摘要:
A photovoltaic plant comprises one or more strings (2, 2', 2",...) of photovoltaic modules (3, 3', 3",...) connected in series, at least one inverter (5, 5', 5") electrically connected to each string (2, 2', 2",...) for injecting the electrical energy produced by the same into the net (R), a central control unit (7) for controlling and varying the energy produced by each single string (2, 2', 2",...), one or more electronic connection units (6, 6', 6",...) interposed between the strings (2, 2', 2",...) and the central control unit (7) for transmitting control signals of each single string (2, 2', 2",...), a local control unit (8, 8', 8",...) associated with each single string (2, 2', 2",...) and connected to a the inverter (5, 5', 5") to control the electric parameters of the energy injected into the net (R) and connected with one of electronic connection unit (6, 6', 6",...) for drawing the maximum instantaneous electric power (MPPT) from each single string (2, 2', 2",...) and for transmitting and/or receiving control data of each single string (2, 2', 2",...) from the central control unit (7). Each of said control local unit (8, 8', 8",...) associated to each single string (2, 2', 2",...) is adapted to process electric signals with minimum and maximum values different from those generated by the other strings in such a manner to increase the flexibility of the plant.
摘要:
A motorized head for multiple-head machines for twisting threads or for similar processes includes: a supporting pivot (2) for a thread spindle or reel (3); a rotor (5) that is coaxial to the pivot for unwinding and twisting the thread; a motor connected to the rotor to make it rotate at a controlled speed. The motor consists, for each head, of a single electric motor (8) of the high-efficiency brushless type with cylindrical permanent magnets, directly coupled to the rotor (5). An electronic circuit (11) for speed and power supply control, independent of the circuit of other heads, is associated with the motor. The motor speed and power supply control circuit (11) is a miniaturized frequency converter that is integrated in the motor shell.
摘要:
A unit for controlling the synchronization of a complex machine during power failures or losses, wherein the machine comprises a plurality of motorized devices (A1, A2, A3) for the movement and control of the various components, and wherein each device is connected to the power supply bus by virtue of a speed converter (C1, C2, C3), each device having a known flywheel mass (m1, m2, m3) and having, in the steady state, a speed that is synchronized with that of the other devices. The unit includes: a system (2) for recognizing an actual grid power failure; systems for measuring the speed and the current of the various devices; a computing device (3) for calculating the moments of inertia of the most significant flywheel masses, of their respective speeds and absorbed currents; a circuit (5) for comparing the voltage of the supply bus with the last value of the voltage detected before the grid power failure, suitable to generate a first error signal; a closed-loop regulator circuit (7) for processing the first error signal so as to generate a second signal in output. The second signal can be sent to a multiplier operator (X1, X2, X3) that is associated with each converter to control the gradual and synchronous deceleration of all the devices, converting part of the kinetic energy of the most significant flywheel masses into electric power to supply the system.
摘要:
A method of synchronizing a synchronous reluctance electric machine wherein the machine has no speed and/or residual magnetization voltage sensor and includes power terminals and rotating masses whose mechanical rotation frequency is subjected to speed transients caused by power cut-off conditions. The method includes at least one step of applying a control voltage with predetermined amplitude and duration to the terminals after the transients, and one step of detecting the electric current induced by the control voltage, the current induced by the voltage having a harmonic spectrum variable according to the frequency differential between the frequency of the control voltage and the mechanical rotation frequency of the rotating masses, to restore power and synchronous rotation control of the machine.
摘要:
A movement control system for a drilling plant (T) comprises at least a first hydraulic circuit (2) for actuating the actuating means (A) with an inlet duct (3) and an outlet duct (4) for a working fluid, at least one pumping device (5) of reversible type adapted to promote the circulation of the fluid from the inlet duct (3) to the outlet duct (4), at least one first electric machine (6) mechanically coupled to the pumping device (5) to promote the circulation of the fluid in the first hydraulic circuit (2), wherein the first electric machine (6) is connected to an electric circuit (7) connectable to the net(N) or to an electric accumulator. The first electric machine (6) is adapted to selectively operate as electric motor to promote the circulation of the fluid in a first sense and to drive the actuating means (A) during the rise of the drilling head (H), and as electric generator upon fluid flow in a second sense opposite the first promoted by the actuating means (A) during the lowering of the drilling head (H) to inject in the net (N) or in the accumulator the electric power generated by the first machine (6).
摘要:
A synchronous reluctance motor comprises a stator (2) having at least one pair of poles and a plurality (ns) of grooves (3) for each pair of poles, a transverse-laminated rotor (5) with a plurality of disk-line sheet metal members (7, 7', 7",...) of predetermined outside diameter (D), each having a plurality of adjacent slots (8, 8',...; 9, 9',...; 10, 10',...; 11, 11 ',...) and a central through hole (12) of predetermined inside diameter (d), each slot (8, 8',...; 9, 9',...; 10, 10',...; 11, 11 ',...) having a substantially curved elongate shape, symmetrical with respect to a radius, with end portions closed at the edge (13) of a corresponding sheet element (7, 7', 7",...) to define corresponding ribs (14, 14', 14"), which are adapted to be magnetically saturated to be equivalent to rotor slots. At least one first portion of the sheet elements (7, 7', 7",...) has a ratio of the inside diameter (d) to the outside diameter (D) equal to or greater than 0.45 and a number (nr) of equivalent rotor slots (14, 14', 14") equal to the number (ns) of stator grooves (3) per pole pair, decreased or increased by four units.
摘要:
An electric generator (1) for the conversion of energy from a renewable energy source, such as wind energy, into electrical energy to be inserted into a local or remote network (R), which comprises a rotary electric machine (2) provided with means (3) for drawing energy from the renewable source and for converting into electrical energy, first control means (4) for regulating the functioning parameters of the machine (2), second control means (5) for regulating the parameters of the electrical energy generated by the machine (2), and connection means (6) for electrically connecting the second control means (5) to the network (R), wherein the machine (2) is positioned in a space (V) placed at a predetermined distance (h) with respect to a base (B) that is fixed or anchorable with respect to the ground (T). The first control means (4) are housed in a first case (7) placed inside the space (V), the second control means (5) are housed in a second case (8) that is different and spatially offset with respect of the first, and the second control means (5) are electrically connected to the first control means (4), to facilitate the mounting and the maintenance of the generator.
摘要:
A photovoltaic plant for comprises a plurality of strings (2, 2', 2",...) each having two or more photovoltaic panels (3, 3', 3",...) connected in series, at least one junction box (4, 4', 4",...) connected to one or more strings (2, 2', 2",...) and housing at least one current converter (5, 5', 5",...) to vary the power energy generated by each single string (2, 2', 2",...) and a peripheral control unit (6, 6', 6",...) for controlling the converter (5, 5', 5",...); at least one inverter (7, 7', 7",...) connected to each converter (5, 5', 5",...) for injecting into the net (R) the electrical energy produced by the strings (2, 2', 2",...), a central control unit (8) connected to the inverter (7, 7', 7",...) to control the energy generate by said plurality of strings (2, 2', 2",...) and to each periphery unit (6, 6', 6",...) to control the output electric power from each junction box (4, 4', 4",...). The central control unit (8) comprises sensor means (18) associated with the inverter (7, 7', 7",...) to detect the electric parameters associated with the energy injected into the net (R) and to control the converters (5, 5', 5",...), the central control unit (8) being housed into a casing (9) different and spatially spaced apart with respect to each junction box (4, 4', 4",...) and from the inverter (7, 7', 7",...) to allow separate and independent operation on each between the central control unit (8) and at least one inverter (7, 7', 7",...).
摘要:
A cooling device for electronic components includes a substantially prismatic body made of a thermally conductive material, which has a pair of substantially planar main outer surfaces and encloses therein at least one circuit for the flow of a cooling fluid. Both main outer surfaces are designed to allow removable attachment of an electronic component to be cooled. A control apparatus incorporating the device.