CN117318475B - Energy storage converter, control method and device thereof and readable storage medium - Google Patents

Energy storage converter, control method and device thereof and readable storage medium Download PDF

Info

Publication number
CN117318475B
CN117318475B CN202311574597.6A CN202311574597A CN117318475B CN 117318475 B CN117318475 B CN 117318475B CN 202311574597 A CN202311574597 A CN 202311574597A CN 117318475 B CN117318475 B CN 117318475B
Authority
CN
China
Prior art keywords
capacitor
semiconductor device
voltage value
energy storage
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202311574597.6A
Other languages
Chinese (zh)
Other versions
CN117318475A (en
Inventor
王世恩
官二勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jingqing Digital Beijing Technology Co ltd
Original Assignee
Jingqing Digital Beijing Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jingqing Digital Beijing Technology Co ltd filed Critical Jingqing Digital Beijing Technology Co ltd
Priority to CN202311574597.6A priority Critical patent/CN117318475B/en
Publication of CN117318475A publication Critical patent/CN117318475A/en
Application granted granted Critical
Publication of CN117318475B publication Critical patent/CN117318475B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to the technical field of power electronics, and provides an energy storage converter, a control method and device thereof and a readable storage medium. The energy storage converter includes: the direct-current converter module further comprises a first semiconductor component, an inductance component, a fourth capacitor and a midpoint balance branch, wherein the first semiconductor component is used for adjusting the voltage value of the fourth capacitor so that the voltage value of the fourth capacitor is larger than a first preset value and smaller than a second preset value; the first semiconductor component is also used for adjusting the voltage value of the third capacitor so that the voltage value of the third capacitor is a third preset value. The midpoint balance branch is used for adjusting the voltage value of the first capacitor and the voltage value of the second capacitor so that the voltage value of the first capacitor and the voltage value of the second capacitor are fourth preset values.

Description

Energy storage converter, control method and device thereof and readable storage medium
Technical Field
The invention relates to the technical field of power electronics, in particular to an energy storage converter, a control method and device thereof and a readable storage medium.
Background
In the related art, the energy storage converter generally adopts a two-stage structure. The first stage is a DC-DC converter module (DC-DC converter for short), one side of which is connected with a battery, and the other side is connected with a bus capacitor, so as to provide a stable DC voltage value. The second stage is a direct current-alternating current converter module (DC-AC converter for short), one side of which is connected with a bus capacitor, and the other side is connected with a power grid or a load. However, although the dc converter module in the energy storage converter has a bidirectional boost function, when the difference between the battery voltage value and the bus voltage value is large, the efficiency of the energy storage converter is low due to the large current ripple on the dc inductor.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
To this end, a first aspect of the invention is directed to an energy storage converter.
A second aspect of the present invention is to provide a control method of an energy storage converter.
A third aspect of the present invention is to provide a control device for an energy storage converter.
A fourth aspect of the present invention is to provide another control device for an energy storage converter.
A fifth aspect of the present invention is directed to a readable storage medium.
In view of this, according to a first aspect of the present invention, there is provided an energy storage converter for converting a direct current power source into an alternating current power source, the energy storage converter comprising:
the first port and the second port are used for being connected with a first direct current power supply;
the direct current converter module comprises a first capacitor and a second capacitor, one end of the first capacitor is connected with the first port, the other end of the first capacitor is connected with one end of the second capacitor, and the other end of the second capacitor is connected with the second port;
the direct current converter module further comprises a first semiconductor assembly, wherein the first semiconductor assembly comprises a first semiconductor device, a second semiconductor device, a third semiconductor device and a fourth semiconductor device, a first end of the first semiconductor device is connected with the first capacitor, a second end of the first semiconductor device is connected with a first end of the second semiconductor device, a second end of the second semiconductor device is connected with a first end of the third semiconductor device, a second end of the third semiconductor device is connected with a first end of the fourth semiconductor device, and a second end of the fourth semiconductor device is connected with the second capacitor;
The direct current converter module further comprises a third capacitor, one end of the third capacitor is connected with the second end of the first semiconductor device, and the other end of the third capacitor is connected with the second end of the third semiconductor device;
an inductance assembly, one end of which is connected with the second end of the second semiconductor device;
one end of the fourth capacitor is connected with the other end of the inductance component, and the other end of the fourth capacitor is connected with the second port;
the direct current converter module further comprises a midpoint balance branch, wherein a first end of the midpoint balance branch is connected with the other end of the first capacitor, a second end of the midpoint balance branch is connected with one end of the third capacitor, and a third end of the midpoint balance branch is connected with the other end of the third capacitor;
the alternating current converter module is used for converting direct current output by the direct current converter module into alternating current;
the first semiconductor component is used for adjusting the voltage value of the fourth capacitor so that the voltage value of the fourth capacitor is larger than a first preset value and smaller than a second preset value;
The first semiconductor component is also used for adjusting the voltage value of the third capacitor so that the voltage value of the third capacitor is a third preset value;
the midpoint balance branch is used for adjusting the voltage value of the first capacitor and the voltage value of the second capacitor so that the voltage value of the first capacitor and the voltage value of the second capacitor are fourth preset values.
According to the energy storage converter in the technical scheme, through the arrangement of the direct current converter module, the voltage value of the fourth capacitor can be regulated in the operation process of occasions with high direct current voltage value and low alternating current voltage value, so that the voltage value of the fourth capacitor is kept between the first preset value and the second preset value, the current ripple of the inductance component is enabled to be minimum, and the efficiency reduction of the energy storage converter caused by the fact that the current ripple of the inductance component is large is avoided. And meanwhile, the voltage values of the first capacitor and the second capacitor are adjusted to be fourth preset values through the midpoint balance branch, so that the running stability of the energy storage converter is ensured.
According to a second aspect of the present invention, there is provided a control method of an energy storage converter, the energy storage converter being the energy storage converter defined in the first aspect, the energy storage converter being connected to a first direct current power supply, the control method of the energy storage converter comprising:
Determining a first preset value according to a target output voltage value of the energy storage converter;
determining a second preset value according to the operation parameters of the alternating current converter module;
the first semiconductor component is controlled so that the voltage value of the fourth capacitor is larger than the first preset value and smaller than the second preset value.
According to the control method of the energy storage converter in the technical scheme, the direct current converter module is controlled, so that the voltage value of the fourth capacitor can be regulated in the operation process of occasions with high direct current voltage value and low alternating current voltage value, the voltage value of the fourth capacitor is kept between the first preset value and the second preset value, the current ripple of the inductance component is enabled to be minimum, and the efficiency reduction of the energy storage converter caused by the fact that the current ripple of the inductance component is large is avoided.
According to a third aspect of the present invention, there is provided a control device for an energy storage converter, the energy storage converter being as defined in the first aspect, the energy storage converter being connected to a first direct current power supply, the control device for an energy storage converter comprising:
the acquisition module is used for determining a first preset value according to a target output voltage value of the energy storage converter; and
determining a second preset value according to the operation parameters of the alternating current converter module;
The control module is used for controlling the first semiconductor component so that the voltage value of the fourth capacitor is larger than a first preset value and smaller than a second preset value.
According to the control device of the energy storage converter in the technical scheme, the direct current converter module is controlled, and the voltage value of the fourth capacitor can be adjusted in the operation process of occasions with high direct current voltage value and low alternating current voltage value, so that the voltage value of the fourth capacitor is kept between the first preset value and the second preset value, the current ripple of the inductance component is enabled to be minimum, and the efficiency reduction of the energy storage converter caused by the fact that the current ripple of the inductance component is large is avoided.
According to a fourth aspect of the present invention, there is provided a control device for an energy storage converter, including a processor and a memory, wherein a program or an instruction is stored in the memory, and the program or the instruction when executed by the processor implements the steps of the control method for an energy storage converter according to any of the above-mentioned aspects. Therefore, the control device of the energy storage converter has all the beneficial effects of the control method of the energy storage converter in any one of the above technical schemes, and will not be described herein.
According to a fifth aspect of the present invention, a readable storage medium is provided, on which a program or instructions is stored, which when executed by a processor, implements a method for controlling an energy storage converter according to any of the above-mentioned aspects. Therefore, the readable storage medium has all the advantages of the control method of the energy storage converter in any of the above technical solutions, and will not be described herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 shows one of the circuit schematic diagrams of an energy storage converter in an embodiment of the invention;
FIG. 2 shows a second schematic circuit diagram of an energy storage converter in an embodiment of the invention;
fig. 3 shows one of the flow charts of the control method of the energy storage converter in the embodiment of the invention;
fig. 4 shows a second flow chart of a control method of the energy storage converter according to the embodiment of the invention;
fig. 5 shows a third flow chart of a control method of the energy storage converter according to the embodiment of the invention;
fig. 6 shows a fourth flow chart of a control method of an energy storage converter in an embodiment of the invention;
fig. 7 shows one of waveform diagrams of a control method of the energy storage converter in the embodiment of the present invention;
fig. 8 shows a second waveform diagram of a control method of the energy storage converter according to the embodiment of the invention;
fig. 9 shows a third waveform diagram of a control method of the energy storage converter in the embodiment of the invention;
Figure 10 shows one of the closed loop control flow diagrams of the energy storage converter in an embodiment of the invention;
fig. 11 shows a fifth flow chart of a control method of an energy storage converter in an embodiment of the invention;
FIG. 12 illustrates a second closed loop control flow chart of an energy storage converter in an embodiment of the invention;
fig. 13 shows a flowchart of a control method of an energy storage converter in an embodiment of the invention;
fig. 14 shows a seventh flow chart of a control method of the energy storage converter in the embodiment of the invention;
fig. 15 shows one of the block diagrams of the control device of the energy storage converter in the embodiment of the present invention;
fig. 16 shows a second block diagram of a control device for an energy storage converter in an embodiment of the invention;
the correspondence between the reference numerals and the component names in fig. 1 and 2 is:
100 energy storage converter, 101 first port, 102 second port, 103 dc converter module, 104 first dc power supply, 105 first capacitor, 106 second capacitor, 107 first semiconductor component, 1071 first semiconductor device, 1072 second semiconductor device, 1073 third semiconductor device, 1074 fourth semiconductor device, 108 third capacitor, 109 inductor component, 110 fourth capacitor, 111 ac converter module, 112 branch resistor, 114 branch switch, 116 fifth semiconductor device, 118 sixth semiconductor device, 120 neutral balance branch.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and the scope of the invention is therefore not limited to the specific embodiments disclosed below.
The energy storage converter, the control method, the device and the readable storage medium thereof provided in the embodiments of the present application are described in detail below with reference to fig. 1 to 16 through specific embodiments and application scenarios thereof.
As shown in fig. 1, in an embodiment of the present invention, an energy storage converter 100 is provided for converting a dc power source into an ac power source, where the energy storage converter 100 includes:
a first port 101 and a second port 102 for connection to a first direct current power supply 104;
the direct current converter module 103 comprises a first capacitor 105 and a second capacitor 106, one end of the first capacitor 105 is connected with the first port 101, the other end of the first capacitor 105 is connected with one end of the second capacitor 106, and the other end of the second capacitor 106 is connected with the second port 102;
The dc converter module 103 further includes a first semiconductor assembly 107, where the first semiconductor assembly 107 includes a first semiconductor device 1071, a second semiconductor device 1072, a third semiconductor device 1073, and a fourth semiconductor device 1074, a first end of the first semiconductor device 1071 is connected to the first capacitor 105, a second end of the first semiconductor device 1071 is connected to a first end of the second semiconductor device 1072, a second end of the second semiconductor device 1072 is connected to a first end of the third semiconductor device 1073, a second end of the third semiconductor device 1073 is connected to a first end of the fourth semiconductor device 1074, and a second end of the fourth semiconductor device 1074 is connected to the second capacitor 106;
the dc converter module 103 further includes a third capacitor 108, one end of the third capacitor 108 is connected to the second end of the first semiconductor device 1071, and the other end of the third capacitor 108 is connected to the second end of the third semiconductor device 1073;
the dc converter module 103 further comprises an inductance assembly 109, one end of the inductance assembly 109 being connected to the second end of the second semiconductor device 1072;
the dc converter module 103 further includes a fourth capacitor 110, one end of the fourth capacitor 110 is connected to the other end of the inductance component 109, and the other end of the fourth capacitor 110 is connected to the second port 102;
The dc converter module 103 further includes a midpoint balance branch 120, a first end of the midpoint balance branch 120 is connected to the other end of the first capacitor 105, a second end of the midpoint balance branch 120 is connected to one end of the third capacitor 108, and a third end of the midpoint balance branch 120 is connected to the other end of the third capacitor 108;
the energy storage converter 100 further comprises an ac converter module 111, one end of the ac converter module 111 is connected to the other end of the inductance component 109, the other end of the ac converter module is connected to the second port 102, and the ac converter module is configured to convert dc power output by the dc converter module into ac power;
the first semiconductor component 107 is configured to adjust a voltage value of the fourth capacitor 110 so that the voltage value of the fourth capacitor 110 is greater than a first preset value and less than a second preset value;
the first semiconductor component 107 is further configured to adjust a voltage value of the third capacitor 108 so that the voltage value of the third capacitor 108 is a third preset value;
the midpoint balancing branch 120 is configured to adjust the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106 so that the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106 are a fourth preset value.
In this embodiment, an energy storage converter 100 is provided for converting an input first dc power source 104 into an ac power source for output, where the first dc power source 104 is a power source for providing dc power.
The energy storage converter 100 comprises a first port 101 and a second port 102 for connection to a first direct current power supply 104.
For example, the first port 101 may be connected to the positive electrode of the first direct current power supply 104, and the second port 102 may be connected to the negative electrode of the first direct current power supply 104.
The energy storage converter 100 further comprises a direct current converter module 103, and comprises a first capacitor 105 and a second capacitor 106, wherein one end of the first capacitor 105 is connected with the first port 101, the other end of the first capacitor 105 is connected with one end of the second capacitor 106, and the other end of the second capacitor 106 is connected with the second port 102; the first capacitor 105 and the second capacitor 106 are voltage stabilizing capacitors for balancing the voltage values of the energy storage converter 100.
The dc converter module 103 further includes a first semiconductor assembly 107, where the first semiconductor assembly 107 includes a first semiconductor device 1071, a second semiconductor device 1072, a third semiconductor device 1073, and a fourth semiconductor device 1074, the first end of the first semiconductor device 1071 is connected to the first capacitor 105, the second end of the first semiconductor device 1071 is connected to the first end of the second semiconductor device 1072, the second end of the second semiconductor device 1072 is connected to the first end of the third semiconductor device 1073, the second end of the third semiconductor device 1073 is connected to the first end of the fourth semiconductor device 1074, and the second end of the fourth semiconductor device 1074 is connected to the second capacitor 106.
The first semiconductor device 1071, the second semiconductor device 1072, the third semiconductor device 1073, and the fourth semiconductor device 1074 are specifically devices of semiconductor characteristics.
Illustratively, the first, second, third and fourth semiconductor devices 1071, 1072, 1073, 1074 may include IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistors).
It should be noted that, the first semiconductor component 107 is a device capable of controlling on/off, and the state switching duration of the first semiconductor component 107 is faster, so as to ensure the state switching speed of the energy storage converter 100.
The state switching duration of the first semiconductor component 107 may be specifically 5ms to 10ms, for example.
The dc converter module 103 further includes a third capacitor 108, one end of the third capacitor 108 is connected to the second end of the first semiconductor device 1071, and the other end of the third capacitor 108 is connected to the second end of the third semiconductor device 1073; the third capacitor 108 is a voltage stabilizing capacitor, and is used for balancing the voltage value of the energy storage converter 100.
Illustratively, the third capacitance 108 may balance the voltage values of the energy storage converter 100 with the first capacitance 105 and the second capacitance 106.
The dc converter module 103 further comprises an inductance assembly 109, one end of the inductance assembly 109 being connected to the second end of the second semiconductor device 1072 for storing the electrical energy of the first dc power supply 104.
The dc converter module 103 further includes a fourth capacitor 110, one end of the fourth capacitor 110 is connected to the other end of the inductance component 109, and the other end of the fourth capacitor 110 is connected to the second port 102.
The energy storage converter 100 further includes an ac converter module 111, where one end of the ac converter module 111 is connected to the other end of the inductance assembly 109, and the other end of the ac converter module is connected to the second port 102, and the ac converter module is configured to convert dc power output by the dc converter module into ac power. The ac converter module 111 is configured to convert the dc power output from the dc converter module 103 into ac power and output the ac power.
The ac converter module 111 may be an H-bridge circuit, an NPC circuit, or an ANPC circuit, for example.
It should be noted that, the first semiconductor component 107 is configured to adjust the voltage value of the fourth capacitor 110, so that the voltage value of the fourth capacitor 110 is greater than the first preset value and less than the second preset value; and further, the current ripple of the inductance assembly 109 is minimized, so that the efficiency of the energy storage converter 100 is prevented from being reduced due to the fact that the current ripple of the inductance assembly 109 is large.
Further, the first semiconductor component 107 is further configured to adjust a voltage value of the third capacitor 108, so that the voltage value of the third capacitor 108 is a third preset value, and stability of the voltage value in the current transmission process in the operation process of the energy storage capacitor is further ensured.
Further, the midpoint balancing branch 120 is configured to adjust the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106, so that the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106 are a fourth preset value. To ensure stable operation of the energy storage converter 100.
Through the arrangement of the dc converter module, the energy storage converter 100 in this embodiment can adjust the voltage value of the fourth capacitor 110 in the operation process of the high dc voltage value and the low ac voltage value, so that the voltage value of the fourth capacitor 110 is kept between the first preset value and the second preset value, and further the current ripple of the inductance component 109 is minimized, so as to avoid the efficiency reduction of the energy storage converter 100 caused by the larger current ripple of the inductance component 109. Meanwhile, the voltage values of the first capacitor 105 and the second capacitor 106 are adjusted to be fourth preset values through the midpoint balance branch 120, so that the operation stability of the energy storage converter 100 is ensured.
In some embodiments, optionally, an energy storage converter 100 is provided, where a half of the voltage value of the first direct current power supply 104 is smaller than a first preset value, controlling the first semiconductor component 107 to operate in the first mode so that the voltage value of the fourth capacitor 110 is greater than the first preset value;
in the first mode, the duty cycle of the first semiconductor device 1071 and the second semiconductor device 1072 is greater than 0.5, and the duty cycle of the third semiconductor device 1073 and the fourth semiconductor device 1074 is less than 0.5;
in the case that one half of the voltage value of the first dc power supply 104 is greater than the second preset value, controlling the first semiconductor device 107 to operate in the second mode so that the voltage value of the fourth capacitor 110 is less than the second preset value;
in the second mode, the duty cycle of the first semiconductor device 1071 and the second semiconductor device 1072 is less than 0.5, and the duty cycle of the third semiconductor device 1073 and the fourth semiconductor device 1074 is greater than 0.5;
in the case that one half of the voltage value of the first dc power supply 104 is greater than the first preset value and less than the second preset value, controlling the first semiconductor device 107 to operate in the third mode so that the voltage value of the fourth capacitor 110 is greater than the first preset value and less than the second preset value;
In the third mode, the duty ratio of the first semiconductor device 1071, the second semiconductor device 1072, the third semiconductor device 1073, and the fourth semiconductor device 1074 is 0.5.
In this embodiment, in the case that one half of the voltage value of the first dc power supply 104 is smaller than the first preset value, the first semiconductor device 107 is controlled to operate in the first mode so that the voltage value of the fourth capacitor 110 is greater than the first preset value.
Specifically, in the first mode, the duty ratio of the first semiconductor device 1071 and the second semiconductor device 1072 is greater than 0.5, and the duty ratio of the third semiconductor device 1073 and the fourth semiconductor device 1074 is less than 0.5.
In the case that one half of the voltage value of the first dc power supply 104 is greater than the second preset value, the first semiconductor device 107 is controlled to operate in the second mode so that the voltage value of the fourth capacitor 110 is less than the second preset value.
Specifically, in the second mode, the duty ratio of the first semiconductor device 1071 and the second semiconductor device 1072 is less than 0.5, and the duty ratio of the third semiconductor device 1073 and the fourth semiconductor device 1074 is greater than 0.5.
In the case that one half of the voltage value of the first dc power supply 104 is greater than the first preset value and less than the second preset value, the first semiconductor device 107 is controlled to operate in the third mode so that the voltage value of the fourth capacitor 110 is greater than the first preset value and less than the second preset value.
Specifically, in the third mode, the duty ratio of the first semiconductor device 1071, the second semiconductor device 1072, the third semiconductor device 1073, and the fourth semiconductor device 1074 is 0.5.
It will be appreciated that, in the case where one half of the voltage value of the first dc power source 104 is smaller than the first preset value or larger than the second preset value, the voltage value of the fourth capacitor 110 may be too low or too high, which may result in a larger current ripple of the inductance assembly 109, thereby reducing the efficiency of the energy storage converter 100. At this time, the duty ratios of the first semiconductor device 1071, the second semiconductor device 1072, the third semiconductor device 1073 and the fourth semiconductor device 1074 are adjusted, so that the voltage value of the fourth capacitor 110 is adjusted, the voltage value of the fourth capacitor 110 is kept between the first preset value and the second preset value, the current ripple of the inductance assembly 109 is further minimized, and the efficiency reduction of the energy storage converter 100 caused by the larger current ripple of the inductance assembly 109 is avoided.
Accordingly, in the case that one half of the voltage value of the first dc power supply 104 is greater than the first preset value and less than the second preset value, the first semiconductor device 107 is controlled to operate in the third mode so that the voltage value of the fourth capacitor 110 is greater than the first preset value and less than the second preset value. The current ripple of the inductance assembly 109 is minimized, and the efficiency reduction of the energy storage converter 100 caused by the larger current ripple of the inductance assembly 109 is avoided.
In this embodiment, the first dc power supply 104 is compared with the first preset value and the second preset value, and the first semiconductor device 107 is further controlled in operation mode according to the comparison result, so that the voltage value of the fourth capacitor 110 is greater than the first preset value and less than the second preset value. The current ripple of the inductance assembly 109 is minimized, and the efficiency reduction of the energy storage converter 100 caused by the larger current ripple of the inductance assembly 109 is avoided.
In some embodiments, optionally, in a case where the voltage value of the third capacitor 108 is greater than the third preset value and the current average value of the inductance component 109 is greater than 0, the on-time period of the first semiconductor device 1071 and the third semiconductor device 1073 is reduced, and the on-time period of the second semiconductor device 1072 and the fourth semiconductor device 1074 is increased, so that the voltage value of the third capacitor 108 is equal to the third preset value;
when the voltage value of the third capacitor 108 is greater than the third preset value and the average current value of the inductance component 109 is less than 0, the on-time of the first semiconductor device 1071 and the third semiconductor device 1073 is increased, and the on-time of the second semiconductor device 1072 and the fourth semiconductor device 1074 is reduced, so that the voltage value of the third capacitor 108 is equal to the third preset value;
When the voltage value of the third capacitor 108 is smaller than the third preset value and the average current value of the inductance component 109 is larger than 0, the on-time of the first semiconductor device 1071 and the third semiconductor device 1073 is increased, and the on-time of the second semiconductor device 1072 and the fourth semiconductor device 1074 is reduced, so that the voltage value of the third capacitor 108 is equal to the third preset value;
in the case where the voltage value of the third capacitor 108 is smaller than the third preset value and the average current value of the inductance component 109 is smaller than 0, the on-time period of the first semiconductor device 1071 and the third semiconductor device 1073 is reduced, and the on-time period of the second semiconductor device 1072 and the fourth semiconductor device 1074 is increased so that the voltage value of the third capacitor 108 is equal to the third preset value.
In this embodiment, in the case where the voltage value of the third capacitor 108 is greater than the third preset value and the average value of the currents of the inductance component 109 is greater than 0, the on-time of the first semiconductor device 1071 and the third semiconductor device 1073 is reduced, and the on-time of the second semiconductor device 1072 and the fourth semiconductor device 1074 is increased so that the voltage value of the third capacitor 108 is equal to the third preset value, the on-time being the time when the first semiconductor device 1071, the second semiconductor device 1072, the third semiconductor device 1073, or the fourth semiconductor device 1074 is in the on-state.
In a case where the voltage value of the third capacitor 108 is greater than the third preset value and the average current value of the inductance component 109 is less than 0, the on-time of the first semiconductor device 1071 and the third semiconductor device 1073 is increased, and the on-time of the second semiconductor device 1072 and the fourth semiconductor device 1074 is reduced, so that the voltage value of the third capacitor 108 is equal to the third preset value.
In the case where the voltage value of the third capacitor 108 is smaller than the third preset value and the average current value of the inductance component 109 is greater than 0, the on-time of the first semiconductor device 1071 and the third semiconductor device 1073 is increased, and the on-time of the second semiconductor device 1072 and the fourth semiconductor device 1074 is reduced, so that the voltage value of the third capacitor 108 is equal to the third preset value.
In the case where the voltage value of the third capacitor 108 is smaller than the third preset value and the average value of the currents of the inductance component 109 is smaller than 0, the on-time of the first semiconductor device 1071 and the third semiconductor device 1073 is reduced, and the on-time of the second semiconductor device 1072 and the fourth semiconductor device 1074 is increased so that the voltage value of the third capacitor 108 is equal to the third preset value.
The energy storage converter 100 in this embodiment adjusts the on-time of the first semiconductor device 1071, the second semiconductor device 1072, the third semiconductor device 1073 and the fourth semiconductor device 1074 so that the voltage value of the third capacitor 108 is equal to the third preset value, thereby realizing the voltage value balance of the energy storage converter 100 and further ensuring the safe operation of the energy storage converter 100.
In some embodiments, the first semiconductor device 1071, the second semiconductor device 1072, the third semiconductor device 1073, and the fourth semiconductor device 1074 each optionally include an insulated gate transistor and a diode for controlling the flow of current between the first port 101 and the second port 102 and the inductive component 109.
In this embodiment, the first semiconductor device 1071, the second semiconductor device 1072, the third semiconductor device 1073, and the fourth semiconductor device 1074 each include an insulated gate transistor and a diode for controlling the flow of current between the first port 101 and the second port 102 and the inductance assembly 109, wherein the diodes and the insulated gate transistors are antiparallel.
Illustratively, the anode of the diode is connected to the source of the insulated gate transistor and the cathode of the diode is connected to the drain of the insulated gate transistor.
The first semiconductor device 1071, the second semiconductor device 1072, the third semiconductor device 1073 and the fourth semiconductor device 1074 in the energy storage converter 100 in this embodiment each include an insulated gate transistor and a diode, so that voltage value balance of the energy storage converter 100 is achieved, and safe operation of the energy storage converter 100 is further ensured.
In some embodiments, as shown in fig. 2, optionally, the midpoint balanced leg 120 further comprises:
a branch resistor 112, one end of the branch resistor 112 is connected to the other end of the first capacitor 105;
the branch switch 114, one end of the branch switch 114 is connected with the other end of the branch resistor 112;
a fifth semiconductor device 116, wherein the positive electrode of the fifth semiconductor device 116 is connected to the other end of the branch switch 114, and the negative electrode of the fifth semiconductor device 116 is connected to one end of the third capacitor 108;
a sixth semiconductor device 118, the positive electrode of the sixth semiconductor device 118 being connected to the other end of the third capacitor 108, the negative electrode of the sixth semiconductor device 118 being connected to the other end of the branch switch 114;
the bypass switch 114 is used for controlling the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106 to be equal to one half of the voltage value of the first direct current power supply 104.
In this embodiment, the midpoint balanced leg 120 includes a leg resistor 112 and a leg switch 114, and the switching of the current in the leg resistor 112 can be achieved by the switching of the leg switch 114. Further, the dc converter module 103 further includes a fifth semiconductor device 116, where an anode of the fifth semiconductor device 116 is connected to the other end of the branch switch 114, and a cathode of the fifth semiconductor device 116 is connected to one end of the third capacitor 108; and a sixth semiconductor device 118, wherein a positive electrode of the sixth semiconductor device 118 is connected to the other end of the third capacitor 108, and a negative electrode of the sixth semiconductor device 118 is connected to the other end of the bypass switch 114. The fifth semiconductor device 116 and the sixth semiconductor device 118 serve to limit the current flow in the shunt resistor 112.
Illustratively, the fifth semiconductor device 116 and the sixth semiconductor device 118 may each be a diode.
The energy storage converter 100 in this embodiment controls the on or off of the branch switch 114, so as to connect the branch resistor 112 to the first semiconductor component 107, and further, adjust the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106, so that the voltage value of the first capacitor 105 is equal to the voltage value of the second capacitor 106, and balance the voltage values of the energy storage converter 100, and further, ensure safe operation of the energy storage converter 100.
In some embodiments, optionally, in a case where the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106 are not equal, and the voltage value of the second capacitor 106 is smaller than the difference between the voltage value of the first dc power source 104 and the voltage value of the third capacitor 108, the control branch switch 114 is closed, and the first semiconductor device 1071 is controlled to be turned on;
in the case that the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106 are not equal, and the voltage value of the first capacitor 105 is smaller than the difference between the voltage value of the first dc power supply 104 and the voltage value of the third capacitor 108, the control branch switch 114 is closed, and the fourth semiconductor device 1074 is controlled to be turned on.
In this embodiment, in the case where the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106 are not equal, and the voltage value of the second capacitor 106 is smaller than the difference between the voltage value of the first dc power supply 104 and the voltage value of the third capacitor 108, that is, in the case where the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106 are not equal, and the voltage value of the first capacitor 105 is larger than the voltage value of the second capacitor 106. The branch switch 114 is controlled to be closed so that the branch resistor 112 is connected to the first semiconductor element 107. Further, after the branch switch 114 is closed, the first semiconductor device 1071 is controlled to be turned on, so that current flows from the first semiconductor component 107 into the branch resistor 112, so that the voltage value of the first capacitor 105 is reduced, and the voltage value of the second capacitor 106 is increased, so that the voltage value of the first capacitor 105 is equal to the voltage value of the second capacitor 106.
In the case where the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106 are not equal, and the voltage value of the first capacitor 105 is smaller than the difference between the voltage value of the first dc power supply 104 and the voltage value of the third capacitor 108, that is, in the case where the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106 are not equal, and the voltage value of the first capacitor 105 is smaller than the voltage value of the second capacitor 106. The branch switch 114 is controlled to be closed so that the branch resistor 112 is connected to the first semiconductor element 107. Further, after the branch switch 114 is closed, the fourth semiconductor device 1074 is controlled to be turned on, so that current flows from the branch resistor 112 into the first semiconductor component 107, and thus the voltage value of the first capacitor 105 increases, and the voltage value of the second capacitor 106 decreases, so that the voltage value of the first capacitor 105 is equal to the voltage value of the second capacitor 106.
The energy storage converter 100 in this embodiment controls the on or off of the branch switch 114, and simultaneously cooperates with the conduction of the first semiconductor device 1071 and the fourth semiconductor device 1074, so as to connect the branch resistor 112 to the first semiconductor component 107, and further, adjust the voltage value of the first capacitor 105 and the voltage value of the second capacitor 106, so that the voltage value of the first capacitor 105 is equal to the voltage value of the second capacitor 106, and balance the voltage values of the energy storage converter 100, and further, ensure safe operation of the energy storage converter 100.
In some embodiments, optionally, the fifth semiconductor device 116 and the sixth semiconductor device 118 each include a diode for controlling the current flow between the shunt resistor 112 and the third capacitor 108.
As shown in fig. 3, an embodiment of the present invention provides a method for controlling an energy storage converter, including:
step 302, determining a first preset value according to a target output voltage value of the energy storage converter;
step 304, determining a second preset value according to the operation parameters of the AC converter module;
in step 306, the first semiconductor device is controlled so that the voltage value of the fourth capacitor is greater than the first preset value and less than the second preset value.
In this embodiment, a method for controlling an energy storage converter is provided, where the energy storage converter is an energy storage converter in any one of the foregoing embodiments, and the energy storage converter is connected to a first dc power supply.
Firstly, a target output voltage value of the energy storage current device is obtained, and a first preset value can be determined according to the target output voltage value.
For example, if the output is a three-phase three-wire system, the output voltage value isU ac1 A first preset valueU dcmin The method comprises the following steps:
if the output is three-phase four-wire system, the output voltage value isU ac2 A first preset valueU dcmin The method comprises the following steps:
where k is a compensation factor greater than 1, and is generally related to device voltage drop, dead time, etc., and is generally about 1.02.
Further, the first semiconductor component is controlled so that the voltage value of the fourth capacitor is larger than the first preset value and smaller than the second preset value.
Specifically, under the condition that one half of the voltage value of the first direct current power supply is smaller than a first preset value, controlling the first semiconductor component to operate in a first mode so as to enable the voltage value of the fourth capacitor to be larger than the first preset value;
in the first mode, the duty cycle of the first semiconductor device and the second semiconductor device is greater than 0.5, and the duty cycle of the third semiconductor device and the fourth semiconductor device is less than 0.5.
Specifically, in the first mode, as shown in fig. 10, the voltage value of the fourth capacitor may be setU c4 The reference value isU* c4 Reference valueU* c4 And sampled to obtainU c4 Subtracting, obtaining a reference value I of the inductance current by the difference through a voltage value ring UPI(s) L * . Reference valueI L * And sampled to obtainI L Subtracting, the difference value passes through a current loop CPI(s) to obtain the duty ratioD. The waveform diagram of the dc converter module in the first mode is shown in fig. 7. Wherein S is 1 Is a first semiconductor device, S 2 Is a second semiconductor device, S 3 Is a third semiconductor device, S 4 In the case of the fourth semiconductor device,U L1 as the voltage value of the inductive component,I L1 is the current of the inductive component.
And under the condition that one half of the voltage value of the first direct current power supply is larger than a second preset value, controlling the first semiconductor component to operate in a second mode so as to enable the voltage value of the fourth capacitor to be smaller than the second preset value.
In the second mode, the duty cycle of the first semiconductor device and the second semiconductor device is less than 0.5, and the duty cycle of the third semiconductor device and the fourth semiconductor device is greater than 0.5.
Specifically, in the second mode, as shown in FIG. 10, the voltage value of the fourth capacitor may be setU c4 The reference value isU* c4 Reference valueU* c4 And sampled to obtain U c4 Subtracting, obtaining the reference value of the inductance current by the difference value through a voltage value ring UPI(s)I L * . Reference valueI L * And sampled to obtainI L Subtracting, the difference value passes through a current loop CPI(s) to obtain the duty ratioD. The waveform diagram of the dc converter module in the second mode is shown in fig. 8. Wherein S is 1 Is a first semiconductor device, S 2 Is a second semiconductor device, S 3 Is a third semiconductor device, S 4 In the case of the fourth semiconductor device,U L1 as the voltage value of the inductive component,I L1 is the current of the inductive component.
Controlling the first semiconductor component to operate in a third mode under the condition that one half of the voltage value of the first direct current power supply is larger than a first preset value and smaller than a second preset value, so that the voltage value of the fourth capacitor is larger than the first preset value and smaller than the second preset value;
in the third mode, the duty ratio of the first semiconductor device, the second semiconductor device, the third semiconductor device, and the fourth semiconductor device is 0.5. The waveform diagram of the dc converter module in the third mode is shown in fig. 9. Wherein S is 1 Is a first semiconductor device, S 2 Is a second semiconductor device, S 3 Is a third semiconductor device, S 4 In the case of the fourth semiconductor device,U L1 as the voltage value of the inductive component,I L1 is the current of the inductive component.
In this embodiment, the first dc power supply is compared with the first preset value and the second preset value, so that the first semiconductor component is controlled in the operation mode according to the comparison result, so that the voltage value of the fourth capacitor is greater than the first preset value and less than the second preset value. The current ripple of the inductance component is minimized, and the efficiency reduction of the energy storage converter caused by the fact that the current ripple of the inductance component is large is avoided.
In one embodiment, as shown in FIG. 6, first, the voltage value of the fourth capacitor is calculated based on the AC voltage value that is required to be outputU c4 Reference value of (2) isU dcmin If (if)U c4 Too high, voltage spikes at the time of device turn-on or turn-off may cause device damage, and thus the ac converter module pairU c4 The highest value of (2) is limited toU dcmax . This value is typically determined experimentally or empirically.
Judging the voltage value of the first direct current power supplyUbat andUdcmax (d cm)Udcmin relationship. If it isUdcmin<0.5Ubat<Udcmax, the duty cycle is fixed at 0.5. Otherwise if 0.5Ubat<Udcmin, can set the capacitance C 4 Voltage valueU c4 Reference value of (2)U c4 * Is thatUdcmin, which enables the DC converter module to perform closed-loop control in the working mode 1; otherwise if notUdcmax<0.5Ubat, can set up the electric capacity C according to the overall efficiency consideration of the converter 4 Voltage valueU c4 The dc converter module is closed-loop controlled in operating mode 2.
In some embodiments, optionally, as shown in fig. 4, there is provided a control method of an energy storage converter, controlling the first semiconductor component to make the voltage value of the first capacitor, the voltage value of the second capacitor and the voltage value of the sixth capacitor equal, including:
step 402, determining a first preset value according to a target output voltage value of the energy storage converter;
step 404, determining a second preset value according to the operation parameters of the ac converter module;
step 406, controlling the first semiconductor device so that the voltage value of the fourth capacitor is greater than the first preset value and less than the second preset value;
step 408, obtaining a voltage value of the third capacitor;
in step 410, the first semiconductor device is controlled so that the voltage value of the third capacitor is a third predetermined value.
In this embodiment, the voltage value of the third capacitor may also be obtained, and then the first semiconductor device may be controlled so that the voltage value of the third capacitor is a third preset value.
Specifically, when the voltage value of the third capacitor is greater than a third preset value and the current average value of the inductance component is greater than 0, the conduction time of the first semiconductor device and the third semiconductor device is reduced, and the conduction time of the second semiconductor device and the fourth semiconductor device is increased, so that the voltage value of the third capacitor is equal to the third preset value;
When the voltage value of the third capacitor is larger than a third preset value and the current average value of the inductance component is larger than 0, the conduction time of the first semiconductor device and the third semiconductor device is increased, and the conduction time of the second semiconductor device and the fourth semiconductor device is reduced, so that the voltage value of the third capacitor is equal to the third preset value;
when the voltage value of the third capacitor is smaller than a third preset value and the current average value of the inductance component is larger than 0, the conduction time of the first semiconductor device and the third semiconductor device is increased, and the conduction time of the second semiconductor device and the fourth semiconductor device is reduced, so that the voltage value of the third capacitor is equal to the third preset value;
when the voltage value of the third capacitor is smaller than a third preset value and the current average value of the inductance component is larger than 0, the conduction time of the first semiconductor device and the third semiconductor device is reduced, and the conduction time of the second semiconductor device and the fourth semiconductor device is increased, so that the voltage value of the third capacitor is equal to the third preset value;
according to the energy storage converter in the embodiment, the voltage value of the third capacitor is a third preset value by adjusting the conduction time of the first semiconductor device, the second semiconductor device, the third semiconductor device and the fourth semiconductor device, so that the voltage value balance of the energy storage converter is realized, and the safe operation of the energy storage converter is further ensured.
In one implementation, as shown in FIG. 11, a third capacitance C is first obtained 3 Voltage value of (2)U c3 And set C 3 The reference value of the voltage value, i.e. the third preset valueU c3 * . Then, judgeU c3 And (3) withU c3 * Relationship between them. Meanwhile, the average current of the inductance component is judgedI Lave Whether greater than 0. If it isU c3 Greater thanU c3 * And is also provided withI Lave If the voltage is larger than zero, the time for simultaneously conducting the first semiconductor device and the third semiconductor device is reduced, and S is correspondingly increased 2 And S is 4 The time of simultaneous conduction; if it isU c3 Greater thanU c3 * And is also provided withI Lave If the current is smaller than zero, the time for simultaneously conducting the first semiconductor device and the third semiconductor device is increased, and the time for simultaneously conducting the second semiconductor device and the fourth semiconductor device is correspondingly reduced; if it isU c3 Less thanU c3 * And is also provided withI Lave If the voltage is larger than zero, the time for simultaneously conducting the first semiconductor device and the third semiconductor device is increased, and the time for simultaneously conducting the second semiconductor device and the fourth semiconductor device is correspondingly reduced; if it isU c3 Less thanU c3 * And is also provided withI Lave And if the voltage is smaller than zero, the time for simultaneously conducting the first semiconductor device and the third semiconductor device is reduced, and the time for simultaneously conducting the second semiconductor device and the fourth semiconductor device is correspondingly increased.
Specifically, the decreasing and increasing time Δt can be obtained by closed-loop control, which can adopt the structure shown in fig. 12. Reference value U c3 * And sampled to obtainU c3 Subtracting, dividing the difference by the average of the inductor currentsI Lave And then the delta T is obtained through the balance ring BPI(s).
In some embodiments, optionally, as shown in fig. 5, there is provided a control method of an energy storage converter, including:
step 502, determining a first preset value according to a target output voltage value of the energy storage converter;
step 504, determining a second preset value according to the operation parameters of the ac converter module;
step 506, controlling the first semiconductor component so that the voltage value of the fourth capacitor is greater than the first preset value and less than the second preset value;
step 508, obtaining a voltage value of the third capacitor;
step 510, controlling the first semiconductor device so that the voltage value of the third capacitor is a third preset value;
step 512, obtaining a voltage value of the first capacitor and a voltage value of the second capacitor;
step 514, controlling the midpoint balance branch and the first semiconductor component of the energy storage converter to make the voltage value of the first capacitor and the voltage value of the second capacitor equal to a fourth preset value.
In this embodiment, the neutral point balancing branch and the first semiconductor component are controlled such that the voltage value of the first capacitor and the voltage value of the second capacitor are equal to a fourth preset value, i.e. such that the voltage value of the first capacitor is equal to the voltage value of the second capacitor. Specifically, in the case where the voltage value of the first capacitor and the voltage value of the second capacitor are not equal, and the voltage value of the second capacitor is smaller than the difference between the voltage value of the first dc power supply and the voltage value of the third capacitor, that is, in the case where the voltage value of the first capacitor and the voltage value of the second capacitor are not equal, and the voltage value of the first capacitor is greater than the voltage value of the second capacitor. The branch switch controlling the midpoint balanced branch is closed such that the branch resistor is connected into the first semiconductor assembly. Further, after the branch switch is closed, the first semiconductor device is controlled to be turned on, so that current flows from the first semiconductor component into the branch resistor, the voltage value of the first capacitor is reduced, and the voltage value of the second capacitor is increased, so that the voltage value of the first capacitor is equal to the voltage value of the second capacitor.
In the case that the voltage value of the first capacitor and the voltage value of the second capacitor are not equal, and the voltage value of the first capacitor is smaller than the difference between the voltage value of the first direct current power supply and the voltage value of the third capacitor, that is, the voltage value of the first capacitor and the voltage value of the second capacitor are not equal, and the voltage value of the first capacitor is smaller than the voltage value of the second capacitor. The branch switch controlling the midpoint balanced branch is closed such that the branch resistor is connected into the first semiconductor assembly. Further, after the branch switch is closed, the fourth semiconductor device is controlled to be turned on, so that current flows into the first semiconductor component from the branch resistor, the voltage value of the first capacitor is increased, and the voltage value of the second capacitor is reduced, so that the voltage value of the first capacitor is equal to the voltage value of the second capacitor.
The energy storage converter in the embodiment realizes the connection of the branch resistor to the first semiconductor component by controlling the on or off of the branch switch of the midpoint balance branch and matching with the conduction of the first semiconductor device and the fourth semiconductor device, thereby realizing the adjustment of the voltage value of the first capacitor and the voltage value of the second capacitor, so that the voltage value of the first capacitor is equal to the voltage value of the second capacitor, realizing the voltage value balance of the energy storage converter, and further ensuring the safe operation of the energy storage converter.
In one embodiment, as shown in FIG. 13, the voltage value of the first capacitor may be set firstU c1 The upper limit Δumax of the voltage value deviation from the voltage value Uc2 of the second capacitor. Then, the absolute value of the difference between Uc1 and Uc2 is calculated, and the relation with Umax is judged. If Uc1-Uc2 is greater than Umax, closing the bypass switch K1; otherwise, K1 is disconnected.
Further, in order to avoid frequent actions of K1, K may be performed as follows 1 As shown in fig. 14:
first, two threshold voltage values Δuth1 and Δuth2 are set, and Δuth1< Δuth2. And judging the state of K1. The absolute value of the difference between Uc1 and Uc2 is calculated, and the relationship with DeltaUth 1 and DeltaUth 2 is determined. If K1 is already closed and |Uc1-Uc2| is smaller than DeltaUth 1, then K1 is opened; if K1 has been closed and |Uc1-Uc2| is greater than ΔUth1, then K1 remains closed; if K1 has been opened and |Uc1-Uc2| is greater than DeltaUth 2, then K1 is closed; if K1 has been turned off and |Uc1-Uc2| is less than ΔUth2, K1 remains turned off.
As shown in fig. 15, in an embodiment of the present invention, there is provided a control apparatus 1500 of an energy storage converter, including:
an obtaining module 1502, configured to obtain a first preset value according to a target output voltage value of the energy storage converter; determining a second preset value according to the operation parameters of the alternating current converter module;
The control module 1504 is configured to control the first semiconductor device so that the voltage value of the fourth capacitor is greater than the first preset value and less than the second preset value.
In this embodiment, a control device 1500 of an energy storage converter is provided, where the energy storage converter is an energy storage converter in any of the foregoing embodiments, and the energy storage converter is connected to a first dc power supply.
The control device of the energy storage converter in the embodiment can adjust the voltage value of the fourth capacitor in the operation process of occasions with high direct current voltage value and low alternating current voltage value, so that the voltage value of the fourth capacitor is kept between the first preset value and the second preset value, further, current ripple of the inductance component is enabled to be minimum, and efficiency reduction of the energy storage converter caused by larger current ripple of the inductance component is avoided.
In some embodiments, as shown in fig. 16, optionally, a control device 1600 of an energy storage converter is provided, where the control device 1600 of an energy storage converter includes a processor 1602 and a memory 1604, and a program or an instruction is stored in the memory 1604, where the program or the instruction is executed by the processor 1602 to implement the steps of the control method of an energy storage converter according to any of the foregoing claims. Therefore, the control device 1600 of the energy storage converter has all the advantages of the control method of the energy storage converter in any of the above-mentioned embodiments, and will not be described herein.
In some embodiments, optionally, a readable storage medium is provided, on which a program is stored, which when executed by a processor, implements a method for controlling an energy storage converter as in any of the embodiments above, thereby having all the beneficial technical effects of the method for controlling an energy storage converter as in any of the embodiments above.
Among them, readable storage media such as Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, and the like.
It is to be understood that in the claims, specification and drawings of the present invention, the term "plurality" means two or more, and unless otherwise explicitly defined, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and making the description process easier, and not for the purpose of indicating or implying that the apparatus or element in question must have the particular orientation described, be constructed and operated in the particular orientation, so that these descriptions should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly, and may be, for example, a fixed connection between a plurality of objects, a removable connection between a plurality of objects, or an integral connection; the objects may be directly connected to each other or indirectly connected to each other through an intermediate medium. The specific meaning of the terms in the present invention can be understood in detail from the above data by those of ordinary skill in the art.
In the claims, specification, and drawings of the present invention, the descriptions of terms "one embodiment," "some embodiments," "particular embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. An energy storage converter for converting a dc power source to an ac power source, the energy storage converter comprising:
the first port and the second port are used for being connected with a first direct current power supply;
The direct current converter module comprises a first capacitor and a second capacitor, one end of the first capacitor is connected with the first port, the other end of the first capacitor is connected with one end of the second capacitor, and the other end of the second capacitor is connected with the second port;
the direct current converter module further comprises a first semiconductor assembly, wherein the first semiconductor assembly comprises a first semiconductor device, a second semiconductor device, a third semiconductor device and a fourth semiconductor device, a first end of the first semiconductor device is connected with the first capacitor, a second end of the first semiconductor device is connected with a first end of the second semiconductor device, a second end of the second semiconductor device is connected with a first end of the third semiconductor device, a second end of the third semiconductor device is connected with a first end of the fourth semiconductor device, and a second end of the fourth semiconductor device is connected with the second capacitor;
the direct current converter module further comprises a third capacitor, one end of the third capacitor is connected with the second end of the first semiconductor device, and the other end of the third capacitor is connected with the second end of the third semiconductor device;
The direct current converter module further comprises an inductance component, and one end of the inductance component is connected with the second end of the second semiconductor device;
the direct current converter module further comprises a fourth capacitor, one end of the fourth capacitor is connected with the other end of the inductance component, and the other end of the fourth capacitor is connected with the second port;
the direct current converter module further comprises a midpoint balance branch, wherein a first end of the midpoint balance branch is connected with the other end of the first capacitor, a second end of the midpoint balance branch is connected with one end of the third capacitor, and a third end of the midpoint balance branch is connected with the other end of the third capacitor;
the alternating current converter module is used for converting direct current output by the direct current converter module into alternating current;
the first semiconductor component is used for adjusting the voltage value of the fourth capacitor so that the voltage value of the fourth capacitor is larger than a first preset value and smaller than a second preset value;
The first semiconductor component is further configured to adjust a voltage value of the third capacitor, so that the voltage value of the third capacitor is a third preset value;
the midpoint balance branch is used for adjusting the voltage value of the first capacitor and the voltage value of the second capacitor so that the voltage value of the first capacitor and the voltage value of the second capacitor are fourth preset values.
2. The energy storage converter of claim 1, wherein the energy storage converter comprises a power source,
controlling the first semiconductor component to operate in a first mode under the condition that one half of the voltage value of the first direct current power supply is smaller than the first preset value, so that the voltage value of the fourth capacitor is larger than the first preset value;
in the first mode, a duty cycle of the first semiconductor device and the second semiconductor device is greater than 0.5, and a duty cycle of the third semiconductor device and the fourth semiconductor device is less than 0.5;
controlling the first semiconductor component to operate in a second mode under the condition that one half of the voltage value of the first direct current power supply is larger than the second preset value, so that the voltage value of the fourth capacitor is smaller than the second preset value;
In the second mode, the duty cycle of the first semiconductor device and the second semiconductor device is less than 0.5, and the duty cycle of the third semiconductor device and the fourth semiconductor device is greater than 0.5;
controlling the first semiconductor component to operate in a third mode under the condition that one half of the voltage value of the first direct current power supply is larger than the first preset value and smaller than the second preset value, so that the voltage value of the fourth capacitor is larger than the first preset value and smaller than the second preset value;
in the third mode, the duty ratio of the first semiconductor device, the second semiconductor device, the third semiconductor device, and the fourth semiconductor device is 0.5.
3. The energy storage converter of claim 1, wherein the energy storage converter comprises a power source,
when the voltage value of the third capacitor is larger than the third preset value and the average value of the current of the inductance component is larger than 0, reducing the conduction time of the first semiconductor device and the third semiconductor device, and increasing the conduction time of the second semiconductor device and the fourth semiconductor device so that the voltage value of the third capacitor is equal to the third preset value;
When the voltage value of the third capacitor is larger than the third preset value and the average value of the current of the inductance component is smaller than 0, the conduction time of the first semiconductor device and the third semiconductor device is increased, and the conduction time of the second semiconductor device and the fourth semiconductor device is reduced, so that the voltage value of the third capacitor is equal to the third preset value;
when the voltage value of the third capacitor is smaller than the third preset value and the average value of the current of the inductance component is larger than 0, the conduction time of the first semiconductor device and the third semiconductor device is increased, and the conduction time of the second semiconductor device and the fourth semiconductor device is reduced, so that the voltage value of the third capacitor is equal to the third preset value;
and when the voltage value of the third capacitor is smaller than the third preset value and the average value of the current of the inductance component is smaller than 0, reducing the conduction time of the first semiconductor device and the third semiconductor device, and increasing the conduction time of the second semiconductor device and the fourth semiconductor device so that the voltage value of the third capacitor is equal to the third preset value.
4. The energy storage converter of claim 1, wherein the energy storage converter comprises a power source,
the first semiconductor device, the second semiconductor device, the third semiconductor device and the fourth semiconductor device each include an insulated gate transistor and a diode for controlling a current flow between the first and second ports and the inductance assembly.
5. The energy storage converter of claim 1, wherein the midpoint balanced leg comprises:
the branch resistor is connected with the other end of the first capacitor at one end;
one end of the branch switch is connected with the other end of the branch resistor;
a fifth semiconductor device, wherein the positive electrode of the fifth semiconductor device is connected with the other end of the branch switch, and the negative electrode of the fifth semiconductor device is connected with one end of the third capacitor;
a sixth semiconductor device, wherein the positive electrode of the sixth semiconductor device is connected with the other end of the third capacitor, and the negative electrode of the sixth semiconductor device is connected with the other end of the branch switch;
the branch switch is used for controlling the voltage value of the first capacitor and the voltage value of the second capacitor to be equal to one half of the voltage value of the first direct current power supply.
6. The energy storage converter of claim 5, wherein,
when the voltage value of the first capacitor is not equal to the voltage value of the second capacitor, and the voltage value of the second capacitor is smaller than the difference between the voltage value of the first direct current power supply and the voltage value of the third capacitor, the branch switch is controlled to be closed, and the first semiconductor device is controlled to be conducted;
and under the condition that the voltage value of the first capacitor is not equal to the voltage value of the second capacitor, and the voltage value of the first capacitor is smaller than the difference between the voltage value of the first direct current power supply and the voltage value of the third capacitor, controlling the branch switch to be closed and controlling the fourth semiconductor device to be conducted.
7. The energy storage converter of claim 5, wherein,
the fifth semiconductor device and the sixth semiconductor device each include a diode for controlling a current flow direction between the branch resistor and the third capacitor.
8. A control method of an energy storage converter, wherein the energy storage converter is the energy storage converter according to any one of claims 1 to 7, the energy storage converter is connected to the first direct current power source, the control method of the energy storage converter includes:
Determining the first preset value according to the target output voltage value of the energy storage converter;
determining the second preset value according to the operation parameters of the alternating current converter module;
and controlling the first semiconductor component so that the voltage value of the fourth capacitor is larger than a first preset value and smaller than a second preset value.
9. The method of claim 8, further comprising:
acquiring a voltage value of the third capacitor;
and controlling the first semiconductor component to enable the voltage value of the third capacitor to be a third preset value.
10. The method of claim 8, further comprising:
acquiring a voltage value of the first capacitor and a voltage value of the second capacitor;
and controlling the midpoint balance branch of the energy storage converter and the first semiconductor component so that the voltage value of the first capacitor and the voltage value of the second capacitor are equal to a fourth preset value.
11. A control device for an energy storage converter, wherein the energy storage converter is the energy storage converter according to any one of claims 1 to 7, the energy storage converter is connected to the first direct current power source, the control device for an energy storage converter includes:
The acquisition module is used for acquiring the first preset value according to the target output voltage value of the energy storage converter; and
determining the second preset value according to the operation parameters of the alternating current converter module;
the control module is used for controlling the first semiconductor component so that the voltage value of the fourth capacitor is larger than a first preset value and smaller than a second preset value.
12. A control device for an energy storage converter, comprising:
a processor;
a memory in which a program or instructions are stored, which processor, when executing the program or instructions in the memory, implements the steps of the method of controlling an energy storage converter according to any one of claims 8 to 10.
13. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions, which when executed by a processor, implement the steps of the method of controlling an energy storage converter according to any of claims 8 to 10.
CN202311574597.6A 2023-11-23 2023-11-23 Energy storage converter, control method and device thereof and readable storage medium Active CN117318475B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311574597.6A CN117318475B (en) 2023-11-23 2023-11-23 Energy storage converter, control method and device thereof and readable storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311574597.6A CN117318475B (en) 2023-11-23 2023-11-23 Energy storage converter, control method and device thereof and readable storage medium

Publications (2)

Publication Number Publication Date
CN117318475A CN117318475A (en) 2023-12-29
CN117318475B true CN117318475B (en) 2024-01-30

Family

ID=89281346

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311574597.6A Active CN117318475B (en) 2023-11-23 2023-11-23 Energy storage converter, control method and device thereof and readable storage medium

Country Status (1)

Country Link
CN (1) CN117318475B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117811052B (en) * 2024-02-29 2024-05-07 京清数电(北京)技术有限公司 Control method and system of energy storage converter, electronic equipment and storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112737070A (en) * 2021-01-21 2021-04-30 华中科技大学 Integrated drive charging circuit and control system based on clamping type three-level converter
CN112787530A (en) * 2021-01-11 2021-05-11 上海电气富士电机电气技术有限公司 Three-level inverter with bus midpoint voltage compensation and control method thereof
CN113783453A (en) * 2021-09-29 2021-12-10 山东建筑大学 Low-cost high-gain three-level inverter and space vector modulation method thereof
CN116232050A (en) * 2023-01-05 2023-06-06 中南大学 Direct-current three-level DC-DC converter for rail transit vehicle and control method thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8441820B2 (en) * 2010-09-29 2013-05-14 General Electric Company DC-link voltage balancing system and method for multilevel converters
US20170288574A1 (en) * 2014-08-08 2017-10-05 Otis Elevator Company Neutral point regulator hardware for a multi-level drive

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112787530A (en) * 2021-01-11 2021-05-11 上海电气富士电机电气技术有限公司 Three-level inverter with bus midpoint voltage compensation and control method thereof
CN112737070A (en) * 2021-01-21 2021-04-30 华中科技大学 Integrated drive charging circuit and control system based on clamping type three-level converter
CN113783453A (en) * 2021-09-29 2021-12-10 山东建筑大学 Low-cost high-gain three-level inverter and space vector modulation method thereof
CN116232050A (en) * 2023-01-05 2023-06-06 中南大学 Direct-current three-level DC-DC converter for rail transit vehicle and control method thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
并联T型三电平储能变流器零序环流抑制;陈刚;蒋顺平;丁勇;李旭;石祥建;刘为群;;电力工程技术(第05期);全文 *
并联T型三电平逆变器环流抑制和中点平衡研究;邢相洋;陈阿莲;张子成;张承慧;;中国电机工程学报(第14期);全文 *

Also Published As

Publication number Publication date
CN117318475A (en) 2023-12-29

Similar Documents

Publication Publication Date Title
US10523112B2 (en) Power converter and method of controlling the same
Bi et al. A capacitor clamped H-type boost DC-DC converter with wide voltage-gain range for fuel cell vehicles
Shen et al. Operation modes and characteristics of the Z-source inverter with small inductance or low power factor
US7005759B2 (en) Integrated converter having three-phase power factor correction
CN103607131B (en) Three-level inverter neutral-point potential balance control method
CN117318475B (en) Energy storage converter, control method and device thereof and readable storage medium
US20140119088A1 (en) Three-level inverter and power supply equipment
JP5539337B2 (en) Energy recovery device for variable speed drive
US20230238876A1 (en) Electrical power converter
Koushki et al. A bi-directional AC-DC converter for electric vehicle with no electrolytic capacitor
Zhang et al. New digital control method for power factor correction
EP2755309B1 (en) Power-factor correction circuit and power circuit
EP4391341A1 (en) Multi-level direct current converter, voltage control method for flying capacitor, and control apparatus
CN114793073B (en) Fuel cell power generation system, fuel cell power generation circuit, and control method therefor
US20240275261A1 (en) Modulation mode for a switching power converter
Hassanpour et al. Soft start and protection of bidirectional buck-boost partial power converter
CN113690894B (en) Voltage regulating circuit and voltage regulating device
CN114696616A (en) Three-port high-gain boost DC/DC converter based on differential connection and control method thereof
Georgious et al. Switching Schemes of the bidirectional buck-boost converter for energy storage system
KR20210129894A (en) Dc-dc converter and method for controlling the same
CN117477962B (en) Control method suitable for reverse discharge of LLC full-bridge direct-current converter
CN112910296B (en) Single-phase inverter
CN117595691A (en) Three-level energy storage converter, control method and device thereof and readable storage medium
CN116614003B (en) Isolated bidirectional DC/DC conversion circuit
US20240243604A1 (en) Power conversion circuit and control method thereof, battery pack, and energy storage system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant