CN114337287B - Power conversion system, isolated converter and operation control method thereof - Google Patents
Power conversion system, isolated converter and operation control method thereof Download PDFInfo
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- CN114337287B CN114337287B CN202111590985.4A CN202111590985A CN114337287B CN 114337287 B CN114337287 B CN 114337287B CN 202111590985 A CN202111590985 A CN 202111590985A CN 114337287 B CN114337287 B CN 114337287B
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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
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a power conversion system, an isolated converter and an operation control method thereof, wherein when a rear-stage converter and a front-stage converter normally communicate, whether a communication borrowing instruction is received or not is respectively judged; if a communication borrowing instruction is received, the fact that the front-stage converter cannot timely receive the input electric quantity information of the rear-stage converter is indicated, and at the moment, the rear-stage converter and the front-stage converter enter a corresponding mode according to the communication borrowing instruction; then, the front-stage converter searches in a corresponding preset relation preset by the front-stage converter according to the detected and/or slowly communicated working condition information, and determines driving signal parameters corresponding to the working condition information, namely, the driving signal parameters are adjusted based on the preset relation between the driving signal parameters and the working condition information so as to control the front-stage converter to operate and ensure the stability of the input electric quantity of the rear-stage converter.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a power conversion system, an isolated converter and an operation control method thereof.
Background
Fig. 1a shows an isolated inverter, in which a low-voltage dc input is first passed through a pre-stage converter 101 to generate multiple isolated dc outputs, which are respectively used as dc bus inputs of post-stage converters 102, and then the ac sides of the post-stage converters 102 are cascaded to generate a high-voltage ac output.
In order to ensure the isolation of the front and rear stages, the control unit of the front-stage converter 101 takes power from the low-voltage direct-current input side thereof, and the control unit of each rear-stage converter 102 takes power from each direct-current bus thereof; and during normal operation of the system, each control unit of the subsequent stage communicates the DC bus voltage V of each subsequent stage converter 102 d1 ～V dN And the control signals are transmitted to a control unit of the front stage, so that the control unit of the front stage realizes closed-loop control.
However, in some modes of operation, such as upgrading, the communication bus is occupied by the upgrade data for a long period of time, with the respective dc bus voltages V of the subsequent stages d1 ～V dN Can not be timely transmitted to the front stage, and the control unit of the front stage can not be usedClosed loop control is realized, so that the voltage V of each direct current bus of the subsequent stage cannot be ensured d1 ～V dN And the voltage is stabilized at an expected value, namely, the overvoltage or undervoltage condition of the direct current bus can occur. When the direct current bus is overvoltage, the components in the subsequent converter are damaged; when the direct current bus is under voltage, the control unit of the later-stage converter is powered down, and the upgrading operation is interrupted. .
Disclosure of Invention
In view of the above, the present invention provides a power conversion system, an isolated converter and an operation control method thereof, so as to stabilize the input electric quantity of the later converter in the upgrade mode.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a first aspect of the present invention provides an operation control method of an isolated converter, the isolated converter including: at least one preceding stage converter, and at least one succeeding stage converter; the rear-stage converter is isolated from the front-stage converter connected with the rear-stage converter in a communication way, and the input electric quantity of the rear-stage converter is controlled by the front-stage converter connected with the rear-stage converter; the operation control method comprises the following steps:
when the rear-stage converter and the front-stage converter normally communicate, judging whether a communication borrowing instruction is received or not respectively;
if the communication borrowing instruction is received, the later-stage converter and the earlier-stage converter enter a corresponding mode according to the communication borrowing instruction;
and the front-stage converter searches in a corresponding preset relation preset by the front-stage converter according to the working condition information of the isolation-type converter, and determines driving signal parameters corresponding to the working condition information so as to control the front-stage converter to operate and ensure the stability of the input electric quantity of the rear-stage converter.
Optionally, the working condition information includes: electrical quantity information of the preceding converter and/or load condition information of the following converter.
Optionally, if the pre-stage converter adopts a fm modulation strategy, the driving signal parameters include: the variation range and period of the modulation frequency;
if the preceding stage converter adopts a duty cycle modulation strategy, the driving signal parameters include: modulating the variation range and period of the duty cycle;
if the pre-stage converter adopts a mixed modulation strategy of frequency modulation and duty cycle modulation, the driving signal parameters include: the variation range and period of the modulation frequency, and the variation range and period of the modulation duty cycle.
Optionally, the preset relationship is: and carrying out linear fitting or artificial intelligence algorithm analysis on the driving signal parameters simulated or actually measured under different working condition information to obtain a formula or table representing the relation between the driving signal parameters and the working condition information.
Optionally, before searching in the preset corresponding preset relation, the pre-stage converter further includes:
determining an input electric quantity control target of the rear-stage converter according to the working condition information;
And determining the preset relation corresponding to the input electric quantity control target.
Optionally, after the pre-stage converter controls itself to operate, the method further includes:
the back-stage converter is in slow communication with the front-stage converter; the communication period of the slow communication is longer than that of the normal communication;
the front-stage converter protects the input electric quantity of the rear-stage converter according to the updated input electric quantity information of the rear-stage converter under the slow communication; and/or the number of the groups of groups,
and the front-stage converter updates the working condition information according to the load condition information of the rear-stage converter updated by the rear-stage converter under the slow communication.
Optionally, before the post-stage converter enters the corresponding mode according to the communication borrowing instruction, the method further includes:
the rear-stage converter operates according to a preset mode;
and the back-stage converter also sends a readiness message to the front-stage converter to inform the front-stage converter to enter the corresponding mode according to the communication borrowing instruction at the same time or after entering the corresponding mode according to the communication borrowing instruction.
Optionally, the post-stage converter operates according to a preset mode, including:
The latter-stage converter gradually reduces output power to a wave-sealing state;
for the post-stage converter, the input electric quantity of which can be independently controlled by the pre-stage converter to which it is connected, the input electric quantity of which is controlled to a stable value;
for each of the subsequent converters to which the input electric quantity cannot be independently controlled by the preceding converter to which the input electric quantity is connected, the average value of the input electric quantity of each of the subsequent converters is controlled to a stable value, and each of the subsequent converters adjusts the power of an adjustable load carried by itself based on the average value target of the input electric quantity, so as to realize balance between the respective input electric quantities.
Optionally, for each of the subsequent converters to which the input electric power cannot be controlled independently by the preceding converter to which it is connected, after entering a corresponding mode according to the communication borrowing instruction, the method further includes:
the power of the adjustable load is adjusted to maintain a balance between the respective amounts of input electrical power.
Optionally, adjusting the power of the adjustable load to maintain a balance between the respective input electrical quantities includes:
if the self input electric quantity is within the preset fluctuation range of the control target, maintaining the power of the adjustable load unchanged;
If the self input electric quantity is smaller than the lower limit value of the preset fluctuation range, reducing the power of the adjustable load until the power of the adjustable load is zero;
if the self input electric quantity is larger than the upper limit value of the preset fluctuation range, the power of the adjustable load is increased until the power of the adjustable load is a full power value.
Optionally, the control target is:
the stable value of the self-input electric quantity is realized when the balance is realized; or alternatively, the process may be performed,
and when the rear-stage converter and the front-stage converter keep slow communication, the input electric quantity transmitted under the slow communication controls the target.
Optionally, the power adjustment of the adjustable load is a full power value before and/or after entering the corresponding mode according to the communication borrowing instruction.
Optionally, the adjustable load is a fan; by adjusting the rotational speed of the fan, power adjustment to the adjustable load is achieved.
Optionally, the mode that the later converter and the earlier converter enter according to the communication borrowing instruction is an upgrade mode.
The second aspect of the present invention also provides an isolated converter comprising: at least one preceding stage converter, and at least one succeeding stage converter;
The rear-stage converter and the connected front-stage converter are isolated from each other and are in communication connection;
the input electric quantity of the rear-stage converter is controlled by the front-stage converter connected with the rear-stage converter, and the rear-stage converter and the front-stage converter are matched to realize the operation control method of the isolated converter according to any section of the first aspect of the invention.
Optionally, when the number of the later-stage converters is greater than 1:
the input end of each back-stage converter receives the output electric energy of different output ends of the same front-stage converter respectively, or receives the output electric energy of the corresponding front-stage converter respectively; and/or the number of the groups of groups,
the output ends of the rear-stage converters are cascaded.
Optionally, the front-stage converter is an isolated DC/DC converter, and the rear-stage converter is a DC/AC converter; or alternatively, the process may be performed,
the front-stage converter is a DC/AC converter or an AC/AC converter, and the rear-stage converter is an AC/AC converter or an AC/DC converter; and the preceding stage converter is connected with the corresponding succeeding stage converter through a transformer.
The third aspect of the present invention also provides a power conversion system, comprising: at least one isolated converter as in any of the second preceding paragraphs.
Optionally, when the number of the isolated converters is greater than 1, the input ends of the isolated converters are connected in series or in parallel, and the output ends of the isolated converters are connected in series or in parallel; and/or the number of the groups of groups,
the input end and/or the output end of the isolation type converter is/are also provided with at least one stage of power converter.
The invention provides an operation control method of an isolated converter, which is used for respectively judging whether a communication borrowing instruction is received or not when a later-stage converter and a former-stage converter normally communicate; if a communication borrowing instruction is received, the fact that the front-stage converter cannot timely receive the input electric quantity information of the rear-stage converter, such as the direct current bus voltage in the structure shown in fig. 1a, is indicated, and at this time, the rear-stage converter and the front-stage converter enter corresponding modes according to the communication borrowing instruction; then, the front-stage converter searches in a corresponding preset relation preset by the front-stage converter according to the working condition information of the isolation-type converter, and determines driving signal parameters corresponding to the working condition information, namely, the driving signal parameters are adjusted based on the preset relation between the driving signal parameters and the working condition information so as to control the front-stage converter to operate, ensure the stability of the input electric quantity of the rear-stage converter, further avoid damaging circuit components due to the fact that the input electric quantity of the rear-stage converter exceeds a design range, and avoid upgrading interruption caused by the fact that a control unit of the rear-stage converter loses electricity in an upgrading process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the embodiments or the drawings to be used in the description of the prior art, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1a, 1b, 1c and 1d are schematic views of four structures of an isolated converter provided in the prior art;
fig. 2 to fig. 5 are four flowcharts of an operation control method of an isolated converter according to an embodiment of the present invention;
FIG. 6 is a block diagram illustrating a control of fan speed by a rear stage converter according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a control result of a post-stage converter on a fan speed according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The application provides an operation control method of an isolated converter, which is used for realizing the stability of the input electric quantity of a later-stage converter in an upgrading mode.
The isolated converter may, as shown in fig. 1a, specifically include: one pre-stage converter 101, and at least two post-stage converters 102. Wherein, the direct current buses of the rear-stage converters 102 are respectively connected with the output ends of the front-stage converters 101 in a one-to-one correspondence.
When the front-stage converter 101 has multiple outputs and cannot independently control the outputs of the outputs, such as the case of the one-in-multiple-out transformer shown in fig. 1a, it can only obtain the load condition information and the input electric quantity information of each rear-stage converter 102 by communication, and the input electric quantity can be specifically the dc bus voltage (such as V shown in fig. 1a d1 ～V dN ) Then calculating to obtain each DC bus voltage V d1 ～V dN And determining an average control target of each of the subsequent-stage inverters 102 based on each of the load condition information in combination with the electric quantity information capable of characterizing the power supply condition of the input side of the isolated-type inverter; then, according to the deviation between the average value and the average value control target, the driving signal parameters of the average value control target are regulated, so that the closed-loop control of the average value of the voltage of each direct current bus is realized; and transmits the average value control target to each of the subsequent-stage inverters 102 through communication, and the respective subsequent-stage inverters 102 adjust the own dc bus voltage to the average value control target by controlling the own operation.
When the front stage has multiple outputs, but each output can be controlled independently, it can be regarded as multiple isolated conversion outputs, and the structure shown in fig. 1b is that the dc bus voltage V of each rear stage converter 102 d1 ～V dN Control of (3) is completed by each corresponding preceding converter 101; however, each preceding-stage converter 101 still needs to acquire the dc bus voltage and load condition information of its subsequent-stage converter 102 through communication, further, determines the dc bus voltage control target of its subsequent-stage converter 102 by combining the load condition information and the electrical quantity information detected by itself, and then adjusts its own driving signal parameters according to the deviation between the dc bus voltage and the dc bus voltage received by communication, so as to realize closed-loop control on the corresponding dc bus voltage, thereby adapting to the load requirement.
In fig. 1a and 1b, the previous stage converter 101 is an isolated DC/DC converter, and the subsequent stage converter 102 is a DC/AC converter, which is specifically an isolated inverter; in practical applications, in the isolated converter, the front-stage converter 101 may also be a DC/AC converter or an AC/AC converter, the back-stage converter 102 may also be an AC/AC converter or an AC/DC converter, and the front-stage converter 101 is connected to the corresponding back-stage converter 102 through a transformer, as shown in fig. 1c and fig. 1d, so as to realize mutual isolation between the two converters.
Also, regardless of the topology employed, when the number of the subsequent converters 102 is greater than 1, the ac side of each subsequent converter 102 may be cascaded (as shown in fig. 1 a-1 d), in which case the preceding converter 101 will serve as the low-side device of the isolated converter and each subsequent converter 102 of the subsequent stage will serve as the high-side device of the isolated converter. Typically, the preceding stage converter 101 may be an LLC topology, and the following stage converter 102 may be an H-bridge topology, which is only an example and not limited thereto. In practical applications, each of the post-stage converters 102 may be connected in parallel, or independent, depending on the specific application environment, and are all within the scope of the present application. In addition, the arrangements shown in fig. 1a to 1d can also be applied in reverse, in which case the high-side device will be referred to as a pre-inverter and the low-side device will be referred to as a post-inverter, but the above-described communication and control procedures between the two are still required.
That is, the isolated converter includes: at least one front-stage converter 101 and at least one rear-stage converter 102, the rear-stage converter 102 is isolated from the front-stage converter 101 connected with the front-stage converter, and is in communication connection, the input electric quantity information such as direct current bus voltage, current or power of the rear-stage converter 102 can only be acquired by the front-stage converter 101 through communication, and the input electric quantity of the rear-stage converter 102 is controlled by the front-stage converter 101 connected with the rear-stage converter 102.
In addition, in addition to the above topology, two kinds of converters are provided with corresponding control units, respectively, to implement the following operation control method.
The operation control method is shown in fig. 2, and specifically includes:
s101, when the later-stage converter and the earlier-stage converter normally communicate, judging whether a communication borrowing instruction is received or not respectively.
Taking the structure shown in FIG. 1a as an example, each of the subsequent-stage converters will be describedAll in normal communication with the pre-inverter: each subsequent converter respectively inputs electric quantity, such as direct current bus voltage V d1 ～V dN The direct current bus current or the direct current bus power is sent to the front-stage converter; the pre-stage converter obtains an average value according to each input electric quantity, compares the average value with the calculated average value control target to obtain deviation between the average value and the calculated average value control target, adjusts driving signal parameters according to the deviation, and realizes closed-loop control of the average value of each input electric quantity. The average value control target may be related to the load condition information of each subsequent stage converter only, and may be determined after the preceding stage converter receives the load condition information in normal communication, or may be directly determined by each subsequent stage converter and then sent to the preceding stage converter; in practical applications, the average value control target may be related to the power supply condition of the input side of the isolated converter, and the relevant electric quantity information may be directly detected and determined by the previous converter.
The situation shown in fig. 1b to 1d will not be repeated, but the specific control procedure may be summarized as follows: the front-stage converter determines an input electric quantity control target of the rear-stage converter according to the detected self electric quantity information and/or the load condition information obtained by communication, and closed-loop adjusts driving signal parameters of the front-stage converter according to the input electric quantity information transmitted by the rear-stage converter through normal communication; furthermore, under the condition of independent control, the input electric quantity of the corresponding post-stage converter can be kept stable; and in the case of independent control, the average value of the input electric quantity of each corresponding subsequent converter can be kept stable.
In the prior art, if an upper control system sends a communication borrowing instruction, such as an upgrade mode switching instruction, to the isolated converter, it is indicated that a communication bus or a communication channel of wireless power carriers or the like of the isolated converter needs to be occupied by other data, such as upgrade data, for a period of time, at this time, the normal communication cannot be implemented between the converters in the isolated converter, and the front-stage converter cannot receive the input electrical quantity information and the load condition information of each rear-stage converter, so that the stability of each input electrical quantity of the rear stage is affected.
In this embodiment, if a communication borrowing instruction is received, step S102 is executed.
S102, the rear-stage converter and the front-stage converter enter corresponding modes according to the communication borrowing instruction.
When the communication borrowing instruction is an upgrade mode switching instruction, the later-stage converter and the earlier-stage converter enter an upgrade mode respectively.
S103, searching in a corresponding preset relation preset by the front-stage converter according to the working condition information of the isolation-type converter, and determining driving signal parameters corresponding to the working condition information to control the operation of the front-stage converter so as to ensure the stability of the input electric quantity of the rear-stage converter.
At least one memory is arranged in the pre-stage converter, and the control unit of the pre-stage converter can acquire data from the memory even in modes such as upgrading; the memory can store a preset relation in advance, wherein the preset relation is a formula or a table representing the relation between the driving signal parameters and the working condition information, which is obtained by performing linear fitting or artificial intelligence algorithm analysis on the driving signal parameters simulated or actually measured under different working condition information. For example, various working conditions of the isolated converter can be simulated before the isolated converter is put into operation; or in the test operation stage, the data under various working conditions can be actually measured; or, in the normal operation stage, the preset relationship can be updated periodically. Whenever the driving signal parameters in the stable state and the nearby dynamic state are stored in any way, and then appropriate data analysis is performed, so that the corresponding relation between the working condition information and the driving signal parameters can be obtained as the corresponding preset relation. Therefore, after the mode of the pre-stage converter is switched, data can be read from the memory, so that driving signal parameters can be dynamically adjusted according to the working condition information of the isolated converter, such as the electric quantity information of the pre-stage converter obtained by real-time detection and/or the load condition information obtained before the mode is switched, so as to adapt to the working condition under the corresponding mode in real time, and the stability of the electric quantity of each input of the post-stage is maintained.
According to the operation control method of the isolated converter, through the process, under the condition that the input electric quantity information of the later converter cannot be received in time, for example, in an upgrading mode, the driving signal parameters can be adjusted in real time based on the preset relation between the driving signal parameters and the working condition information, so that the stability of the input electric quantity of the later converter is maintained, and further, the damage to circuit components due to the fact that the input electric quantity of the later converter exceeds a design range is avoided, and different operation working condition conditions can be adapted. In addition, under the method, the pre-stage converter can keep power output, so that a control unit in the post-stage converter, which is powered on the input end of the control unit, cannot be powered down to trigger upgrading interruption. In addition, the method belongs to a pure software scheme, and does not need to increase any hardware cost and volume.
On the basis of the above embodiment, the present embodiment provides a specific description for the process of obtaining the preset relationship:
(1) First, the driving signal parameters of the front-stage converter under different working conditions are obtained.
Taking the structure shown in fig. 1a as an example, the control object of the front-stage converter is the input electric quantity of the rear-stage converter, such as the direct current bus voltage, and the driving signal parameters of the front-stage converter are affected by the working condition information; when single variable, such as: different input voltages of the front-stage converter means that the front-stage converter needs to realize the same direct-current bus voltage control target of the rear-stage converter based on different driving signal parameters; and different post-converter loads also means that the pre-converter needs to achieve the same post-converter dc bus voltage control target based on different drive signal parameters.
For example, assuming that the dc bus voltage control target of the subsequent converter is 800V and the system gain is constant, the corresponding driving signal parameters of the previous converter are different in the two cases of 1000V and 1500V for the dc input voltage of the previous converter; moreover, the parameters of the driving signals of the corresponding front-stage converters in the half-load and full-load conditions of the rear-stage converters are also different. When both variables change, the driving signal parameters of the front-stage converter also change correspondingly.
According to different modulation modes, the types of the driving signal parameters which need to be acquired are different in simulation or real time. Typically, when a fm modulation strategy is adopted, a variation range and period of a modulation frequency, that is, a frequency variation speed, range, period, etc. need to be obtained; when the duty cycle modulation strategy is adopted, the variation range and period of the modulation duty cycle, namely the speed, range, period and the like of the duty cycle variation are required to be obtained; when a mixed modulation strategy of frequency modulation and duty cycle modulation is adopted, the variation range and period of the modulation frequency and the variation range and period of the modulation duty cycle need to be acquired.
For example, in order to maintain the dc bus voltage of the post-stage converter to be stable at 800V, under the duty cycle modulation strategy, it is acquired that: when the input voltage of the front-stage converter is 1500V and the back-stage converter runs at idle, the duty cycle needs to be switched between 0% and 30%, and the duration of each duty cycle is 1s; under the frequency modulation strategy, the method comprises the following steps of: the frequency needs to be switched between 0 and 25kHz with the input voltage of the preceding converter at 1500V and the following converter operating idle, each frequency having a duration of 500ms.
(2) And analyzing the relation between the driving signal parameter and the working condition.
Through simulation or actual measurement of various working conditions, driving signal parameters under different working conditions are obtained, then through data analysis methods such as a list, a drawing, an artificial intelligence algorithm and the like, the relation between the driving signal parameters and the working conditions can be obtained, and analysis results are stored into an available memory in an upgrade mode of the front-stage converter in the form of a formula, a table and the like to be used as readable preset relations.
The working condition refers to a specific value of the working condition information; the working condition information can further comprise some information which can be detected in modes such as upgrading on the basis of comprising the input voltage of the front-stage converter and the load of the rear-stage converter, so that the preset relationship can comprise the following relationships: the relation between the direct current input voltage of the front-stage converter and the driving signal parameter, the relation between the direct current input current of the front-stage converter and the driving signal parameter, the relation between the alternating current output current of the front-stage converter and the driving signal parameter and the like; depending on the specific application environment, the method is within the protection scope of the application; that is, the operating condition information includes electrical quantity information of the front-stage converter and load condition information of the rear-stage converter.
In practical application, when the input electric quantity control targets of the later-stage converter are different, for example, under the different direct current bus voltage control targets in fig. 1a, various data values in the preset relationship may also change, so that the corresponding preset relationship can be respectively manufactured under the different input electric quantity control targets; at this time, referring to fig. 3, the operation control method further includes, before the preceding converter searches in the preset corresponding preset relationship, in step S103:
s201, the front-stage converter determines an input electric quantity control target of the rear-stage converter according to the working condition information.
For a preceding-stage converter that cannot independently control the input electric quantity of a subsequent-stage converter connected to the preceding-stage converter, such as the case shown in fig. 1a and 1c, the input electric quantity control target determined in this step is that the preceding-stage converter adjusts the average value control target of the input electric quantity of each subsequent-stage converter before entering a corresponding mode according to the communication borrowing instruction; whereas for a preceding converter, such as the case shown in fig. 1b and 1d, which is capable of independently controlling the input electric quantity of the following converter, the input electric quantity control target determined in this step, i.e., the input electric quantity control target of each of the following converters.
S202, the pre-stage converter determines a preset relation corresponding to an input electric quantity control target.
Of course, in practical application, the corresponding preset relationship may be manufactured without using different input electric quantity control targets, and the input electric quantity control targets are used as one variable in the preset relationship, which only makes the preset relationship relatively complex, but is also within the protection scope of the present application.
On the basis of the above embodiment, after the step S103 is performed once, that is, after the isolated converter enters the upgrade mode or the like, the operation control method may further include the steps as shown in fig. 4 (shown on the basis of fig. 2 as an example):
s104, the later-stage converter and the earlier-stage converter keep slow communication.
In the upgrade mode, when the communication channels such as the communication bus and the like transmit upgrade data, information of input electric quantity (such as direct current bus voltage of each of the rear-stage converters in fig. 1 a) and load condition information transmitted to the front-stage converter by the rear-stage converter can be added after the upgrade data, or an input electric quantity control target transmitted to the rear-stage converter by the front-stage converter can be added, so that slow communication with a communication period longer than that of normal communication is realized. With the configuration shown in fig. 1a, the pre-stage converters may send the input electric quantity control target to each of the post-stage converters based on the slow communication, so that each of the post-stage converters realizes the balance between each of the input electric quantities based on the input electric quantity control target updated slowly.
S105, the front-stage converter protects the input electric quantity of the rear-stage converter according to the updated input electric quantity information of the rear-stage converter in the slow communication.
For example, in the case of fig. 1a, in the modes of upgrading and the like, the pre-stage converter is based on the slowly updated direct current bus voltage of the post-stage converter, so that overvoltage protection on the direct current bus of the post-stage converter is enhanced, and the operation reliability is ensured.
It should be noted that, if the condition information includes load condition information of the later stage converter, step S106 may also be performed after step S104, as shown in fig. 4; in practical applications, after step S104, the method may be executed in one of steps S105 and S106 according to the specific application environment, which are all within the scope of the present application.
S106, the front-stage converter updates the working condition information according to the load condition information of the rear-stage converter updated by the rear-stage converter under the slow communication.
In modes such as upgrading, the pre-stage converter is not necessarily guaranteed to monitor the various working condition information in real time, such as the load condition information of the post-stage converter; that is, each time the step S103 is executed, the electrical quantity information of the previous stage converter may be a real-time value obtained by detection, but the load condition information is not necessarily real-time; therefore, in the upgrade mode and the like, the pre-stage converter can update the working condition information based on the load condition information of the post-stage converter updated slowly, and then the searching of the driving signal parameters can be performed according to the preset relationship closer to the current condition every time through the steps S201 and S202 when the searching of the preset relationship is performed subsequently.
On the basis of the above embodiment, before executing step S102, the operation control method may further include, as shown in fig. 5 (illustrated by way of example on the basis of fig. 2):
s301, the later-stage converter operates according to a preset mode.
That is, the latter converter is still kept for a period of time to realize normal communication with the former converter before entering the upgrade mode, so that the latter converter can also transmit its own input electric quantity (such as each dc bus voltage in fig. 1 a) and receive the input electric quantity control target transmitted by the former converter when operating in the preset mode; therefore, the preset mode may be the same mode as that at the time of normal communication; but is not limited thereto, and specific reference is made to the following.
The step S301 specifically includes:
s401, the output power of the later-stage converter is gradually reduced to a wave-sealing state.
Then, step S402 will be performed for a subsequent stage converter whose input electric quantity can be independently controlled by the preceding stage converter to which it is connected.
S402, controlling the input electric quantity of the later-stage converter to a stable value.
For the subsequent-stage converter whose input electric quantity can be independently controlled by the preceding-stage converter to which it is connected, step S402 is performed, that is, the input electric quantity of the subsequent-stage converter gradually stabilizes to the input electric quantity control target for which it is controlled by the preceding-stage converter to which it is connected.
It should be noted that, in the case where the preceding converter cannot independently control the input electric power of each subsequent converter connected to the preceding converter, taking the structure shown in fig. 1a as an example, ideally, the system has no loss, the outputs of the transformers in the preceding converter and the electric characteristics of each subsequent converter are the same, and the dc bus voltages of each subsequent converter should be balanced. However, there is always a loss in engineering practice, and the output of each path of the transformer and the electrical characteristics of each path of the post-stage converter cannot be completely matched, so that it is necessary to maintain the voltage balance of the dc bus of each path of the post-stage converter by adjusting the driving signal parameters of each path of the post-stage converter. However, in the modes of upgrading and the like, in order to improve the safety of the system, in the prior art, each power device of the post-stage converter is generally in a wave-sealing state, so that the power interaction of each post-stage converter cannot be realized, and therefore, the voltage balance of the direct current bus of each post-stage converter cannot be realized by adjusting the driving signal parameters.
Therefore, after step S401, step S403 will be performed for each of the subsequent-stage converters to which the input electric power cannot be independently controlled by the preceding-stage converter to which it is connected.
S403, controlling the average value of the input electric quantity of each subsequent converter to a stable value, and respectively adjusting the power of the self-carried adjustable load by each subsequent converter based on the average value target of the input electric quantity so as to realize the balance among the respective input electric quantities.
In addition, step S302 is executed while or after the subsequent converter in step S102 enters the corresponding mode according to the communication borrowing instruction, so as to inform the preceding converter to enter the corresponding mode according to the communication borrowing instruction.
S302, the latter converter sends a readiness message to the former converter.
Taking the upgrade of the structure shown in fig. 1a as an example, specifically, after receiving the upgrade mode switching instruction, the front-stage converter needs to wait for receiving the readiness information of the upgrade of the back-stage converter before switching to the upgrade mode, and then step S103 can be executed; when the upgrade mode switching instruction is received, the power of the secondary converter is gradually reduced to be sealed, then the rotating speed of a fan carried by the secondary converter is started and adjusted, so that the input electric quantity of each secondary converter is adjusted to be an average value control target, balance among the secondary converters is realized, the secondary converter is switched to an upgrade mode, and the secondary converter sends the ready information of self upgrade to the primary converter. In the upgrading mode, the pre-stage converter dynamically adjusts the driving signal parameters to adapt to the working condition during upgrading by combining the working condition parameters of the isolation-type converter and the analysis result of the relation between the driving signal parameters and the working condition. When the device just enters the upgrading mode, the targets of the electric quantity input by the rear-stage converter are average value control targets of the electric quantity input by the rear-stage converter before the upgrading mode after the fan is started by the rear-stage converter; in the subsequent stage, the targets of the electric quantity input by the later-stage converter can be controlled to change according to the electric quantity input transmitted under the slow communication.
It should be noted that, the fans and the corresponding fan control systems are not additionally added, but the heat dissipation requirements of the systems are already introduced, so that the fans carried by the post-stage converters are used as their respective adjustable loads, and the rotation speeds of the fans are adjusted to realize the balance between the input electric quantities, so that any increase in hardware cost and system volume is not caused.
Further, taking the configuration shown in fig. 1a as an example, after the subsequent converter is switched to the upgrade mode, the input electrical quantity information of the subsequent converter cannot be transmitted to the previous converter in time, but the input electrical quantity information of the subsequent converter can still be obtained. Therefore, more preferably, after the post-stage converter enters the corresponding mode according to the communication borrowing instruction in step S102, the method further includes:
s501, the later-stage converter adjusts the power of the adjustable load so as to keep balance between the respective input electric quantities.
When this step is executed for the first time, the control targets of the electric quantity input by each subsequent converter for the subsequent converter are as follows: the stable value of the self-input electric quantity during balancing is realized through the step S403, specifically, the stable value of the input electric quantity before switching to the upgrading mode after the post-stage converter starts the fan. In the slow communication state, each subsequent converter converts the control target of the self-input electric quantity into: an input electric quantity control target updated at a slow speed; that is, in the upgrade mode, if the input electric quantity control target of the subsequent stage converter is transferred after the upgrade data is added to the previous stage converter, the balance of the subsequent stage can be slowly adjusted.
The step S501 specifically includes:
(1) If the self input electric quantity is in the preset fluctuation range of the control target, the power of the adjustable load is maintained unchanged.
(2) If the self input electric quantity is smaller than the lower limit value of the preset fluctuation range, the power of the adjustable load is reduced until the power of the adjustable load is zero.
(3) If the self input electric quantity is larger than the upper limit value of the preset fluctuation range, the power of the adjustable load is increased until the power of the adjustable load is a full power value.
Taking the structure shown in fig. 1a as an example, the input electric quantity is taken as a direct current bus voltage, and the logic block diagram shown in fig. 6 may be specifically adopted to implement this step, that is, the direct current bus voltage (hereinafter referred to as self voltage) and the target voltage (that is, the control target of the input electric quantity) are sent to a regulator, and the output of the regulator is the rotational speed signal of the fan.
As shown in fig. 7, when the self voltage is lower than the target voltage (U as shown in fig. 7 n At) a higher value, such as critical powering down the control system (U as shown in FIG. 7 Lo Where) the fan stops; when the self voltage is lower than the target voltage by a certain value (U as shown in FIG. 7 Th2 Where) the fan speed decreases; if the self-voltage is within the preset fluctuation range (U Th2 ，U Th1 ) In, the rotation speed of the fan is kept as R n The method comprises the steps of carrying out a first treatment on the surface of the When the self voltage is higher than the target voltage by a certain value (U as shown in FIG. 7 Th1 Where) the higher the self voltage, the faster the fan speed; when the self voltage reaches a certain set value, such as the protection voltage (U as shown in FIG. 7 ov Where) is located,the fan runs at full speed.
After receiving the instruction of switching to the upgrade mode, the post-stage converter gradually reduces the power to the balance of the input electric quantity after the sealing, that is, the step S403 is also based on the method; at this time, the communication mode has not been switched to correspond to the upgrade mode, taking the structure shown in fig. 1a as an example, the front-stage converter can still obtain all dc bus voltages and load condition information, determine an average value control target, and send the average value control target to each rear-stage converter, and at this stage, the average value of all dc bus voltages can also be adjusted according to the average value control target.
Optionally, the operation control method may further replace S403 with step S601 before the subsequent converter enters the corresponding mode according to the communication borrowing instruction in step S102; in step S102, after the subsequent converter enters the corresponding mode according to the communication borrowing instruction, step S601 may also be used instead of step S501.
S601, adjusting the power of the adjustable load to a full power value.
That is, after the rear-stage converter is switched to the upgrade mode, the fan can be controlled to run at full speed, and the fan load occupies a relatively large total load of the rear-stage converter, so that the loads of all the rear-stage converters are basically consistent, and the direct current buses of all the rear-stage converters in fig. 1a can be automatically equalized.
The operation control method provided by the embodiment not only can ensure the stability of the input electric quantity of the later-stage converter in the upgrading process through the step S103, but also can realize the balance among the input electric quantity of each later-stage converter before and in the upgrading process through the steps S403, S501 and S601.
Another embodiment of the present application further provides an isolated converter, as shown in any one of fig. 1a to 1d, including: at least one preceding converter 101 and at least one succeeding converter 102, the succeeding converters 102 are isolated from each other and communicatively connected to the preceding converter 101 to which they are connected, the input electrical quantity of the succeeding converters 102 can only be acquired by the preceding converters 101 through communication, and the input electrical quantity of the succeeding converters 102 is controlled by the preceding converters 101 to which they are connected. Typically, the preceding stage converter 101 may be an LLC topology, and the following stage converter 102 may be an H-bridge topology, which is only an example and not limited thereto; the subsequent converter 102 may be an isolated device, depending on the specific application environment, and is within the scope of the present application.
When the number of the post-stage converters 102 is greater than 1: the input terminals of the respective post-stage converters 102 respectively receive the output power of different output terminals of the same pre-stage converter 101 (as shown in fig. 1a and 1 c), or respectively receive the output power of the respective corresponding pre-stage converters 101 (as shown in fig. 1b and 1 d); and/or, the output ends of the post-stage converters 102 may be cascaded, or may be connected in parallel or independent, depending on the specific application environment, and are all within the scope of the present application.
In practice, the pre-stage converter may be an isolated DC/DC converter and the post-stage converter may be a DC/AC converter (as shown in fig. 1a and 1 b). Alternatively, the pre-stage converter is a DC/AC converter or an AC/AC converter, and the post-stage converter is an AC/AC converter or an AC/DC converter; and the front-stage converter is connected to the corresponding back-stage converter via a transformer (as shown in fig. 1c and 1 d).
Regardless of the structure, the operation control method according to any one of the embodiments described above can be realized by matching the rear-stage converter 102 with the front-stage converter 101, specifically, matching the control units of the two converters. The specific process and principle of the operation control method are just described in the above embodiments, and are not described in detail herein.
Another embodiment of the present application also provides a power conversion system, including: at least one isolated converter as described in the above embodiments. The structure and principle of the isolated converter can be seen from the previous embodiment, and will not be described in detail herein.
In the power conversion system, when the number of the isolated converters is greater than 1, the input ends of the isolated converters are connected in series or in parallel, and the output ends of the isolated converters are connected in series or in parallel; so as to adapt to corresponding application scenes, and the application scenes are determined according to the specific application environments, and the application scenes are all within the protection scope of the application.
In addition, in the power conversion system, the input end and/or the output end of the isolation type converter can be provided with at least one stage of power converter; that is, other power conversion links may exist, and it is only necessary that one link includes the isolated converter described in the above embodiment, which is within the protection scope of the present application.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The features described in the various embodiments of the present disclosure may be interchanged or combined with one another in the description of the disclosed embodiments to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (19)
1. A method of controlling operation of an isolated converter, the isolated converter comprising: at least one preceding stage converter, and at least one succeeding stage converter; the rear-stage converter is isolated from the front-stage converter connected with the rear-stage converter in a communication way, and the input electric quantity of the rear-stage converter is controlled by the front-stage converter connected with the rear-stage converter; the operation control method comprises the following steps:
when the rear-stage converter and the front-stage converter normally communicate, judging whether a communication borrowing instruction is received or not respectively;
if the communication borrowing instruction is received, the later-stage converter and the earlier-stage converter enter a corresponding mode according to the communication borrowing instruction;
and the front-stage converter searches in a corresponding preset relation preset by the front-stage converter according to the working condition information of the isolation-type converter, and determines driving signal parameters corresponding to the working condition information so as to control the front-stage converter to operate and ensure the stability of the input electric quantity of the rear-stage converter.
2. The operation control method of an isolated converter according to claim 1, wherein the operating condition information includes: electrical quantity information of the preceding converter and/or load condition information of the following converter.
3. The method of claim 1, wherein if the pre-stage converter adopts a fm modulation scheme, the driving signal parameters include: the variation range and period of the modulation frequency;
if the preceding stage converter adopts a duty cycle modulation strategy, the driving signal parameters include: modulating the variation range and period of the duty cycle;
if the pre-stage converter adopts a mixed modulation strategy of frequency modulation and duty cycle modulation, the driving signal parameters include: the variation range and period of the modulation frequency, and the variation range and period of the modulation duty cycle.
4. The operation control method of an isolated converter according to claim 1, wherein the preset relationship is: and carrying out linear fitting or artificial intelligence algorithm analysis on the driving signal parameters simulated or actually measured under different working condition information to obtain a formula or table representing the relation between the driving signal parameters and the working condition information.
5. The operation control method of an isolated converter according to claim 1, wherein the preceding converter further comprises, before searching in a corresponding preset relationship preset by itself:
Determining an input electric quantity control target of the rear-stage converter according to the working condition information;
and determining the preset relation corresponding to the input electric quantity control target.
6. The operation control method of an isolated converter according to claim 1, further comprising, after the preceding converter controls itself to operate:
the back-stage converter is in slow communication with the front-stage converter; the communication period of the slow communication is longer than that of the normal communication;
the front-stage converter protects the input electric quantity of the rear-stage converter according to the updated input electric quantity information of the rear-stage converter under the slow communication; and/or the number of the groups of groups,
and the front-stage converter updates the working condition information according to the load condition information of the rear-stage converter updated by the rear-stage converter under the slow communication.
7. The operation control method of an isolated converter according to any one of claims 1 to 6, wherein before the succeeding converter enters the corresponding mode in accordance with the communication borrowing instruction, further comprising:
the rear-stage converter operates according to a preset mode;
And the back-stage converter also sends a readiness message to the front-stage converter to inform the front-stage converter to enter the corresponding mode according to the communication borrowing instruction at the same time or after entering the corresponding mode according to the communication borrowing instruction.
8. The operation control method of an isolated converter according to claim 7, wherein the post-stage converter operates in a preset mode, comprising:
the latter-stage converter gradually reduces output power to a wave-sealing state;
for the post-stage converter, the input electric quantity of which can be independently controlled by the pre-stage converter to which it is connected, the input electric quantity of which is controlled to a stable value;
for each of the subsequent converters to which the input electric quantity cannot be independently controlled by the preceding converter to which the input electric quantity is connected, the average value of the input electric quantity of each of the subsequent converters is controlled to a stable value, and each of the subsequent converters adjusts the power of an adjustable load carried by itself based on the average value target of the input electric quantity, so as to realize balance between the respective input electric quantities.
9. The operation control method of an isolated converter according to claim 8, wherein for each of said subsequent converters to which an input electric power amount cannot be controlled independently by said preceding converter to which it is connected, after entering a corresponding mode in accordance with said communication borrowing instruction, further comprising:
The power of the adjustable load is adjusted to maintain a balance between the respective amounts of input electrical power.
10. The method of operation control of an isolated converter of claim 9, wherein adjusting the power of the adjustable load to maintain a balance between the respective input electrical quantities comprises:
if the self input electric quantity is within the preset fluctuation range of the control target, maintaining the power of the adjustable load unchanged;
if the self input electric quantity is smaller than the lower limit value of the preset fluctuation range, reducing the power of the adjustable load until the power of the adjustable load is zero;
if the self input electric quantity is larger than the upper limit value of the preset fluctuation range, the power of the adjustable load is increased until the power of the adjustable load is a full power value.
11. The operation control method of an isolated converter according to claim 10, wherein the control target is:
the stable value of the self-input electric quantity is realized when the balance is realized; or alternatively, the process may be performed,
and when the rear-stage converter and the front-stage converter keep slow communication, the input electric quantity transmitted under the slow communication controls the target.
12. An operation control method of an isolated converter according to claim 9, characterized in that the latter converter is full power value for the power regulation of the adjustable load before and/or after entering the corresponding mode according to the communication borrowing instruction.
13. The method of operation control of an isolated converter of claim 8, wherein the adjustable load is a fan; by adjusting the rotational speed of the fan, power adjustment to the adjustable load is achieved.
14. The operation control method of an isolated converter according to any one of claims 1 to 6, wherein a mode in which the succeeding converter and the preceding converter enter in accordance with the communication borrowing instruction is an upgrade mode.
15. An isolated converter, comprising: at least one preceding stage converter, and at least one succeeding stage converter;
the rear-stage converter and the connected front-stage converter are isolated from each other and are in communication connection;
the input electric quantity of the rear-stage converter is controlled by the front-stage converter to which it is connected, and the rear-stage converter cooperates with the front-stage converter to realize the operation control method of the isolated converter according to any one of claims 1 to 14.
16. The isolated converter of claim 15, wherein when the number of the post-stage converters is greater than 1:
the input end of each back-stage converter receives the output electric energy of different output ends of the same front-stage converter respectively, or receives the output electric energy of the corresponding front-stage converter respectively; and/or the number of the groups of groups,
The output ends of the rear-stage converters are cascaded.
17. An isolated converter according to claim 15 or 16, wherein the preceding converter is an isolated DC/DC converter and the following converter is a DC/AC converter; or alternatively, the process may be performed,
the front-stage converter is a DC/AC converter or an AC/AC converter, and the rear-stage converter is an AC/AC converter or an AC/DC converter; and the preceding stage converter is connected with the corresponding succeeding stage converter through a transformer.
18. A power conversion system, comprising: at least one isolated converter according to any of claims 15 to 17.
19. The power conversion system according to claim 18, wherein when the number of the isolated converters is greater than 1, the input ends of the plurality of isolated converters are connected in series or in parallel, and the output ends of the plurality of isolated converters are connected in series or in parallel; and/or the number of the groups of groups,
the input end and/or the output end of the isolation type converter is/are also provided with at least one stage of power converter.
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