, so that the outlet module is triggered to act, stable outlet is realized, the stability and the safety of a tripping outlet link are remarkably improved, and the service life of the tripping outlet is prolonged. And reliable operation of a power system is ensured.

The invention belongs to the technical field of electricity-to-water metering and intelligent analysis of a water pumping system. The invention provides a water taking metering power consumption correction method based on a multi-dimensional operation signal and deep learning, aiming at solving the problem of water volume false report caused by increase of actual water demand and increase of power consumption due to efficiency degradation / fault of a water pump, which cannot be distinguished by converting electricity into water in the prior art. The invention provides the water taking metering power consumption correction method based on the multi-dimensional operation signal and deep learning. According to the method, vibration, sound, voltage / current waveform and other signals are collected, an electrical-mechanical-hydraulic three-layer initial atlas is constructed, a cross-layer hypergraph is generated, hyperedge and pump curve prior constraints are indicated through load consistency and loss, a load or loss event is judged on the hypergraph, and an event gating signal is output; further aggregating energy semantics on the edge-level energy diagram along a physical consistent path of electricity, machine and water, decomposing the total power consumption into effective and invalid power consumption, marking the source of the invalid power consumption, and mapping the water quantity by the effective power consumption; according to the method, fault energy consumption can be avoided, water consumption is counted, and meanwhile, supervision and operation and maintenance bases are provided.

The invention provides a method for measuring and calculating the unit yield power consumption of electrochemical synthesis ammonia, the method is used for measuring and calculating the unit yield power consumption of an electrochemical synthesis ammonia device, and the electrochemical synthesis ammonia device at least comprises a plasma generator, a circulating electrolyte pump, an air pump and an electro-catalysis power supply; the method comprises the following steps: S100, obtaining effective power consumption of the electrochemical ammonia synthesis device within operation time tr; s200, the mass of ammonia generated by the electrochemical ammonia synthesis device within the operation time tr is obtained; s300, based on the effective power consumption and the mass of ammonia, the electrochemical synthesis ammonia unit yield power consumption is calculated, and the effective power consumption of the electrochemical synthesis ammonia device comprises the power consumption of a plasma generator, the power consumption of a circulating electrolyte pump, the power consumption of an air pump and the power consumption of an electro-catalysis power source.

The invention discloses a broadband Schottky frequency tripling circuit structure and related components, and relates to the field of signal processing. Two groups of Schottky diode strings which are reversely connected in parallel are integrated on a single radio frequency circuit substrate, and an input split-phase structure and a synthesis output structure are matched, so that independent frequency doubling and power synthesis of two paths of differential signals in a single-chip circuit are realized, the effective power capacity is improved to twice that of a traditional single-channel structure, and the output power is improved. According to the structure, while the power is improved, a complex waveguide network and a plurality of independent radio frequency circuit substrates required by a traditional multi-channel power synthesis technology are avoided, the problems of transmission loss, volume expansion and channel consistency caused by the complex waveguide network and the plurality of independent radio frequency circuit substrates are eliminated, and the unification of high power, broadband, miniaturization and high integration level is really realized.

This disclosure provides a method, system, and epitaxial wafer for improving particulate contamination of silicon wafers during epitaxy. The method includes: selecting at least one test silicon wafer from a batch of silicon wafers to be processed, and determining a target power range to be applied to the epitaxial furnace based on the test results of the test silicon wafer; adjusting the effective power applied to the epitaxial furnace to the target power range before the silicon wafer to be processed is fed into the epitaxial chamber of the epitaxial furnace, so that the temperature inside the epitaxial chamber is within a target temperature range; maintaining the effective power of the epitaxial furnace within the target power range until the silicon wafer to be processed enters the epitaxial chamber, thereby using the target temperature range to suppress thermal deformation of the silicon wafer to be processed; and growing an epitaxial layer on the surface of the silicon wafer to be processed after it enters the epitaxial chamber. This disclosure can effectively reduce particulate contamination of the silicon wafer to be processed during epitaxy.

The application discloses a zero-current photovoltaic string branch automatic alarm method and system, the method comprises the following steps: collecting the direct-current data of each photovoltaic string branch under each busbar box, and synchronously collecting the corresponding inverter output power data, busbar identification data, branch number data and branch maintenance state data; uploading the collected data to the power monitoring background and establishing a string branch real-time monitoring database; determining the effective power generation working condition based on the comparison result of the inverter output power and the preset power generation power threshold; performing zero-current screening on the branch in the effective power generation working condition, and performing carding shielding determination in combination with the branch maintenance state; performing fault positioning on the zero-current fault candidate branch; triggering alarm output according to the positioning result, and generating zero-current alarm information of the corresponding branch. The application can realize automatic identification, accurate positioning and hierarchical alarm of the zero-current fault branch, and is suitable for large photovoltaic power station operation monitoring scenes.

This invention provides a grid-connected control method and system for a distributed photovoltaic (PV) power station. It includes: acquiring the electricity consumption of an electrical device; acquiring the effective power of the PV power station; when the effective power is greater than the electricity consumption, using the PV power station to supply power to the electrical device; and when the effective power is less than the electricity consumption, connecting the PV power station to the grid and using mains power to supply power to the electrical device. Because the effective power of the PV power station can be acquired, and power is supplied to the electrical device only when the effective power exceeds the electricity consumption, and otherwise using mains power, the power supply equipment for the electrical device is a single device, preventing the simultaneous use of two power supply devices, reducing the complexity of power supply control, improving power supply stability, and reducing power supply costs.

The invention provides a back contact photovoltaic cell electrode structure, a photovoltaic cell interconnection method and a cell assembly, the back contact photovoltaic cell electrode structure comprises a first polarity Pad point array, a second polarity Pad point array, a first surface insulation Pad point and a second surface insulation Pad point, the first polarity Pad point array and the second polarity Pad point array are respectively provided with corresponding welding strips along the Pad point extension direction, the welding strip is electrically connected with the Pad point; the first surface insulation Pad point is a surface insulation Pad point at a preset position along the Pad point extension direction of the first polarity Pad point array; and the second surface insulation Pad point is a surface insulation Pad point at a preset position along the Pad point extension direction of the second polarity Pad point array. By arranging the surface insulation Pad points and the welding strips, the invalid occupied space is reduced, the proportion of the effective power generation area in the back contact photovoltaic cell assembly is increased, and then the power generation efficiency is improved.

The present invention discloses an audio power adjustment method, device, and system based on Power over Ethernet. The method adjusts the input current and output power of a step-down circuit with synchronous rectification by obtaining the type parameters of a self-powered device, collects the peak power required by the power supply switch circuit, and compares it with the effective power supply power of the power supply device. When it is determined that the required power is greater than the power supply power, the supercapacitor is adjusted to a power supply state so that it and the step-down circuit with synchronous rectification can simultaneously power the power supply circuit. The power amplifier voltage gain of the output audio power amplifier is adjusted according to the second output voltage of the power supply switch circuit, and the corresponding audio power signal is output through the adjusted audio power amplifier. The input current and output power of the step-down circuit with synchronous rectification are adjusted according to the type parameters of the power supply device, thereby improving the adaptability and compatibility of the system with different types of power supply devices. The power supply switch circuit is supplied with high power by the supercapacitor, realizing power amplification through POE standard technology.

The present invention provides a method, system, and related apparatus for evaluating the energy efficiency of photovoltaic modules in mountainous areas based on spatiotemporal heterogeneous conditions, comprising the following steps: Step 1, calculating the module power generation efficiency coefficient and the string power generation corresponding to a single inverter due to the consistency factor of photovoltaic string module installation; Step 2, obtaining the maximum effective power generation per unit installed capacity and the second-level active power of the string corresponding to the maximum power generation; Step 3, obtaining the actual power generation of the string corresponding to a single inverter for energy efficiency evaluation; Step 4, calculating the theoretical power generation of the string for energy efficiency evaluation; Step 5, calculating the ratio between the actual power generation of the string for energy efficiency evaluation and the theoretical power generation of the string for energy efficiency evaluation, and using it as the module energy efficiency evaluation index; The present invention effectively solves the problems of inconsistent module installation and uneven spatial distribution of irradiance caused by mountainous terrain, and significantly improves the accuracy and reliability of module energy efficiency evaluation.

The utility model discloses a tricycle motor cover, and relates to the technical field of motor covers. An outer plate is arranged at the top end of the cover body, a plurality of reinforcing blocks are evenly and fixedly connected to the outer plate and the cover body along the circumferential side face, a shaft passing hole is formed in the middle of the cover body and penetrates through the cover body and the outer plate, at least four locking holes are evenly formed in the cover body along the circumferential side face, and a shaft fixing barrel is fixedly connected to the middle of the inner side of the cover body. A plurality of reinforcing strips are arranged between the fixed shaft barrel and the cover body, a positioning ring is arranged on one side of the cover body, and two constant pressure strip openings are formed in the positioning ring. According to the utility model, the strength structure, the connection tightness and the connection stability of the motor cover are improved, and the connection tightness of the motor cover and the shell is effectively improved, so that the end cover is prevented from vibrating at different frequencies relative to the shell when the motor vibrates; the functions of improving the structural stability of the motor shell and assisting in improving the effective operation power of the motor are achieved.

The utility model discloses a laser film carving machine for a special-shaped optical kinetic energy battery piece, which belongs to the technical field of laser film carving automation equipment and is characterized by comprising a laser device, a visual positioning device, a motion platform mechanism and a clamping positioning mechanism, the laser device and the visual positioning device are located above the clamping and positioning mechanism, after the optical kinetic energy battery piece is placed on the clamping and positioning mechanism, the visual positioning device accurately grabs and positions the optical kinetic energy battery piece, the motion platform mechanism is accurately positioned through computer logic operation, and a motion pattern path is guided in; the motion platform mechanism drives the optical kinetic energy battery piece to move in an XY plane according to a scribing path, the laser device achieves continuous and stable laser scribing on the optical kinetic energy battery piece, and serial-parallel microcircuit patterns in the special-shaped optical kinetic energy battery piece with the needed electrical performance are obtained. The technical processing of three film scribing procedures can be realized by one machine, and the effective power generation area of the photo-kinetic energy battery is increased by 2.44%.

The utility model relates to the technical field of AGVs (Automatic Guided Vehicle), in particular to an AGV for forking a support shaped like a Chinese character'tian ', a lifting module adopts the design of a driving shear fork unit and a driven shear fork unit, so that the lifting of a single fork arm assembly can provide effective power only by a single driving source, the structure is simplified, the support of the fork arm assembly is more stable, and the lifting efficiency is improved. The shear forks in the lifting modules are shorter and can stretch out and draw back from gaps between cross beams at the bottoms of the matts, and the effect of forking the matts is achieved; in the forking process, a shear fork of the lifting module is supported by the ground, supporting is more stable through the structure, additional balance weights do not need to be added to an AGV body, and the size and the weight are smaller; through the design of the portal assembly, the telescopic movement of the multiple fork arm top plate modules connected with the portal assembly is synchronous, the telescopic movement of the multiple fork arm assemblies can be achieved only through one power source, and the cost is reduced.

This invention relates to the field of photovoltaic data prediction technology, specifically disclosing an integrated platform and data processing method for photovoltaic power plant energy management and power prediction. By acquiring the discrete-time series of photovoltaic power output from the platform and the platform's low-frequency sampling period, while simultaneously extracting the high-frequency disturbance period from the inverter control logic, the theoretical aliasing center frequency is calculated. The system can accurately determine the anchoring point of aliasing artifacts in the spectrum. Subsequently, by constructing a variational mode decomposition model, the power sequence is decomposed into multi-mode functions. Based on the center frequency matching, candidate aliasing artifact data with the smallest difference is extracted, and their permutation entropy is calculated. By subtracting these artifact data and analyzing the Pearson correlation of the remaining signal, the model dynamically adjusts to find the true signal, ensuring that only effective power change data is extracted, and ultimately outputting high-precision photovoltaic power prediction, improving the safety and economy of grid dispatch.

A processing section of an instruction generating device provided separately from a general inverter performs the following processing. A rotation calculating section calculates a value related to rotation of a rotor of a virtual generator when the virtual generator is driven in accordance with a rotor model that calculates a value related to rotation of the rotor of the virtual generator based on simulation of driving the virtual generator and an effective power command. A target determining section determines a target value of a voltage frequency and a target value of an effective power based on the calculated value related to rotation. An instruction generating section generates a control command for the inverter based on the determined target value of the voltage frequency and the target value of the effective power. A time constant related to a synchronous force of the rotor model and a time constant related to a synchronous force of the alternator are identical.