CN111106644A - Power supply control method and power supply system - Google Patents
Power supply control method and power supply system Download PDFInfo
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- CN111106644A CN111106644A CN201911339790.5A CN201911339790A CN111106644A CN 111106644 A CN111106644 A CN 111106644A CN 201911339790 A CN201911339790 A CN 201911339790A CN 111106644 A CN111106644 A CN 111106644A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- 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
- 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
- H02M3/145—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a power supply control method, which comprises the steps of collecting a current value, a voltage value and a temperature value in a power conversion circuit, judging whether any one value exceeds a threshold value, and stopping power supply if any one value exceeds the threshold value; if the current value and the voltage value are not more than the preset value, the current value and the voltage value are respectively subtracted from the input current value and the voltage value of the outer ring, the duty ratio of each phase of the power conversion circuit is output, the ratio of the average value of the duty ratio to the duty ratio is judged, and the phase of the power converter is adjusted. The invention also provides a power supply system. Compared with the prior art, the high-power direct current converter with strong realizability, high gain and low ripple overcomes the defects of the prior art.
Description
Technical Field
The invention relates to the field of control of power supply systems, in particular to a control method for power supply of a direct current converter of a high-power low-voltage high-current new energy battery.
Background
In recent years, with social development and progress, problems such as energy shortage and environmental pollution become more and more remarkable, and technologies such as development of renewable clean energy and diversification of energy have become necessary choices for future development of human beings. The energy is an important material basis for the development of human society and also a prime mover for human to engage in various social and economic activities. In 6 months 2012, the famous american economist jiemm, rifugin proposed that the world will step into the "carbon after" era, and a third industrial revolution featuring the combination of internet technology and renewable energy sources will be the hope of human sustainable development, avoiding catastrophic climate changes. China is adjusting the current energy structure from a war, and vigorously researches and develops clean renewable energy technology, including development and application of wind energy, solar energy, hydrogen energy and other energy sources. However, the voltage levels of wind energy, solar energy and fuel cells are relatively low and widely varied, so that electricity generated by these new energy sources cannot be directly used for storage batteries, loads and inverters, and a large voltage gain is required to apply these loads.
The large-scale development and utilization of new energy is an important way for solving the problems of energy and environment and realizing the sustainable development of economy and society at present. In recent years, the rapid development of new energy power generation technology has led to the rapid development of distributed power generation technology, and in order to enable new energy such as fuel cells and solar photovoltaic cells to supply power to storage batteries, loads and inverters, it is necessary to provide a power supply method and a power supply system which are simple to control, have strong realizability, high gain and low ripple, and are high-power direct current converters to overcome the defects in the prior art.
Disclosure of Invention
At present, in a power converter of a power supply system, a traditional Boost circuit and a bidirectional Boost-Buck circuit are widely applied, but for a high-power fuel cell, in practical application, due to large input current, the requirement on devices is particularly high if the traditional circuit is adopted to realize the functions, the volume of the whole system is increased, and loss voltage drop is increased.
The invention aims to provide a power supply control method and a power supply system of a direct current power converter based on a high-power fuel cell, which have the functions of boosting a direct current voltage with a lower voltage grade into a direct current voltage with a higher voltage grade and supplying power to a load; the inverter is connected to a power grid and provides input voltage for the inverter; charging a battery, etc.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a power supply control method comprises the steps of collecting a current value, a voltage value and a temperature value in a power conversion circuit, judging whether any one value exceeds a threshold value, and stopping power supply if any one value exceeds the threshold value; if the current value and the voltage value do not exceed the threshold value, the current value and the voltage value are respectively subtracted from the input current value and the voltage value of the outer ring, the duty ratio of each phase of the power conversion circuit is output, the ratio of the average value of the duty ratio to the duty ratio is judged, and the phase of the power converter is adjusted.
On the basis of the above technical solution, preferably, the average value of the duty ratio value and the ratio of the duty ratio are judged, and if the error is less than or equal to 5%, the duty ratio value is kept unchanged;
if the error is larger than 5%, the duty ratio value is taken as an average value, and then phase shifting is carried out to enable the phase difference of the three-phase duty ratio of the power converter to be 120 degrees.
On the basis of the above technical solution, preferably, the current values are a total input current, an output current and a 3-phase inductive current.
On the basis of the above technical solution, preferably, the voltage value is the intermediate capacitor voltage and the output voltage.
On the basis of the above technical solution, preferably, the temperature is a temperature of the power converter.
A power supply system comprises a power conversion circuit, a relay control module, a filter circuit, a storage battery, a fuel cell, a load and a controller, wherein the controller collects a current value, a voltage value and a temperature value in the power conversion circuit, judges whether any one value exceeds a threshold value, and stops supplying power to the storage battery and the load if the any one value exceeds the threshold value;
if the current value and the voltage value in the power conversion circuit do not exceed the threshold value, the difference is respectively made between the current value and the voltage value of the outer ring input, the duty ratio value of each phase of the power conversion circuit is output, the ratio of the average value of the duty ratio value to the duty ratio is judged, and the phase of the power converter is adjusted.
On the basis of the above technical solution, preferably, the controller includes a logic controller, an average current module, a constant voltage output module, a constant current output module, a PWM driving module, a signal collecting and processing module, and a relay control module, where the relay control module is configured to be a human-computer interface, the signal collecting module collects a current value, a voltage value, and a temperature value of the power converter, the logic controller receives an information number collected by the signal collecting module, calculates the information number with a peripheral input signal of the human-computer interface, and sends a feedback signal to the average current module, the constant voltage output module, and the constant current output module, the average current module, the constant voltage output module, and the constant current output module controls the PWM driving module to drive according to the feedback signal, and the relay control module is configured to receive a control signal.
On the basis of the technical scheme, preferably, the power conversion circuit comprises two stages of direct current conversion circuits, namely a front stage circuit and a rear stage circuit, wherein the front stage circuit comprises three single-phase Boost circuits connected in parallel, each phase is formed by connecting an inductor and a diode in series, and an IGBT is connected between the inductor and the diode; the rear-stage circuit consists of six bridge arms, the first two bridge arms are formed by connecting an upper bridge arm IGBT and a lower bridge arm IGBT in series, the second four bridge arms are formed by connecting an upper bridge arm diode and a lower bridge arm diode in series, the first two bridge arms and the second four bridge arms are connected through a resonant inductor, a blocking capacitor and a high-frequency transformer, and the front-stage circuit and the rear-stage circuit are connected in parallel through two capacitors.
Compared with the prior art, the power supply control method and the power supply system have the following beneficial effects:
the power supply device can independently supply power for loads, provide high-grade input voltage for the inverter, charge a storage battery and the like, and has high efficiency and small output voltage and current ripples.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a logic flow diagram of a power supply method of the present invention.
Fig. 2 is a schematic block diagram of the power supply system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the power supply control method of the present invention includes collecting a current value, a voltage value and a temperature value in a power conversion circuit, determining whether any one of the values exceeds a threshold, and stopping power supply if any one of the values exceeds the threshold;
if the current value and the voltage value are not more than the preset value, the current value and the voltage value are respectively subtracted from the input current value and the voltage value of the outer ring, the duty ratio of each phase of the power conversion circuit is output, the ratio of the average value of the duty ratio to the duty ratio is judged, and the phase of the power converter is adjusted.
Judging the ratio of the average value of the duty ratio value to the duty ratio value, and keeping the duty ratio value unchanged if the error is within 5%;
if the error is larger than 5%, the duty ratio value is taken as an average value, and then phase shifting is carried out to enable the phase difference of the three-phase duty ratio of the power converter to be 120 degrees.
And adjusting the phase and then entering the next real-time monitoring state.
As shown in fig. 2, a power supply system includes a power conversion circuit, a relay control module, a filter circuit, a storage battery, a fuel cell, a load, and a controller, where the controller collects a current value, a voltage value, and a temperature value in the power conversion circuit, determines whether any one of the values exceeds a threshold, and stops supplying power to the storage battery and the load if the value exceeds the threshold;
if the current value and the voltage value in the power conversion circuit do not exceed the preset values, the current value and the voltage value in the power conversion circuit are respectively subtracted from the input current value and the voltage value of the outer ring, the duty ratio value of each phase of the power conversion circuit is output, the ratio of the average value of the duty ratio value to the duty ratio is judged, and the phase of the power converter is adjusted.
The controller comprises a logic controller, an average current module, a constant voltage output module, a constant current output module, a PWM (pulse width modulation) driving module and a signal acquisition and processing module, wherein the relay control module is used for a human-computer interface, the signal acquisition module acquires a current value, a voltage value and a temperature value of the power converter, the logic controller receives an information number acquired by the signal acquisition module, calculates the information number with peripheral input signals of the human-computer interface, sends feedback signals to the average current module, the constant voltage output module and the constant current output module, the average current module and the constant voltage output module control the PWM driving module to drive according to the feedback signals, and the relay control module is used for receiving control signals.
The power conversion circuit comprises two stages of direct current conversion circuits, namely a front stage circuit and a rear stage circuit, wherein the front stage circuit comprises three single-phase Boost circuits connected in parallel, each phase is formed by connecting an inductor and a diode in series, and an IGBT is connected between the inductor and the diode; the rear-stage circuit consists of six bridge arms, the first two bridge arms are formed by connecting an upper bridge arm IGBT and a lower bridge arm IGBT in series, the second four bridge arms are formed by connecting an upper bridge arm diode and a lower bridge arm diode in series, the first two bridge arms and the second four bridge arms are connected through a resonant inductor, a blocking capacitor and a high-frequency transformer, and the front-stage circuit and the rear-stage circuit are connected in parallel through two capacitors.
Wherein the signal acquisition and processing module is used for collecting the preceding stage powerTotal input current i in the pathinInductor current ila、ilb、ilc(ii) a Intermediate stage capacitor voltage Uc1And output inductor current iloutOutput capacitor voltage UCoutThe temperature value is sent to a logic controller after sampling processing, and the logic controller judges the working mode of the whole system according to the signal sent by sampling, such as the constant current output mode and the constant voltage output mode are started or stopped; and respectively sending the control signals to an average current module, a constant current output or constant voltage output mode and a relay control module.
The average current module takes the intermediate-level voltage in the data processed by the logic controller as an outer ring input, subtracts a given voltage from a voltage sent by a human-computer interface and then sends the subtracted voltage to a PI (proportion integration) module, obtains an average value of a given and previous-stage inductive current which is output to a current inner ring and then is subtracted from the average value of the given and previous-stage inductive current and then sends the subtracted value to the PI module, obtains a duty ratio which is output as each phase, averages the obtained duty ratios and then compares the average value with the duty ratios, and if the error is within 5%; and if the error is larger than 5%, taking the average value as the duty ratio, then shifting the phase to ensure that the phase difference of the three-phase duty ratios is 120 degrees, obtaining the driving signal of the IGBT of the three-phase interleaved Boost, and sending the driving signal to a PWM driving module with protection.
When the output mode is a constant-current output mode or a constant-voltage output mode, a working mode instruction sent by the logic processor is obtained, so that the output current after the voltage is output is selected as a target of final control, then a sampled value is used as a feedback value, a value received by the man-machine interface is subtracted from a given value and is sent to the PI controller, and the obtained value is the phase shift size of a rear-stage two bridge arms and is sent to the PWM driving module with the protection function and is sent to the driving port of the IGBT.
Wherein the controller controls the relay control module, which controls the closing and opening of the relays J1, J2, J3, J4. The relay J1 ensures that the whole direct current converter system does not have great impact to cause damage to devices in the initial starting stage and then can normally operate; j2, J3, J4 guarantee seamless switching at output state switching.
Under the condition of constant input power, if high current is needed, J2 is opened, and J3 and J4 are closed; when the large voltage is needed for working, the reverse action is performed; and J2 and J3, J4 themselves require actions to be opposite and not to work simultaneously. Particularly, when the battery is charged, the battery can be charged by large current and small voltage when the voltage is small, and the battery is switched to large voltage when the voltage of the battery is equal to the voltage of the output voltage, so that the charging rapidity can be ensured.
The power supply system adopts a two-stage circuit and the front stage adopts a three-phase staggered Boost circuit, so that the voltage resistance, the current resistance grade and the stress of the device are reduced under the condition of high power, the integral volume is reduced, and the integral heat dissipation effect is enhanced; the device has two working modes, namely constant-current output and constant-voltage output; the energy can be provided for loads, storage batteries and the like, the control is simple, the output total harmonic component is low, and the efficiency is high.
The present invention has been described in connection with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, and is intended to cover various modifications, equivalent combinations, which are made in accordance with the spirit of the present invention.
Claims (8)
1. A power supply control method comprises the steps of collecting a current value, a voltage value and a temperature value in a power conversion circuit, judging whether any one value exceeds a threshold value, and stopping power supply if any one value exceeds the threshold value;
if the current value and the voltage value do not exceed the threshold value, the current value and the voltage value are respectively subtracted from the input current value and the voltage value of the outer ring, the duty ratio of each phase of the power conversion circuit is output, the ratio of the average value of the duty ratio to the duty ratio is judged, and the phase of the power converter is adjusted.
2. A method of controlling power supply according to claim 1, wherein: judging the ratio of the average value of the duty ratio value to the duty ratio value, and if the error is less than or equal to 5%, keeping the duty ratio value unchanged;
if the error is larger than 5%, the duty ratio value is taken as an average value, and then phase shifting is carried out to ensure that the phase difference of the three-phase duty ratio of the power converter is 120°。
3. A method of controlling power supply according to claim 1, wherein: the current values are total input current, output current and 3-phase inductive current.
4. A method of controlling power supply according to claim 1, wherein: the voltage value is the intermediate capacitor voltage and the output voltage.
5. A method of controlling power supply according to claim 1, wherein: the temperature is the temperature of the power converter.
6. A power supply system comprises a power conversion circuit, a relay control module, a filter circuit, a storage battery, a fuel cell, a load and a controller, wherein the controller collects a current value, a voltage value and a temperature value in the power conversion circuit, judges whether any one value exceeds a threshold value, and stops supplying power to the storage battery and the load if the any one value exceeds the threshold value;
if the current value and the voltage value in the power conversion circuit do not exceed the threshold value, the difference is respectively made between the current value and the voltage value of the outer ring input, the duty ratio value of each phase of the power conversion circuit is output, the ratio of the average value of the duty ratio value to the duty ratio is judged, and the phase of the power converter is adjusted.
7. A power supply system according to claim 6, wherein: the controller comprises a logic controller, an average current module, a constant voltage output module, a constant current output module, a PWM driving module and a signal acquisition and processing module, wherein the relay control module is used for a human-computer interface, the signal acquisition module acquires a current value, a voltage value and a temperature value of the power converter, the logic controller receives an information number acquired by the signal acquisition module, calculates the information number with peripheral input signals of the human-computer interface, and sends feedback signals to the average current module, the constant voltage output module and the constant current output module, the average current module, the constant voltage output module and the constant current output module control the PWM driving module to drive according to the feedback signals, and the relay control module is used for receiving control signals.
8. A power supply system according to claim 6, wherein: the power conversion circuit comprises two stages of direct current conversion circuits, namely a front stage circuit and a rear stage circuit, wherein the front stage circuit comprises three single-phase Boost circuits connected in parallel, each phase is formed by connecting an inductor and a diode in series, and an IGBT is connected between the inductor and the diode; the rear-stage circuit consists of six bridge arms, the first two bridge arms are formed by connecting an upper bridge arm IGBT and a lower bridge arm IGBT in series, the second four bridge arms are formed by connecting an upper bridge arm diode and a lower bridge arm diode in series, the first two bridge arms and the second four bridge arms are connected through a resonant inductor, a blocking capacitor and a high-frequency transformer, and the front-stage circuit and the rear-stage circuit are connected in parallel through two capacitors.
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| CN201911339790.5A CN111106644A (en) | 2019-12-23 | 2019-12-23 | Power supply control method and power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112769328A (en) * | 2020-12-31 | 2021-05-07 | 潍柴动力股份有限公司 | Voltage conversion apparatus and method applied to vehicle |
| CN114257087A (en) * | 2021-12-22 | 2022-03-29 | 中船重工黄冈水中装备动力有限公司 | Constant-current power supply device and balance control method thereof |
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