CN115800721A - Method for eliminating grid-connected current harmonic distortion by three-phase grid-connected conversion circuit - Google Patents
Method for eliminating grid-connected current harmonic distortion by three-phase grid-connected conversion circuit Download PDFInfo
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Abstract
The invention provides a method for eliminating grid-connected current harmonic distortion by a three-phase grid-connected conversion circuit, which comprises the following steps: the voltage of the direct current bus is adjusted by adopting a voltage loop feedback controller, and a low-pass filter is added behind a voltage loop controller in series for filtering ripple components of 6 times of power frequency and higher frequency in an output value of the voltage loop controller, so that current harmonic distortion caused by power inversion is effectively inhibited; a current loop feedback controller is adopted to regulate grid-connected current, and a selective harmonic repetitive controller is added in the current loop feedback controller in parallel for accurately and quickly tracking a reference signal and thoroughly eliminating 6k +/-1 harmonic components in the grid-connected current, so that current harmonic distortion caused by grid voltage distortion and load disturbance is effectively inhibited. The invention can comprehensively and efficiently eliminate the grid-connected current harmonic distortion of the three-phase grid-connected converter caused by various factors.
Description
Technical Field
The invention belongs to the technical field of three-phase grid-connected conversion circuit control, and particularly relates to a method for eliminating grid-connected current harmonic distortion by a three-phase grid-connected conversion circuit.
Background
With the rapid development of power electronic technology, more and more power generation devices and power loads adopt power electronic converters as interfaces to be connected into a power grid, so that the harmonic pollution of the power grid is increasingly serious. For example, when the electrical load adopts a three-phase diode or thyristor bridge rectifier circuit as a grid-connected interface, a large amount of 6k +/-1 harmonic current and reactive power are generated to seriously pollute the power grid, so that the electrical load becomes an electric power public hazard. Power electronics have become one of the most dominant harmonic sources of the power grid. China issued the standard of 'electric energy quality public power grid harmonic wave' (GB/T14549-93) in 1993, revised the harmonic wave standard IEC555-2 in 1988, and established the IEC61000-3-2 standard, and the requirements of the A-type standard are shown in Table 1.
TABLE 1
Harmonic current and reactive current of the power system can not only increase electric energy loss of lines and equipment to reduce power transmission and distribution efficiency of a power grid, but also cause a series of problems of electromechanical vibration, equipment overheating insulation aging, device misoperation, electromagnetic interference and the like to reduce power supply quality of the power grid.
Compared with a three-phase diode or thyristor rectification circuit, the three-phase Power Factor Correction (PFC) circuit or the PWM rectifier and the like are used as a power generation device or a grid-connected interface of an electric load, so that current harmonic pollution can be effectively reduced. The three-phase grid-connected conversion circuit comprises a three-phase PFC circuit, a three-phase PWM rectifier and the like, and is very common and widely applied in practical application. The two main functions of the three-phase grid-connected conversion circuit comprise: (1) The alternating current measurement grid-connected current and the power grid voltage are synchronous and sinusoidal; (2) So that the dc-side bus voltage stably tracks the given reference value. The conventional control scheme of the three-phase grid-connected conversion circuit generally adopts a double-loop structure: the direct-current voltage control outer ring is a multi-purpose PI controller and is used for realizing the stable work of the direct-current bus voltage at a set value; the inner ring of the alternating current grid-connected current control mostly adopts a PID controller, a state feedback controller and the like, and is used for realizing accurate tracking of the grid-connected current on the reference current. For a three-phase grid-connected converter, the AC/DC power conversion can cause the DC bus voltage of the converter to generate 6 times of power grid power frequency ripple, the voltage ripple can cause the output control quantity of a DC voltage outer loop controller to contain 6 times of power grid power frequency component, and then 6k +/-1 times of harmonic component is generated in the grid-connected current reference quantity obtained by multiplying the quantity and the power grid voltage detection value, so that the controlled grid-connected current generates 6k +/-1 times of harmonic distortion; secondly, the grid voltage itself is often polluted by 6k ± 1 harmonic waves to a certain degree, the current loop adopting a PID controller or a state feedback controller generally cannot make the grid-connected current accurately track the sinusoidal signal, and especially when the grid-connected current value is far lower than the rated value, the controller is often difficult to effectively suppress external harmonic interference such as grid voltage distortion, and severe harmonic distortion occurs. In summary, the conventional control scheme is adopted for the three-phase grid-connected conversion circuit, and the situation that the harmonic distortion of the grid-connected current exceeds the standard still often occurs.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a method for eliminating harmonic distortion of grid-connected current by a three-phase grid-connected conversion circuit, which adopts a low-pass filter to eliminate ripples of 6 times of power frequency and higher frequency in the output quantity of a direct-current bus voltage controller used by a controller of the grid-connected conversion circuit, inserts a parallel 6k +/-1 or 6k harmonic repetitive controller into a converter current loop controller aiming at 6k +/-1 harmonic distortion pollution in the three-phase grid-connected current, and superposes the two to achieve the aim of quickly, accurately and thoroughly eliminating the harmonic distortion of the grid-connected current.
The technical scheme adopted by the invention is as follows: a method for eliminating grid-connected current harmonic distortion by a three-phase grid-connected conversion circuit comprises the following steps:
adjusting the voltage of the direct current bus by adopting a voltage loop controller according to the deviation value of the given reference value of the voltage of the direct current bus and the detection feedback value of the given reference value;
eliminating ripple wave components with power frequency 6 times and higher frequency in the output quantity of the voltage loop controller by adopting a low-pass filter;
multiplying the output value of the low-pass filter with the detection value of the grid voltage to obtain a reference value of grid-connected current;
regulating the grid-connected current by adopting a current loop controller according to the deviation value of the reference value of the grid-connected current and the detection feedback value of the grid-connected current;
the selective harmonic repetitive controller is connected in parallel and added into the current loop controller, the grid-connected current steady-state no-difference tracking reference current is realized in a targeted manner, the 6k +/-1 harmonic component in the grid-connected current is effectively eliminated, and the harmonic distortion of the grid-connected current is further reduced;
the current loop controller outputs a control signal to a control circuit of the PWM conversion circuit; the control circuit of the PWM conversion circuit outputs a PWM switching signal to the PWM conversion circuit based on the received control signal.
In the technical scheme, the output end of the voltage loop controller is connected with the low-pass filter in series, so that ripple components of 6 times of power frequency and higher frequency in the output of the direct-current bus voltage controller are removed.
In the technical scheme, the current loop controller in the abc static coordinate system is formed by connecting a feedback controller and a 6k +/-1 harmonic repetition controller in parallel. The 6k +/-1 harmonic repetitive controller can realize steady-state error-free tracking of the reference current of the grid-connected current, effectively inhibit external interference such as 6k +/-1 harmonic distortion of the grid voltage and the like, and further reduce the harmonic distortion of the grid-connected current.
In the technical scheme, the current loop controller under the synchronous rotating coordinate system is formed by connecting a feedback controller and a 6 k-order harmonic repetitive controller in parallel. The 6k harmonic repetitive controller can realize steady-state no-difference tracking of the reference current of the grid-connected current, effectively inhibit external interference such as 6k +/-1 harmonic distortion of the grid voltage and further reduce the harmonic distortion of the grid-connected current.
In the technical scheme, the cut-off frequency of the low-pass filter is higher than 2 times of the bandwidth of the voltage loop controller, but lower than 3 times of the power frequency angular frequency of the power grid voltage, so that the interference of 6 times of power frequency angular frequency ripple waves in a direct-current bus voltage feedback signal is effectively eliminated, and meanwhile, the dynamic response and the like of the existing control loop are not obviously influenced.
In the above technical solution, in the abc static coordinate system, the transfer function G of the 6k ± 1 th harmonic repetitive controller rc (s) is:
wherein k is rc To control the gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage. The 6k +/-1 harmonic repetitive controller can realize steady-state error-free tracking of the reference current of the grid-connected current, effectively inhibit external harmonic interference such as grid voltage 6k +/-1 harmonic distortion and the like, and further reduce the harmonic distortion of the grid-connected current. Compared with the conventional repetitive controller, the 6k +/-1 harmonic repetitive controller occupies less computing resources such as a memory, and the response speed of eliminating the 6k +/-1 harmonic in the current can be increased to 3 times.
In the above technical solution, in the synchronous rotation coordinate system, the transfer function G of the 6 k-th harmonic repetitive controller rc (s) is:
wherein k is rc To control the gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage. The 6k harmonic repetitive controller under the synchronous rotating coordinate system can realize the steady-state no-difference tracking reference current of the grid-connected current, effectively inhibit external harmonic interference such as 6k +/-1 harmonic distortion in the grid voltage and further reduce the harmonic distortion of the grid-connected current. Compared with the conventional repetitive controller, the 6k harmonic repetitive controller occupies less computing resources such as memory, and the response speed of eliminating 6k +/-1 harmonic in current can be increased to 3 times.
The beneficial effects of the invention are: the control strategy adopted by the invention consists of a direct current bus voltage feedback control loop and a grid-connected current feedback control loop, wherein a voltage loop controller is adopted to regulate the direct current bus voltage so that the direct current bus voltage stably tracks a given reference value; the current loop controller is adopted to adjust the grid-connected current, so that the grid-connected current accurately tracks the reference value of the grid-connected current, and the harmonic distortion of the current of the power grid is effectively inhibited. According to the invention, a low-pass filter is added behind a direct-current bus voltage controller to eliminate ripple components of 6 times of power frequency and higher frequency, so that 6k +/-1 harmonic distortion of grid-connected current is reduced; according to the invention, the grid-connected current controller under the abc static coordinate system is added with the 6k +/-1 harmonic repetitive controller in parallel, or the grid-connected current controller under the synchronous rotating coordinate system is added with the 6k harmonic repetitive controller in parallel, so that the grid-connected current stable state error-free tracking reference current is realized, external interference such as 6k +/-1 harmonic distortion in the grid voltage is effectively inhibited, and the grid-connected current harmonic distortion is further reduced. Compared with the conventional repetitive controller, the 6k +/-1 or 6k harmonic repetitive controller occupies less computing resources such as memory, and the response speed of eliminating the 6k +/-1 harmonic in the current can be improved to 3 times.
Drawings
Fig. 1 shows a main circuit and a control circuit of a three-phase grid-connected converter according to the present invention.
Fig. 2 shows a three-phase Boost PFC main circuit and a control circuit according to an embodiment.
FIG. 3 shows three-phase grid-connected current i when the three-phase Boost PFC control circuit adopts conventional PID dual-loop control a ， i b ， i c And three-phase AC network voltage v a ， v b ， v c And a DC bus voltage v dc The simulated waveform of (2).
FIG. 4 shows the three-phase AC network voltage v after a low-pass filter H(s) is added to the three-phase Boost PFC control circuit a ， v b ， v c And three-phase grid-connected current i a ， i b ， i c And a DC bus voltage v dc And (5) simulating a waveform.
FIG. 5 shows a three-phase Boost PFC control circuit with a low-pass filter H(s) and a current loop 6k + -1 harmonic repetitive controller G rc (s) after, three-phase AC mains voltage v a ， v b ， v c And three-phase grid-connected current i a ， i b ， i c And a DC bus voltage v dc And (5) simulating a waveform.
Fig. 6 is a comparison diagram of the grid-connected current THD under three control modes of the conventional PI controller, the conventional controller + low-pass filter H(s), and the conventional controller + low-pass filter H(s) + current repetitive controller.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in fig. 1, the invention provides a method for eliminating grid-connected current harmonic distortion by a three-phase grid-connected conversion circuit, which comprises the following steps:
adjusting the voltage of the direct current bus by adopting a voltage loop controller according to the deviation value of the given reference value of the voltage of the direct current bus and the detection feedback value of the given reference value;
eliminating ripple components of 6 times of power frequency and higher frequency in the output value of the voltage controller loop by the output value of the voltage loop controller through a low-pass filter, and multiplying the ripple components by the detection value of the grid voltage to obtain a reference value of grid-connected current;
according to the deviation value of the reference value of the grid-connected current and the detection feedback value of the grid-connected current, the grid-connected current is adjusted by adopting a current loop controller, the feedback controller is connected in parallel with a harmonic repetitive controller to realize the steady-state error-free tracking of the grid-connected current to the current loop controller, so that the external harmonic interference such as grid voltage distortion is effectively inhibited, the 6k +/-1 harmonic component in the grid-connected current is thoroughly eliminated, and the harmonic distortion of the grid-connected current is further reduced;
the current loop controller outputs a control signal to a control circuit of the PWM conversion circuit; a control circuit of the PWM conversion circuit outputs a PWM switching signal to the PWM conversion circuit based on the received control signal.
Specifically, the collected value of the grid voltage is processed by the phase-locked loop to be used as a detected value of the grid voltage.
The output end of the voltage ring controller is connected with a low-pass filter H(s) in series, and the output value of the direct current bus voltage ring controller is subjected to low-pass filtering treatment to eliminate 6 times of power frequency components in the output quantity of the voltage controller ring. In particular, the cut-off frequency of the low-pass filter H(s) is higher than 2 times the conventional control voltage loop bandwidth, but lower than 3w 0 In which w 0 For grid voltage power frequency angular frequency to effectively eliminate the interference of grid voltage power frequency angular frequency ripple wave of 6 times in the direct current bus voltage feedback signal, can not cause obvious influence to the dynamic response of current control loop simultaneously yet.
Specifically, the current loop controller under the abc static coordinate system is formed by connecting a feedback controller and a 6k +/-1 subharmonic repetitive controller in parallel.
Transfer function G of the 6k +/-1 subharmonic repetitive controller rc (s) is:
wherein k is rc To control the gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage.
Specifically, the current loop controller under the synchronous rotating coordinate system is formed by connecting a feedback controller and a 6 k-order harmonic repetition controller in parallel.
Transfer function G of the 6k subharmonic repetitive controller rc (s) is:
wherein k is rc To control the gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage.
The specific embodiment takes a conventional three-phase Boost PFC circuit as an example, wherein the three-phase power grid voltage v a ，v b ，v c Has a fundamental wave frequency of 50Hz, 220V (effective value) and contains 250Hz, a 5 th harmonic component of 11V and a 7 th harmonic component of 350 Hz 6V. The control system of the three-phase Boost PFC circuit is composed of a direct-current bus voltage v dc Voltage control outer loop and three-phase grid-connected current i a ，i b ，i c The current control inner ring. The voltage control outer ring adopts a PI controller, and the current control inner ring adopts a PID controller. Reference value i of the current control inner loop ref From the mains voltage v a ，v b ，v c The detected value of the voltage loop PI controller is processed by the phase-locked loop and then is compared with the output value u of the voltage loop PI controller v The two are multiplied to obtain.
As shown in fig. 3, the grid-connected current i of the three-phase Boost PFC circuit if the conventional feedback control scheme is adopted a ，i b ，i c The relatively serious harmonic distortion still appears in the grid-connected current, and the total harmonic distortion of the grid-connected current is up to 6.22%. The main reasons include: on the one hand, the converter DC bus voltage v is caused by AC/DC power conversion dc And the detection value contains 6 times of ripple component of power frequency of the power grid, thereby causing the output control value u of the direct-current voltage outer loop PI controller v Contains 6 times of power frequency components of the power grid, resulting in the output value of the voltage loop PI controller and the power grid voltage v ac The grid-connected current reference value i is obtained by multiplying power frequency fundamental component a * ，i b * ，i c * The 5 th harmonic component and the 7 th harmonic component appear in the grid-connected current, so that the 5 th harmonic distortion and the 7 th harmonic distortion appear in the grid-connected current; on the other hand, the network voltage v a ，v b ，v c In the 5 th harmonic component and the 7 th harmonic component, the grid-connected current loop PID controller usually cannot make the grid-connected current accurately track the sinusoidal signal, so that it is difficult to suppress external harmonic interference such as grid voltage distortion, and especially when the grid-connected current value is far lower than the rated value, the grid-connected current harmonic distortion is aggravated.
For the above problem of harmonic distortion of the grid-connected current, as shown in fig. 2, the conventional control scheme is improved as follows in the present embodiment:
(1) Aiming at 6 times of power frequency ripple components contained in the direct current bus voltage, a low-pass filter H(s) is connected in series behind a direct current bus voltage loop controller, so that grid connection is avoidedCurrent reference value i a * ，i b * ，i c * The 5 and 7 and higher harmonic components occur. The cut-off frequency of the low-pass filter H(s) is higher than 2 times the bandwidth of the conventional control voltage loop, but lower than 3w 0 In which w 0 The method is used for effectively eliminating interference of grid voltage power frequency angular frequency ripple waves 6 times of a direct current bus voltage feedback signal, and meanwhile, the method cannot obviously influence dynamic response and the like of an existing control loop.
As shown in fig. 4, the harmonic distortion of the grid-connected current is reduced from 6.22% to 5.0% after the low-pass filter H(s) is added.
For realizing grid-connected current i a ，i b ，i c Steady state error-free tracking of its reference value i a * ，i b * ，i c * Adding a parallel selective harmonic repeat controller G on a conventional PID feedback controller rc And(s) forming a composite controller for realizing steady-state error-free tracking of the grid-connected current to the reference current, pertinently and thoroughly eliminating the influence of 6k +/-1 harmonic error in a grid-connected current signal and grid voltage harmonic disturbance, and further reducing the harmonic distortion of the grid-connected current.
Under an ABC static coordinate system, a 6k +/-1 subharmonic repetitive controller with a transfer function of
Under a synchronous rotating coordinate system, a 6k +/-1 subharmonic repetitive controller is adopted, and the transfer function is as follows:
wherein the gain k is controlled rc E (0, 2), phase compensator G f (z) taking system, Q(s) is a low-pass filter, T 0 The fundamental period of the grid voltage.
As shown in fig. 5 and 6, a 6k +/-1 subharmonic repetitive controller G is further added rc After(s), the harmonic distortion of the grid-connected current is finally reduced to 0.77% from 5%.
In conclusion, by adopting the control strategy provided by the invention, the power factor of the system can be improved, and the total harmonic distortion of the grid-connected current can be reduced. Compared with the conventional repetitive controller, the 6k +/-1 or 6k harmonic repetitive controller occupies less computing resources such as memory and the like, and the response speed of eliminating the 6k +/-1 harmonic in the current can be increased to 3 times.
Those not described in detail in this specification are within the skill of the art.
Claims (6)
1. A method for eliminating grid-connected current harmonic distortion by a three-phase grid-connected conversion circuit is characterized by comprising the following steps: the method comprises the following steps:
adjusting the voltage of the direct current bus by adopting a voltage loop controller according to the deviation value of the given reference value of the voltage of the direct current bus and the detection feedback value of the given reference value;
eliminating ripple components of 6 times of power frequency and higher frequency in the output quantity of the voltage controller loop by adopting a low-pass filter;
multiplying the output value of the low-pass filter with the detection value of the grid voltage to obtain a reference value of grid-connected current;
regulating the grid-connected current by adopting a current loop controller according to the deviation value of the reference value of the grid-connected current and the detection feedback value of the grid-connected current;
connecting the selective harmonic repetitive controller in parallel into a current loop controller, tracking a reference signal and eliminating 6k +/-1 harmonic components in grid-connected current;
the current loop controller outputs a control signal to a control circuit of the PWM conversion circuit; the control circuit of the PWM conversion circuit outputs a PWM switching signal to the PWM conversion circuit based on the received control signal.
2. The method of claim 1, wherein: and the current loop controller in the abc static coordinate system is formed by connecting a feedback controller and a 6k +/-1 subharmonic repetitive controller in parallel.
3. The method of claim 1, wherein: the current loop controller under the synchronous rotating coordinate system is formed by connecting a feedback controller and a 6 k-th harmonic repetition controller in parallel.
4. A method according to claim 2 or 3, characterized in that: the cut-off frequency of the low-pass filter is higher than 2 times of the bandwidth of the voltage loop controller, but lower than 3 times of the power frequency angular frequency of the power grid voltage.
5. The method of claim 2, wherein: transfer function G of 6k +/-1 subharmonic repetitive controller under abc static coordinate system rc (s) is:
wherein k is rc To control the gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage.
6. The method of claim 3, wherein: transfer function G of 6k subharmonic repetitive controller under synchronous rotation coordinate system rc (s) is:
wherein k is rc To control the gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160254742A1 (en) * | 2015-02-27 | 2016-09-01 | Det International Holding Limited | PFC Current shaping |
| CN109861563A (en) * | 2019-03-19 | 2019-06-07 | 南京工程学院 | PWM rectifier control method based on bearing power feedforward and Repetitive controller |
| CN111142389A (en) * | 2020-01-19 | 2020-05-12 | 江南大学 | Customized harmonic wave repetitive controller and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160254742A1 (en) * | 2015-02-27 | 2016-09-01 | Det International Holding Limited | PFC Current shaping |
| CN109861563A (en) * | 2019-03-19 | 2019-06-07 | 南京工程学院 | PWM rectifier control method based on bearing power feedforward and Repetitive controller |
| CN111142389A (en) * | 2020-01-19 | 2020-05-12 | 江南大学 | Customized harmonic wave repetitive controller and control method |
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| 浣喜明, 高等教育出版社 * |
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