Non-isolated energy storage inverter and grid load power measurement method

Abstract

The present invention relates to a non-isolated energy storage inverter and a grid load power measurement method. The non-isolated energy storage inverter comprises a bidirectional inverter circuit, a first control circuit, a voltage acquisition device, a second control circuit, and an electrical isolation device. The bidirectional inverter circuit and the voltage acquisition device are separately connected to the first control circuit. The voltage acquisition device is used for acquiring voltage characteristic data of a load voltage. The electrical isolation device is used for electrically isolating the first control circuit from the second control circuit. The second control circuit is in communication with the first control circuit. The non-isolated energy storage inverter further comprises a current acquisition device for acquiring a load current of a power grid. The second control circuit further acquires the voltage characteristic data from the first control circuit, and acquires a load power on the basis of the voltage characteristic data and the load current. The invention solves the problem in the related art of complex circuitry and high costs resulting from the need for additional circuitry when load current is measured by a current transformer and sent to an inverter to calculate grid load power.

Description

Non-isolated energy storage inverter and grid load power detection method Technical Field

[0001] This specification relates to the field of power grid energy storage technology, and in particular to a non-isolated energy storage inverter and a power grid load power detection method. Background Art

[0002] Energy storage inverters typically need to detect the grid's load power to implement their own power control. Previously, this was done with an electric meter. Installing the meter required rewiring existing wiring within the distribution box, which was time-consuming and labor-intensive, and the meter itself was expensive. However, using a current transformer to detect the load current and then feed the load current signal into the energy storage inverter for grid load power calculation greatly facilitates installation and is now widely used in energy storage systems.

[0003] The problem with using a current transformer to detect current signals and feeding them into the energy storage inverter for power calculation is that if the current signal is fed directly into a control circuit that is not electrically isolated from the main power circuit for power calculation, the current signal detected by the current transformer needs to be electrically isolated within the energy storage inverter, which means that a more expensive second control circuit needs to be added.

[0004] If the current signal is sent to the control circuit in the energy storage inverter, which is already electrically isolated from the main power circuit, for power calculation, the load voltage is also required for power calculation. However, the electrically isolated control circuit generally does not collect the load voltage. In this case, if power calculation is to be performed, an additional load voltage sampling circuit is required. The load voltage sampling circuit also requires an isolated sampling circuit, which complicates the circuit design and increases the design cost.

[0005] Summary of the Invention

[0006] The embodiments of the present invention provide a non-isolated energy storage inverter and a grid load power detection method, which at least solve the problem in related technologies that when detecting the load current through a current transformer and sending it to the inverter to calculate the grid load power, additional circuits are required, resulting in complex circuits and high costs.

[0007] An embodiment of the present invention provides a non-isolated energy storage inverter, comprising a bidirectional inverter circuit, a first control circuit, a voltage acquisition device, a second control circuit, and an electrical isolation device, wherein the bidirectional inverter circuit and the voltage acquisition device are respectively electrically connected to the first control circuit, and the first control circuit is communicatively connected to the second control circuit; wherein the first control circuit is configured to control the output power of the bidirectional inverter circuit in a non-isolated driving manner; the voltage acquisition device is configured to acquire voltage characteristic data of a load voltage; the electrical isolation device is configured to electrically isolate the first control circuit from the second control circuit; the second control circuit is configured to interact with user commands and communicate with the first control circuit; wherein the non-isolated energy storage inverter further comprises: a current acquisition device, the current acquisition device being electrically connected to the second control circuit and configured to acquire a load current of a power grid; the second control circuit is further configured to obtain voltage characteristic data characterizing the load voltage from the first control circuit, obtain the load power of the power grid based on the voltage characteristic data and the load current, and send the load power to the first control circuit, so that the first control circuit controls the output power of the bidirectional inverter circuit based on the load power.

[0008] The beneficial effects of the embodiments of the present invention include: a first control circuit of a non-isolated energy storage inverter receives voltage characteristic data of a grid load collected by a voltage acquisition device and simulates the load voltage. A second control circuit receives the load current collected by a current acquisition device and the simulated load voltage to calculate the load power of the grid load. This allows for grid load power detection without requiring additional circuitry, thus avoiding increased circuit complexity and cost.

[0009] As an optional embodiment, the electrical isolation device includes a digital isolator.

[0010] The first control circuit and the second control circuit are isolated by the digital isolator, so that the first control circuit and the second control circuit are effectively electrically isolated, and the circuit structure is simple.

[0011] As an optional embodiment, the digital isolator is also used to provide a communication channel for data communication between the first control circuit and the second control circuit; the communication channel includes: a first communication channel and a second communication channel; the first communication channel is used to transmit zero-crossing information in real time; the second communication channel is used to transmit amplitude information, wherein the delay of the second communication channel does not exceed a preset delay time.

[0012] A digital isolator provides a communication channel between the first and second control circuits, including a first real-time communication channel and a second real-time communication channel. Amplitude information transmission requires less latency and can be transmitted via the second communication channel. Zero-crossing information requires more latency and can be transmitted via the first real-time communication channel, ensuring efficient transmission of all voltage signature data.

[0013] As an optional embodiment, the current collection device includes a current transformer, and the current transformer is connected in series with the grid load.

[0014] The load current is collected by the current transformer and directly transmitted to the second control circuit, so that the second control circuit can effectively obtain the load current.

[0015] As an optional embodiment, the second control circuit includes: a load voltage simulation unit and a load power calculation unit, wherein the load voltage simulation unit is used to simulate the load voltage of the power grid according to the voltage characteristic data; and the load power calculation unit is used to calculate the load power according to the load voltage and the load current.

[0016] The load voltage simulation unit determines the period and phase based on zero-crossing information. Combined with the amplitude information, it generates a simulated voltage that matches the load voltage's amplitude and phase. This simulated acquisition of the load voltage avoids the need for new circuitry. The load power calculation unit calculates the load power based on the load voltage and load current.

[0017] As an optional embodiment, the voltage acquisition device includes: a voltage amplitude sampling circuit and a voltage zero-crossing capture circuit; the voltage amplitude sampling circuit is used to collect the amplitude information of the load voltage, the voltage amplitude sampling circuit is connected to the first control circuit, and transmits the collected amplitude information to the first control circuit; the voltage zero-crossing capture circuit is used to collect the zero-crossing point information of the load voltage, the voltage zero-crossing capture circuit is connected to the first control circuit, and transmits the collected zero-crossing point information to the first control circuit; wherein, the voltage characteristic data includes the amplitude information zero-crossing point information used to determine the period and phase of the voltage signal of the grid load.

[0018] The voltage amplitude sampling circuit collects the amplitude information of the load voltage, and the voltage zero-crossing capture circuit collects the zero-crossing point information of the load voltage, thereby effectively collecting the voltage characteristic data of the load voltage.

[0019] An embodiment of the present invention provides a grid load power detection method, which is applied to a non-isolated energy storage inverter. The method includes: obtaining the load current of the grid through a current acquisition device, and collecting voltage characteristic data of the load of the grid through a voltage acquisition device, wherein the current acquisition device is connected to the second control circuit of the non-isolated energy storage inverter, and the voltage acquisition device is connected to the first control circuit of the non-isolated energy storage inverter, an electrical isolation device is provided between the first control circuit and the second control circuit, and the first control circuit and the second control circuit communicate with each other; based on the second control circuit, simulating and generating a load voltage according to the voltage characteristic data; and in the second control circuit, calculating the load power of the grid load according to the load current and the load voltage.

[0020] The beneficial effects of the embodiments of the present invention include: The first control circuit of the non-isolated energy storage inverter receives voltage characteristic data of the grid load collected by the voltage acquisition device and simulates the load voltage. The second control circuit receives the load current collected by the current acquisition device and the simulated load voltage to calculate the load power of the grid load. This allows for grid load power detection without requiring additional circuitry, thus avoiding increased circuit complexity and cost.

[0021] As an optional embodiment, the load current of the power grid is obtained through a current acquisition device, and the voltage characteristic data of the load of the power grid is obtained through a voltage acquisition device, including: obtaining the load current of the power grid collected by a current transformer through the second control circuit, wherein the current acquisition device is a current transformer, and the current transformer is connected in series with the power grid load; and obtaining the voltage characteristic data of the load of the power grid collected by the voltage acquisition device through the first control circuit.

[0022] The load current collected by the current transformer is obtained through the second control circuit, eliminating the need to add an additional second control circuit to the current transformer to perform load calculations within the electrically isolated first control circuit. The voltage characteristic data collected by the voltage acquisition device is obtained using the second control circuit, eliminating the need to add a separate voltage sampling circuit and a second control circuit for the voltage sampling circuit.

[0023] As an optional embodiment, the voltage characteristic data includes amplitude information and zero-crossing point information. Obtaining the voltage characteristic data of the load of the power grid collected by the voltage acquisition device through the first control circuit includes: obtaining the amplitude information collected by the voltage amplitude sampling circuit through the first control circuit; obtaining the zero-crossing point information collected by the voltage zero-crossing capture circuit through the first control circuit; wherein the voltage acquisition device includes the voltage amplitude sampling circuit and the voltage zero-crossing capture circuit.

[0024] The voltage acquisition device collects amplitude information from the voltage amplitude sampling circuit, and the voltage acquisition device collects zero-crossing information from the voltage zero-crossing capture circuit. Based on this amplitude and zero-crossing information, the load voltage can be simulated within the allowable error range of the actual voltage signal, serving as the basis for subsequent load power calculations.

[0025] As an optional embodiment, after obtaining the voltage characteristic data of the load of the power grid collected by the voltage acquisition device through the first control circuit, the method also includes: controlling the first control circuit to send the zero-crossing information to the second control circuit in real time through the first communication channel; controlling the first control circuit to send the amplitude information to the second control circuit through the second communication channel, wherein the delay of the second communication channel does not exceed the preset delay time.

[0026] The transmission of amplitude information has low delay requirements and can be transmitted using the second communication channel. The zero-crossing information has high delay requirements and can be transmitted using the first communication channel of real-time communication to ensure that all data of the voltage characteristic data are effectively transmitted.

[0027] As an optional embodiment, simulating and generating an analog voltage signal based on the voltage characteristic data includes: determining the period and phase of the voltage signal based on the zero-crossing point information; and generating the analog voltage signal of a preset signal type based on the period and phase, and the amplitude information.

[0028] The period and phase can be determined based on the zero-crossing point information. Combined with the amplitude information, an analog voltage consistent with the amplitude and phase of the load voltage can be generated to ensure that the phase and amplitude of the analog voltage are consistent with the load voltage, so as to ensure that the simulated voltage value is the same as the actual voltage value, thereby ensuring the accuracy of the load voltage acquisition and the accuracy of the load power calculation.

[0029] As an optional embodiment, after calculating the load power of the grid load based on the load current and the load voltage, the method further includes: sending the load power to a first control circuit; controlling the first control circuit to perform power control on the non-isolated energy storage inverter based on the load power after receiving the load power; wherein the maximum total delay for data collection, calculation and transmission of the load power is two mains cycles, which is less than the minimum delay required for the power control response speed of the inverter.

[0030] After determining the load power, the non-isolated energy storage inverter is controlled based on the load power, allowing the energy storage power to be adjusted according to the grid load. By limiting the delay in load power calculation, the delay requirements for power control of the non-isolated energy storage inverter are met, enabling timely and effective power control of the non-isolated energy storage inverter.

[0031] An embodiment of the present invention provides an electronic device, comprising: a processor, and a memory storing a program, wherein the program comprises instructions, and when the instructions are executed by the processor, the processor executes any one of the above-mentioned grid load power detection methods.

[0032] An embodiment of the present invention provides a non-transitory machine-readable medium storing computer instructions, wherein the computer instructions are used to enable the computer to execute any one of the above-mentioned power grid load power detection methods.

[0033] The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below so that other features, objects, and advantages of the invention are more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be derived from these drawings without inventive effort.

[0035] FIG1 is a schematic diagram of a non-isolated energy storage inverter according to an embodiment of the present invention.

[0036] FIG2 is a flow chart of a method for detecting power of a power grid load according to an embodiment of the present invention.

[0037] FIG3 is a schematic diagram of an inverter power control architecture according to an embodiment of the present invention.

[0038] FIG4 is a schematic structural diagram of the electronic device of this embodiment. DETAILED DESCRIPTION

[0039] The following describes embodiments of the present invention in more detail with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0040] Energy storage devices are an important component of the power system. They can effectively manage demand, reduce peaks and valleys, and smooth loads. They can more effectively utilize power equipment, reduce power supply costs, and promote the application of renewable energy. They are also a way to improve the operational stability of the power system and adjust the frequency.

[0041] The energy storage inverter serves as the interface between the grid and the energy storage device. It controls the inverter's power based on the grid load power, thereby controlling the energy storage power. In related technologies, when calculating load power in an energy storage inverter, a current transformer is used to detect the load current. This load current signal is then fed into the energy storage inverter to calculate the grid load power.

[0042] However, the problem encountered when using a current transformer to detect the current signal and send it to the energy storage inverter for power calculation is that if the current signal is directly sent to a control circuit that is not electrically isolated from the main power circuit for power calculation, the current signal detected by the current transformer sent in will need to be electrically isolated within the energy storage inverter, which means that a more expensive electrical isolation circuit will need to be added.

[0043] If the current signal is sent to the control circuit within the energy storage inverter, which is already electrically isolated from the main power circuit, for power calculation, the load voltage is also required for power calculation. However, electrical isolation circuits generally do not have the function of collecting load voltage. Therefore, if power calculation is to be performed, an additional load voltage sampling circuit is required. This also requires the addition of an isolated sampling circuit, complicating the circuit design and increasing the design cost.

[0044] To address the problem in related technologies of detecting load current through a current transformer and sending it to an energy storage inverter to calculate grid load power, which requires additional circuitry, resulting in complex circuits and high costs, an embodiment of the present invention provides a non-isolated energy storage inverter and a grid load power detection method thereof.

[0045] The electrically isolated second control circuit in a non-isolated energy storage inverter simulates the load voltage by receiving grid load voltage signature data collected by the non-isolated first control circuit. It then calculates the grid load power based on the received load current and the simulated load voltage. This eliminates the need for additional circuitry, reducing circuit complexity and cost.

[0046] FIG1 is a schematic diagram of a non-isolated energy storage inverter according to an embodiment of the present invention. As shown in FIG1 , an embodiment of the present invention provides a non-isolated energy storage inverter, including a bidirectional inverter circuit 11, a first control circuit 12, a voltage acquisition device 13, a second control circuit 14, and an electrical isolation device 15.

[0047] The bidirectional inverter circuit 11 and the voltage acquisition device 13 are respectively electrically connected to the first control circuit 12, and the first control circuit 12 is communicatively connected to the second control circuit 14. The first control circuit 12 is used to control the output power of the bidirectional inverter circuit 11 in a non-isolated drive mode; the voltage acquisition device 13 is used to collect voltage characteristic data of the load voltage; the electrical isolation device 15 is used to electrically isolate the first control circuit 12 and the second control circuit 14; the second control circuit 14 is used for user command interaction and communication with the first control circuit 12;

[0048] Among them, the non-isolated energy storage inverter also includes: a current acquisition device 16, which is electrically connected to the second control circuit 14 and is used to collect the load current of the power grid; the second control circuit 14 is also used to obtain voltage characteristic data used to characterize the load voltage from the first control circuit 12, obtain the load power of the power grid based on the voltage characteristic data and the load current, and send the load power to the first control circuit 12, so that the first control circuit 12 controls the output power of the bidirectional inverter circuit 11 based on the load power.

[0049] In the non-isolated energy storage inverter provided in the embodiments of the present invention, the first control circuit 12 of the non-isolated energy storage inverter receives voltage characteristic data of the grid load collected by the voltage acquisition device 13 to simulate the load voltage. The second control circuit 14 receives the load current collected by the current acquisition device 16 and the simulated load voltage to calculate the load power of the grid load. This allows for grid load power detection without requiring additional circuitry, thus avoiding increased circuit complexity and cost.

[0050] The non-isolated energy storage inverter is positioned between the grid and the energy storage device, and controls the energy storage power of the energy storage device through power control of the bidirectional inverter circuit 11. During power control of the bidirectional inverter circuit 11 based on grid load power, the non-isolated energy storage inverter internally calculates the load power.

[0051] The non-isolated energy storage inverter includes two control circuits: the first control circuit 12 and the second control circuit 14. Theoretically, both circuits can be used to execute load power calculations. However, the first control circuit 12 is connected to the bidirectional inverter circuit 11 and the voltage acquisition device 13, and is actually indirectly connected to the grid and the load. This means that the first control circuit 12 is not electrically isolated.

[0052] If the load power calculation is performed by the first control circuit 12, separate electrical isolation devices need to be provided for the current acquisition device 16 and the voltage acquisition device 13. Therefore, this embodiment selects the second control circuit 14 to perform the load power calculation via the electrical isolation device 15.

[0053] The second control circuit 14 is directly connected to the current acquisition device 16, eliminating the need for electrical isolation of the current acquisition device 16. The load voltage is collected by the first control circuit 12 and then transmitted to the second control circuit 14 for power calculation. This eliminates the need for additional voltage sampling and isolation circuits, avoiding the need for new circuitry and reducing the cost of load power detection.

[0054] Since the electrical isolation device 15 between the second control circuit 14 and the first control circuit 12 is generally unable to directly transmit the voltage signal of the load voltage, the first control circuit 12 is required to collect voltage characteristic data and transmit the voltage characteristic data to the second control circuit 14. The second control circuit 14 then simulates the voltage signal of the load voltage based on the voltage characteristic data and calculates the load power in combination with the load current.

[0055] It should be noted that the bidirectional inverter circuit 11 may be a circuit used in related technologies, and this embodiment does not limit its specific structure. The purpose of the bidirectional inverter circuit 11 is to provide a circuit inversion function for the non-isolated energy storage inverter.

[0056] After the second control circuit 14 calculates the load power, it can also send the load power to the first control circuit 12. The first control circuit 12 controls the output power of the bidirectional inverter circuit 11 according to the power control strategy and the load power, thereby realizing power control of the non-isolated energy storage inverter.

[0057] As an optional embodiment, the electrical isolation device 15 includes a digital isolator.

[0058] The first control circuit 12 and the second control circuit 14 are isolated by a digital isolator, so that the first control circuit 12 and the second control circuit 14 are effectively electrically isolated from each other, and the circuit structure is simple.

[0059] Using a digital isolator as the electrical isolation device 15 can simply and effectively electrically isolate the first control circuit 12 from the second control circuit 14. Furthermore, the digital isolator can provide a communication channel between the first control circuit 12 and the second control circuit 14, enabling efficient communication and transmission of the aforementioned voltage characteristic data. This eliminates the need for a separate communication channel, simplifying the circuit structure.

[0060] As an optional embodiment, the digital isolator is also used to provide a communication channel for data communication between the first control circuit 12 and the second control circuit 14; the communication channel includes: a first communication channel and a second communication channel; the first communication channel is used to transmit zero-crossing information in real time; the second communication channel is used to transmit amplitude information, wherein the delay of the second communication channel does not exceed the preset delay time.

[0061] A digital isolator provides a communication channel between the first control circuit 12 and the second control circuit 14, including a first communication channel for real-time communication and a second communication channel. Amplitude information transmission has low latency requirements and can be transmitted using the second communication channel. Zero-crossing information has high latency requirements and can be transmitted using the first communication channel for real-time communication, thereby ensuring efficient transmission of various voltage characteristic data.

[0062] Considering that voltage signature data includes multiple data items, such as amplitude and zero-crossing information, which have different latency requirements, different communication methods can be used. Using different communication methods for different transmission latency requirements can more efficiently utilize communication resources and avoid wasting them.

[0063] Specifically, if the delay requirement for amplitude information is relatively low, a second communication channel that does not exceed a preset delay time can be used for transmission, such as conventional communication methods such as CAN (Controller Area Network), SPI (Serial Peripheral Interface), or SCI (Serial Communication Interface). If the delay requirement for zero-crossing information is relatively high, a first communication channel for real-time communication can be used for transmission, such as a communication method for input / output (IO) level signals.

[0064] It should be noted that the first communication channel and the second communication channel are both communication channels that can be provided by the digital isolator, which avoids the need for dedicated communication channels, thus reducing burden on the system and lowering the complexity of the system.

[0065] As an optional embodiment, the current collection device 16 includes a current transformer, which is connected in series with the grid load.

[0066] The load current is collected through the current transformer and the collected load current is directly transmitted to the second control circuit 14, so that the second control circuit 14 can effectively obtain the load current.

[0067] When collecting the load current of the grid load, the current transformer can be connected in series with the grid load to collect the load current and transmit the load current to the first control circuit 12 in the form of a current signal for subsequent calculation of the load power.

[0068] As an optional embodiment, the second control circuit 14 includes: a load voltage simulation unit and a load power calculation unit, wherein the load voltage simulation unit is used to simulate the load voltage of the power grid according to voltage characteristic data; the load power calculation unit is used to calculate the load power according to the load voltage and load current.

[0069] The load voltage simulation unit determines the period and phase based on zero-crossing information. Combined with the amplitude information, it generates an analog voltage signal that matches the load voltage's amplitude and phase. This analog acquisition of the load voltage avoids the need for new circuitry. The load power calculation unit calculates the load power based on the load voltage and load current.

[0070] The period and phase of the voltage signal are determined based on the zero-crossing point information in the voltage characteristic data. Based on the period, phase and amplitude information in the voltage characteristic data, an analog voltage signal of a preset signal type is generated to ensure that the phase and amplitude of the analog voltage signal are consistent with the voltage signal, so as to ensure that the determined voltage value is the same as the actual voltage value, thereby ensuring the accuracy of the load power.

[0071] The load power can be calculated by multiplying the load voltage and the load current.

[0072] As an optional embodiment, the voltage acquisition device 13 includes: a voltage amplitude sampling circuit and a voltage zero-crossing capture circuit. The voltage amplitude sampling circuit is used to acquire the amplitude information of the load voltage, and the voltage amplitude sampling circuit is connected to the first control circuit 12 and transmits the acquired amplitude information to the first control circuit 12; the voltage zero-crossing capture circuit is used to acquire the zero-crossing point information of the load voltage, and the voltage zero-crossing capture circuit is connected to the first control circuit 12 and transmits the acquired zero-crossing point information to the first control circuit 12. The voltage characteristic data, including the amplitude information and the zero-crossing point information, is used to determine the period and phase of the voltage signal of the grid load.

[0073] The voltage amplitude sampling circuit collects the amplitude information of the load voltage, and the voltage zero-crossing capture circuit collects the zero-crossing point information of the load voltage, thereby effectively collecting the voltage characteristic data of the load voltage.

[0074] It should be noted that the above-mentioned voltage amplitude sampling circuit and voltage zero-crossing capture circuit can be circuits used in related technologies. This embodiment does not limit their specific structures. Their purpose is to obtain the amplitude information and zero-crossing point information of the load voltage.

[0075] As an optional embodiment, the first control circuit 12 includes a first controller, and the second control circuit 14 includes a second controller.

[0076] The first control circuit 12 collects voltage characteristic data through the first controller and transmits it to the second controller of the second control circuit 14. The second controller receives the load current, simulates the load voltage, calculates the load power, and then transmits it to the first controller. The first controller is also used to control the power of the inverter according to the load power.

[0077] The first control circuit 12 may include a first controller, which may be a microcontroller unit (MCU), for example. The second control circuit 14 may include a second controller, which may be a digital signal processing chip (DSP), for example.

[0078] The current acquisition device 16 can be connected to the first controller to obtain the load current. The first controller is connected to the second controller via a digital isolator. On the one hand, it can receive the voltage characteristic data collected by the second controller, and on the other hand, it can transmit the calculated load power to the second controller. The second controller is connected to the voltage acquisition device 13.

[0079] FIG2 is a flow chart of a method for detecting power of a power grid load according to an embodiment of the present invention. As shown in FIG2 , the method for detecting power of a power grid load provided by an embodiment of the present invention is applied to a non-isolated energy storage inverter. The method includes:

[0080] Step S201: Obtaining the load current of the power grid through a current acquisition device, and acquiring voltage characteristic data of the load of the power grid through a voltage acquisition device, wherein the current acquisition device is connected to the second control circuit of the non-isolated energy storage inverter, and the voltage acquisition device is connected to the first control circuit of the non-isolated energy storage inverter, an electrical isolation device is provided between the first control circuit and the second control circuit, and the first control circuit and the second control circuit communicate with each other;

[0081] Step S202, simulating and generating a load voltage based on the voltage characteristic data based on the second control circuit;

[0082] Step S203: In the second control circuit, the load power of the grid load is calculated according to the load current and the load voltage.

[0083] This embodiment provides a method for detecting grid load power. A first control circuit of a non-isolated energy storage inverter receives grid load voltage characteristic data collected by a voltage acquisition device and simulates the load voltage. A second control circuit receives load current collected by a current acquisition device and the simulated load voltage to calculate the grid load power. This method eliminates the need for additional circuitry, thus reducing circuit complexity and cost.

[0084] The non-isolated energy storage inverter is installed between the power grid and the energy storage device. The power control of the non-isolated energy storage inverter enables the energy storage device's energy storage power control. During the power control process based on the grid load power, the non-isolated energy storage inverter needs to internally calculate the load power.

[0085] Specifically, a current acquisition device is used to collect the load current of the grid load and transmit it to the electrically isolated second control circuit of the non-isolated energy storage inverter. The second control circuit can determine the load current of the grid according to the load current.

[0086] For the load voltage, the first control circuit (not electrically isolated) collects voltage characteristic data of the load voltage through a voltage acquisition device, and then transmits the voltage characteristic data to the second control circuit. The second control circuit simulates and generates the load voltage based on the voltage characteristic data and calculates the load power based on the load current.

[0087] In this embodiment, the first control circuit of a non-isolated energy storage inverter collects voltage characteristic data of the load voltage to simulate the load voltage. The simulated load voltage, combined with the load current, can be used to calculate the load power. This enables power detection of the grid load without requiring additional circuitry, thus avoiding increased circuit complexity and cost.

[0088] While the first control circuit and the second control circuit are electrically isolated from each other, a communication channel is provided. The first control circuit uses the communication channel to send voltage characteristic data to the second control circuit. The second control circuit simulates and generates the load voltage based on the voltage characteristic data, thereby determining the load voltage.

[0089] After the second control circuit calculates the load power, it can transmit the load power to the first control circuit through the communication channel, and the first control circuit controls the power of the bidirectional inverter circuit according to the set control strategy based on the load power.

[0090] As an optional embodiment, the load current of the power grid is obtained through a current acquisition device, and the voltage characteristic data of the load of the power grid is collected through a voltage acquisition device, including: obtaining the load current of the power grid collected by a current transformer through a second control circuit, wherein the current acquisition device is a current transformer, and the current transformer is connected in series with the power grid load; obtaining the voltage characteristic data of the load of the power grid collected by the voltage acquisition device through the first control circuit.

[0091] The load current collected by the current transformer is obtained through the second control circuit, eliminating the need to add an additional second control circuit to the current transformer to perform load calculations within the electrically isolated first control circuit. The voltage characteristic data collected by the voltage acquisition device is obtained using the second control circuit, eliminating the need to add a separate voltage sampling circuit and a second control circuit for the voltage sampling circuit.

[0092] The above-mentioned current transformer is arranged outside the inverter and connected to the second control circuit of the non-isolated energy storage inverter. Specifically, when collecting the grid load current, the current transformer can be connected in series with the grid load to collect the current signal of the grid load and transmit the current signal to the second control circuit. The second control circuit can determine the load current based on the current signal.

[0093] Specifically, the current transformer collects the load current signal and transmits the analog signal obtained by reducing the current signal to the second control circuit.

[0094] The first control circuit is located within the non-isolated energy storage inverter, electrically isolated and independent of the second control circuit, and communicates with the second control circuit via a communication channel. After the first control circuit acquires the load's voltage signature data via a voltage acquisition device, it transmits this data to the second control circuit via an existing communication channel. The second control circuit generates an analog voltage signal based on the voltage signature data to determine the grid load's voltage value.

[0095] As an optional embodiment, the voltage characteristic data includes amplitude information and zero-crossing point information. The voltage characteristic data of the load of the power grid collected by the voltage acquisition device is obtained through the first control circuit, including: obtaining the amplitude information collected by the voltage amplitude sampling circuit through the first control circuit; obtaining the zero-crossing point information collected by the voltage zero-crossing capture circuit through the first control circuit; wherein the voltage acquisition device includes a voltage amplitude sampling circuit and a voltage zero-crossing capture circuit.

[0096] The voltage acquisition device collects amplitude information from the voltage amplitude sampling circuit, and the voltage acquisition device collects zero-crossing information from the voltage zero-crossing capture circuit. Based on this amplitude and zero-crossing information, the load voltage can be simulated within the tolerance range of the actual load voltage, serving as the basis for subsequent load power calculations.

[0097] The first control circuit is equipped with a voltage acquisition device comprising a voltage amplitude sampling circuit and a voltage zero-crossing capture circuit. The voltage amplitude sampling circuit acquires load voltage amplitude information, while the voltage zero-crossing capture circuit acquires load voltage zero-crossing information. This zero-crossing information can be used to determine the period and phase of the voltage signal. Combined with the amplitude information, an analog voltage signal can be generated, ensuring that the error between the analog voltage signal and the actual load voltage signal is within an acceptable range.

[0098] The second control circuit receives the amplitude information via a preset communication method. The preset communication method is an existing communication method between the second control circuit and the first control circuit. This can be a communication channel provided by the aforementioned digital isolator. This avoids the problem of setting up a dedicated communication channel for communication, which increases system burden and resource usage.

[0099] As an optional embodiment, after obtaining the voltage characteristic data of the load of the power grid collected by the voltage acquisition device through the first control circuit, the method also includes: controlling the first control circuit to send the zero-crossing information to the second control circuit in real time through the first communication channel; controlling the first control circuit to send the amplitude information to the second control circuit through the second communication channel, wherein the delay of the second communication channel does not exceed the preset delay time.

[0100] The transmission of amplitude information has low delay requirements and can be transmitted using the second communication channel. The zero-crossing information has high delay requirements and can be transmitted using the first communication channel of real-time communication to ensure that all data of the voltage characteristic data are effectively transmitted.

[0101] The voltage characteristic data includes amplitude information and zero-crossing information, which is used to determine the phase and period. The amplitude information is sent to the second control circuit via a second communication channel with a delay not exceeding a preset delay time.

[0102] It should be noted that, due to the low delay requirement for amplitude information, the preset communication mode can be a non-real-time communication mode, which makes more rational use of communication resources. The communication mode of the second communication channel can be a commonly used communication mode, such as CAN, SPI or SCI.

[0103] Zero-crossing information includes phase information, which places high demands on latency. This information can be sent to the second control circuit via the first communication channel, a real-time communication channel, to ensure that the second control circuit can obtain the correct phase information in a timely manner and generate an analog voltage signal. This improves the accuracy of the analog voltage signal and reduces the deviation between the analog voltage signal and the actual voltage signal.

[0104] The real-time communication mode of the first communication channel is to communicate via input / output (IO) level signals. The existing input / output (IO) level signals between the first control circuit and the second control circuit are used for real-time communication, and no special real-time communication channel needs to be created.

[0105] The above-mentioned real-time communication mode can be an input / output level signal. As an existing real-time communication channel, there is no need to create a new implementation channel to transmit zero-crossing information, thus avoiding burden on the system and reducing system complexity.

[0106] As an optional embodiment, simulating and generating a load voltage based on voltage characteristic data includes: determining the period and phase of the voltage signal based on zero-crossing information; and simulating and generating a load voltage signal of a preset signal type based on the period and phase, as well as amplitude information.

[0107] The period and phase can be determined based on the zero-crossing point information. Combined with the amplitude information, an analog voltage consistent with the amplitude and phase of the load voltage can be generated to ensure that the phase and amplitude of the load voltage are consistent with the load voltage, so as to ensure that the simulated load voltage is the same as the actual load voltage, thereby ensuring the accuracy of the load power.

[0108] Based on the amplitude and zero-crossing information, an analog voltage signal is generated. The analog voltage signal is consistent in amplitude and phase with the voltage signal of the grid load. The zero-crossing information can be used to determine the period and phase. Combined with the amplitude information, an analog voltage signal is generated that matches the amplitude and phase of the voltage signal. This analog acquisition of the voltage signal avoids the need for new circuitry.

[0109] Based on the period, phase and amplitude information of the voltage signal, an analog voltage signal of a preset signal type is generated to ensure that the phase and amplitude of the analog voltage signal are consistent with the voltage signal, so as to ensure that the determined voltage value is the same as the actual voltage value, thereby ensuring the accuracy of the load voltage simulation and the accuracy of the load power calculation.

[0110] The above-mentioned preset signal type may be consistent with the actual voltage signal, for example, a sine signal, a cosine signal, etc.

[0111] As an optional embodiment, after calculating the load power of the grid load based on the load current and the load voltage, the method also includes: sending the load power to the first control circuit; controlling the first control circuit to perform power control on the non-isolated energy storage inverter based on the load power after receiving the load power; wherein the maximum total delay for data collection, calculation and transmission of the load power is two mains cycles, which is less than the minimum delay required for the power control response speed of the inverter.

[0112] After determining the load power, the non-isolated energy storage inverter is controlled based on the load power, allowing the energy storage power to be adjusted according to the grid load. By limiting the delay in load power calculation, the delay requirements for power control of the non-isolated energy storage inverter are met, enabling timely and effective power control of the non-isolated energy storage inverter.

[0113] The load power is sent to the first control circuit through a preset communication method. After receiving the load power, the first control circuit performs power control on the non-isolated energy storage inverter according to the load power.

[0114] The grid load power detection method provided in the embodiment of the present invention controls the power of the non-isolated energy storage inverter according to the load power after determining the load power, thereby adjusting the energy storage power according to the grid load.

[0115] The aforementioned load-based power control of the non-isolated energy storage inverter depends on the power control strategies of the grid and the energy storage device. For example, if load power is prioritized and the load power requirement is not met, the non-isolated energy storage inverter can be controlled to output the power required by the load to provide power to the load.

[0116] The circuit outside the non-isolated inverter can also include a power generation device, such as a wind power generator or photovoltaic power generation device. When the power generated by the power generation device cannot meet the load power, the power of the output energy storage device of the non-isolated energy storage inverter can be controlled to meet the load power. If the power generated by the non-isolated energy storage inverter still has a surplus after meeting the load power, the power of the non-isolated energy storage inverter can be controlled to match the power of the input energy storage device.

[0117] That is, the power control of the non-isolated energy storage inverter is performed according to the load power, which changes according to different control strategies and can be specifically set according to the requirements of different control strategies.

[0118] The maximum delay for the second control circuit to receive the voltage characteristic data sent by the first control circuit is one mains power cycle of the power grid; the maximum delay for the second control circuit to send the load power to the first control circuit is one mains power cycle of the power grid; the maximum total delay for the power control of the non-isolated inverter is two mains power cycles, which is less than the minimum delay required for the power control response speed of the non-isolated energy storage inverter.

[0119] By limiting the delay of load power calculation, the delay requirement of inverter power control is met, and timely and effective power control of the inverter is achieved.

[0120] In the aforementioned power grid system, the mains cycle is typically in the millisecond range, for example, 20ms. The minimum delay for power control in the non-isolated energy storage inverter is typically in the second range, for example, 2s. Since zero-crossing information is communicated in real time, its delay is negligible. Therefore, the maximum delay for power control is two mains cycles, far less than the minimum delay required for power control response speed. This ensures that the inverter's power control meets the delay requirements.

[0121] It should be noted that this embodiment also provides an optional implementation method, which is described in detail below.

[0122] FIG3 is a schematic diagram of an inverter power control architecture according to an embodiment of the present invention. As shown in FIG3 , this embodiment provides a power control method for a non-isolated energy storage inverter based on the grid load power detection architecture in FIG3 , including detection of the grid load power. The specific steps are as follows:

[0123] In the first step, the current transformer transmits the detected load current of the grid load to the second control circuit of the non-isolated energy storage inverter;

[0124] In the second step, the first control circuit sends the detected load voltage amplitude information to the second control circuit using a conventional communication method (which can be a communication method such as CAN, SPI or SCI), and transmits the zero-crossing point information of the load voltage changing from negative to positive to the second control circuit using an IO method;

[0125] In the third step, after the second controller MCU in the second control circuit receives the amplitude information and zero-crossing point information of the load voltage, it can generate a sine signal or cosine signal that is consistent with the amplitude and phase of the load voltage. The sine signal or cosine signal is very consistent with the actual load voltage. Although the actual load voltage may have certain harmonic components, the power calculation using the fitted sine signal together with the grid load current detected by the current transformer can fully meet the accuracy requirements of the load power calculation.

[0126] In the fourth step, the grid load power calculated by the second control circuit is transmitted to the first control circuit by means of communication, thereby realizing power control of the energy storage inverter.

[0127] In this embodiment, the first control circuit transmits the grid load voltage amplitude information to the second control circuit with a delay of at most one mains cycle. The delay in sending the zero-crossing point information to the second control circuit via IO is negligible. The delay in sending the power calculated by the second control circuit to the first control circuit is also at most one mains cycle. Therefore, the power calculation method of this embodiment has a delay of at most two mains cycles, which is fully capable of meeting the second-level power control response speed requirement of a fully loaded energy storage system.

[0128] An embodiment of the present invention further provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor. The memory stores a computer program executable by the at least one processor, wherein the computer program, when executed by the at least one processor, causes the electronic device to perform the method of an embodiment of the present invention.

[0129] An embodiment of the present invention further provides a non-transitory machine-readable medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to perform the method of the embodiment of the present invention.

[0130] An embodiment of the present invention further provides a computer program product, including a computer program, wherein when the computer program is executed by a processor of a computer, it is used to enable the computer to perform the method of the embodiment of the present invention.

[0131] Fig. 4 is the structural diagram of the electronic device of the present embodiment. With reference to Fig. 4, the structural block diagram of the electronic device that can be used as the server or client of the embodiment of the present invention will now be described. It is an example of the hardware device that can be applied to various aspects of the present invention. The electronic device is intended to represent various forms of digital electronic computer equipment, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0132] As shown in Figure 4, the electronic device includes a computing unit 401, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 402 or a computer program loaded from a storage unit 408 into a random access memory (RAM) 403. In RAM 403, various programs and data required for the operation of the electronic device can also be stored. The computing unit 401, ROM 402, and RAM 403 are connected to each other via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0133] Multiple components within the electronic device are connected to the I / O interface 405, including an input unit 406, an output unit 407, a storage unit 408, and a communication unit 409. The input unit 406 can be any type of device capable of inputting information into the electronic device. The input unit 406 can receive input numeric or character information and generate key signal inputs related to user settings and / or function control of the electronic device. The output unit 407 can be any type of device capable of presenting information and may include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 408 may include, but is not limited to, a magnetic disk or an optical disk. The communication unit 409 allows the electronic device to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks, and may include, but is not limited to, a modem, a network card, an infrared communication device, a wireless communication transceiver, and / or a chipset, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0134] The computing unit 401 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 401 include, but are not limited to, a CPU, a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units that run machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 401 performs the various methods and processes described above. For example, in some embodiments, the method embodiments of the present invention may be implemented as a computer program, which is tangibly contained in a machine-readable medium, such as a storage unit 408. In some embodiments, part or all of the computer program may be loaded and / or installed on an electronic device via ROM 402 and / or communication unit 409. In some embodiments, the computing unit 401 may be configured to perform the above-described method in any other appropriate manner (e.g., by means of firmware).

[0135] The computer programs for implementing the methods of the embodiments of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer programs are executed by the processor or controller, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer programs may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0136] In the context of an embodiment of the present invention, a machine-readable medium can be a tangible medium that can contain or store a program for use by an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable signal medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared or semiconductor system, device or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium can include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0137] It should be noted that the term "including" and its variations used in the embodiments of the present invention are open-ended, i.e., "including but not limited to." The term "based on" means "based at least in part on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; and the term "some embodiments" means "at least some embodiments." The modifications of "one" and "a plurality of" mentioned in the embodiments of the present invention are illustrative and non-restrictive. Those skilled in the art should understand that, unless the context clearly indicates otherwise, they should be understood as "one or more."

[0138] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the embodiments of the present invention are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0139] The various steps described in the method implementation scheme provided in the embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method implementation scheme may include additional steps and / or omit the steps shown. The scope of protection of the present invention is not limited in this respect.

[0140] The term "embodiment" in this specification refers to specific features, structures, or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments are referenced to each other. In particular, for the embodiments of the device, equipment, and system, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts are referred to the partial description of the method embodiment.

[0141] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of the present invention. Therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A non-isolated energy storage inverter, comprising a bidirectional inverter circuit, a first control circuit, a voltage acquisition device, a second control circuit, and an electrical isolation device, wherein the bidirectional inverter circuit and the voltage acquisition device are electrically connected to the first control circuit respectively, and the first control circuit is communicatively connected to the second control circuit; in, The first control circuit is configured to control the output power of the bidirectional inverter circuit in a non-isolated driving manner; The voltage acquisition device is configured to acquire voltage characteristic data of the load voltage of the power grid; The electrical isolation device is configured to electrically isolate the first control circuit from the second control circuit; The second control circuit is configured to interact with user instructions and communicate with the first control circuit; wherein the non-isolated energy storage inverter further includes: A current collection device, the current collection device is electrically connected to the second control circuit and is configured to collect a load current of the power grid; The second control circuit is also configured to obtain voltage characteristic data for characterizing the load voltage from the first control circuit, obtain the load power of the power grid according to the voltage characteristic data and the load current, and send the load power to the first control circuit so that the first control circuit controls the output power of the bidirectional inverter circuit based on the load power.

2. The non-isolated energy storage inverter according to claim 1, wherein: The electrical isolation device includes a digital isolator.

3. The non-isolated energy storage inverter according to claim 2, wherein: The digital isolator is further configured to provide a communication channel for data communication between the first control circuit and the second control circuit; The communication channel comprises: a first communication channel and a second communication channel; The first communication channel is used to transmit zero-crossing information in real time; the second communication channel is used to transmit amplitude information, wherein the delay of the second communication channel does not exceed a preset delay time.

4. The non-isolated energy storage inverter according to claim 1, wherein: The current collection device comprises a current transformer, and the current transformer is connected in series with the grid load.

5. The non-isolated energy storage inverter according to claim 1, wherein: The second control circuit includes: a load voltage simulation unit and a load power calculation unit, wherein: The load voltage simulation unit is configured to simulate the load voltage of the power grid according to the voltage characteristic data; The load power calculation unit is configured to calculate the load power according to the load voltage and the load current.

6. The non-isolated energy storage inverter according to claim 1, wherein: The voltage acquisition device comprises: a voltage amplitude sampling circuit and a voltage zero-crossing capture circuit; The voltage amplitude sampling circuit is configured to collect amplitude information of the load voltage, and the voltage amplitude sampling circuit is connected to the first control circuit to transmit the collected amplitude information to the first control circuit; The voltage zero-crossing capture circuit is configured to collect zero-crossing point information of the load voltage, and the voltage zero-crossing capture circuit is connected to the first control circuit to transmit the collected zero-crossing point information to the first control circuit; The voltage characteristic data includes zero-crossing point information of the amplitude information, and the zero-crossing point information is set to determine the period and phase of the voltage signal of the power grid load.

7. A method for detecting power of a power grid load, applied to a non-isolated energy storage inverter, the method comprising: The load current of the power grid is acquired through a current acquisition device, and the voltage characteristic data of the load of the power grid is acquired through a voltage acquisition device, wherein the current acquisition device is connected to the second control circuit of the non-isolated energy storage inverter, and the voltage acquisition device is connected to the first control circuit of the non-isolated energy storage inverter, an electrical isolation device is provided between the first control circuit and the second control circuit, and the first control circuit and the second control circuit communicate with each other; Simulating and generating a load voltage based on the voltage characteristic data by the second control circuit; In the second control circuit, the load power of the grid load is calculated according to the load current and the load voltage.

8. The method according to claim 7, wherein: The load current of the power grid is acquired by a current acquisition device, and the voltage characteristic data of the load of the power grid is acquired by a voltage acquisition device, including: Acquiring the load current of the power grid collected by the current transformer through the second control circuit, wherein the current collection device is a current transformer, and the current transformer is connected in series with the power grid load; The voltage characteristic data of the load of the power grid collected by the voltage collection device is obtained through the first control circuit.

9. The method according to claim 8, wherein: The voltage characteristic data includes amplitude information and zero-crossing point information, and the voltage characteristic data of the load of the power grid acquired by the voltage acquisition device is acquired through the first control circuit, including: Acquiring amplitude information collected by the voltage amplitude sampling circuit through the first control circuit; Acquiring zero-crossing point information collected by the voltage zero-crossing capture circuit through the first control circuit; Wherein, the voltage acquisition device includes the voltage amplitude sampling circuit and the voltage zero-crossing capture circuit.

10. The method according to claim 9, wherein: After acquiring the voltage characteristic data of the load of the power grid collected by the voltage collection device through the first control circuit, the method further includes: Controlling the first control circuit to send the zero-crossing point information to the second control circuit in real time through the first communication channel; Control the first control circuit to send the amplitude information to the second control circuit through a second communication channel, wherein a delay of the second communication channel does not exceed a preset delay time.

11. The method according to claim 9, wherein: The method of simulating and generating an analog voltage signal according to the voltage characteristic data includes: Determining the period and phase of the voltage signal according to the zero-crossing point information; The analog voltage signal of a preset signal type is generated according to the period and phase, and the amplitude information.

12. The method according to any one of claims 7 to 11, wherein: After calculating the load power of the grid load according to the load current and the load voltage, the method further includes: sending the load power to a first control circuit; After controlling the first control circuit to receive the load power, the non-isolated energy storage inverter is powered according to the load power; The maximum total delay of the load power data collection, calculation and transmission is two mains cycles, which is less than The inverter's power control response speed requires a minimum delay.

13. An electronic device comprising: A processor, and a memory storing a program, wherein the program includes instructions, and when the instructions are executed by the processor, the processor executes the power grid load power detection method according to any one of claims 7 to 12.

14. A non-transitory machine-readable medium storing computer instructions, wherein: The computer instructions are configured to enable the computer to execute the power grid load power detection method according to any one of claims 7 to 12.

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