WO2022087955A1 - 光伏系统母线电压控制方法及装置 - Google Patents
光伏系统母线电压控制方法及装置 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
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- 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
-
- 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
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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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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- 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
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/14—Energy storage units
Definitions
- the present application relates to power electronics technology, and in particular to a method and device for controlling the busbar voltage of a photovoltaic system.
- Photovoltaic power generation refers to the use of the photovoltaic effect of semiconductor materials to convert solar radiation energy into electrical energy, such as generating direct current under sunlight through photovoltaic modules.
- Photovoltaic modules are the core part of photovoltaic power generation systems. Several single solar cells are connected in series and parallel and then packaged into a single module, which is used to convert solar energy into electrical energy. A plurality of photovoltaic modules are connected in series and parallel to form a solar photovoltaic array.
- a photovoltaic power generation system energy is supplied to the load by a solar photovoltaic array. Affected by light and environmental factors, the energy provided by the solar photovoltaic array fluctuates, and the maximum power point tracking (MPPT) technology can be used to track the output voltage and current to obtain the maximum photovoltaic power.
- MPPT maximum power point tracking
- the excess energy can be stored or fed into the AC grid.
- the photovoltaic power generation system needs to control the charging and discharging power of the energy storage device to match the change of the load.
- the charging and discharging power of the energy storage device is calculated according to the busbar voltage, and there is a linear relationship between the busbar voltage and the charging power, and between the busbar voltage and the discharging power.
- the inverter bus capacitance is often large, it is necessary to gradually adjust the bus voltage to a specified range.
- the conversion efficiency of the converter is not high, the system revenue is reduced, and it is not conducive to quickly adjust the bus voltage to realize the control of the charging and discharging power to match the change of the load.
- the purpose of the present application is to provide a bus voltage control method of a photovoltaic system
- the photovoltaic system includes a DC/DC converter and a DC/AC converter, wherein the DC/DC converter, the DC/AC converter And the energy storage battery is connected through the bus, the DC/DC converter is connected with the photovoltaic DC source and performs maximum power tracking MPPT on the input power from the photovoltaic DC source, and the load connected with the DC/AC converter has a load power, the energy storage battery has a maximum power for charging and a maximum power for discharging.
- the method includes: controlling the busbar voltage in a plurality of different and discontinuous voltage intervals according to different results of the comparison between the photovoltaic maximum power and the load power and the charging maximum power and the discharging maximum power, wherein , the different and discontinuous voltage intervals correspond to different working states of the inverter.
- the switching of the working state of the inverter is realized by controlling the bus voltage to be in different and discontinuous voltage intervals, which is beneficial to stability and flexibility.
- the conversion efficiency can be reduced, and the operating range of the inverter can be reduced, thereby improving the inverter efficiency and improving the system revenue.
- embodiments of the present application provide a method for controlling a bus voltage of a photovoltaic system, where the photovoltaic system includes a DC/DC converter and a DC/AC converter, wherein the DC/DC converter, the DC The /AC converter and the energy storage battery are connected through the bus bar, the DC/DC converter is connected to the photovoltaic DC source and performs maximum power tracking MPPT on the input power from the photovoltaic DC source, and is connected to the DC/AC converter
- the load has a load power
- the energy storage battery has a maximum power for charging and a maximum power for discharging.
- the method includes: controlling the busbar voltage in a plurality of different and discontinuous voltage intervals according to different results of the comparison between the photovoltaic maximum power and the load power and the charging maximum power and the discharging maximum power, wherein , the different and discontinuous voltage intervals correspond to different working states of the inverter.
- the technical solution described in the first aspect realizes the switching of the working state of the inverter by controlling the bus voltage in a plurality of different and discontinuous voltage intervals, which is beneficial to stability and flexibility.
- the different results of the comparison between the load powers and the maximum charging power and the maximum discharging power are used to control the bus voltage, which realizes the fast power balance in the load mutation scenario, and also realizes the fast response to the change of the charging and discharging power of the energy storage battery. Therefore, it is beneficial to improve the conversion efficiency of the inverter, reduce the working range of the inverter, thereby improving the efficiency of the inverter and improving the system revenue.
- the bus voltage is controlled to be
- the multiple voltage intervals that are not identical and discontinuous include: when the maximum photovoltaic power is greater than the load power and the maximum photovoltaic power minus the load power is greater than the charging maximum power, controlling the bus voltage Work in the first voltage interval, wherein the first voltage interval corresponds to the BST side bus voltage reference value, wherein, when the working state of the inverter is in the state corresponding to the BST side bus voltage reference value, the The energy storage battery is in a charging state and the charging power of the energy storage battery reaches the maximum charging power, and the photovoltaic output power of the photovoltaic DC source is less than the photovoltaic maximum power, wherein the photovoltaic output power of the photovoltaic DC source It is equal to the sum of the load power and the charging maximum power.
- the inverter can be switched to a corresponding working state by controlling the bus voltage within a specific voltage interval.
- the bus voltage is controlled to be
- the different and discontinuous multiple voltage intervals include: when the maximum photovoltaic power is greater than the load power and the maximum photovoltaic power minus the load power is less than the charging maximum power, controlling the bus voltage work in the second voltage interval, wherein the second voltage interval corresponds to the reference value of the charging busbar voltage of the energy storage battery, wherein, when the working state of the inverter is at the reference value corresponding to the charging busbar voltage of the energy storage battery state, the energy storage battery is in a charging state and the charging power of the energy storage battery is less than the maximum charging power, and the photovoltaic output power provided by the photovoltaic DC source reaches the photovoltaic maximum power, wherein the energy storage battery The charging power of the battery is equal to the photovoltaic maximum power minus the load power.
- the inverter can be switched to a corresponding working state by controlling the bus voltage within a specific voltage interval.
- the bus voltage is controlled to be
- the different and discontinuous multiple voltage intervals include: when the maximum photovoltaic power is less than the load power and the maximum photovoltaic power minus the load power is less than the maximum discharge power, controlling the bus voltage work in a third voltage interval, wherein the third voltage interval corresponds to the INV side bus voltage reference value, wherein, when the working state of the inverter is in the state corresponding to the INV side bus voltage reference value, The energy storage battery is in a discharge state and the discharge power of the energy storage battery reaches the maximum discharge power, the photovoltaic output power provided by the photovoltaic DC source reaches the photovoltaic maximum power, and the load obtains compensation power from the AC grid , the compensation power is equal to the load power minus the photovoltaic maximum power plus the discharge maximum power.
- the inverter can be switched to a corresponding working state by controlling the bus voltage within a specific voltage interval.
- the bus voltage is controlled to be
- the different and discontinuous multiple voltage intervals include: when the maximum photovoltaic power is less than the load power and the maximum photovoltaic power minus the load power is greater than the discharge maximum power, controlling the bus voltage work in the fourth voltage interval, wherein the fourth voltage interval corresponds to the reference value of the discharge bus voltage of the energy storage battery, wherein, when the working state of the inverter is in the corresponding value of the discharge bus voltage of the energy storage battery When the energy storage battery is in a discharge state, the discharge power of the energy storage battery is greater than the maximum discharge power, the photovoltaic output power provided by the photovoltaic DC source reaches the maximum photovoltaic power, and the energy storage battery The discharge power is equal to the photovoltaic maximum power minus the load power.
- the inverter can be switched to a corresponding working state by controlling the bus voltage within a specific voltage interval.
- the bus voltage is controlled to be
- the multiple voltage intervals that are not identical and discontinuous include: when the maximum photovoltaic power is greater than the load power and the maximum photovoltaic power minus the load power is greater than the charging maximum power, controlling the bus voltage Working in a first voltage interval, wherein the first voltage interval corresponds to the reference value of the busbar voltage on the BST side, when the maximum photovoltaic power is greater than the load power and the maximum photovoltaic power minus the load power is less than the charging At the maximum power, the busbar voltage is controlled to work in a second voltage interval, wherein the second voltage interval corresponds to the reference value of the energy storage battery charging busbar voltage, when the maximum photovoltaic power is less than the load power and the photovoltaic maximum When the power minus the load power is less than the discharge maximum power, the busbar voltage is controlled to be
- the inverter can be switched to a corresponding working state by controlling the bus voltage in different voltage intervals according to the different results of the comparison between the photovoltaic maximum power and the load power and the charging maximum power and the discharging maximum power .
- a BST side bus voltage loop control command is generated according to the bus voltage sampling value of the inverter and the BST side bus voltage reference value, for controlling the inverter
- the output power of the inverter is used to stabilize the bus voltage at the BST side bus voltage reference value
- the INV side bus voltage loop control command is generated according to the bus voltage sample value and the INV side bus voltage reference value, for Controlling the output power of the inverter so that the bus voltage is stable at the INV side bus voltage reference value
- a voltage loop control instruction used to control the charging power of the energy storage battery so that the bus voltage is stabilized at the reference value of the charging bus voltage of the energy storage battery; according to the bus voltage sampling value and the energy storage battery discharge
- the bus voltage reference value generates an energy storage battery discharge bus voltage loop control command for controlling the discharge power of the energy storage battery so that the bus voltage is stabilized at the energy storage battery discharge bus voltage
- the BST side bus voltage loop control instruction, the INV side bus voltage loop control instruction, the energy storage battery charging bus voltage loop control instruction and all The above-mentioned energy storage battery discharge bus voltage loop control commands all use PI controllers.
- the bus voltage is controlled to be
- the multiple voltage intervals that are not identical and discontinuous include: when the maximum photovoltaic power is less than the load power and the maximum photovoltaic power minus the load power is greater than the maximum discharge power, or, when the When the photovoltaic maximum power is greater than the load power and the photovoltaic maximum power minus the load power is less than the charging maximum power, the busbar voltage is controlled to work in a fifth voltage interval, wherein the fifth voltage interval corresponds to the storage battery.
- the photovoltaic output power provided by the photovoltaic DC source reaches the specified value.
- the photovoltaic maximum power, the photovoltaic maximum power minus the load power is less than the charging maximum power and greater than the discharging maximum power.
- the inverter can be switched to the corresponding working state by controlling the bus voltage in different voltage intervals according to the different results of the comparison between the photovoltaic maximum power and the load power and the charging maximum power and the discharging maximum power .
- the bus voltage is controlled to be
- the multiple voltage intervals that are not identical and discontinuous include: when the maximum photovoltaic power is greater than the load power and the maximum photovoltaic power minus the load power is greater than the charging maximum power, controlling the bus voltage Working in the first voltage interval, wherein the first voltage interval corresponds to the reference value of the busbar voltage on the BST side, when the maximum photovoltaic power is less than the load power and the maximum photovoltaic power minus the load power is less than the discharge
- the busbar voltage is controlled to work in a third voltage interval, wherein the third voltage interval corresponds to the INV side busbar voltage reference value, when the photovoltaic maximum power is less than the load power and the photovoltaic maximum power When the load power minus the load power is greater than the discharge maximum power, or, when the photovoltaic maximum
- the inverter can be switched to a corresponding working state by controlling the bus voltage in different voltage intervals according to the different results of the comparison between the photovoltaic maximum power and the load power and the charging maximum power and the discharging maximum power .
- a BST-side bus-bar voltage loop control command is generated according to a bus-bar voltage sampling value of the inverter and a BST-side bus-bar voltage reference value, for controlling the inverter output power to make the bus voltage stable at the BST side bus voltage reference value; generate an INV side bus voltage loop control command according to the bus voltage sampling value and the INV side bus voltage reference value to control the reverse
- the output power of the inverter is used to stabilize the bus voltage at the INV side bus voltage reference value;
- the energy storage battery charge and discharge bus voltage loop control is generated according to the bus voltage sampling value and the energy storage battery charge and discharge bus voltage reference value
- the instruction is used to control the charging and discharging power of the energy storage battery so that the bus voltage is stabilized at a reference value of the charging and discharging bus voltage of the energy storage battery.
- the BST side bus voltage loop control instruction, the INV side bus voltage loop control instruction and the energy storage battery charging and discharging bus voltage loop control instruction are all Adopt PI controller.
- the maximum charging power and the maximum discharging power are preset.
- the embodiments of the present application provide a photovoltaic system.
- the photovoltaic system includes: a DC/DC converter; a DC/AC converter, wherein the DC/DC converter, the DC/AC converter and the energy storage battery are connected through a bus, the DC/DC converter Connected to a photovoltaic DC source and performing maximum power tracking MPPT on the input power from the photovoltaic DC source, a load connected to the DC/AC converter has load power, and the energy storage battery has a maximum power for charging and a maximum power for discharging ; and bus voltage controller.
- the bus voltage controller is used to: control the bus voltage to be at different and discontinuous levels according to different results of the comparison between the photovoltaic maximum power and the load power and the charging maximum power and the discharging maximum power. voltage intervals, wherein the different and discontinuous voltage intervals correspond to different working states of the inverter.
- the switching of the working state of the inverter is realized by controlling the bus voltage in a plurality of different and discontinuous voltage intervals, which is beneficial to stability and flexibility.
- the different results of the comparison between the load powers and the maximum charging power and the maximum discharging power are used to control the bus voltage, which realizes the fast power balance in the load mutation scenario, and also realizes the fast response to the change of the charging and discharging power of the energy storage battery. Therefore, it is beneficial to improve the conversion efficiency of the inverter, reduce the working range of the inverter, thereby improving the efficiency of the inverter and improving the system revenue.
- the bus voltage is controlled to be
- the multiple voltage intervals that are not identical and discontinuous include: when the maximum photovoltaic power is greater than the load power and the maximum photovoltaic power minus the load power is greater than the charging maximum power, controlling the bus voltage Work in the first voltage interval, wherein the first voltage interval corresponds to the BST side bus voltage reference value, wherein, when the working state of the inverter is in the state corresponding to the BST side bus voltage reference value, the The energy storage battery is in a charging state and the charging power of the energy storage battery reaches the maximum charging power, and the photovoltaic output power of the photovoltaic DC source is less than the photovoltaic maximum power, wherein the photovoltaic output power of the photovoltaic DC source It is equal to the sum of the load power and the charging maximum power.
- the inverter can be switched to a corresponding working state by controlling the bus voltage within a specific voltage interval.
- the bus voltage is controlled to be
- the different and discontinuous multiple voltage intervals include: when the maximum photovoltaic power is greater than the load power and the maximum photovoltaic power minus the load power is less than the charging maximum power, controlling the bus voltage work in the second voltage interval, wherein the second voltage interval corresponds to the reference value of the charging busbar voltage of the energy storage battery, wherein, when the working state of the inverter is at the reference value corresponding to the charging busbar voltage of the energy storage battery state, the energy storage battery is in a charging state and the charging power of the energy storage battery is less than the maximum charging power, and the photovoltaic output power provided by the photovoltaic DC source reaches the photovoltaic maximum power, wherein the energy storage battery The charging power of the battery is equal to the photovoltaic maximum power minus the load power.
- the inverter can be switched to a corresponding working state by controlling the bus voltage within a specific voltage interval.
- the bus voltage is controlled to be
- the different and discontinuous multiple voltage intervals include: when the maximum photovoltaic power is less than the load power and the maximum photovoltaic power minus the load power is less than the maximum discharge power, controlling the bus voltage work in a third voltage interval, wherein the third voltage interval corresponds to the INV side bus voltage reference value, wherein, when the working state of the inverter is in the state corresponding to the INV side bus voltage reference value, The energy storage battery is in a discharge state and the discharge power of the energy storage battery reaches the maximum discharge power, the photovoltaic output power provided by the photovoltaic DC source reaches the photovoltaic maximum power, and the load obtains compensation power from the AC grid , the compensation power is equal to the load power minus the photovoltaic maximum power plus the discharge maximum power.
- the inverter can be switched to a corresponding working state by controlling the bus voltage within a specific voltage interval.
- the bus voltage is controlled to be
- the different and discontinuous multiple voltage intervals include: when the maximum photovoltaic power is less than the load power and the maximum photovoltaic power minus the load power is greater than the discharge maximum power, controlling the bus voltage work in the fourth voltage interval, wherein the fourth voltage interval corresponds to the reference value of the discharge bus voltage of the energy storage battery, wherein, when the working state of the inverter is in the corresponding value of the discharge bus voltage of the energy storage battery When the energy storage battery is in a discharge state, the discharge power of the energy storage battery is greater than the maximum discharge power, the photovoltaic output power provided by the photovoltaic DC source reaches the maximum photovoltaic power, and the energy storage battery The discharge power is equal to the photovoltaic maximum power minus the load power.
- the inverter can be switched to a corresponding working state by controlling the bus voltage within a specific voltage interval.
- the bus voltage is controlled to be
- the multiple voltage intervals that are not identical and discontinuous include: when the maximum photovoltaic power is greater than the load power and the maximum photovoltaic power minus the load power is greater than the charging maximum power, controlling the bus voltage Working in a first voltage interval, wherein the first voltage interval corresponds to the reference value of the busbar voltage on the BST side, when the maximum photovoltaic power is greater than the load power and the maximum photovoltaic power minus the load power is less than the charging At the maximum power, the busbar voltage is controlled to work in a second voltage interval, wherein the second voltage interval corresponds to the reference value of the energy storage battery charging busbar voltage, when the maximum photovoltaic power is less than the load power and the photovoltaic maximum When the power minus the load power is less than the discharge maximum power, the busbar voltage is controlled to be
- the inverter can be switched to the corresponding working state by controlling the bus voltage in different voltage intervals according to the different results of the comparison between the photovoltaic maximum power and the load power and the charging maximum power and the discharging maximum power .
- the bus voltage controller is further configured to: generate a BST side bus voltage loop according to the bus voltage sampling value of the inverter and the BST side bus voltage reference value
- a circuit control instruction is used to control the output power of the inverter so that the bus voltage is stable at the BST side bus voltage reference value
- INV is generated according to the bus voltage sampling value and the INV side bus voltage reference value side bus voltage loop control instruction, used to control the output power of the inverter to make the bus voltage stable at the INV side bus voltage reference value
- the bus voltage reference value generates an energy storage battery charging bus voltage loop control command, which is used to control the charging power of the energy storage battery so that the bus voltage is stabilized at the energy storage battery charging bus voltage reference value
- the voltage sampling value and the energy storage battery discharge bus voltage reference value generate an energy storage battery discharge bus voltage loop control command, which is used to control the discharge power of the energy storage battery so that the bus voltage is stable at the energy
- the BST side bus voltage loop control instruction, the INV side bus voltage loop control instruction, the energy storage battery charging bus voltage loop control instruction and all The above-mentioned energy storage battery discharge bus voltage loop control commands all use PI controllers.
- the bus voltage is controlled to be
- the multiple voltage intervals that are not identical and discontinuous include: when the maximum photovoltaic power is less than the load power and the maximum photovoltaic power minus the load power is greater than the maximum discharge power, or, when the When the photovoltaic maximum power is greater than the load power and the photovoltaic maximum power minus the load power is less than the charging maximum power, the busbar voltage is controlled to work in a fifth voltage interval, wherein the fifth voltage interval corresponds to the storage battery.
- the photovoltaic output power provided by the photovoltaic DC source reaches the specified value.
- the photovoltaic maximum power, the photovoltaic maximum power minus the load power is less than the charging maximum power and greater than the discharging maximum power.
- the inverter can be switched to the corresponding working state by controlling the bus voltage in different voltage intervals according to the different results of the comparison between the photovoltaic maximum power and the load power and the charging maximum power and the discharging maximum power .
- the bus voltage is controlled to be
- the multiple voltage intervals that are not identical and discontinuous include: when the maximum photovoltaic power is greater than the load power and the maximum photovoltaic power minus the load power is greater than the charging maximum power, controlling the bus voltage Working in the first voltage interval, wherein the first voltage interval corresponds to the reference value of the busbar voltage on the BST side, when the maximum photovoltaic power is less than the load power and the maximum photovoltaic power minus the load power is less than the discharge
- the busbar voltage is controlled to work in a third voltage interval, wherein the third voltage interval corresponds to the INV side busbar voltage reference value, when the photovoltaic maximum power is less than the load power and the photovoltaic maximum power When the load power minus the load power is greater than the discharge maximum power, or, when the photovoltaic maximum
- the inverter can be switched to a corresponding working state by controlling the bus voltage in different voltage intervals according to the different results of the comparison between the photovoltaic maximum power and the load power and the charging maximum power and the discharging maximum power .
- the bus voltage controller is further configured to: generate a BST side bus voltage loop control according to the bus voltage sampling value of the inverter and the BST side bus voltage reference value an instruction for controlling the output power of the inverter so that the bus voltage is stabilized at the BST side bus voltage reference value; generating an INV side bus voltage loop according to the bus voltage sampling value and the INV side bus voltage reference value A circuit control instruction is used to control the output power of the inverter so that the bus voltage is stable at the INV side bus voltage reference value; generated according to the bus voltage sampling value and the energy storage battery charge and discharge bus voltage reference value The energy storage battery charging and discharging bus voltage loop control instruction is used to control the charging and discharging power of the energy storage battery so that the bus voltage is stabilized at the charging and discharging bus voltage reference value of the energy storage battery.
- the BST side bus voltage loop control command, the INV side bus voltage loop control command and the energy storage battery charging and discharging bus voltage loop control command are all Adopt PI controller.
- the maximum charging power and the maximum discharging power are preset.
- FIG. 1 is a structural block diagram of a photovoltaic power generation system including an inverter bus voltage controller provided by an embodiment of the present application.
- FIG. 2 is a schematic flowchart of a method for controlling an inverter bus voltage in a first implementation manner provided by an embodiment of the present application.
- FIG. 3 is a schematic diagram of controlling the inverter bus voltage according to the method shown in FIG. 2 according to an embodiment of the present application.
- FIG. 4 is a schematic flowchart of a method for controlling an inverter bus voltage in a second implementation manner provided by an embodiment of the present application.
- FIG. 5 is a schematic diagram of controlling the inverter bus voltage according to the method shown in FIG. 4 according to an embodiment of the present application.
- An embodiment of the present application provides a method for controlling a bus voltage of a photovoltaic system, where the photovoltaic system includes a DC/DC converter and a DC/AC converter, wherein the DC/DC converter, the DC/AC converter And the energy storage battery is connected through the bus, the DC/DC converter is connected with the photovoltaic DC source and performs maximum power tracking MPPT on the input power from the photovoltaic DC source, and the load connected with the DC/AC converter has a load power, the energy storage battery has a maximum power for charging and a maximum power for discharging.
- the method includes: controlling the busbar voltage in a plurality of different and discontinuous voltage intervals according to different results of the comparison between the photovoltaic maximum power and the load power and the charging maximum power and the discharging maximum power, wherein , the different and discontinuous voltage intervals correspond to different working states of the inverter.
- the switching of the working state of the inverter is realized by controlling the bus voltage to be in different and discontinuous voltage intervals, which is beneficial to stability and flexibility.
- the conversion efficiency can be reduced, and the operating range of the inverter can be reduced, thereby improving the inverter efficiency and improving the system revenue.
- the embodiments of the present application can be used in the following application scenarios, including but not limited to, photovoltaic inverters, photovoltaic power generation systems, and other application scenarios that need to achieve fast balance of load power and fast response of energy storage batteries.
- FIG. 1 is a structural block diagram of a photovoltaic power generation system including an inverter bus voltage controller provided by an embodiment of the present application.
- the photovoltaic power generation system 100 includes a solar photovoltaic array 102 , an inverter 120 , an energy storage battery 108 , a load 110 , and an electricity meter 112 .
- the solar photovoltaic array 102 is composed of a plurality of photovoltaic modules in series and parallel. Each photovoltaic module converts solar radiation energy into direct current according to the photovoltaic power generation effect.
- Inverter 120 includes DC/DC converter 104 and DC/AC converter 106 .
- the DC/DC converter 104 is located on the BST side of the inverter 120, that is, corresponding to the DC-DC conversion part of the inverter 120
- the DC/AC converter 106 is located on the INV side of the inverter 120, that is, corresponding to The DC-AC conversion part of the inverter 120 . It should be understood that the DC/DC converter 104 and the DC/AC converter 106 may be integrated into one device, or may be divided into multiple devices.
- the inverter may be a device that internally includes at least one DC/DC converter and at least one DC/AC converter, or it may be For multiple devices, the DC/DC converter is one device, the DC/AC converter is another device, and at least one DC/DC converter and at least one DC/AC converter together form an inverter.
- the specific embodiment of the present application is that the inverter is composed of a DC/DC converter plus a DC/AC converter. These can be adjusted and improved according to the actual situation, which is not specifically limited in this application.
- the DC/DC converter 104 can fully function as a photovoltaic power optimizer, as an independent optimizer product, connected between photovoltaic direct current sources (including photovoltaic direct current sources such as photovoltaic panels and photovoltaic arrays) and inverter between the devices.
- photovoltaic direct current sources including photovoltaic direct current sources such as photovoltaic panels and photovoltaic arrays
- the DC input side of the DC/DC converter 104 is connected to the solar photovoltaic array 102 , and converts the direct current output from the solar photovoltaic array 102 into a suitable direct current to meet the working requirements of the DC/AC converter 106 .
- the maximum power point tracking MPPT control strategy is implemented to obtain the photovoltaic maximum power of the solar photovoltaic array 102 , and then output from the DC output side of the DC/DC converter 104 .
- the DC output side of the DC/DC converter 104 is connected to the DC input side of the DC/AC converter 106 .
- the DC/AC converter 106 converts the received DC power into AC power and outputs it from the AC output side of the DC/AC converter 106 .
- the coupling point between the DC output side of the DC/DC converter 104 and the DC input side of the DC/AC converter 106 is a bus bar (hereinafter referred to as BUS).
- BUS bus bar
- the energy storage battery 108 can be connected to the bus of the inverter 120 , that is, the energy storage battery 108 can be connected between the DC/DC converter 104 and the DC/AC converter 106 .
- the inverter 120 outputs the electric energy to the load 110 , and is connected to the AC power grid 114 after passing through the electric meter 112 .
- the load 110 may be powered by the inverter 120 , may also be powered by the AC grid 114 , or may be powered by the inverter 120 and the AC grid 114 at the same time.
- the electricity meter 112 is used to detect the power obtained from the AC power grid 114.
- the photovoltaic power generation system 100 is configured to be connected to the grid with zero power, it means that the photovoltaic power generation system 100 will not feed back power to the AC power grid 114, and the reading of the power meter 112 is greater than or equal to zero.
- the DC/DC converter 104 the DC/AC converter 106 and the energy storage battery 108 are coupled and connected to the bus bar of the inverter 120 .
- the DC bus refers to the positive and negative connections between the DC/DC converter 104 and the DC/AC converter 106
- the DC bus capacitor refers to the capacitor located between the DC bus
- the DC bus voltage refers to the It is the voltage between the positive and negative terminals of the DC bus, that is, the voltage applied across the DC bus capacitor.
- the connection lines shown in FIG. 1 are used to indicate the flow of electric energy, and the descriptions of each mark are as follows:
- P PV represents the photovoltaic output power, that is, the actual output power of the solar photovoltaic array 102 .
- P PV_MPP (not shown) represents the photovoltaic maximum power, that is, the maximum power that the solar photovoltaic array 102 can output under the MPPT control strategy, that is, the MPPT-based photovoltaic maximum power obtained by the DC/DC converter 104 .
- P BAT represents the charging and discharging power of the energy storage battery 108 , which can be expressed uniformly by a value with a positive and negative sign, wherein the positive value represents charging and the negative value represents discharging.
- PINV represents the output power of the inverter 120 , which is also the power of the AC output provided by the DC/AC converter 106 .
- P LOAD represents the load power of the load 110 .
- P Meter means that the power meter 112 detects the power obtained from the AC power grid, which can be expressed uniformly by a value with a positive and negative sign, wherein positive means taking power from the AC power grid and negative means feeding power to the AC power grid.
- Inverter 120 receives photovoltaic output power P PV from solar photovoltaic array 102 and outputs power P INV .
- the meter power P Meter is greater than or equal to 0, and no electricity is fed to the grid.
- the inverter 120 also includes a bus voltage controller 122 for implementing a loop competition strategy.
- the bus voltage controller 122 may be provided in the inverter 120 or may be provided separately.
- the bus voltage controller 122 is connected in communication with the energy storage battery 108 to control the charging and discharging power of the energy storage battery 108, and also has the necessary hardware structure to obtain the bus voltage sampling value.
- bus voltage controller 122 has the basic structure of a processor and memory to perform the required detection and control functions, as well as to store program codes for loop contention strategies, or to have the circuitry and circuitry required to implement the control functions. element.
- the specific structure and function of the bus voltage controller 122 can be set or improved according to specific application scenarios, which are not specifically limited herein.
- the inverter 120 needs to control the storage based on the power data of the electric meter 112. The charge and discharge power of the battery 108 can be used to match these changes.
- the inverter 120 also includes a bus voltage controller 122 for performing MPPT of the solar photovoltaic array to obtain the photovoltaic maximum input power P PV_MPP and output power P INV .
- the bus voltage controller 122 is also communicatively connected to the energy storage battery 108 to control the charging and discharging power P BAT of the energy storage battery 108 .
- the bus voltage controller 122 obtains the bus voltage sampling value of the inverter 120, and implements a loop competition strategy, thereby determining the control right of the bus voltage, and performing energy management accordingly. It should be understood that the bus voltage controller 122 has a processor and memory architecture to perform the required detection and control functions, as well as to store program code for loop contention strategies, or has the circuits and components required to implement the control functions . The bus voltage controller 122 obtains the bus voltage sampling value and detects the output power P INV of the inverter 120 , which can be performed by appropriate technical means in the prior art, which is not specifically limited here.
- the solar photovoltaic array 102 may be any DC source capable of obtaining maximum power according to the MPPT control strategy. These can be adjusted and improved according to specific application environments, which are not specifically limited here.
- the DC/DC converter 104 achieves MPPT control of the DC input provided by the solar photovoltaic array 102 through a fixed voltage method, a disturbance observation method, or a conductance increment method to obtain maximum photovoltaic power.
- the DC-DC converter 104 may adopt a pulse width modulation method, may include necessary elements such as a control chip, an inductor and a capacitor, and may be a boost, a buck, or a boost and a boost. These can be adjusted and improved according to specific application environments, which are not specifically limited here.
- the DC/AC converter 106 may be a single-phase inverter, or a three-phase inverter, or may be other types of inverter circuits capable of converting direct current to alternating current. These can be adjusted and improved according to specific application environments, which are not specifically limited here.
- FIG. 2 is a schematic flowchart of a method for controlling an inverter bus voltage in a first implementation manner provided by an embodiment of the present application. As shown in Figure 2, the control method includes the following steps.
- Step S200 Generate a BST side bus voltage loop control command according to the bus voltage sampling value of the inverter and the BST side bus voltage reference value, which is used to control the output power of the inverter so that the bus voltage is stable on the BST side Bus voltage reference.
- the inverter includes a DC/DC converter and a DC/AC converter.
- the DC input side of the DC/AC converter is connected to the solar photovoltaic array, and the coupling point between the DC output side of the DC/AC converter and the DC input side of the DC/AC converter is a bus.
- the DC input side of the DC/AC converter is connected to the solar photovoltaic array, converts the direct current output from the solar photovoltaic array into a suitable direct current to meet the working requirements of the DC/AC converter, and performs maximum power point tracking for the direct current provided by the solar photovoltaic array.
- the MPPT control strategy thus obtains the maximum photovoltaic power of the solar photovoltaic array.
- the energy storage battery can be connected to the busbar of the inverter, that is, the energy storage battery can be connected between the DC/DC converter and the DC/AC converter.
- the solar photovoltaic array can be any DC source that can obtain maximum power according to the MPPT control strategy. These can be adjusted and improved according to specific application environments, which are not specifically limited here.
- the generation of the BST side bus voltage loop control command can be in the form of a proportional-integral controller (Proportional Integral Controller, PI), and according to the following formulas (1) and (2).
- PI Proportional Integral Controller
- t represents the time
- U REF_BST represents the reference value of the bus voltage on the BST side
- U BUS (t) represents the sampled value of the bus voltage
- e(t) represents the difference between the reference value of the bus voltage on the BST side and the sampled value of the bus voltage
- P BST ( t) represents the output power of the inverter under the BST side bus voltage loop control command so that the bus voltage is stabilized at the BST side bus voltage reference value U REF_BST
- K p represents the proportional adjustment coefficient
- K i represents the integral adjustment coefficient.
- the stable bus voltage at the BST side bus voltage reference value means that the bus voltage fluctuation, jitter, ripple or multiple different voltage values are limited to a certain interval, wherein the upper limit of each interval or There is a measurable difference between the lower limit and the lower or upper limit of other intervals, so that each interval has clear definitions and boundaries.
- the bus voltage can be sampled by directly detecting the voltage, measuring by a sampling resistor, or by other suitable technical means.
- the bus voltage can be stabilized at the bus voltage reference value U REF_BST on the BST side, which is beneficial to improve the inverter conversion efficiency, reduce the inverter operating range, and further improve the inverter efficiency and system revenue.
- the embodiment of the present application does not limit the controller to be a PI controller, and other controllers may be used as required.
- Step S202 Generate an INV side bus voltage loop control command according to the bus voltage sample value and the INV side bus voltage reference value, which is used to control the output power of the inverter so that the bus voltage is stable at the INV side Bus voltage reference.
- the generation of the INV side bus voltage loop control command can be in the form of a PI controller, and according to the following formulas (3) and (4).
- U REF_INV is the reference value of the bus voltage on the INV side
- U BUS (t) is the sampled value of the bus voltage
- e(t) is the difference between the reference value of the bus voltage on the INV side and the sampled value of the bus voltage
- P INV ( t) represents the output power of the inverter under the INV side bus voltage loop control command so that the bus voltage is stabilized at the INV side bus voltage reference value U REF_INV
- K p represents the proportional adjustment coefficient
- K i represents the integral adjustment coefficient.
- the bus voltage is stable at the INV side bus voltage reference value U REF_INV , which means that the jitter or ripple of the bus voltage is less than the threshold value, or that the average or effective value of the bus voltage is within a certain value. level remains constant.
- the bus voltage can be sampled by directly detecting the voltage, measuring by a sampling resistor, or by other suitable technical means.
- the bus voltage can be stabilized at the INV side bus voltage reference value U REF_INV , which is beneficial to improve the conversion efficiency of the inverter, reduce the working range of the inverter, and further improve the inverter efficiency and system revenue.
- the embodiment of the present application does not limit the controller to be a PI controller, and other controllers may be used as required.
- Step S204 Generate an energy storage battery charging bus voltage loop control command according to the bus voltage sampling value and the energy storage battery charging bus voltage reference value, which is used to control the charging power of the energy storage battery so that the bus voltage is stable at The reference value of the charging busbar voltage of the energy storage battery.
- the generation of the control command of the energy storage battery charging bus voltage loop can be in the form of a PI controller, and according to the following formulas (5) and (6).
- t represents the time
- U REF_CHARGE represents the reference value of the charging bus voltage of the energy storage battery
- U BUS (t) represents the sampling value of the bus voltage
- e(t) represents the difference between the reference value of the charging bus voltage of the energy storage battery and the sampling value of the bus voltage
- P BAT_CHARGE (t) represents the charging power of the energy storage battery under the control command of the energy storage battery charging bus voltage loop, so that the bus voltage is stabilized at the energy storage battery charging bus voltage reference value U REF_CHARGE
- K p represents the proportional adjustment coefficient
- K i represents the integral adjustment coefficient.
- the bus voltage is stable at the reference value U REF_CHARGE of the charging bus voltage of the energy storage battery, which means that the jitter or ripple of the bus voltage is less than the threshold value, or the average value or the effective value of the bus voltage. remain constant to a certain extent.
- the bus voltage can be sampled by directly detecting the voltage, measuring by a sampling resistor, or by other suitable technical means.
- the bus voltage can be stabilized at the reference value U REF_CHARGE of the charging bus voltage of the energy storage battery, which is beneficial to improve the conversion efficiency of the inverter, reduce the working range of the inverter, and further improve the efficiency of the inverter and the system revenue.
- the embodiment of the present application does not limit the controller to be a PI controller, and other controllers may be used as required.
- Step S206 Generate an energy storage battery discharge bus voltage loop control command according to the bus voltage sample value and the energy storage battery discharge bus voltage reference value, which is used to control the discharge power of the energy storage battery so that the bus voltage is stable at The energy storage battery discharge bus voltage reference value.
- the generation of the energy storage battery discharge bus voltage loop control command can be in the form of a PI controller, and according to the following formulas (7) and (8).
- U REF_DISCHARGE represents the reference value of the discharge bus voltage of the energy storage battery
- U BUS (t) represents the sampled value of the bus voltage
- e(t) represents the difference between the reference value of the discharge bus voltage of the energy storage battery and the sampled value of the bus voltage
- P BAT_DISCHARGE (t) represents the discharge power of the energy storage battery under the control command of the energy storage battery discharge bus voltage loop, so that the bus voltage is stabilized at the energy storage battery discharge bus voltage reference value U REF_DISCHARGE
- K p represents the proportional adjustment coefficient
- K i represents the integral adjustment coefficient.
- the bus voltage is stable at the energy storage battery discharge bus voltage reference value U REF_DISCHARGE , which means that the jitter or ripple of the bus voltage is less than the threshold, or the average value or effective value of the bus voltage. remain constant to a certain extent.
- the bus voltage can be sampled by directly detecting the voltage, by measuring by a sampling resistor, or by other suitable technical means.
- the bus voltage can be stabilized at the energy storage battery discharge bus voltage reference value U REF_DISCHARGE , which is beneficial to improve the conversion efficiency of the inverter and reduce the working range of the inverter, thereby improving the efficiency of the inverter and improving the system revenue.
- the embodiment of the present application does not limit the controller to be a PI controller, and other controllers may be used as required.
- Step S208 According to the comparison result between the maximum photovoltaic power, the load power, the charging maximum power and the discharging maximum power of the energy storage battery, select and execute the BST side bus voltage loop control instruction, and the INV side bus voltage loop control instruction, the energy storage battery charging bus voltage loop control instruction or the energy storage battery discharging bus voltage loop control instruction.
- the energy storage battery has a maximum charging power for indicating the maximum value of the charging power of the energy storage battery when the energy storage battery is in a charging state
- the energy storage battery has a maximum discharging power for indicating when the energy storage battery is in the charging state.
- the charging maximum power and the discharging maximum power are preset, for example, according to the application scenario of the inverter, or according to the design limit of the energy storage battery or the factory setting.
- the loop competition strategy in step S208 may be implemented by a controller or a control circuit of the inverter. The various loop control commands mentioned above can also be generated by the controller.
- the control right of the bus voltage is determined by the result of the loop competition, and the corresponding energy management is carried out, for example, the output power of the inverter or the charge and discharge power of the energy storage battery are controlled according to the result of the loop competition, and considering the The factor of load power change caused by load sudden change, so fast power balance can be realized in the load sudden change scenario.
- the loop competition strategy directly controls the relevant power and stabilizes the bus voltage to the reference voltage value through the loop competition result, which realizes the charging and discharging of the energy storage battery.
- the fast response to power changes is beneficial to improve the conversion efficiency of the inverter, reduce the working range of the inverter, and then improve the efficiency of the inverter and improve the system revenue.
- the loop competition strategy can be expressed as a series of judgments based on the maximum photovoltaic power, the load power, the maximum charging power and the maximum discharging power to select the loop control command to be executed:
- step S208 when the BST side bus voltage loop control instruction is selected to be executed, the energy storage battery is in a charging state and the charging power of the energy storage battery reaches the maximum charging power, and the photovoltaic output power is less than the maximum photovoltaic power, wherein , the photovoltaic output power is equal to the sum of the load power and the maximum charging power of the energy storage battery.
- the photovoltaic output power is calculated according to the following formulas (9) and (10).
- P LOAD represents the load power
- P BAT_CHARGE_MAX represents the maximum charging power
- P PV_MPP represents the maximum photovoltaic power
- P PV represents the photovoltaic output power under the control command of the bus voltage loop on the BST side.
- step S208 when the INV side bus voltage loop control instruction is selected to be executed, the energy storage battery is in a discharge state, the discharge power of the energy storage battery reaches the maximum discharge power, and the photovoltaic output power reaches the photovoltaic output power. Maximum power, the inverter obtains compensation power from the grid connected to the inverter, and the compensation power is equal to the load power minus the photovoltaic maximum power plus the discharge maximum power. Combined with step S202 and step S208, the compensation power is calculated according to the following formulas (11) and (12).
- P Meter represents the compensation power
- P LOAD represents the load power
- P PV_MPP represents the maximum photovoltaic power
- P PV represents the photovoltaic output power
- P BAT_DISCHARGE_MAX represents the maximum discharge power.
- step S208 when the energy storage battery charging bus voltage loop control command is selected to be executed, the energy storage battery is in a charging state, the charging power of the energy storage battery is less than the maximum charging power, and the photovoltaic output power reaches the required maximum power. the photovoltaic maximum power, and the charging power is equal to the photovoltaic maximum power minus the load power.
- the charging power is calculated according to the following formulas (13) and (14).
- P BAT_CHARGE represents the charging power
- P PV represents the photovoltaic output power
- P LOAD represents the load power
- P PV_MPP represents the photovoltaic maximum power.
- step S208 when the energy storage battery discharge bus voltage loop control command is selected to be executed, the energy storage battery is in a discharge state, the discharge power of the energy storage battery is greater than the maximum discharge power, and the photovoltaic output power reaches the required the maximum photovoltaic power, and the discharge power is equal to the maximum photovoltaic power minus the load power.
- the discharge power is calculated according to the following formulas (15) and (16).
- P BAT_DISCHARGE represents the discharge power
- P PV represents the photovoltaic output power
- P LOAD represents the load power
- P PV_MPP represents the maximum photovoltaic power.
- steps S200, S202, S204 and S206 may be adjusted or recombined with each other.
- This embodiment of the present application does not limit the sequence of the four steps. Steps S200 to S206 may be performed synchronously, and may be rearranged and combined in any order.
- the embodiment of the present application and FIG. 2 are only for the purpose of convenience of description, and step S200 to step S206 are introduced one by one.
- FIG. 3 is a schematic diagram of controlling the inverter bus voltage according to the method shown in FIG. 2 according to an embodiment of the present application.
- the Y-axis represents the charge and discharge power of the energy storage battery
- the positive direction that is, the upper half of the Y-axis
- the negative direction that is, the lower half of the Y-axis
- the maximum charge and discharge power is The value is 3kW/-3kW.
- the X-axis represents the corresponding bus voltage, as well as individual voltage references.
- the reference value of the busbar voltage on the BST side is marked as F, corresponding to 430V, also called the first voltage interval;
- the reference value of the charging busbar voltage of the energy storage battery is marked as C, corresponding to 410V, also called the second voltage interval;
- the energy storage battery The discharge bus voltage reference value is marked as D, corresponding to 390V, also called the third voltage interval;
- the INV side bus voltage reference value is marked as G, corresponding to 370V, also called the fourth voltage interval.
- the voltage interval is simplified to a single voltage value, and the difference between each voltage value is 20V, so that each interval has a clear definition and limit.
- the neutral voltage is marked as E, which corresponds to 400V. As shown in FIG.
- the BST side bus voltage reference value is greater than the energy storage battery charging bus voltage reference value
- the energy storage battery charging bus voltage reference value is greater than the energy storage battery discharging bus voltage reference value
- the The energy storage battery discharge bus voltage reference value is greater than the INV side bus voltage reference value.
- the maximum value of the charge and discharge power may be other values, such as 4kW/-4kW, or 5kW/-5kW. These can be adjusted and improved according to specific application environments, which are not specifically limited here.
- the various voltage reference values may be other values. These can be adjusted and improved according to specific application environments, which are not specifically limited here.
- FIG. 4 is a schematic flowchart of a method for controlling an inverter bus voltage in a second implementation manner provided by an embodiment of the present application. As shown in FIG. 4 , the control method includes the following steps.
- Step S400 Generate a BST side bus voltage loop control command according to the bus voltage sampling value of the inverter and the BST side bus voltage reference value, which is used to control the output power of the inverter so that the bus voltage is stable at the BST side bus voltage reference value.
- the inverter includes a DC/DC converter and a DC/AC converter.
- the DC input side of the DC/AC converter is connected to the solar photovoltaic array, the coupling point between the DC output side of the DC/AC converter and the DC input side of the DC/AC converter is the bus, the bus voltage is referred to as the bus voltage, and the bus voltage is sampled The value is referred to as the bus voltage sampling value.
- the DC input side of the DC/AC converter is connected to the solar photovoltaic array, converts the direct current output from the solar photovoltaic array into a suitable direct current to meet the working requirements of the DC/AC converter, and performs maximum power point tracking for the direct current provided by the solar photovoltaic array.
- the MPPT control strategy thus obtains the maximum photovoltaic power of the solar photovoltaic array.
- the energy storage battery can be connected to the busbar of the inverter, that is, the energy storage battery can be connected between the DC/DC converter and the DC/AC converter.
- the solar photovoltaic array can be any DC source that can obtain maximum power according to the MPPT control strategy.
- step S200 For the generation of the BST side bus voltage loop control command, please refer to step S200, which will not be repeated here.
- Step S402 Generate an INV side bus voltage loop control command according to the bus voltage sample value and the INV side bus voltage reference value, which is used to control the output power of the inverter so that the bus voltage is stable at the INV side Bus voltage reference.
- step S202 for the generation of the bus voltage loop control command on the INV side, which will not be repeated here.
- Step S404 Generate an energy storage battery charging and discharging bus voltage loop control command according to the bus voltage sampling value and the energy storage battery charging and discharging bus voltage reference value, which is used to control the charging and discharging power of the energy storage battery to make the bus The voltage is stabilized at the reference value of the charging and discharging busbar voltage of the energy storage battery.
- the generation of the voltage loop control command of the charging and discharging busbar of the energy storage battery can be in the form of a PI controller, and according to the following formulas (17) and (18).
- U REF_BAT represents the reference value of the charging and discharging busbar voltage of the energy storage battery or the reference value of the busbar voltage on the energy storage battery side
- U BUS (t) represents the sampling value of the bus voltage
- e(t) represents the charging and discharging value of the energy storage battery.
- the difference between the discharge bus voltage reference value and the bus voltage sampling value, P BAT (t) represents the charging and discharging power of the energy storage battery under the control command of the charging and discharging bus voltage loop of the energy storage battery, so that the bus voltage is stable at the
- K p represents the proportional adjustment coefficient
- K i represents the integral adjustment coefficient.
- the bus voltage is stable at the reference value U REF_BAT of the charging and discharging bus voltage of the energy storage battery, which means that the jitter or ripple of the bus voltage is less than the threshold value, or the average value or effective value of the bus voltage. The value remains constant to some extent.
- the bus voltage can be sampled by directly detecting the voltage, measuring by a sampling resistor, or by other suitable technical means.
- the bus voltage can be stabilized at the reference value U REF_BAT for the charging and discharging bus voltage of the energy storage battery, which is beneficial to improve the conversion efficiency of the inverter, reduce the working range of the inverter, and further improve the efficiency and efficiency of the inverter. Improve system profitability.
- controller does not limit the controller to be a PI controller, and other controllers may be used as required. It should be understood that the embodiment of the present application does not limit the controller to be a PI controller, and other controllers may be used as required.
- Step S406 According to the comparison result between the maximum photovoltaic power, the load power, the charging maximum power and the discharging maximum power of the energy storage battery, select and execute the BST side bus voltage loop control instruction, and the INV side bus voltage loop control instruction or the charging and discharging bus voltage loop control instruction of the energy storage battery.
- the energy storage battery has a maximum charging power for indicating the maximum value of the charging power of the energy storage battery when the energy storage battery is in a charging state
- the energy storage battery has a maximum discharging power for indicating when the energy storage battery is in the charging state.
- the charging maximum power and the discharging maximum power are preset, for example, according to the application scenario of the inverter, or according to the design limit of the energy storage battery or the factory setting.
- the loop competition strategy in step S406 may be implemented by a controller or a control circuit of the inverter. The various loop control commands mentioned above can also be generated by the controller.
- the control right of the bus voltage is determined by the result of the loop competition, and the corresponding energy management is carried out, for example, the output power of the inverter or the charge and discharge power of the energy storage battery are controlled according to the result of the loop competition, and considering the The factor of load power change caused by load sudden change, so fast power balance can be realized in the load sudden change scenario.
- the loop competition strategy directly controls the relevant power and stabilizes the bus voltage near the reference voltage value through the loop competition result, which realizes the charging of the energy storage battery.
- the rapid response to the change of the discharge power is beneficial to improve the conversion efficiency of the inverter, reduce the working range of the inverter, thereby improving the efficiency of the inverter and improving the system revenue.
- step S406 the loop competition strategy can be expressed as a series of judgments based on photovoltaic maximum power, load power, charging maximum power and discharging maximum power to select the loop control command to be executed:
- the energy storage battery charging and discharging bus voltage loop control command is selected to be executed.
- step S406 when the BST side bus voltage loop control instruction is selected to be executed, the relevant details are similar to those in step S208, and will not be repeated here.
- step S406 when the INV side busbar voltage loop control command is selected to be executed, the relevant details are similar to those in step S208, and will not be repeated here.
- step S406 when the energy storage battery charging and discharging bus voltage loop control instruction is selected to be executed, the DC source provides the photovoltaic maximum power, and the photovoltaic maximum power minus the load power is less than the charging power of the energy storage battery maximum power, and is greater than the maximum discharge power of the energy storage battery.
- the charging and discharging power of the energy storage battery is the actual output power of the DC source, that is, between the photovoltaic output power and the load power, and is charged or discharged according to the actual situation.
- the bus voltage Under the control command of the energy storage battery charging and discharging bus voltage loop, the bus voltage is stabilized at the energy storage battery charging and discharging bus voltage reference value U REF_BAT , and the DC source works at the maximum photovoltaic power.
- steps S400, S402 and S404 may be adjusted or recombined with each other.
- This embodiment of the present application does not limit the sequence of the three steps. Steps S400 to S404 may be performed synchronously, and may be rearranged and combined in any order.
- the embodiment of the present application and FIG. 4 are only for the purpose of convenience of description, and step S400 to step S404 are introduced one by one.
- FIG. 5 is a schematic diagram of controlling the inverter bus voltage according to the method shown in FIG. 4 according to an embodiment of the present application.
- the Y-axis represents the charge and discharge power of the energy storage battery
- the positive direction that is, the upper half of the Y-axis
- the negative direction that is, the lower half of the Y-axis
- the maximum charge and discharge power is The value is 3kW/-3kW.
- the X-axis represents the corresponding bus voltages, and the respective voltage references according to the first configuration.
- the reference value of the busbar voltage on the BST side is marked as F, corresponding to 430V, also called the fifth voltage interval;
- the reference value of the voltage on the energy storage battery side is marked as E, corresponding to 400V, also called the sixth voltage interval;
- the busbar voltage on the INV side is marked as the sixth voltage interval;
- the reference value is marked G, corresponding to 370V, also known as the seventh voltage interval.
- the configuration shown in FIG. 5 shows that the BST side bus voltage reference value is greater than the energy storage battery side voltage reference value, and the energy storage battery side voltage reference value is greater than the INV side bus voltage reference value. In this way, in conjunction with FIG. 4 and FIG.
- the maximum value of the charge and discharge power may be other values, such as 4kW/-4kW or 5kW/-5kW. These can be adjusted and improved according to specific application environments, which are not specifically limited here.
- the various voltage reference values may be other values. These can be adjusted and improved according to specific application environments, which are not specifically limited here.
- the specific embodiments provided herein may be implemented in any one or combination of hardware, software, firmware or solid state logic circuits, and may be implemented in conjunction with signal processing, control and/or special purpose circuits.
- the apparatus or apparatus provided by the specific embodiments of the present application may include one or more processors (eg, microprocessor, controller, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA) ), etc.), these processors process various computer-executable instructions to control the operation of a device or apparatus.
- the device or apparatus provided by the specific embodiments of the present application may include a system bus or a data transmission system that couples various components together.
- a system bus may include any one or a combination of different bus structures, such as a memory bus or memory controller, a peripheral bus, a universal serial bus, and/or processing utilizing any of a variety of bus architectures device or local bus.
- the equipment or apparatus provided by the specific embodiments of the present application may be provided independently, may be a part of a system, or may be a part of other equipment or apparatus.
- Embodiments provided herein may include or be combined with computer-readable storage media, such as one or more storage devices capable of providing non-transitory data storage.
- the computer-readable storage medium/storage device may be configured to hold data, programmers and/or instructions that, when executed by the processors of the apparatuses or apparatuses provided by the specific embodiments of the present application, cause these apparatuses Or the device realizes the relevant operation.
- Computer-readable storage media/storage devices may include one or more of the following characteristics: volatile, non-volatile, dynamic, static, read/write, read-only, random access, sequential access, location addressability, File addressability and content addressability.
- the computer-readable storage medium/storage device may be integrated into the device or apparatus provided by the specific embodiments of the present application or belong to a public system.
- Computer readable storage media/storage devices may include optical storage devices, semiconductor storage devices and/or magnetic storage devices, etc., and may also include random access memory (RAM), flash memory, read only memory (ROM), erasable and programmable Read Only Memory (EPROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Registers, Hard Disk, Removable Disk, Recordable and/or Rewritable Compact Disc (CD), Digital Versatile Disc (DVD), Mass storage media device or any other form of suitable storage media.
- RAM random access memory
- ROM read only memory
- EPROM erasable and programmable Read Only Memory
- EEPROM Electrically Erasable Programmable Read Only Memory
- CD Compact Disc
- DVD Digital Versatile Disc
- Mass storage media device or any other form of suitable storage media.
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Abstract
Description
Claims (26)
- 一种光伏系统的母线电压控制方法,所述光伏系统包括DC/DC变换器和DC/AC变换器,其中,所述DC/DC变换器、所述DC/AC变换器以及储能电池通过母线连接,所述DC/DC变换器与光伏直流源连接且对来自所述光伏直流源的输入功率进行最大功率跟踪MPPT,与所述DC/AC变换器连接的负载具有负载功率,所述储能电池具有充电最大功率和放电最大功率,其特征在于,所述方法包括:根据光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在不相同不连续的多个电压区间,其中,所述不相同不连续的多个电压区间对应所述逆变器的不同工作状态。
- 根据权利要求1所述的方法,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率大于所述充电最大功率时,控制所述母线电压工作在第一电压区间,其中,所述第一电压区间对应BST侧母线电压参考值,其中,当所述逆变器的工作状态在与所述BST侧母线电压参考值对应的状态时,所述储能电池处于充电状态且所述储能电池的充电功率达到所述充电最大功率,所述光伏直流源的光伏输出功率小于所述光伏最大功率,其中,所述光伏直流源的光伏输出功率等于所述负载功率和所述充电最大功率之和。
- 根据权利要求1所述的方法,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率小于所述充电最大功率时,控制所述母线电压工作在第二电压区间,其中,所述第二电压区间对应储能电池充电母线电压参考值,其中,当所述逆变器的工作状态在与所述储能电池充电母线电压参考值对应的状态时,所述储能电池处于充电状态且所述储能电池的充电功率小于所述充电最大功率,所述光伏直流源提供的光伏输出功率达到所述光伏最大功率,其中,所述储能电池的充电功率等于所述光伏最大功率减去所述负载功率。
- 根据权利要求1所述的方法,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率小于所述放电最大功率时,控制所述母线电压工作在在第三电压区间,其中,所述第三电压区间对应INV侧母线电压参考值,其中,当所述逆变器的工作状态在与所述INV侧母线电压参考值对应的状态时,所述储能电池处于放电状态且所述储能电池的放电功率达到所述放电最大功率,所述光伏直流源提供的光伏输出功率达到所述光伏最大功率,所述负载从交流电网获得补偿功率,所述补偿功率等于所述负载功率减去所述光伏最大功率再加上所述放电最大功率。
- 根据权利要求1所述的方法,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率大于所述放电最大功率时,控制所述母线电压工作在在第四电压区间,其中,所述第四电压区间对应储能电池放电母线电压参考值,其中,当所述逆变器的工作状态在与所述储能电池放电母线电压参考值对应的状态时,所述储能电池处于放电状态且所述储能电池的放电功率大于所述放电最大功率,所述光伏直流源提供的光伏输出功率达到所述光伏最大功率,所述储能电池的放电功率等于所述光伏最大功率减去所述负载功率。
- 根据权利要求1所述的方法,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率大于所述充电最大功率时,控制所述母线电压工作在第一电压区间,其中,所述第一电压区间对应BST侧母线电压参考值,当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率小于所述充电最大功率时,控制所述母线电压工作在第二电压区间,其中,所述第二电压区间对应储能电池充电母线电压参考值,当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率小于所述放电最大功率时,控制所述母线电压工作在在第三电压区间,其中,所述第三电压区间对应INV侧母线电压参考值,当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率大于所述放电最大功率时,控制所述母线电压工作在在第四电压区间,其中,所述第四电压区间对应储能电池放电母线电压参考值,其中,所述BST侧母线电压参考值大于所述储能电池充电母线电压参考值,所述储能电池充电母线电压参考值大于所述储能电池放电母线电压参考值,所述储能电池放电母线电压参考值大于所述INV侧母线电压参考值。
- 根据权利要求6所述的方法,其特征在于,所述方法还包括:根据所述逆变器的母线电压采样值和所述BST侧母线电压参考值生成BST侧母线电压环路控制指令,用于控制所述逆变器的输出功率以使得所述母线电压稳定在所述BST侧母线电压参考值;根据所述母线电压采样值和所述INV侧母线电压参考值生成INV侧母线电压环路控制指令,用于控制所述逆变器的输出功率以使得所述母线电压稳定在所述INV侧母线电压参考值;根据所述母线电压采样值和所述储能电池充电母线电压参考值生成储能电池充电母线电压环路控制指令,用于控制所述储能电池的充电功率以使得所述母线电压稳定在所述储能电池充电母线电压参考值;根据所述母线电压采样值和所述储能电池放电母线电压参考值生成储能电池放电母线电压环路控制指令,用于控制所述储能电池的放电功率以使得所述母线电压稳定在所述储能电池放电母线电压参考值。
- 根据权利要求7所述的方法,其特征在于,所述BST侧母线电压环路控制指令,所述INV侧母线电压环路控制指令,所述储能电池充电母线电压环路控制指令以及所述储能电池放电母线电压环路控制指令均采用PI控制器。
- 根据权利要求1所述的方法,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率大于所述放电最大功率时,或者,当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率小于所述充电最大功率时,控制所述母线电压工作在第五电压区间,其中,所述第五电压区间对应储能电池充放电母线电压参考值,其中,当所述逆变器的工作状态在与所述储能电池充放电母线电压参考值对应的状态时,所述光伏直流源提供的光伏输出功率达到所述光伏最大功率,所述光伏最大功率减去所述负载功率小于所述充电最大功率并且大于所述放电最大功率。
- 根据权利要求1所述的方法,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率大于所述充电最大功率时,控制所述母线电压工作在第一电压区间,其中,所述第一电压区间对应BST侧母线电压参考值,当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率小于所述放电最大功率时,控制所述母线电压工作在在第三电压区间,其中,所述第三电压区间对应INV侧母线电压参考值,当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率大于所述放电最大功率时,或者,当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率小于所述充电最大功率时,控制所述母线电压工作在第五电压区间,其中,所述第五电压区间对应储能电池充放电母线电压参考值,其中,所述BST侧母线电压参考值大于所述储能电池充放电母线电压参考值,所述储能电池充放电母线电压参考值大于所述INV侧母线电压参考值。
- 根据权利要求10所述的方法,其特征在于,所述方法还包括:根据所述逆变器的母线电压采样值和BST侧母线电压参考值生成BST侧母线电压环路控制指令,用于控制所述逆变器的输出功率以使得所述母线电压稳定在所述BST侧母线电压参考值;根据所述母线电压采样值和INV侧母线电压参考值生成INV侧母线电压环路控制指令,用于控制所述逆变器的输出功率以使得所述母线电压稳定在所述INV侧母线电压参考值;根据所述母线电压采样值和储能电池充放电母线电压参考值生成储能电池充放电母线电压环路控制指令,用于控制所述储能电池的充放电功率以使得所述母线电压稳定在所述储能电池充放电母线电压参考值。
- 根据权利要求11所述的方法,其特征在于,所述BST侧母线电压环路控制指令,所述INV侧母线电压环路控制指令和所述储能电池充放电母线电压环路控制指令均采用PI控制器。
- 根据权利要求1-12中任一项所述的方法,其特征在于,所述充电最大功率和所述放电最大功率预先设定。
- 一种光伏系统,其特征在于,所述光伏系统包括:DC/DC变换器;DC/AC变换器,其中,所述DC/DC变换器、所述DC/AC变换器以及储能电池通过母线连接,所述DC/DC变换器与光伏直流源连接且对来自所述光伏直流源的输入功率进行最大功率跟踪MPPT,与所述DC/AC变换器连接的负载具有负载功率,所述储能电池具有充电最大功率和放电最大功率;和母线电压控制器,其中,所述母线电压控制器用于:根据光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在不相同不连续的多个电压区间,其中,所述不相同不连续的多个电压区间对应所述逆变器的不同工作状态。
- 根据权利要求14所述的光伏系统,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率大于所述充电最大功率时,控制所述母线电压工作在第一电压区间,其中,所述第一电压区间对应BST侧母线电压参考值,其中,当所述逆变器的工作状态在与所述BST侧母线电压参考值对应的状态时,所述储能电池处于充电状态且所述储能电池的充电功率达到所述充电最大功率,所述光伏直流源的光伏输出功率小于所述光伏最大功率,其中,所述光伏直流源的光伏输出功率等于所述负载功率和所述充电最大功率之和。
- 根据权利要求14所述的光伏系统,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率小于所述充电最大功率时,控制所述母线电压工作在第二电压区间,其中,所述第二电压区间对应储能电池充电母线电压参考值,其中,当所述逆变器的工作状态在与所述储能电池充电母线电压参考值对应的状态时,所述储能电池处于充电状态且所述储能电池的充电功率小于所述充电最大功率,所述光伏直流源提供的光伏输出功率达到所述光伏最大功率,其中,所述储能电池的充电功率等于所述光伏最大功率减去所述负载功率。
- 根据权利要求14所述的光伏系统,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率小于所述放电最大功率时,控制所述母线电压工作在在第三电压区间,其中,所述第三电压区间对应INV侧母线电压参考值,其中,当所述逆变器的工作状态在与所述INV侧母线电压参考值对应的状态时,所述储能电池处于放电状态且所述储能电池的放电功率达到所述放电最大功率,所述光伏直流源提供的光伏输出功率达到所述光伏最大功率,所述负载从交流电网获得补偿功率,所述补偿功率等于所述负载功率减去所述光伏最大功率再加上所述放电最大功率。
- 根据权利要求14所述的光伏系统,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率大于所述放电最大功率时,控制所述母线电压工作在在第四电压区间,其中,所述第四电压区间对应储能电池放电母线电压参考值,其中,当所述逆变器的工作状态在与所述储能电池放电母线电压参考值对应的状态时,所述储能电池处于放电状态且所述储能电池的放电功率大于所述放电最大功率,所述光伏 直流源提供的光伏输出功率达到所述光伏最大功率,所述储能电池的放电功率等于所述光伏最大功率减去所述负载功率。
- 根据权利要求14所述的光伏系统,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率大于所述充电最大功率时,控制所述母线电压工作在第一电压区间,其中,所述第一电压区间对应BST侧母线电压参考值,当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率小于所述充电最大功率时,控制所述母线电压工作在第二电压区间,其中,所述第二电压区间对应储能电池充电母线电压参考值,当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率小于所述放电最大功率时,控制所述母线电压工作在在第三电压区间,其中,所述第三电压区间对应INV侧母线电压参考值,当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率大于所述放电最大功率时,控制所述母线电压工作在在第四电压区间,其中,所述第四电压区间对应储能电池放电母线电压参考值,其中,所述BST侧母线电压参考值大于所述储能电池充电母线电压参考值,所述储能电池充电母线电压参考值大于所述储能电池放电母线电压参考值,所述储能电池放电母线电压参考值大于所述INV侧母线电压参考值。
- 根据权利要求19所述的光伏系统,其特征在于,所述母线电压控制器还用于:根据所述逆变器的母线电压采样值和所述BST侧母线电压参考值生成BST侧母线电压环路控制指令,用于控制所述逆变器的输出功率以使得所述母线电压稳定在所述BST侧母线电压参考值;根据所述母线电压采样值和所述INV侧母线电压参考值生成INV侧母线电压环路控制指令,用于控制所述逆变器的输出功率以使得所述母线电压稳定在所述INV侧母线电压参考值;根据所述母线电压采样值和所述储能电池充电母线电压参考值生成储能电池充电母线电压环路控制指令,用于控制所述储能电池的充电功率以使得所述母线电压稳定在所述储能电池充电母线电压参考值;根据所述母线电压采样值和所述储能电池放电母线电压参考值生成储能电池放电母线电压环路控制指令,用于控制所述储能电池的放电功率以使得所述母线电压稳定在所述储能电池放电母线电压参考值。
- 根据权利要求20所述的光伏系统,其特征在于,所述BST侧母线电压环路控制指令,所述INV侧母线电压环路控制指令,所述储能电池充电母线电压环路控制指令以及所述储能电池放电母线电压环路控制指令均采用PI控制器。
- 根据权利要求14所述的光伏系统,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率大于所述放电最大功率时,或者,当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率小于所述充电最大功率时,控制所述母线电压工作在第五电压区间,其中,所述第五电压区间对应储能电池充放电母线电压参考值,其中,当所述逆变器的工作状态在与所述储能电池充放电母线电压参考值对应的状态时,所述光伏直流源提供的光伏输出功率达到所述光伏最大功率,所述光伏最大功率减去所述负载功率小于所述充电最大功率并且大于所述放电最大功率。
- 根据权利要求14所述的光伏系统,其特征在于,根据所述光伏最大功率和所述负载功率之间比较的不同结果以及所述充电最大功率和所述放电最大功率,控制所述母线电压在所述不相同不连续的多个电压区间,包括:当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率大于所述充电最大功率时,控制所述母线电压工作在第一电压区间,其中,所述第一电压区间对应BST侧母线电压参考值,当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率小于所述放电最大功率时,控制所述母线电压工作在在第三电压区间,其中,所述第三电压区间对应INV侧母线电压参考值,当所述光伏最大功率小于所述负载功率且所述光伏最大功率减去所述负载功率大于所述放电最大功率时,或者,当所述光伏最大功率大于所述负载功率且所述光伏最大功率减去所述负载功率小于所述充电最大功率时,控制所述母线电压工作在第五电压区间,其中,所述第五电压区间对应储能电池充放电母线电压参考值,其中,所述BST侧母线电压参考值大于所述储能电池充放电母线电压参考值,所述储能电池充放电母线电压参考值大于所述INV侧母线电压参考值。
- 根据权利要求23所述的光伏系统,其特征在于,所述母线电压控制器还用于:根据所述逆变器的母线电压采样值和BST侧母线电压参考值生成BST侧母线电压环路控制指令,用于控制所述逆变器的输出功率以使得所述母线电压稳定在所述BST侧母线电压参考值;根据所述母线电压采样值和INV侧母线电压参考值生成INV侧母线电压环路控制指令,用于控制所述逆变器的输出功率以使得所述母线电压稳定在所述INV侧母线电压参考值;根据所述母线电压采样值和储能电池充放电母线电压参考值生成储能电池充放电母线电压环路控制指令,用于控制所述储能电池的充放电功率以使得所述母线电压稳定在所述储能电池充放电母线电压参考值。
- 根据权利要求24所述的光伏系统,其特征在于,所述BST侧母线电压环路控制指令,所述INV侧母线电压环路控制指令和所述储能电池充放电母线电压环路控制指令均采用PI控制器。
- 根据权利要求14-25任一项所述的光伏系统,其特征在于,所述充电最大功率和所述放电最大功率预先设定。
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103390900A (zh) * | 2013-07-22 | 2013-11-13 | 上海电力学院 | 一种分布式光伏储能系统及能量管理方法 |
US20170018933A1 (en) * | 2013-12-30 | 2017-01-19 | King Fahd University Of Petroleum And Minerals | Parking lot shade for generating electricity having a photovoltaic system that tracks a maximum power point |
CN109617041A (zh) * | 2019-02-21 | 2019-04-12 | 西南交通大学 | 一种光伏储能系统的能量管理与控制装置 |
CN110661299A (zh) * | 2019-11-07 | 2020-01-07 | 科华恒盛股份有限公司 | 一种光伏系统的功率控制方法及应用该方法的光伏系统 |
CN111293717A (zh) * | 2020-02-24 | 2020-06-16 | 阳光电源股份有限公司 | 一种光储直流耦合系统的控制方法及系统 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5744307B2 (ja) * | 2012-02-13 | 2015-07-08 | 三菱電機株式会社 | 電力変換装置 |
WO2016132586A1 (ja) * | 2015-02-17 | 2016-08-25 | 三菱電機株式会社 | 電力変換システム |
CN111130430B (zh) * | 2020-01-15 | 2021-05-04 | 北京林业大学 | 一种光储发电单元协调控制的方法 |
-
2020
- 2020-10-29 CN CN202080031294.8A patent/CN114698407A/zh active Pending
- 2020-10-29 KR KR1020237016266A patent/KR20230085195A/ko unknown
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-
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103390900A (zh) * | 2013-07-22 | 2013-11-13 | 上海电力学院 | 一种分布式光伏储能系统及能量管理方法 |
US20170018933A1 (en) * | 2013-12-30 | 2017-01-19 | King Fahd University Of Petroleum And Minerals | Parking lot shade for generating electricity having a photovoltaic system that tracks a maximum power point |
CN109617041A (zh) * | 2019-02-21 | 2019-04-12 | 西南交通大学 | 一种光伏储能系统的能量管理与控制装置 |
CN110661299A (zh) * | 2019-11-07 | 2020-01-07 | 科华恒盛股份有限公司 | 一种光伏系统的功率控制方法及应用该方法的光伏系统 |
CN111293717A (zh) * | 2020-02-24 | 2020-06-16 | 阳光电源股份有限公司 | 一种光储直流耦合系统的控制方法及系统 |
Non-Patent Citations (2)
Title |
---|
"Dissertation for the Master Degree in Engineering Harbin Institute of Technology", 15 February 2017, HARBIN INSTITUTE OF TECHNOLOGY, CN, article YANG XU: "RESEARCH ON HARDWARE-DECOUPLING AND CONTROL METHOD OF THREE-PORT DC/DC CONVERTER FOR PV-STORAGE GENERATION SYSTEM", pages: 1 - 69, XP055927171 * |
See also references of EP4216394A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116418040A (zh) * | 2023-04-12 | 2023-07-11 | 上海正泰电源系统有限公司 | 一种基于母线电压分层控制能量流动的方法 |
CN116565964A (zh) * | 2023-07-12 | 2023-08-08 | 西安奇点能源股份有限公司 | 一种户用光储系统全工况下直流母线控制系统 |
CN116565964B (zh) * | 2023-07-12 | 2024-01-09 | 西安奇点能源股份有限公司 | 一种户用光储系统全工况下直流母线控制系统 |
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JP2023549695A (ja) | 2023-11-29 |
EP4216394A1 (en) | 2023-07-26 |
AU2020475318A1 (en) | 2023-05-11 |
CN114698407A (zh) | 2022-07-01 |
AU2020475318B2 (en) | 2024-02-15 |
US20230261510A1 (en) | 2023-08-17 |
KR20230085195A (ko) | 2023-06-13 |
EP4216394A4 (en) | 2023-11-29 |
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