CN113495514A - Output phase synchronization tracking control method applied to UPS parallel operation system - Google Patents
Output phase synchronization tracking control method applied to UPS parallel operation system Download PDFInfo
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- CN113495514A CN113495514A CN202110798759.9A CN202110798759A CN113495514A CN 113495514 A CN113495514 A CN 113495514A CN 202110798759 A CN202110798759 A CN 202110798759A CN 113495514 A CN113495514 A CN 113495514A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
Abstract
The invention discloses an output phase synchronization tracking control method applied to a UPS parallel operation system, wherein the UPS parallel operation system comprises a plurality of UPS units, and the UPS units comprise a host and at least one slave, and the output phase synchronization tracking control method is characterized by comprising the following steps: s1, setting a clock source of the UPS parallel operation system; s2, when the host sends the synchronous frame each time, the current inversion angle, the current frequency and the register value of the current timing postal delivery counting register are sent to the CAN communication bus as synchronous information; s3, after receiving the synchronization information, the slave machine corrects the synchronization information according to the phase change generated by the delay time difference, updates the current angle and frequency of the slave machine, completes the phase synchronization of the slave machine and the host machine, and performs the synchronization operation once in each power frequency period; the invention realizes the phase synchronization and tracking of each UPS unit in the UPS parallel operation system by the way of sharing the strong pull phase, not only has smaller operation amount, but also can ensure the high-precision synchronization error.
Description
Technical Field
The invention relates to the technical field of UPS parallel operation synchronization, in particular to an output phase synchronization tracking control method applied to a UPS parallel operation system.
Background
For a UPS parallel operation system, in order to enable the parallel operation system to operate stably, each incorporated UPS in the parallel operation system needs to constantly keep an output voltage phase consistent with other machines in the system, a difference between output inversion voltages of the UPS in the parallel operation system introduces a circulating current, the larger the difference, the larger the circulating current is, the smaller the circulating current is, the output efficiency of the UPS parallel operation system is reduced, and the larger circulating current causes high-voltage protection of a dc bus of the UPS to close inversion. Therefore, in the UPS parallel operation system, the accuracy of phase tracking synchronization between the UPSs plays a decisive role in the stability of the parallel operation system. In a traditional synchronization tracking method of a UPS parallel operation system, an inversion sine output zero-crossing CAP signal is generally adopted as a uniform synchronization source between UPSs, each UPS in the parallel operation system achieves tracking and synchronization of phases of each UPS by tracking a common CAP signal, the problem of multiple zero-crossing interferences frequently occurs when synchronization is performed based on the CAP signal, and synchronization errors are large.
Disclosure of Invention
The invention aims to provide an output phase synchronization tracking control method applied to a UPS parallel operation system, which realizes the phase synchronization and tracking of each UPS unit in the UPS parallel operation system in a mode of sharing a strong pull phase through information, has small operation amount and can ensure high-precision synchronization error.
In order to achieve the purpose, the invention adopts the following technical scheme:
an output phase synchronization tracking control method applied to a UPS parallel operation system, wherein the UPS parallel operation system comprises a plurality of UPS units, and the UPS units comprise a master machine and at least one slave machine, comprising the following steps:
s1, setting a clock source of the UPS parallel operation system;
s2, when the host sends the synchronous frame each time, the current inversion angle, the current frequency and the register value of the current timing postal delivery counting register are sent to the CAN communication bus as synchronous information;
and S3, after receiving the synchronization information, the slave machine corrects the synchronization information according to the phase change generated by the delay time difference, updates the current angle and frequency of the slave machine, completes the phase synchronization of the slave machine and the host machine, and performs the synchronization operation once in each power frequency period.
Preferably, the clock source in step S1 is based on the DSP chip TMS320F 28335; the chip TMS320F28335 is provided with two paths of CAN peripherals; each path of CAN has 32 mailboxes and a timing postal delivery counting register, uses a bit clock on a CAN bus and takes CAN communication baud rate as a counting clock time base; the 16 # mailbox is a special mailbox, when the 16 # mailbox successfully receives and sends signals through the timing postal delivery counting register, the timing postal delivery counter is cleared, and the timing postal delivery counter is used as a clock synchronization source of the UPS parallel operation system.
Preferably, the 16 # mailbox is used as a synchronous information sending and receiving mailbox of each UPS in the UPS parallel operation system; if the current UPS is the host, the 16 # mailbox needs to be configured into a sending mailbox through the setting of a timing postal delivery counting register; if the current UPS is a slave, the 16 # mailbox needs to be configured to be a receiving mailbox through a timing postal delivery counting register.
Preferably, the inversion angle of each UPS unit in the UPS parallel operation system is calculated in the PWM interruption according to the following formula:
angle_new＝angle_old+freq_new*Ts；
wherein, angle _ new is the current inversion angle, angle _ old is the inversion angle of the last interrupt period, freq _ new is the inversion frequency of the current power frequency period, and Ts is the PWM interrupt period.
Preferably, the delay time difference in step S3 is composed of:
A. the host collects the current inversion angle and frequency information of the host and sends the information into a No. 16 sending mailbox for preparation and sending, and the time delay from the angle calculation program to the execution of CAN sending operation is T1;
B. the master machine sends synchronous information to the slave machine through the CAN, and the signal transmission delay is T2;
C. the time delay from the successful receipt of the synchronization information by the slave to the updated use of the master synchronization information is T3.
Preferably, the angles and frequencies of the slaves in step S3 are updated by the following formulas, respectively:
angle _ fresh _ angle _ new (host) + (T1(s) + ts (s)) + T3 (s)). freq _ new;
freq_fresh＝freq_new；
where T1(s), T2(s), and T3(s) respectively denote units in which the current time base unit is converted into time seconds.
Preferably, the current angle and frequency update of the slave in step S3 is updated with a zero-crossing point.
After the technical scheme is adopted, the invention has the following beneficial effects: the invention carries out synchronization based on high-speed CAN communication, a host in the UPS parallel operation system directly transmits self inversion phase and frequency information to a slave through the high-speed CAN communication, the high performance and the reliability of the CAN are approved, and the UPS parallel operation system is widely applied to the aspects of industrial automation, ships, medical equipment, industrial equipment and the like; the phase synchronization method based on CAN communication has no problem of synchronizing a plurality of zero-crossing interferences based on CAP signals; through the mode of sharing the strong pulling phase position by information, the phase synchronization and tracking of each UPS unit in the UPS parallel operation system are realized, the operation amount is small, and the high-precision synchronization error can be ensured.
Drawings
FIG. 1 is a schematic diagram of the structure of the steps of the present invention;
FIG. 2 is a schematic diagram of the master timing and the slave timing structure according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and fig. 2, an output phase synchronization tracking control method applied to a UPS parallel system, the UPS parallel system including a plurality of UPS units, the plurality of UPS units including a master and at least one slave, includes the following steps:
s1, setting a clock source of the UPS parallel operation system;
the clock source in the step S1 is based on the DSP chip TMS320F 28335; the chip TMS320F28335 is provided with two paths of CAN peripherals; each path of CAN has 32 mailboxes, and each mailbox has a timing postal delivery counting register CANTSC which is a counter with 32 bits free operation, and the counter uses a bit clock on a CAN bus and takes CAN communication baud rate as a counting clock time base; the method comprises the following steps that a 16 # mailbox is a special mailbox, when a timing postal delivery counting register CANTSC is arranged in the 16 # mailbox to successfully receive and send signals, a timing postal delivery counter CANTSC is cleared, and the timing postal delivery counter CANTSC is used as a clock synchronization source of a UPS parallel operation system;
the 16 # mailbox is used as a synchronous information sending and receiving mailbox of each UPS in the UPS parallel operation system; if the current UPS is the host, the 16 # mailbox needs to be configured to be a sending mailbox through a timing postal delivery counting register CANTSC; if the current UPS is a slave, the 16 # mailbox needs to be configured as a receiving mailbox through a timing postal delivery counting register CANTSC;
s2, when the host sends the synchronous frame each time, the current inversion angle _ new, the current frequency freq _ new and the register value of the current timing postal delivery counting register CANTSC are used as synchronous information to be sent to the CAN communication bus;
the inversion angle of each UPS unit in the UPS parallel operation system is calculated in the PWM interruption process according to the following formula:
angle_new＝angle_old+freq_new*Ts；
wherein, angle _ new is the current inversion angle, angle _ old is the inversion angle of the last interrupt cycle, freq _ new is the inversion frequency of the current power frequency cycle, and Ts is the PWM interrupt cycle;
s3, after receiving the synchronization information, the slave machine corrects the phase change generated by the delay time difference T _ delay, and then updates the current angle _ new and the frequency freq of the slave machine to complete the phase synchronization of the slave machine and the host machine, and the synchronization operation is executed once in each power frequency period;
the delay time difference T _ delay in step S3 is composed of:
A. the host collects the current inversion angle and frequency information of the host and sends the information into a No. 16 sending mailbox for preparation and sending, and the time delay from the angle calculation program to the execution of CAN sending operation is T1;
B. the master machine sends synchronous information to the slave machine through the CAN, and the signal transmission delay is T2;
C. the time delay from the successful receipt of the synchronization information by the slave to the updated use of the master synchronization information is T3.
In order to keep phase tracking and synchronous refreshing pace of the master and the slave as consistent as possible in the synchronization process, after the master sends updating information and the slave needs to wait for receiving completion, angle and frequency updating operation is uniformly executed at a certain interruption time, and in the case of a single-phase UPS, the updating is carried out by using a zero crossing point;
the angles and frequencies of the slaves in step S3 are updated by the following formulas, respectively:
angle _ fresh _ angle _ new (host) + (T1(s) + ts (s)) + T3 (s)). freq _ new;
freq_fresh＝freq_new；
where T1(s), T2(s), and T3(s) respectively denote units in which the current time base unit is converted into time seconds.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. An output phase synchronization tracking control method applied to a UPS parallel operation system, wherein the UPS parallel operation system comprises a plurality of UPS units, and the UPS units comprise a master machine and at least one slave machine, the method comprises the following steps:
s1, setting a clock source of the UPS parallel operation system;
s2, when the host sends the synchronous frame each time, the current inversion angle, the current frequency and the register value of the current timing postal delivery counting register are sent to the CAN communication bus as synchronous information;
and S3, after receiving the synchronization information, the slave machine corrects the synchronization information according to the phase change generated by the delay time difference, updates the current angle and frequency of the slave machine, completes the phase synchronization of the slave machine and the host machine, and performs the synchronization operation once in each power frequency period.
2. The method as claimed in claim 1, wherein the clock source is based on a DSP chip TMS320F28335 in step S1; the chip TMS320F28335 is provided with two paths of CAN peripherals; each path of CAN has 32 mailboxes and a timing postal delivery counting register, uses a bit clock on a CAN bus and takes CAN communication baud rate as a counting clock time base; the 16 # mailbox is a special mailbox, when the 16 # mailbox successfully receives and sends signals through the timing postal delivery counting register, the timing postal delivery counter is cleared, and the timing postal delivery counter is used as a clock synchronization source of the UPS parallel operation system.
3. The output phase synchronization tracking control method applied to the UPS parallel operation system as claimed in claim 2, wherein: the 16 # mailbox is used as a synchronous information sending and receiving mailbox of each UPS in the UPS parallel operation system; if the current UPS is the host, the 16 # mailbox needs to be configured into a sending mailbox through the setting of a timing postal delivery counting register; if the current UPS is a slave, the 16 # mailbox needs to be configured to be a receiving mailbox through a timing postal delivery counting register.
4. The output phase synchronization tracking control method applied to the UPS parallel operation system according to claim 2, wherein the inversion angle of each UPS unit in the UPS parallel operation system is calculated in the PWM interrupt according to the following formula:
angle_new＝angle_old+freq_new*Ts；
wherein, angle _ new is the current inversion angle, angle _ old is the inversion angle of the last interrupt period, freq _ new is the inversion frequency of the current power frequency period, and Ts is the PWM interrupt period.
5. The output phase synchronization tracking control method applied to the UPS parallel operation system according to claim 4, wherein the delay time difference in step S3 is formed by:
A. the host collects the current inversion angle and frequency information of the host and sends the information into a No. 16 sending mailbox for preparation and sending, and the time delay from the angle calculation program to the execution of CAN sending operation is T1;
B. the master machine sends synchronous information to the slave machine through the CAN, and the signal transmission delay is T2;
C. the time delay from the successful receipt of the synchronization information by the slave to the updated use of the master synchronization information is T3.
6. The output phase synchronization tracking control method applied to the UPS parallel operation system according to claim 5, wherein the angles and frequencies of the slaves in step S3 are updated according to the following formulas:
angle _ fresh _ angle _ new (host) + (T1(s) + ts (s)) + T3 (s)). freq _ new;
freq_fresh＝freq_new；
where T1(s), T2(s), and T3(s) respectively denote units in which the current time base unit is converted into time seconds.
7. The output phase synchronization tracking control method applied to the UPS parallel operation system according to claim 6, characterized in that: the current angle and frequency update of the slave in step S3 is updated with the zero-crossing point.
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