Industrial and commercial energy storage field measurement and intelligent scheme configuration system

Abstract

The invention discloses an industrial and commercial energy storage field measurement and intelligent scheme configuration system which is characterized in that a data acquisition subsystem and a data analysis and energy storage configuration subsystem are arranged, a voltage isolation sampling module carries out differential sampling on alternating current high voltage output by a secondary side of a transformer, carries out voltage conversion processing and outputs a weak current single-ended signal; similarly, the current isolation sampling module converts differential signals output by the flexible probe into weak current single-end signals, the main control module receives the weak current single-end signals and calculates the electric energy quality and the power quantity of voltage and current, and the main control module stores detection results in the storage module according to the time sequence for the data analysis and energy storage configuration subsystem to read and analyze. An electric energy quality configuration module and an energy storage system configuration module in the data analysis and energy storage configuration subsystem analyze occupation conditions of transformer capacity in different time periods and electric energy quality conditions of voltage and current by analyzing field electric quantity data, and complete automatic regulation and control of energy storage capacity and operation strategies in combination with the total capacity of the transformer; and the income condition, the cost recovery period and the income condition in the whole life cycle are calculated according to the local electric charge rate.

Description

Technical Field

[0001] This invention belongs to the field of energy storage system technology, and in particular relates to an industrial and commercial energy storage field measurement and intelligent solution configuration system. Background Technology

[0002] The development of the renewable energy industry has become an important engine for global economic development. However, as we all know, wind power relies on natural wind power and photovoltaic power relies on sunlight. The characteristics of wind power and sunlight are instability. They are not only seasonal but also vary significantly at different times of the day and have a certain degree of randomness. This brings an unacceptable problem: the output power fluctuates too much. The load on the power grid is also usually highly volatile, such as the long-term fluctuation between winter and summer, and the short-term fluctuation between weekends and holidays and weekdays, and between the working hours and the off-hours of the day. When there is no renewable energy generation equipment with such fluctuating power generation, the public power grid will have a certain number of standby units to keep running in order to cope with the demand fluctuations on the load side. They can adapt to the power fluctuations on the load side by quickly adjusting the output of the units. However, when the proportion of renewable energy on the generation side is large, the volatility of the entire power grid is greatly increased. The existing traditional energy units must not only adjust the demand fluctuations on the load side but also adapt to the unpredictable supply fluctuations of renewable energy. This requires the existing units to expand their standby capacity on a large scale to balance the supply and demand of the entire power system and ensure the stability of the power system without frequency loss and normal voltage.

[0003] This contradicts the original intention of renewable energy in terms of both economics and system stability. Therefore, in the early stages of the explosive growth in renewable energy installations, it was not welcomed by the grid, resulting in large-scale wind and solar curtailment. To address the grid connection problems of renewable energy, energy storage systems emerged, especially electrochemical energy storage systems. With their rapid response and fast charging / discharging speeds, they demonstrated enormous application potential from the outset. After nearly 10 years of industry development, large-scale energy storage systems with direct high-voltage grid connection on the power generation and grid sides have matured. Benefiting from the success of large-scale energy storage, as the power regulation equipment at the very end of power transmission and distribution, since the rapid rise of industrial and commercial energy storage, combined with distributed photovoltaics, renewable energy vehicle charging stations, and high-power uninterrupted production workshops, and supported by local electricity pricing policies, coupled with flexible charging and discharging operation strategies, investors have been able to achieve rapid profitability.

[0004] With the gradual release of domestic battery production capacity, industrial and commercial energy storage will inevitably maintain rapid growth and become an important driver of economic growth. Within the energy storage industry, refined management and control, intelligent strategies, and automated operation and maintenance are all being applied in the field. New software technologies such as virtual power plant algorithms and grid-connected converters are also contributing to the realization of electricity spot market transactions. After several years of development, the installed capacity of industrial and commercial energy storage projects on the user side has doubled year by year, bringing new challenges. The low-voltage electrical equipment at the end of the distribution network is diverse. The low-voltage side of the same transformer may contain large-inertia rotating equipment such as low-power-factor motors, injection-type equipment with large inrush currents, rectifier bridge-type sintering furnaces with high harmonic currents, as well as converter-type equipment such as frequency converters and photovoltaic power generation equipment. Therefore, the capacity configuration of industrial and commercial energy storage presents many challenges. First, the maximum discharge and charging current of the energy storage must be designed based on the transformer capacity and the maximum load. Second, the need to determine whether harmonic mitigation devices are required or to conduct targeted design based on the current and voltage harmonic conditions at the proposed installation point.

[0005] However, since the application of industrial and commercial energy storage is still relatively recent, there are no mature methods for on-site installation and configuration. The main approach is to rely on manual on-site measurement of current during peak and off-peak electricity rates, combined with on-site meter data, to make a rough design. It is difficult to accurately utilize the on-site transformer capacity, and power quality issues have not received sufficient attention. Therefore, it is usually difficult to achieve maximum economic benefits, and overcurrent protection due to power quality issues is prone to occur during operation. Summary of the Invention

[0006] This invention provides an industrial and commercial energy storage field measurement and intelligent solution configuration system. It can monitor the power consumption data of the field load over multiple days, analyze the transformer capacity occupancy at different times, and the power quality of voltage and current. Combined with the total transformer capacity, it can automatically design the energy storage capacity and operation strategy, and then calculate the revenue, cost recovery period and revenue over the entire life cycle based on the local electricity rate. The specific technical solution is as follows.

[0007] This invention provides an industrial and commercial energy storage field measurement and intelligent solution configuration system, including a data acquisition subsystem and a data analysis and energy storage configuration subsystem; The data acquisition subsystem includes a transformer, a main control module, an isolation sampling module, and a load. The primary side of the transformer is used to connect to the three-phase voltage, the secondary side of the transformer is connected to the isolation sampling module and the load, and the main control module is connected to the isolation sampling module. The data analysis and energy storage configuration subsystem includes a power value detection module, a risk recording module, a power quality configuration module, and an energy storage system configuration module. The power value detection module, the risk recording module, and the energy storage system configuration module are all connected to the main control module, and the energy storage system configuration module and the power quality configuration module are all connected to the risk recording module. The isolation sampling module is used to perform voltage conversion processing on the differential voltage output from the secondary side of the transformer to output a weak single-ended signal. The main control module receives the weak single-ended signal, calculates the power quality and power of the voltage and current, and sends it to the power value detection module. The risk recording module receives the detection results of the power quality and power of the voltage and current detected by the power value detection module. The main control module controls the opening and closing of the power quality configuration module and / or the energy storage system configuration module according to the detection results.

[0008] As a preferred embodiment of the above technical solution, the data acquisition subsystem further includes an LDO module and an SMPS module. The main control module, the isolation sampling module, and the SMPS module are all connected to the LDO module, and the isolation sampling module and the load are all connected to the SMPS module. The LDO module is used to provide a stable voltage to the main control module, and the SMPS module is used to power the entire system.

[0009] As a preferred embodiment of the above technical solution, the data acquisition subsystem further includes an interaction module and a storage module. Both the interaction module and the storage module are connected to the main control module. The storage module is used to store the sampling and calculation data of the weak current single-ended signal processed by the main control module. The interaction module is used to display the effective values ​​of voltage and current, harmonic components of voltage and current, or communication status and storage status corresponding to the sampling and calculation data. The interaction module is also used to execute at least one of the following commands: power on, power off, store, or clear.

[0010] As a preferred embodiment of the above technical solution, the isolation sampling module includes multiple voltage sampling isolation channels and multiple current sampling isolation channels. The voltage sampling isolation channel includes a first ADC unit and a first DAC unit. The first ADC unit is used to convert the differential signal into a first high-frequency pulse signal, and the first DAC unit receives the first high-frequency pulse signal and restores it to a first weak single-ended signal. The current sampling isolation channel includes a current probe, a second ADC unit, and a second DAC unit. The current probe is used to acquire the current signal corresponding to the differential voltage and send the voltage signal corresponding to the current signal to the second ADC unit. The second ADC unit is used to convert the voltage signal into a second high-frequency pulse signal. The second DAC unit converts the second high-frequency pulse signal into a second low-voltage single-ended signal. The main control module receives the first low-voltage single-ended signal and the second low-voltage single-ended signal.

[0011] As a preferred embodiment of the above technical solution, both the first weak current single-ended signal and the second weak current single-ended signal are 0~3V voltages, and the current signal is mA-level current.

[0012] As a preferred embodiment of the above technical solution, the main control module includes an RMS_U3 module, an RMS_I3 module, an APT module, an APM module, and an IAP module. The RMS_U3 module is used to calculate the effective value of the three-phase voltage. The effective value of the instantaneous three-phase voltage is calculated by using the root mean square method of the period, and the corresponding expression is: (1) in, , , Representing the instantaneous values ​​of the three-phase voltages, respectively, we obtain... , , Three effective voltage values; The RMS_I3 module is used to calculate the effective value of the three-phase current, which is derived from the instantaneous value of the three-phase current. , , The effective value of the current was calculated. , , ; The APT module is used to calculate apparent power based on the RMS values ​​of three-phase voltage and three-phase current. The corresponding expression is: (2) APM (Active Power Calculation) is used to calculate active power based on the instantaneous values ​​of three-phase voltage and three-phase current. The corresponding expression is: (3) The IAP module is used to calculate reactive power Q, and the corresponding expression is: (4) Where T represents the period and k represents a natural number.

[0013] As a preferred embodiment of the above technical solution, the main control module further includes a Clarke3 module, a Park_P module, a Park_N module, an RMS_2 module, and a THD module. The Clarke3 module is used to perform Clarke transformation on the instantaneous values ​​of the three-phase voltages. , The value is obtained, and the positive sequence harmonic components of the voltage are calculated using the Park_P and RMS_2 modules. ; , The negative sequence harmonic components of the voltage are obtained by calculation using the Park_N module and the RMS_2 module. ,in, , ; The THD module calculates the harmonic components of voltage and current, using formula (5) as the expression for the proportion of the positive sequence nth harmonic component of voltage. The calculation expression is (6): (5) (6).

[0014] As a preferred embodiment of the above technical solution, the power detection module is used to traverse voltage harmonic components and detect the power value of the isolation sampling module. When the voltage harmonic component exceeds the standard, or the voltage drops or is too low, the risk recording module is triggered to record the relevant data of the risk point corresponding to the voltage harmonic component to obtain a data set. The power quality configuration module summarizes and analyzes the relevant data of the risk points to determine whether the power quality of the system is suitable for installing an energy storage system, and provides three levels of risk point warnings from high to low.

[0015] As a preferred embodiment of the above technical solution, when the current harmonic components traversed by the power detection module exceed a preset threshold, the required capacity of the active filter is given according to the excess value corresponding to the current harmonic components.

[0016] As a preferred embodiment of the above technical solution, the energy storage system configuration module calculates the converter capacity and battery capacity configuration based on the difference between the actual power data and the rated capacity of the transformer, as well as the active and reactive power data and the time-of-use electricity price, and calculates the number of daily charging cycles or discharging cycles based on the peak-valley electricity price difference and the battery capacity to determine the daily economic return. The energy storage system configuration module also calculates the overall system cost and the overall system cost recovery period based on the daily economic return.

[0017] This invention provides a field measurement and intelligent configuration system for industrial and commercial energy storage. By setting up a data acquisition subsystem and a data analysis and energy storage configuration subsystem, an isolated sampling module converts the differential voltage output from the secondary side of the transformer into a weak single-ended signal. The main control module receives this weak single-ended signal, calculates the power quality and power of the voltage and current, and sends it to the power value detection module. The risk recording module receives the power quality and power detection results from the power value detection module. Based on the detection results, the main control module controls the opening and closing of the power quality configuration module and / or the energy storage system configuration module. By monitoring the power data of the on-site load over multiple days, the system can analyze the transformer capacity occupancy at different times, as well as the power quality of voltage and current. Combined with the total transformer capacity, it can automatically adjust the energy storage capacity and operating strategy, and then calculate the revenue, cost recovery period, and total life-cycle revenue based on local electricity rates. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A structural block diagram of the industrial and commercial energy storage field measurement and intelligent solution configuration system provided by the present invention; Figure 2 Circuit diagram of the data acquisition subsystem provided by the present invention; Figure 3 A schematic diagram of the power calculation principle provided for this invention; Figure 4 Circuit diagram of the data analysis and energy storage configuration subsystem provided for this invention; Figure 5 This invention provides a functional diagram of voltage and current harmonic analysis and APF configuration. Figure 6 A diagram illustrating the PCS capacity configuration and economic benefit analysis function provided by this invention. Figure 7 The system implementation flowchart provided by the present invention.

[0020] The symbols for the main components are explained below: 100-Transformer; 110-Main control module; 120-Isolation sampling module; 130-Load; 140-Power value detection module; 150-Risk recording module; 160-Power quality configuration module; 170-Energy storage system configuration module; 180-LDO module; 190-SMPS module; 200-Interaction module; 210-Storage module. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] See Figure 1 and Figure 2 This invention provides an industrial and commercial energy storage field measurement and intelligent solution configuration system, including a data acquisition subsystem and a data analysis and energy storage configuration subsystem; The data acquisition subsystem includes a transformer 100, a main control module 110, an isolation sampling module 120, and a load 130. The primary side of the transformer 100 is used to connect to the three-phase voltage, and the secondary side of the transformer 100 is connected to the isolation sampling module 120 and the load 130. The main control module 110 is connected to the isolation sampling module 120. The data analysis and energy storage configuration subsystem includes a power value detection module 140, a risk recording module 150, a power quality configuration module 160, and an energy storage system configuration module 170. The power value detection module 140, the risk recording module 150, and the energy storage system configuration module 170 are all connected to the main control module 110, and the energy storage system configuration module 170 and the power quality configuration module 160 are all connected to the risk recording module 150. The isolation sampling module 120 is used to perform voltage conversion processing on the differential voltage output from the secondary side of the transformer 100 to output a weak single-ended signal. The main control module 110 receives the weak single-ended signal, calculates the power quality and power of the voltage and current, and sends it to the power value detection module 140. The risk recording module 150 receives the detection results of the power quality and power of the voltage and current detected by the power value detection module 140. The main control module 110 controls the opening and closing of the power quality configuration module 160 and / or the energy storage system configuration module 170 according to the detection results.

[0023] In this embodiment, the data acquisition subsystem further includes an LDO module 180 and an SMPS module 190. The main control module 110, the isolation sampling module 120, and the SMPS module 190 are all connected to the LDO module 180, and the isolation sampling module 120 and the load 130 are all connected to the SMPS module 190. The LDO module 180 is used to provide a stable voltage to the main control module 110, and the SMPS module 190 is used to power the entire system. The data acquisition subsystem also includes an interaction module 200 and a storage module 210. The interaction module 200 and the storage module 210 are both connected to the main control module 110. The storage module 210 is used to store the sampling and calculation data of the weak current single-ended signal processed by the main control module 110. The interaction module 200 is used to display the effective values ​​of voltage and current, harmonic components of voltage and current, or communication status and storage status corresponding to the sampling and calculation data. The interaction module 200 is also used to execute at least one of the following commands: power on, power off, store, or clear. The entire system is divided into a data acquisition subsystem and a data analysis and energy storage configuration subsystem. The data acquisition subsystem is responsible for acquiring and storing on-site voltage, current and power data, which is done by an embedded CPU. The data analysis and energy storage configuration subsystem is responsible for reading and analyzing the stored long-term data, which is done by the host computer software on the computer desktop system.

[0024] It should be noted that the isolation sampling module includes multiple voltage sampling isolation channels and multiple current sampling isolation channels. The voltage sampling isolation channel includes a first ADC unit and a first DAC unit. The first ADC unit converts the differential signal into a first high-frequency pulse signal, and the first DAC unit receives the first high-frequency pulse signal and restores it to a first low-voltage single-ended signal. The current sampling isolation channel includes a current probe, a second ADC unit, and a second DAC unit. The current probe collects the current signal corresponding to the differential voltage and sends the voltage signal corresponding to the current signal to the second ADC unit. The second ADC unit converts the voltage signal into a second high-frequency pulse signal, and the second DAC unit converts the second high-frequency pulse signal into a second low-voltage single-ended signal. The main control module receives both the first and second low-voltage single-ended signals. Both the first and second low-voltage single-ended signals are 0~3V voltages, and the current signal is a mA-level current.

[0025] Specifically, such as Figure 2As shown, T1 is the transformer of the field power distribution system. The primary and secondary sides are typically configured as Dy11. LOAD is a simplified equivalent load for the field; this part is existing field equipment and will not be elaborated upon. ISO is the isolation sampling module, where V-CH1~V-CH3 are voltage sampling isolation channels. The input is differential, connected to the three system voltages AN, BN, and CN respectively. Each voltage is divided by the resistor network on the secondary side to obtain a differential voltage. Each channel contains a Σ-Δ module (analog-to-digital converter), whose input is the differential voltage output from the front-end network, responsible for performing the analog-to-digital conversion. The Σ-Δ module (first ADC unit) converts the voltage signal into a first high-frequency pulse signal and sends it to the low-voltage side via high-frequency isolated communication (voltage sampling isolation channel). After receiving the first high-frequency pulse signal, the low-voltage side uses the digital-to-analog converter modules D-S1~D-S3 (first DAC unit) to recover it as a voltage signal and then uses an operational amplifier circuit to recover it as a 0~3V first weak single-ended signal, which are respectively... , , ; FCP_A, FCP_B, and FCP_C are flexible current probes that pass through the three-phase load circuits A, B, and C, outputting mA-level current. I-CH1~I-CH3 are current sampling isolation channels with differential input. The mA-level current (current signal) at the front end is converted into a voltage signal after passing through internal precision resistors. Each voltage signal is then processed by a resistor network to obtain a differential voltage. Each channel contains a Σ-Δ module (second ADC unit), whose input is the differential voltage output from the front-end network. This module is responsible for performing analog-to-digital conversion, converting the voltage signal into a second high-frequency pulse signal. This second high-frequency pulse signal is then sent to the low-voltage side via high-frequency isolated communication (current sampling isolation channel). Upon receiving the second high-frequency pulse signal, the low-voltage side uses digital-to-analog conversion modules D-S4~D-S6 (second DAC unit) to recover it as a voltage signal. This signal is then further processed by an operational amplifier circuit to recover a 0~3V second weak single-ended signal. , , ; , , , , , All of these serve as sampling inputs for the subsequent CPU (main control module); the SMPS (Switch Mode Power Supply) provides the power supply for the entire system, with a 24V input and two 24V outputs, where 24V_1 powers the HMI and 24V_2 powers the LDO. The LDO module (Low-Dropout Regulator) is a non-isolated low-dropout linear regulator module, with a 24V_2 input. Its +12V and -12V outputs power the analog circuits in the ISO module, and its 5V output powers the CPU circuit. The CPU is the main control chip for the entire system, primarily responsible for... , , , , , The system performs sampling and calculations, communicates with the HMI (interactive module), and stores data via USB. The MSD (Mass Storage Device) is a high-capacity data storage module used to store CPU sampling and calculation data. The USB interface supports the 3.0 protocol, with a maximum capacity of 10TB. The HMI (Human Machine Interface) is the human-machine interface that communicates with the CPU via a full-duplex RS422 serial interface. It displays key voltage and current RMS values, harmonic distortion (THD) of voltage and current, and can execute power-on, power-off, save, and clear commands. It also displays communication and storage status.

[0026] It should be understood that this invention, through the establishment of a data acquisition subsystem and a data analysis and energy storage configuration subsystem, uses an isolated sampling module to perform voltage conversion processing on the differential voltage output from the secondary side of the transformer, outputting a weak single-ended signal. The main control module receives the weak single-ended signal, calculates the power quality and power of the voltage and current, and sends it to the power value detection module. The risk recording module receives the detection results of the power quality and power of the voltage and current detected by the power value detection module. The main control module controls the opening and closing of the power quality configuration module and / or the energy storage system configuration module based on the detection results. By monitoring the power data of the on-site load for multiple days, the occupancy of the transformer capacity at different times, as well as the power quality of voltage and current, can be analyzed. Combined with the total transformer capacity, the energy storage capacity and operation strategy can be automatically adjusted. Furthermore, the revenue, cost recovery period, and revenue over the entire life cycle can be calculated based on the local electricity rate.

[0027] Optionally, see Figure 3The main control module includes an RMS_U3 module, an RMS_I3 module, an APT module, an APM module, and an IAP module. The RMS_U3 module is used to calculate the effective value of the three-phase voltage. It calculates the effective value of the instantaneous three-phase voltage using the root mean square method of the period, and the corresponding expression is: (1) in, , , Representing the instantaneous values ​​of the three-phase voltages, respectively, we obtain... , , Three effective voltage values; The RMS_I3 module is used to calculate the effective value of the three-phase current, which is derived from the instantaneous value of the three-phase current. , , The effective value of the current was calculated. , , ; The APT module is used to calculate apparent power based on the RMS values ​​of three-phase voltage and three-phase current. The corresponding expression is: (2) APM (Active Power Calculation) is used to calculate active power based on the instantaneous values ​​of three-phase voltage and three-phase current. The corresponding expression is: (3) The IAP module is used to calculate reactive power Q, and the corresponding expression is: (4) Where T represents the period and k represents a natural number.

[0028] In this embodiment, the main control module further includes a Clarke3 module, a Park_P module, a Park_N module, an RMS_2 module, and a THD module. The Clarke3 module is used to perform Clarke transformation on the instantaneous values ​​of the three-phase voltages. , The value is obtained, and the positive sequence harmonic components of the voltage are calculated using the Park_P and RMS_2 modules. ; , The negative sequence harmonic components of the voltage are obtained by calculation using the Park_N module and the RMS_2 module. ,in, , ; The THD module calculates the harmonic components of voltage and current, using formula (5) as the expression for the proportion of the positive sequence nth harmonic component of voltage. The calculation expression is (6): (5) (6).

[0029] It should be noted that, in addition to acquiring raw electrical quantities such as voltage and current, another important function of the data acquisition subsystem is to calculate the power quality of voltage and current as well as the system power. The CPU's calculation of electrical quantities mainly involves power and harmonics. , , After a 3 / 2 transformation using the Clarke3 module, the result is obtained. , The values ​​of uD and uQ are then used by the positive-sequence Park module Park_P and the RMS_2 module to calculate the positive-sequence harmonic components of the voltage, U_n (n=7,13,19,25,31,37,43,49); the values ​​of uD and uQ are used by the negative-sequence Park module Park_N and the RMS_2 module to calculate the negative-sequence harmonic components of the voltage, U_m (m=5,11,17,23,29,35,41,47); the positive-sequence components of the current, I_n (n=7,13,19,25,31,37,43,49) and I_m (m=5,11,17,23,29,35,41,47), are calculated using the same method as the voltage.

[0030] The power detection module is used to traverse voltage harmonic components and detect the power value of the isolation sampling module. When the voltage harmonic component exceeds the standard, or the voltage drops or is too low, the risk recording module is triggered to record the relevant data of the risk point corresponding to the voltage harmonic component, thus obtaining a data set. The power quality configuration module summarizes and analyzes the relevant data of the risk point to determine whether the power quality of the system meets the requirements for installing an energy storage system, and provides a three-level risk point warning according to the level from high to low. When the current harmonic component traversed by the power detection module exceeds a preset threshold, the required active filter capacity is given according to the excess value corresponding to the current harmonic component. The energy storage system configuration module calculates the converter capacity and battery capacity configuration based on the difference between the actual power data and the rated capacity of the transformer, as well as the active and reactive power data and the time-of-use electricity price. It also calculates the number of daily charging cycles or discharging cycles based on the peak-valley electricity price difference and the battery capacity to determine the daily economic return. The energy storage system configuration module also calculates the cost recovery period of the entire system based on the daily economic return.

[0031] Specifically, such as Figure 4As shown, the main function of the data analysis and energy storage configuration subsystem is to analyze the effective values ​​of voltage and current, harmonics, and power data output by the aforementioned modules, as well as... (Transformer rated capacity) (Data storage time stamp) (Time-of-use electricity price curve); The OVER_CHECK module iterates through the THDu (voltage harmonic component) data and checks each power value. When THDu exceeds the standard, voltage drops, or voltage overvoltage occurs, it triggers the subsequent RISK_RECORD (risk record) module to record the relevant data of this risk point and obtain the data group [RISK_U]; the relevant data group [RISK_C] for the current-related risk points is obtained through the same logic; The E_QUALITY_CONFIG (power quality configuration) module summarizes and analyzes the risk point data to determine whether the power quality of this system is suitable for installing an energy storage system (Suitable), and gives three levels of risk point prompts (Risk_I, Risk_II, Risk_III) from high to low. If the system harmonic current exceeds the standard, the required active power filter capacity (APF_Cap) is given according to the excess value. The ENERGY_STORAGE_CONFIG module calculates the converter capacity (PCS_Cap) and battery capacity (Battery) configuration based on the difference between the actual system power (S) and the transformer rated capacity (Se) (Smargin), as well as the active and reactive power (P, Q) and time-of-use electricity price (e_price). At the same time, it calculates the number of daily charge / discharge cycles based on the peak-valley electricity price difference and battery capacity, thereby calculating the daily economic return (Daily_Return), and calculates the cost recovery period (CRP) of the entire system based on the total system cost (system_cost).

[0032] The following explanation will be based on data from a specific field in a certain province, combined with host computer software: See Figure 5 , Figure 5 The image shows the host computer interface 1, whose main function is to... Figure 4 The voltage and current harmonics are analyzed, and based on the harmonic current values ​​and the voltage THDu, three of the most typical risk points are identified. Based on the current harmonics and voltage THDu of these three risk points, it is determined whether the site is suitable for installing an energy storage system and whether it is necessary to install an APF for power quality management. Then, based on the calculated APF capacity, the improvement value of current harmonics and voltage THDu after installing the APF is calculated.

[0033] See Figure 6Based on the peak-valley electricity price difference, two segments were selected within a 24-hour period for full-charge and discharge analysis: segment I (t0~t2) and segment II (t2~t5). The graph shows that if segment I (charge, t0~t1) is fully charged using the transformer's remaining capacity (smargin), and segment I (discharge, t1~t2) is discharged according to load demand, the transformer will not be fully discharged by time point t2, indicating this configuration is too large. Conversely, if segment II (charge, t2~t3) is fully charged using the transformer's remaining capacity (smargin), and segment II (discharge, t3~t5) is discharged according to load demand, the transformer will be fully discharged by time point t4, before time point t5, indicating this configuration is suitable. Therefore, the system configuration uses the maximum charging capacity of Stage II (1279kWh) as the "Battery configuration capacity (theoretical value)". With a single cabinet capacity configured at 314kWh, rounding 1279kWh / 314kWh = 4.073 to 4 (number of units), the "Battery configuration capacity (actual value)" is 314kWh. 4 units = 1256kWh; Since the system operates for 2 hours, the "PCS configuration capacity" is 1256kWh / 2h = 628kVA. Assuming a "system unit price" of 0.58 yuan / Wh, the "total cost" is 1000. 1256kWh 0.58 yuan / Wh = 728,480 yuan; daily off-peak electricity price 2 and peak electricity price 2, "daily income" is 2. 1256kWh (1.0318-0.2814)=1885 yuan, then the "break-even point" is "total cost" / "daily profit"=728480 / 1885 = 386.461 days.

[0034] See Figure 7As mentioned earlier, the entire system is divided into a "data acquisition subsystem" and a "data analysis and energy storage configuration subsystem." Therefore, the system implementation process is also divided into two phases. Phase 1 is the on-site data acquisition phase, where on-site load and power quality data are stored daily in a large-capacity data storage device (MSD) with a USB interface. Phase 2 is the data analysis phase, where the host computer software reads the data stored in the MSD and performs analysis daily. In Phase 1, the system is initialized first, and voltage and current are acquired separately (voltage acquisition and current acquisition). The acquired voltage signals are subjected to RMS value calculation, harmonic analysis, and power calculation. Similarly, after acquiring the current, current harmonic analysis, RMS value calculation, and power calculation are performed. The MSD data storage module is used to store the data corresponding to the RMS value calculation, harmonic analysis, and power calculation, respectively. In Phase 2, the process begins by determining if data collection is complete. If complete, Phase 2 proceeds by using the maximum THD value to search for voltage sampling data and current harmonic spikes to search for current sampling data. Based on the sampling data, the transformer's spare capacity is calculated. Voltage risk points (RISK_U) are recorded, and the maximum harmonic component of the voltage is calculated. If the maximum harmonic component exceeds 10%, the system is deemed unsuitable for pile-based energy storage; if it does not exceed 10%, it is deemed suitable for energy storage installation. Current risk points (RISK_C) are recorded, and the APF capacity (required active power filter capacity) is calculated based on this current. The current mitigation effect is calculated based on the APF capacity, and the improvement in current harmonic values ​​and voltage THD after APF installation is calculated. After calculating the transformer's spare capacity, the system is divided into two segments (Section I and Section II) based on electricity charges to determine which segment to allocate capacity to. Then, the current capacity and PCS capacity are calculated, and the total system cost and daily revenue are calculated to estimate the payback period. Finally, the configuration results and power quality results are recorded.

[0035] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A field measurement and intelligent solution configuration system for industrial and commercial energy storage, characterized in that, It includes a data acquisition subsystem and a data analysis and energy storage configuration subsystem; The data acquisition subsystem includes a transformer, a main control module, a voltage isolation sampling module, a current isolation sampling module, and a load. The primary side of the transformer is used to connect to the three-phase voltage, the secondary side of the transformer is connected to the isolation sampling module and the load, and the main control module is connected to the isolation sampling module. The data analysis and energy storage configuration subsystem includes a power value detection module, a risk recording module, a power quality configuration module, and an energy storage system configuration module. The power value detection module, the risk recording module, and the energy storage system configuration module are all connected to the main control module, and the energy storage system configuration module and the power quality configuration module are all connected to the risk recording module. The voltage isolation sampling module is used to differentially sample the AC voltage output from the secondary side of the transformer and perform voltage conversion processing to output a weak single-ended signal. The current isolation sampling module converts the differential signal output from the flexible probe into a weak single-ended signal. The main control module receives the weak single-ended signal, calculates the power quality and power of the voltage and current, and saves them in the storage module in chronological order. The data analysis and energy storage configuration subsystem reads data from the storage module. The risk recording module receives the detection results of the power value detection module on the power quality and power of the voltage and current, and records the risk points for energy storage capacity configuration and power quality management equipment (APF) capacity configuration.

2. The industrial and commercial energy storage field measurement and intelligent solution configuration system according to claim 1, characterized in that, The data acquisition subsystem also includes an LDO module and an SMPS module. The main control module, the voltage isolation sampling module, the current isolation sampling module, and the SMPS module are all connected to the LDO module. The isolation sampling module and the load are all connected to the SMPS module. The LDO module is used to provide a stable voltage to the main control module, and the SMPS module is used to power the entire system.

3. The industrial and commercial energy storage field measurement and intelligent solution configuration system according to claim 2, characterized in that, The data acquisition subsystem further includes an interaction module and a storage module. Both the interaction module and the storage module are connected to the main control module. The storage module is used to store the sampling and calculation data of the weak current single-ended signal processed by the main control module. The interaction module is used to display the effective values ​​of voltage and current, harmonic components of voltage and current, or communication status and storage status corresponding to the sampling and calculation data. The interaction module is also used to execute at least one of the following commands: power on, power off, store, or clear.

4. The industrial and commercial energy storage field measurement and intelligent solution configuration system according to claim 3, characterized in that, The isolation sampling module includes multiple voltage sampling isolation channels and multiple current sampling isolation channels. The voltage sampling isolation channel includes a first ADC unit and a first DAC unit. The first ADC unit is used to convert the differential signal into a first high-frequency pulse signal. The first DAC unit receives the first high-frequency pulse signal and restores it to a first weak single-ended signal. The current sampling isolation channel includes a current probe, a second ADC unit, and a second DAC unit. The current probe is used to acquire the current signal corresponding to the differential voltage and send the voltage signal corresponding to the current signal to the second ADC unit. The second ADC unit is used to convert the voltage signal into a second high-frequency pulse signal. The second DAC unit converts the second high-frequency pulse signal into a second low-voltage single-ended signal. The main control module receives the first low-voltage single-ended signal and the second low-voltage single-ended signal.

5. The industrial and commercial energy storage field measurement and intelligent solution configuration system according to claim 1, characterized in that, Both the first and second weak single-ended signals are 0~3V voltages, and the current signal is mA-level current.

6. The industrial and commercial energy storage field measurement and intelligent solution configuration system according to claim 1, characterized in that, The main control module includes an RMS_U3 module, an RMS_I3 module, an APT module, an APM module, and an IAP module. The RMS_U3 module is used to calculate the effective value of the three-phase voltage. It calculates the effective value of the instantaneous three-phase voltage using the root mean square method of the period, and the corresponding expression is: （1） in, , , Representing the instantaneous values ​​of the three-phase voltages, respectively, we obtain... , , Three effective voltage values; The RMS_I3 module is used to calculate the effective value of the three-phase current, which is derived from the instantaneous value of the three-phase current. , , The effective value of the current was calculated. , , ; The APT module is used to calculate apparent power based on the RMS values ​​of three-phase voltage and three-phase current. The corresponding expression is: （2） APM (Active Power Calculation) is used to calculate active power based on the instantaneous values ​​of three-phase voltage and three-phase current. The corresponding expression is: （3） The IAP module is used to calculate reactive power Q, and the corresponding expression is: （4） Where T represents the period and k represents a natural number.

7. The industrial and commercial energy storage field measurement and intelligent solution configuration system according to claim 6, characterized in that, The main control module also includes a Clarke3 module, a Park_P module, a Park_N module, an RMS_2 module, and a THD module. The Clarke3 module is used to perform Clarke transformation on the instantaneous values ​​of the three-phase voltages. , The value is obtained, and the positive sequence harmonic components of the voltage are calculated using the Park_P and RMS_2 modules. ; , The negative sequence harmonic components of the voltage are obtained by calculation using the Park_N module and the RMS_2 module. ,in, , ; The THD module calculates the harmonic components of voltage and current, using formula (5) as the expression for the proportion of the positive sequence nth harmonic component of voltage. The calculation expression is (6): （5） （6）。 8. The industrial and commercial energy storage field measurement and intelligent solution configuration system according to claim 1, characterized in that, The power detection module is used to traverse voltage harmonic components and detect the power value of the isolation sampling module. When the voltage harmonic component exceeds the standard, or the voltage drops or is too low, the risk recording module is triggered to record the relevant data of the risk point corresponding to the voltage harmonic component to obtain a data group. The power quality configuration module summarizes and analyzes the relevant data of the risk points to determine whether the power quality of the system is suitable for installing an energy storage system, and provides three levels of risk point warnings from high to low.

9. The industrial and commercial energy storage field measurement and intelligent solution configuration system according to claim 8, characterized in that, When the current harmonic components traversed by the power detection module exceed a preset threshold, the required capacity of the active filter is given according to the excess value corresponding to the current harmonic components.

10. The industrial and commercial energy storage field measurement and intelligent solution configuration system according to claim 9, characterized in that, The energy storage system configuration module calculates the converter capacity and battery capacity configuration based on the difference between the actual power data and the rated capacity of the transformer, as well as the active and reactive power data and the time-of-use electricity price. It also calculates the number of daily charging cycles or discharging cycles based on the peak-valley electricity price difference and the battery capacity to determine the daily economic return. The energy storage system configuration module also calculates the overall system cost and the overall system cost recovery period based on the daily economic return.

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