CN114069693A - Black start control method and device and photovoltaic energy storage power supply system - Google Patents
Black start control method and device and photovoltaic energy storage power supply 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a black start control method and device and a photovoltaic energy storage power supply system. The method is applied to a photovoltaic energy storage power supply system and comprises a photovoltaic power generation device, a direct current bus, a bus capacitor and a starting control module, wherein the starting control module is connected with the direct current bus through a first weak power supply and is used for controlling whether the photovoltaic energy storage power supply system is started or not, and the method comprises the following steps: after the output voltage of the photovoltaic power generation device meets a preset condition, controlling the photovoltaic power generation device to generate power and continuously setting the time length to charge the bus capacitor; and controlling the power-on state of the starting control module according to the electric quantity stored by the bus capacitor, and further controlling whether the photovoltaic energy storage power supply system is started. According to the invention, when the electric quantity stored in the bus capacitor is sufficient, the start control module is controlled to operate, so that frequent start of the start control module due to insufficient electric energy can be avoided, and the reliability of the photovoltaic energy storage power supply system is improved.
Description
Technical Field
The invention relates to the technical field of electronic power, in particular to a black start control method and device and a photovoltaic energy storage power supply system.
Background
In a photovoltaic energy storage power supply system, when an energy storage battery is over-discharged, the electric quantity of the energy storage battery cannot supply power to a starting control module at the moment, and the starting control module can only be supplied with power through photovoltaic power, so that the system is recovered to operate again. In the black start process, one of the problems that always exists is that when the illumination intensity is weak and the power generation power of the photovoltaic power generation device is not enough to enable the start control module to normally work, the start control module is frequently restarted, the frequent restart of the start control module increases the risk of system failure, reduces the reliability of the system, and shortens the service life of the system.
Aiming at the problems that in the prior art, the power generation power of a photovoltaic power generation device is not enough to support the normal operation of a starting control module, the starting control module is easy to restart frequently, and the reliability is reduced, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a black start control method and device and a photovoltaic energy storage power supply system, and aims to solve the problems that in the prior art, due to the fact that the photovoltaic power generation device has insufficient power generation to support normal operation of a start control module, the start control module is easy to restart frequently, and reliability is reduced.
In order to solve the technical problem, the invention provides a black start control method, which is applied to a photovoltaic energy storage power supply system and comprises a photovoltaic power generation device, a direct current bus, a bus capacitor and a start control module, wherein the start control module is connected with the direct current bus through a first weak power supply and is used for controlling whether the photovoltaic energy storage power supply system is started or not, and the method comprises the following steps:
after the output voltage of the photovoltaic power generation device meets a preset condition, controlling the photovoltaic power generation device to generate power and continuously setting the time length to charge the bus capacitor;
and controlling the power-on state of the starting control module according to the electric quantity stored by the bus capacitor, and further controlling whether the photovoltaic energy storage power supply system is started.
Further, controlling the photovoltaic power generation device to generate power for a set duration comprises:
and controlling the photovoltaic power generation device to generate power in an optimal power mode and continuing for the set time.
Further, according to the electric quantity stored in the bus capacitor, the power-on state of the starting control module is controlled, and then whether the photovoltaic energy storage power supply system is started is controlled, including:
calculating the electric quantity stored by the bus capacitor, and then comparing the magnitude relation between the electric quantity stored by the bus capacitor and the electric quantity required by the start control module to finish black start;
if the electric quantity stored by the bus capacitor is larger than or equal to the electric quantity required by the starting control module for completing black start, controlling the starting control module to be electrified so as to control the photovoltaic energy storage power supply system to start;
and if the electric quantity stored by the bus capacitor is less than the electric quantity required by the start control module to complete black start, controlling the start control module to keep a power-off state so as to control the photovoltaic energy storage power supply system to stop starting.
Further, when the electric quantity stored in the bus capacitor is calculated, the calculation is realized according to the following formula:
the W1 is the electric quantity stored by the bus capacitor, the C is the capacitance value of the bus capacitor, the V0 is the initial direct current bus voltage, and the V1 is the direct current bus voltage after the bus capacitor is charged for a set time.
Further, the starting control module is controlled to keep a power-off state so as to control the photovoltaic energy storage and power supply system to stop starting, and the method further comprises the following steps:
controlling the bus capacitor to discharge;
and after the voltage of the direct current bus is equal to the initial direct current bus voltage, the photovoltaic power generation device is triggered and controlled to generate power again and the set duration is continued.
Further, before the photovoltaic power generation device is triggered again to generate power for a set time, the method further comprises:
and prolonging and updating the set time length.
Further, the preset conditions are as follows:
the output voltage of the photovoltaic power generation device is greater than or equal to the direct current bus voltage of the photovoltaic energy storage power supply system.
The invention also provides a black start control device, which is applied to a photovoltaic energy storage power supply system and comprises a photovoltaic power generation device, a direct current bus, a bus capacitor and a start control module, wherein the start control module is connected with the direct current bus through a first weak power supply and is used for controlling whether the photovoltaic energy storage power supply system is started, the black start control device is connected with the photovoltaic power generation device through a second weak power supply, and the black start control device comprises:
the first control module is used for controlling the photovoltaic power generation device to generate power and continuously set time length after the output voltage of the photovoltaic power generation device meets a preset condition, and charging a bus capacitor of the photovoltaic energy storage and power supply system;
and the second control module is used for controlling the power-on state of the starting control module according to the electric quantity stored by the bus capacitor, and further controlling whether the photovoltaic energy storage power supply system is started or not.
The invention also provides a photovoltaic energy storage power supply system, which comprises: the photovoltaic power generation device comprises a photovoltaic power generation device, a direct current bus, a bus capacitor and a starting control module, wherein the starting control module is connected with the direct current bus through a first weak power supply and used for controlling whether the photovoltaic energy storage power supply system is started or not, and the photovoltaic power generation device also comprises the black starting control device.
Further, the photovoltaic energy storage and power supply system further comprises: a boost circuit connected between the photovoltaic power generation device and the dc bus, including:
the first inductor and the first switching tube are connected in series and then are arranged between a positive terminal of the photovoltaic power generation device and a positive line of the direct current bus;
and a second switch tube, wherein a first pole of the second switch tube is connected between the first inductor and the first switch tube, and a second pole of the second switch tube is connected between a negative terminal of the photovoltaic power generation device and a negative line of the direct current bus.
Further, the photovoltaic energy storage and power supply system further comprises:
the third switching tube is connected with the first resistor in series and then connected between the positive line and the negative line of the direct current bus, and the third switching tube and the first resistor are used for controlling the bus capacitor to discharge.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the black start control method described above.
By applying the technical scheme of the invention, after the output voltage of the photovoltaic power generation device meets the preset condition, the photovoltaic power generation device is controlled to generate power and continuously set the time length to charge the bus capacitor, then the power-on state of the starting control module is controlled according to the electric quantity stored in the bus capacitor, so that whether the photovoltaic energy storage power supply system is started or not is controlled, and when the electric quantity stored in the bus capacitor is sufficient, the starting control module is controlled to operate, so that the starting control module is prevented from being frequently started due to insufficient electric energy, and the reliability of the photovoltaic energy storage power supply system is improved.
Drawings
Fig. 1 is a block diagram of a photovoltaic energy storage and supply system according to an embodiment of the invention;
FIG. 2 is a flowchart of a black start control method according to an embodiment of the present invention;
FIG. 3 is a flowchart of a black start control method according to another embodiment of the present invention;
fig. 4 is a block diagram of a photovoltaic energy storage and supply system according to another embodiment of the invention;
fig. 5 is an internal structural view of a black start control apparatus according to an embodiment of the present invention;
fig. 6 is an internal structure view of a black start control apparatus according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the switching tubes in embodiments of the present invention, the switching tubes should not be limited to these terms. These terms are only used to separate switching tubes that are placed in different positions. For example, the first switch tube may also be referred to as the second switch tube, and similarly, the second switch tube may also be referred to as the first switch tube without departing from the scope of the embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The embodiment provides a black start control method, which is applied to a photovoltaic energy storage power supply system, and fig. 1 is a structural diagram of the photovoltaic energy storage power supply system according to the embodiment of the present invention, as shown in fig. 1, the photovoltaic energy storage power supply system includes a photovoltaic power generation apparatus 1, a direct current bus, a bus capacitor C1, and a start control module 4, where the start control module 4 is connected to the direct current bus through a first weak power source 3, and is used to control whether the photovoltaic energy storage power supply system is started.
Photovoltaic energy storage power supply system still includes: the booster circuit 5 is connected between the photovoltaic power generation device and the direct current bus, and includes: the first inductor L and the first switching tube MOS1 are connected in series and then are arranged between the positive terminal of the photovoltaic power generation device 1 and the positive line of the direct current bus; a second switching MOS2 has a first pole connected between the first inductor L and the first switching MOS1, and a second pole connected between the negative terminal of the photovoltaic power generation apparatus 1 and the negative line of the dc bus. The boosting circuit 5 boosts the voltage by controlling the duty ratio of the first switching transistor MOS1 and the second switching transistor MOS 2.
Be provided with first switch K1 on photovoltaic power generation device 1's the negative pole terminal for whether control photovoltaic power generation device 1 outwards generates electricity, first switch K1 is normally closed switch, control photovoltaic access and surely go out, after energy storage battery takes place to put excessively, control K1 disconnection, be provided with second switch K2 on the positive pole line of direct current bus for whether control first weak power supply 3 switches on, second switch K2 is normally open switch.
Above-mentioned photovoltaic energy storage power supply system still includes: the third switching tube MOS3 and the first resistor R1 are connected in series, and the third switching tube MOS3 and the first resistor R1 are connected between the positive electrode line and the negative electrode line of the direct current bus to control the bus capacitor C1 to discharge.
Fig. 2 is a flowchart of a black start control method according to an embodiment of the present invention, as shown in fig. 2, the method includes:
s101, after the output voltage of the photovoltaic power generation device meets a preset condition, controlling the photovoltaic power generation device to generate power and continuously setting time duration to charge the bus capacitor.
In specific implementation, after the output voltage of the photovoltaic power generation apparatus 1 meets the preset condition and the bus capacitor can be charged, the first switch K1 in fig. 1 is controlled to be turned on to charge the bus capacitor C1.
And S102, controlling the power-on state of the starting control module according to the electric quantity stored in the bus capacitor, and further controlling whether the photovoltaic energy storage power supply system is started.
According to the black start control method, after the output voltage of the photovoltaic power generation device meets the preset condition, the photovoltaic power generation device is controlled to generate power and continuously set the time length to charge the bus capacitor, then the power-on state of the start control module is controlled according to the electric quantity stored in the bus capacitor, and then whether the photovoltaic energy storage power supply system is started is controlled.
Example 2
The embodiment provides another black start control method, which is to control the photovoltaic power generation device to generate power and continuously set a time duration for quickly realizing black start, and the method includes: and controlling the photovoltaic power generation device to generate power in an optimal power mode and continuously setting the time length. Namely, the photovoltaic power generation device is controlled to generate power with the maximum power, and the black start time is shortened.
In order to realize according to the electric quantity of system storage, the opportunity of accurate control black start, according to the electric quantity control start control module's of bus capacitor storage power state, and then whether control photovoltaic energy storage power supply system starts, include: calculating the electric quantity stored by the bus capacitor, and then comparing the magnitude relation between the electric quantity stored by the bus capacitor and the electric quantity required by the start control module to complete black start; if the electric quantity stored by the bus capacitor is larger than or equal to the electric quantity required by the start control module to complete black start, the electric quantity stored by the bus capacitor can support the start control module to complete black start at the moment, the start control module is controlled to be powered on to control the start of the photovoltaic energy storage power supply system, and in specific implementation, the first weak power supply 3 is switched on by controlling the second switch K2 in the figure 1 to be switched on, so that the start control module 4 is powered on; if the electric quantity stored by the bus capacitor is smaller than the electric quantity required by the start control module for completing the black start, the electric quantity stored by the bus capacitor cannot support the start control module to complete the black start, and in order to avoid starting the control module for multiple times, the start control module is controlled to be in a power-off state so as to control the photovoltaic energy storage power supply system to stop starting, namely the second switch K2 is controlled to be switched off, the first weak power supply 3 is switched off, and then the start control module 4 is switched off.
In order to realize the purpose that the electric quantity stored by the capacitor is calculated according to the variable quantity of the DC bus voltage before and after the bus capacitor is charged, the electric quantity stored by the bus capacitor is calculated according to the following formula: w1 ═ 12C (V1-V0)2(ii) a W1 is the amount of electricity stored in the bus capacitor, C is the capacitance value of the bus capacitor, V0 is the initial dc bus voltage, and V1 is the dc bus voltage after the bus capacitor has been charged for a set duration.
Under the condition that the electric quantity stored by the bus capacitor cannot support the starting control module to complete black starting, two factors exist, one is that the current illumination intensity is insufficient, so that the generating power of the photovoltaic power generation device is low, and further the electric energy stored by the bus capacitor is less in the set time. Because perhaps when charging next time, illumination intensity can become good, can directly control bus capacitor to charge for setting for a long time again, then judge whether the electric quantity of bus capacitor satisfies the required electric quantity demand of the black start of start control module completion, another kind is to prolong the setting for a long time, then judge whether the electric quantity of bus capacitor satisfies the required electric quantity demand of the black start of start control module completion. In either case, the control bus capacitor must be discharged first to return the dc bus voltage to the initial voltage value V0. Therefore, the method further comprises the step of controlling the start control module to maintain the power-off state so as to control the photovoltaic energy storage and power supply system to stop starting after the start control module stops starting: controlling the bus capacitor to discharge; and after the voltage of the direct current bus is equal to the initial direct current bus voltage, the photovoltaic power generation device is triggered again to generate power and the set duration is continued. Specifically, the third switching transistor MOS3 in fig. 1 is controlled to be turned on, and the bus capacitor C1 is discharged through the first resistor R1.
If the method for prolonging the set time is adopted and then judging whether the electric quantity of the bus capacitor meets the electric quantity requirement for finishing the black start of the start control module, before the photovoltaic power generation device is triggered again to generate electricity and the set time is continued, the method further comprises the following steps: and prolonging and updating the set time, controlling the photovoltaic power generation device to generate power according to the updated set time, and controlling the power-on state of the starting control module according to the electric quantity stored in the bus capacitor so as to control whether the photovoltaic energy storage power supply system is started or not.
According to the foregoing, the photovoltaic power generation device is controlled to generate power and continuously set for a set time length, before the bus capacitor is charged, the generated voltage of the photovoltaic power generation device is required to meet a certain requirement, so as to ensure that the first switch, the third switch tube and other elements can be controlled to be turned on, and therefore, the preset conditions are as follows: the output voltage of the photovoltaic power generation device is larger than or equal to the direct current bus voltage of the photovoltaic energy storage power supply system.
The present invention is described in detail below with reference to a specific example, where the black start control method of this embodiment is applied to the photovoltaic energy storage and power supply system shown in fig. 1, fig. 3 is a flowchart of a black start control method according to another embodiment of the present invention, and as shown in fig. 3, the black start control method specifically includes:
and S1, performing insulation impedance detection, judging whether the photovoltaic energy storage power supply system has insulation abnormality, if so, executing the step S2 and then returning to the step S1, and if not, executing the step S3.
And S2, repairing the insulation abnormality.
S3, collecting the output voltage of the photovoltaic power generation device and the direct current bus voltage, judging whether the output voltage of the photovoltaic power generation device is greater than the direct current bus voltage, if so, executing the step S4, otherwise, repeatedly executing the step S3 until the judgment result is yes.
When a certain illumination intensity exists, the photovoltaic power generation device starts to output voltage, power can be supplied to the black start control device, and the black start control device starts to work, wherein one point to be described is that the black start control device also has certain power, only the power is small, the peak power is within 15W, and if the output voltage of the photovoltaic power generation device is 80V, the normal work of the black start control device can be ensured only by current of 187.5mA, so that the normal work of the black start control device can be basically ensured only by weak illumination. After the black start control device works normally, the following steps are executed.
And S4, recording the current initial direct current bus voltage V0, controlling the photovoltaic power generation device to generate power for a set time length according to a maximum power point optimizing mode, stopping working, and recording the bus voltage value V1 after the set time length of charging.
Assuming that the maximum duty cycle D of the first switching MOS1 is 0.85, the following relationship should be satisfied between V1 and V0: v1 ═ 6.67 × V0; when the time required for completing the black start is fixed and the maximum power required for completing the black start by the start control module is fixed, in order to prevent the voltage of V1 from being too high, the capacitance value of the bus capacitor C1 can be increased.
And S5, calculating the electric quantity W1 stored by the bus capacitor according to the capacitance value of the bus capacitor, the initial direct current bus voltage V0 and the direct current bus voltage V1 after the charging set time length.
By the formula
The energy W1 stored by the bus capacitor is calculated.
And S6, judging whether the energy W1 stored in the bus capacitor is larger than or equal to the electric quantity Wmax required by the start control module to finish black start or not, if so, executing the step S7, otherwise, executing the step S8, and returning to the step S4.
And S7, controlling the second switch K2 to be closed, and enabling the starting control module to control the photovoltaic energy storage system to complete black starting.
And S8, controlling the MOS3 of the third switching tube to be conducted, and discharging the bus capacitor until the voltage of the direct current bus is reduced to V0.
If the energy W1 stored by the bus capacitor is larger than or equal to the electric quantity Wmax required by the start control module to finish black start, the illumination intensity at the moment is indicated to meet the black start requirement, the second switch K2 is closed, and the photovoltaic power generation device is controlled to operate in the maximum power optimizing mode.
And if the energy W1 stored in the bus capacitor is less than the electric quantity Wmax required by the black start of the start control module, controlling the third switching tube MOS3 to be closed, discharging the bus capacitor C1 through the first resistor R1 until the voltage of the direct-current bus is reduced to V0, and then turning to the step 1 to continuously judge and execute. Wmax is calculated as WmaxPmax t2, Pmax is the maximum power required by the start control module to complete the black start, t2 is the time required to complete the black start, and the value of t2 can be determined according to the maximum duration required by the start control module to complete the black start.
The black start control method of the embodiment can greatly reduce the starting times in the black start process, improve the reliability of the whole system and prolong the service life.
Example 3
The embodiment provides a black-start control device, which is applied to a photovoltaic energy storage power supply system, fig. 4 is a structural diagram of a photovoltaic energy storage power supply system according to another embodiment of the present invention, as shown in fig. 4, the photovoltaic energy storage power supply system includes a photovoltaic power generation apparatus 1, a dc bus, a bus capacitor C1, and a start control module 4, the start control module 4 is connected to the dc bus through a first weak power source 3 for controlling whether the photovoltaic energy storage power supply system is started, and the black-start control device 7 is connected to the photovoltaic power generation apparatus through a second weak power source 6.
Fig. 5 is an internal structure view of a black start control apparatus according to an embodiment of the present invention, and as shown in fig. 5, the black start control apparatus includes:
the first control module 10 is configured to control the photovoltaic power generation device to generate power and continuously set a time length after the output voltage of the photovoltaic power generation device meets a preset condition, so as to charge a bus capacitor of the photovoltaic energy storage and power supply system.
In specific implementation, after the output voltage of the photovoltaic power generation apparatus 1 meets the preset condition and the bus capacitor can be charged, the first switch K1 in fig. 1 is controlled to be turned on to charge the bus capacitor C1.
And the second control module 20 is configured to control the power-on state of the start control module according to the electric quantity stored in the bus capacitor, so as to control whether the photovoltaic energy storage power supply system is started.
The black start control device of this embodiment, after photovoltaic power generation device's output voltage satisfied the preset condition, control photovoltaic power generation device electricity generation and last for setting for long, charge for bus capacitance, later according to the electric quantity control start control module's of bus capacitance storage power on state, and then whether control photovoltaic energy storage power supply system starts, when the electric quantity of bus capacitance storage is sufficient, the operation of start control module is controlled again, avoid because the electric energy is not enough to lead to starting control module frequently to start, improve photovoltaic energy storage power supply system's reliability.
Example 4
In order to realize the black start quickly, the first control module 10 includes a charging control unit 101, specifically configured to: and controlling the photovoltaic power generation device to generate power in an optimal power mode and continuously setting the time length. Namely, the photovoltaic power generation device is controlled to generate power with the maximum power, and the black start time is shortened.
Fig. 6 is an internal structure diagram of a black start control device according to another embodiment of the present invention, and as shown in fig. 6, in order to accurately control the black start timing according to the power stored in the system, the second control module 20 includes: the calculating unit 201 is used for calculating the electric quantity stored by the bus capacitor, and then comparing the magnitude relation between the electric quantity stored by the bus capacitor and the electric quantity required by the start control module to complete black start; the first control unit 202 is configured to control the start control module to be powered on when the electric quantity stored in the bus capacitor is greater than or equal to the electric quantity required by the start control module to complete black start, so as to control the photovoltaic energy storage and power supply system to start, and the electric quantity stored in the bus capacitor is greater than or equal to the electric quantity required by the start control module to complete black start, which indicates that the electric quantity stored in the bus capacitor can support the start control module to complete black start at this time, so that the start control module is controlled to be powered on, so as to control the photovoltaic energy storage and power supply system to start, and in specific implementation, the first weak power supply 3 is turned on by controlling the second switch K2 in fig. 1 to be turned on, so that the start control module 4 is powered on.
The second control unit 203 is used for controlling the start control module to keep a power-off state when the electric quantity stored in the bus capacitor is smaller than the electric quantity required by the start control module to complete black start, so as to control the photovoltaic energy storage power supply system to stop starting, the electric quantity stored in the bus capacitor is smaller than the electric quantity required by the start control module to complete black start, which indicates that the electric quantity stored in the bus capacitor cannot support the start control module to complete black start, in order to avoid starting the control module for multiple times, therefore, the start control module is controlled to keep the power-off state, so as to control the photovoltaic energy storage power supply system to stop starting, namely, the second switch K2 is controlled to be switched off, so that the first weak power supply 3 is switched off, and further the start control module 4 is switched off.
Under the condition that the electric quantity stored by the bus capacitor cannot support the starting control module to complete black start, two factors exist, one is that the current illumination intensity is insufficient, the generated power of the photovoltaic power generation device is low, and further the electric energy stored by the bus capacitor is small in the set time, aiming at the two factors, if the black start is to be continuously completed, two modes exist, one mode is that the set time is not changed, because the next charging is possible, the illumination intensity can be improved, the bus capacitor can be directly controlled to be charged again for the set time, then whether the electric quantity of the bus capacitor meets the electric quantity requirement for the starting control module to complete the black start or not is judged, the other mode is that the set time is prolonged, and then whether the electric quantity of the bus capacitor meets the electric quantity requirement for the starting control module to complete the black start or not is judged. In either case, the control bus capacitor must be discharged first to return the dc bus voltage to the initial voltage value V0. Therefore, the second control module 20 further includes: the discharging control unit 204 is used for controlling the starting control module to keep a power-off state so as to control the bus capacitor to discharge after the photovoltaic energy storage power supply system stops starting; after the voltage of the dc bus is equal to the initial dc bus voltage, the first control module 10 triggers the photovoltaic power generation device to generate power again and continues for a set duration. Specifically, the third switching transistor MOS3 in fig. 1 is controlled to be turned on, and the bus capacitor C1 is discharged through the first resistor R1.
The first control module further comprises a setting unit 102, which is used for prolonging and updating the set time before the photovoltaic power generation device is triggered again to generate power and the set time is continued, then controlling the photovoltaic power generation device to generate power according to the updated set time, and then controlling the power-on state of the start control module according to the electric quantity stored in the bus capacitor, so as to control whether the photovoltaic energy storage power supply system is started.
According to the foregoing, the photovoltaic power generation device is controlled to generate power and continuously set for a set time length, before the bus capacitor is charged, the generated voltage of the photovoltaic power generation device is required to meet a certain requirement, so as to ensure that the first switch, the third switch tube and other elements can be controlled to be turned on, and therefore, the preset conditions are as follows: the output voltage of the photovoltaic power generation device is larger than or equal to the direct current bus voltage of the photovoltaic energy storage power supply system. The first control module 10 further includes a first collecting unit 103, configured to collect an output voltage of the photovoltaic power generation apparatus; and the second acquisition unit 104 is used for acquiring the direct-current bus voltage of the photovoltaic energy storage power supply system.
Example 5
The embodiment provides a photovoltaic energy storage power supply system, as shown in fig. 4 mentioned above, the photovoltaic energy storage power supply system includes a photovoltaic power generation device 1, a dc bus, a bus capacitor C1 and a start control module 4, the start control module 4 is connected to the dc bus through a first weak power source 3 for controlling whether the photovoltaic energy storage power supply system is started, and the system further includes a black start control device 7, and the black start control device 7 is connected to the photovoltaic power generation device through a second weak power source 6.
Photovoltaic energy storage power supply system still includes: a booster circuit 5 connected between the photovoltaic power generation apparatus and the dc bus, including: the first inductor L and the first switching tube MOS1 are connected in series and then are arranged between the positive terminal of the photovoltaic power generation device 1 and the positive line of the direct current bus; a second switching MOS2 has a first pole connected between the first inductor L and the first switching MOS1, and a second pole connected between the negative terminal of the photovoltaic power generation apparatus 1 and the negative line of the dc bus. The boosting circuit 5 boosts the voltage by controlling the duty ratio of the first switching transistor MOS1 and the second switching transistor MOS 2.
Be provided with first switch K1 on photovoltaic power generation device 1's the negative pole terminal for whether control photovoltaic power generation device 1 outwards generates electricity, first switch K1 is normally closed switch, control photovoltaic access and surely go out, after energy storage battery takes place to put excessively, control K1 disconnection, be provided with second switch K2 on the positive pole line of direct current bus for whether control first weak power supply 3 switches on, second switch K2 is normally open switch.
The photovoltaic energy storage power supply system further comprises: the third switching tube MOS3 and the first resistor R1 are connected in series, and the third switching tube MOS3 and the first resistor R1 are connected between the positive electrode line and the negative electrode line of the direct current bus to control the bus capacitor C1 to discharge.
Example 6
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the above-described black start control method.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (12)
1. A black start control method is applied to a photovoltaic energy storage power supply system and comprises a photovoltaic power generation device, a direct current bus, a bus capacitor and a start control module, wherein the start control module is connected with the direct current bus through a first weak power supply and is used for controlling whether the photovoltaic energy storage power supply system is started or not, and the method is characterized by comprising the following steps of:
after the output voltage of the photovoltaic power generation device meets a preset condition, controlling the photovoltaic power generation device to generate power and continuously setting the time length to charge the bus capacitor;
and controlling the power-on state of the starting control module according to the electric quantity stored by the bus capacitor, and further controlling whether the photovoltaic energy storage power supply system is started.
2. The method of claim 1, wherein controlling the photovoltaic power generation device to generate power for a set duration comprises:
and controlling the photovoltaic power generation device to generate power in an optimal power mode and continuing for the set time.
3. The method according to claim 1, wherein controlling the power-on state of the startup control module according to the amount of electricity stored in the bus capacitor, and further controlling whether the photovoltaic energy storage and power supply system is started comprises:
calculating the electric quantity stored by the bus capacitor, and then comparing the magnitude relation between the electric quantity stored by the bus capacitor and the electric quantity required by the start control module to finish black start;
if the electric quantity stored by the bus capacitor is larger than or equal to the electric quantity required by the starting control module for completing black start, controlling the starting control module to be electrified so as to control the photovoltaic energy storage power supply system to start;
and if the electric quantity stored by the bus capacitor is less than the electric quantity required by the start control module to complete black start, controlling the start control module to keep a power-off state so as to control the photovoltaic energy storage power supply system to stop starting.
4. The method of claim 3, wherein the amount of power stored by the bus capacitor is calculated according to the following equation:
the W1 is the electric quantity stored by the bus capacitor, the C is the capacitance value of the bus capacitor, the V0 is the initial direct current bus voltage, and the V1 is the direct current bus voltage after the bus capacitor is charged for a set time.
5. The method according to claim 3, wherein the start-up control module is controlled to maintain a power-off state to control the photovoltaic energy storage and supply system to stop starting up, and the method further comprises:
controlling the bus capacitor to discharge;
and after the voltage of the direct current bus is equal to the initial direct current bus voltage, the photovoltaic power generation device is triggered and controlled to generate power again and the set duration is continued.
6. The method of claim 5, wherein before re-triggering control of the photovoltaic power plant to generate electricity for a set length of time, the method further comprises:
and prolonging and updating the set time length.
7. The method according to claim 1, wherein the preset condition is:
the output voltage of the photovoltaic power generation device is greater than or equal to the direct current bus voltage of the photovoltaic energy storage power supply system.
8. The utility model provides a black start control device, is applied to photovoltaic energy storage power supply system, includes photovoltaic power generation device, direct current bus, bus capacitance and start control module, start control module connects through first weak power direct current bus for control whether photovoltaic energy storage power supply system starts, a serial communication port, black start control device connects through the weak power of second photovoltaic power generation device, black start control device includes:
the first control module is used for controlling the photovoltaic power generation device to generate power and continuously set time length after the output voltage of the photovoltaic power generation device meets a preset condition, and charging a bus capacitor of the photovoltaic energy storage and power supply system;
and the second control module is used for controlling the power-on state of the starting control module according to the electric quantity stored by the bus capacitor, and further controlling whether the photovoltaic energy storage power supply system is started or not.
9. A photovoltaic energy storage and power supply system, characterized in that the photovoltaic energy storage and power supply system comprises: the photovoltaic power generation device, direct current bus, bus electric capacity and start control module, start control module pass through first weak power connection direct current bus for whether control photovoltaic energy storage power supply system starts, still include claim 8 the black start controlling means.
10. The photovoltaic energy storage and power supply system of claim 9, further comprising: a boost circuit connected between the photovoltaic power generation device and the dc bus, including:
the first inductor and the first switching tube are connected in series and then are arranged between a positive terminal of the photovoltaic power generation device and a positive line of the direct current bus;
and a second switch tube, wherein a first pole of the second switch tube is connected between the first inductor and the first switch tube, and a second pole of the second switch tube is connected between a negative terminal of the photovoltaic power generation device and a negative line of the direct current bus.
11. The photovoltaic energy storage and power supply system of claim 9, further comprising:
the third switching tube is connected with the first resistor in series and then connected between the positive line and the negative line of the direct current bus, and the third switching tube and the first resistor are used for controlling the bus capacitor to discharge.
12. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 7.
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