CN107612328A - A kind of dc source digital current-sharing method in parallel - Google Patents
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Abstract
The invention discloses a kind of dc source digital current-sharing method in parallel, for two dc sources in parallel to be flowed, it is main frame to specify a dc source, and another dc source is slave, two dc sources are connected by CAN communication, and current equalizing method comprises the following steps：Host power supply gathers the output current value from electromechanical source；Output current value of the host power supply according to itself and the output current value from electromechanical source, using host and slave processors output current difference as the input quantity of sharing control, equal stream calculation is carried out using PI algorithms, obtains the adjustment amount of the output voltage of host power supply；The output voltage of regulation host power supply makes it change the adjustment amount；Remove two output current values；Above step is repeated, until the output current of two dc sources in parallel reaches balance.The digital current-sharing method of the present invention flows that transient response speed is fast, and control structure is simple, strong antijamming capability, enhances the reliability of parallel power supply system.
Description
Technical Field
The invention belongs to the technical field of power supply current sharing, and particularly relates to a digital current sharing method for parallel connection of direct-current power supplies.
Background
With the development and application of power electronic technology, the requirement of a power supply system on a high-power supply system is higher and higher, in the actual application process, the output power and reliability of a single direct-current power supply cannot meet the requirement of a user, and once the single power supply fails, the power supply system is paralyzed and cannot run. The parallel operation of a plurality of power supply modules can meet different output power requirements, the capacity of the power supply modules can be flexibly expanded according to actual requirements, the redundancy of a power supply system is easy to realize, the output of the whole power supply system still has enough load capacity after a certain module is damaged, and the reliability of the power supply system is improved.
However, in general, a plurality of power modules cannot be directly operated in parallel, and due to inconsistent power characteristics of the power modules, the modules with low voltage adjustment rate may bear large current or even overload, and the modules with high voltage adjustment rate may be operated under light load or even no load, so that the reliability of the power system is reduced, and the service life is shortened. In order to ensure that a multi-power module parallel system can stably and reliably operate, the output current of each power module must be ensured to be balanced.
The current main current sharing methods comprise an output impedance method, a master-slave setting method, an average current method, a maximum current method, an external current sharing controller method and the like, and under certain fixed scenes, the current sharing methods can achieve good current sharing effect; however, the output impedance method, the master-slave setting method, the average current method and the maximum current method all adopt analog control, once the control method and the coefficient are determined, the control method and the coefficient are solidified into hardware, and when an external use scene changes, a circuit has to be redesigned; the cost and the structural complexity of the additional current sharing controller are obviously not dominant, and the traditional current sharing method is difficult to solve the contradiction between the current sharing transient response speed and precision, the control flexibility and the structural complexity.
Disclosure of Invention
Aiming at the defects or the improvement requirements in the prior art, the invention provides a digital current sharing method for parallel connection of direct-current power supplies, which is based on a master-slave setting method in the traditional current sharing control method and adopts a current sharing scheme combining a PI algorithm and digital control; the digital current sharing method can improve the reliability of the whole power supply system and has higher transient response speed and precision.
In order to achieve the above object, according to an aspect of the present invention, there is provided a digital current sharing method for parallel connection of dc power supplies, configured to share current between two parallel dc power supplies, where one dc power supply a is arbitrarily designated as a master and the other dc power supply B is designated as a slave, and the two dc power supplies are connected through CAN communication, the digital current sharing method including the steps of:
(1) The master machine power supply A acquires the output current value IoutB of the slave machine power supply B;
(2) The master power supply A calculates the difference e (k) between the output current value IoutA of the master power supply A and the output current value IoutB of the slave power supply B, namely e (k) = IoutA-IoutB;
(3) Carrying out current sharing calculation by using a PI algorithm to obtain an adjustment quantity u (k) of the output voltage of the host power supply A, wherein the PI algorithm formula is as follows:
wherein,
u (k): the amount of adjustment of the output voltage of the host power supply a,
e (k): the difference value of the output current of the master power supply A and the slave power supply B at the k-th regulation,
k: the cumulative number of times the PI adjustment is made,
k p : ratio systemThe number of the first and second groups is,
k i : an integral coefficient;
(4) Adjusting the output voltage of the host power supply A to change the adjustment amount u (k);
(5) Clearing IoutA and IoutB;
(6) And (5) repeating the steps (1) to (5) until the output current value IoutA of the master power supply A and the output current value IoutB of the slave power supply B reach balance.
Preferably, the digital current sharing method further includes, between step (2) and step (3): the master power supply A judges whether e (k) exceeds a set threshold value of a difference value of output currents of the master power supply A and the slave power supply B, if so, the step (3) is carried out; if not, returning to the step (1).
Preferably, in the digital current sharing method, in the step (1), the master power supply a acquires the output current value IoutB of the slave power supply B through the AD sampling device according to the preset sampling period t.
Preferably, in the digital current sharing method, the AD sampling device employs a current sensor.
Preferably, in the digital current sharing method, the execution period T of the digital current sharing method is an integer multiple of the sampling period T.
Preferably, in the digital current sharing method, in the current sharing process, the master power supply a protects the output voltage, the output current and the temperature thereof, and if the output voltage exceeds the maximum voltage allowed to be output, or the output current exceeds the maximum current allowed to be output, or the temperature is higher than the maximum allowed temperature, the master power supply a shuts down and sends a CAN message shutdown instruction to the slave power supply B, and the slave power supply B shuts down.
Preferably, in the digital current sharing method, the slave power supply B protects the output voltage and temperature thereof during current sharing, and if the output voltage exceeds the maximum voltage allowed to be output or the temperature is higher than the maximum allowed temperature, the slave power supply B shuts down and sends a CAN message shutdown instruction to the host power supply a, and the host power supply a shuts down.
Preferably, in the digital current equalizing method, the two dc power supplies are digitally controlled by adopting a TMS320F28335DSP chip.
Preferably, in the digital current sharing method, the two dc power supplies are constant voltage power supplies with the same power.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) The digital current sharing method provided by the invention has a simple control structure, the current sensor has higher sampling rate, and the current sharing control by adopting the PI algorithm has higher regulation speed and higher control precision.
(2) The digital current equalizing method provided by the invention can solve the problems caused by aging and temperature drift of components under analog control, enhance the anti-interference capability and improve the reliability of a control system;
(3) The digital current sharing method provided by the invention has flexible control and strong universality, and can realize the upgrading of a control system by modifying software under the condition of hardly changing hardware.
Drawings
FIG. 1 is a flow chart of the operation of two DC power supplies provided by an embodiment of the present invention;
FIG. 2 is a digital current sharing algorithm for a first set and a second set of experiments provided by an embodiment of the present invention;
FIG. 3 is a flow chart of a current sharing method for a third set of experiments provided by the embodiments of the present invention;
FIG. 4 is a graph of current sharing effect of a first set of experiments provided by embodiments of the present invention;
FIG. 5 is a diagram illustrating the current sharing effect of the second set of experiments according to the embodiment of the present invention;
FIG. 6 is a diagram of the current sharing effect of the third set of experiments provided by the embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides a digital current sharing method, which solves the problem that load current is unevenly distributed among modules when two direct current power supply modules are connected in parallel; the two power supply modules adopt a digital control mode of a full-bridge phase-shift Pulse Width Modulation (PWM) switching power supply, a classic PI control strategy is adopted for output voltage control, a TMS320F28335DSP chip of TI semiconductor company is used as a control core, and sampling of output voltage and output current, CAN communication and generation of output PWM driving waveforms are achieved.
The embodiment provides a digital current sharing method when two power supply modules run in parallel, which is shown in fig. 1 and is a work flow chart of A, B two direct current power supplies, wherein a power supply a is designated as a master power supply, a power supply B is designated as a slave power supply, rated output voltages of the two power supplies are 28V, output currents are 50A, output currents of the two power supplies after being connected in parallel are 100A, the design requirement is that the two power supplies can bear 240A/50ms of impact, the two power supplies can quickly respond at the moment of the impact, and the output currents of the two modules can be balanced as soon as possible through a current sharing algorithm.
As shown in fig. 1, before performing the current sharing calculation, the two power modules need to perform the following steps: (1) The system is powered on, and DSP software and programs of the two power supply modules are initialized; (2) After initialization is completed, the two power supply modules perform power supply self-checking to detect whether the power supply state is normal or not; (3) After the self-checking is passed, the host power supply A reads a preset voltage value Vref and sends the Vref to the slave power supply B through CAN communication, and the slave power supply B receives a CAN command sent by the host power supply A and updates the output voltage value of the slave power supply B to be the Vref; (4) A, B power supply starts to execute slow start, the slave power supply B starts PWM output after sending a slow start completion command to the master power supply A, when the master power supply A starts to start PWM output after receiving the slow start completion command sent by the slave power supply B, the programs of A, B power supply are all run into the master cycle, and current sharing regulation starts to be executed;
in the embodiment, the CAN communication sending period and the AD sampling period are set to be 50us, the period for executing the current-sharing regulation of the power supplies A and B is set to be 500us, the current-sharing regulation period is integral multiple of the sampling period, and the specific multiple CAN be manually set according to required regulation precision.
The digital current sharing method of the present invention is illustrated by three sets of comparative experiments, wherein the current sharing methods of the first and second sets of experiments are shown in fig. 2.
The first set of test procedures:
1. the slave power supply B sends an output current value IoutB to the host power supply A through CAN communication;
2. the master power supply A receives a CAN interruption message sent by the slave power supply B, and obtains an average current value Iavg of the two power supplies according to an output current value IoutA of the master power supply A; iavg = (IoutA + IoutB)/2;
3. the host power supply A obtains a current difference value delta Ia according to the self output current value IoutA and the average current value Iavg, wherein the delta Ia = IoutA-Iavg;
4. adjusting the output voltage value of the main machine power supply A according to the current difference value delta Ia, wherein,
5. clearing IoutA and Iavg, and clearing a CAN receiving interrupt mark;
6. and (4) executing the steps 1 to 4 until the output current value of the A, B power supply reaches balance.
The second set of experimental steps:
1. the master machine power supply A acquires the output current value IoutB of the slave machine power supply B by using a current sensor;
2. after sampling is finished, the host power supply A obtains an average current value Iavg of the two power supplies according to the output current value IoutA of the host power supply A and the collected IoutB; iavg = (IoutA + IoutB)/2;
3. the host power supply A obtains a current difference value delta Ia according to the self output current value IoutA and the average current value Iavg, wherein the delta Ia = IoutA-Iavg;
4. the host power supply A adjusts the output voltage value thereof according to the current difference value delta Ia, wherein
5. Clearing IoutA and Iavg;
6. and (5) executing the steps 1 to 5 until the output current value of the A, B power supply reaches balance.
The flow equalization method of the third set of experiments is shown in fig. 3, and the experimental steps are as follows:
1. the master machine power supply A acquires the output current value IoutB of the slave machine power supply B through a current sensor;
2. after sampling is finished, the host power supply A calculates the difference e (k) = IoutA-IoutB of the output current value IoutA of the host power supply A and the output current value IoutB of the slave power supply B;
3. judging whether the | e (k) | is larger than 4A, if not, returning to the step 1; if yes, executing the next step;
4. and calculating the adjustment quantity u (k) of the output voltage of the host power supply A by using a PI algorithm, wherein the formula is as follows:
wherein,
u (k): the adjustment amount of the output voltage of the host power supply A;
e (k): the difference value of the output current of the master power supply A and the slave power supply B during the kth regulation;
k: the cumulative number of times the PI adjustment is made,
k p : a proportionality coefficient;
k i : an integral coefficient;
5. adjusting the output voltage of the host power supply A to change u (K);
6. clearing IoutA and IoutB;
7. and (5) repeating the step 1 to the step 6.
In order to avoid the influence of frequent current-sharing regulation on the stability of a system, the current-sharing regulation is required to be set to be executed when the output currents of the master power supply and the slave power supply are different by a certain value; in this embodiment, it is set that the current equalizing process is started when the absolute value of the difference between the output currents of the host power supply a and the slave power supply B is greater than 4A, i.e., | e (k) | > 4A.
In the current sharing process of the three experiments, the input and output voltage, the input and output current and the temperature of the master power supply A are protected, and the input and output voltage and the temperature of the slave power supply B are protected; and when the conditions of undervoltage, overvoltage, overcurrent and overtemperature occur, the alarm is started or the alarm is alarmed and the machine is shut down.
The current sharing effect graphs of the three experiments are shown in fig. 4, fig. 5 and fig. 6, and due to the experiment conditions, the change condition of the output current of the main power supply A is monitored only by using an oscilloscope in the experiments.
Fig. 4 is a current sharing effect diagram of a first set of experiments, and oscilloscope detection finds that a CAN communication transmission period, an adjustment range of an output voltage value of a master power supply a, and a threshold range of current sharing adjustment are appropriately modified, so that a better current sharing effect CAN be achieved for two power supply modules of the master power supply a and a slave power supply B, but at the moment of load loading, only one of the power supply modules bears most of current, and then an over-adjustment phenomenon is generated under the effect of current sharing, so that output currents of the two power supply modules of the master power supply a and the slave power supply B oscillate for a short time, and then the output currents of the two power supply modules gradually tend to balance. When the load impact is large (such as 200A), the power supply is damaged by the regulation, which easily causes the power supply module bearing large current to be damaged.
Fig. 5 is a current sharing effect diagram of the second set of experiments, which is compared with the first set of experiments, except that the ways of the host power supply a obtaining the output current value of the host power supply a are different, and the calculation methods of the current sharing process are the same. The AD sampling period in the experiment can reach 50us, so that the host power supply A can quickly perform current sharing judgment and calculation. The result shows that the second group of tests can quickly enable the two power supply modules of the master power supply A and the slave power supply B to reach a current sharing state, but the overshoot phenomenon is easy to occur within 1s of load loading, namely the output current values of the two modules are together with the oscillation of the output current of the two modules, and the oscillation is difficult to completely eliminate, so that the impact resistance of a power supply parallel system using the current sharing method is poor.
Fig. 6 is a current sharing effect diagram of the third set of experiments, and compared with the second set of experiments, the way for the master power supply a to obtain the output current value of the slave power supply B is the same, except that the calculation method of the current sharing process is different. The current loop PI algorithm is adopted in the experiment, ki and kp coefficients are adjusted, the current equalizing effect of the two power supply modules of the master power supply A and the slave power supply B is very good, especially at the moment of loading or unloading of a load, the output currents of the two power supply modules of the master power supply A and the slave power supply B are balanced, and the current equalizing state can be continuously kept.
When 190A load impact is applied to the system, the host power supply A responds and adjusts rapidly, the output current rises to 110A and then quickly falls to 94.4A to keep balance, no oscillation phenomenon occurs in the middle, the current equalizing effect can be achieved in time, the current equalizing state can be kept subsequently, and therefore the current equalizing effect of the master module and the slave module in the third group test is very good, and the current equalizing transient response speed and accuracy requirements are met. From the three groups of experiments, it can be seen that the introduction of the PI regulation method into the parallel current-sharing control of the direct-current power supply has feasibility and has a good effect on the transient response speed.
Compared with the current sharing method of the conventional power system, the parallel digital current sharing method of the direct-current power supply has higher transient response speed and accuracy, simple control structure and strong anti-interference capability, and can improve the reliability of the whole power system.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A digital current equalizing method for parallel connection of direct current power supplies is characterized in that one direct current power supply A is arbitrarily appointed as a host computer, the other direct current power supply B is an auxiliary computer, the two direct current power supplies are connected through a CAN bus, and the digital current equalizing method comprises the following steps:
(1) The method comprises the steps that a host power supply A acquires an output current value IoutB of a slave power supply B;
(2) The master power supply A calculates the difference e (k) = IoutA-IoutB of the output current value IoutA of the master power supply A and the output current value IoutB of the slave power supply B;
(3) Using PI algorithm to calculate current sharing to obtain the adjustment quantity of the output voltage of the host power supply A
Wherein,
u (k): the amount of adjustment of the output voltage of the host power supply a,
e (k): the difference value of the output current of the master power supply A and the slave power supply B at the k-th regulation,
k: the cumulative number of times the PI adjustment is made,
k p : the ratio coefficient of the ratio is,
k i : an integral coefficient;
(4) Adjusting the output voltage of the host power supply A to change the adjustment amount u (k);
(5) Clearing the output current value IoutA of the host machine and the output current value IoutB of the slave machine;
(6) And (5) repeating the steps (1) to (5) until the output current value IoutA of the master power supply A and the output current value IoutB of the slave power supply B reach balance.
2. The digital current sharing method according to claim 1, further comprising, between step (2) and step (3): judging whether e (k) exceeds a set threshold value of the difference value of the output currents of the master power supply A and the slave power supply B by the master power supply A, and if so, entering the step (3); if not, returning to the step (1).
3. The digital current sharing method according to claim 1, wherein in the step (1), the master power supply a acquires the output current value IoutB of the slave power supply B through the AD sampling device according to a preset sampling period t.
4. The digital current sharing method of claim 2, wherein the AD sampling device employs a current sensor.
5. The digital current sharing method according to claim 4, wherein the execution period T of the digital current sharing method is an integer multiple of the sampling period T.
6. The digital current sharing method according to claim 1, wherein during the current sharing process, the master power supply a protects the output voltage, the output current and the temperature thereof, and if the output voltage exceeds the maximum voltage allowed to be output, or the output current exceeds the maximum current allowed to be output, or the temperature is higher than the maximum allowed temperature, the master power supply a shuts down and sends a CAN message shutdown instruction to the slave power supply B, and the slave power supply B shuts down.
7. The digital current sharing method according to claim 5, wherein during the current sharing process, the slave power supply B protects the output voltage and temperature thereof, if the output voltage exceeds the maximum voltage allowed to be output or the temperature is higher than the maximum allowed temperature, the slave power supply B shuts down and sends a CAN message shutdown command to the master power supply A, and the master power supply A shuts down.
8. The digital current sharing method according to claim 1, wherein both of the two dc power supplies are digitally controlled using a TMS320F28335DSP chip.
9. The digital current sharing method according to claim 1 or 2, wherein the two DC power supplies are constant voltage power supplies of the same power.
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Application publication date: 20180119 |