CN108512240B - Current chopping control system of hybrid energy storage power supply - Google Patents
Current chopping control system of hybrid energy storage power supply Download PDFInfo
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- CN108512240B CN108512240B CN201810461658.0A CN201810461658A CN108512240B CN 108512240 B CN108512240 B CN 108512240B CN 201810461658 A CN201810461658 A CN 201810461658A CN 108512240 B CN108512240 B CN 108512240B
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
Abstract
The invention discloses a current chopping control system of a hybrid energy storage power supply, which comprises the hybrid energy storage power supply, a DC/AC inverter, a current threshold value detection module, a chopping control module, an inversion driving module and a bus voltage detection module, wherein the hybrid energy storage power supply passes throughThe DC/AC inverter supplies current to the load; the bus voltage detection detects the output bus voltage u of the hybrid energy storage power supplyhess(t) and transmitting to the chopping control module; the current domain value is detected to obtain the working current i (t) of the load and transmits the working current i (t) to the chopping control module; the chopping control module outputs bus voltage u according to the hybrid energy storage power supplyhess(t) driving the DC/AC inverter by the inversion driving module according to the working current i (t) required by the load. According to the invention, the current of the load is adjusted by a current chopping control method, the bus voltage value of the hybrid energy storage power supply is fully considered, the power supply of the power supply to the load is ensured, and the stable supply of the power and the energy of the load is satisfied by controlling the current of the hybrid energy storage power supply.
Description
Technical Field
The invention relates to a hybrid energy storage power supply control system, in particular to a current chopping control system of a hybrid energy storage power supply, which is suitable for the application occasion of stable power supply of a direct-current power supply.
Background
The hybrid energy storage power supply has the characteristics of high energy density, easiness in realizing power supply to a high-power load and the like, and has good prospects in application fields of electric automobiles, hybrid electric automobiles, fuel cell automobiles and the like.
Although the hybrid energy storage power supply has the above advantages, the parameters of the hybrid energy storage power supply are variable, and it is difficult to satisfy the supply of the load power and the energy at the same time.
In order to ensure that the hybrid energy storage power supply can meet the requirement of stable power supply of a load and consider the voltage constraint of the hybrid energy storage power supply, a current chopping control system needs to be designed aiming at the hybrid energy storage power supply.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects and provides a current chopping control system of a hybrid energy storage power supply, and by adopting the technical scheme of the invention, the output current of the hybrid energy storage power supply is controlled by switching on and switching off a DC/AC inverter to meet the power requirement of stable load, the voltage operation range of an output bus of the hybrid energy storage power supply is fully considered, the stable supply of the power and the energy of the load is met, the voltage of the output bus of the hybrid energy storage power supply is ensured to be in the safe operation range, the requirements of the system safety and the load power and the energy are met, the service life of the hybrid energy storage power supply is prolonged, and the current chopping control system is suitable for the application occasions of stable power supply of the.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a current chopping control system of a hybrid energy storage power supply, which comprises the hybrid energy storage power supply and a DC/AC inverter, and also comprises a current threshold value detection module, a chopping control module, an inversion driving module and a bus voltage detection module, wherein the hybrid energy storage power supply supplies current to a load through the DC/AC inverter; the bus voltage detection detects the output bus voltage u of the hybrid energy storage power supplyhess(t) and transmitting to the chopping control module; the current domain value is detected to obtain the working current i (t) of the load and transmits the working current i (t) to the chopping control module; the chopping control module outputs bus voltage u to the fed super capacitor banksu(t) processing the working current i (t) required by the load, and driving a DC/AC inverter through an inverter driving module; the processing rule set in the chopping control module is as follows:
(a) when the port voltage u of the hybrid energy storage power supplyhessmin<uhess(t) and when the working current i (t) required by the load is less than or equal to ihessmaxWhen the load needs working current i (t) is provided by the hybrid energy storage power supply ihessAnd (t) i (t), wherein the output signal of the chopping control module controls the DC/AC inverter to be switched on through the inversion driving module at the moment, and the output current i of the hybrid energy storage power supplyhess(t) rises rapidly when the output current i of the hybrid energy storage power supply riseshess(t) to i1During the operation, the output signal of the chopping control module controls the DC/AC inverter to be switched off through the inversion driving module, and the output current i of the hybrid energy storage power supplyhess(t) beginning to decay when the output current i of the hybrid energy storage power supplyhess(t) Decays to i2When the current is over; the DC/AC inverter is turned on again, and the working current of the load is kept stable at i in a current chopping mode2＜i(t)＜i1；
(b) When the output bus voltage u of the hybrid energy storage power supplyhess(t)＜uhessminWhen the power supply is in use, the DC/AC inverter is turned off, and the output current i of the hybrid energy storage power supply (1) ishess(t)＝0。
In the formula uhessminThe minimum voltage of the hybrid energy storage power supply; i.e. ihess(t) is the current output by the hybrid energy storage power supply; i (t) is the operating current of the load, i1Is the upper limit of the threshold value of the load, i2Is the threshold lower limit of the load; wherein u ishessminThe electrochemical performance of the hybrid energy storage power source is determined.
Furthermore, when the current required by the load dynamically changes, the current i of the hybrid energy storage power supply1And i2As a function of the current of the load.
Furthermore, the energy type working current required by the load is provided by a storage battery of the hybrid energy storage power supply, so that the long-time power utilization of the load is ensured; the required power type working current is provided by a super capacitor of the hybrid energy storage power supply, so that the short-time large current power consumption of the load is ensured, and the short-time large current is more than three times of the rated load current of the load.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) according to the current chopping control system of the hybrid energy storage power supply, the output current of the hybrid energy storage power supply is controlled through the switching-on and switching-off of the DC/AC inverter, the load current is enabled to operate within a threshold range, the stable supply of the hybrid energy storage power supply to the load power and energy is guaranteed, the output bus voltage operating range of the hybrid energy storage power supply is fully considered, the system safety and the stable requirement of load power supply are met, the service life of the hybrid energy storage power supply is prolonged, and the current chopping control system is suitable for the application occasion that the high-power load current is stable;
(2) according to the current chopping control system of the hybrid energy storage power supply, the chopping control module has the control rule on the DC/AC inverter, the safe operation range of the output bus voltage of the hybrid energy storage power supply is considered, the hybrid energy storage power supply is effectively protected, and the service life of the hybrid energy storage power supply is effectively prolonged under the condition that the requirements of load power and energy stability are met.
Drawings
Fig. 1 is a connection relationship diagram of a hybrid energy storage power supply current chopping control system according to the present invention.
The reference numerals in the schematic drawings illustrate: 1. a hybrid energy storage power supply; 2. a DC/AC inverter; 3. a load; 4. detecting a current threshold value; 5. a chopping control module; 6. an inversion driving module; 7. and detecting the bus voltage.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
As shown in fig. 1, in the current chopping control system for a hybrid energy storage power supply of the embodiment, the output current of the hybrid energy storage power supply is controlled by switching on and off of a DC/AC inverter to meet the requirements of stable power supply of load power and energy, and the output bus voltage operating range of the hybrid energy storage power supply is fully considered, so that the power supply of the hybrid energy storage power supply meets the stable requirements of the load, the system safety and the stable requirements of power supply of the load are met, the service life of the hybrid energy storage power supply is prolonged, and the current chopping control system is suitable for various occasions of stable direct current power supply.
The specific scheme is as follows:
the system comprises a hybrid energy storage power supply 1, a DC/AC inverter 2, a current threshold value detection 4, a chopping control module 5, an inversion driving module 6 and a bus voltage detection 7, wherein the hybrid energy storage power supply 1 supplies current to a load 3 through the DC/AC inverter 2; bus voltage detection 7 for detecting output bus voltage u of hybrid energy storage power supply 1hess(t) and transmitted to the chopper control module 5; the current threshold value detection 4 obtains the working current i (t) of the load 3 and transmits the working current i (t) to the chopping control module 5; the chopping control module 5 outputs bus voltage u to the fed super capacitor group 1su(t) processing the working current i (t) required by the load 3 and driving the DC/AC inverter 2 through the inversion driving module 6;
the control system can ensure that the load current is within a threshold value range and ensure the stability requirement of the load current. The current required by the load 3 is obtained through the current threshold value detection 4 and is transmitted to the chopping control module 5, the output bus voltage of the hybrid energy storage power supply 1 is obtained through the bus voltage detection 7 and is transmitted to the chopping control module 5, the chopping control module 5 controls the DC/AC inverter 2 through the inversion driving module 6 according to the output bus voltage of the hybrid energy storage power supply 1 and the steady-state current required by the load 3, and the hybrid energy storage power supply 1 provides the steady-state current for the load 3 through the DC/AC inverter 2;
the control rule set in the chopping control module 5 is as follows:
(a) when the port voltage u of the hybrid energy storage power supply 1hessmin<uhess(t) and when the working current i (t) required by the load 3 is less than or equal to ihessmaxWhen the load 3 needs working current i (t) provided by the hybrid energy storage power supply 1, i.e. ihessAnd (t) i (t), at this time, the output signal of the chopping control module 5 controls the DC/AC inverter 2 to be switched on through the inversion driving module 6, and the output current i of the hybrid energy storage power supply 1hess(t) rises rapidly when the output current i of the hybrid energy storage power supply 1hess(t) to i1During the operation, the output signal of the chopping control module 5 controls the DC/AC inverter 2 to be switched off through the inversion driving module 6, and the output current i of the hybrid energy storage power supply 1hess(t) begins to decay when the output current i of the hybrid energy storage power supply 1hess(t) attenuation to i2When the current is over; the DC/AC inverter 2 is turned on again, and the working current of the load is kept stable at i in a current chopping mode2＜i(t)＜i1；
(b) When the output bus voltage u of the hybrid energy storage power supply 1hess(t)＜uhessminWhen the power supply is started, the DC/AC inverter 2 is switched off, and the output current i of the hybrid energy storage power supply 1hess(t)＝0。
In the formula uhessminThe minimum voltage of the hybrid energy storage power supply 1; i.e. ihess(t) is the current output by the hybrid energy storage power supply 1; i (t) is the operating current of the load 3, i1Is the upper limit of the threshold value of the load 3, i2Is the threshold lower limit of load 3; wherein u ishessminAccording toThe electrochemical performance of the hybrid energy storage power source 1 is determined. Wherein the current i of the hybrid energy storage power supply changes when the current required by the load changes dynamically1And i2Varies with the current of the load; the energy type working current required by the load 3 is provided by the storage battery of the hybrid energy storage power supply 1, so that the long-time power consumption of the load 3 is ensured; the required power type working current is provided by a super capacitor of the hybrid energy storage power supply 1, and short-time large current power consumption of the load 3 is guaranteed, wherein the short-time large current is more than three times of rated load current of the load 3.
That is, in the present embodiment, when the output bus voltage of the hybrid energy storage power supply 1 is within the appropriate output bus voltage range and when the steady-state current required by the load 3 is smaller than the maximum current that the hybrid energy storage power supply 1 can output, the current required by the load 3 is supplied by the hybrid energy storage power supply 1, the DC/AC inverter is turned on at the start, the current rises rapidly, and the current reaches i when the current reaches i1When the DC/AC inverter is turned off, the current begins to decay, and when the current decays to i2When the DC/AC inverter is turned on again, the load working current is in i2And i1To (c) to (d);
when the output bus voltage of the hybrid energy storage power supply 1 is less than the minimum voltage, the DC/AC inverter 2 is turned off, the output current of the hybrid energy storage power supply 1 is zero, and the hybrid energy storage power supply 1 is effectively protected. The stable power supply of the power supply to the load is ensured, the system safety and the stable requirement of the load power supply are met, the service life of the hybrid energy storage power supply 1 is prolonged, and the hybrid energy storage power supply has a good application prospect in various stable direct-current high-power supply occasions.
According to the current chopping control system of the hybrid energy storage power supply, the current of the load is adjusted through the current chopping control method, the bus voltage value of the hybrid energy storage power supply is fully considered, the stable supply of the power supply to the load power and energy is ensured, the system safety and the stable requirement of the load power supply are met, the service life of the hybrid energy storage power supply is prolonged, and the current chopping control system is suitable for application occasions needing stable direct current power supply.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (1)
1. A hybrid energy storage power supply current chopping control system comprises a hybrid energy storage power supply (1) and a DC/AC inverter (2), and is characterized in that: the hybrid energy storage power supply further comprises a current threshold value detection (4), a chopping control module (5), an inversion driving module (6) and a bus voltage detection (7), wherein the hybrid energy storage power supply (1) supplies current to the load (3) through the DC/AC inverter (2), and the energy type working current required by the load (3) is supplied by a storage battery of the hybrid energy storage power supply (1), so that the long-time power consumption of the load (3) is ensured; the power type working current required by the load (3) is provided by a super capacitor of the hybrid energy storage power supply (1), so that the short-time large current power consumption of the load (3) is ensured, and the short-time large current is more than three times of the rated load current of the load (3); the bus voltage detection (7) detects the output bus voltage u of the hybrid energy storage power supply (1)hess(t) and transmitting to the chopping control module (5); the current threshold value detection (4) obtains the working current i (t) of the load (3) and transmits the working current i (t) to the chopping control module (5); the chopping control module (5) outputs bus voltage u to the fed super capacitor bank (1)su(t) processing the working current i (t) required by the load (3) and driving the DC/AC inverter (2) through the inversion driving module (6); the processing rules set in the chopping control module (5) are as follows:
(a) when the output bus voltage u of the hybrid energy storage power supply (1)hessmin<uhess(t) and when the working current i (t) required by the load (3) is less than or equal to ihessmaxWhen the load (3) needs working current i (t) is provided by the hybrid energy storage power supply (1), ihessAnd (t) i (t), wherein the output signal of the chopping control module (5) controls the DC/AC inverter (2) to be switched on through the inversion driving module (6), and the output current i of the hybrid energy storage power supply (1) ishess(t) rises rapidly when the output current i of the hybrid energy storage power supply (1) riseshess(t) to i1During the operation, the output signal of the chopping control module (5) controls the DC/AC inverter (2) to be switched off through the inversion driving module (6), and the output current i of the hybrid energy storage power supply (1)hess(t) beginning to decay when the output current i of the hybrid energy storage power supply (1) is reducedhess(t) attenuation to i2When the current is over; the DC/AC inverter (2) is turned on again, and the working current of the load is kept stable at i in a current chopping mode2＜i(t)＜i1；
(b) When the output bus voltage u of the hybrid energy storage power supply (1)hess(t)＜uhessminWhen the power supply is in use, the DC/AC inverter (2) is turned off, and the output current i of the hybrid energy storage power supply (1) ishess(t)＝0；
In the formula uhessminThe minimum voltage of the hybrid energy storage power supply (1); i.e. ihess(t) is the current output by the hybrid energy storage power supply (1); i (t) is the operating current of the load (3), i1Is the upper limit of the threshold value of the load (3), i2Is the threshold lower limit of the load (3); wherein u ishessminAccording to the electrochemical performance of the hybrid energy storage power supply (1), when the current required by the load (3) dynamically changes, the current i of the hybrid energy storage power supply (1) is determined1And i2Varies with the current of the load (3).
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