TW201218604A - capable of providing low harmonic distortion and high efficiency three-phase AC power source - Google Patents

Abstract

The parallel connection architecture of the method and device of modularized single-phase to three-phase three-layer current source frequency converter proposed by the present invention is shown in figure 1. By omitting the architecture of the prior art as shown in figure 2 which uses upper and lower inductors to balance the level of the output current at each layer, the disclosed architecture can be used in parallel for multi-modularization to extend the output current layer so as to form a three-phase multi-layer current source frequency converter. Therefore, in the field of high-power application, the multi-layer frequency converter architecture is used to distribute the output capacity to a plurality of power switch components, thereby reducing the voltage/current switching stress on each switch component, and the output waveform of approximate sine wave synthesized by multi-layer waves is used to reduce the harmonic quantity contained in the output waveform. The present invention makes use of the selective harmonic elimination pulse-width modulation (SHE-PWM) to control the three-phase five-layer current source frequency converter system, and generates a low-distortion three-phase sine wave output current through a parallel-connected resonance circuit. The system architecture is composed of two three-layer current source frequency converters connected in parallel. The design of pulse-width modulation makes use of Newton-Raphson method to determine a specific angle for the on/off switching, which is used as a trigger signal for the on/off switch of the five-layer current source frequency converter, so as to satisfy the requirement of harmonic design. The determined specific angle can be used to eliminate n non-triple-frequency odd-order specific harmonics, such as the fifth harmonic, seventh harmonic, eleventh harmonic, thirteenth harmonic, and so on. By using the phase shift between modules to further eliminate the (n+1)-th odd-order specific harmonic, and also taking two angles of 30 degrees and 60 degrees for programming, it is able to further eliminate (3xn)-th harmonics, i.e., the third harmonic, ninth harmonic, fifteenth harmonic, and so on.

Description

201218604 VI. Description of the Invention: [Technical Fields According to the Invention] The present invention relates to a multi-layer current source for a specific harmonic elimination, such as _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The method and device of the frequency converter, the invention proposes a modular single-phase AC power supply to a three-phase three-layer current source to turn into parallel _, omitting the existing literature 赖+, using the upper and lower Lu inductors to balance the output current levels of each level, At the same time, it can also be used in multiple modules in parallel, and the second output of the electric core layer is called the three-phase multi-level current source inverter. Therefore, at = the force rate should be expected. In the multi-layer inverter architecture, the output capacity is dispersed on the power switch components of the squad, the color and current switching on each _ component are reduced, and the approximate sine wave output waveform synthesized by the external wave is used and used. The pulse width of a particular spectral cancellation is modulated to reduce the harmonic content of the output waveform. [Prior Art] _ In the work _ domain towel 'in the traditional: tier change (four) shawl, often use the increase of switching frequency square wire to reduce the amount of harmonics of the (four) face money, but in high power applications 'power casting components must Withstand high voltage and high current switching, and have a long switching time 'so the switching frequency is lower than normal, so that its output power (four) current contains a smaller amount of harmonics 'easy to affect power quality. In addition, it is limited by the power semiconductor component process technology Wei neck, the power material conductor components have _, the resistance to flow and the switching speed limit 'If you want to pursue high pressure, flow and secret speed, the price of the components is often not Cheap. 201218604 Therefore, when used in high-power applications, the multi-level inverter architecture is used to spread the output capacity across multiple sets of power switching elements, reducing the voltage and current stress on each switching element, and multi-level composite output waveforms. To reduce the total harmonic content of the output waveform. Most components of multi-level inverters are composed of switching devices and capacitive voltage sources. 'Step output waveforms with low wave distortion are generated by appropriate control switching devices'. The shortcomings of the pulse width modulation, φ mesh is widely used and recognized by the manufacturer as a new power conversion method. The general commercial multi-variable _ architecture can be roughly divided into: staggered light hybrid structure and multi-level There are two main types of current source architectures. The single-phase multi-level voltage source inverter architecture can be divided into two-phase clamp-type (neutral-p〇int-damped, Νρρ, capacitive clamp (finging capacitor, FQ and series bridge). Architecture (cascaded H_bridge, CHB), etc. These three architectures can also be extended to three-phase systems. The architecture of the research literature for three-phase multi-level current source inverters is shown in Figure 2. This circuit architecture can extend its The current level is up to the 2 state level (which is a positive integer). Also, due to the multi-level current source inverter architecture, it is considered that each power semiconductor component needs to be uniformly distributed to withstand the magnitude of the current flowing, and the power semiconductor component is reduced. The current switching stress is also convenient in selecting the power semiconductor component level. The three-phase five-layer current source inverter architecture proposed in this patent improves the current of the power semiconductor component in the circuit structure of the multi-level current source inverter in the research literature. Disadvantages of uneven distribution, and thus improve the energy and life; and the pulse width modulation strategy of eliminating the spectrum wave elimination 'eliminating specific harmonics and controlling the three-phase five-level power supply change' [S ] 5 201218604 frequency converter output SUMMARY OF THE INVENTION The object of the present invention is to provide a three-phase AC power supply with lower Wei distortion, high efficiency, and suitable for two power applications, and reduce the use of the upper and lower _ to balance the output current levels in the existing literature architecture. Therefore, in high-power applications, • use this multi-level inverter architecture, in addition to distributing the output capacity across multiple sets of power switch components, reducing the voltage and current switching stress on each switching element, and borrowing The multi-order wave is combined with the red yucca, and the spectral wave content of the output waveform of the harmonic wave is low. The pulse width of the line wave is eliminated by the present invention. Modulation (sdectiv Harmomc Ehmination Pulse - Width Modulation, SHE-PWM)*^|

The two-phase five-layer current source inverter system is then passed through a parallel resonant circuit to produce a sinusoidal sine wave output current. The system architecture consists of two sets of three-ride current source inverters. The pulse width view of the coffee café, Rui Si _ 啦 _ 〇 _ ) ) ) 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求 求It is expected that the degree of joy can be eliminated and eliminated. "A non-three-frequency singular reading wave (such as the fifth, seventh, ten-, thirteenth, etc.), and the phase shift of the butterfly _ Specific spectral wave. In addition to the specific 30 degrees and 6G degrees, it is possible to make 3 χ n harmonics, that is, three, nine and fifteenth harmonics. 201218604 The switch drive circuit 107, the current sense circuit i〇9, and the absolute value average turn-off circuit 11〇 are composed of analog components such as resistors, capacitors, operational amplifiers, and optically coupled isolation drivers. The current and voltage sensing circuit primarily converts the actual current and voltage into an acceptable signal range for the analog/digital module within the digital microprocessor. The digital implementation can use a digital signal processor (DSP) and a programmable logic element (CPLD) digital controller to process the feedback signal, the debt measurement, the operation, and the trigger signal command to provide the switch, and The power switch drive circuit drives the power on/off of the converter to complete the control drive of the present invention. The digital signal processor using the digital controller of the present invention is TMS320F2812, and the programmable logic component is ispMACH 4256V. The power switch used in the converter of the present invention is composed of a high power semiconductor component such as a gate insulated bipolar transistor (IGBT) or a bipolar junction transistor (BJT). [Embodiment] The circuit architecture of the system of the present invention is as shown in the figure! As shown, it can be divided into two parts, the former stage and the latter stage. The DC current source output of the former stage is composed of a single-phase full-bridge rectifier circuit 1〇3 and a DC-to-DC buck converter 104, which uses current hysteresis control to make it a controllable money wire; Three-phase electric current_inverter 105. The DC current source provided by the pre-stage is converted into an AC waveform for specific test elimination, and the secret frequency: the eliminated pulse width whip strategy plus numerical analysis method, the specific angle solution is obtained as the trigger of the two module switch Signal. The multi-level output current of the two modules and 201218604 is combined, and after being amplified by Q times by the parallel resonant circuit 106 (Q is the resonance quality factor of the system, that is, the rising current rate of the circuit), a three-phase sine wave output current is generated.

f first module A is regarded as a constant current source, the output current is three-phase third-order: kk 'α3 'core group B is regarded as constant current source b, output current is 4l of three-phase three-level, and heart And equal to ~, the final output module A and module B output current is the three-phase five-level heart, ^, its output current has factory H / /2, / five current levels, where the current 鹆 and _ sum. The power flow is subjected to the same flow level as the f flow. The operating principle of the three-phase ^-level current source inverter structure can be explained by the output power residual lang_change state of Table 1. The output state of the table can be divided into three ratios ^6, #7~#12细〜#18. Output state #1 to #6 three-phase current = H / 'output state #7 ~ #12 three-phase current level is = there are two switch switching modes; output fine ~ #18 three-phase current bit ° use After the output of the output states #1 to #18 is synthesized, the second gradation can be obtained. Since the output state #2~#—^ #13: 3, the mode of operation is the same. Therefore, the following will only analyze and explain the working mode of the needle_meal #13. ~, ΓΓ:: At this time, the switch three-phase wheel is powered out: second, the current conduction path is as shown in Figure 6. 'Work mode #7: Switch? , c ^ 1 off conduction m (5) 8 201218604 working mode #7: open and ~ ς „ α2 ' ύα3 ' «5 m5 and & are wearing, the current conduction path is shown in Figure 7: =, (four) conduction, ~, " , , , 22 or 2 _ change mode (4) Working mode #13: The scale switch is turned on, n core, m & and & are off, current conduction path such as (four) lion 3, two-phase output current & = 0 ϋ 2 Zc = / /2. The shape of the w- lion tender function function wave hundred (output current is the input line side of the converter DC link current 77 M 1,0,0 and -1.0 three levels to represent, can eliminate "non-triple shot: person-specific Wei (such as the fifth, seventh, ten, thirteenth, ... and other harmonics), and borrow the domain == target: then eliminate the "quote +1 odd-weight harmonics" plus 3G degrees and 60 degrees = = = as a condition of _ design, can be removed from _% of the spectrum, that is, the second, the ninth harmonic, etc.. Such as (four) hemp 'for the branch profile with 30 side of the tender coffee, secret group B For the module corner household ^ phase shift - a free angle sum, as shown in Figure η. Three free two can be (four) from the clear wave content. Xiaoling and module _ output waveform synthesis is the system's five-level output waveform Among them, the Α Α 岐 级 触 分 柯 柯 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I - - - =\ Since AO) is a quarter-cycle symmetric odd function, so aA〇=aAh=() for/z=l,2,...,〇o (2) yAh for /z=2,4,... ,〇o 'Ah

0 —icostej - cos ha2 +cos/z30° hn 1 -cos /z(60° -a2)+cosh(60° - a, )| for /z=l,3,...,〇〇(3)(4)(5) The Fourier analysis of the module Β output waveform can be expressed as (6) /β(ή =^saB〇+X{^cos(/Kar)+^sin(to)} Z h=\ Since it is a half-wave periodic function, aBQ = aBh=bBh=0 for /2=2,4,...,00 (7) -4 a

Bh - ^ {coshax - cosha2 + cos/z30° - cos/z(60° -a2) +cosh(60° - ax )| sinhaz for /z=l,3,.··,〇〇(8) 4 〇〇 bBh =—{cos/za, - cosha2 +cos/z30° -cos/z(60° -a2) (9) +cos /z(60° - a{) J cos ha^ for/z=l,3,. ..,〇〇00 201218604 Therefore, ^ έ Cos^hcot) + bBh sin( to)} (10) = (: is 0) can be Mll), that is, the output waveform of module A and module B is analyzed by Fourier analysis as follows /〇-(0 = Λ(〇+/β(ί) 00 =Σ(3⁄4c〇s(to) + + bBh)sm(hat)} 00 /』) is the system of the system for the transfer of coffee, This equation is a non-linear listening. The money wave content can be expressed as f〇r^Uv..>00 (12) In this patent, since the fundamental wave content of the output waveform of the system is controlled by the pre-stage DC key The 'magic x subharmonic component does not exist. Therefore, the lowest three Wei components of the system waveform are the fifth, seventh and eleven. By the above, the fifth, seventh and tenth times The slave is the component of the Wei that is to be eliminated, that is, 7 5 Γ 7 0 1 0. The free angle can be obtained by using the formulas (4), (8), (9) and (12): Simultaneous She, ^ and 3疋11 obtained because the silk group is a non-nucleus function, the Norton-Rifson numerical analysis method has a fast convergence, and the purpose of this special forging Wei-Rui Fusen method to obtain the simultaneous strain group The free angle solution. The three sets of free angle solutions are obtained by the blanking of the fresh mold filaments, as shown in Table 2. Since the first set of solutions has the smallest harmonic distortion, the 'fourth lake' Implement the theory and architecture proposed by the present invention. 201218604

In addition, in order to provide a high output current of the three-phase sine wave, the parallel resonant circuit is used to amplify the output current of the three-phase fifth-order (four) nu, which is determined by the Q value of the parallel resonant circuit. The q value is the resonant frequency of the parallel resonant circuit, the series equivalent inductance value center and its winding internal resistance value. (In order to facilitate the calculation of the Q value of the parallel resonance, the actual series equivalent inductance and its winding internal resistance will be It is equivalent to the parallel equivalent inductance and its winding internal resistance. The conversion relationship is rs = {_rs + (2^r/ XI, ) 2 / rs (13) ^=[Κ+(2π/χΣγ/ (2π/ΥΣ] (14) where / is the system frequency of the five-level output current. Since the system wants to generate a high output current 'so the 'frequency' will be controlled at the spectral frequency of the parallel spectrum circuit, generating resonance to obtain three The high output current of the sine wave, the resonance frequency is calculated as follows (15) where c is the value of the parallel resonant capacitor. Therefore, using equations (13)-(15), the q value can be calculated as Q = rJ2Kf0i (16) The TMS320F2812 program flow of the present invention is as shown in Fig. 12_丨. Firstly, the peripheral control register function is set first and the event management module is used to set the interrupt frequency of the system to 21.6 kHz and the complex programmable logic elements are tender (^ The external input clock used by the 4256V is 2.16MHz. When the counter is interrupted, it enters Disconnect the subroutine, as shown in Figure 12-2. Turn on the analog digital conversion channel, convert the current feedback signal from analog to digital value, and execute S] 12 201218604 DC current chirping _ type and execution input (four) stream (4) subroutine. · L motor source turtle type. Read the current command value n. When Q a is greater than the magnetic limit of the upper limit of the yoke, when the switch is turned on, when the above state does not match α, the switch maintains the original state, k also To do so, as shown in Figure (5)

Output AC current control _ type: read current command value _, assuming the system is balanced one-phase output 'This patent takes W to control, when, Χ reduces the two modules before the controllable straight motor 叩7, 胄w : If the controllable DC current of the two modules is increased, the controllable DC current command of the two modules is unchanged, as shown in Figure 12-4. The noisy programmable _ component program touches, as shown in Figure 12_5. First set the output switch switch body table. The external input clock is 2.16ΜΗζ, which is controlled by positive feedback. When the positive edge triggers-time, the frequency division counter + the switching angle of the invention needs to be switched under a specific limb. The accuracy reaches two decimal places. In order to facilitate integer arithmetic, and the output AC current frequency is Guanyu, the time of one cycle is divided into 36〇χ100 degrees, so the unit time of each counting angle is j^_= 4629 36000, which is equal to the external input clock. 2.16MHz. When the divide counter is greater than 36 〇 (8), the counter is reset to zero 'recount. When the division counter is less than 3 嶋, the count value is the angle corresponding to the switch to switch. The invention proposes a modular single-phase power to three-phase three-layer current source inverter parallel architecture', and can also be used in multiple modules in parallel, extending its wheel current level to form a three-phase multi-level current source inverter, and Use pulse width adjustment of specific harmonic elimination [S] 13 201218604 Change to control three-phase five-level current source inverter system 'to eliminate multiple (the invention is here five times, seven times, eleven times as an example) and Harmonics. Therefore, in high-power applications, 'distribute the ttl capacity across multiple sets of power-off components, reduce the dependence on each switching element, and approximate the sine-wave output waveform by multi-order wave recombination. And eliminate specific harmonics to reduce the harmonic content of the output waveform. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall system architecture diagram of the present invention; FIG. 2 is a three-phase five-layer current source inverter architecture proposed in the research literature; FIG. 3 is a power switching component driving circuit of the present invention; The current sensing circuit of the present invention; FIG. 5 is an absolute value average output circuit of the present invention; FIG. 6 is a current conduction path of the working mode #1 of the present invention; FIG. 7 is a current conduction path of the Wei Lai #7 of the present invention. 8 is the working mode of the present invention #7 current conduction path 2; Chunmu 9 is the invention: L side fine 3 electric material passage path; FIG. 10 is the module A planning output waveform of the present invention; Invented module A and mode level recording output waveform; Figure m, 12-2, 12-3, 12-4, 12-5 are the digital controller program flow of the present invention; Table 1 is the output current level and switching State table Table 2 quarter-cycle symmetry switching angle except fifth, seventh and eleventh harmonic 201218604 [Main component symbol description] 101: system hardware circuit device 102: single-phase power supply 103: single-phase full-bridge rectifier circuit 104: DC to DC buck converter 105: three-phase converter 106: and Resonant circuit 107: power switching element drive circuit • 108: digital controller (TMS320F2812, ispMACH4256V) 109: current sensing circuit 110: absolute value average output circuit 201: bridge rectifier 202: filter 203: IGBT power switch original 204: Inductor 205: Fast Recovery Diode® 206: Spectral Capacitance 207: Resonant Inductor 208: Light Coupler 209: Current Sensing Element 210: Operational Amplifier 211: Operational Amplifier 212: Diode vs: Single Phase Power Input [S1 15 201218604 //) C_a : A module constant current source

Zz)c_i^ B module constant current source B, heart 2, L: A module three-phase converter wheel current Core 1,42, L: B module three-phase converter output current

Lb, zc: three-phase five-level output current synthesized by A module and B module. 7. Patent application scope: Frequency device

A method and device for modularized single-phase to three-phase multi-layer current change of specific harmonic elimination, comprising two sets of single-phase full-bridge rectifier circuits: consisting of a bridge rectifier and a filter capacitor, providing an A module and B module DC voltage source. Two sets of DC-to-DC buck converters: consisting of power semiconductor components, providing A-mode and B-module constant current sources. Two sets of two-phase converters: composed of power semiconductor components, the output waveforms of the A and B modules are combined three-phase five-layer output waveforms. φ control and drive circuit. It comprises a power switch source drive circuit, a digital microprocessor, a complex programmable logic component, two current sense circuits, an absolute value average turn-off circuit, and an output converter power switch. Drive signal. Two-phase parallel resonant circuit: amplifies the output current of a three-phase five-level converter. 2. The current-level current source frequency converter for use in high-power specific harmonic elimination as described in claim 1 of the patent application, wherein two sets of constant current sources and two sets of three-phase current transformers are connected in parallel. 3. For use in high power specific harmonic cancellation as described in claim 1

Claims (1)

201218604 //)C_a : A module constant current source Zz)c_i^ B module constant current source B, heart 2, L: A module three-phase converter wheel current core 1,42, L: B module Three-phase converter output current Lb, zc: Three-phase five-layer output current synthesized by A module and B module Seven, patent application scope: Frequency A method and device for modularized single-phase to three-phase multi-layer current change of specific harmonic elimination, comprising two sets of single-phase full-bridge rectifier circuits: consisting of a bridge rectifier and a filter capacitor, providing an A module and B module DC voltage source. Two sets of DC-to-DC buck converters: consisting of power semiconductor components, providing A-mode and B-module constant current sources. Two sets of two-phase converters: composed of power semiconductor components, the output waveforms of the A and B modules are combined three-phase five-layer output waveforms. φ control and drive circuit. It comprises a power switch source drive circuit, a digital microprocessor, a complex programmable logic component, two current sense circuits, an absolute value average turn-off circuit, and an output converter power switch. Drive signal. Two-phase parallel resonant circuit: amplifies the output current of a three-phase five-level converter. 2. The current-level current source frequency converter for use in high-power specific harmonic elimination as described in claim 1 of the patent application, wherein two sets of constant current sources and two sets of three-phase current transformers are connected in parallel. 3. The multi-layer current source inverter used in the high-power specific harmonic elimination 201218604 as described in claim 1 of the patent application, wherein the current sensing circuit and the absolute value average output circuit of the driving device are controlled, and the system is The medium-current-converted low-voltage electrical signal 're-adjusts the amplitude to an appropriate value to provide a basis for controlling the drive wire to deliver (four) off the drive signal. ° 4. If you apply for the special-purpose _ _ 丨 丨 麟 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高The high-power solid-state power-driven sub-driver of the converter produces a three-phase five-P all-layer output waveform. 5. For the device of the multi-level current source inverter of the high power specific spectral wave elimination as described in the fourth paragraph of the patent application scope, 'the digital microprocessor device detects the current feedback ## after generating the switch drive signal The high-power solid-state electronic switch that drives the converter enables the front-end current source to have a controllable function to control the current. 6. The apparatus for multi-level current source frequency converters for high-resolution-specific spectral cancellation according to the first aspect of the patent application, wherein the power relationship of the converter is a high-power-rate solid-state electronic switch, and the electronic relationship It consists of power semiconductor components. 7. If you apply for the specific three-phase five-layer current waveform of the specific Wei elimination described in Item 1, you can not include triple frequency (3x« times), multiple (w+1) non-triple frequency (five times) , seven times, eleven times ...) and even spectral components, the waveform is (丨丨). 8. For example, the single-phase AC power to three-phase three-layer current source inverter parallel architecture of the grouped patent scope is omitted. In the existing literature structure, the upper and lower inductors are used to balance the output current levels. It can also be used in parallel with multiple modules to extend its output current level to form a three-phase multi-level current source inverter. "... [S]