CN113179041B - Efficient pulse width modulation method of energy storage system - Google Patents
Efficient pulse width modulation method of energy storage system Download PDFInfo
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- CN113179041B CN113179041B CN202110394353.4A CN202110394353A CN113179041B CN 113179041 B CN113179041 B CN 113179041B CN 202110394353 A CN202110394353 A CN 202110394353A CN 113179041 B CN113179041 B CN 113179041B
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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
- 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
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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Abstract
The invention provides a high-efficiency pulse width modulation method of an energy storage system, which can effectively reduce power loss and improve the overall working efficiency of the system; after the power is on, the energy storage system starts the ADC interrupt sampling processing module to sample the mains supply, and the energy storage system is controlled by locking the mains supply voltage in phase; the ADC interruption sampling processing module judges whether the AC instantaneous voltage is smaller than a set value in real time, if so, the ADC interruption sampling processing module sends sampling data to the interruption loop control module for data processing, sends a response instruction to the interruption modulation control module, judges that the circulation path of the current follow current loop is selected to go through the pulse width modulation mode of the switch device body, and if not, the ADC interruption sampling processing module controls the circulation path of the current follow current loop to go through the pulse width modulation mode of the switch device body diode in the energy storage system.
Description
Technical Field
The invention relates to the technical field of pulse width modulation, in particular to a high-efficiency pulse width modulation method of an energy storage system.
Background
At present, the new energy industry is developing rapidly, and in order to make the best use of energy and improve the utilization ratio of energy, often will be equipped with energy storage system, and to energy storage system, no matter charge energy storage work or discharge during operation, whole charge-discharge current all will flow through respective switching device to cause switching device current stress big, the big equal power loss of conduction loss, make the whole work efficiency of system reduce.
Disclosure of Invention
In order to solve the problems, the invention provides a high-efficiency pulse width modulation method of an energy storage system, which can effectively reduce power loss and improve the overall working efficiency of the system.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the energy storage system comprises a topology circuit module, an ADC interrupt sampling processing module, an interrupt loop control module and an interrupt modulation control module which are sequentially connected, wherein the topology circuit module comprises a plurality of switching devices, and the switching devices are connected with the interrupt modulation control module;
the ADC interrupt sampling processing module is used for sampling voltage and current in real time for the topological circuit module;
The interrupt loop control module is used for receiving and processing the sampling data of the ADC interrupt sampling processing module and then sending a real-time instruction to the interrupt modulation control module;
the interruption modulation control module is used for controlling the on-off of the switching element so as to realize pulse width modulation (SPWM) control;
the method is characterized in that: the pulse width modulation method comprises the following steps:
s1, after the power is turned on, the energy storage system starts the ADC interrupt sampling processing module to sample the mains supply, and the energy storage system is controlled by phase locking of the mains supply voltage;
and S2, the ADC interruption sampling processing module judges whether the alternating current instantaneous voltage is smaller than a set value in real time, if so, the ADC interruption sampling processing module sends sampling data to the interruption loop control module for data processing, sends a response instruction to the interruption modulation control module, judges that the circulation path of the current follow current loop is selected to go through the pulse width modulation mode of the switch device body, and if not, the circulation path of the current follow current loop is switched to go through the pulse width modulation mode of the switch device body diode in the energy storage system under the control of the interruption modulation control module.
It is further characterized in that:
the topological circuit module further comprises inductors L1, L2, direct current DC, capacitors C1, C2 and alternating current power supply AC, and the switching devices are divided into switching tubes S1, S2, S3, S4, S5 and S6;
the pulse width modulation method specifically comprises the following steps:
when the real-time value of the sampling alternating current instantaneous voltage of the ADC interruption sampling processing module is smaller than a set value, the inductors L1 and L2 are in a discharging follow current stage: the interruption modulation control module controls and adjusts the driving of the switching tube S5 to be complementary with the switching tube S1 and the switching tube S4 in high frequency, and current sequentially passes through the inductor L1, an alternating current power supply AC, the inductor L2, the switching tube S6 and the switching tube S5 body;
when the real-time value of the sampling alternating current instantaneous voltage of the ADC interruption sampling processing module is greater than a set value, the inductors L1 and L2 are in a discharging follow current stage: the interruption modulation control module controls the switching tube S1 and the switching tube S4 to be turned off, the switching tube S5 is turned off, and current sequentially passes through the inductor L1, the alternating current power supply AC, the inductor L2, the switching tube S6 and the body diode of the switching tube S5.
The invention has the advantages that the energy storage system can determine the current circulation path in a proper modulation mode in the working process, and realizes the automatic modulation mode adjustment, thereby achieving the purposes of reducing power loss and optimizing efficiency, having no need of investing extra hardware cost and having better economic use value.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic diagram of a circuit in an embodiment of the invention;
fig. 3 is a circuit schematic diagram of a current flow path during a charging energy storage phase of a positive half cycle of an AC power source according to an embodiment of the present invention;
fig. 4 is a circuit schematic diagram of a current flow path during a discharging freewheeling stage of a positive half-cycle of an AC power source according to an embodiment of the present invention;
fig. 5 is a waveform diagram of the AC power source AC over the entire period in the embodiment of the present invention.
Detailed Description
As shown in fig. 1, an efficient pulse width modulation method for an energy storage system is used for pulse width modulation of the energy storage system, the energy storage system includes a topology circuit module, an ADC interrupt sampling processing module 1, an interrupt loop control module 2, and an interrupt modulation control module 3, which are connected in sequence, the topology circuit module includes a plurality of switching devices, the interrupt modulation control module 3 adopts an existing SPWM control chip, and the interrupt loop control module 2 includes a phase-locked loop PLL, a PR controller, and a regulator PI;
the topological circuit module, the ADC interruption sampling processing module 1, the interruption loop control module 2 and the interruption modulation control module 3 in the energy storage system are all existing circuit modules, and a switch device is connected to the single chip microcomputer through the interruption modulation control module 3 to realize on-off control;
The ADC interrupt sampling processing module 1 is used for sampling voltage and current of the topological circuit module in real time;
the interrupt loop control module 2 is used for receiving and processing the sampling data of the ADC interrupt sampling processing module 1 and then sending a real-time instruction to the interrupt modulation control module 3;
the interrupt modulation control module 3 is used for controlling the on-off of the switching element so as to realize pulse width modulation (SPWM) control;
the pulse width modulation method comprises the following steps:
s1, after the power is on, the energy storage system starts the ADC to interrupt the sampling processing module 1 to sample the mains supply, and the energy storage system is controlled by locking the mains supply voltage in phase;
s2, the ADC interruption sampling processing module 1 judges whether the AC instantaneous voltage is smaller than a set value in real time, if so, the ADC interruption sampling processing module 1 sends the sampling data to the interruption loop control module 2 for data processing, sends a response instruction to the interruption modulation control module 3, judges whether the pulse width modulation mode of the current follow current loop for passing through the switch device body is selected, and if not, the interruption modulation control module 3 controls the current follow current loop to switch the pulse width modulation mode of the current follow current loop for passing through the switch device body diode in the energy storage system.
For clarity, as shown in fig. 2-5, the present invention is illustrated in a Heric circuit topology, and the present invention is also applicable to other circuit topologies such as H5, T-NPC, etc.
The following description is only given by the positive half cycle of the alternating current power supply AC, and the negative half cycle of the alternating current power supply AC is the same;
the topological circuit module illustrated by a Heric circuit topology comprises inductors L1, L2, switching tubes S1, S2, S3, S4, S5, S6, direct current DC, capacitors C1 and C2, and an alternating current power supply AC.
When the instantaneous ac voltage value | Uac | is smaller than the set value M, for example, M =300V, the interrupt modulation control module 3 controls and selects the pulse width modulation mode in which the circulation path of the current freewheeling circuit walks through the switching device body in the energy storage system, and records the mode as mode 1; as shown in fig. 3, in the positive half cycle of the AC power supply AC, the inductors L1 and L2 charge the energy storage stage: the switching tube S1 and the switching tube S4 are switched on at high frequency, the switching tube S2 and the switching tube S3 are switched off, the switching tube S5 is normally off, and the switching tube S6 is normally on, so that the inductors L1 and L2 store energy: the switching tube S1 is conducted with the switching tube S4, and the current sequentially passes through the direct current DC, the switching tube S1, the inductor L1, the alternating current power supply AC, the inductor L2 and the switching tube S4, so that the charging and energy storage work is completed;
as shown in fig. 4, the inductors L1 and L2 discharge freewheeling stage: the driving of the switch tube S5 is adjusted to be high frequency complementary with the switch tube S1 and the switch tube S4, so that during the discharging follow current period of the inductors L1 and L2, the current flows through the inductor L1, the alternating current power supply AC, the inductor L2, the switch tube S6 and the body of the switch tube S5 without the body diode of the switch tube S5 in sequence, so as to complete the discharging of the inductive follow current, and at this time, the loss of the switch tube S5 and the switch tube S6 in each half-wave period is mainly the switching loss.
When the instantaneous ac voltage value | Uac | is greater than the set value M, for example, M =300V, the current path of the current freewheeling loop is switched back to the pulse width modulation mode of the body diode of the switching device in the energy storage system, which is recorded as mode 2; as shown in fig. 3, in the positive half cycle of the AC power supply AC, the inductors L1 and L2 charge the energy storage stage: the switching tube S1 and the switching tube S4 are switched on at high frequency, the switching tube S2 and the switching tube S3 are switched off, the switching tube S5 is normally closed, and the switching tube S6 is normally open; then the inductors L1, L2 store energy: the switching tube S1 is conducted with the switching tube S4, and the current sequentially passes through the direct current DC, the switching tube S1, the inductor L1, the alternating current power supply AC, the inductor L2 and the switching tube S4, so that the charging and energy storage work is completed;
as shown in fig. 4, inductors L1, L2 discharge the freewheel phase: the switch tube S1 and the switch tube S4 are turned off, the switch tube S5 is turned off, and current sequentially passes through an inductor L1, an alternating current power supply AC, an inductor L2, a switch tube S6 and a switch tube S5 body diode, so that the inductive follow current discharge is completed; at this time, the loss of the switch tube S5 and the switch tube S6 in each half-wave period is the product of the conduction voltage drop and the current flowing through the switch tube.
The invention can further improve the efficiency by simultaneously switching out two modulation modes in a half-wave period, and particularly, under the condition that the AC voltage and the current of an alternating current power supply are lower, the loss of the mode of the inductor flowing away from the body diode of the switching device is higher than that of the mode of the inductor flowing away from the body diode of the switching device directly, on the contrary, under the condition that the voltage and the current are higher, the modulation mode of the inductor flowing away from the body diode of the switching device has higher efficiency, and the wave generation is schematically shown in figure 5.
In summary, the efficient pulse width modulation method of the energy storage system of the present invention can achieve automatic modulation mode adjustment, once the system operation condition is detected to no longer meet the specific condition, that is, the energy storage system determines in real time whether the instantaneous ac voltage is smaller than the set value, the energy storage system will automatically switch the pulse width modulation mode, and the modulation mode will be adjusted in real time along with the detection of the energy storage system, so as to achieve the purpose of optimal efficiency. The invention can be applied to the energy field with higher requirement on system efficiency, in particular to products such as photovoltaic inverters, energy storage inverters, inversion alternating current power supplies and the like.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (3)
1. The energy storage system comprises a topological circuit module, an ADC interrupt sampling processing module, an interrupt loop control module and an interrupt modulation control module which are sequentially connected, wherein the topological circuit module comprises a plurality of switching devices, and the switching devices are connected with the interrupt modulation control module;
the ADC interrupt sampling processing module is used for sampling voltage and current of the topological circuit module in real time;
the interrupt loop control module is used for receiving and processing the sampling data of the ADC interrupt sampling processing module and sending a real-time instruction to the interrupt modulation control module;
the interruption modulation control module is used for controlling the on-off of the switching element so as to realize pulse width modulation (SPWM) control;
The method is characterized in that: the pulse width modulation method comprises the following steps:
s1, after the power is turned on, the energy storage system starts the ADC interrupt sampling processing module to sample the mains supply, and the energy storage system is controlled by locking the mains supply voltage in phase;
and S2, the ADC interruption sampling processing module judges whether the AC instantaneous voltage is smaller than a set value in real time, if so, the ADC interruption sampling processing module sends sampling data to the interruption loop control module for data processing, sends a response instruction to the interruption modulation control module, judges that the circulation path of the current follow current loop is selected to go through the pulse width modulation mode of the switch device body, and if not, the ADC interruption sampling processing module controls the interruption modulation control module to switch the circulation path of the current follow current loop to go through the pulse width modulation mode of the switch device body diode in the energy storage system.
2. The method of claim 1, wherein the method comprises: the topological circuit module further comprises inductors L1, L2, direct current DC, capacitors C1, C2 and alternating current power supply AC, and the switching devices are divided into switching tubes S1, S2, S3, S4, S5 and S6.
3. The method of claim 2, wherein the pulse width modulation method comprises: the pulse width modulation method specifically comprises the following steps:
When the real-time value of the sampling alternating current instantaneous voltage of the ADC interruption sampling processing module is smaller than a set value, the inductors L1 and L2 are in a discharging follow current stage: the interruption modulation control module controls and adjusts the driving of the switching tube S5 to be high-frequency complementary with the switching tube S1 and the switching tube S4, and current sequentially passes through the inductor L1, an alternating current power supply AC, the inductor L2, the switching tube S6 and the switching tube S5 body;
when the real-time value of the sampling alternating current instantaneous voltage of the ADC interruption sampling processing module is greater than a set value, the inductors L1 and L2 are in a discharging follow current stage: the interruption modulation control module controls the switch tube S1 and the switch tube S4 to be turned off, the switch tube S5 is turned off, and current sequentially passes through the inductor L1, the alternating current power supply AC, the inductor L2, the switch tube S6 and the switch tube S5 body diode.
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| CN114884337A (en) * | 2022-07-08 | 2022-08-09 | 深圳市高斯宝电气技术有限公司 | HERIC inverter circuit |
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Address after: No. 18, Ruipu Road, Suzhou Industrial Park, Suzhou City, Jiangsu Province, 215000 Patentee after: Jiangsu Ascite Energy Technology Co.,Ltd. Address before: 215123 Room 202, building 17, Northwest District, nanotechnology Park, 99 Jinjihu Avenue, Suzhou Industrial Park, Jiangsu Province Patentee before: JIANGSU ASHITE ENERGY TECHNOLOGY Co.,Ltd. |
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