Control method and device of converter, converter and storage medium

Abstract

The application is suitable for the technical field of a converter, and provides a control method and device of a converter, the converter and a storage medium. The control method of the converter comprises the following steps: acquiring an actual output power of the converter; determining a target power of each power module according to the actual output power, the number of the power modules and preset output power parameters of the power modules; and controlling each power module to output a corresponding target power. The control method of the converter provided in the application embodiment can reduce the loss of the converter, thereby improving the output efficiency of the converter.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of converters, and particularly relates to a control method and device of a converter, the converter, and a storage medium. BACKGROUND

[0002] With the continuous increase of the proportion of power electronics accessing the power grid, when the converter accesses the power electronic device, there are corresponding electrical losses and thermal losses at each output power point, which affects the output efficiency of the converter. When the converter supplies power to the load, all power modules are usually controlled to evenly distribute the output power, that is, the output power of all power modules is the same. This distribution method will cause the problem of high loss of the converter. SUMMARY

[0003] The control method of the converter provided in the embodiments of the application can solve the problem of high loss of the converter.

[0004] In a first aspect, the embodiments of the application provide a control method of a converter, the converter comprising a plurality of parallel power modules, and the method comprising:

[0005] obtaining an actual output power of the converter;

[0006] determining a target power of each power module according to the actual output power, the number of power modules, and a preset output power parameter of the power module;

[0007] controlling each power module to output a corresponding target power.

[0008] In a possible implementation manner of the first aspect, the target power comprises a first power, a second power, and a third power.

[0009] The controlling each power module to output a corresponding target power comprises:

[0010] controlling a first number of power modules to output the first power, controlling a second number of power modules to output the second power, and controlling a third number of power modules to output the third power.

[0011] The first number, the second number, and the third number are determined according to the actual output power, the number of power modules, the first power, the second power, and the third power.

[0012] In a possible implementation manner of the first aspect, the target power further comprises a fourth power.

[0013] The control each of the power modules to output a respective corresponding target power further includes: controlling a fourth number of the power modules to output the fourth power.

[0014] The first power is a specified output power determined according to the preset output power parameter, the second power is a full load output power of the power module, the third power is zero power, and the fourth number and the fourth power are determined according to the actual output power, the number of the power modules, the first power, the second power and the third power.

[0015] In a possible implementation manner of the first aspect, the method further includes:

[0016] When the actual output power is less than or equal to a first total power, the second number is determined as zero, the first number is determined according to the actual output power and the first power, the fourth number is determined as 1, and the first number and the third number satisfy:

[0017] m+t+1=n

[0018] When the actual output power is greater than the first total power, the second number is determined according to the actual output power, the number of the power modules, the first power and the second power;

[0019] The first number is determined according to the actual output power, the first power, the second power and the second number;

[0020] The fourth number is determined as 1, and the first number, the second number and the third number satisfy:

[0021] m+w+t+1=n

[0022] The first total power is a total power when all the power modules output the first power; m is the first number, w is the second number, t is the third number, and n is the number of the power modules.

[0023] In a possible implementation manner of the first aspect, the method further includes:

[0024] The quotient obtained by dividing the actual output power by the first power is determined as the first number m:

[0025]

[0026] The third number t satisfies:

[0027] t=n-m-1

[0028] The product of the first power and the first number m is taken as a second total power P b *m;

[0029] The difference between the actual output power and the second total power is determined as a fourth power P k :

[0030] P k =P A -P b *m

[0031] Wherein, P A is the actual output power, and P b is the first power.

[0032] In a possible implementation manner of the first aspect, the method further includes:

[0033] The product of the first power and the number n of power modules is taken as the first total power P b *n;

[0034] The difference between the actual output power and the first total power is taken as a first power difference P1:

[0035] P1=P A -P b *n

[0036] The difference between the second power and the first power is taken as a second power difference P2:

[0037] P2=P m -P b ;

[0038] The quotient of the first power difference P1 and the second power difference P2 is rounded up as the second number w;

[0039] The product of the second power and the second number w is taken as a third total power P m *w;

[0040] The difference between the actual output power and the third total power is taken as a third power difference P3:

[0041] P3=P A -P m *w

[0042] The quotient of the third power difference P3 and the first power is the first number m:

[0043]

[0044] The third quantity t satisfies:

[0045] t = n - w - m - 1

[0046] The product of the first power and the first quantity m is taken as a fourth total power P b *m;

[0047] The difference between the actual output power and the fourth total power is taken as a fourth power difference P4:

[0048] P4 = P A -P b *m

[0049] The difference between the fourth power difference P4 and the third total power is determined as the fourth power P k :

[0050] P k = P4 - P m *w

[0051] wherein P A is the actual output power, P b is the first power, and P m is the second power.

[0052] In a possible implementation manner of the first aspect, the method further includes:

[0053] Obtaining power losses corresponding to a plurality of output powers of the power module;

[0054] Associating the plurality of output powers and the respective power losses one by one to obtain preset output power parameters of the power module;

[0055] Storing the preset output power parameters.

[0056] In a second aspect, an embodiment of the present application provides a control device of a converter, including:

[0057] An obtaining module, configured to obtain an actual output power of a converter;

[0058] A target power determining module, configured to determine a target power of each power module according to the actual output power, a quantity of the power modules, and preset output power parameters of the power modules;

[0059] A control module, configured to control each power module to output a respective target power.

[0060] In a third aspect, an embodiment of the present application provides a converter, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, and the processor implements the method in any one of the first aspect when executing the computer program.

[0061] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method in any one of the first aspect.

[0062] Compared with the prior art, the embodiment of the present application has the following beneficial effects:

[0063] In the working process of the converter, the actual output power output by the converter is first acquired, and then the target power of each power module is determined according to the actual output power, the number of power modules, and the preset output power parameters of the power modules. Since each target power is obtained according to the preset output power parameters of the power modules, the power of each power module can be reasonably allocated, so that the sum of the output powers of all the power modules is equal to the actual output power, the power supply demand of the converter to the load is met, and the sum of the losses of all the power modules in the converter is reduced, thereby reducing the overall loss of the converter. When the target power of each power module is determined, each module outputs the corresponding target power, so that the power supply demand to the load is met, and the effect of reducing the loss of the converter is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0065] Figure 1 is a control method flow chart of the converter provided by an embodiment of the present application;

[0066] Figure 2 is an internal structure diagram of the converter provided by an embodiment of the present application;

[0067] Figure 3 is a control method timing chart of the converter provided by an embodiment of the present application;

[0068] Figure 4 is a structure schematic diagram of the control device of the converter provided by an embodiment of the present application;

[0069] Figure 5 is a structure schematic diagram of the converter provided by an embodiment of the present application. Detailed Implementation

[0070] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0071] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0072] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [the described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [the described condition or event] is detected," or "in response to detection of [the described condition or event]."

[0073] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0074] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0075] The converter includes a plurality of parallel power modules, and when the converter supplies power to a load, the load is usually supplied with power by using a power average distribution method. For example, the converter includes five power modules, and when the power of the load is 2000W, the output power of each power module in the converter is 400W; and when the power of the load is 1500W, the output power of each power module in the converter is 300W. This method is simple to control, but causes the converter to have a high loss problem.

[0076] Based on the above problems, the present application provides a control method of a converter. In the working process of the converter, the actual output power of the converter is first obtained, and then the target power of each power module is determined according to the actual output power, the number of power modules and the preset output power parameters of the power modules. Since each target power is obtained according to the preset output power parameters of the power modules, the power of each power module can be reasonably distributed, so that the sum of the output powers of all the power modules is equal to the actual output power, the power supply demand of the converter to the load is met, the sum of the losses of all the power modules in the converter is reduced, and the overall loss of the converter is further reduced. When the target power of each power module is determined, each module outputs the corresponding target power, so that the power supply demand to the load is met, and the effect of reducing the loss of the converter is achieved.

[0077] In order to illustrate the technical solutions described in the present application, specific embodiments are described below.

[0078] Referring to Figure 1 The control method of the converter includes steps S101 to S103.

[0079] In step S101, the actual output power of the converter is obtained.

[0080] Specifically, the current and voltage of the output port of the converter are collected, and then the actual output power of the converter is obtained by multiplying the current and voltage.

[0081] The converter is provided with an alternating current output port (AC port) and a direct current output port (DC port), and when the converter supplies power to a direct current load, the voltage and current of the direct current output port are collected to obtain the actual output power of the converter; and when the converter supplies power to an alternating current load, the voltage and current of the alternating current output port are collected to obtain the actual output power of the converter.

[0082] For example, Figure 2The controller collects the voltage and current of the DC output port at the AC port; the controller collects the voltage and current of the AC output port at the DC port; the controller is connected with each power module through a communication line, for communication control with each power module; each power module is connected with the AC port and the DC port, for collecting the output power of each power module.

[0083] In step S102, the target power of each power module is determined according to the actual output power, the number of power modules and the preset output power parameter of the power module.

[0084] Specifically, since the converter is composed of multiple parallel power modules, the actual output power of the converter is equal to the sum of the output powers of all power modules. The average output power of each power module can be calculated by dividing the actual output power by the number of power modules. On the basis of the average output power, the power of each power module is allocated according to the preset output power parameter of the power module, so that the sum of the output powers of all power modules is equal to the actual output power of the converter, meeting the power supply demand of the converter to the load, while the sum of the losses of all power modules in the converter is reduced, thereby reducing the overall loss of the converter.

[0085] It should be noted that the preset output power parameter of each power module in the converter is the same.

[0086] For example, the preset output power parameter can be the power-loss relationship of the power module, and the required output power value is determined based on the power-loss relationship, for example, the output power value corresponding to the minimum loss of the power module is determined according to the power-loss relationship. The preset output power parameter can also be a given output power, for example, the output power value corresponding to the minimum loss of the power module is given.

[0087] In step S103, each power module outputs the corresponding target power.

[0088] Specifically, after determining the target power of each module, each power module outputs the corresponding target power, and at this time, the power output by each power module is the corresponding target power. The sum of the output powers of all power modules is equal to the actual output power of the converter, which can meet the power supply demand of the converter to the load. At the same time, the sum of the losses of each power module is reduced, which reduces the overall loss of the converter and improves the output efficiency of the converter.

[0089] Step S103 can include step S1031 and step S1032.

[0090] Step S1031, controlling the first number of power modules to output the first power, controlling the second number of power modules to output the second power, and controlling the third number of power modules to output the third power.

[0091] Specifically, according to the actual output power of the converter and the number of power modules, power distribution is performed on each power module in the converter, the first number of power modules is controlled to output the first power, the second number of power modules is controlled to output the second power, and the third number of power modules is controlled to output the third power. Thus, the sum of the output powers of all power modules is the actual output power of the converter, and the sum of the losses of all power modules is reduced, thereby reducing the loss of the converter.

[0092] It should be noted that the first number, the second number, and the third number are determined according to the actual output power, the number of power modules, the first power, the second power, and the third power.

[0093] Step S1032, controlling the first number of power modules to output the first power, controlling the second number of power modules to output the second power, controlling the third number of power modules to output the third power, and controlling the fourth number of power modules to output the fourth power.

[0094] Specifically, according to the actual output power of the converter and the number of power modules, power distribution is performed on each power module in the converter, the first number of power modules is controlled to output the first power, the second number of power modules is controlled to output the second power, the third number of power modules is controlled to output the third power, and the fourth number of power modules is controlled to output the fourth power. Thus, the sum of the output powers of all power modules is the actual output power of the converter, and the sum of the losses of all power modules is reduced, thereby reducing the loss of the converter.

[0095] It should be noted that the first power is a specified output power determined according to a preset output power parameter, the second power is a full-load output power of the power module, the third power is zero power, and the fourth number and the fourth power are determined according to the actual output power, the number of power modules, the first power, the second power, and the third power.

[0096] Illustratively, step S1032 can include step S10321 and step S10322.

[0097] Step S10321, when the actual output power is less than or equal to the first total power, determining that the second number is zero, determining the first number according to the actual output power and the first power, determining that the fourth number is 1, and the first number and the third number satisfy:

[0098] m+t+1=n

[0099] The first total power is a total power when all the power modules output the first power; m is the first quantity, t is the third quantity, and n is the number of power modules.

[0100] Specifically, when the actual output power is less than or equal to the first total power, that is, when all the power modules in the converter output the first power, the actual output power of the converter can be met, and no power module needs to output full load power. Therefore, the second quantity is determined to be zero. When the second quantity is determined to be zero, the first quantity m is determined according to the actual output power and the first power. When the first quantity and the second quantity are both determined, the fourth quantity is determined to be 1, and then the third quantity t is determined. In this way, the power distribution of each power module can be reasonably completed, so that the sum of the output powers of all the power modules is the actual output power of the converter, the power supply demand of the converter to the load is met, and the sum of the losses of all the power modules is reduced, thereby reducing the loss of the converter.

[0101] The quotient obtained by dividing the actual output power by the first power is determined as the first quantity m:

[0102]

[0103] P A is the actual output power, and P b is the first power.

[0104] For example, assuming that the number of power modules in the converter is 6, the second power (full load output power) of the power module is 100 kW, the first power P b (corresponding to the output power at the minimum loss) of the power module is 50 kW, and the actual output power P A of the converter is 240 kW. According to the above information, the sum of the first powers of all the power modules in the converter is 300 kW, which is greater than the actual output power 240 kW of the converter, and no power module needs to output full load power. The second quantity is determined to be zero. Then, the quotient obtained by dividing the actual output power 240 kW by the first power 50 kW is 4, and thus the first quantity m is obtained to be 4.

[0105] The third quantity t satisfies:

[0106] t=n-m-1

[0107] For example, assuming that the number of power modules in the converter is 6, the second power (full load output power) of the power module is 100 kW, the first power P b (corresponding to the output power at the minimum loss) of the power module is 50 kW, and the actual output power P A of the converter is 240 kW. According to the above information, when m is determined, the fourth quantity is determined to be 1, and then the third quantity t is determined. The third quantity t is obtained to be 1.

[0108] The product of the first power and m is taken as the second total power P. b *m; Determine the difference between the actual output power and the second total power, which is the fourth power P. k :

[0109] P k =P A -P b *m

[0110] For example, assuming the converter has 6 power modules, the second power (full-load output power) of the power modules is 100kW, and the first power P of the power modules is... b The output power (at which the loss is minimal) is 50kW, and the actual output power P of the converter is... A The power is 240kW. From the above information, we know that multiplying the first power (50kW) and the first quantity (m) yields the second total power (50kW*4). The difference between the actual output power (240kW) and the second total power (50kW*4) is taken as the fourth power P. k Therefore, the fourth power P is obtained. k =240kW-50kW*4=40kW.

[0111] like Figure 3 As shown, when the actual output power is less than or equal to the first total power, the above control method is adopted, that is, controlling m power modules to output the first power, controlling the (m+1)th power module to output the fourth power, and controlling t power modules to output the third power. This can reasonably complete the power distribution of each power module, so that the sum of the output power of all power modules is the actual output power of the converter, which meets the power supply requirements of the converter to the load, and at the same time reduces the sum of the losses of all power modules, thereby reducing the losses of the converter.

[0112] It should be noted that a power module in hot standby mode means that the power module is outputting zero power.

[0113] Step S10322: When the actual output power is greater than the first total power, determine the second quantity based on the actual output power, the number of power modules, the first power, and the second power.

[0114] The first quantity is determined based on the actual output power, the first power, the second power, and the second quantity.

[0115] If the fourth quantity is 1, then the first, second, and third quantities satisfy the following:

[0116] m+w+t+1=n

[0117] The first total power is the total power when all the power modules output the first power; m is the first quantity, w is the second quantity, t is the third quantity, and n is the number of power modules.

[0118] Specifically, when the actual output power is greater than the first total power, i.e., when all the power modules in the converter output the first power, the actual output power of the converter cannot be met, at this time, some power modules need to output full load power. Therefore, the second quantity w is determined according to the actual output power, the number of power modules, the first power and the second power. When the second quantity is determined, the first quantity m is determined according to the actual output power, the first power, the second power and the second quantity. When the first quantity and the second quantity are both determined, the fourth quantity is determined as 1, and then the third quantity t is determined. In this way, the power distribution of each power module can be reasonably completed, so that the sum of the output powers of all the power modules is the actual output power of the converter, the power supply demand of the converter to the load is met, and the sum of the losses of all the power modules is reduced, thereby reducing the loss of the converter.

[0119] For example, the product of the first power and the number n of power modules is taken as the first total power P b *n; the difference obtained by subtracting the first total power from the actual output power is taken as the first power difference P1:

[0120] P1=P A -P b *n

[0121] P A is the actual output power, and P b is the first power.

[0122] For example, it is assumed that the number n of power modules in the converter is 6, the second power (full load output power) of the power module is 100kW, the first power P b (minimal loss corresponding output power) of the power module is 50kW, and the actual output power P A of the converter is 440kW. According to the above information, the sum of the first powers of all the power modules in the converter (the first total power) is 300kW, which is less than the actual output power 440kW of the converter, i.e., when all the power modules in the converter output the first power, the actual output power of the converter cannot be met, at this time, some power modules need to output full load power. The first total power is obtained by multiplying the first power 50kW and 6, i.e., 50kW*6; the first power difference P1 is obtained by subtracting the first total power 50kW*6 from the actual output power 440kW, i.e., P1=440kW-50kW*6=140kW.

[0123] The difference obtained by subtracting the second power from the first power is taken as the second power difference P2:

[0124] P2 = P m -P b ;

[0125] Among them, P m This is the second power.

[0126] For example, assuming the number of power modules n in the converter is 6, and the second power P of the power module... m (Full-load output power) is 100kW, and the first power P of the power module is... b The output power (at which the loss is minimal) is 50kW, and the actual output power P of the converter is... A The power is 440kW. From the above information, we know that the difference between the second power of 100kW and the first power of 50kW is taken as the second power difference P2. Therefore, the second power difference P2 = 100kW - 60kW = 40kW.

[0127] The quotient obtained by dividing the first power difference by the second power difference is rounded up to be w.

[0128] For example, assuming the number of power modules n in the converter is 6, and the second power P of the power module... m (Full-load output power) is 100kW, and the first power P of the power module is... b The output power (at which the loss is minimal) is 50kW, and the actual output power P of the converter is... A The power output is 440kW. From the above information, we know that the difference between the actual output power of 440kW and the first total power of 300kW is taken as the first power difference of 140kW. Similarly, the difference between the second power of 100kW and the first power of 50kW is taken as the second power difference of 50kW. The quotient of the first power difference of 140kW divided by the second power difference of 50kW is rounded up to obtain the second quantity w. Therefore, the ratio of the first power difference of 140kW to the second power difference of 50kW, rounded up, is 3. Thus, the second quantity w is 3.

[0129] It should be noted that the value of w is the ratio of the first power difference to the second power difference rounded up because of the limitation on the number of power modules. If the quotient of the first power difference and the second power difference is used as the second quantity, the sum of the power of the remaining modules that are all of the first power may not meet the target remaining power. The target remaining power is the difference between the actual output power of the converter and the sum of the power of the power modules that are of the second power.

[0130] For example, if the value of w is the quotient of the first power difference and the second power difference, that is, w takes 2, at this time the number of remaining modules is 4, the sum of the powers of the remaining modules which are all the first power is 4*50kW=200kW, the sum of the powers of the power modules which are the second power is 2*100kW=200kW, the target remaining power is 440kW-200kW=240kW, therefore there is a case that the sum of the powers of the remaining modules which are all the first power cannot meet the target remaining power. Therefore, the quotient obtained by dividing the first power difference by the second power difference is rounded up as w. The power of each power module can be reasonably allocated, so that the sum of the output powers of all the power modules is equal to the actual output power, meeting the power supply demand of the load by the converter, while reducing the sum of the losses of all the power modules in the converter, and further reducing the overall loss of the converter.

[0131] The product of the second power and w is taken as the third total power P m *w; the difference obtained by subtracting the third total power from the actual output power is taken as the third power difference P3:

[0132] P3=P A -P m *w

[0133] For example, assuming that the number n of power modules in the converter is 6, the second power P m (full load output power) of the power module is 100kW, the first power P b (corresponding to the output power at the minimum loss) of the power module is 50kW, and the actual output power P A of the converter is 440kW. From the above information, the product of the second power and w is taken as the third total power 100kW*3; the difference obtained by subtracting the third total power 100kW*3 from the actual output power 440kW is taken as the third power difference P3, and the third power difference P3=440kW-100kW*3=140kW is obtained.

[0134] The quotient obtained by dividing the third power difference P3 by the first power is determined as the first number m:

[0135]

[0136] For example, assuming that the number n of power modules in the converter is 6, the second power P m (full load output power) of the power module is 100kW, the first power P b (corresponding to the output power at the minimum loss) of the power module is 50kW, and the actual output power P A of the converter is 440kW. From the above information, the quotient obtained by dividing the third power difference 140kW by the first power 50kW is 2, and therefore the first number m is 2.

[0137] The third quantity t satisfies:

[0138] t = nwm-1

[0139] For example, suppose the number of power modules n in the converter is 6, the second power (full-load output power) of the power module is 100kW, and the first power P of the power module is... b The output power (at which the loss is minimal) is 50kW, and the actual output power P of the converter is... A The power is 240kW. From the above information, once m and w are determined, the fourth quantity is set to 1, and thus the third quantity t is determined. Therefore, the third quantity t is 0.

[0140] The product of the first power and the first quantity m is taken as the fourth total power P. b *m; The difference between the actual output power and the fourth total power is taken as the fourth power difference P4:

[0141] P4 = P A -P b *m

[0142] For example, assuming the number of power modules n in the converter is 6, and the second power P of the power module... m (Full-load output power) is 100kW, and the first power p of the power module is... b The output power corresponding to the minimum loss is 50kW, and the actual output power P4 of the converter is 440kW. From the above information, we know that multiplying the first power 50kW and 2 gives the fourth total power 50kW*2; subtracting the fourth total power 50kW*2 from the actual output power 440kW gives the fourth power difference P4, resulting in the fourth power difference p4 = 440kW - 50kW*2 = 340kW.

[0143] The difference between the fourth power difference and the third total power is determined as the fourth power P. k :

[0144] P k =P4-P m *w

[0145] For example, assuming the number of power modules n in the converter is 6, and the second power P of the power module... m (Full-load output power) is 100kW, and the first power P of the power module is... b The output power (at which the loss is minimal) is 50kW, and the actual output power P of the converter is... A The power is 440kW. From the above information, we know that the difference obtained by subtracting the third total power of 100kW*3 from the fourth power difference of 340kW is the fourth power P.k , obtaining the fourth power P k = 340kW - 100kW * 3 = 40kW.

[0146] As shown in Figure 3 , when the actual output power is greater than the first total power, the above control method is adopted, that is, the w power modules output the second power, the m power modules output the first power, the (w+m+1) power module outputs the fourth power, and the t power modules output the third power, so that the power distribution of each power module can be reasonably completed, the sum of the output powers of all the power modules is the actual output power of the converter, the power supply demand of the converter to the load is met, and the sum of the losses of all the power modules is reduced, thereby reducing the loss of the converter.

[0147] In an embodiment of the present application, the control method of the converter further includes steps S104, S105 and S106.

[0148] In step S104, the power losses corresponding to the multiple output powers of the power modules are obtained.

[0149] Specifically, each power module in the converter has multiple output powers, and each output power has a corresponding loss.

[0150] In step S105, the multiple output powers and the corresponding power losses are associated one by one to obtain the preset output power parameters of the power modules.

[0151] Specifically, the preset output power parameters of the power modules can be obtained by testing or by consulting the parameter manual of the power modules. The preset output power parameters of the power modules can be a corresponding relationship table of the output power and the loss of the power modules, or a relationship curve. The power modules output different powers, and the losses are different. By querying the corresponding relationship table or the curve of the output power and the loss, the preset output power parameters of the power modules can be obtained.

[0152] In step S106, the preset output power parameters are stored.

[0153] Specifically, after the corresponding relationship between the multiple output powers and the losses of all the power modules is determined, the multiple output powers and the corresponding power losses are associated one by one, and the preset output power parameters of the power modules are stored in the database to complete the creation of the database. When the actual output power of the converter and the number of the power modules in the converter are determined during the operation of the converter, the target power of each power module can be determined in combination with the preset output power parameters of the power modules.

[0154] Referring to Figure 4 , the control device of the converter includes:

[0155] The acquisition module 51 is configured to acquire an actual output power of the converter.

[0156] The target power determination module 52 is configured to determine a target power of each power module according to the actual output power, the number of power modules, and a preset output power parameter of the power module.

[0157] The control module 53 is configured to control each power module to output a respective corresponding target power.

[0158] In an embodiment of the present application, the control module 53 is further configured to:

[0159] control the first number of power modules to output the first power, control the second number of power modules to output the second power, and control the third number of power modules to output the third power.

[0160] The first number, the second number, and the third number are determined according to the actual output power, the number of power modules, the first power, the second power, and the third power.

[0161] In an embodiment of the present application, the control module 53 is further configured to:

[0162] control the fourth number of power modules to output the fourth power.

[0163] The first power is a specified output power determined according to the preset output power parameter, the second power is a full-load output power of the power module, the third power is zero power, and the fourth number and the fourth power are determined according to the actual output power, the number of power modules, the first power, the second power, and the third power.

[0164] In an embodiment of the present application, the control module 53 is further configured to:

[0165] When the actual output power is less than or equal to a first total power, the second number is determined to be zero, the first number is determined according to the actual output power and the first power, the fourth number is determined to be 1, and the first number and the third number satisfy:

[0166] m+t+1=n

[0167] When the actual output power is greater than the first total power, the second number is determined according to the actual output power, the number of power modules, the first power, and the second power.

[0168] determining the first quantity according to the actual output power, the first power, the second power and the second quantity;

[0169] determining the fourth quantity as 1, and the first quantity, the second quantity and the third quantity satisfying:

[0170] m+w+t+1=n

[0171] wherein the first total power is a total power when all the power modules output the first power; m is the first quantity, w is the second quantity, t is the third quantity, and n is the quantity of the power modules.

[0172] In one embodiment of the present application, the control module 53 is further configured to:

[0173] determining the first quantity m as a quotient of the actual output power divided by the first power:

[0174]

[0175] the third quantity t satisfying:

[0176] t=n-m-1

[0177] multiplying the first power and the first quantity m to obtain a second total power P b *m;

[0178] determining a difference of the actual output power minus the second total power as the fourth power P k :

[0179] P k =P A -P b *m

[0180] wherein P A is the actual output power, and p b is the first power.

[0181] In one embodiment of the present application, the control module 53 is further configured to:

[0182] multiplying the first power and the quantity n of the power modules to obtain the first total power p b *n;

[0183] determining a difference of the actual output power minus the first total power as a first power difference P1:

[0184] P1=P A -P b *n

[0185] The difference between the second power and the first power is taken as the second power difference P2:

[0186] P2 = P m -P b ;

[0187] The quotient obtained by dividing the first power difference P1 by the second power difference P2 is rounded up to obtain the second quantity w;

[0188] The product of the second power and the second quantity w is taken as the third total power P. m *w;

[0189] The difference between the actual output power and the third total power is taken as the third power difference P3:

[0190] P3 = P A -P m *w

[0191] The quotient obtained by dividing the third power difference P3 by the first power is determined as the first quantity m:

[0192]

[0193] The third quantity t satisfies:

[0194] t = nwm-1

[0195] The product of the first power and the first quantity m is taken as the fourth total power P. b *m;

[0196] The difference between the actual output power and the fourth total power is taken as the fourth power difference P4:

[0197] P4 = P A -P b *m

[0198] The difference between the fourth power difference P4 and the third total power is determined as the fourth power p. k :

[0199] P k =P4-P m *w

[0200] Among them, P A P is the actual output power. b For the first power, P m This is the second power.

[0201] In one embodiment of this application, the control device for the converter further includes:

[0202] A loss acquisition module is used to acquire the power loss corresponding to multiple output powers of the power module.

[0203] The association module is used to associate multiple output powers and their corresponding power losses one by one to obtain the preset output power parameters of the power module.

[0204] The storage module stores the preset output power parameters.

[0205] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0206] like Figure 5 As shown, the converter 6 in this embodiment may include: at least one processor 60 ( Figure 5 Only one processor 60, a memory 61, and a computer program 62 stored in the memory 61 and executable on the at least one processor 60 are shown. When the processor 60 executes the computer program 62, it implements the steps in any of the above method embodiments, for example... Figure 1 Steps S101 to S103 in the illustrated embodiment. Alternatively, when the processor 60 executes the computer program 62, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 4 The functions of modules 51 to 53 are shown.

[0207] For example, the computer program 62 can be divided into one or more modules / units, which are stored in the memory 61 and executed by the processor 60 to complete the present invention. The one or more modules / units can be a series of computer program 62 instruction segments capable of performing specific functions, which describe the execution process of the computer program 62 in the converter 6.

[0208] The processor 60 can be a central processing unit (CPU), and can also be other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0209] The memory 61 can be an internal storage unit of the current transformer 6 in some embodiments, for example, a hard disk or a memory of the current transformer 6. The memory 61 can also be an external storage device of the current transformer 6 in other embodiments, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory 61 can include both the internal storage unit and the external storage device of the current transformer 6. The memory 61 is used to store an operating system, an application program, a boot loader, data, and other programs, for example, program codes of the computer program 62, etc. The memory 61 can also be used to temporarily store data that has been output or will be output.

[0210] The embodiments of the present application further provide a computer readable storage medium, which stores the computer program 62. The computer program 62 is executed by the processor 60, and steps in each of the above method embodiments can be implemented.

[0211] The embodiments of the present application provide a computer program product. When the computer program product is run on a mobile terminal, the mobile terminal executes steps in each of the above method embodiments.

[0212] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the computer program 62 can be used to instruct the related hardware to complete all or part of the processes in the above-mentioned embodiments. The computer program 62 can be stored in a computer readable storage medium, and the computer program 62 can implement the steps of each method embodiment described above when executed by the processor 60. The computer program 62 includes computer program code, which can be in the form of source code, object code, executable files or some intermediate forms. The computer readable medium at least includes any entity or device capable of carrying the computer program code to the terminal device, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium. For example, U disk, mobile hard disk, magnetic disk or optical disk, etc. In some jurisdictions, according to legislation and patent practice, the computer readable medium can not be an electrical carrier signal and a telecommunication signal.

[0213] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0214] Those skilled in the art can appreciate that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0215] In the embodiments provided in the present application, it should be understood that the disclosed apparatus / network device and method can be implemented in other ways. For example, the apparatus / network device embodiments described above are only schematic. The division of the modules or units is only a logical function division, and there can be another division in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0216] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may also be distributed to multiple network units. Part or all of the units can be selected to achieve the purpose of the embodiment scheme according to actual needs.

[0217] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A control method of a converter including a plurality of power modules connected in parallel, characterized by, The method comprises: acquiring an actual output power of the converter; determining a target power of each power module according to the actual output power, the number of power modules, and preset output power parameters of the power modules; controlling each power module to output a respective corresponding target power; the target power comprises a first power, a second power, a third power, and a fourth power; the controlling each power module to output a respective corresponding target power comprises: controlling a first number of the power modules to output the first power, controlling a second number of the power modules to output the second power, controlling a third number of the power modules to output the third power, and controlling a fourth number of the power modules to output the fourth power; wherein the first power is an output power value corresponding to a minimum loss of a given power module, the second power is a full-load output power of the power module, the third power is zero power, and the first number, the second number, the third number, the fourth number, and the fourth power are determined according to the actual output power, the number of power modules, the first power, the second power, and the third power; the method further comprises: when the actual output power is less than or equal to a first total power, determining that the second number is zero, determining the first number according to the actual output power and the first power, and determining that the fourth number is 1, the first number and the third number satisfying: when the actual output power is greater than the first total power, determining the second number according to the actual output power, the number of power modules, the first power, and the second power; determining the first number according to the actual output power, the first power, the second power, and the second number; determining that the fourth number is 1, and the first number, the second number, and the third number satisfying: The first total power is a total power when all the power modules output the first power. The first number is the number of the power modules, The second number is the number of the power modules, The third number is the number of the power modules, The number is the number of the power modules. the method further comprises: when the actual output power is greater than the first total power, multiplying the first power and the number of power modules as the first total power ; subtracting the first total power from the actual output power to obtain a first power difference : subtracting the first power from the second power to obtain a difference : ； determining the first power difference dividing the second power difference the resulting quotient is rounded up to the second number ; a product of the second power and the second number as a third total power ​ subtracting the third total power from the actual output power to obtain a third power difference : determining the third power difference value a quotient of the first power is the first quantity : the third number satisfies: a product of the first power and the first number as a fourth total power ​ subtracting the fourth total power from the actual output power to obtain a difference value as a fourth power difference value : determining the fourth power difference subtracting the third total power to obtain a difference as the fourth power : wherein, is the actual output power, is the first power, is the second power.

2. The control method of the converter according to claim 1, characterized by, the method further comprises: determining a quotient of the actual output power divided by the first power as the first quantity : the third number satisfies: a product of the first power and the first number as a second total power ​ determining a difference between the actual output power and the second total power as the fourth power : wherein, is the actual output power, is the first power.

3. The control method of the converter according to claim 1 or 2, characterized by, the method further comprises: acquiring power losses corresponding to a plurality of output powers of the power module; associating the plurality of output powers and the respective corresponding power losses one by one to obtain preset output power parameters of the power module; storing the preset output power parameters.

4. A control device of a converter, characterized by comprising: comprises: an acquiring module, configured to acquire an actual output power of a converter; a target power determining module, configured to determine a target power of each power module according to the actual output power, the number of power modules, and preset output power parameters of the power modules; a control module, configured to control each power module to output a respective corresponding target power; the target power comprises a first power, a second power, a third power, and a fourth power; the controlling each power module to output a respective corresponding target power comprises: controlling a first number of the power modules to output the first power, controlling a second number of the power modules to output the second power, controlling a third number of the power modules to output the third power, and controlling a fourth number of the power modules to output the fourth power; The first power is an output power value corresponding to minimum loss of a given power module, the second power is full load output power of the power module, the third power is zero power, the first quantity, the second quantity, the third quantity, the fourth quantity and the fourth power are determined according to the actual output power, the number of power modules, the first power, the second power and the third power. When the actual output power is less than or equal to the first total power, the second quantity is determined as zero, the first quantity is determined according to the actual output power and the first power, the fourth quantity is determined as 1, and the first quantity and the third quantity satisfy: When the actual output power is greater than the first total power, the second quantity is determined according to the actual output power, the number of power modules, the first power and the second power. The first quantity is determined according to the actual output power, the first power, the second power and the second quantity. The fourth quantity is determined as 1, and the first quantity, the second quantity and the third quantity satisfy: The first total power is a total power when all the power modules output the first power. The first number is the number of the power modules, The second number is the number of the power modules, The third number is the number of the power modules, The number is the number of the power modules. when the actual output power is greater than the first total power, multiplying the first power and the number of power modules as the first total power ; subtracting the first total power from the actual output power to obtain a first power difference : subtracting the first power from the second power to obtain a difference : ； determining the first power difference dividing the second power difference the resulting quotient is rounded up to the second number ; a product of the second power and the second number as a third total power ​ subtracting the third total power from the actual output power to obtain a third power difference : determining the third power difference value a quotient of the first power is the first quantity : the third number satisfies: a product of the first power and the first number as a fourth total power ​ subtracting the fourth total power from the actual output power to obtain a difference value as a fourth power difference value : determining the fourth power difference subtracting the third total power to obtain a difference as the fourth power : wherein, is the actual output power, is the first power, is the second power.

5. A power converter comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, characterized in that, The processor executes the computer program to implement the method of any one of claims 1-3.

6. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 5. The computer program is executed by the processor to implement the method of any one of claims 1-3.

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