CN113890171A - Method for realizing inversion carrier synchronization of UPS parallel operation system - Google Patents
Method for realizing inversion carrier synchronization of UPS parallel operation system Download PDFInfo
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- CN113890171A CN113890171A CN202111142057.1A CN202111142057A CN113890171A CN 113890171 A CN113890171 A CN 113890171A CN 202111142057 A CN202111142057 A CN 202111142057A CN 113890171 A CN113890171 A CN 113890171A
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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
- H02J9/062—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 for AC powered loads
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention relates to a method for realizing inversion carrier synchronization of a UPS parallel operation system, which comprises the steps of firstly configuring a time base synchronization function of a CAN mailbox during CAN communication, reading a count value of a CAN time base counter of a local machine when a PWM main interrupt is started, and assigning the count value to a specified variable for storage and standby; the host computer shares the CAN time base counting value as data information of carrier synchronization at a fixed time point of each power frequency period to a parallel computer CAN communication bus through CAN communication, after the CAN peripheral equipment of each slave computer receives the carrier synchronization information uploaded by the host computer, the error value of the CAN time base counting value of the host computer and the local computer at the start of PWM interruption is calculated, the error value is used as an inversion carrier synchronization regulation parameter of the parallel computer system, the PWM interruption period value of the slave computer is finely adjusted, and finally the error between the CAN counting values tends to zero, so that the inversion carrier synchronization between the UPS of the parallel computer system is realized.
Description
Technical Field
The invention relates to the field of UPS parallel operation, in particular to a method for realizing inversion carrier synchronization of a UPS parallel operation system.
Background
In order to ensure that the UPS parallel operation system has a good current equalizing effect, the synchronization of the inversion output phases of the UPSs is ensured, and the synchronization of the inversion carriers of the UPSs is also ensured. If only phase synchronization is available, synchronization of the inversion carriers of the UPSs is not realized, and the output currents of the UPSs are periodically attacked, so that the stability of the parallel operation system is influenced. The most direct way for carrier synchronization is to provide a common carrier synchronization signal through hardware, and when detecting the common carrier synchronization signal, each UPS control board CPU initializes a carrier PWM period value to complete carrier synchronization. In order to reduce the cost in the actual engineering, a DSP with a relatively low cost is often used as a control chip, which may cause a problem of insufficient IO resources, or the chip used does not have corresponding IO functions. The invention adopts a software algorithm to realize the synchronization of each UPS inversion carrier, has stronger platform adaptability compared with a hardware method, and simultaneously has stronger competitiveness as a low-cost realization mode.
Disclosure of Invention
The invention aims to provide a method for realizing inverse carrier synchronization of a UPS parallel operation system, which is used for solving the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
a method for realizing inversion carrier synchronization applied to a UPS parallel operation system comprises the following steps:
configuring a time base synchronization function of a CAN mailbox in UPS parallel machine communication, reading a count value of a current parallel machine CAN time base counter of a UPS local machine when entering PWM main interruption, and assigning the count value to a specified variable for storage; and the host sends the CAN time base count value to the slave through parallel CAN communication at the designated time point of the power frequency period, calculates the error value of the CAN time base count values of the host and the slave at the start of PWM interruption in the parallel system, carries out calculation analysis by substituting the error value into a carrier synchronization algorithm, and adjusts the PWM interruption period value of the slave according to the calculation result so as to synchronize the inversion carrier time sequences of the host and each slave in the parallel system.
Preferably, the function of configuring time base synchronization of the CAN mailbox in the UPS parallel machine communication includes: and the synchronization function of the 16 # mailbox in the parallel operation system is started through CAN communication and register configuration, the network global time sequence synchronization is realized, and the time base synchronization function of the CAN mailbox in the UPS parallel operation communication is realized.
Preferably, the master of the parallel operation system sends the carrier synchronization information to the slave through a designated synchronization information sending mailbox, and the slave is configured to receive the carrier synchronization information sent by the master of the parallel operation system.
Preferably, the UPS reads the count value of the current parallel CAN time-base counter when PWM is interrupted, the CAN time-base count value of the master is recorded as MCAN _ TSC, and the CAN time-base count value of the slave is recorded as SCAN _ TSCx.
Preferably, the process of reading the count value of the current parallel machine CAN time base counter comprises the following steps: and the CAN time base count value MCAN _ TSC of the host is sent by the set specific inversion carrier synchronization information sending mailbox, and the slave acquires the carrier synchronization information transmitted by the host through the parallel machine CAN bus and stores the carrier synchronization information through the designated variable.
Preferably, the slave compares the self CAN time base count value SCAN _ TSCx with the received master MCAN _ TSC value, if SCAN _ TSCx > MCAN _ TSC, it indicates that the current slave carrier phase lags behind the master carrier phase, at this time, the slave reduces the local PMW interrupt period by ts, and if SCAN _ TSCx < MCAN _ TSC, it indicates that the current slave carrier phase leads the master carrier phase, at this time, the slave increases the local PWM interrupt period by ts.
Preferably, the counting error of the CAN time base of the host and the slave is recorded as TSCX _ ERR, if the absolute value of the error is within the range of the maximum allowable error TSC _ ERR _ MAX, the carrier synchronization of the host and the slave is completed, and the setting operation is carried out corresponding to the carrier synchronization flag bit; if the absolute value of the error is not within the maximum allowable error range TSC _ ERR _ MAX, the steps are repeatedly executed until the time base counting error values of the master computer and the slave computers are within the maximum allowable error range.
The invention has the beneficial effects that:
(1) the invention shares and transmits necessary digital information for carrier synchronization through CAN communication of DSP, and then realizes inversion carrier synchronization through a designed algorithm for adjusting carrier synchronization; compared with a hardware method for transmitting common carrier synchronization signals, the method for realizing carrier synchronization through software has stronger electromagnetic interference resistance and can save hardware IO (input/output) resources of a hardware CPU (central processing unit).
(2) According to the invention, the PWM interruption period value of the slave is finely adjusted according to the designed carrier synchronization algorithm, and finally, the error between the CAN count values of the master and the slave at the beginning of PWM interruption tends to zero, thereby realizing the aim of inverse carrier synchronization among the UPSs of the parallel operation system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a flowchart illustrating a principle of implementing a carrier synchronization algorithm according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The method is realized by taking Texas instrument C2000 series DSP as a development platform;
an implementation method applied to inverse carrier synchronization of a UPS parallel operation system is shown in figure 1, and specifically comprises the following steps:
the method comprises the steps that CAN communication is adopted as a communication mode between a master machine and a slave machine of the UPS parallel operation system, the time base synchronization function of a CAN mailbox during CAN communication is configured, and in the running process of each UPS, when a software control program enters PWM master interruption, the count value of a CAN time base counter of a local machine is read and assigned to a designated variable to be stored for later use; when the UPS parallel machine system normally operates, the host machine shares the (recently stored) CAN time base counting value (as carrier synchronization data information) to a parallel machine CAN communication bus through CAN communication at a fixed time point of each power frequency period, the CAN peripheral of each slave machine receives the carrier synchronization information uploaded by the host machine, calculates the error value of the CAN time base counting value of the host machine and the host machine at the start of PWM interruption, takes the error value as an inversion carrier synchronization regulation parameter of the parallel machine system, and finely adjusts the PWM interruption period value of the slave machine according to a designed carrier synchronization algorithm, so that the error between the CAN counting values of the master machine and the slave machine at the start of PWM interruption tends to zero, and the aim of inversion carrier synchronization between the UPSs of the parallel machine system is fulfilled.
And (3) synchronous function configuration:
configuring a time base synchronization function (UPS is an uninterrupted power supply) of a CAN mailbox in UPS parallel machine communication, immediately reading a count value of a current parallel machine CAN time base counter of a UPS local machine when entering PWM main interruption, and assigning the count value to a specified variable for storage; the method comprises the steps that a CAN time base counting variable stored when the PWM interruption of a host computer starts is sent by the host computer through parallel CAN communication at a time point specified by a power frequency period to inform other slave computers, after the slave computers receive information transmitted by the host computer, errors of CAN time base counting values of the host computer and the slave computers in a parallel system when the PWM interruption starts are calculated, data are brought into a carrier synchronization algorithm designed by the invention for calculation and analysis, the period of the PWM value of the host computer interruption is adjusted according to a calculation judgment result, and the CAN time base counting errors of the machines at the same time point (each machine starts the PWM interruption and represents the same time point for collection) tend to zero through calculation and adjustment of a certain time, so that the inversion carrier timing sequence of the host computer and each slave computer in the parallel system is synchronized, and whether the synchronization is finished or not is judged according to the error.
To obtain a timing indication of CAN message frame acceptance or transmission, a free running 32-bit Timer (TSC) is used in the module. When a received message is stored or a message is sent, its contents (TSC) are written into the timing postal registers (MOTS) of the corresponding mailbox, and the TSC registers are also cleared when mailbox No. 16 is successfully sent or a message is received. Mailbox No. 16 can be used for global timing synchronization of the network. In order to start the timing reset function of the 16 # mailbox, the 15 th MBCC (mailbox timing postal counter clear bit) of a main control register (CANMC, 32 bit register) needs to be set to 1, the function is started, and the timing postal counter is not reset when the bit is 0.
The host of the parallel machine system sends mailbox information and carrier synchronization information to the slave machine through the appointed synchronization information, and the slave machine is used for receiving the carrier synchronization information sent by the host of the parallel machine system.
The CAN timebase count value of the slave is denoted as SCAN _ TSCx (x is 1,2,3,4 …) and the CAN timebase count value of the master is denoted as MCAN _ TSC.
The master will share the value of its own CAN timebase counter through CAN. After the communication of the master and the slave is normally established, the slave continuously inquires whether a designated CAN message receiving mailbox receives a carrier synchronization information frame transmitted by the master according to a PWM interruption period, and if the designated CAN message receiving mailbox receives the carrier synchronization information frame, corresponding data is stored into a designated variable to prepare for executing the next operation.
The parallel machine system is provided with state switching logic of a master machine and a slave machine, and can calculate the health state score of each machine according to the state of each machine, wherein the score is the highest value and is the master machine, each cycle is executed once, the corresponding master machine is provided with a corresponding master machine flag bit, and the flag bit is not set, so that the current slave machine is represented.
In the parallel operation system, the host sends the MCAN _ TSC value in the appointed time of each power frequency period through a set carrier synchronization information CAN to send the value, and the slave acquires the carrier synchronization information transmitted by the host from a CAN parallel operation bus and stores the carrier synchronization information through a defined global variable.
The slave machine compares the CAN time base counting value SCAN _ TSCx with the received master MCAN _ TSC value, if SCAN _ TSCx > MCAN _ TSC indicates that the current slave machine carrier phase lags behind the master machine carrier phase, the slave machine reduces the local PMW interrupt period by ts, if SCAN _ TSCx < MCAN _ TSC indicates that the current slave machine carrier phase leads the master machine carrier phase, the slave machine increases the local PWM interrupt period by ts; the flow chart of the implementation principle of the carrier synchronization algorithm is shown in fig. 2.
Detecting a master and slave CAN time base counting error (SCAN _ TSCx-MCAN _ TSC), recording the counting error as a variable TSCx _ ERR, and if the absolute value of the error is within the range of the maximum allowable error TSCx _ ERR _ MAX (the maximum error is not more than 2 CAN time base counting values), completing carrier synchronization of the master and the slave, and corresponding to a carrier synchronization flag bit; if the absolute value of the error is not within the range of the maximum allowable error TSC _ ERR _ MAX, the steps are repeatedly executed until the error is within the range.
The method realizes the carrier synchronization by adjusting the PWM interruption period value, reduces the interruption PWM period value to the bottom, or increases the PWM interruption period value, and the method completely depends on the comparison result of the CAN time base counting values of the slave machine and the host machine. If the PWM period of the machine is 8kHz and the off period register value PWM _ prd-9375, then PWM _ prd-9370 can be set to decrease the slave carrier period value, or PWM _ prd-9380 can be set to increase the slave carrier period value while the master carrier period is held at 8kHz, so that the carrier phase between the sub-machines changes. Through continuous repeated operation, the phase error between the machine carriers is close to zero finally, and when the phase error enters a set error range, the carriers are considered to be synchronized.
The invention shares and transmits necessary digital information for carrier synchronization through CAN communication of DSP, and then realizes inversion carrier synchronization through a designed algorithm for adjusting carrier synchronization; compared with a hardware method for transmitting common carrier synchronization signals, the method for realizing carrier synchronization through software has stronger electromagnetic interference resistance and can save hardware IO (input/output) resources of a hardware CPU (central processing unit).
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (7)
1. A method for realizing inversion carrier synchronization of a UPS parallel operation system is characterized by comprising the following steps:
configuring a time base synchronization function of a CAN mailbox in UPS parallel machine communication, reading a count value of a current parallel machine CAN time base counter of a UPS local machine when entering PWM main interruption, and assigning the count value to a specified variable for storage; and the host sends the CAN time base count value to the slave through parallel CAN communication at the designated time point of the power frequency period, calculates the error value of the CAN time base count values of the host and the slave at the start of PWM interruption in the parallel system, carries out calculation analysis by substituting the error value into a carrier synchronization algorithm, and adjusts the PWM interruption period value of the slave according to the calculation result so as to synchronize the inversion carrier time sequences of the host and each slave in the parallel system.
2. The method as claimed in claim 1, wherein the configuring the time base synchronization function of the CAN mailbox in the UPS parallel operation communication includes: and the synchronization function of the 16 # mailbox in the parallel operation system is started through CAN communication and register configuration, the network global time sequence synchronization is realized, and the time base synchronization function of the CAN mailbox in the UPS parallel operation communication is realized.
3. The method as claimed in claim 1, wherein the master of the parallel operation system sends the carrier synchronization information to the slave via a designated synchronization information sending mailbox, and the slave is configured to receive the carrier synchronization information sent by the master of the parallel operation system.
4. The method as claimed in claim 3, wherein the UPS reads the count value of the current parallel CAN timebase counter when PWM is interrupted, the CAN timebase count value of the master is denoted as MCAN _ TSC, and the CAN timebase count value of the slave is denoted as SCAN _ TSCx.
5. The method as claimed in claim 4, wherein the reading the count value of the current parallel CAN time base counter comprises: and the CAN time base count value MCAN _ TSC of the host is sent by the set specific inversion carrier synchronization information sending mailbox, and the slave acquires the carrier synchronization information transmitted by the host through the parallel machine CAN bus and stores the carrier synchronization information through the designated variable.
6. The method as claimed in claim 5, wherein the slave device compares its own CAN timebase count value SCAN _ TSCx with the received master MCAN _ TSC value, and if SCAN _ TSCx > MCAN _ TSC, it indicates that the current slave carrier phase lags the master carrier phase, and then the slave device decreases the local PMW interrupt period by ts, and if SCAN _ TSCx < MCAN _ TSC, it indicates that the current slave carrier phase leads the master carrier phase, and then the slave device increases the local PWM interrupt period by ts.
7. The method as claimed in claim 6, wherein the counting error of the master and slave CAN time bases is recorded as TSCx _ ERR, and if the absolute value of the error is within the maximum allowable error TSC _ ERR _ MAX, the master and slave carrier synchronization is completed and the setting operation is performed on the corresponding carrier synchronization flag bit; if the absolute value of the error is not within the maximum allowable error range TSC _ ERR _ MAX, the steps are repeatedly executed until the time base counting error values of the master computer and the slave computers are within the maximum allowable error range.
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Cited By (1)
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| CN114826540A (en) * | 2022-04-07 | 2022-07-29 | 福建星云电子股份有限公司 | Carrier synchronization method and system for rectifier inverter |
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