CN109309389B - Method and system for controlling voltage stability of direct current bus of optical storage system - Google Patents
Method and system for controlling voltage stability of direct current bus of optical storage system Download PDFInfo
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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
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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
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention relates to a method and a system for controlling the voltage stability of a direct current bus of an optical storage system, which comprises the steps of firstly, obtaining a first reference current of the optical storage system according to the difference value of grid-connected power at an alternating current side and power at a photovoltaic side, and adaptively controlling a second reference current of the optical storage system according to the difference value of the reference voltage of the direct current bus and actual voltage of the direct current bus; and then, performing PI control on the obtained first reference current, the second reference current and the actual current of the energy storage system to obtain corresponding PWM pulses, and controlling a DC/DC conversion device of the energy storage system according to the PWM pulses. The power difference feedforward control and the voltage difference self-adaptive control are combined, and the problems that the PI parameter is difficult to adjust, easy to disperse and overshooting occurs initially in the prior art can be solved. In addition, the method ensures that the charge and discharge of the energy storage system can react faster, accelerates the dynamic response of the system, inhibits the fluctuation of the voltage of the direct current bus to a great extent, and enables the voltage of the direct current bus to be stabilized at the reference voltage.
Description
Technical Field
The invention relates to a method and a system for controlling the voltage stability of a direct current bus of an optical storage system, and belongs to the technical field of direct current bus voltage control of the optical storage system.
Background
The distributed power generation technology draws wide attention of people, a large number of random and intermittent distributed power sources are directly connected to the grid, adverse effects can be brought to the stability, the power quality and the like of a system, the problem can be well solved through the light storage coordination control system for stabilizing the fluctuation of photovoltaic output power and reducing the adverse effects of power fluctuation on a power grid, and the purpose of power regulation is achieved by absorbing 'surplus energy' or compensating 'shortage energy' through charging and discharging control on an energy storage system. The DC/DC conversion device on the energy storage system side in the optical storage coordination control system generally adopts a PI control method to stabilize the DC bus voltage, but the control method has the problems that the PI parameter is difficult to adjust and easy to disperse, and the initial overshoot exists, so that the quality of the DC bus voltage and the quality of the grid-connected current on the AC side are influenced.
Disclosure of Invention
The invention aims to provide a method for stabilizing and controlling the voltage of a direct current bus of an optical storage system, which is used for solving the problem that the voltage of the direct current bus cannot be reliably stabilized by the traditional method. The invention also provides a DC bus voltage stabilization control system of the light storage system.
In order to achieve the above object, the present invention provides a method for controlling the voltage stability of a dc bus of an optical storage system, comprising the following steps:
(1) obtaining a first reference current of the energy storage system according to a difference value of the grid-connected power at the alternating current side and the power at the photovoltaic side, and adaptively controlling a second reference current of the energy storage system according to a difference value of the reference voltage of the direct current bus and the actual voltage of the direct current bus;
(2) and performing PI control on the obtained first reference current, the second reference current and the actual current of the energy storage system to obtain corresponding PWM pulses, and controlling a DC/DC conversion device corresponding to the energy storage system according to the PWM pulses.
The calculation formula of the first reference current is as follows:
Ibatref1＝(Pgrid-Ppv)/Udcref
wherein, Ibatref1Is a first reference current, PgridFor ac side grid-connected power, PpvFor photovoltaic side power, UdcrefIs a direct current bus reference voltage.
When the absolute value of the difference value between the reference voltage of the direct current bus and the actual voltage of the direct current bus is smaller than or equal to a set voltage difference threshold value, setting the second reference current to be 0; when the absolute value of the difference value between the reference voltage of the direct current bus and the actual voltage of the direct current bus is larger than the voltage difference threshold value, the second reference current is in direct proportion to the difference value between the reference voltage of the direct current bus and the actual voltage of the direct current bus.
The calculation formula of the second reference current is as follows:
wherein, Ibatref2Is the second reference current, Δ Udc＝Udcref-Udc，UdcrefIs a DC bus reference voltage, UdcAnd the actual voltage of the direct current bus, N is the voltage difference threshold value, and k is an adjusting coefficient.
In the step (2), a sum of the first reference current and the second reference current is calculated to obtain a total reference current of the energy storage system, then, a difference between the total reference current and an actual current of the energy storage system is subjected to PI control, and the PWM pulse is obtained after amplitude limiting processing.
A DC bus voltage stabilization control system of an optical storage system comprises a control module for realizing the following control steps:
(1) obtaining a first reference current of the energy storage system according to a difference value of the grid-connected power at the alternating current side and the power at the photovoltaic side, and adaptively controlling a second reference current of the energy storage system according to a difference value of the reference voltage of the direct current bus and the actual voltage of the direct current bus;
(2) and performing PI control on the obtained first reference current, the second reference current and the actual current of the energy storage system to obtain corresponding PWM pulses, and controlling a DC/DC conversion device corresponding to the energy storage system according to the PWM pulses.
The calculation formula of the first reference current is as follows:
Ibatref1＝(Pgrid-Ppv)/Udcref
wherein, Ibatref1Is a first reference current, PgridFor ac side grid-connected power, PpvFor photovoltaic side power, UdcrefIs a direct current bus reference voltage.
When the absolute value of the difference value between the reference voltage of the direct current bus and the actual voltage of the direct current bus is smaller than or equal to a set voltage difference threshold value, setting the second reference current to be 0; when the absolute value of the difference value between the reference voltage of the direct current bus and the actual voltage of the direct current bus is larger than the voltage difference threshold value, the second reference current is in direct proportion to the difference value between the reference voltage of the direct current bus and the actual voltage of the direct current bus.
The calculation formula of the second reference current is as follows:
wherein, Ibatref2Is the second reference current, Δ Udc＝Udcref-Udc，UdcrefIs a DC bus reference voltage, UdcAnd the actual voltage of the direct current bus, N is the voltage difference threshold value, and k is an adjusting coefficient.
In the step (2), a sum of the first reference current and the second reference current is calculated to obtain a total reference current of the energy storage system, then, a difference between the total reference current and an actual current of the energy storage system is subjected to PI control, and the PWM pulse is obtained after amplitude limiting processing.
According to the method for controlling the voltage stability of the direct-current bus of the optical storage system, firstly, a first reference current of the energy storage system is obtained according to the difference value of grid-connected power at an alternating-current side and power at a photovoltaic side, and a second reference current of the energy storage system is adaptively controlled according to the difference value of the reference voltage of the direct-current bus and actual voltage of the direct-current bus; and after the two reference currents are obtained, PI control is carried out by combining the actual current of the energy storage system, PWM pulses are finally obtained, and the DC/DC conversion device of the energy storage system is controlled according to the PWM pulses. Therefore, the input parameters involved in the control method are all related parameters influencing the direct current bus voltage, and the change of the parameters can influence the stability of the direct current bus voltage, so that the control precision of the direct current bus voltage can be improved by controlling the direct current bus voltage according to the parameters. In addition, the direct current bus voltage stability control method combines power difference feedforward control and voltage difference self-adaptive control, and can solve the problems that the PI parameter is difficult to adjust, easy to disperse and overshooting occurs initially. And the DC/DC conversion device of the energy storage system is controlled through the difference value of the grid-connected power at the alternating current side and the power at the photovoltaic side and the difference value of the reference voltage of the direct current bus and the actual voltage of the direct current bus, the charging and discharging current of the energy storage system is essentially controlled, the charging and discharging of the energy storage system can be ensured to react faster, the dynamic response of the system is accelerated, the fluctuation of the voltage of the direct current bus is restrained to a great extent, and the voltage of the direct current bus is stabilized at the reference voltage.
Drawings
FIG. 1 is a schematic energy flow diagram of a light storage system;
FIG. 2 is a block diagram of the overall control of DC bus voltage stabilization control;
FIG. 3 is a waveform of DC bus voltage variation;
fig. 4 is a waveform diagram of variation of energy storage system power/photovoltaic power/grid-connected power.
Detailed Description
DC bus voltage stabilization control system embodiment of light storage system
As shown in fig. 1, a photovoltaic system is connected to a DC bus through a Boost circuit, an energy storage system is connected to the DC bus through a bidirectional DC/DC converter, the DC bus is connected to an AC bus through a bidirectional DC/AC converter, the AC bus is connected to an AC power grid, and an AC load may be connected to the AC bus.
In order to realize the stable control of the dc bus voltage of the optical storage system, the present embodiment provides a control system, which is called as an optical storage system dc bus voltage stable control system according to its function. The control system may be the control system of the light storage system itself, or may be a specially configured control system. The control system mainly comprises two parts, one part is a data acquisition module and is used for acquiring data information required by the control system, the other part is a control module, a direct-current bus voltage stabilization control strategy is loaded in the control module, and direct-current bus voltage stabilization control is carried out according to the acquired data information and the direct-current bus voltage stabilization control strategy.
The data information acquired by the data acquisition module comprises: AC side grid-connected power PgridPhotovoltaic side power PpvActual voltage U of direct current busdcAnd the actual current I of the energy storage systembat. The data information is obtained according to corresponding detection equipment, for example: actual voltage U of direct current busdcAccording to the acquisition of the direct-current voltage detection device, the data acquisition module is formed by the detection devices for detecting the data information, and the detection devices are conventional technologies, so the detailed description of the detection devices is omitted in this embodiment. In addition, since each of the above-mentioned detection devices may be a related device existing in the system itself, the dc bus voltage stabilization control system of the optical storage system may not include a data acquisition module, and thus the control system is focused on a control module, specifically, a control strategy loaded inside the control module, that is, a dc bus voltage stabilization control method of the storage system. The hardware structure of the control module is not limited.
The control strategy loaded by the control module integrally comprises the following steps:
(1) according to the AC side grid-connected power PgridAnd photovoltaic side power PpvThe difference value of the first reference current and the second reference current is obtainedbatref1According to the reference voltage U of the DC busdcrefAnd the actual voltage U of the DC busdcIs adaptively controlled to a second reference current I of the energy storage systembatref2；
(2) For the obtained first reference current Ibatref1A second reference current Ibatref2And the actual current I of the energy storage systembatAnd performing PI control to obtain corresponding PWM pulses, and controlling a DC/DC conversion device of the energy storage system according to the PWM pulses.
A specific embodiment of each of the above steps is given below.
(1) Obtaining AC side grid-connected power PgridAnd photovoltaic side power PpvAnd then dividing the difference Δ P by the dc bus reference voltage UdcrefAnd the obtained quotient is used as a first reference current I of the energy storage systembatref1As shown in fig. 2, this control process is called power difference feedforward control, and the calculation formula is as follows:
Ibatref1＝(Pgrid-Ppv)/Udcref
when the AC side is connected to the grid power PgridOr photovoltaic side power PpvWhen the change occurs, the power difference feedforward control directly controls the charging and discharging current of the energy storage system according to the power difference value, so that the charging and discharging of the energy storage system can be ensured to react faster, the dynamic response of the system is accelerated, and the fluctuation of the voltage of the direct current bus is restrained to a certain extent.
Calculating DC bus reference voltage UdcrefAnd the actual voltage U of the DC busdcDifference value of (delta) UdcNamely: delta Udc＝Udcref-UdcAccording to the difference value DeltaUdcFor the second reference current Ibatref2Adaptive control is performed, so the control process is called voltage difference adaptive control, and the specific control strategy is as follows: when the difference value is delta UdcIs less than or equal to a set voltage difference threshold value N, the second reference current Ibatref2Set to 0; when the difference value is delta UdcIs greater than the voltage difference threshold value N, the second reference current Ibatref2And the difference value delta UdcAnd positive correlation is realized, the two are in a direct ratio relationship, and the specific relationship form is set according to the actual control requirement. Based on the above control, a calculation formula corresponding to the control process is given as follows:
the voltage difference threshold N is set according to actual control requirements, for example, the range of N may be set to [5, 10%]I.e. N ∈ [ [5, 101 ]]0]. k is an adjusting coefficient which is also set according to actual control requirements, can be fixed and can also be set according to delta UdcSuch as: when Δ UdcWhen ≦ 200, k may range from: k is more than or equal to 0.00001 and less than or equal to 0.001; when Δ UdcFor > 200, k may range from: k is more than or equal to 0.002 and less than or equal to 0.01, and in addition, the optimal value of k can be finally determined through debugging.
Then, when the difference value Δ UdcIs greater than the voltage difference threshold value N, 1) the difference value DeltaUdcWhen the voltage is greater than 0, the actual voltage U of the direct current bus is judgeddcReducing, the second reference current Ibatref2By step size k Δ UdcThe positive direction is gradually increased, namely the discharge current of the energy storage system is increased, so that the actual voltage U of the direct current bus is increaseddcStep-up back to reference voltage UdcrefThe specific step value is based on the difference value delta UdcIs adaptively changed in magnitude, Delta UdcThe larger the step size, and conversely, the step size is Δ UdcThe smaller the step size. 2) Difference value delta UdcWhen the voltage is less than 0, the actual voltage U of the direct current bus is judgeddcRaising, second reference current Ibatref2By step size k Δ UdcThe negative direction is gradually increased, namely the charging current of the energy storage system is increased, so that the actual voltage U of the direct current bus is increaseddcStep-by-step down to a reference voltage Udcref。
(2) Obtaining a reference current Ibatref1And Ibatref2Then, firstFirst, the reference current I is calculatedbatref1And Ibatref2Is the total reference current I of the energy storage systembatrefThen calculating the total reference current IbatrefActual current I to the energy storage systembatAnd (3) sending the difference value to a PI controller for PI control, performing amplitude limiting treatment, comparing an output result after the amplitude limiting treatment with a triangular carrier to obtain PWM (pulse width modulation) pulse, and finally acting the obtained PWM pulse on a DC/DC (direct current/direct current) conversion device of the energy storage system to realize the stable control of the voltage of the direct current bus.
Of course, the DC bus reference voltage UdcrefThe voltage difference threshold N and the adjustment coefficient k may be initialized before the control strategy is implemented.
As shown in fig. 3, which is a waveform diagram of the variation of the dc bus voltage during the dc voltage stabilization control process, wherein the horizontal axis represents time(s) and the vertical axis represents the dc bus voltage (V), it can be seen from the diagram that the dc bus voltage gradually tends to be stable along with the stabilization control process; FIG. 4 shows the power P of the energy storage system during the DC voltage stabilization controlbatPhotovoltaic side power PpvAC side grid-connected power PgridThe waveform of (2), wherein the horizontal axis represents time(s) and the vertical axis represents power (kW).
Embodiment of method for controlling voltage stability of direct current bus of optical storage system
The embodiment provides a method for controlling the voltage stability of a direct current bus of an optical storage system, which comprises the following steps:
(1) according to the AC side grid-connected power PgridAnd photovoltaic side power PpvThe difference value of the first reference current and the second reference current is obtainedbatref1According to the reference voltage U of the DC busdcrefAnd the actual voltage U of the DC busdcIs adaptively controlled to a second reference current I of the energy storage systembatref2；
(2) For the obtained first reference current Ibatref1A second reference current Ibatref2And the actual current I of the energy storage systembatAnd performing PI control to obtain corresponding PWM pulses, and controlling a DC/DC conversion device of the energy storage system according to the PWM pulses.
Then, the control method is a control strategy loaded in the control module of the dc bus voltage stabilization control system of the optical storage system, and since the specific implementation process of the control strategy is described in detail in the above system embodiment, the specific description of this embodiment is omitted.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (6)
1. A method for controlling the voltage stability of a direct current bus of an optical storage system is characterized by comprising the following steps:
(1) obtaining a first reference current of the energy storage system according to a difference value of the grid-connected power at the alternating current side and the power at the photovoltaic side, and adaptively controlling a second reference current of the energy storage system according to a difference value of the reference voltage of the direct current bus and the actual voltage of the direct current bus;
(2) performing PI control on the obtained first reference current, the second reference current and the actual current of the energy storage system to obtain corresponding PWM pulses, and controlling a DC/DC conversion device corresponding to the energy storage system according to the PWM pulses;
when the absolute value of the difference value between the reference voltage of the direct current bus and the actual voltage of the direct current bus is smaller than or equal to a set voltage difference threshold value, setting the second reference current to be 0; when the absolute value of the difference value between the direct current bus reference voltage and the direct current bus actual voltage is larger than the voltage difference threshold value, the value of the second reference current is in direct proportion to the difference value between the direct current bus reference voltage and the direct current bus actual voltage;
the calculation formula of the second reference current is as follows:
wherein, Ibatref2Is the second reference current, Δ Udc＝Udcref-Udc，UdcrefIs a DC bus reference voltage, UdcAnd the actual voltage of the direct current bus, N is the voltage difference threshold value, and k is an adjusting coefficient.
2. The method for controlling the voltage stabilization of the direct current bus of the light storage system according to claim 1, wherein the first reference current is calculated by the following formula:
Ibatref1＝(Pgrid-Ppv)/Udcref
wherein, Ibatref1Is a first reference current, PgridFor ac side grid-connected power, PpvFor photovoltaic side power, UdcrefIs a direct current bus reference voltage.
3. The method according to claim 1 or 2, wherein in the step (2), a sum of the first reference current and the second reference current is calculated to obtain a total reference current of the energy storage system, and then a difference between the total reference current and an actual current of the energy storage system is subjected to PI control, and the PWM pulse is obtained after amplitude limiting.
4. The utility model provides a light stores up system direct current bus voltage stable control system which characterized in that, includes the control module who realizes following control step:
(1) obtaining a first reference current of the energy storage system according to a difference value of the grid-connected power at the alternating current side and the power at the photovoltaic side, and adaptively controlling a second reference current of the energy storage system according to a difference value of the reference voltage of the direct current bus and the actual voltage of the direct current bus;
(2) performing PI control on the obtained first reference current, the second reference current and the actual current of the energy storage system to obtain corresponding PWM pulses, and controlling a DC/DC conversion device corresponding to the energy storage system according to the PWM pulses;
when the absolute value of the difference value between the reference voltage of the direct current bus and the actual voltage of the direct current bus is smaller than or equal to a set voltage difference threshold value, setting the second reference current to be 0; when the absolute value of the difference value between the direct current bus reference voltage and the direct current bus actual voltage is larger than the voltage difference threshold value, the value of the second reference current is in direct proportion to the difference value between the direct current bus reference voltage and the direct current bus actual voltage;
the calculation formula of the second reference current is as follows:
wherein, Ibatref2Is the second reference current, Δ Udc＝Udcref-Udc，UdcrefIs a DC bus reference voltage, UdcAnd the actual voltage of the direct current bus, N is the voltage difference threshold value, and k is an adjusting coefficient.
5. The light storage system direct current bus voltage stabilization control system according to claim 4, wherein the first reference current is calculated by the formula:
Ibatref1＝(Pgrid-Ppv)/Udcref
wherein, Ibatref1Is a first reference current, PgridFor ac side grid-connected power, PpvFor photovoltaic side power, UdcrefIs a direct current bus reference voltage.
6. The direct-current bus voltage stability control system of the optical storage system according to claim 4 or 5, wherein in the step (2), a sum of the first reference current and the second reference current is calculated to obtain a total reference current of the energy storage system, then a difference between the total reference current and an actual current of the energy storage system is subjected to PI control, and the PWM pulse is obtained after amplitude limiting.
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| CN112332517B (en) * | 2020-10-16 | 2022-04-26 | 许继电源有限公司 | Photovoltaic charging MPPT control circuit |
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| 基于功率前馈的光储系统直流母线电压稳定方法研究;翟登辉，等;《通信电源技术》;20160325;第33卷(第2期);41-43页 * |
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