CN102480243B - Direct current component control method and system used for three-phase or single-phase inverter - Google Patents
Direct current component control method and system used for three-phase or single-phase inverter Download PDFInfo
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Abstract
The invention provides a direct current component control method and system used for a three-phase or single-phase inverter, wherein the method used for the three-phase inverter comprises the following steps: detecting the output voltage and direct-current component of the three-phase inverter; carrying out conversion from static coordinates to rotational coordinates on the direct current component so as to obtain a component of the direct current component on the rotational coordinates; calculating a direct voltage adjusted value according to the component of the direct current component on the rotational coordinates and a direct current voltage given value, and calculating the voltage given value according to the direct voltage adjusted value and a reference output voltage; calculating the output regulation voltage of the three-phase inverter according to the voltage given value and the output voltage of the three-phase inverter, and carrying out conversion from the rotational coordinates to the static coordinates on the output regulation voltage of the of the three-phase inverter and carrying out PWM (pulse-width modulation) so as to obtain driving signals of the three-phase inverter; and carrying out driving control on the three-phase inverter according to the driving signals. The method and system provided by the invention can be used for effectively reducing the direct-current component in the output voltage of the inverter so as to adapt to load requirements.
Description
Technical field
The present invention relates to Electric Manufacture technical field, particularly a kind of direct current component control method for three-phase or single-phase inverter and system.
Background technology
Sinewave inverter is widely used in the fields such as uninterruption power source (UPS), frequency converter, load-carrying kind becomes more diverse, this will ask the output of inverter should be pure sine wave, and should containing other compositions such as DC component.Inventor finds in the research and practice process of prior art: inverter is due to reasons such as BUS Voltage unbalance, inaccurate, the circuit parameter deviations of sampling, and the existence of DC component is inevitable.Suppress if do not taken effective measures, the DC component in output voltage then likely can bring harm to powered load, and such as inductive load as transformer " magnetic saturation " etc., thus makes load cisco unity malfunction.Therefore the DC component how eliminated in output voltage becomes problem demanding prompt solution.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technological deficiency, particularly solves the defect cannot eliminating DC component in output voltage in prior art.
For achieving the above object, one aspect of the present invention proposes a kind of direct current component control method for three-phase inverter, comprises the following steps: detect the output voltage of described three-phase inverter and the DC component of described output voltage; The conversion of static coordinate to rotational coordinates is carried out to obtain the component of described DC component on described rotational coordinates to the DC component of described output voltage; Direct voltage adjusted value is calculated according to the component of described DC component on described rotational coordinates and direct voltage set-point; The voltage given value of described three-phase inverter is calculated according to the reference output voltage of described direct voltage adjusted value and described three-phase inverter; The output adjustment voltage of described three-phase inverter is calculated according to the output voltage of described voltage given value and described three-phase inverter; Described rotational coordinates to the conversion of described static coordinate is carried out to the output of described three-phase inverter adjustment voltage and goes forward side by side horizontal pulse width modulated PWM to obtain the drive singal of described three-phase inverter; With the drive singal according to described three-phase inverter, drived control is carried out to described three-phase inverter.
The present invention also proposed a kind of DC component control system for three-phase inverter on the other hand, comprising: three-phase inverter, detection module, for the DC component of the output voltage and described output voltage that detect described three-phase inverter, controller, for carrying out the conversion of static coordinate to rotational coordinates to the DC component of described output voltage to obtain the component of described DC component on described rotational coordinates, and calculate direct voltage adjusted value according to the component of described DC component on described rotational coordinates and direct voltage set-point, and the voltage given value of described three-phase inverter is calculated according to the reference output voltage of described direct voltage adjusted value and described three-phase inverter, with the output adjustment voltage calculating described three-phase inverter according to the output voltage of described voltage given value and described three-phase inverter, and described rotational coordinates to the conversion of described static coordinate is carried out to the output of described three-phase inverter adjustment voltage go forward side by side horizontal pulse width modulated PWM to obtain the drive singal of described three-phase inverter, and driver module, the drive singal for the three-phase inverter obtained according to described controller carries out drived control to described three-phase inverter.
Further aspect of the present invention also proposed a kind of direct current component control method for single-phase inverter, comprise the following steps: according to the structure of the structure structure three-phase inverter of described single-phase inverter, and using described single-phase inverter as the first-phase in described three-phase inverter; Detect the output voltage of described single-phase inverter and the DC component of described output voltage, and it can be used as the first DC component of the first output voltage of described first-phase and described first output voltage; The second output voltage of second-phase in described three-phase inverter is calculated according to the structure of the three-phase inverter of described structure and the first output voltage of described first-phase, and the 3rd output voltage of third phase, and the 3rd DC component of the second DC component of described second output voltage and the 3rd output voltage is set to zero; The conversion of static coordinate to rotational coordinates is carried out to obtain described first DC component, the second DC component and the component of the 3rd DC component on described rotational coordinates to described first DC component, the second DC component and the 3rd DC component; The first direct voltage adjusted value of described first-phase is calculated, the second direct voltage adjusted value of described second-phase and the 3rd direct voltage adjusted value of described third phase according to component on described rotational coordinates of described first DC component, the second DC component and the 3rd DC component and the first direct voltage set-point of described first-phase, the second direct voltage set-point of described second-phase and the 3rd direct voltage set-point of described third phase; According to described first direct voltage adjusted value, the second direct voltage adjusted value and the 3rd direct voltage adjusted value, and the first reference output voltage of described three-phase inverter, the second reference output voltage and the 3rd reference output voltage calculate the first voltage given value of described first-phase, the second voltage given value of described second-phase and the tertiary voltage set-point of described third phase respectively; According to described first voltage given value, the second voltage given value and tertiary voltage set-point, and described first output voltage, the second output voltage and the 3rd output voltage calculate, and first of described first-phase exports adjustment voltage, the second output of described second-phase adjusts voltage and the 3rd output adjustment voltage of described third phase; To described first export adjustment voltage, second export adjustment voltage and the 3rd export adjustment voltage carry out described rotational coordinates to described static coordinate conversion and carry out PWM to obtain the 3rd drive singal of the first drive singal of described first-phase, the second drive singal of described second-phase and described third phase; With according to described first drive singal, drived control is carried out to described single-phase inverter.
Further aspect of the present invention also proposed a kind of DC component control system for single-phase inverter, comprising: single-phase inverter, detection module, for the DC component of the output voltage and described output voltage that detect described single-phase inverter, controller, is configured to perform following functions: for preserving the structure of the three-phase inverter constructed according to the structure of described single-phase inverter, wherein, described single-phase inverter is the first-phase in described three-phase inverter, for the output voltage of described single-phase inverter that described detection module is detected and first output voltage of the DC component of output voltage as described first-phase and the first DC component of described first output voltage, and the second output voltage of second-phase in described three-phase inverter is calculated according to the structure of the three-phase inverter of described structure and the first output voltage of described first-phase, and the 3rd output voltage of third phase, and the 3rd DC component of the second DC component of described second output voltage and the 3rd output voltage is set to zero, for to described first DC component, second DC component and the 3rd DC component carry out the conversion of static coordinate to rotational coordinates to obtain described first DC component, second DC component and the component of the 3rd DC component on described rotational coordinates, and according to described first DC component, second DC component and the 3rd DC component component on described rotational coordinates and the first direct voltage set-point of described first-phase, second direct voltage set-point of described second-phase and the 3rd direct voltage set-point of described third phase calculate the first direct voltage adjusted value of described first-phase, second direct voltage adjusted value of described second-phase and the 3rd direct voltage adjusted value of described third phase, for according to described first direct voltage adjusted value, the second direct voltage adjusted value and the 3rd direct voltage adjusted value, and the first reference output voltage of described three-phase inverter, the second reference output voltage and the 3rd reference output voltage calculate the first voltage given value of described first-phase, the second voltage given value of described second-phase and the tertiary voltage set-point of described third phase respectively, for according to described first voltage given value, the second voltage given value and tertiary voltage set-point, and described first output voltage, the second output voltage and the 3rd output voltage calculate first of described first-phase and export adjustment voltage, second the exporting the 3rd of adjustment voltage and described third phase and export adjustment voltage of described second-phase, for to described first export adjustment voltage, second export adjustment voltage and the 3rd export adjustment voltage carry out described rotational coordinates to described static coordinate conversion and carry out PWM to obtain the 3rd drive singal of the first drive singal of described first-phase, the second drive singal of described second-phase and described third phase, and driver module, for carrying out drived control according to described first drive singal to described single-phase inverter.
The DC component of the present invention in the mode control inverter output voltage passing through Frequency conversion control, thus effectively can reduce the DC component in inverter output voltage, to adapt to load needs.And DC component vector control of the present invention can be combined with current Frequency conversion control mode, therefore simple and reliable, without the need to increasing cost.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the control method schematic diagram of inverter in prior art;
Fig. 2 is the direct current component control method flow chart for three-phase inverter of the embodiment of the present invention one;
Fig. 3 is the low pass filter schematic diagram of the second order of the embodiment of the present invention;
Fig. 4 is the DC component Control system architecture figure for three-phase inverter of the embodiment of the present invention one;
Fig. 5 is the controller architecture figure of the embodiment of the present invention one;
Fig. 6 is the direct current component control method flow chart for single-phase inverter of the embodiment of the present invention two;
Fig. 7 is the topological circuit structure of the half-bridge three-phase inverter that the embodiment of the present invention two constructs;
Fig. 8 is the DC component Control system architecture figure for single-phase inverter of the embodiment of the present invention two;
Fig. 9 is the controller architecture figure of the embodiment of the present invention two.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
DC component vector control method of the present invention can combine with existing vector control mode, clearly understands, simply introduce below to existing vector control mode to have the present invention.Space vector technique has the advantages such as the precision of voltage regulation is high, dynamic response performance is good, and it by the electricity relation of self, can convert in d/q/0 rotating coordinate system.Therefore the electric current and voltage of himself is no longer the simple alternating current amount in reality, but the DC component under rotating coordinate system.Controller generally adopts the double-loop control structure of current inner loop outer voltage, and the DC component in the rotating coordinate system that voltage and current wherein obtains after being all employing conversion, its structure as shown in Figure 1.But only can comprise Voltage loop in some other mode, and not comprise electric current loop.The present invention all can combine with these two kinds of modes.Output voltage Ua, Ub, Uc and inductive current Ia, Ib, Ic, through the conversion of d/q/0 rotating coordinate system, obtain voltage, the d axle of electric current, q axle, 0 axle component, and using them as the control object of Voltage loop and electric current loop.
In addition, direct current component control method of the present invention not only can be applied among three-phase inverter in an embodiment of the present invention, also can be applicable in single-phase inverter.If applied in single-phase inverter, then need the three-phase inverter according to single-phase inverter constructing virtual, these are described in detail among follow-up embodiment.
Embodiment one,
As shown in Figure 2, be the direct current component control method flow chart for three-phase inverter of the embodiment of the present invention one, comprise the following steps:
Step S201, detects the output voltage of three-phase inverter and the DC component of output voltage.If the output voltage of the three-phase inverter detected is Ua, Ub, Uc, output voltage is that Ua, Ub, Uc obtain DC component Uade, Ubde, Ucdc of three-phase inverter output voltage through DC component detection circuit.In one embodiment of the invention, the low pass filter being about the second order of 1Hz by cut-off frequency detects the DC component of described three-phase inverter output voltage.As shown in Figure 3, be the low pass filter schematic diagram of the second order of the embodiment of the present invention.
Step S202, carries out the conversion of a/b/c static coordinate to d/q/0 rotational coordinates to obtain DC component component Udde, Uqdc, U0de on described rotational coordinates to the DC component Uadc of output voltage, Ubdc, Ucdc.Particularly, voltage DC component Uadc, Ubdc, Uedc after obtaining filtering are carried out the conversion of d/q/0 rotating coordinate system.Dq0 transformation matrix is as follows:
Step S203, calculates direct voltage adjusted value according to DC component component Udde, Uqdc, U0dc on d/q/0 rotational coordinates and direct voltage set-point.In one embodiment of the invention, this direct voltage set-point is zero.
Step S204, calculates the voltage given value of three-phase inverter according to the reference output voltage of direct voltage adjusted value and three-phase inverter.This step is calculated by DC component controller, and this DC component controller can be proportional integral (PI) controller, also can be other controllers such as PID controller.
Step S205, calculates the output adjustment voltage of three-phase inverter according to the output voltage of voltage given value and three-phase inverter.This step is identical with existing space vector control, does not therefore repeat them here.As mentioned above, only can comprise Voltage loop in this step, also can comprise the combination of Voltage loop and electric current loop.
Such as, corresponding d axle component, using described sampling direct voltage d axle component as the feedback quantity of d axle direct current voltage regulator, subtracts each other with described d axle direct voltage set-point (being set to 0), carries out DC component controller and regulates computing.The output of DC component controller is added with inverter d shaft voltage reference value, calculates through d axle circuit control device, obtains d axle component control signal (namely exporting adjustment voltage).Corresponding q axle component, using described sampling direct voltage q axle component as the feedback quantity of q axle direct current voltage regulator, subtracts each other with described q axle direct voltage set-point (being set to 0), carries out DC component controller and regulates computing.DC component controller exports and is added with inverter q shaft voltage reference value, calculates, obtain q axle component control signal through q axle circuit control device.Corresponding 0 axle component, using the feedback quantity of described sampling direct voltage 0 axle component as 0 axle direct current voltage regulator, subtracts each other with described 0 axle direct voltage set-point (being set to 0), carries out DC component controller and regulates computing.DC component controller exports and is added with inverter 0 shaft voltage reference value, calculates, obtain 0 axle component control signal through 0 axle circuit control device.
Step S206, carries out d/q/0 rotational coordinates to the conversion of a/b/c static coordinate to the output of three-phase inverter adjustment voltage and carries out PWM to obtain the drive singal of three-phase inverter.
Step S207, the drive singal according to three-phase inverter carries out drived control to eliminate the DC component in output voltage to described three-phase inverter.
As shown in Figure 4, be the DC component Control system architecture figure for three-phase inverter of the embodiment of the present invention one.This system comprises three-phase inverter 100, detection module 200, controller 300 and driver module 400.Detection module 200 is for the DC component of the output voltage and described output voltage that detect three-phase inverter 100.Controller 300 is for carrying out the conversion of static coordinate to rotational coordinates to obtain the component of DC component on rotational coordinates to the DC component of output voltage, and calculate direct voltage adjusted value according to the component of DC component on rotational coordinates and direct voltage set-point, and the voltage given value of three-phase inverter is calculated according to the reference output voltage of direct voltage adjusted value and three-phase inverter, with the output adjustment voltage calculating three-phase inverter according to the output voltage of voltage given value and three-phase inverter 100 Voltage loop, and rotational coordinates is carried out to the conversion of static coordinate to the output of three-phase inverter 100 adjustment voltage carry out PWM to obtain the drive singal of three-phase inverter 100.Driver module 400 carries out drived control to eliminate the DC component in output voltage for the drive singal of the three-phase inverter 100 obtained according to controller 300 to three-phase inverter 100.
In one embodiment of the invention, above-mentioned direct voltage set-point is zero.
In one embodiment of the invention, detection module 200 is the low pass filter of the second order of 1Hz for cut-off frequency.
As shown in Figure 5, be the controller architecture figure of the embodiment of the present invention one.This controller 300 comprises the first modular converter 310, DC controller 320, inverter controller 330, second modular converter 340 and PWM module 350.First modular converter 310 is for carrying out the conversion of static coordinate to rotational coordinates to obtain the component of DC component on rotational coordinates to the DC component of output voltage.DC controller 320 for calculating direct voltage adjusted value according to the component of DC component on rotational coordinates and direct voltage set-point, and calculates the voltage given value of described three-phase inverter according to the reference output voltage of direct voltage adjustment and described three-phase inverter.Inverter controller 330 is for calculating the output adjustment voltage of described three-phase inverter according to the output voltage of voltage given value and three-phase inverter.Second modular converter 340 is for carrying out the conversion of rotational coordinates to static coordinate to the output adjustment voltage of three-phase inverter.PWM module 350 is for carrying out PWM to obtain the drive singal of described three-phase inverter to the output adjustment voltage after conversion.
Embodiment two,
As shown in Figure 6, be the direct current component control method flow chart for single-phase inverter of the embodiment of the present invention two, comprise the following steps:
Step S601, according to the structure of the structure structure three-phase inverter of single-phase inverter, and using single-phase inverter as the first-phase in described three-phase inverter.It should be noted that, can, using single-phase inverter as the arbitrary phase in three-phase inverter, both can be A phase in embodiments of the present invention, also can be B phase or C phase, therefore above-mentioned first-phase can be A phase, B phase or C phase.In an embodiment of the present invention so that single-phase inverter is described as A phase.Because single-phase inverter is compared with three-phase inverter, lack required complete three phase mains signal and topological structure, therefore need the topological structure of virtual construct B, C two-phase and corresponding transfer function, thus meet the requirement of vector control to three phase mains.As a kind of case study on implementation of the present invention, as shown in Figure 7, be the topological circuit structure of the half-bridge three-phase inverter of the embodiment of the present invention two structure.Wherein, in this embodiment, B phase and the circuit of C phase are that its structure of virtual circuit is identical with A circuitry phase.Wherein, E1, E2 are positive and negative DC B US voltage, and Q1, Q2 are the driving transistors (IGBT) of actual single-phase inverter, and inductance L 1, electric capacity C1 are actual filter circuit, and RI is its load.Wherein, Q3 ~ Q6 is the driving transistors of virtual two-phase, and L2, L3 are virtual inductor, and C2, C3 are simulated capacitance, and R2, R3 are dummy load.Wherein, above-mentioned inductance value is identical is set to L, and capacitance is identical is set to C, and load is identical is set to R.
Step S602, detects the output voltage of single-phase inverter and the DC component of described output voltage, and it can be used as the first output voltage of the first-phase of the three-phase inverter of structure and the first DC component of the first output voltage.In one embodiment of the invention, the low pass filter being about the second order of 1Hz by cut-off frequency detects the DC component of described three-phase inverter output voltage.
Step S603, calculate the second output voltage of second-phase in described three-phase inverter and the 3rd output voltage of third phase according to the structure of three-phase inverter constructed and the first output voltage of described first-phase, and the 3rd DC component of the second DC component of the second output voltage and the 3rd output voltage is set to zero.
Step S604, carries out the conversion of static coordinate to rotational coordinates to obtain the first DC component, the second DC component and the component of the 3rd DC component on rotational coordinates to the first DC component, the second DC component and the 3rd DC component.
Step S605, the first direct voltage adjusted value, the second direct voltage adjusted value of second-phase and the 3rd direct voltage adjusted value of third phase of first-phase is calculated according to the 3rd direct voltage set-point of component on rotational coordinates of the first DC component, the second DC component and the 3rd DC component and the first direct voltage set-point of first-phase, the second direct voltage set-point of second-phase and third phase.In one embodiment of the invention, the first direct voltage set-point, the second direct voltage set-point and the 3rd direct voltage set-point are zero.
Step S606, according to the first direct voltage adjusted value, the second direct voltage adjusted value and the 3rd direct voltage adjusted value, and the first reference output voltage of three-phase inverter, the second reference output voltage and the 3rd reference output voltage calculate the tertiary voltage set-point of the first voltage given value of first-phase, the second voltage given value of second-phase and third phase respectively.In one embodiment of the invention, the first reference output voltage is the given voltage magnitude Vmax of single-phase inverter Voltage loop, and the second reference output voltage and the 3rd reference output voltage are zero.
Step S607, according to the first voltage given value, the second voltage given value and tertiary voltage set-point, and first of the first output voltage, the second output voltage and the 3rd output voltage calculating first-phase exports adjustment voltage, the second output adjustment voltage of second-phase and the 3rd output adjustment voltage of third phase.
Step S608, to first export adjustment voltage, second export adjustment voltage and the 3rd export adjustment voltage carry out rotational coordinates to described static coordinate conversion and carry out PWM to obtain the 3rd drive singal of the first drive singal of described first-phase, the second drive singal of described second-phase and described third phase.
Step S609, carries out drived control according to described first drive singal to described single-phase inverter.
In a preferred embodiment of the invention, because B phase is virtual with C phase, therefore also need to calculate the output voltage of second-phase and the output voltage of third phase according to the second drive singal and the 3rd drive singal, and calculate the output voltage of second-phase and third phase according to the output voltage of second-phase and the output voltage of third phase, thus ensure the stable operation of simulation three-phase inverter.
As shown in Figure 8, be the DC component Control system architecture figure for single-phase inverter of the embodiment of the present invention two.This system comprises single-phase inverter 500, detection module 600, controller 700 and driver module 800.Detection module 600 is for the DC component of the output voltage and described output voltage that detect single-phase inverter 500.Controller 700 is for preserving the structure of the three-phase inverter constructed according to the structure of described single-phase inverter, and wherein, described single-phase inverter is the first-phase in described three-phase inverter.Controller 700 is also for the output voltage of single-phase inverter 500 that detected by detection module 600 and first output voltage of the DC component of output voltage as first-phase and the first DC component of described first output voltage, and the second output voltage of second-phase in described three-phase inverter is calculated according to the structure of the three-phase inverter of described structure and the first output voltage of described first-phase, and the 3rd output voltage of third phase, and the 3rd DC component of the second DC component of described second output voltage and the 3rd output voltage is set to zero.Controller 700 is also for the first DC component, second DC component and the 3rd DC component carry out the conversion of static coordinate to rotational coordinates to obtain the first DC component, second DC component and the component of the 3rd DC component on described rotational coordinates, and according to described first DC component, second DC component and the 3rd DC component component on described rotational coordinates and the first direct voltage set-point of described first-phase, second direct voltage set-point of described second-phase and the 3rd direct voltage set-point of described third phase calculate the first direct voltage adjusted value of described first-phase, second direct voltage adjusted value of described second-phase and the 3rd direct voltage adjusted value of described third phase.Controller 700 is also for according to the first direct voltage adjusted value, the second direct voltage adjusted value and the 3rd direct voltage adjusted value, and the first reference output voltage of described three-phase inverter, the second reference output voltage and the 3rd reference output voltage calculate the tertiary voltage set-point of the first voltage given value of first-phase, the second voltage given value of second-phase and third phase respectively.Controller 700 is also for according to the first voltage given value, the second voltage given value and tertiary voltage set-point, and the first output voltage, the second output voltage and the 3rd output voltage calculate first of first-phase and export adjustment voltage, second the exporting the 3rd of adjustment voltage and described third phase and export adjustment voltage of described second-phase.Controller 700 also for first export adjustment voltage, second export adjustment voltage and the 3rd export adjustment voltage carry out described rotational coordinates to described static coordinate conversion and carry out PWM to obtain the 3rd drive singal of the first drive singal of described first-phase, the second drive singal of described second-phase and described third phase.Driver module 800 is for carrying out drived control according to the first drive singal to single-phase inverter 500.In one embodiment of the invention, the first direct voltage set-point, the second direct voltage set-point and the 3rd direct voltage set-point are zero.
In one embodiment of the invention, controller 700 is also for calculating the output voltage of described second-phase and the output voltage of described third phase according to the second drive singal and the 3rd drive singal.
In one embodiment of the invention, detection module 600 is the low pass filter of the second order of 1Hz for cut-off frequency.
As shown in Figure 9, be the controller architecture figure of the embodiment of the present invention two.This controller 700 comprises output computing module 710, first modular converter 720, DC controller 730, inverter controller 740, second modular converter 750 and PWM module 760.Export computing module 710 for the output voltage of single-phase inverter that detected by detection module 600 and first output voltage of the DC component of output voltage as first-phase and the first DC component of the first output voltage, and the second output voltage of second-phase in described three-phase inverter is calculated according to the structure of the three-phase inverter of described structure and the first output voltage of described first-phase, and the 3rd output voltage of third phase, and the 3rd DC component of the second DC component of described second output voltage and the 3rd output voltage is set to zero.First modular converter 720 is for carrying out the conversion of static coordinate to rotational coordinates to obtain described first DC component, the second DC component and the component of the 3rd DC component on described rotational coordinates to the first DC component, the second DC component and the 3rd DC component.DC controller 730 is for according to the first DC component, second DC component and the 3rd DC component component on described rotational coordinates and the first direct voltage set-point of described first-phase, second direct voltage set-point of described second-phase and the 3rd direct voltage set-point of described third phase calculate the first direct voltage adjusted value of described first-phase, second direct voltage adjusted value of described second-phase and the 3rd direct voltage adjusted value of described third phase, and according to described first direct voltage adjusted value, second direct voltage adjusted value and the 3rd direct voltage adjusted value, and the first reference output voltage of described three-phase inverter, second reference output voltage and the 3rd reference output voltage calculate the first voltage given value of described first-phase respectively, second voltage given value of second-phase and the tertiary voltage set-point of described third phase.Inverter controller 740 is for according to the first voltage given value, the second voltage given value and tertiary voltage set-point, and described first output voltage, the second output voltage and the 3rd output voltage calculate first of described first-phase and export adjustment voltage, second the exporting the 3rd of adjustment voltage and third phase and export adjustment voltage of described second-phase.Second modular converter 750 carries out the conversion of rotational coordinates to static coordinate for exporting adjustment voltage, the second output adjustment voltage and the 3rd output adjustment voltage to first.PWM module 760 adjusts voltage for exporting first after conversion, the second output adjustment voltage and the 3rd exports adjustment voltage and carries out PWM to obtain the 3rd drive singal of the first drive singal of described first-phase, the second drive singal of described second-phase and described third phase.
The DC component of the present invention in the mode control inverter output voltage passing through Frequency conversion control, thus effectively can reduce the DC component in inverter output voltage, to adapt to load needs.And DC component vector control of the present invention can be combined with current Frequency conversion control mode, therefore simple and reliable, without the need to increasing cost.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (12)
1. for a direct current component control method for three-phase inverter, it is characterized in that, comprise the following steps:
Detect the output voltage of described three-phase inverter and the DC component of described output voltage;
The conversion of static coordinate to rotational coordinates is carried out to obtain the component of described DC component on described rotational coordinates to the DC component of described output voltage;
Calculate direct voltage adjusted value according to the component of described DC component on described rotational coordinates and direct voltage set-point, wherein, described direct voltage set-point is zero;
The voltage given value of described three-phase inverter is calculated according to the reference output voltage of described direct voltage adjusted value and described three-phase inverter;
The output adjustment voltage of described three-phase inverter is calculated according to the output voltage of described voltage given value and described three-phase inverter;
Described rotational coordinates to the conversion of described static coordinate is carried out to the output of described three-phase inverter adjustment voltage and goes forward side by side horizontal pulse width modulated PWM to obtain the drive singal of described three-phase inverter; With
Drive singal according to described three-phase inverter carries out drived control to described three-phase inverter.
2., as claimed in claim 1 for the direct current component control method of three-phase inverter, it is characterized in that, detected the DC component of described three-phase inverter output voltage by low pass filter.
3., for a DC component control system for three-phase inverter, it is characterized in that, comprising:
Three-phase inverter;
Detection module, for the DC component of the output voltage and described output voltage that detect described three-phase inverter;
Controller, for carrying out the conversion of static coordinate to rotational coordinates to the DC component of described output voltage to obtain the component of described DC component on described rotational coordinates, and calculate direct voltage adjusted value according to the component of described DC component on described rotational coordinates and direct voltage set-point, wherein, described direct voltage set-point is zero, and the voltage given value of described three-phase inverter is calculated according to the reference output voltage of described direct voltage adjusted value and described three-phase inverter, with the output adjustment voltage calculating described three-phase inverter according to the output voltage of described voltage given value and described three-phase inverter, and described rotational coordinates to the conversion of described static coordinate is carried out to the output of described three-phase inverter adjustment voltage go forward side by side horizontal pulse width modulated PWM to obtain the drive singal of described three-phase inverter, with
Driver module, the drive singal for the three-phase inverter obtained according to described controller carries out drived control to described three-phase inverter.
4., as claimed in claim 3 for the DC component control system of three-phase inverter, it is characterized in that, described detection module is low pass filter.
5., as claimed in claim 3 for the DC component control system of three-phase inverter, it is characterized in that, described controller comprises:
First modular converter, for carrying out the conversion of static coordinate to rotational coordinates to obtain the component of described DC component on described rotational coordinates to the DC component of described output voltage;
DC controller, for calculating direct voltage adjusted value according to the component of described DC component on described rotational coordinates and direct voltage set-point, and calculate the voltage given value of described three-phase inverter according to the reference output voltage of described direct voltage adjustment and described three-phase inverter;
Inverter controller, for calculating the output adjustment voltage of described three-phase inverter according to the output voltage of described voltage given value and described three-phase inverter;
Second modular converter, for carrying out the conversion of described rotational coordinates to described static coordinate to the output adjustment voltage of described three-phase inverter;
Pulse width modulation (PWM) modulation module, for carrying out PWM to obtain the drive singal of described three-phase inverter to the output adjustment voltage after conversion.
6. for a direct current component control method for single-phase inverter, it is characterized in that, comprise the following steps:
According to the structure of the structure structure three-phase inverter of described single-phase inverter, and using described single-phase inverter as the first-phase in described three-phase inverter;
Detect the output voltage of described single-phase inverter and the DC component of described output voltage, and it can be used as the first DC component of the first output voltage of described first-phase and described first output voltage;
The second output voltage of second-phase in described three-phase inverter is calculated according to the structure of the three-phase inverter of described structure and the first output voltage of described first-phase, and the 3rd output voltage of third phase, and the 3rd DC component of the second DC component of described second output voltage and the 3rd output voltage is set to zero;
The conversion of static coordinate to rotational coordinates is carried out to obtain described first DC component, the second DC component and the component of the 3rd DC component on described rotational coordinates to described first DC component, the second DC component and the 3rd DC component;
According to described first DC component, second DC component and the 3rd DC component component on described rotational coordinates and the first direct voltage set-point of described first-phase, second direct voltage set-point of described second-phase and the 3rd direct voltage set-point of described third phase calculate the first direct voltage adjusted value of described first-phase, second direct voltage adjusted value of described second-phase and the 3rd direct voltage adjusted value of described third phase, wherein, described first direct voltage set-point, described second direct voltage set-point and described 3rd direct voltage set-point are zero,
According to described first direct voltage adjusted value, the second direct voltage adjusted value and the 3rd direct voltage adjusted value, and the first reference output voltage of described three-phase inverter, the second reference output voltage and the 3rd reference output voltage calculate the first voltage given value of described first-phase, the second voltage given value of described second-phase and the tertiary voltage set-point of described third phase respectively;
According to described first voltage given value, the second voltage given value and tertiary voltage set-point, and described first output voltage, the second output voltage and the 3rd output voltage calculate, and first of described first-phase exports adjustment voltage, the second output of described second-phase adjusts voltage and the 3rd output adjustment voltage of described third phase;
To described first export adjustment voltage, second export adjustment voltage and the 3rd export adjustment voltage carry out described rotational coordinates to described static coordinate conversion and carry out PWM to obtain the 3rd drive singal of the first drive singal of described first-phase, the second drive singal of described second-phase and described third phase; With
According to described first drive singal, drived control is carried out to described single-phase inverter.
7., as claimed in claim 6 for the direct current component control method of single-phase inverter, it is characterized in that, also comprise:
The output voltage of described second-phase and the output voltage of described third phase is calculated according to described second drive singal and the 3rd drive singal.
8., as claimed in claim 6 for the direct current component control method of single-phase inverter, it is characterized in that, detected the DC component of described three-phase inverter output voltage by low pass filter.
9., for a DC component control system for single-phase inverter, it is characterized in that, comprising:
Single-phase inverter;
Detection module, for the DC component of the output voltage and described output voltage that detect described single-phase inverter;
Controller, is configured to perform following functions:
For preserving the structure of the three-phase inverter constructed according to the structure of described single-phase inverter, wherein, described single-phase inverter is the first-phase in described three-phase inverter;
For the output voltage of described single-phase inverter that described detection module is detected and first output voltage of the DC component of output voltage as described first-phase and the first DC component of described first output voltage, and the second output voltage of second-phase in described three-phase inverter is calculated according to the structure of the three-phase inverter of described structure and the first output voltage of described first-phase, and the 3rd output voltage of third phase, and the 3rd DC component of the second DC component of described second output voltage and the 3rd output voltage is set to zero;
For to described first DC component, second DC component and the 3rd DC component carry out the conversion of static coordinate to rotational coordinates to obtain described first DC component, second DC component and the component of the 3rd DC component on described rotational coordinates, and according to described first DC component, second DC component and the 3rd DC component component on described rotational coordinates and the first direct voltage set-point of described first-phase, second direct voltage set-point of described second-phase and the 3rd direct voltage set-point of described third phase calculate the first direct voltage adjusted value of described first-phase, second direct voltage adjusted value of described second-phase and the 3rd direct voltage adjusted value of described third phase, wherein, described first direct voltage set-point, described second direct voltage set-point and described 3rd direct voltage set-point are zero,
For according to described first direct voltage adjusted value, the second direct voltage adjusted value and the 3rd direct voltage adjusted value, and the first reference output voltage of described three-phase inverter, the second reference output voltage and the 3rd reference output voltage calculate the first voltage given value of described first-phase, the second voltage given value of described second-phase and the tertiary voltage set-point of described third phase respectively;
For according to described first voltage given value, the second voltage given value and tertiary voltage set-point, and described first output voltage, the second output voltage and the 3rd output voltage calculate first of described first-phase and export adjustment voltage, second the exporting the 3rd of adjustment voltage and described third phase and export adjustment voltage of described second-phase;
For to described first export adjustment voltage, second export adjustment voltage and the 3rd export adjustment voltage carry out described rotational coordinates to described static coordinate conversion and carry out PWM to obtain the 3rd drive singal of the first drive singal of described first-phase, the second drive singal of described second-phase and described third phase; With
Driver module, for carrying out drived control according to described first drive singal to described single-phase inverter.
10. as claimed in claim 9 for the DC component control system of single-phase inverter, it is characterized in that, described controller is also for calculating the output voltage of described second-phase and the output voltage of described third phase according to described second drive singal and the 3rd drive singal.
11. as claimed in claim 9 for the DC component control system of single-phase inverter, and it is characterized in that, described detection module is low pass filter.
12. as claimed in claim 9 for the DC component control system of single-phase inverter, and it is characterized in that, described controller comprises:
Export computing module, for the output voltage of described single-phase inverter that described detection module is detected and first output voltage of the DC component of output voltage as described first-phase and the first DC component of described first output voltage, and the second output voltage of second-phase in described three-phase inverter is calculated according to the structure of the three-phase inverter of described structure and the first output voltage of described first-phase, and the 3rd output voltage of third phase, and the 3rd DC component of the second DC component of described second output voltage and the 3rd output voltage is set to zero;
First modular converter, for carrying out the conversion of static coordinate to rotational coordinates to obtain described first DC component, the second DC component and the component of the 3rd DC component on described rotational coordinates to described first DC component, the second DC component and the 3rd DC component;
DC controller, for according to described first DC component, second DC component and the 3rd DC component component on described rotational coordinates and the first direct voltage set-point of described first-phase, second direct voltage set-point of described second-phase and the 3rd direct voltage set-point of described third phase calculate the first direct voltage adjusted value of described first-phase, second direct voltage adjusted value of described second-phase and the 3rd direct voltage adjusted value of described third phase, and according to described first direct voltage adjusted value, second direct voltage adjusted value and the 3rd direct voltage adjusted value, and the first reference output voltage of described three-phase inverter, second reference output voltage and the 3rd reference output voltage calculate the first voltage given value of described first-phase respectively, second voltage given value of described second-phase and the tertiary voltage set-point of described third phase,
Inverter controller, for according to described first voltage given value, the second voltage given value and tertiary voltage set-point, and described first output voltage, the second output voltage and the 3rd output voltage calculate first of described first-phase and export adjustment voltage, second the exporting the 3rd of adjustment voltage and described third phase and export adjustment voltage of described second-phase;
Second modular converter, carries out the conversion of described rotational coordinates to described static coordinate for exporting adjustment voltage, the second output adjustment voltage and the 3rd output adjustment voltage to described first; With
PWM module, for conversion after first export adjustment voltage, second export adjustment voltage and the 3rd export adjustment voltage carry out PWM to obtain the 3rd drive singal of the first drive singal of described first-phase, the second drive singal of described second-phase and described third phase.
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| CN112366970B (en) * | 2021-01-14 | 2021-04-02 | 深圳市正浩创新科技有限公司 | Inversion system, inversion system control method and parallel inversion system |
| CN112448573B (en) * | 2021-02-01 | 2021-05-28 | 深圳英飞源技术有限公司 | Control method for magnetic balance of magnetic component in inverter circuit |
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| CN1385956A (en) * | 2002-02-07 | 2002-12-18 | 艾默生网络能源有限公司 | Inverter and output voltage control method |
| CN101572417A (en) * | 2009-06-03 | 2009-11-04 | 东南大学 | Maximum power tracking control method for monopole three-phase photovoltaic grid-connected system |
| CN101719679A (en) * | 2009-12-21 | 2010-06-02 | 中国电力科学研究院 | Method for synchronizing distributed power supply and power grid |
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| CN1385956A (en) * | 2002-02-07 | 2002-12-18 | 艾默生网络能源有限公司 | Inverter and output voltage control method |
| CN101572417A (en) * | 2009-06-03 | 2009-11-04 | 东南大学 | Maximum power tracking control method for monopole three-phase photovoltaic grid-connected system |
| CN101719679A (en) * | 2009-12-21 | 2010-06-02 | 中国电力科学研究院 | Method for synchronizing distributed power supply and power grid |
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