CN113922462B - Floating charge control method applied to energy storage converter and based on feedforward control - Google Patents
Floating charge control method applied to energy storage converter and based on feedforward control Download PDFInfo
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- CN113922462B CN113922462B CN202111261658.4A CN202111261658A CN113922462B CN 113922462 B CN113922462 B CN 113922462B CN 202111261658 A CN202111261658 A CN 202111261658A CN 113922462 B CN113922462 B CN 113922462B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000007600 charging Methods 0.000 claims abstract description 42
- 238000010280 constant potential charging Methods 0.000 claims description 6
- JXASPPWQHFOWPL-UHFFFAOYSA-N Tamarixin Natural products C1=C(O)C(OC)=CC=C1C1=C(OC2C(C(O)C(O)C(CO)O2)O)C(=O)C2=C(O)C=C(O)C=C2O1 JXASPPWQHFOWPL-UHFFFAOYSA-N 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 3
- 238000010277 constant-current charging Methods 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- BDJZCCWUSOZUQG-UHFFFAOYSA-N 2,4-dichloro-1-fluorobenzene Chemical compound FC1=CC=C(Cl)C=C1Cl BDJZCCWUSOZUQG-UHFFFAOYSA-N 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 2
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Classifications
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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Abstract
A floating charge control method based on feedforward control applied to an energy storage converter relates to the technical field of energy storage converter control, solves the problem that charging current or power suddenly changes when the energy storage converter is charged at the tail end of a battery and is changed from constant power charging or constant current charging into floating charging, and comprises an outer ring controller I, an outer ring controller II and an inner ring controller, wherein the output ends of the outer ring controller I and the outer ring controller II are respectively connected with the inner ring controller, and a feedforward control signal is introduced into an outer ring control loop charged at constant voltage, and is an output signal of the outer ring controller I at the moment before a floating charge mark is set; the feedforward control signal of the outer loop controller I is added with the output of the outer loop controller II to be used as an input reference current signal of the inner loop controller; the feedforward control is used for realizing the switching of the floating charge function, so that the abrupt change of the charging current or the power of the battery at the moment of switching can be avoided, and the smooth switching of the floating charge mode is realized.
Description
Technical Field
The invention relates to the technical field of energy storage converter control, in particular to a floating charge control method based on feedforward control, which is applied to an energy storage converter.
Background
When the energy storage converter charges the battery, the energy storage converter firstly works in a constant power mode or a constant current mode, in this way, the battery is charged quickly, the battery voltage slowly rises until the highest allowable charging voltage, and if the energy storage converter does not have a floating charging function at the moment, the charging is stopped next. According to the charging characteristic curve of the battery, after stopping charging, the battery terminal voltage slowly drops, which indicates that the capacity is not full. Therefore, when the energy storage converter charges the battery to the highest charging voltage in the constant power mode or the constant current mode, the battery may still have a small residual capacity, and thus it is necessary to implement the floating charging function.
The floating charging function is to charge with a constant voltage, and when the energy storage converter charges the battery voltage to the highest charging voltage (or floating charging voltage) in a constant power mode or a constant current mode, the energy storage converter is switched to the floating charging mode, and at the moment, the battery is charged with a constant voltage value, namely the floating charging voltage. In the float mode, the ideal state is a smooth switching of the charging mode, and the charging current gradually decreases until it approaches 0 (0 is not reached, and balance with the loss of the energy storage converter and the battery itself is needed), at which time the battery is actually fully charged. The energy storage converter is then shut down, and the terminal voltage of the battery cluster is maintained in a relatively stable state (the internal resistance loss of the battery cluster is reduced very slowly). This is the ideal whole charging process.
Disclosure of Invention
In order to solve the problems, the invention provides a floating charge control method based on feedforward control, which is applied to an energy storage converter, and solves the problem that charging current or power suddenly changes when the energy storage converter is changed from constant power charging or constant current charging to floating charging (namely constant voltage charging) at the tail end of charging a battery. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the floating charge control method based on feedforward control applied to the energy storage converter comprises an outer ring controller I, an outer ring controller II and an inner ring controller, wherein the output ends of the outer ring controller I and the outer ring controller II are respectively connected with the inner ring controller, and the floating charge control method comprises the following steps:
1) The energy storage converter is charged by a battery in a constant power or constant current mode at the beginning, an input reference current signal of the inner ring controller is generated by adopting the outer ring controller I, and when the voltage of the battery gradually rises and reaches a preset floating charge voltage target value, a floating charge flag is set;
2) After the floating charging sign is set, the energy storage converter is switched to a floating charging mode, namely constant voltage charging, and an outer ring controller II is used;
3) Introducing a feedforward control signal in an outer loop control loop charged by constant voltage, wherein the feedforward control signal is an output signal of an outer loop controller I at the moment before a floating charge mark is set;
4) The feedforward control signal of the outer loop controller I is added to the output of the outer loop controller II as the input reference current signal of the inner loop controller.
Further, the reference signal of the outer ring controller I is P ref or I DCref, which respectively represents the power reference command and the direct current reference command, the feedback signal is P fb or I DCfb, which represents the actual power and direct current of the energy storage converter, the difference value between the reference signal and the feedback signal is used as the input signal of the outer ring controller I, the output signal of the outer ring controller I is I ref1, and when the floating flag bit is not set, I ref1 is selected as the reference current I ref of the inner ring controller, so as to control the inner ring and generate the final modulation signal and the driving signal of the IGBT.
Further, a floating charge flag is set, the energy storage converter is switched to a floating charge mode, an outer ring controller II is used, a reference signal of the outer ring controller II is U DCref, a floating charge voltage target value is represented, a feedback signal is U DCfb, an actual direct current side bus voltage of the energy storage converter is represented, a difference value between the reference signal and the feedback signal is used as an input signal of the outer ring controller II, and an output signal of the outer ring controller II is not directly used as an input reference current signal of the inner ring controller.
Further, a feedforward control signal I ref1(t0-1) is introduced into the outer loop control loop charged by constant voltage, the signal is an output signal of the outer loop controller I at a time before the floating charge flag is set, and is also an input reference current signal of the inner loop at a time before the floating charge mode is switched, the feedforward control signal I ref1(t0-1) and the output of the outer loop controller ii are added to form a signal I ref2, and after the floating charge flag is set (at a time t 0), the signal is selected as the input reference current signal I ref of the inner loop controller.
Compared with the prior art, the invention has the following beneficial effects: the feedforward control is used for realizing the switching of the floating charge function, so that the abrupt change of the charging current or the power of the battery at the moment of switching can be avoided, and the smooth switching of the floating charge mode is realized.
Drawings
The present invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the controller assembly and feedforward signal of the present invention;
FIG. 2 is a simulation result of battery terminal voltage and charging current and charging power in a conventional method of direct switching in a float mode;
fig. 3 is a simulation result of battery terminal voltage, charging current and charging power during mode switching by adopting the floating charge control method based on feedforward control.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the floating charge control method based on feedforward control applied to the energy storage converter comprises an outer ring controller I, an outer ring controller II and an inner ring controller, wherein the output ends of the outer ring controller I and the outer ring controller II are respectively connected with the inner ring controller, and the floating charge control method comprises the following steps:
The energy storage converter is charged by taking a constant power or constant current mode as a battery at the beginning, an outer ring controller I is adopted to generate an input reference current signal of an inner ring controller, the reference signal of the outer ring I is P ref or I DCref, the reference signal of the outer ring I is respectively used for representing a power reference instruction and a direct current reference instruction, the feedback signal is P fb or I DCfb, the actual power and direct current of the energy storage converter are represented, the difference value of the reference signal and the feedback signal is used as the input signal of the outer ring controller I, the output signal of the outer ring controller I is I ref1, and when a floating charge flag bit is not set, I ref1 is selected as the reference current I ref of the inner ring controller, the inner ring is controlled, and a final modulation signal and a driving signal of the IGBT are generated.
When the battery voltage gradually rises and reaches a preset floating charge voltage target value, a floating charge flag is set, the energy storage converter is switched to a floating charge mode, namely constant voltage charging, an outer ring controller II is used, a reference signal of an outer loop II is U DCref and represents the floating charge voltage target value, a feedback signal is U DCfb and represents the actual direct current side bus voltage of the energy storage converter, the difference value of the reference signal and the feedback signal is used as an input signal of the outer ring controller II, and an output signal of the outer ring controller II is not directly used as an input reference current signal of the inner ring controller.
In an outer loop control loop charged by constant voltage, a feedforward control signal I ref1(t0-1) is introduced, wherein the feedforward control signal is an output signal of the outer loop controller I at the moment before a floating charge mark is set, and is an inner loop input reference current signal at the moment before the floating charge mode is switched. The feedforward signal is added to the output of the outer loop controller ii to form signal I ref2, which is then selected as the input reference current signal I ref for the inner loop controller after the float flag is set (time t 0).
According to classical control theory, feedforward control is an open loop control method, and has the advantages of high response speed and fast acting on a controlled object. Therefore, the feedforward control is used for realizing the switching of the floating charge function, and abrupt change of the charging current or power of the battery at the moment of switching can be avoided, so that the smooth switching of the floating charge mode is realized.
Setting up a simulation model of an energy storage system in MATLAB/Simulink, simulating the energy storage converter to charge a battery in a constant power or constant current mode at the beginning, switching the energy storage converter to a floating charge mode when the voltage of the battery gradually rises and reaches a preset floating charge voltage target value, namely constant voltage charging, switching the floating charge mode by adopting the method provided by the invention, and comparing the result with the result of adopting the traditional direct switching method of the floating charge mode to obtain the result shown in figures 2 and 3. The simulation parameters are shown in table 1.
TABLE 1
| Rated voltage of energy storage converter | 690V |
| Rated frequency | 50Hz |
| Rated charge-discharge power | 1.25MW |
| DC side voltage range | 1100~1400V |
| Float voltage target value | 1400V |
Fig. 2 is a simulation result of the battery terminal voltage and the charging current and the charging power in the conventional method of direct switching in the float mode. At the instant of the float switch, since the output of the voltage outer loop controller 2 is 0, the current reference signal of the inner loop is also 0, resulting in the instant decrease of the actual charging current, then the current rises rapidly due to the action of the controller, and then the charging current gradually decreases along with the decrease of the remaining capacity of the battery, and the direct current voltage is maintained at the float voltage 1400V.
Fig. 3 is a simulation result of battery terminal voltage, charging current and charging power during mode switching by adopting the floating charge control method based on feedforward control. At the moment of floating charge switching, the feedforward quantity is superimposed on the output of the voltage outer ring controller II, and the feedforward quantity is the output of the outer ring controller I at the moment just before the floating charge mode switching, namely the inner ring current reference signal at the moment before the floating charge mode switching, so that the current reference signal of the inner ring gradually decreases along with the output of the voltage outer ring controller II, the actual charging current also shows a gradually decreasing trend, the charging power also gradually decreases by 1.25MW, the floating charge mode smooth switching is realized, and the direct current voltage is always maintained at the floating charge voltage 1400V after the mode switching.
By using the technical scheme of the invention or under the inspired by the technical scheme of the invention, a similar technical scheme is designed by a person skilled in the art, so that the technical effects are achieved, and the technical effects fall into the protection scope of the invention.
Claims (3)
1. The floating charge control method based on feedforward control applied to the energy storage converter comprises an outer ring controller I, an outer ring controller II and an inner ring controller, wherein the output ends of the outer ring controller I and the outer ring controller II are respectively connected with the inner ring controller, and the floating charge control method is characterized by comprising the following steps:
Step 1) charging a battery by using a constant power or constant current mode at the beginning of the energy storage converter, generating an input reference current signal of an inner ring controller by adopting an outer ring controller I, and setting a floating charge mark when the voltage of the battery gradually rises and reaches a preset floating charge voltage target value;
Step 2), after a floating charging sign is set, switching the energy storage converter into a floating charging mode, namely constant voltage charging, and using an outer ring controller II;
step 3) introducing a feedforward control signal in an outer loop control loop charged by constant voltage, wherein the feedforward control signal is an output signal of an outer loop controller I at the moment before a floating charge flag is set;
step 4), adding the feedforward control signal of the outer loop controller I and the output of the outer loop controller II to serve as an input reference current signal of the inner loop controller;
Step 3) and step 4) introduce a path of feedforward control signal into the constant voltage charging outer loop control loop The signal is the output signal of the outer ring controller I at the moment before the floating charge mark is set, and is also the input reference current signal of the inner ring at the moment before the floating charge mode is switched, and is a feedforward control signalAdded to the output of the outer loop controller II to form a signalAfter the float flag is set, the input reference current signal is selected as the inner loop controller。
2. The floating charge control method as set forth in claim 1, wherein the reference signal of the outer ring controller I in step 1) isOr (b)Respectively representing a power reference command and a direct current reference command, wherein the feedback signal is thatOr (b)The difference value of the reference signal and the feedback signal is used as the input signal of the outer ring controller I, and the output signal of the outer ring controller I isWhen the float flag is not set,Reference current selected as inner loop controllerThe control of the inner loop is performed and the final modulation signal and the drive signal of the IGBT are generated.
3. The floating charge control method according to claim 1, wherein step 2) the floating charge flag is set, the energy storage converter is switched to the floating charge mode, and an outer ring controller II is used, and a reference signal of the outer ring controller II isRepresenting the float voltage target value, the feedback signal isThe difference value of the reference signal and the feedback signal is used as the input signal of the outer ring controller II, and the output signal of the outer ring controller II is not directly used as the input reference current signal of the inner ring controller.
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| EP3177971B1 (en) * | 2014-08-08 | 2020-02-12 | Toyo System Co., Ltd. | Feedback control device |
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