CN117937667A - A shunt current acquisition temperature compensation system and method in an energy storage system - Google Patents
A shunt current acquisition temperature compensation system and method in an energy storage system Download PDFInfo
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Abstract
本发明属于电池储能系统技术领域，具体涉及一种储能系统中分流器电流采集温度补偿系统及方法，系统包括采集模块、储能主控模块以及用于为储能主控模块供电的AC‑DC模块；所述采集模块用于实时采集高压箱内部高压回路的电流值和温度值；所述储能主控模块用于基于预设的温度检测算法对所述温度值进行实时读取，并将所述温度值与预设温度区间进行匹配，以控制储能系统进入第一响应状态或依据预设的温度补偿算法对所述电流值采集精度进行补偿，本发明中补偿系统主要应用于储能系统的高压箱内，针对市面上不同类型的分流器来实测温度和电流值的补偿系数来分段补偿，从而避免因环境温度变化影响分流器对高压回路的电流采集精度的偏差，提高电流采集的精度。
The present invention belongs to the technical field of battery energy storage systems, and specifically relates to a shunt current acquisition temperature compensation system and method in an energy storage system. The system includes an acquisition module, an energy storage main control module, and an AC-DC module for powering the energy storage main control module; the acquisition module is used to acquire the current value and temperature value of a high-voltage circuit inside a high-voltage box in real time; the energy storage main control module is used to read the temperature value in real time based on a preset temperature detection algorithm, and match the temperature value with a preset temperature range to control the energy storage system to enter a first response state or compensate for the current value acquisition accuracy according to a preset temperature compensation algorithm. The compensation system in the present invention is mainly used in a high-voltage box of an energy storage system, and the compensation coefficients of the temperature and current values are measured for different types of shunts on the market to perform segmented compensation, thereby avoiding the deviation of the current acquisition accuracy of the shunt for the high-voltage circuit due to changes in ambient temperature, and improving the accuracy of current acquisition.
Description
技术领域Technical Field
本发明属于电池储能系统技术领域，具体涉及一种储能系统中分流器电流采集温度补偿系统及方法。The present invention belongs to the technical field of battery energy storage systems, and in particular relates to a shunt current acquisition temperature compensation system and method in an energy storage system.
背景技术Background technique
储能系统高压箱主要功能用于控制系统电气主回路连通或断开，其内部安装的电池管理单元(简称BMS)可同时实时监测电池电压、电流、温度及开关、接触器、风机等的状态，对本地电池组进行状态判别、热管理控制、均衡控制等操作，同时上送本地电池信息及响应遥控控制。The main function of the high-voltage box of the energy storage system is to control the connection or disconnection of the main electrical circuit of the system. The battery management unit (BMS) installed inside it can monitor the battery voltage, current, temperature and the status of switches, contactors, fans, etc. in real time, and perform status identification, thermal management control, balancing control and other operations on the local battery pack, while sending local battery information and responding to remote control.
随着储能电池行业的发展和市场规模的扩大，系统产品性能的完善和优化，对储能电池系统采集高压回路电流精度要求更加严格。温度补偿在采集高压回路的电流不只是在分流器上会影响到采集电流精度，其实温度也会影响我们的运算放大器、ADC采集芯片、隔离通信以及储能主控MCU运算单元，考虑到分流器本身受温度影响大和NTC温度传感器安装在分流器上便于实现，所以优先考虑使用分流器电流采集温度补偿来提高精度。With the development of the energy storage battery industry and the expansion of the market scale, the improvement and optimization of system product performance have put more stringent requirements on the accuracy of current collection in high-voltage circuits of energy storage battery systems. Temperature compensation will not only affect the accuracy of current collection in the shunt when collecting the current in the high-voltage circuit, but temperature will also affect our operational amplifiers, ADC acquisition chips, isolated communications, and energy storage main control MCU computing units. Considering that the shunt itself is greatly affected by temperature and the NTC temperature sensor is installed on the shunt for easy implementation, the use of shunt current collection temperature compensation to improve accuracy is given priority.
然而普遍采用高精度的分流器去采集高压回路的电流，忽略了分流器本身随温度变化对采集精度的影响，通常储能电池系统的高压回路电流采集位于高压箱内，其处于一个密闭的环境加上里面带有功率性器件，温度变化范围较大，因此，如何根据环境温度实现对电流采集精度的补偿是本领域技术人员亟需解决的问题。However, high-precision shunts are generally used to collect current in high-voltage circuits, ignoring the effect of the shunt itself on the collection accuracy as the temperature changes. Usually, the high-voltage circuit current collection of the energy storage battery system is located in the high-voltage box, which is in a closed environment and contains power devices, and the temperature variation range is large. Therefore, how to compensate for the current collection accuracy according to the ambient temperature is an urgent problem that technicians in this field need to solve.
发明内容Summary of the invention
本发明的目的就在于提供一种储能系统中分流器电流采集温度补偿系统及方法，以解决背景技术中提出的问题。The purpose of the present invention is to provide a shunt current acquisition temperature compensation system and method in an energy storage system to solve the problems raised in the background technology.
本发明通过以下技术方案来实现上述目的：The present invention achieves the above-mentioned purpose through the following technical solutions:
一种储能系统中分流器电流采集温度补偿系统，所述补偿系统设于储能系统高压箱内部，包括采集模块、储能主控模块以及用于为储能主控模块供电的AC-DC模块；A shunt current acquisition temperature compensation system in an energy storage system, wherein the compensation system is arranged inside a high-voltage box of the energy storage system, and comprises an acquisition module, an energy storage main control module, and an AC-DC module for powering the energy storage main control module;
所述采集模块用于实时采集高压箱内部高压回路的电流值和温度值；The acquisition module is used to collect the current value and temperature value of the high-voltage circuit inside the high-voltage box in real time;
所述储能主控模块用于基于预设的温度检测算法对所述温度值进行实时读取，并将所述温度值与预设温度区间进行匹配，以控制储能系统进入第一响应状态或依据预设的温度补偿算法对所述电流值采集精度进行补偿。The energy storage main control module is used to read the temperature value in real time based on a preset temperature detection algorithm, and match the temperature value with a preset temperature range to control the energy storage system to enter a first response state or compensate for the current value acquisition accuracy according to a preset temperature compensation algorithm.
作为本发明的进一步优化方案，所述温补模块包括分流器和NTC温度传感器，所述分流器串联在所述高压回路，NTC温度传感器放置于所述分流器周边位置，用于实时采集分流器周围温度并作为分流器的所述温度值。As a further optimization scheme of the present invention, the temperature compensation module includes a shunt and an NTC temperature sensor. The shunt is connected in series to the high-voltage circuit, and the NTC temperature sensor is placed around the shunt for real-time collection of the ambient temperature of the shunt as the temperature value of the shunt.
作为本发明的进一步优化方案，所述高压箱内部还设有用于控制高压回路的通断的通断控制模块，通断控制模块包括直流断路器、主正继电器、主负继电器、预充继电器以及预充电阻。As a further optimization scheme of the present invention, the high-voltage box is also provided with an on-off control module for controlling the on-off of the high-voltage circuit. The on-off control module includes a DC circuit breaker, a main positive relay, a main negative relay, a pre-charging relay and a pre-charging resistor.
作为本发明的进一步优化方案，所述第一响应状态为：As a further optimization solution of the present invention, the first response state is:
当所述温度值不在预设温度区间时，所述储能主控模块向所述通断控制模块发出控制信号，用于切断所述高压回路。When the temperature value is not within the preset temperature range, the energy storage main control module sends a control signal to the on-off control module to cut off the high-voltage circuit.
作为本发明的进一步优化方案，所述储能主控模块包括ADC采样单元、隔离SPI通信单元和MCU处理单元，所述温度检测算法为NTC温度传感器和电阻分压后将电压值经ADC采样单元和隔离SPI通信单元发送给MCU处理单元，MCU处理单元根据所述电压值来确定NTC电阻值，将所述NTC电阻值和温度对照表进行比对来读取所述温度值。As a further optimization scheme of the present invention, the energy storage main control module includes an ADC sampling unit, an isolated SPI communication unit and an MCU processing unit. The temperature detection algorithm is that the voltage value is sent to the MCU processing unit through the ADC sampling unit and the isolated SPI communication unit after the NTC temperature sensor and the resistor divider. The MCU processing unit determines the NTC resistance value according to the voltage value, and compares the NTC resistance value with the temperature comparison table to read the temperature value.
作为本发明的进一步优化方案，所述温度补偿算法为分段插值补偿法，确定实时采集的电流值与设定分段温度的补偿系数，基于所述补偿系数对所述电流值采集精度进行补偿。As a further optimization scheme of the present invention, the temperature compensation algorithm is a segmented interpolation compensation method, which determines the compensation coefficient of the real-time collected current value and the set segmented temperature, and compensates for the current value collection accuracy based on the compensation coefficient.
一种储能系统中分流器电流采集温度补偿方法，基于以上任一项所述系统实施，包括如下步骤：A method for temperature compensation of shunt current acquisition in an energy storage system, based on any of the above-mentioned systems, comprises the following steps:
S1、实时采集高压箱内部高压回路的电流值和温度值；S1, real-time collection of current and temperature values of the high-voltage circuit inside the high-voltage box;
S2、所述储能主控模块用于基于预设的温度检测算法对所述温度值进行实时读取，并将所述温度值与预设温度区间进行匹配，以控制储能系统进入第一响应状态或依据预设的温度补偿算法对所述电流值采集精度进行补偿。S2. The energy storage main control module is used to read the temperature value in real time based on a preset temperature detection algorithm, and match the temperature value with a preset temperature range to control the energy storage system to enter a first response state or compensate for the current value acquisition accuracy according to a preset temperature compensation algorithm.
本发明的有益效果在于：The beneficial effects of the present invention are:
本发明中补偿系统主要应用于储能系统的高压箱内，针对市面上不同类型的分流器来实测温度和电流值的补偿系数来分段补偿，从而避免因环境温度变化影响分流器对高压回路的电流采集精度的偏差，提高电流采集的精度。The compensation system in the present invention is mainly used in the high-voltage box of the energy storage system. The compensation coefficients of the temperature and current values of different types of shunts on the market are measured for segmented compensation, thereby avoiding the deviation of the current collection accuracy of the shunt for the high-voltage circuit due to changes in ambient temperature and improving the accuracy of current collection.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1是本发明中储能系统高压箱内部框体；FIG1 is an internal frame of a high-voltage box of an energy storage system in the present invention;
图2是本发明中分流器电流温度采集框体；FIG2 is a current temperature acquisition frame of the shunt in the present invention;
图3是本发明中补偿方法的执行流程图。FIG3 is a flowchart of the execution of the compensation method in the present invention.
具体实施方式Detailed ways
下面结合附图对本申请作进一步详细描述，有必要在此指出的是，以下具体实施方式只用于对本申请进行进一步的说明，不能理解为对本申请保护范围的限制，该领域的技术人员可以根据上述申请内容对本申请作出一些非本质的改进和调整。The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.
实施例1Example 1
本实施方式提出了一种储能系统中分流器电流采集温度补偿系统，补偿系统设于储能系统高压箱内部，包括采集模块、储能主控模块以及用于为储能主控模块供电的AC-DC模块；This embodiment proposes a shunt current acquisition temperature compensation system in an energy storage system. The compensation system is arranged inside the high-voltage box of the energy storage system, and includes an acquisition module, an energy storage main control module, and an AC-DC module for powering the energy storage main control module;
采集模块用于实时采集高压箱内部高压回路的电流值和温度值；The acquisition module is used to collect the current value and temperature value of the high-voltage circuit inside the high-voltage box in real time;
储能主控模块用于基于预设的温度检测算法对温度值进行实时读取，并将温度值与预设温度区间进行匹配，以控制储能系统进入第一响应状态或依据预设的温度补偿算法对电流值采集精度进行补偿。The energy storage main control module is used to read the temperature value in real time based on a preset temperature detection algorithm, and match the temperature value with a preset temperature range to control the energy storage system to enter the first response state or compensate for the current value acquisition accuracy according to a preset temperature compensation algorithm.
参照图1，所述储能主控模块位于高压箱内，负责管理一簇电池组的信号收集、分流器的电流和温度采集以及补偿算法(温度检测算法和温度补偿算法)的实现，其属于储能系统二级管理单元。采集模块位于高压箱内，负责实时采集高压回路的电流和分流器的温度，由分流器和NTC温度传感器组成，储能主控模块采集分流器在回路上的电流和读取NTC温度传感器的温度。Referring to Figure 1, the energy storage main control module is located in the high-voltage box, responsible for managing the signal collection of a cluster of battery packs, the current and temperature collection of the shunt, and the implementation of the compensation algorithm (temperature detection algorithm and temperature compensation algorithm), which belongs to the secondary management unit of the energy storage system. The acquisition module is located in the high-voltage box, responsible for real-time acquisition of the current of the high-voltage circuit and the temperature of the shunt, and is composed of a shunt and an NTC temperature sensor. The energy storage main control module collects the current of the shunt in the circuit and reads the temperature of the NTC temperature sensor.
本实施例中，分流器串联在高压回路，NTC温度传感器放置于分流器周边位置，用于实时采集分流器周围温度并作为分流器的温度值。In this embodiment, the shunt is connected in series to the high-voltage circuit, and the NTC temperature sensor is placed around the shunt to collect the ambient temperature of the shunt in real time as the temperature value of the shunt.
作为进一步优化方案，高压箱内部还设有用于控制高压回路的通断的通断控制模块，通断控制模块包括直流断路器、主正继电器、主负继电器、预充继电器以及预充电阻。As a further optimization solution, an on-off control module for controlling the on-off of the high-voltage circuit is also provided inside the high-voltage box. The on-off control module includes a DC circuit breaker, a main positive relay, a main negative relay, a pre-charging relay and a pre-charging resistor.
作为进一步优化方案，第一响应状态为：As a further optimization solution, the first response status is:
当温度值不在预设温度区间时，储能主控模块向通断控制模块发出控制信号，用于切断高压回路。When the temperature value is not within the preset temperature range, the energy storage main control module sends a control signal to the on-off control module to cut off the high-voltage circuit.
可以理解的是，通过实时采集分流器温度可以检测其使用环境温度，当检测温度不在其工作温度(温度区间)时，可以停止系统工作或者系统做出响应措施，这样可以保护分流器本身以及整个系统。It can be understood that by collecting the diverter temperature in real time, its operating environment temperature can be detected. When the detected temperature is not within its operating temperature (temperature range), the system can be stopped or the system can take response measures, thereby protecting the diverter itself and the entire system.
参照图2，作为进一步优化方案，储能主控模块包括ADC采样单元、隔离SPI通信单元和MCU处理单元，温度检测算法为NTC温度传感器和电阻R1分压后将电压值经ADC采样单元和隔离SPI通信单元发送给MCU处理单元，MCU处理单元根据电压值来确定NTC电阻值，NTC电阻值(V1表示MCU处理单元采集的电压值)，将NTC电阻值和温度对照表进行比对来读取温度值。Referring to Figure 2, as a further optimization solution, the energy storage main control module includes an ADC sampling unit, an isolated SPI communication unit and an MCU processing unit. The temperature detection algorithm is that the NTC temperature sensor and the resistor R1 divide the voltage and send the voltage value to the MCU processing unit through the ADC sampling unit and the isolated SPI communication unit. The MCU processing unit determines the NTC resistance value according to the voltage value. (V1 represents the voltage value collected by the MCU processing unit), and the temperature value is read by comparing the NTC resistance value with the temperature comparison table.
本实施例中，分流器的采样电流值通过储能主控模块获取，包括运算放大器电路，支持差分输入，可检测充电和放电电流，分流器输入与采集电流的差分走线，5V供电电压和2.5V基准电压；In this embodiment, the sampled current value of the shunt is obtained through the energy storage main control module, which includes an operational amplifier circuit, supports differential input, can detect charging and discharging currents, differential routing between the shunt input and the collected current, 5V supply voltage and 2.5V reference voltage;
本实施例中，ADC采样单元，支持SPI通信，8口模拟信号输入可兼容检测高压采集、温度采集、运算放大器2.5V基准电压采集、分流器差分输入电压经运放放大后的电压采集，5V供电电压和2.5V基准电压；In this embodiment, the ADC sampling unit supports SPI communication, and the 8-port analog signal input is compatible with the detection of high voltage acquisition, temperature acquisition, operational amplifier 2.5V reference voltage acquisition, shunt differential input voltage after operational amplifier amplification voltage acquisition, 5V power supply voltage and 2.5V reference voltage;
本实施例中，隔离SPI通信单元，储能主控MCU和高压侧通信实现隔离，隔离双电源输入高压侧5V电源和匹配MCU侧的3.3V电源，隔离电压5.7KVrms。In this embodiment, the SPI communication unit is isolated, the energy storage main control MCU and the high-voltage side communication are isolated, the 5V power supply on the high-voltage side of the dual power input is isolated and the 3.3V power supply on the matching MCU side is isolated, and the isolation voltage is 5.7KVrms.
作为进一步优化方案，温度补偿算法为分段插值补偿法，确定实时采集的电流值与设定分段温度的补偿系数，基于补偿系数对电流值采集精度进行补偿。As a further optimization solution, the temperature compensation algorithm is a segmented interpolation compensation method, which determines the compensation coefficient of the real-time collected current value and the set segmented temperature, and compensates for the current value collection accuracy based on the compensation coefficient.
示例的，采用分段插值补偿法，例如设置工作温度为-25℃～+70℃(实际储能设备工作温度为-20℃～+65℃)，间隔5℃得出采集的电流值随温度变化的关系，考虑到该温度与电流值不是线性关系，故可以采用分段表示温度与电流值的补偿系数。用NTC实时采集分流器的温度，根据采集电流和分段温度的补偿系数，此时不同的温度对应不同分段的补偿系数，这样精度更高。For example, the segmented interpolation compensation method is used. For example, the operating temperature is set to -25℃～+70℃ (the actual operating temperature of the energy storage device is -20℃～+65℃), and the relationship between the collected current value and the temperature change is obtained at intervals of 5℃. Considering that the temperature and current value are not linear, the compensation coefficient of the temperature and current value can be expressed in segments. The temperature of the shunt is collected in real time by NTC. According to the compensation coefficient of the collected current and segmented temperature, different temperatures correspond to different segmented compensation coefficients, which has higher accuracy.
另外，在上述实施例的基础上，温度补偿包括但不限于如下方式：通过分流器固有的温度和分流器的阻值特征曲线来补偿温度对采集电流精度的影响、以及点斜式温度补偿算法。In addition, based on the above embodiments, temperature compensation includes but is not limited to the following methods: compensating the influence of temperature on the accuracy of current collection through the inherent temperature of the shunt and the resistance characteristic curve of the shunt, and a point-slope temperature compensation algorithm.
综上，上述分流器电流采集温度补偿系统的工作方式如下：In summary, the working mode of the above shunt current acquisition temperature compensation system is as follows:
参照图2，NTC温度传感器固定在分流器上，实时采集分流器的温度，经分压电路后到ADC采样，在经SPI隔离通信进入MCU处理单元；分流器固定在高压箱的高压回路铜排上，实时采集回路的电流，分流器的差分信号经运算放大器后到ADC采集和SPI隔离通信进入MCU处理单元；储能主控模块的MCU处理单元负责实现分流器温度、高压回路电流的采集和计算、以及温度补偿精度的策略实现。Referring to Figure 2, the NTC temperature sensor is fixed on the shunt to collect the temperature of the shunt in real time, and then goes to the ADC for sampling after passing through the voltage divider circuit, and then enters the MCU processing unit through SPI isolation communication; the shunt is fixed on the high-voltage circuit copper bus of the high-voltage box to collect the current of the circuit in real time, and the differential signal of the shunt is collected by the ADC and enters the MCU processing unit through SPI isolation communication after passing through the operational amplifier; the MCU processing unit of the energy storage main control module is responsible for realizing the collection and calculation of the shunt temperature and high-voltage circuit current, as well as the strategy implementation of temperature compensation accuracy.
为了实现上述实施例，基于同一发明构思，本实施例中还提供了与上述补偿系统对应的补偿方法，由于本公开实施例中的补偿方法解决问题的原理与本公开实施例上述补偿系统相似，因此方法的实施可以参见系统的实施，重复之处不再赘述。In order to implement the above-mentioned embodiments, based on the same inventive concept, a compensation method corresponding to the above-mentioned compensation system is also provided in this embodiment. Since the principle of solving the problem by the compensation method in the embodiment of the present disclosure is similar to the above-mentioned compensation system in the embodiment of the present disclosure, the implementation of the method can refer to the implementation of the system, and the repeated parts will not be repeated.
参照图3，本实施方式提供了一种储能系统中分流器电流采集温度补偿方法，基于以上系统实施，包括如下步骤：3 , this embodiment provides a method for temperature compensation of shunt current acquisition in an energy storage system, which is implemented based on the above system and includes the following steps:
S1、实时采集高压箱内部高压回路的电流值和温度值；S1, real-time collection of current and temperature values of the high-voltage circuit inside the high-voltage box;
S2、储能主控模块用于基于预设的温度检测算法对温度值进行读取，并将温度值与预设温度区间进行匹配，以控制储能系统进入第一响应状态或依据预设的温度补偿算法对电流值采集精度进行补偿。S2. The energy storage main control module is used to read the temperature value based on a preset temperature detection algorithm and match the temperature value with a preset temperature range to control the energy storage system to enter the first response state or compensate for the current value acquisition accuracy according to a preset temperature compensation algorithm.
本实施例中，NTC温度传感器放置与分流器周边位置来实时采集其周围温度，该温度值经储能主控模块ADC采集和隔离通信后发送给储能主控模块MCU读取，MCU根据读取的温度和本身分流器的阻值与温度特性曲线来补偿温度对分流器采集电流带来的误差，从而提高分流器采集电流的精度，同时采集到分流器的温度使其工作在正常的使用温度范围起到保护分流器以及高压箱系统的作用。In this embodiment, the NTC temperature sensor is placed around the shunt to collect the surrounding temperature in real time. The temperature value is collected by the ADC of the energy storage main control module and isolated communication is sent to the MCU of the energy storage main control module for reading. The MCU compensates for the error caused by the temperature on the shunt current collection based on the read temperature and the resistance and temperature characteristic curve of the shunt itself, thereby improving the accuracy of the shunt current collection. At the same time, the temperature of the shunt is collected to make it work within the normal operating temperature range to protect the shunt and the high-voltage box system.
以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不驱使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
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