CN111416404B - Constant-current control method of cascaded high-voltage constant-current power supply based on battery energy storage - Google Patents
Constant-current control method of cascaded high-voltage constant-current power supply based on battery energy storage Download PDFInfo
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- CN111416404B CN111416404B CN202010222609.9A CN202010222609A CN111416404B CN 111416404 B CN111416404 B CN 111416404B CN 202010222609 A CN202010222609 A CN 202010222609A CN 111416404 B CN111416404 B CN 111416404B
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
Abstract
A constant current control method of a cascade high-voltage constant current power supply based on battery energy storage is characterized in that loop current is controlled through a constant current control module of the power supply, a calculated battery cascade time sequence is transmitted to a battery time sequence issuing module, the battery time sequence issuing module issues the battery cascade time sequence to a battery cascade boosting module, and the battery cascade boosting module receives the battery cascade time sequence and controls the conduction sequence of batteries as the conduction time sequence of an IGBT switch connected with each stage of batteries in series. The constant current control module monitors the actual charging current of the load capacitor module fed back by the load capacitor current detection feedback module in real time, compares the actual charging current with the theoretical current, and shifts the battery time sequence forward when the actual current fed back by the load capacitor current detection feedback module is larger than the theoretical current calculated by the constant current control module; and when the actual current fed back by the load capacitor current detection feedback module is smaller than the theoretical current calculated by the constant current control module, the battery time sequence is shifted backwards.
Description
Technical Field
The invention relates to a constant current control method of a power supply.
Background
The battery energy storage cascaded high-voltage constant-current power supply gets rid of power supply system interference caused by large-amplitude surge and lower limit of power grid voltage, so that the application of the battery energy storage cascaded high-voltage constant-current power supply in field operation is greatly improved, the voltage cascaded by batteries can reach megawatt level based on high energy density of battery energy storage, the output power of the high-voltage constant-current power supply is greatly improved, and the constant current control of the power supply is the basis for realizing stable operation of the system, so that the research of the battery energy storage based cascaded high-voltage constant-current power supply constant current control method has important significance.
The constant current control research of the cascade High-voltage constant current power supply based on battery energy storage is increasingly wide, and the High-voltage High-frequency changing power supplied on voltage feedback and phase-shift control of the Liukun are the same by setting the interval time of battery pack input, so that the consistency of loop current after each stage of battery pack is ensured, and good experimental results are obtained. The method comprises the steps of carrying out current control by adopting a time sequence reconstruction method, namely, firstly, taking the maximum current reached by a first-stage battery pack connected in a loop as a reference, and selecting the moment as the time when the next battery pack is triggered when the maximum current maintained by the next battery pack triggered is still consistent with the maximum current which can be reached by the loop at the moment. The efficient energy transfer of the hybrid energy storage system is effectively completed through the implementation of the control strategy. The scholars generally think that the voltage of the battery is unchanged in the process of charging the capacitor, but the actual discharging curve of the battery changes in real time, the rule is that the discharging voltage changes greatly at the beginning and then gradually tends to be stable, aiming at the characteristic, a fixed voltage in each charging period can be taken as the charging voltage value, and then the timing sequence is changed through closed-loop control current detection to realize the fine adjustment of the battery input timing sequence, namely the constant-current correction control of the current is realized.
Disclosure of Invention
The invention aims to provide a constant current control method of a battery energy storage cascade type high-voltage constant-current power supply. The problem of loop current fluctuation caused by battery voltage change is solved.
The battery energy storage cascade high-voltage constant-current power supply takes the battery as primary energy, and the battery is cascaded according to time sequence, so that the load capacitor module can be continuously charged in a short time, and the aim of approximate constant current is fulfilled.
The high-voltage constant-current power supply comprises:
the device comprises a battery cascade boosting module, a load capacitor current detection feedback module, a constant current control module and a battery time sequence issuing module.
The input end of the battery cascade boosting module is connected with the output end of the battery time sequence issuing module, the output end of the battery cascade boosting module is connected with the input end of the load capacitor module, the output end of the load capacitor is connected with the input end of the load capacitor current detection feedback module, the output end of the load capacitor current detection module is connected with the input end of the constant current control module, and the output end of the constant current control module is connected with the input end of the battery time sequence issuing module.
The battery cascade boosting module charges the load capacitor module through a plurality of battery charging modules which are cascaded;
the load capacitor current detection feedback module collects the current of the load capacitor module through a Hall element, converts the current into a current frequency signal through a V/f converter, and feeds the current frequency signal back to the constant current control module through an optical fiber;
the constant current control module controls the current of the battery loop through a battery cascade time sequence, and the battery cascade time sequence algorithm is as follows: and traversing all the moments after the moment in sequence from the moment when the nth-level battery cascade is connected into the loop, solving the loop current of the (n + 1) th-level battery cascade connection at the moment until the current peak value of the loop current is equal to the set current threshold, saving the moment as the moment when the (n + 1) th-level battery cascade connection is performed, and starting the next cycle. The constant current control module transmits the calculated battery cascade time sequence to the battery time sequence issuing module, the battery cascade time sequence issuing module issues the battery cascade time sequence to the battery cascade boosting module, and the battery cascade boosting module receives the battery cascade time sequence and serves as the conduction time sequence of the IGBT switch connected in series with each stage of batteries, so that the conduction sequence of the batteries is controlled, the loop current does not exceed a current threshold all the time, and the approximately constant current control is realized.
The constant current control module monitors the actual charging current of the load capacitor module fed back by the load capacitor current detection feedback module in real time, and compares the actual charging current with the theoretical current, so that the battery time sequence is moved forwards or backwards. The method specifically comprises the following steps:
when the actual charging current of the load capacitor module fed back by the load capacitor current detection feedback module is greater than the theoretical current calculated by the constant current control module, advancing the battery cascade time sequence, specifically advancing the actual current-the theoretical current-m by 0.1s when m is 10A; wherein m is an integer, m is more than or equal to 0, A is ampere, and s is second.
When the actual charging current of the load capacitor module fed back by the load capacitor current detection feedback module is smaller than the theoretical current calculated by the constant current control module, the battery cascade time sequence is shifted backwards, and specifically, when the theoretical current-the actual current is m × 10A, the battery cascade time sequence is shifted backwards by m × 0.1 s; wherein m is an integer, m is more than or equal to 0, A is ampere, and s is second.
The invention is realized by changing the time sequence in the constant-current control module, and can effectively solve the problem of loop current fluctuation caused by the voltage change of the battery.
Drawings
FIG. 1 is a block diagram of a cascaded high-voltage constant-current power supply based on battery energy storage according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of an embodiment of a battery energy storage based cascaded high voltage constant current power supply of the present invention;
fig. 3 is a flowchart of another embodiment of a constant current control method according to the present invention.
Detailed Description
The following further describes some aspects with reference to the drawings and detailed description.
The invention relates to a battery energy storage-based constant current control method for a cascaded high-voltage constant current power supply, which comprises the steps of transmitting a corresponding time sequence to a cascaded battery through a battery time sequence issuing module, controlling a battery cascade boosting module to charge a load capacitor module, detecting real-time current of a capacitor by a load capacitor current detection feedback module, transmitting the real-time current to a constant current control module to realize time sequence adjustment, and then issuing the adjusted time sequence to the battery time sequence issuing module. The constant current control is realized by changing the timing in the constant current control module.
As shown in fig. 1, the structure of the battery energy storage-based cascaded high-voltage constant-current power supply of the invention is as follows:
the power supply comprises a battery cascade boosting module, a load capacitor current detection feedback module, a constant current control module and a battery time sequence issuing module;
the input end of the battery cascade boosting module is connected with the output end of the battery time sequence issuing module, the output end of the battery cascade boosting module is connected with the input end of the load capacitor module, the output end of the load capacitor is connected with the input end of the load capacitor current detection feedback module, the output end of the load capacitor current detection module is connected with the input end of the constant current control module, and the output end of the constant current control module is connected with the input end of the battery time sequence issuing module;
fig. 2 shows a circuit diagram of the power supply.
In the circuit diagram of the power supply, as shown in FIG. 2, a battery E1-En、IGBT S1-SnDiode D1-DnThe inductor L and the resistor R form a battery cascade connection boosting module. Wherein the battery E1First and IGBT S1Connected in series and then connected with a diode D1The battery charging modules are connected in parallel to form a first-stage battery charging module, and the battery charging modules of other stages are also formed in a connection mode. The n battery charging modules are cascaded and are finally connected with the inductor L and the resistor R in series to form the battery cascade boosting module. Wherein n is an integer and has a value range of 1-20.
The load capacitor module includes a capacitor C. The capacitor C is connected in series with the battery cascade boosting module.
IGBT S1-SnControl of battery E by switching action1-EnThe time of the series circuit, thus producing a different current that charges the capacitor C of the load capacitor module through the inductor L and the resistor R.
Fig. 3 shows a flow of a constant current control charging method according to an embodiment of the present invention, as shown in fig. 3:
the constant current control module monitors the actual charging current of the load capacitor module fed back by the load capacitor current detection feedback module in real time, and compares the actual charging current of the load capacitor module with the theoretical current, so that the battery time sequence is moved forwards or backwards. The method specifically comprises the following steps:
when the actual current fed back by the load capacitor current detection feedback module is greater than the theoretical current calculated by the constant current control module, advancing the battery cascade time sequence, specifically advancing the actual current-the theoretical current (m × 10A) by m × 0.1 s; wherein m is an integer, m is more than or equal to 0, A is ampere, and s is second.
When the actual current fed back by the load capacitor current detection feedback module is smaller than the theoretical current calculated by the constant current control module, the battery cascade time sequence is shifted backwards, and specifically, when the theoretical current-the actual current is m × 10A, the battery cascade time sequence is shifted backwards by m × 0.1 s; wherein m is an integer, m is more than or equal to 0, A is ampere, and s is second.
Claims (1)
1. A constant current control method for a cascade high-voltage constant current power supply based on battery energy storage is disclosed, wherein the high-voltage constant current power supply comprises the following steps:
the device comprises a battery cascade boosting module, a load capacitor current detection feedback module, a constant current control module and a battery time sequence issuing module;
the input end of the battery cascade boosting module is connected with the output end of the battery time sequence issuing module, the output end of the battery cascade boosting module is connected with the receiving end of the load capacitor module, the output end of the load capacitor is connected with the receiving end of the load capacitor current detection feedback module, the output end of the load capacitor current detection module is connected with the receiving end of the constant current control module, and the output end of the constant current control module is connected with the input end of the battery time sequence issuing module;
the battery cascade boosting module charges the load capacitor module through a plurality of battery charging modules which are cascaded;
the load capacitor current detection feedback module collects the current of the load capacitor module through a Hall element, converts the current into a current frequency signal through a V/f converter, and feeds the current frequency signal back to the constant current control module through an optical fiber,
the method is characterized in that:
the constant current control module controls loop current, and transmits a battery cascade time sequence obtained by calculation to the battery time sequence issuing module, the battery time sequence issuing module issues the battery cascade time sequence to the battery cascade boosting module, and the battery cascade boosting module receives the battery cascade time sequence and controls the conduction sequence of the batteries as the conduction time sequence of an IGBT switch connected in series with each stage of batteries;
the constant current control module monitors the actual charging current of the load capacitor module fed back by the load capacitor current detection feedback module in real time, compares the actual charging current with the theoretical current, and shifts the battery time sequence forward when the actual current fed back by the load capacitor current detection feedback module is greater than the theoretical current calculated by the constant current control module; when the actual current fed back by the load capacitor current detection feedback module is smaller than the theoretical current calculated by the constant current control module, the battery time sequence is shifted backwards;
when the actual charging current of the load capacitor module fed back by the load capacitor current detection feedback module is greater than the theoretical current calculated by the constant current control module, namely the actual current-the theoretical current is m × 10A, the forward battery cascade time sequence is m × 0.1 s;
when the actual charging current of the load capacitor module fed back by the load capacitor current detection feedback module is smaller than the theoretical current calculated by the constant current control module, namely the theoretical current-actual current is m × 10A, the cascade time sequence of the backward-moving battery is m × 0.1 s; wherein m is an integer, m is more than or equal to 0, A is ampere, and s is second.
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| KR100848297B1 (en) * | 2007-12-24 | 2008-07-25 | (주)시그넷시스템 | Charging device |
| JP2011135657A (en) * | 2009-12-22 | 2011-07-07 | Sanyo Electric Co Ltd | Battery system and vehicle with the same, and method for detecting current limit state of the battery system |
| CN102694411A (en) * | 2012-05-29 | 2012-09-26 | 邵振翔 | Digital control method and device for realizing constant-current charge of capacitor |
| CN103616559A (en) * | 2013-12-17 | 2014-03-05 | 北京国电通网络技术有限公司 | Battery voltage acquisition system and cascade system |
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