阅读说明：本技术 一种基于两路线电压采样的整流器相序自适应方法 (Rectifier phase sequence self-adaption method based on two-line voltage sampling ) 是由 欧阳凡 王胜勇 卢家斌 于 2020-06-15 设计创作，主要内容包括：本发明提供的是基于两路线电压采样的整流器相序自适应方法及系统,该方法包括：对输入的三相电压进行两路电压U<Sub>RS</Sub>以及U<Sub>ST</Sub>进行定时中断采样；通过滞环环节获得线电压过零信号ZERO<Sub>RS</Sub>以及ZERO<Sub>ST</Sub>；通过判断线电压过零信号ZERO<Sub>RS</Sub>以及ZERO<Sub>ST</Sub>可以得到输入三相电压的相序；通过已知相序驱动对应的桥臂的导通关断。本发明易于实现,能够有效的确保安全,可以在获得两路线电压的情况下,判断出整流器输入的三相电压的时序,并且根据相序控制对应桥臂的导通,确保系统在输入三相电压相序未知的情况下正常运行。(The invention provides a rectifier phase sequence self-adaptive method and a rectifier phase sequence self-adaptive system based on two-path line voltage sampling, wherein the method comprises the following steps: two-way voltage U is carried out on input three-phase voltage RS And U ST Carrying out timed interrupt sampling; obtaining ZERO-crossing signal ZERO of line voltage through hysteresis loop RS And ZERO ST (ii) a By judging the ZERO-crossing signal ZERO of the line voltage RS And ZERO ST The phase sequence of the input three-phase voltage can be obtained; and driving the corresponding bridge arm to be switched on and off through the known phase sequence. The method is easy to realize, can effectively ensure safety, can judge the time sequence of the three-phase voltage input by the rectifier under the condition of obtaining two-path line voltage, and controls the conduction of the corresponding bridge arm according to the phase sequence to ensure that the system can normally operate under the condition of unknown phase sequence of the input three-phase voltage.)

1. The rectifier phase sequence self-adaptive method based on two-path line voltage sampling is characterized by comprising the following steps of: sequentially comprises the following steps:

step 1, inputting three-phase AC line voltage signal U_RS、U_STPerforming timed interrupt sampling with a sampling period of T;

step 2, passing through a hysteresis link and setting a hysteresis valueDelta U carries out hysteresis ZERO-crossing comparison to obtain ZERO-crossing signal ZERO_RS、ZERO_ST；

Step 3, passing a ZERO-crossing signal ZERO_RS、ZERO_STJudging the phase sequence of the input phase voltage;

and 4, selecting a corresponding rectifier bridge arm conduction time sequence according to the phase sequence of the input phase voltage.

2. The rectifier phase sequence adaptive method based on two-line voltage sampling according to claim 1, characterized in that: step 1 is embodied as the line voltage U between R, S of the rectifier input port R, S, T_RSAnd S, T between the line voltage U_STAnd performing timed interrupt sampling by setting the sampling period to be T.

3. The rectifier phase sequence adaptive method based on two-line voltage sampling according to claim 1, characterized in that: step 2 is specifically to obtain a ZERO-crossing signal ZERO by hysteresis loop link and hysteresis loop ZERO-crossing comparison through the hysteresis loop value delta U_RS、ZERO_ST. When U is turned_RSAnd U_STWhen the value is greater than or equal to delta U, the corresponding ZERO-crossing signal ZERO_RS、ZERO_STIs 1; when U is turned_RSAnd U_STWhen the ZERO-crossing signal is less than or equal to-delta U, the corresponding ZERO-crossing signal ZERO_RS、ZERO_STIs 0.

4. The rectifier phase sequence adaptive method based on two-line voltage sampling according to claim 1, characterized in that: step 3 is specifically to pass through ZERO-crossing signal ZERO_RS、ZERO_STAnd judging the phase sequence of the input three-phase voltage. When ZERO_RSIs changed from 0 to 1, and the ZERO is then performed_STIs 1, then U_STLeading U_RSThe three-phase voltage input at this time is in a reverse order U, W, V (in a positive order of U, V, W); when ZERO_RSIs changed from 0 to 1, and the ZERO is then performed_STIs 0, then U_RSLeading U_STThe three-phase voltage input at this time is positive U, V, W.

5. The rectifier phase sequence adaptive method based on two-line voltage sampling according to claim 1, characterized in that: and step 4, specifically, determining the conduction time sequence of the 6-circuit rectifier bridge arm according to the time sequence of the input three-phase voltage.

6. Rectifier phase sequence adaptive system based on two way line voltage sampling, its characterized in that: sequentially comprises the following steps:

a sampling unit for inputting three-phase AC line voltage signal U_RS、U_STPerforming timed interrupt sampling with a sampling period of T;

a comparison unit: obtaining a ZERO-crossing signal ZERO through hysteresis loop and hysteresis loop ZERO-crossing comparison by setting a hysteresis loop value delta U_RS、ZERO_ST；

A judging unit: by ZERO-crossing signal ZERO_RS、ZERO_STJudging the phase sequence of the input phase voltage;

a selection determination unit: and selecting a corresponding rectifier bridge arm conduction time sequence according to the phase sequence of the input phase voltage.

7. The rectifier phase sequence adaptive system based on two-way line voltage sampling according to claim 1, characterized in that: the sampling unit is specifically the line voltage U between R, S of the rectifier input port R, S, T_RSAnd S, T between the line voltage U_STAnd performing timed interrupt sampling by setting the sampling period to be T.

8. The rectifier phase sequence adaptive system based on two-way line voltage sampling according to claim 1, characterized in that: the comparison unit carries out hysteresis ZERO-crossing comparison through a hysteresis link and a set hysteresis value delta U to obtain a ZERO-crossing signal ZERO_RS、ZERO_ST. When U is turned_RSAnd U_STWhen the value is greater than or equal to delta U, the corresponding ZERO-crossing signal ZERO_RS、ZERO_STIs 1; when U is turned_RSAnd U_STWhen the ZERO-crossing signal is less than or equal to-delta U, the corresponding ZERO-crossing signal ZERO_RS、ZERO_STIs 0.

9. The rectifier phase sequence adaptive system based on two-way line voltage sampling according to claim 1, characterized in that: the judging unit passes through a ZERO-crossing signal ZERO_RS、ZERO_STAnd judging the phase sequence of the input three-phase voltage. When ZERO_RSIs changed from 0 to 1, and the ZERO is then performed_STIs 1, then U_STLeading U_RSThe three-phase voltage input at this time is in a reverse order U, W, V (in a positive order of U, V, W); when ZERO_RSIs changed from 0 to 1, and the ZERO is then performed_STIs 0, then U_RSLeading U_STThe three-phase voltage input at this time is positive U, V, W.

10. The rectifier phase sequence adaptive system based on two-way line voltage sampling according to claim 1, characterized in that: the selection determination unit determines the conduction time sequence of the 6-circuit rectifying bridge arms according to the time sequence of the input three-phase voltage.

Technical Field

The invention belongs to the technical field of rectification, and particularly relates to a rectifier phase sequence self-adaption method based on two-path line voltage sampling.

Background

Rectification technology is widely applied to various industrial occasions, and the time sequence of three-phase alternating current input by the rectification technology is generally unknown. The wrong phase sequence generally causes the rectifier to be damaged or the direct current bus voltage of the rectified current is low, so that the industrial requirement cannot be met. Therefore, the current solutions are mainly divided into two main categories of hardware and software. The hardware is mainly added with a phase sequence detector. The phase sequence detector can display whether the input phase sequence is correct, and when the phase sequence is incorrect, the input phase sequence must be changed manually. This solution makes the rectifier costly and time consuming. The software scheme generally calculates the angle of the input phase voltage according to the phase-locked loop, so as to judge the phase sequence. The scheme is complex in design and requires adjustment of corresponding parameters. The method for judging the phase sequence through the line voltage and changing the bridge arm conduction time sequence according to the phase sequence has the advantages of simple design, quick response and cost saving.

Disclosure of Invention

The invention mainly solves the technical problems that: under the condition that the phase sequence of the three-phase alternating current input by the rectifier is uncertain, the three-phase alternating current rectifier can automatically adapt to the input of the three-phase alternating current of various phase sequences, the scheme is simple to realize, and the cost is saved.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the rectifier phase sequence self-adaptive method based on two-path line voltage sampling is characterized by comprising the following steps of: sequentially comprises the following steps:

step 1, inputting three-phase AC line voltage signal U_RS、U_STPerforming timed interrupt sampling with a sampling period of T;

step 2, hysteresis ZERO-crossing comparison is carried out through a hysteresis link and a set hysteresis value delta U to obtain a ZERO-crossing signal ZERO_RS、ZERO_ST；

Step 3, passing a ZERO-crossing signal ZERO_RS、ZERO_STJudging the phase sequence of the input phase voltage;

and 4, selecting a corresponding rectifier bridge arm conduction time sequence according to the phase sequence of the input phase voltage.

In the above rectifier phase sequence adaptive method based on two-line voltage sampling, the step 1 is specifically a line voltage U between R, S of the rectifier input port R, S, T_RSAnd S, T between the line voltage U_STAnd performing timed interrupt sampling by setting the sampling period to be T.

In the above rectifier phase sequence adaptive method based on two-line voltage sampling, the step 2 is specifically to obtain the ZERO-crossing signal ZERO by performing hysteresis ZERO-crossing comparison through a hysteresis link and setting a hysteresis value delta U_RS、ZERO_ST. When U is turned_RSAnd U_STWhen the value is greater than or equal to delta U, the corresponding ZERO-crossing signal ZERO_RS、ZERO_STIs 1; when U is turned_RSAnd U_STWhen the ZERO-crossing signal is less than or equal to-delta U, the corresponding ZERO-crossing signal ZERO_RS、ZERO_STIs 0.

In the aforementioned rectifier phase sequence adaptive method based on two-line voltage sampling, step 3 is specifically to pass through a ZERO-crossing signal ZERO_RS、ZERO_STAnd judging the phase sequence of the input three-phase voltage. When ZERO_RSIs changed from 0 to 1, and the ZERO is then performed_STIs 1, then U_STLeading U_RSThe three-phase voltage input at this time is in a reverse order U, W, V (in a positive order of U, V, W); when ZERO_RSIs changed from 0 to 1, and the ZERO is then performed_STIs 0, then U_RSLeading U_STThe three-phase voltage input at this time is positive U, V, W.

In the above rectifier phase sequence adaptive method based on two-line voltage sampling, the step 4 is specifically to determine the conduction time sequence of 6-line rectifier bridge arms according to the time sequence of the input three-phase voltage.

Rectifier phase sequence adaptive system based on two way line voltage sampling, its characterized in that: sequentially comprises the following steps:

a sampling unit for inputting three-phase AC line voltage signal U_RS、U_STPerforming timed interrupt sampling with a sampling period of T;

a comparison unit: obtaining a ZERO-crossing signal ZERO through hysteresis loop and hysteresis loop ZERO-crossing comparison by setting a hysteresis loop value delta U_RS、ZERO_ST；

A judging unit: by ZERO-crossing signal ZERO_RS、ZERO_STJudging the phase sequence of the input phase voltage;

a selection determination unit: and selecting a corresponding rectifier bridge arm conduction time sequence according to the phase sequence of the input phase voltage.

In the above rectifier phase sequence adaptive system based on two-way line voltage sampling, the sampling unit is specifically the line voltage U between R, S of the rectifier input port R, S, T_RSAnd S, T between the line voltage U_STAnd performing timed interrupt sampling by setting the sampling period to be T.

In the rectifier phase sequence adaptive system based on two-path line voltage sampling, the comparison unit performs hysteresis ZERO-crossing comparison through the hysteresis link and the set hysteresis value delta U to obtain the ZERO-crossing signal ZERO_RS、ZERO_ST. When U is turned_RSAnd U_STWhen the value is greater than or equal to delta U, the corresponding ZERO-crossing signal ZERO_RS、ZERO_STIs 1; when U is turned_RSAnd U_STWhen the ZERO-crossing signal is less than or equal to-delta U, the corresponding ZERO-crossing signal ZERO_RS、ZERO_STIs 0.

In the rectifier phase sequence adaptive system based on two-line voltage sampling, the judging unit passes through the ZERO-crossing signal ZERO_RS、ZERO_STAnd judging the phase sequence of the input three-phase voltage. When ZERO_RSIs changed from 0 to 1, and the ZERO is then performed_STIs 1, then U_STLeading U_RSThe three-phase voltage input at this time is in a reverse order U, W, V (in a positive order of U, V, W); when ZERO_RSIs changed from 0 to 1, and the ZERO is then performed_STIs 0, then U_RSLeading U_STThe three-phase voltage input at this time is positive U, V, W.

In the rectifier phase sequence adaptive system based on two-line voltage sampling, the selection judgment unit determines the conduction time sequence of 6-line rectifier bridge arms according to the time sequence of input three-phase voltage.

The rectifier phase sequence self-adaption method based on two-path line voltage sampling can keep the rectifier to normally and stably work under the condition of not determining the phase sequence of the input three-phase alternating current.

The invention has the beneficial effects that: 1. according to the input three-phase alternating-current line voltage, the phase sequence of the three-phase alternating current can be rapidly determined; 2. and aiming at different phase sequences, different bridge arm conduction time sequences are determined, so that the normal work of the rectifier can be ensured.

Drawings

FIG. 1 is a system block diagram of an embodiment of the present invention.

Fig. 2 is a thyristor turn-on timing chart when the phase sequence of the input three-phase alternating current is a positive sequence.

Fig. 3 is a thyristor turn-on timing chart when the phase sequence of the input three-phase alternating current is reverse.

Fig. 4a is a processing diagram of zero-crossing delay of a sampled three-phase ac power line voltage signal (a phase sequence of a three-phase input power source is a positive sequence).

Fig. 4b is a processing diagram of zero-crossing delay of a sampled three-phase ac power line voltage signal (the phase sequence of the three-phase input power is a negative sequence).

Detailed Description

The invention is further illustrated with reference to the following description and embodiments in conjunction with the accompanying drawings: