Energy storage hybrid network inverter and control method and device thereof

Abstract

The invention relates to the technical field of photovoltaic power generation, in particular to an energy storage hybrid grid inverter and a control method and device thereof. The method comprises the steps that if it is detected that an energy storage hybrid grid inverter is in a grid state, whether photovoltaic power is larger than battery charging power or not is judged; and if the photovoltaic power is smaller than or equal to the battery charging power, controlling the photovoltaic power to only charge the energy storage battery to a preset condition and then stop charging the energy storage battery, and controlling the photovoltaic power and the mains supply to supply power to the load together based on the current photovoltaic power and the load power after charging is stopped. Or controlling the photovoltaic system to carry out grid-connected power generation on excess energy after the load energy is met; and if the photovoltaic power is greater than the battery charging power, controlling the photovoltaic power and the mains supply to supply power to the load together based on the photovoltaic power, the battery charging power and the load power after the photovoltaic power is controlled to meet the battery charging energy, or controlling the photovoltaic power to perform grid-connected power generation on excess energy after the photovoltaic power is controlled to meet the load energy. According to the invention, photovoltaic energy can be utilized to the maximum extent, and the electric quantity of the battery is stored.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to an energy storage hybrid grid inverter and a control method and device thereof. Background Art

[0002] With the continuous growth of photovoltaic installed capacity and the popularization of distributed power generation systems, the market demand for energy storage hybrid inverters continues to increase.

[0003] The energy storage hybrid inverter connects photovoltaic, energy storage battery and mains. The energy storage hybrid inverter can convert photovoltaic energy into a suitable voltage to charge the energy storage battery and power the load, or convert it into AC power to input the grid to achieve grid-connected power generation. The mains can also charge the energy storage battery or power the load through the energy storage hybrid inverter. In the related art, the energy storage hybrid inverter cannot maximize the use of photovoltaic energy while preserving the battery power.

[0004] Therefore, it is necessary to design a control method that can maximize the utilization of photovoltaic energy while preserving battery power for application in energy storage hybrid grid inverters. Summary of the invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide an energy storage hybrid grid inverter and a control method and device thereof, which can maximize the use of photovoltaic energy while preserving battery power.

[0006] The present invention discloses a control method for an energy storage hybrid grid inverter, which is applied to the energy storage hybrid grid inverter, wherein the energy storage hybrid grid inverter is connected to photovoltaic, energy storage battery and mains, and is characterized in that the control method for the energy storage hybrid grid inverter comprises:

[0007] If it is detected that the energy storage hybrid grid inverter is in a grid-connected state, in the first working mode of the energy storage hybrid grid inverter, it is determined whether the photovoltaic power is greater than the battery charging power;

[0008] If the photovoltaic power is less than or equal to the battery charging power, the photovoltaic power is controlled to charge the energy storage battery only to the preset condition and then stop charging the energy storage battery. After stopping charging the energy storage battery, based on the current photovoltaic power and load power, the photovoltaic power and the mains are controlled to supply power to the load together, or the photovoltaic power and the mains are controlled to supply power to the load together and after the load energy is met, the excess energy is connected to the grid for power generation;

[0009] If the photovoltaic power is greater than the battery charging power, the photovoltaic power is controlled to charge the battery, and after the battery charging energy is met, based on the photovoltaic power, battery charging power and load power, the photovoltaic power and the mains power are controlled to supply power to the load together, or the photovoltaic power and the mains power are controlled to supply power to the load together and after the load energy is met, the excess energy is connected to the grid for power generation.

[0010] Optionally, after stopping charging the energy storage battery, based on the current photovoltaic power and the load power, controlling the photovoltaic power and the mains power to power the load together, or controlling the photovoltaic power and the mains power to power the load together and connecting the excess energy to the grid for power generation after the load energy is met, comprises the steps of:

[0011] After stopping charging the energy storage battery, determine whether the photovoltaic power is greater than the load power;

[0012] If the photovoltaic power is less than or equal to the load power, control the photovoltaic power and the mains power to supply power to the load together;

[0013] If the photovoltaic power is greater than the load power, the photovoltaic and mains power are controlled to supply power to the load together, and after the load energy is met, the excess energy is connected to the grid for power generation.

[0014] Optionally, based on photovoltaic power, battery charging power and load power, controlling photovoltaic power and mains power to power the load together, or controlling photovoltaic power and mains power to power the load together and connecting excess energy to the grid for power generation after the load energy is met, comprises the steps of:

[0015] Determine whether the photovoltaic power is greater than the sum of the battery charging power and the load power;

[0016] If the photovoltaic power is less than the sum of the battery charging power and the load power, the photovoltaic power is controlled to supply power to the load only together with the mains power;

[0017] If the photovoltaic power is greater than the sum of the battery charging power and the load power, the photovoltaic and mains power are controlled to supply power to the load together, and after the photovoltaic meets the load energy, the excess energy is connected to the grid for power generation.

[0018] Optionally, the control method further includes:

[0019] If it is detected that the energy storage hybrid grid inverter is in a grid-connected state and a first working mode switching instruction is detected, the energy storage hybrid grid inverter switches to work in the second working mode to determine whether the photovoltaic power is greater than the load power;

[0020] If the photovoltaic power is less than or equal to the load power, the photovoltaic power is controlled to supply power to the load only together with the mains power;

[0021] If the photovoltaic power is greater than the load power, based on the photovoltaic power, load power and battery charging power, the photovoltaic power is controlled to supply power to the load only together with the mains, and after the photovoltaic power meets the load energy, the excess energy is controlled to charge the energy storage battery. Alternatively, after the photovoltaic power meets the load energy and the energy storage battery charging energy, the excess energy is connected to the grid for power generation.

[0022] Optionally, based on photovoltaic power, load power and battery charging power, controlling photovoltaic power to supply power to the load only together with the mains, and controlling the excess energy to charge the energy storage battery after the photovoltaic power meets the load energy, or controlling the photovoltaic power to meet the load energy and the battery charging energy, and then connecting the excess energy to the grid for power generation, including the steps of:

[0023] Determine whether the photovoltaic power is greater than the sum of the battery charging power and the load power;

[0024] If the photovoltaic power is less than the sum of the load power and the battery charging power, the photovoltaic power is controlled to supply power to the load only together with the mains, and after the photovoltaic power meets the load energy, the excess energy is controlled to charge the energy storage battery;

[0025] If the photovoltaic power is greater than the sum of the load power and the battery charging power, the photovoltaic and city power are controlled to power the load, and the photovoltaic is controlled to charge the energy storage battery. After the photovoltaic meets the load energy and the battery charging energy, the excess energy is connected to the grid for power generation.

[0026] Optionally, the control method further includes:

[0027] If it is detected that the energy storage hybrid grid inverter is in a grid-connected state and a second working mode switching instruction is detected, the energy storage hybrid grid inverter switches to work in the third working mode to determine whether the photovoltaic power is greater than the load power;

[0028] If the photovoltaic power is less than the load power, the photovoltaic power is controlled to supply power to the load only together with the mains power;

[0029] If the photovoltaic power is greater than the load power, based on the photovoltaic power, load power and grid-connected power, the photovoltaic power is controlled to supply power to the load only together with the mains. After the photovoltaic power meets the load energy, the excess energy is connected to the grid for power generation. Alternatively, the photovoltaic power is controlled to charge the energy storage battery with the excess energy after meeting the load energy and the grid-connected power generation energy.

[0030] Optionally, based on photovoltaic power, load power and grid-connected power, controlling photovoltaic power to supply power to the load only together with the mains, after photovoltaic power meets the load energy, using the excess energy for grid-connected power generation, or controlling photovoltaic power to charge the energy storage battery with the excess energy after meeting the load energy and the grid-connected power generation energy, comprises the steps of:

[0031] Determine whether the photovoltaic power is greater than the sum of the load power and the power generated and connected to the grid;

[0032] If the photovoltaic power is less than the sum of the load power and the power of the power generation grid, the photovoltaic power is controlled to supply power to the load only together with the mains. After the photovoltaic power meets the load energy, the excess energy is connected to the grid for power generation;

[0033] If the photovoltaic power is greater than the sum of the load power and the power generated and connected to the grid, the photovoltaic and mains power are controlled to supply power to the load, and the photovoltaic is controlled to generate power for grid-connected power. After the photovoltaic meets the load energy and the grid-connected power generation energy, the excess energy is used to charge the energy storage battery.

[0034] Optionally, the control method further includes:

[0035] If it is detected that the energy storage hybrid grid inverter is in a grid-free state, the energy storage hybrid grid inverter switches to operate in the fourth operating mode to determine whether the photovoltaic power is greater than the load power;

[0036] If the photovoltaic power is greater than or equal to the load power, the photovoltaic is controlled to supply power to the load, and after the photovoltaic meets the load energy, the excess energy is used to charge the energy storage battery;

[0037] If the photovoltaic power is less than the load power, the photovoltaic and energy storage batteries are controlled to supply power to the load together.

[0038] The present invention also discloses a control device for an energy storage hybrid grid inverter, comprising the following modules:

[0039] A judgment module is used to detect that the energy storage hybrid grid inverter is in a grid-connected state, and in the first working mode of the energy storage hybrid grid inverter, judge whether the photovoltaic power is greater than the battery charging power;

[0040] The control module is used to control the photovoltaic power to charge the energy storage battery only to a preset condition and then stop charging the energy storage battery if the photovoltaic power is less than or equal to the battery charging power; after stopping charging the energy storage battery, based on the current photovoltaic power and the load power, control the photovoltaic power and the mains power to supply power to the load together, or control the photovoltaic power and the mains power to supply power to the load together and connect the excess energy to the grid for power generation after the load energy is met; if the photovoltaic power is greater than the battery charging power, control the photovoltaic power to charge the battery, and after the battery charging energy is met, based on the photovoltaic power, the battery charging power and the load power, control the photovoltaic power and the mains power to supply power to the load together, or control the photovoltaic power and the mains power to supply power to the load together and connect the excess energy to the grid for power generation after the load energy is met.

[0041] The present invention also discloses an energy storage hybrid grid inverter, comprising a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program and implement the steps of the control method of the energy storage hybrid grid inverter as described above when executing the computer program.

[0042] Compared with the prior art, the control method of the energy storage hybrid grid inverter provided by the embodiment of the present invention has the beneficial effect that: in the case of a power grid, by comparing the photovoltaic power with the battery charging power, when the photovoltaic power is less than or equal to the battery charging power, the photovoltaic is controlled to charge the energy storage battery to a preset condition first, so that the energy storage battery maintains sufficient power, and then based on the current photovoltaic power after stopping charging, the photovoltaic and the mains are controlled to supply power to the load together, or the excess energy is used for grid-connected power generation while supplying power to the load. When the photovoltaic power is greater than the battery charging power, the photovoltaic is controlled to supply power to the load together based on the photovoltaic power, the battery charging power and the load power after satisfying the battery charging energy, or the excess energy is used for grid-connected power generation on the basis of supplying power to the load, so as to maximize the utilization of photovoltaic energy. Even if the energy storage battery is stopped from being charged, the photovoltaic energy will not be wasted. At the same time, sufficient battery reserve energy can be saved as much as possible to prevent use when the mains power is abnormal. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The scheme of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0044] Figure 1 It is a flow chart of a control method of an energy storage hybrid grid inverter provided by an embodiment of the present invention (the energy storage hybrid grid inverter is in a first working mode);

[0045] Figure 2 It is a specific flow chart of the energy storage hybrid grid inverter provided by an embodiment of the present invention in the first working mode;

[0046] Figure 3 It is a flow chart of a control method of an energy storage hybrid grid inverter provided in an embodiment of the present invention (the energy storage hybrid grid inverter is in a second working mode);

[0047] Figure 4 It is a specific flow chart of the energy storage hybrid grid inverter provided by an embodiment of the present invention in the second working mode;

[0048] Figure 5 It is a flow chart of a control method of an energy storage hybrid grid inverter provided by an embodiment of the present invention (the energy storage hybrid grid inverter is in a third working mode);

[0049] Figure 6 It is a specific flow chart of the energy storage hybrid grid inverter provided by an embodiment of the present invention in the third working mode;

[0050] Figure 7 It is a flow chart of a control method of an energy storage hybrid grid inverter provided by an embodiment of the present invention (the energy storage hybrid grid inverter is in a fourth working mode);

[0051] Figure 8 It is a specific flow chart of the energy storage hybrid grid inverter provided by an embodiment of the present invention in the fourth working mode;

[0052] Fig. 9 It is a structural block diagram of a control device for an energy storage hybrid grid inverter provided by an embodiment of the present invention;

[0053] Fig.10 It is a structural block diagram of the energy storage hybrid grid inverter provided by an embodiment of the present invention.

[0054] The reference numerals in the figures are:

[0055] 100. Control device of energy storage hybrid grid inverter; 101. Judgment module; 102. Control module;

[0056] 200. Energy storage hybrid grid inverter; 201. Memory; 202. Processor. DETAILED DESCRIPTION

[0057] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, the preferred embodiments of the present invention are described in detail.

[0058] The embodiment of the present invention provides a control method of an energy storage hybrid grid inverter, which is applied to the energy storage hybrid grid inverter, where the energy storage hybrid grid inverter is connected to photovoltaic, energy storage battery and mains. The control method of the embodiment of the present invention is applied in the scenario where the photovoltaic power is greater than 0, the load power is greater than 0, and the mains voltage is within the normal range.

[0059] like Figure 1 As shown, the control method of the energy storage hybrid grid inverter includes:

[0060] S110, if it is detected that the energy storage hybrid grid inverter is in a grid-connected state, in the first working mode of the energy storage hybrid grid inverter, determining whether the photovoltaic power is greater than the battery charging power;

[0061] S120, if the photovoltaic power is less than or equal to the battery charging power, control the photovoltaic power to charge the energy storage battery only to a preset condition and then stop charging the energy storage battery, and after stopping charging the energy storage battery, control the photovoltaic power and the mains power to supply power to the load together based on the current photovoltaic power and the load power, or control the photovoltaic power and the mains power to supply power to the load together and connect the excess energy to the grid for power generation after the load energy is met;

[0062] S130. If the photovoltaic power is greater than the battery charging power, control the photovoltaic power to charge the battery, and after the battery charging energy is met, control the photovoltaic power and the mains power to supply power to the load together based on the photovoltaic power, the battery charging power and the load power, or control the photovoltaic power and the mains power to supply power to the load together and after the load energy is met, connect the excess energy to the grid for power generation.

[0063] In step S120, when there is a power grid, that is, normal city power, the photovoltaic power is compared with the battery charging power. If the photovoltaic power is less than or equal to the battery charging power, it means that the current photovoltaic energy is small, and the photovoltaic is controlled to charge only the energy storage battery. The photovoltaic energy can be stored in the energy storage battery first, so that the committed battery always keeps sufficient power for emergency use. For example, it can power the load together with the photovoltaic when there is no power grid. After charging the energy storage battery to the preset condition, the charging is stopped. The preset condition can be a condition set by the user, such as the set maximum voltage value, or it can be the full voltage setting value of the energy storage battery itself. After stopping charging the energy storage battery, based on the current photovoltaic power and load power after stopping charging, it is determined whether the photovoltaic has enough energy to power the load and generate electricity on the grid, so that the photovoltaic energy is maximized.

[0064] In step S130, if the photovoltaic power is greater than the battery charging power, it means that the photovoltaic power has a larger energy, and the battery charging is given priority so that the battery can always maintain sufficient power. At the same time, after the battery charging power is met, based on the photovoltaic power, the battery charging power and the load power, the photovoltaic power and the city power are controlled to supply power to the load or further connect to the grid for power generation. That is, when the photovoltaic power has a larger energy, while charging the battery, the photovoltaic power, the battery charging power and the load power are also used to supply power to the load and connect to the grid for power generation. There is no need to wait until the energy storage battery is fully charged before supplying power to the load and connecting to the grid for power generation. This can reduce the waste of excess energy after the photovoltaic power meets the charging energy of the energy storage battery during the battery charging process, so as to maximize the utilization of photovoltaic energy.

[0065] Therefore, the control method of the energy storage hybrid grid inverter in the embodiment of the present invention compares the photovoltaic power with the battery charging power. When the photovoltaic power is less than or equal to the battery charging power, the photovoltaic power is controlled to charge the energy storage battery to a preset condition first, and then the photovoltaic power and the mains are controlled to supply power to the load together based on the current photovoltaic power after stopping charging, or the excess energy is used for grid-connected power generation while supplying power to the load. When the photovoltaic power is greater than the battery charging power, the photovoltaic power is controlled to supply power to the load together based on the photovoltaic power, the battery charging power and the load power after satisfying the battery charging energy, or the excess energy is used for grid-connected power generation on the basis of supplying power to the load. The photovoltaic energy can be maximized. Even if the energy storage battery is stopped from being charged, the photovoltaic energy will not be wasted. At the same time, sufficient battery reserve energy can be saved as much as possible to prevent use when the mains power is abnormal.

[0066] Step S120 controls the photovoltaic power and the mains power to supply power to the load together based on the current photovoltaic power and the load power after stopping charging the energy storage battery, or controls the photovoltaic power and the mains power to supply power to the load together and connects the excess energy to the grid for power generation after the load energy is met, including the steps of:

[0067] After stopping charging the energy storage battery, determine whether the photovoltaic power is greater than the load power;

[0068] If the photovoltaic power is less than or equal to the load power, control the photovoltaic power and the mains power to supply power to the load together;

[0069] If the photovoltaic power is greater than the load power, the photovoltaic and mains power are controlled to supply power to the load together, and after the load energy is met, the excess energy is connected to the grid for power generation.

[0070] If the photovoltaic power is less than or equal to the load power, it means that after the photovoltaic energy storage battery is fully charged, the photovoltaic energy is still small, and it is preferred to power the load together with the mains, which can make full use of the photovoltaic energy, reduce the use of the mains, and reduce dependence on external energy. If the photovoltaic power is greater than the load power, it means that the photovoltaic energy is larger and can be used to power the load together with the mains, and there is a surplus after the load power supply energy is met. By controlling the photovoltaic and the mains to power the load together and connecting the excess energy to the grid for power generation after the load energy is met, that is, the photovoltaic power will also connect the excess energy to the grid for power generation while powering the load, which can reduce the waste of excess energy in the process of powering the load and maximize the use of photovoltaic energy.

[0071] Step S130 controls photovoltaic power and mains power to supply power to the load together, or controls photovoltaic power and mains power to supply power to the load together and connects the excess energy to the grid for power generation after the load energy is met, based on photovoltaic power, battery charging power and load power, including the steps of:

[0072] Determine whether the photovoltaic power is greater than the sum of the battery charging power and the load power;

[0073] If the photovoltaic power is less than the sum of the battery charging power and the load power, the photovoltaic power is controlled to supply power to the load only together with the mains power;

[0074] If the photovoltaic power is greater than the sum of the battery charging power and the load power, the photovoltaic and mains power are controlled to supply power to the load together, and after the photovoltaic meets the load energy, the excess energy is connected to the grid for power generation.

[0075] When the photovoltaic power is greater than the battery charging power, it means that the photovoltaic has a large amount of energy, and the charging of the energy storage battery is prioritized. After the charging energy of the energy storage battery is satisfied, when the photovoltaic power is less than the sum of the battery charging power and the load power, it means that after the photovoltaic meets the charging energy of the energy storage battery, the remaining energy is small. The photovoltaic is controlled to supply power to the load only together with the mains. The remaining energy after the photovoltaic meets the charging energy of the energy storage battery can be used to power the load, and this part of the remaining energy is effectively utilized, maximizing the energy utilization rate of the photovoltaic, while reducing the use of the mains. When the photovoltaic power is greater than the sum of the battery charging power and the load power, it means that after the photovoltaic meets the charging energy of the energy storage battery, the remaining energy is large. The photovoltaic is controlled to supply power to the load together with the mains, and after the photovoltaic meets the load energy, the excess energy is connected to the grid for power generation, which can not only meet the charging of the energy storage battery, but also power the load while the energy storage battery is charging, and can also be connected to the grid for power generation, making full use of the photovoltaic energy of the photovoltaic at any time period and improving the energy utilization rate.

[0076] refer to Figure 2 , FIG. is a schematic diagram of a specific process of the energy storage hybrid grid inverter provided by the present invention in the first working mode. The energy storage hybrid grid inverter works in the first working mode, and its control method includes the following steps:

[0077] S101, determine P pv -P bat Is the value of greater than zero, where P pv is the photovoltaic power, P bat is the charging power of the energy storage battery;

[0078] S102, after the photovoltaic power meets the charging energy of the energy storage battery, the photovoltaic power and the mains power supply together supply power to the load;

[0079] S103, determine P pv -P bat -P load Is the value greater than zero, where P load is the load power;

[0080] S104, after the photovoltaic power generation meets the load energy and the energy storage battery charging energy, the photovoltaic power generation is connected to the grid;

[0081] S105, photovoltaic only charges the energy storage battery;

[0082] S106, determining whether the energy storage battery is fully charged;

[0083] S107, judge P pv -P load Is it greater than or equal to zero?

[0084] S108, after the photovoltaic power generation meets the load energy, it is connected to the grid for power generation;

[0085] S109, photovoltaic power and AC power supply together to supply power to the load.

[0086] In the specific work, firstly execute step S101. When the judgment result is no, execute steps S105 and S106 in sequence. When the judgment result is yes, execute steps S102 and S103 in sequence. In step S103, if the judgment result is yes, execute step S104. If the judgment result is no, execute step S102. In step S106, if the judgment result is yes, continue to execute step S107. If the judgment result is no, return to execute step S105. In step S107, if the judgment result is yes, execute step S108. If the judgment result is no, execute step S109.

[0087] refer to Figure 3 In the embodiment of the present invention, the energy storage hybrid grid inverter also includes a second working mode. In the embodiment of the present invention, the control method of the energy storage hybrid grid inverter also includes:

[0088] S210: If it is detected that the energy storage hybrid grid inverter is in a grid-connected state and a first working mode switching instruction is detected, the energy storage hybrid grid inverter switches to work in the second working mode, and determines whether the photovoltaic power is greater than the load power;

[0089] S220, if the photovoltaic power is less than or equal to the load power, control the photovoltaic power supply to the load only together with the mains power;

[0090] S230: If the photovoltaic power is greater than the load power, based on the photovoltaic power, the load power and the battery charging power, the photovoltaic power is controlled to supply power to the load only together with the mains, and after the photovoltaic power meets the load energy, the excess energy is controlled to charge the energy storage battery. Alternatively, after the photovoltaic power meets the load energy and the energy storage battery charging energy, the excess energy is connected to the grid for power generation.

[0091] In step S210, in a specific implementation scenario, a first working mode switching instruction is detected. Specifically, the energy storage hybrid grid inverter is provided with a first control component corresponding to the first working mode, and the user operates the first control component. The energy storage hybrid grid inverter generates a first working mode switching instruction upon detecting that the user operates the first control component, and the first working mode switching instruction is detected.

[0092] When the photovoltaic power is less than or equal to the load power, it means that the photovoltaic energy is small, and the photovoltaic is controlled to supply power to the load only together with the mains. At this time, the energy storage battery is not used to supply power to the load, so that the energy storage battery maintains its charge. When the photovoltaic power is greater than the load power, it means that the photovoltaic energy is large. By controlling the photovoltaic power, load power and battery charging power, the load, energy storage battery and grid-connected power generation can be reasonably controlled to maximize the use of photovoltaic energy while keeping the battery charged.

[0093] Specifically, in step S230, based on the photovoltaic power, the load power and the battery charging power, the photovoltaic is controlled to supply power to the load only together with the mains, and after the photovoltaic meets the load energy, the excess energy is controlled to charge the energy storage battery, or after the photovoltaic meets the load energy and the battery charging energy, the excess energy is connected to the grid for power generation, specifically including:

[0094] Determine whether the photovoltaic power is greater than the sum of the battery charging power and the load power;

[0095] If the photovoltaic power is less than the sum of the load power and the battery charging power, the photovoltaic power is controlled to supply power to the load only together with the mains, and after the photovoltaic power meets the load energy, the excess energy is controlled to charge the energy storage battery;

[0096] If the photovoltaic power is greater than the sum of the load power and the battery charging power, the photovoltaic and city power are controlled to power the load, and the photovoltaic is controlled to charge the energy storage battery. After the photovoltaic meets the load energy and the battery charging energy, the excess energy is connected to the grid for power generation.

[0097] When the photovoltaic power is greater than the load power, it is determined whether the photovoltaic power is greater than the sum of the battery charging power and the load power, so as to determine whether the photovoltaic power has sufficient energy to meet the load power supply, energy storage battery charging and grid-connected power generation, so as to achieve the reasonable allocation and utilization of photovoltaic energy.

[0098] Specifically, if the photovoltaic power is less than the sum of the load power and the battery charging power, it means that the photovoltaic energy is small. The photovoltaic is controlled to supply power to the load only together with the municipal power supply, and after the photovoltaic meets the load energy, the excess energy is controlled to charge the energy storage battery. In this way, when the photovoltaic meets the load power supply, the surplus energy is stored in the energy storage battery, thereby allowing the energy storage battery to retain power.

[0099] If the photovoltaic power is greater than the sum of the load power and the battery charging power, it means that the photovoltaic energy is large. The photovoltaic and municipal power are controlled to supply power to the load, and the photovoltaic is controlled to charge the energy storage battery. After the photovoltaic meets the load energy and the battery charging energy, the excess energy is connected to the grid for power generation. In this way, the photovoltaic can not only meet the load power supply and energy storage battery charging, replenish the battery power, but also connect the surplus energy to the grid for power generation, making full use of the photovoltaic energy.

[0100] In the second working mode, the energy storage battery never supplies power to the load together with photovoltaic power and city power, so that the energy storage battery maintains its power and supplements part of the energy through photovoltaic power, so that the energy storage battery can store more power.

[0101] refer to Figure 4, FIG. is a schematic diagram of a specific process of the energy storage hybrid grid inverter provided by the present invention in the second working mode. The energy storage hybrid grid inverter works in the second working mode, and its control method includes the following steps:

[0102] S201, determine P pv -P load Is the value of greater than zero, where P pv is the photovoltaic power, P load is the load power;

[0103] S202, the photovoltaic power and the mains power supply the load first, and then after the load energy is met, the excess energy is used to supply power to the energy storage battery;

[0104] S203, determine P pv -P load -P bat Is the value of greater than zero, where P bat is the charging power of the energy storage battery;

[0105] S204, the photovoltaic power generation is connected to the grid after the charging energy and load energy of the energy storage battery are met;

[0106] S205. Photovoltaic power supplies power the load only together with the mains.

[0107] During the specific work, first execute step S201, if the judgment result is no, execute step S205, if the judgment result is yes, execute steps S202 and S203 in sequence, in step S203, if the judgment result is yes, execute step S204, if the judgment result is no, return to execute step S202.

[0108] refer to Figure 5 , the energy storage hybrid grid inverter of the embodiment of the present invention further includes a third working mode. In the embodiment of the present invention, the control method of the energy storage hybrid grid inverter further includes:

[0109] S310: If it is detected that the energy storage hybrid grid inverter is in a grid-connected state and a second working mode switching instruction is detected, the energy storage hybrid grid inverter switches to work in a third working mode, and determines whether the photovoltaic power is greater than the load power;

[0110] S320, if the photovoltaic power is less than the load power, control the photovoltaic power supply to the load only together with the mains power supply;

[0111] S330: If the photovoltaic power is greater than the load power, based on the photovoltaic power, the load power and the power generated and connected to the grid, the photovoltaic power is controlled to supply power to the load only together with the mains. After the photovoltaic power meets the load energy, the excess energy is connected to the grid for power generation. Alternatively, the photovoltaic power is controlled to charge the energy storage battery with the excess energy after meeting the load energy and the grid-connected power generation energy.

[0112] In step S310, in a specific implementation scenario, a second working mode switching instruction is detected. Specifically, the energy storage hybrid grid inverter is provided with a second control component corresponding to the second working mode, and the user operates the second control component. The energy storage hybrid grid inverter generates a second working mode switching instruction upon detecting that the user operates the second control component, and the second working mode switching instruction is detected.

[0113] When the photovoltaic power is less than the load power, the photovoltaic power is controlled to supply power to the load only together with the mains power. The photovoltaic energy and the mains power can be used to ensure the normal power supply of the load first, reducing the use of the mains power. When the photovoltaic power is greater than the load power, based on the photovoltaic power, load power and power generation and grid-connected power, the photovoltaic energy is reasonably allocated for load power supply, grid-connected power generation and charging of the energy storage battery. When the user selects this mode, the power supply of the load and grid-connected power generation can be guaranteed first. At the same time, the energy storage battery is not used to power the load and the power of the energy storage battery is not consumed, so that the energy storage battery maintains power in case of emergency, and the photovoltaic energy is fully utilized during this period.

[0114] In step S330, based on the photovoltaic power, the load power and the power generated and connected to the grid, the photovoltaic power is controlled to supply power to the load only together with the mains, and after the photovoltaic power meets the load energy, the excess energy is connected to the grid for power generation, or the photovoltaic power is controlled to charge the energy storage battery with the excess energy after meeting the load energy and the grid-connected power generation energy, including the steps of:

[0115] Determine whether the photovoltaic power is greater than the sum of the load power and the power generated and connected to the grid;

[0116] If the photovoltaic power is less than the sum of the load power and the power of the power generation grid, the photovoltaic power is controlled to supply power to the load only together with the mains. After the photovoltaic power meets the load energy, the excess energy is connected to the grid for power generation;

[0117] If the photovoltaic power is greater than the sum of the load power and the power generated and connected to the grid, the photovoltaic and mains power are controlled to supply power to the load, and the photovoltaic is controlled to generate power for grid-connected power. After the photovoltaic meets the load energy and the grid-connected power generation energy, the excess energy is used to charge the energy storage battery.

[0118] When the photovoltaic power is greater than the load power, the sum of the load power and the power generation and grid-connected power is further compared with the photovoltaic power, and then the photovoltaic energy is intelligently allocated to maximize the use of photovoltaic energy. Specifically, if the photovoltaic power is less than the sum of the load power and the power generation and grid-connected power, it means that the photovoltaic energy can have a surplus in addition to supplying power to the load, but the surplus is not much. By controlling the photovoltaic power to supply power to the load only together with the city power, the photovoltaic power will be connected to the grid for power generation after the load energy is met, that is, the photovoltaic power is connected to the grid while supplying power to the load, and the excess energy after the photovoltaic power meets the load power supply energy can be effectively utilized. If the photovoltaic power is greater than the sum of the load power and the power generated and connected to the grid, it means that the photovoltaic energy can have a surplus after supplying power to the load, and the surplus is large. By controlling the photovoltaic and the mains to supply power to the load, and controlling the photovoltaic to generate power for grid-connected power, after the photovoltaic meets the load energy and the grid-connected power generation energy, the surplus energy is used to charge the energy storage battery. That is, the photovoltaic gives priority to the load power supply and grid-connected power generation, and the surplus energy is used to charge the energy storage battery, and the surplus energy is utilized. During this period, the energy storage battery is not used to supply power to the load, and the surplus energy is used to charge the energy storage battery to keep the energy storage battery with sufficient power.

[0119] refer to Figure 6 , FIG. is a schematic diagram of a specific process of the energy storage hybrid grid inverter provided by the present invention in the third working mode. The energy storage hybrid grid inverter works in the third working mode, and its control method includes the following steps:

[0120] S301, determine P pv -P load Is the value of greater than zero, where P pv is the photovoltaic power, P load is the load power;

[0121] S302, photovoltaic power and city power first supply power to the load, and then after the load energy is met, the excess energy is connected to the grid for power generation;

[0122] S303, determine P pv -P load -P grid Is the value of greater than zero, where P grid The power for power generation and grid connection;

[0123] S304, after the photovoltaic power generation meets the load energy and grid-connected power generation energy, the energy storage battery is charged;

[0124] S305, photovoltaic power supply only together with the mains power supply to supply power to the load.

[0125] The specific work is to first execute step S301. When the judgment result is no, execute step S305. When the judgment result is yes, execute steps S302 and S303 in sequence. In step S303, when the judgment result is no, return to execute step S302. When the judgment result is yes, execute step S304.

[0126] The above energy storage hybrid inverter includes three working modes. Users can choose different modes. When users need to prioritize the power of the energy storage battery and keep the energy storage battery fully charged, they can choose the first working mode; when users need to prioritize the load consumption and then consider the power of the energy storage battery, they can choose the second working mode; when users need to prioritize grid-connected power generation, they can choose the third working mode. In each mode, the photovoltaic energy can be fully utilized to provide energy for the load, and the energy storage battery is not used to power the load, so that the energy storage battery maintains sufficient energy.

[0127] refer to Figure 7 In an embodiment of the present invention, the control method of the energy storage hybrid grid inverter further includes:

[0128] S410: If it is detected that the energy storage hybrid grid inverter is in a grid-free state, the energy storage hybrid grid inverter switches to operate in the fourth operating mode to determine whether the photovoltaic power is greater than the load power;

[0129] S420, if the photovoltaic power is greater than or equal to the load power, control the photovoltaic power supply to the load, and after the photovoltaic power supply meets the load energy, use the excess energy to charge the energy storage battery;

[0130] S430: If the photovoltaic power is less than the load power, control the photovoltaic and battery to supply power to the load together.

[0131] In the fourth working mode, by judging and comparing the size of photovoltaic power and load power, when the photovoltaic power is less than the load power, the photovoltaic and battery are controlled to supply power to the load together to ensure the normal power supply of the load. When the photovoltaic power is greater than or equal to the load power, the photovoltaic is controlled to supply power to the load, and after the photovoltaic meets the load energy, the excess energy is used to charge the energy storage battery, and the excess energy after the photovoltaic meets the load energy is stored in the energy storage battery, effectively utilizing the photovoltaic energy, while allowing the storage battery to save more power. Therefore, when the energy storage hybrid grid inverter is in a state without grid power, the energy storage hybrid grid inverter can still supply power to the load normally, and the user will not be in a power outage state.

[0132] refer to Figure 8 , FIG. is a schematic diagram of a specific process of the energy storage hybrid grid inverter provided by the present invention in the fourth working mode. The energy storage hybrid grid inverter works in the fourth working mode, and its control method includes the following steps:

[0133] S401, determine P pv-P load Is the value of greater than zero, where P pv is the photovoltaic power, P load is the load power; P pv -P bat >0,P pv -P bat -P load >0,P pv -P load ≥0,P pv -P load >0,P pv -P load -P bat >0

[0134] S402, photovoltaic power and city power supply together to supply power to the load, and then the surplus energy is used to charge the energy storage battery;

[0135] S403, photovoltaic and energy storage batteries together supply power to the load;

[0136] In the specific work, firstly execute step S401, when the judgment result is yes, execute step S402, when the judgment result is no, execute step S403.

[0137] like Fig. 9 As shown, the embodiment of the present invention further provides a control device 100 for an energy storage hybrid grid inverter. The control device 100 for an energy storage hybrid grid inverter includes a judgment module 101 and a control module 102.

[0138] The judgment module 101 is used to detect that the energy storage hybrid grid inverter 200 is in a grid-connected state, and in the first working mode of the energy storage hybrid grid inverter 200, judge whether the photovoltaic power is greater than the battery charging power;

[0139] The control module 102 is used to control the photovoltaic power to charge the energy storage battery only to a preset condition and then stop charging the energy storage battery if the photovoltaic power is less than or equal to the battery charging power, and control the photovoltaic power and the mains power to supply power to the load together based on the current photovoltaic power and the load power after stopping charging the energy storage battery, or control the photovoltaic power and the mains power to supply power to the load together and connect the excess energy to the grid for power generation after the load energy is met; if the photovoltaic power is greater than the battery charging power, control the photovoltaic power to charge the battery, and after the battery charging energy is met, control the photovoltaic power and the mains power to supply power to the load together based on the photovoltaic power, the battery charging power and the load power, or control the photovoltaic power and the mains power to supply power to the load together and connect the excess energy to the grid for power generation after the load energy is met.

[0140] It can be seen from the above description that the control method of the energy storage hybrid grid inverter 200 of the embodiment of the present invention compares the photovoltaic power with the battery charging power. When the photovoltaic power is less than or equal to the battery charging power, the photovoltaic power is controlled to charge the energy storage battery to a preset condition first, and then the photovoltaic power and the mains are controlled to supply power to the load together based on the current photovoltaic power after stopping charging, or the excess energy is used for grid-connected power generation while supplying power to the load. When the photovoltaic power is greater than the battery charging power, the photovoltaic power is controlled to supply power to the load together based on the photovoltaic power, the battery charging power and the load power after satisfying the battery charging energy, or the excess energy is used for grid-connected power generation on the basis of supplying power to the load. The photovoltaic energy can be maximized. Even if the energy storage battery is stopped from being charged, the photovoltaic energy will not be wasted. At the same time, sufficient battery reserve energy can be saved as much as possible to prevent use when the mains power is abnormal.

[0141] The judgment module 101 is also used to judge whether the photovoltaic power is greater than the load power after stopping charging the energy storage battery.

[0142] The control module 102 is also specifically used to control the photovoltaic and mains power to supply power to the load together if the photovoltaic power is less than or equal to the load power after stopping charging the energy storage battery; if the photovoltaic power is greater than the load power, control the photovoltaic and mains power to supply power to the load together and connect the excess energy to the grid for power generation after the load energy is met.

[0143] The judgment module 101 is also used to judge whether the photovoltaic power is greater than the sum of the battery charging power and the load power; if the photovoltaic power is less than the sum of the battery charging power and the load power, the photovoltaic power is controlled to supply power to the load only together with the mains; if the photovoltaic power is greater than the sum of the battery charging power and the load power, the photovoltaic power and the mains are controlled to supply power to the load together, and after the photovoltaic power meets the load energy, the excess energy is connected to the grid for power generation.

[0144] The judgment module 101 is also used to detect that the energy storage hybrid grid inverter 200 is in a grid state and detects a first working mode switching instruction, and the energy storage hybrid grid inverter 200 switches to work in the second working mode, and judges whether the photovoltaic power is greater than the load power. And when the photovoltaic power is greater than the load power, it is used to judge whether the photovoltaic power is greater than the sum of the battery charging power and the load power.

[0145] The control module 102 is also used to control the photovoltaic power to supply power to the load only together with the mains if the photovoltaic power is less than or equal to the load power; if the photovoltaic power is greater than the load power, based on the photovoltaic power, the load power and the battery charging power, control the photovoltaic power to supply power to the load only together with the mains, and after the photovoltaic power meets the load energy, control the excess energy to charge the energy storage battery, or, after the photovoltaic power meets the load energy and the battery charging energy, control the excess energy to be connected to the grid for power generation. Specifically, the control module 102 is also used to control the photovoltaic power to supply power to the load only together with the mains if the photovoltaic power is less than the sum of the load power and the battery charging power, and control the excess energy to charge the energy storage battery after the photovoltaic power meets the load energy; if the photovoltaic power is greater than the sum of the load power and the battery charging power, control the photovoltaic power and the mains to supply power to the load, and control the photovoltaic power to charge the energy storage battery, and after the photovoltaic power meets the load energy and the battery charging energy, control the excess energy to be connected to the grid for power generation.

[0146] The judgment module 101 is also used to detect that the energy storage hybrid grid inverter 200 is in a grid-connected state and detects a second working mode switching instruction, and the energy storage hybrid grid inverter 200 switches to work in the third working mode, and judges whether the photovoltaic power is greater than the load power. And when the photovoltaic power is greater than the load power, judge whether the photovoltaic power is greater than the sum of the load power and the power generation grid power.

[0147] The control module 102 is also used to control the photovoltaic power to supply power to the load only together with the mains if the photovoltaic power is less than the load power; if the photovoltaic power is greater than the load power, based on the photovoltaic power, the load power and the power generation and access to the grid, control the photovoltaic power to supply power to the load only together with the mains, and after the photovoltaic power meets the load energy, the excess energy is connected to the grid for power generation, or control the photovoltaic power to charge the energy storage battery with the excess energy after meeting the load energy and the grid-connected power generation energy. Specifically, the control module 102 is also used to control the photovoltaic power to supply power to the load only together with the mains if the photovoltaic power is less than the sum of the load power and the power generation and access to the grid, and after the photovoltaic power meets the load energy, the excess energy is connected to the grid for power generation; if the photovoltaic power is greater than the sum of the load power and the power generation and access to the grid, control the photovoltaic power and the mains to supply power to the load, and control the photovoltaic power to be connected to the grid for power generation, and after the photovoltaic power meets the load energy and meets the grid-connected power generation energy, the excess energy is used to charge the energy storage battery.

[0148] The judgment module 101 is also used to detect that the energy storage hybrid grid inverter 200 is in a state without a power grid, and the energy storage hybrid grid inverter 200 switches to work in the fourth working mode to judge whether the photovoltaic power is greater than the load power. The control module 102 is also used to control the photovoltaic power to supply power to the load if the photovoltaic power is greater than or equal to the load power, and after the photovoltaic power meets the load energy, the excess energy is used to charge the energy storage battery; if the photovoltaic power is less than the load power, control the photovoltaic power and the energy storage battery to supply power to the load together.

[0149] like Fig.10 As shown, an embodiment of the present invention further provides an energy storage hybrid grid inverter 200. The energy storage hybrid grid inverter 200 includes a memory 201 and a processor 202; the memory 201 is used to store a computer program; the processor 202 is used to execute the computer program, and implement the steps of the control method of the energy storage hybrid grid inverter 200 as described above when executing the computer program. The detailed steps can be found above and will not be repeated here.

[0150] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM) and memory bus dynamic RAM (RDRAM).

[0151] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0152] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the protection scope of the claims attached to the present invention.

Claims

1. A control method for an energy storage hybrid grid inverter, applied to the energy storage hybrid grid inverter, wherein the energy storage hybrid grid inverter is connected to photovoltaic, energy storage battery and mains, characterized in that: The control method of the energy storage hybrid grid inverter includes: If it is detected that the energy storage hybrid grid inverter is in a grid-connected state, in the first working mode of the energy storage hybrid grid inverter, it is determined whether the photovoltaic power is greater than the battery charging power; If the photovoltaic power is less than or equal to the battery charging power, the photovoltaic power is controlled to charge the energy storage battery only to the preset condition and then stop charging the energy storage battery. After stopping charging the energy storage battery, based on the current photovoltaic power and load power, the photovoltaic power and the mains are controlled to supply power to the load together, or the photovoltaic power and the mains are controlled to supply power to the load together and after the load energy is met, the excess energy is connected to the grid for power generation; If the photovoltaic power is greater than the battery charging power, the photovoltaic power is controlled to charge the battery, and after the battery charging energy is met, based on the photovoltaic power, battery charging power and load power, the photovoltaic power and the mains power are controlled to supply power to the load together, or the photovoltaic power and the mains power are controlled to supply power to the load together and after the load energy is met, the excess energy is connected to the grid for power generation.

2. The control method of the energy storage hybrid grid inverter according to claim 1, characterized in that: The method of controlling photovoltaic power and mains power to supply power to the load together based on the current photovoltaic power and load power after stopping charging the energy storage battery, or controlling photovoltaic power and mains power to supply power to the load together and connecting the excess energy to the grid for power generation after the load energy is met, comprises the following steps: After stopping charging the energy storage battery, determine whether the photovoltaic power is greater than the load power; If the photovoltaic power is less than or equal to the load power, control the photovoltaic power and the mains power to supply power to the load together; If the photovoltaic power is greater than the load power, the photovoltaic and mains power are controlled to supply power to the load together, and after the load energy is met, the excess energy is connected to the grid for power generation.

3. The control method of the energy storage hybrid grid inverter according to claim 2 is characterized in that: Based on photovoltaic power, battery charging power and load power, photovoltaic and mains are controlled to supply power to the load together, or photovoltaic and mains are controlled to supply power to the load together and the excess energy is connected to the grid for power generation after the load energy is met, including the steps of: Determine whether the photovoltaic power is greater than the sum of the battery charging power and the load power; If the photovoltaic power is less than the sum of the battery charging power and the load power, the photovoltaic power is controlled to supply power to the load only together with the mains power; If the photovoltaic power is greater than the sum of the battery charging power and the load power, the photovoltaic and mains power are controlled to supply power to the load together, and after the photovoltaic meets the load energy, the excess energy is connected to the grid for power generation.

4. The control method of the energy storage hybrid grid inverter according to claim 1, characterized in that: The control method further comprises: If it is detected that the energy storage hybrid grid inverter is in a grid-connected state and a first working mode switching instruction is detected, the energy storage hybrid grid inverter switches to work in the second working mode to determine whether the photovoltaic power is greater than the load power; If the photovoltaic power is less than or equal to the load power, the photovoltaic power is controlled to supply power to the load only together with the mains power; If the photovoltaic power is greater than the load power, based on the photovoltaic power, load power and battery charging power, the photovoltaic power is controlled to supply power to the load only together with the mains, and after the photovoltaic power meets the load energy, the excess energy is controlled to charge the energy storage battery. Alternatively, after the photovoltaic power meets the load energy and the energy storage battery charging energy, the excess energy is connected to the grid for power generation.

5. The control method of the energy storage hybrid grid inverter according to claim 4, characterized in that: Based on photovoltaic power, load power and battery charging power, photovoltaic power is controlled to supply power to the load only together with the mains, and after photovoltaic power meets the load energy, the excess energy is controlled to charge the energy storage battery, or after photovoltaic power meets the load energy and the battery charging energy, the excess energy is connected to the grid for power generation, including the steps of: Determine whether the photovoltaic power is greater than the sum of the battery charging power and the load power; If the photovoltaic power is less than the sum of the load power and the battery charging power, the photovoltaic power is controlled to supply power to the load only together with the mains, and after the photovoltaic power meets the load energy, the excess energy is controlled to charge the energy storage battery; If the photovoltaic power is greater than the sum of the load power and the battery charging power, the photovoltaic and city power are controlled to power the load, and the photovoltaic is controlled to charge the energy storage battery. After the photovoltaic meets the load energy and the battery charging energy, the excess energy is connected to the grid for power generation.

6. The control method of the energy storage hybrid grid inverter according to claim 1, characterized in that: The control method further comprises: If it is detected that the energy storage hybrid grid inverter is in a grid-connected state and a second working mode switching instruction is detected, the energy storage hybrid grid inverter switches to work in the third working mode to determine whether the photovoltaic power is greater than the load power; If the photovoltaic power is less than the load power, the photovoltaic power is controlled to supply power to the load only together with the mains power; If the photovoltaic power is greater than the load power, based on the photovoltaic power, load power and grid-connected power, the photovoltaic power is controlled to supply power to the load only together with the mains. After the photovoltaic power meets the load energy, the excess energy is connected to the grid for power generation. Alternatively, the photovoltaic power is controlled to charge the energy storage battery with the excess energy after meeting the load energy and the grid-connected power generation energy.

7. The control method of the energy storage hybrid grid inverter according to claim 6, characterized in that: Based on the photovoltaic power, the load power and the power for power generation and access to the grid, the photovoltaic power is controlled to supply power to the load only together with the mains power, and after the photovoltaic power meets the load energy, the surplus energy is connected to the grid for power generation, or the photovoltaic power is controlled to charge the energy storage battery with the surplus energy after meeting the load energy and the grid-connected power generation energy, including the steps of: Determine whether the photovoltaic power is greater than the sum of the load power and the power generated and connected to the grid; If the photovoltaic power is less than the sum of the load power and the power of the power generation grid, the photovoltaic power is controlled to supply power to the load only together with the mains. After the photovoltaic power meets the load energy, the excess energy is connected to the grid for power generation; If the photovoltaic power is greater than the sum of the load power and the power generated and connected to the grid, the photovoltaic and mains power are controlled to supply power to the load, and the photovoltaic is controlled to generate power for grid-connected power. After the photovoltaic meets the load energy and the grid-connected power generation energy, the excess energy is used to charge the energy storage battery.

8. The control method of the energy storage hybrid grid inverter according to any one of claims 1 to 7, characterized in that: The control method further comprises: If it is detected that the energy storage hybrid grid inverter is in a grid-free state, the energy storage hybrid grid inverter switches to operate in the fourth operating mode to determine whether the photovoltaic power is greater than the load power; If the photovoltaic power is greater than or equal to the load power, the photovoltaic is controlled to supply power to the load, and after the photovoltaic meets the load energy, the excess energy is used to charge the energy storage battery; If the photovoltaic power is less than the load power, the photovoltaic and energy storage batteries are controlled to supply power to the load together.

9. A control device for an energy storage hybrid grid inverter, characterized in that: Includes the following modules: A judgment module, used to detect that the energy storage hybrid grid inverter is in a grid-connected state, and in the first working mode of the energy storage hybrid grid inverter, judge whether the photovoltaic power is greater than the battery charging power; The control module is used to control the photovoltaic power to charge the energy storage battery only to a preset condition and then stop charging the energy storage battery if the photovoltaic power is less than or equal to the battery charging power; after stopping charging the energy storage battery, based on the current photovoltaic power and the load power, control the photovoltaic power and the mains power to supply power to the load together, or control the photovoltaic power and the mains power to supply power to the load together and connect the excess energy to the grid for power generation after the load energy is met; if the photovoltaic power is greater than the battery charging power, control the photovoltaic power to charge the battery, and after the battery charging energy is met, based on the photovoltaic power, the battery charging power and the load power, control the photovoltaic power and the mains power to supply power to the load together, or control the photovoltaic power and the mains power to supply power to the load together and connect the excess energy to the grid for power generation after the load energy is met.

10. An energy storage hybrid grid inverter, characterized in that: It comprises a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program, and implement the steps of the control method of the energy storage hybrid grid inverter as claimed in any one of claims 1 to 8 when executing the computer program.

Images