A power factor optimization method and device

Abstract

The embodiment of the application discloses a power factor optimization method and device, and is used for the technical field of power factor optimization. Wherein, an initial pulse wave output by a rectifier circuit is acquired; the initial pulse wave is subjected to phase shift processing, and the initial pulse wave after the phase shift processing is adjusted based on a peak value of a multi-phase alternating voltage to obtain a target pulse wave; the waveform inclination of the target pulse wave is greater than the waveform inclination of the initial pulse wave; and the boost circuit is fed forwardly compensated based on the target pulse wave. Through the processing of the initial pulse wave, the current waveform can be quickly output during commutation, the power factor of the boost circuit is improved, and thus the product efficiency is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the power factor optimization technical field, in particular to a power factor optimization method and device. BACKGROUND

[0002] The feedforward compensation of the existing boost circuit is to control the duty cycle of the switch tube in the boost circuit through the input voltage of the boost circuit and the output voltage of the boost circuit, so that the output voltage of the boost circuit is greater than the input voltage of the boost circuit.

[0003] And in the circuit structure of three-phase input + rectifier circuit + boost circuit, the voltage sampling point of the input voltage of the boost circuit is located between the rectifier circuit and the boost inductor of the boost circuit, and the input voltage of the boost circuit is the voltage rectified by the rectifier circuit. When the input of the rectifier circuit is three-phase input (that is, three-phase alternating voltage is input), the output voltage of the rectifier circuit after rectification is six-pulse, and the six-pulse is used as the input voltage of the boost circuit for feedforward compensation.

[0004] However, in the process of feedforward compensation by the six-pulse, because the waveform is relatively slow in the process of rising and falling, it is easy to cause the power factor of the boost circuit to be low. Therefore, a power factor optimization mode is urgently needed to improve the power factor in the boost circuit. SUMMARY

[0005] The embodiment of the present application provides a power factor optimization method and device, which can effectively improve the power factor in the boost circuit.

[0006] The embodiment of the present application provides a power factor optimization method, which comprises:

[0007] After the rectifier circuit inputs multi-phase alternating voltage, an initial pulse wave output by the rectifier circuit is acquired, and an output end of the rectifier circuit is connected to the boost circuit;

[0008] The initial pulse wave is subjected to phase shift processing, and the initial pulse wave after phase shift processing is adjusted based on the peak value of the multi-phase alternating voltage to obtain a target pulse wave; so that the waveform inclination of the target pulse wave is greater than the waveform inclination of the initial pulse wave;

[0009] The boost circuit is subjected to feedforward compensation based on the target pulse wave.

[0010] Further, the acquisition of the initial pulse wave output by the rectifier circuit comprises:

[0011] Based on the phase angle of a preset phase in the multi-phase alternating voltage input by the rectifier circuit, an initial analog pulse wave output by the rectifier circuit is obtained, and the initial analog pulse wave is taken as the initial pulse wave;

[0012] Or, sampling at the output end of the rectifier circuit to obtain the initial pulse.

[0013] Further, the phase-shifting processing of the initial pulse and the adjustment of the initial pulse after phase-shifting processing based on the peak value of the multi-phase alternating voltage to obtain the target pulse include:

[0014] The initial pulse is phase-shifted based on a preset offset angle, and the initial pulse after phase-shifting is front-end shaped to adjust the initial pulse after shaping based on the peak value of the multi-phase alternating voltage to obtain the target pulse.

[0015] Further, after the initial pulse is phase-shifted based on the preset offset angle, the method further includes:

[0016] Obtaining the pulse obtained after the initial pulse is phase-shifted;

[0017] Determining the waveform interval of a preset phase in the multi-phase alternating current;

[0018] Based on the waveform interval, the initial pulse after phase-shifting is obtained.

[0019] The adjustment of the initial pulse after phase-shifting processing based on the peak value of the multi-phase alternating voltage to obtain the target pulse includes:

[0020] The phase angle of the preset phase in the multi-phase alternating voltage is multiplied by a sine function, and then multiplied by the peak value of the multi-phase alternating voltage to obtain the target pulse.

[0021] Further, the front-end shaping of the initial pulse after phase-shifting includes:

[0022] The phase angle of the preset phase in the initial pulse after phase-shifting is superimposed with a preset offset angle, so that the initial pulse after phase-shifting is front-end shaped based on the preset offset angle.

[0023] Further, the phase-shifting processing of the initial pulse and the adjustment of the initial pulse after phase-shifting processing based on the peak value of the multi-phase alternating voltage to obtain the target pulse include:

[0024] The initial pulse is first phase-shifted, and the initial pulse after first phase-shifting is adjusted based on the peak value of the multi-phase alternating voltage to obtain a preset pulse;

[0025] The initial pulse is second phase-shifted, the initial pulse after second phase-shifting is frequency-doubled, and the initial pulse after frequency-doubling is adjusted based on a preset pulse peak value to obtain a multiple frequency pulse; wherein the preset pulse peak value is less than the peak value of the multi-phase alternating voltage;

[0026] Superimpose the multiple times pulse wave to the preset pulse wave to obtain a multi-wave pulse wave, and take the multi-wave pulse wave as the target pulse wave.

[0027] Further, after the first phase shift processing on the initial pulse wave, the method further comprises

[0028] obtaining a first pulse wave obtained after the first phase shift processing on the initial pulse wave;

[0029] determining a waveform interval of a preset phase in the multi-phase alternating voltage;

[0030] obtaining the initial pulse wave after the first phase shift processing based on the waveform interval;

[0031] After the second phase shift processing on the initial pulse wave, the method further comprises:

[0032] obtaining a second pulse wave obtained after the frequency multiplication processing on the initial pulse wave after the second phase shift processing;

[0033] determining a waveform interval of the multiple times pulse wave;

[0034] obtaining the initial pulse wave after the frequency multiplication based on the waveform interval.

[0035] Further, the adjusting the initial pulse wave after the first phase shift processing based on the peak value of the multi-phase alternating voltage to obtain a preset pulse wave comprises:

[0036] multiplying a phase angle of the preset phase in the initial pulse wave after the first phase shift processing by a sine function, and then multiplying the peak value of the multi-phase alternating voltage to obtain the preset pulse wave.

[0037] The adjusting the initial pulse wave after the frequency multiplication based on the peak value of the preset pulse wave to obtain a multiple times pulse wave comprises:

[0038] multiplying a phase angle of the preset phase in the initial pulse wave after the frequency multiplication by a sine function, and then multiplying the peak value of the preset pulse wave to obtain the multiple times pulse wave.

[0039] Embodiments of the present application also provide a power factor optimization device, comprising:

[0040] an obtaining unit configured to obtain an initial pulse wave output by a rectifier circuit after the rectifier circuit inputs a multi-phase alternating voltage, and the output end of the rectifier circuit is connected to the boost circuit;

[0041] an adjusting unit configured to perform phase shift processing on the initial pulse wave, and adjust the initial pulse wave after the phase shift processing based on the peak value of the multi-phase alternating voltage to obtain a target pulse wave; so that the waveform inclination of the target pulse wave is greater than the waveform inclination of the initial pulse wave.

[0042] a compensation unit configured to feed forward compensate the boost circuit based on the target pulse.

[0043] The power factor optimization device comprises a central processing unit, a memory, an input / output interface, a wired or wireless network interface, and a power supply.

[0044] The central processing unit is configured to communicate with the memory and execute instruction operations in the memory on a control plane function entity to perform the above method.

[0045] The memory is a transient storage memory or a persistent storage memory.

[0046] The central processing unit is configured to communicate with the memory and execute instruction operations in the memory on a control plane function entity to perform the above method.

[0047] From the above technical solutions, the embodiments of the present application have the following advantages:

[0048] In the embodiments of the present application, an initial pulse output by a rectifier circuit is obtained, and an output end of the rectifier circuit is connected to a boost circuit; the initial pulse is subjected to phase shift processing, and the initial pulse after phase shift processing is adjusted based on a peak value of a multi-phase alternating voltage to obtain a target pulse; the boost circuit is feed forward compensated based on the target pulse; the power factor of the boost circuit can be effectively improved. As can be seen, through processing of the initial pulse, the waveform inclination of the target pulse is greater than that of the initial pulse; the current waveform can be quickly output during commutation, the power factor of the boost circuit is improved, and thus the product efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0050] Figure 1 A power factor optimization flowchart disclosed in the embodiments of the present application;

[0051] Figure 2 Another power factor optimization flowchart disclosed in the embodiments of the present application;

[0052] Figure 3 A power factor optimization circuit diagram disclosed in the embodiments of the present application;

[0053] Figure 4 A schematic diagram of an initial simulation six-pulse wave disclosed in the embodiments of the present application;

[0054] Figure 5A schematic diagram of an initial analog six-pulse wave after phase shifting disclosed by an embodiment of the present application;

[0055] Figure 6 A schematic diagram of an initial analog six-pulse wave after forward tilting shaping disclosed by an embodiment of the present application;

[0056] Figure 7 A current waveform diagram of a target analog six-pulse wave disclosed by an embodiment of the present application;

[0057] Figure 8 Another power factor optimization flow chart disclosed by an embodiment of the present application;

[0058] Figure 9 Another power factor optimization circuit diagram disclosed by an embodiment of the present application;

[0059] Figure 10 A schematic diagram of a multi-wavehead six-pulse wave disclosed by an embodiment of the present application;

[0060] Figure 11 A current and voltage waveform diagram in a circuit disclosed by an embodiment of the present application;

[0061] Figure 12 A power factor optimization device diagram disclosed by an embodiment of the present application;

[0062] Figure 13 A power factor optimization device diagram disclosed by an embodiment of the present application. DETAILED DESCRIPTION

[0063] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative work fall within the scope of protection of the present application.

[0064] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0065] In the description of the embodiments of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0066] In the prior art, in the circuit structure of three-phase input + rectifier circuit + boost circuit, the voltage sampling point of the input voltage of the boost circuit is located between the rectifier circuit and the boost inductor of the boost circuit, and the input voltage of the boost circuit is the voltage after the rectification of the rectifier circuit. The voltage sampling point has a ripple of the switching stage, which is easy to cause interference in the input voltage of the boost circuit, and affect the feedforward compensation of the boost circuit. Moreover, the waveform of the input voltage of the boost circuit is relatively slow in the rising and falling process, which is easy to cause low power factor of the boost circuit.

[0067] Therefore, the embodiments of the present application provide a power factor optimization method, which can effectively reduce the interference of feedforward compensation and improve the power factor in the boost circuit, so as to ensure the normal operation of the boost circuit and improve the efficiency of the product. Figure 1 As shown in the figure, the specific steps are as follows:

[0068] 201, obtaining an initial pulse wave output by a rectifier circuit.

[0069] In the embodiments of the present application, the power factor optimization device can obtain an initial pulse wave output by a rectifier circuit after inputting a multi-phase alternating voltage into the rectifier circuit; wherein the rectifier circuit is an uncontrolled rectifier bridge, i.e. a rectifier bridge composed of multiple diodes; the multi-phase alternating voltage can be an alternating voltage input by a power supply or an alternating voltage input by a generator, and the specific embodiments are not limited herein. The multi-phase alternating voltage can be two-phase or three-phase alternating voltage, and the specific embodiments are not limited herein.

[0070] The output end of the rectifier circuit is connected to a boost circuit, i.e. the voltage after the rectification of the rectifier circuit is the input voltage of the boost circuit. It can be understood that the voltage after the rectification has one positive half wave and one negative half wave in each phase in a cycle; the negative half wave is turned up by rectification, and becomes two positive half waves. For example, when the multi-phase alternating voltage is three-phase alternating voltage, 3 phases have 6 positive half waves superimposed, forming six pulse waves; and when the multi-phase alternating voltage is two-phase alternating voltage, 2 phases have 4 positive half waves superimposed, forming four pulse waves. The input voltage of the boost circuit is the pulse wave output after the rectification of the rectifier circuit.

[0071] The initial pulse can be an initial analog pulse output by the rectifier circuit, or the initial pulse can be obtained by sampling at the output end of the rectifier circuit, which is not limited herein. It can be understood that the voltage sampling point has ripple at the switching stage, which is easy to cause interference in the input voltage of the boost circuit. Preferably, the initial analog pulse output by the rectifier circuit can be obtained based on the phase angle of a preset phase in the multiphase alternating voltage input to the rectifier circuit, and the initial analog pulse can be taken as the initial pulse to avoid the switching stage interference in the sampling process. The preset phase can be the A phase, the B phase or the C phase in the multiphase alternating voltage, which is not limited herein. Specifically, the analog pulse (two pulses) of the preset phase can be obtained through the phase angle of the preset phase, and the analog pulse of the other phase can be obtained by phase shifting the analog pulse of the preset phase based on the phase relationship between the preset phase and the other phase, so as to obtain the initial pulse output by the rectifier circuit.

[0072] It can be understood that the number of pulses of the initial pulse corresponds to the number of phases of the multiphase alternating voltage input to the rectifier circuit. For example, when the input is a two-phase alternating voltage, the obtained initial pulse is an initial four-pulse; when the input is a three-phase alternating voltage, the obtained initial pulse is an initial six-pulse.

[0073] 202. The initial pulse is phase-shifted, and the initial pulse after phase shifting is adjusted based on the peak value of the multiphase alternating voltage to obtain a target pulse.

[0074] In an embodiment, after obtaining the initial pulse, the initial pulse can be phase-shifted, wherein the initial pulse can be shifted to the left or to the right, which is not limited herein. Then, the initial pulse after phase shifting is forwardly shaped. Specifically, the waveform corresponding to the initial pulse after phase shifting can be cut at a corresponding forward angle, and the waveforms at the starting time and the commutation time are replaced by the cut surface. The waveform of each pulse after cutting is lowered from the highest point of the initial pulse, and the corresponding waveform on the cut surface rises rapidly, that is, the voltage rises rapidly at each commutation time.

[0075] When the initial pulse is the initial analog pulse output by the rectifier circuit based on the phase angle of a preset phase in the multiphase alternating voltage input to the rectifier circuit, the initial analog pulse after phase shifting is forwardly shaped, and the shaped initial analog pulse is adjusted based on the peak value of the multiphase alternating voltage to obtain a target analog pulse. It can be understood that the peak value of the actual pulse (i.e. the voltage after rectification) obtained after the multiphase alternating voltage is rectified by the rectifier circuit is consistent with the size of the peak value of the multiphase alternating voltage. The peak value of the shaped initial analog pulse can be adjusted based on the peak value of the multiphase alternating voltage, so that the peak value of the target analog pulse is the same as the peak value of the actual pulse after rectification. This can make the target analog pulse more consistent with the pulse after actual rectification by the rectifier circuit, and improve the accuracy of the target analog pulse.

[0076] In another embodiment, after obtaining the initial pulse, the initial pulse can be subjected to a first phase shift processing, wherein the initial pulse can be shifted leftward or rightward, which is not limited here. Then, the initial pulse after the first phase shift processing can be adjusted based on the peak value of the multi-phase alternating voltage to obtain a preset pulse, which has the same number of pulses as the initial pulse.

[0077] It can be understood that the peak value of the actual pulse obtained after the multi-phase alternating voltage is rectified by the rectifier circuit (i.e., the rectified voltage) is consistent with the peak value of the multi-phase alternating voltage; when the initial pulse is an initial analog pulse, the peak value of the initial pulse can not be consistent with the peak value of the multi-phase alternating voltage; or when the initial pulse is obtained by sampling, sampling interference in the sampling process can also cause the peak value of the initial pulse to be inconsistent with the peak value of the multi-phase alternating voltage. At this time, the peak value of the initial pulse after the first phase shift processing can be adjusted based on the peak value of the multi-phase alternating voltage to obtain a preset pulse, which has the same peak value as the multi-phase alternating voltage, so that the preset pulse is more consistent with the actual pulse after the rectifier circuit is rectified, and the accuracy of the preset pulse is improved.

[0078] After the initial pulse is subjected to the first phase shift processing, it can also be subjected to a second phase shift processing at the same time, which is not limited here. The initial pulse after the second phase shift processing can be subjected to frequency multiplication processing, and the initial pulse after the frequency multiplication can be adjusted based on the preset pulse peak value to obtain a multiple-time pulse.

[0079] Specifically, after obtaining the initial pulse, the initial pulse can be subjected to a second phase shift processing, wherein the initial pulse can be shifted leftward or rightward, which is not limited here. The second phase shift processing can be the same as the first phase shift processing (i.e., the same shift direction and shift angle), or different from the first phase shift processing (i.e., different shift direction or shift angle), which is not limited here. The initial pulse after the second phase shift processing can be subjected to frequency multiplication processing, wherein the initial pulse after the phase shift can be multiplied by a preset multiple to realize frequency multiplication of the pulse; the preset multiple can be any integer from 1 to 6, which is not limited here.

[0080] Then, the initial pulse after the frequency multiplication can be adjusted based on the preset pulse peak value to obtain a multiple-time pulse, wherein the preset pulse peak value is less than the peak value of the multi-phase alternating voltage. By adjusting the peak value of the initial pulse after the frequency multiplication based on the preset pulse peak value, the peak value of the multiple-time pulse can be less than the peak value of the preset pulse. It can be understood that the number of pulses of the initial pulse corresponds to the number of pulses of the multiple-time pulse, such as when the initial pulse is an initial six-pulse, the corresponding multiple-time pulse is a multiple-time six-pulse (i.e., 6N pulse, N is the preset multiple)

[0081] Next, multiple sub-pulses are superimposed on a preset pulse to obtain a multi-wavehead pulse.

[0082] Specifically, after obtaining the multiple-order pulse wave, it can be superimposed on a preset pulse wave to obtain a multi-wavehead pulse wave. It can be understood that, since the peak value of the multiple-order pulse wave is smaller than that of the preset pulse wave, adding the multiple-order pulse wave to the preset pulse wave results in a multi-wavehead pulse wave with multiple waveheads at the commutation moment, thereby achieving a rapid waveform rise and improving the power factor of the boost circuit.

[0083] It is understandable that the number of pulses of the multiple pulse wave and the preset pulse wave are corresponding. For example, when the input of the rectifier circuit is a three-phase AC voltage, the corresponding number of pulses of the multiple six pulse wave and the preset six pulse wave are obtained. At this time, the multiple six pulse wave can be superimposed on the preset six pulse wave to obtain a multi-pulse head six pulse wave.

[0084] 203. Feedforward compensation for boost circuit based on multi-wavehead pulse wave.

[0085] After obtaining the target pulse, feedforward compensation can be performed on the boost circuit based on the target pulse. That is, the target pulse can be used as the input voltage of the boost circuit, and the switching transistor in the boost circuit can be turned on or off by controlling the target pulse, so that the output voltage of the boost circuit is greater than the input voltage of the boost circuit, that is, the output voltage of the boost circuit is greater than the target simulated six pulse.

[0086] As can be seen, in this embodiment, the initial pulse output of the rectifier circuit is obtained, and the output terminal of the rectifier circuit is connected to the boost circuit; the initial pulse is phase-shifted, and the phase-shifted initial pulse is adjusted based on the peak value of the multi-phase AC voltage to obtain the target pulse; feedforward compensation is performed on the boost circuit based on the target pulse; this can effectively improve the power factor of the boost circuit. It is evident that by processing the initial pulse, the waveform tilt of the target pulse is made greater than that of the initial pulse; this allows for rapid output of the current waveform during commutation, improving the power factor of the boost circuit and thus increasing product efficiency.

[0087] Furthermore, taking the initial simulated pulse as an example, and combining it with the power factor optimization circuit diagram of the boost circuit, the power factor optimization process will be described in detail below. The power factor optimization process of Example 1 is as follows: Figure 2 As shown, the corresponding power factor optimization circuit is as follows: Figure 3 As shown, in Figure 3 This includes: a rectifier circuit 301, a boost circuit 302, and a buck circuit 303. The power factor optimization process of Example 2 is as follows: Figure 8 As shown, the corresponding power factor optimization process circuit is as follows: Figure 9 As shown, in Figure 9The rectifier circuit 901, the boost circuit 902, and a Buck circuit 903

[0088] Embodiment 1

[0089] 201, inputting the multiphase alternating voltage into a phase-locked loop to obtain a phase angle of a preset phase, and determining an initial analog pulse corresponding to the preset phase.

[0090] The feedforward compensation circuit of the boost circuit includes a phase-locked loop. The multiphase alternating voltage can be input into the phase-locked loop to obtain a phase angle of a preset phase in the multiphase alternating voltage. Specifically, the line voltage of the multiphase alternating voltage can be sampled and converted into a phase voltage, and the phase voltage can be subjected to Park transformation (abc / dq) to obtain a d-axis voltage Ud and a q-axis voltage Uq. After the d-axis voltage Ud and the q-axis voltage Uq are adjusted by a PI regulator (PLL PI), the frequency ωn of the multiphase alternating voltage is added and differentiated to obtain the phase angle θ of the preset phase. Then, the analog pulse of the preset phase can be obtained based on the phase angle θ of the preset phase, that is, max (Abs (sin (θ)) is the analog pulse of the preset phase, and the initial analog pulse corresponding to the preset phase can be obtained based on the analog pulse of the preset phase. For example, when the rectifier circuit inputs a three-phase alternating voltage, an initial analog six-pulse can be obtained, and the corresponding initial analog six-pulse is as shown in FIG. 2B. In the figure, the horizontal axis represents time, and the vertical axis represents voltage. Figure 4

[0091] After obtaining the initial analog pulse, the initial analog pulse can be phase-shifted based on a preset offset angle, and the phase-shifted initial analog pulse can be front-tilted. Specifically, the initial analog pulse can be shifted to the left or to the right, which is not limited here. Then, the phase-shifted initial analog pulse is front-tilted. Specifically, the waveforms corresponding to the phase-shifted initial analog pulse can be cut at a corresponding front-tilt angle, and the waveforms at the starting time and the commutation time are replaced by the cut surface. The waveform of each pulse after the cut surface is lowered from the highest point of the initial analog pulse, and the corresponding waveform on the cut surface rises rapidly, that is, the current waveform rapidly rises at each commutation time, so that the current waveform corresponding to the target analog pulse is front-tilted, and the current waveform is rapidly output at the commutation time, thereby improving the power factor of the boost circuit. Specifically, steps 202 and 203 are included.

[0092] 202, superimposing a preset offset angle on the phase angle of the preset phase to phase-shift the initial analog pulse.

[0093] ​In the embodiments of the present application, a preset offset angle Alfa can be superimposed on the phase angle θ of the preset phase to realize the offset of the phase angle, so that the initial simulation pulse is phase-shifted based on the preset offset angle. The preset offset angle can be any angle between negative 30 degrees and positive 30 degrees, which is not limited here. When the preset offset angle is positive, the initial simulation pulse is phase-shifted to the right; when the preset offset angle is negative, the initial simulation pulse is phase-shifted to the left. For example, the waveform of the initial simulation six-pulse phase-shifted to the right by 1 / 6π is as shown in FIG. 8. Figure 5

[0094] It can be understood that when the initial simulation pulse is an initial simulation six-pulse, the calculation formula of the initial simulation six-pulse is max(Abs(sin(θ)), Abs(sin(θ+2 / 3π)), Abs(sin(θ+4 / 3π)). When the formula is used to generate a six-pulse in an interrupt, a large amount of interrupt time resources is easily occupied. At this time, the simulation pulse obtained after the initial simulation pulse is phase-shifted can be obtained; the waveform interval of the preset phase is determined; and the initial simulation pulse after phase shift is obtained by intercepting the simulation pulse based on the waveform interval. For example, when the preset phase is phase A and the initial simulation pulse is an initial simulation six-pulse, the obtained simulation six-pulse is generated with phase A as a reference, and the waveform interval of phase A is π / 3-2π / 3. At this time, the waveform of the simulation six-pulse can be intercepted in the waveform interval, which can effectively reduce the interrupt time resources.

[0095] 203. Superimpose a preset offset angle on the phase angle of the preset phase in the initial simulation pulse after phase shift to perform front shaping on the initial simulation pulse after phase shift.

[0096] After the initial simulation pulse is phase-shifted, a preset offset angle Beta can be superimposed on the phase angle of the preset phase in the initial simulation pulse after phase shift, so that the initial simulation pulse after phase shift is front-shaped based on the preset offset angle, and the offset of the initial simulation pulse is realized. The preset offset angle can be any angle between negative 30 degrees and positive 30 degrees, which is not limited here. For example, when the initial simulation pulse is an initial simulation six-pulse, the initial simulation six-pulse is phase-shifted to the right by 1 / 6π, and the preset offset angle is 0.1π, the waveform of the corresponding simulation six-pulse is as shown in FIG. 9. When commutation occurs, the voltage rises rapidly. Figure 6

[0097] 204. Multiply the phase angle of the preset phase in the initial simulation pulse after shaping by a sine function and then by the peak value of the multi-phase alternating voltage to obtain a target simulation pulse.

[0098] ​​Next, the phase angle of the preset phase in the shaped initial simulated pulse can be multiplied by a sine function Sin and then by the peak value of the three-phase AC voltage (i.e., the peak value of the rectified pulse waveform) to obtain the target simulated pulse. It can be understood that a preset offset angle can be superimposed on the phase angle of the preset phase, and then a preset tilt angle can be superimposed, multiplied by a sine function, and then multiplied by the peak value of the multi-phase AC voltage to obtain the target simulated six-pulse wave. The peak value of the target simulated pulse wave is the same as the peak value of the actual rectified pulse wave. When the target simulated pulse wave is a target simulated six-pulse wave, the current waveform displayed on the oscilloscope is as follows: Figure 7 As shown, this current waveform is the input current waveform of the boost circuit. In the figure, the horizontal axis represents time, the vertical axis represents current, M 400ms indicates a horizontal scale of 400ms, the time difference between the three cycles of the waveform is 59.6ms, the current difference between the highest point and the zero point is 390A, 100A is the vertical scale, Z 10.0ms is the magnified horizontal scale, 1.25M times / second indicates the sampling rate, that is, the oscilloscope samples 1.25 million points per second, 5M points indicates the storage depth, that is, the number of points collected by the oscilloscope in one acquisition, rising edge trigger, the trigger level voltage value is 285V. Based on the scaling position of 1.54s and the scaling factor of 40X, the waveform magnified 40 times shows that the current rises or falls rapidly during commutation. By simulating a six-pulse wave to perform feedforward compensation on the boost circuit, the power factor of the boost circuit can be effectively improved.

[0099] 205. Controlling the switching transistors in a boost circuit based on target-simulated pulses.

[0100] After obtaining the target simulated pulse, the switching transistor in the boost circuit can be turned on or off based on the target simulated pulse. Specifically, the input voltage of the boost circuit can be replaced by the target simulated pulse, and the output voltage of the boost circuit can be subtracted from the target simulated pulse to obtain the target control signal. The switching transistor in the boost circuit can be turned on or off based on the target control signal, that is, the duty cycle of the switching transistor can be controlled so that the output voltage of the boost circuit is greater than the target simulated pulse (the input voltage of the boost circuit).

[0101] As can be seen, in Embodiment 1 of this application, the target simulated pulse (rectified six-pulse wave) is simulated by the phase angle of the preset phase output by the phase-locked loop. The target simulated pulse replaces the actual rectified voltage in the feedforward compensation, effectively avoiding sampling interference when sampling the actual rectified voltage. Furthermore, by phase shifting and forward tilting the initial simulated pulse, the current waveform corresponding to the target simulated pulse can be tilted forward, and the current waveform can be output quickly during commutation, thereby improving the power factor of the boost circuit.

[0102] Example 2:

[0103] 801. Input the multiphase AC voltage into the phase-locked loop to obtain the phase angle of the preset phase, determine the preset corresponding initial simulated pulse, and use the initial simulated pulse as the initial pulse.

[0104] In Embodiment 2 of this application, the feedforward compensation circuit of the boost circuit includes a phase-locked loop (PLL), which can input multi-phase AC voltage into the PLL to obtain the phase angle of a preset phase in the multi-phase AC voltage. Specifically, the line voltage of the multi-phase AC can be sampled and converted into phase voltage. The phase voltage is then subjected to Park transformation (abc / dq) to obtain the d-axis voltage Ud and the q-axis voltage Uq. The d-axis voltage Ud and the q-axis voltage Uq are adjusted by a PI regulator (PLL_PI), added to the frequency ωn of the multi-phase AC, and differentiated to obtain the phase angle θ of the preset phase. Then, the simulated pulse of the preset phase can be obtained based on the phase angle of the preset phase, i.e., max(Abs(sin(θ)) is the simulated pulse of the preset phase. Based on the simulated pulse of the preset phase, multiple corresponding initial simulated pulses can be obtained, and the initial simulated pulses are used as the initial pulses output by the rectifier circuit.

[0105] 802. Multiply the phase angle of the preset phase in the initial pulse after the first phase shift by a sine function and then by the peak value of the multiphase AC voltage to obtain the preset pulse.

[0106] In Embodiment 2 of this application, a preset offset angle Alfa is superimposed on the phase angle of a preset phase to achieve a phase angle offset, so that the initial pulse undergoes a first phase shift based on the preset offset angle. The preset offset angle can be any angle between -30 degrees and +30 degrees, and is not specifically limited here. When the preset offset angle is positive, the initial pulse shifts to the right; when the preset offset angle is negative, the initial pulse shifts to the left. It is understood that the initial pulse is the pulse output by the rectifier circuit after the multi-phase AC voltage is input into it. The preset phase in the multi-phase AC voltage and the preset phase in the initial pulse refer to the same phase voltage, which will not be elaborated further below.

[0107] Understandably, when the initial pulse wave is an initial six-pulse wave, the calculation formula for the six-pulse wave is max(Abs(sin(θ)), Abs(sin(θ+2 / 3π)), Abs(sin(θ+4 / 3π)). However, using this formula to generate a six-pulse wave during an interrupt can easily consume significant interrupt time resources. In this case, it's possible to obtain the first pulse wave after performing a first phase shift on the initial pulse wave; determine the waveform range of the preset phase; and extract the first pulse wave based on this waveform range to obtain the phase-shifted initial pulse wave. For example, if the initial pulse wave is an initial six-pulse wave and the preset phase is phase A, the obtained preset six-pulse wave is generated based on phase A. The waveform range of phase A is π / 3-2π / 3. In this case, the first pulse wave can be extracted within this waveform range, effectively reducing interrupt time resources.

[0108] Then, the preset phase angle of the first phase-shifted initial pulse is multiplied by a sine function Sin and then multiplied by the peak value of the multi-phase alternating voltage (i.e. the peak value of the rectified pulse waveform) to obtain a preset pulse. It can be understood that after obtaining the phase angle of the preset phase output by the phase-locked loop, the preset phase angle can be directly superimposed with a preset offset angle, and after superimposing the preset offset angle, multiplied by the sine function, and then multiplied by the peak value of the multi-phase alternating voltage to obtain the preset pulse, so that the peak value of the obtained preset pulse is the same as the actual rectified pulse peak value, and the accuracy of the feedforward compensation is improved.

[0109] 803、The phase angle of the preset phase in the frequency-doubled initial pulse is multiplied by a sine function and then multiplied by the preset pulse peak value to obtain a multiple-order pulse.

[0110] In the embodiment 2 of the present application, the initial pulse can be subjected to a second phase shift based on a target offset angle, which can be any angle between negative 30 degrees and positive 30 degrees, and the specific value is not limited here. The initial pulse after the second phase shift is multiplied by a preset multiple for frequency doubling processing. When the initial pulse is an initial six-pulse and the preset multiple is 6, the corresponding multiple-order pulse is a multiple-order six-pulse (36-pulse). It can be understood that the multiple-order pulse has a corresponding waveform interval. In order to reduce the number of interrupt calculations and save interrupt time resources, a second pulse obtained by frequency doubling the initial pulse after the second phase shift can be obtained. The waveform interval of the multiple-order pulse is determined, and the second pulse is intercepted based on the waveform interval to obtain the frequency-doubled initial pulse. When the multiple-order pulse is a multiple-order six-pulse, the corresponding waveform interval is (π / 2-π / 6N)~(π / 2+π / 6N), where N is the preset multiple.

[0111] Then, the preset phase angle of the first phase-shifted initial pulse is multiplied by a sine function Sin and then multiplied by the peak value of the multi-phase alternating voltage (i.e. the peak value of the rectified pulse waveform) to obtain a preset pulse. It can be understood that after obtaining the phase angle of the preset phase output by the phase-locked loop, the preset phase angle can be directly superimposed with a preset offset angle, and after superimposing the preset offset angle, multiplied by the sine function, and then multiplied by the peak value of the multi-phase alternating voltage to obtain the preset pulse, so that the peak value of the obtained preset pulse is the same as the actual rectified pulse peak value, and the accuracy of the feedforward compensation is improved.

[0112] 804、The multiple-order pulse is superimposed on the preset pulse to obtain a multi-head pulse.

[0113] After obtaining the multiple-order pulse, the multiple-order pulse can be superimposed on the preset pulse to obtain a multi-head pulse. For example, a multiple-order six-pulse (6N-pulse) can be superimposed on a preset six-pulse (6-pulse) to obtain a multi-head six-pulse. The multi-head six-pulse isFigure 10 As shown in the figure, the horizontal axis represents time and the vertical axis represents voltage. It can be seen that the waveform of this multi-wavehead six-pulse wave has multiple waveheads during the rising or falling process.

[0114] The multi-wavehead six-pulse waveform serves as the input voltage of the boost circuit, and the corresponding current waveform (i.e., the input current waveform of the boost circuit) is as follows: Figure 11 Waveform 2 in the figure (light blue waveform) is the waveform displayed on an oscilloscope. The meanings of the corresponding parameters on the oscilloscope are the same as those mentioned above. Figure 1 Similar descriptions are given, and details will not be repeated here. It is understandable that by changing the phase shift angle of the preset six-pulse wave, the phase shift angle of multiple six-pulse waves, and their amplitude, the input current waveform of the boost circuit can be made into a multi-peak form, as shown in waveform 2. This current waveform rises or falls rapidly and has multiple peaks or troughs, effectively reducing the ripple of the boost circuit's output voltage. In the figure, waveform 1 (the dark blue waveform) is the three-phase AC voltage waveform, waveform 3 (the purple waveform) is the output voltage (bus voltage) waveform of the boost circuit, and waveform 4 (the green waveform) is the output current waveform of the buck circuit.

[0115] 805. Feedforward compensation for boost circuit based on multi-wavehead pulse wave.

[0116] After obtaining the multi-wavehead pulse, the switching transistor in the boost circuit can be controlled to turn on or off based on the multi-wavehead pulse. Specifically, the input voltage of the boost circuit can be replaced by the multi-wavehead pulse, and the output voltage of the boost circuit can be subtracted from the multi-wavehead pulse to obtain the target control signal. The switching transistor in the boost circuit can be controlled to turn on or off based on the target control signal, that is, the duty cycle of the switching transistor can be controlled so that the output voltage of the boost circuit is greater than the multi-wavehead pulse (the input voltage of the boost circuit).

[0117] As can be seen, in Embodiment 2 of this application, the preset pulse is modified by adding multiple sub-pulses for compensation. The added multiple sub-pulses have phase shifting and amplitude change functions. By phase shifting and superimposing the multiple sub-pulses on the preset pulse, multi-pulse compensation can be achieved for the preset pulse. By modifying the pulse and increasing the number of pulse fronts, the multi-pulse pulse serves as the input voltage of the boost circuit, which simultaneously increases the number of input current fronts of the boost circuit. This makes the waveform tilt of the target pulse greater than that of the initial pulse, enabling rapid output of the current waveform during commutation, improving the power factor of the boost circuit, thereby improving product efficiency, and simultaneously reducing the ripple of the output voltage (bus voltage) of the boost circuit.

[0118] This application also provides a power factor optimization device, such as... Figure 12 As shown,

[0119] The acquisition unit 1201 is configured to acquire an initial pulse wave output by a rectifier circuit after inputting a multi-phase alternating voltage into the rectifier circuit, wherein an output end of the rectifier circuit is connected to the boost circuit.

[0120] The adjustment unit 1202 is configured to perform phase shift processing on the initial pulse wave, and adjust the initial pulse wave after the phase shift processing based on a peak value of the multi-phase alternating voltage to obtain a target pulse wave, so that a waveform inclination of the target pulse wave is greater than a waveform inclination of the initial pulse wave.

[0121] The compensation unit 1203 is configured to perform feedforward compensation on the boost circuit based on the target pulse wave.

[0122] Embodiments of the present application further provide a power factor optimization device 1300, as shown in the accompanying drawings, the power factor optimization device 1300 can include one or more central processing units (CPU, central processing units) 1301 and a memory 1302, the memory 1302 stores one or more application programs or data. Figure 13

[0123] The memory 1302 can be volatile storage or persistent storage. The programs stored in the memory 1302 can include one or more modules, each module can include a series of instruction operations in the electronic device. Further, the central processing unit 1301 can be configured to communicate with the memory 802 and execute a series of instruction operations in the memory 1302 on the power factor optimization device 1300.

[0124] The power factor optimization device 1300 can further include one or more power supplies 1305, one or more wired or wireless network interfaces 1304, one or more input / output interfaces 1303, and / or one or more operating systems, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, etc.

[0125] The central processing unit 1301 can perform the operations performed by the first aspect or any specific method embodiment of the first aspect, and the specific details are not repeated here.

[0126] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0127] ​In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the described device embodiments are merely schematic. The division of the units is merely a logical function division. There can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between the units can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0128] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments of the present application.

[0129] In addition, each functional unit in the embodiments of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of software functional units.

[0130] When the integrated unit is implemented in the form of software functional units and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such an understanding, the technical solutions of the present application essentially or partly, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage medium includes: U disk, mobile hard disk, read-only memory (ROM, read-only memory), random access memory (RAM, random access memory), magnetic disk or optical disk, and various other media that can store program codes.

Claims

1. A power factor optimization method characterized by, The method comprises the following steps: obtaining an initial pulse wave output by a rectifier circuit after inputting a multi-phase alternating voltage into the rectifier circuit, wherein an output end of the rectifier circuit is connected to a boost circuit; phase-shifting the initial pulse wave and adjusting the phase-shifted initial pulse wave based on a peak value of the multi-phase alternating voltage to obtain a target pulse wave, so that a waveform inclination of the target pulse wave is greater than a waveform inclination of the initial pulse wave; performing feedforward compensation on the boost circuit based on the target pulse wave; the phase-shifting the initial pulse wave and adjusting the phase-shifted initial pulse wave based on the peak value of the multi-phase alternating voltage to obtain the target pulse wave comprises: phase-shifting the initial pulse wave based on a preset offset angle and performing forward tilting shaping on the phase-shifted initial pulse wave to adjust the shaped initial pulse wave based on the peak value of the multi-phase alternating voltage to obtain the target pulse wave; after the phase-shifting the initial pulse wave based on the preset offset angle, the method further comprises: obtaining a pulse wave obtained after phase-shifting the initial pulse wave; determining a waveform interval of a preset phase in the multi-phase alternating voltage; obtaining the phase-shifted initial pulse wave by intercepting the pulse wave based on the waveform interval; the adjusting the phase-shifted initial pulse wave based on the peak value of the multi-phase alternating voltage to obtain the target pulse wave comprises: multiplying a phase angle of the preset phase in the multi-phase alternating voltage by a sine function, and then multiplying the peak value of the multi-phase alternating voltage to obtain the target pulse wave.

2. The power factor optimization method of claim 1, wherein, the obtaining the initial pulse wave output by the rectifier circuit comprises: obtaining an initial analog pulse wave output by the rectifier circuit based on a phase angle of a preset phase in a multi-phase alternating voltage input into the rectifier circuit, and taking the initial analog pulse wave as the initial pulse wave; or, sampling at the output end of the rectifier circuit to obtain the initial pulse wave.

3. The power factor optimization method of claim 1, wherein, the performing forward tilting shaping on the phase-shifted initial pulse wave comprises: superimposing a preset offset angle on a phase angle of the preset phase in the phase-shifted initial pulse wave to make the phase-shifted initial pulse wave perform forward tilting shaping based on the preset offset angle.

4. The power factor optimization method of claim 1, wherein, the phase-shifting the initial pulse wave and adjusting the phase-shifted initial pulse wave based on the peak value of the multi-phase alternating voltage to obtain the target pulse wave comprises: performing first phase-shifting on the initial pulse wave and adjusting the first phase-shifted initial pulse wave based on the peak value of the multi-phase alternating voltage to obtain a preset pulse wave; performing second phase-shifting on the initial pulse wave, performing frequency doubling processing on the second phase-shifted initial pulse wave, and adjusting the frequency-doubled initial pulse wave based on a preset pulse wave peak value to obtain a multiple-frequency pulse wave; wherein the preset pulse wave peak value is less than the peak value of the multi-phase alternating voltage; superimposing the multiple-frequency pulse wave on the preset pulse wave to obtain a multiple-head pulse wave, and taking the multiple-head pulse wave as the target pulse wave.

5. The power factor optimization method of claim 4, wherein, after the first phase-shifting on the initial pulse wave, the method further comprises obtaining a first pulse wave obtained after the first phase-shifting on the initial pulse wave; determining a waveform interval of a preset phase in the multi-phase alternating voltage; obtaining the first phase-shifted initial pulse wave by intercepting the first pulse wave based on the waveform interval; The method further comprises: obtaining a second pulse wave obtained by multiplying the second phase-shifted initial pulse wave; determining a waveform interval of the multiple times pulse wave; obtaining the multiple times pulse wave by intercepting the second pulse wave based on the waveform interval.

6. The power factor optimization method of claim 4, wherein, The method further comprises: obtaining the preset pulse wave by multiplying the phase angle of the preset phase in the first phase-shifted initial pulse wave by a sine function and then by the peak value of the multi-phase alternating voltage; The method further comprises: obtaining the multiple times pulse wave by multiplying the phase angle of the preset phase in the multiple times initial pulse wave by a sine function and then by the preset pulse wave peak value.

7. A power factor optimization device, characterized by, The method further comprises: an obtaining unit configured to obtain an initial pulse wave output by a rectifier circuit after the rectifier circuit inputs a multi-phase alternating voltage, wherein an output end of the rectifier circuit is connected to a boost circuit; an adjusting unit configured to perform phase shift processing on the initial pulse wave, and adjust the initial pulse wave after the phase shift processing based on a peak value of the multi-phase alternating voltage to obtain a target pulse wave, so that a waveform inclination of the target pulse wave is greater than a waveform inclination of the initial pulse wave; wherein the adjusting unit is configured to perform phase shift on the initial pulse wave based on a preset offset angle, perform front-leaning shaping on the initial pulse wave after the phase shift, and adjust the shaped initial pulse wave based on the peak value of the multi-phase alternating voltage to obtain the target pulse wave; after performing phase shift on the initial pulse wave based on the preset offset angle, the adjusting unit is further configured to obtain a pulse wave obtained by performing phase shift on the initial pulse wave, and determine a waveform interval of a preset phase in the multi-phase alternating voltage; intercept the pulse wave based on the waveform interval to obtain the initial pulse wave after the phase shift; and obtain the target pulse wave by multiplying the phase angle of the preset phase in the initial pulse wave by a sine function and then by the peak value of the multi-phase alternating voltage; a compensation unit configured to perform feedforward compensation on the boost circuit based on the target pulse wave.

8. A power factor optimization apparatus characterized by comprising: The method further comprises: a central processing unit, a memory, an input and output interface, a wired or wireless network interface, and a power supply; the memory is a transitory storage memory or a persistent storage memory; the central processing unit is configured to communicate with the memory, execute instruction operations in the memory on a control plane function entity, and perform the method in any one of claims 1 to 6.

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