CN-122017677-A - Line detection method and energy storage system

CN122017677ACN 122017677 ACN122017677 ACN 122017677ACN-122017677-A

Abstract

The application provides a line detection method and an energy storage system, wherein the energy storage system comprises at least one energy storage unit, the energy storage unit comprises a converter device and an energy storage battery which has a corresponding relation with the converter device, the method comprises the steps of detecting abnormal charge and discharge of the energy storage battery based on at least one of a first electric energy parameter of the converter device, an operation state of the converter device, a second electric energy parameter of the energy storage battery and an operation state of the energy storage battery under the condition that the energy storage system is in an operation state, and determining that the line between the converter device and the energy storage battery in the energy storage unit is abnormal if the condition that the energy storage battery in the energy storage unit has the abnormal charge and discharge of a preset type and the duration time of the abnormal charge and discharge of the preset type is longer than a duration threshold value corresponding to the preset type is detected. The circuit abnormality between the converter device and the energy storage battery can be detected rapidly and accurately through the application.

Inventors

ZHANG LI
CAI ZHIXIN
CAI XINGLONG
WANG LI

Assignees

阳光电源股份有限公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (10)

1. The line detection method is characterized by being applied to an energy storage system, wherein the energy storage system comprises at least one energy storage unit, the energy storage unit comprises a converter device and an energy storage battery which has a corresponding relation with the converter device, and the method comprises the following steps: Detecting charge and discharge anomalies of the energy storage battery in the energy storage unit based on at least one of a first electric energy parameter of the converter device, an operating state of the converter device, a second electric energy parameter of the energy storage battery and an operating state of the energy storage battery when the energy storage system is in an operating state; if the fact that the energy storage battery in the energy storage unit is in a charging and discharging abnormality of a preset type is detected, and the duration time of the charging and discharging abnormality of the preset type is longer than a duration threshold value corresponding to the preset type, determining that a line between a current conversion device in the energy storage unit and the energy storage battery is abnormal.
2. The method of claim 1, wherein the first electrical energy parameter comprises at least one of a current, a voltage, and a power of the converter device, and the second electrical energy parameter comprises at least one of a remaining charge, a current, and a voltage of the energy storage battery; Correspondingly, the detecting the abnormal charge and discharge of the energy storage battery in the energy storage unit based on at least one of the first electric energy parameter of the converter, the operation state of the converter, the second electric energy parameter of the energy storage battery and the operation state of the energy storage battery includes: If the energy storage battery is in a fault state, the converter device is in a shutdown state and the current of the energy storage battery exceeds the limit, determining that the energy storage battery of the energy storage unit has a preset first type of charge-discharge abnormality; If the energy storage battery is not in a fault state, the residual electric quantity of the energy storage battery is larger than a preset electric quantity upper limit protection threshold value, the power of the converter device is zero, and the current of the energy storage battery exceeds a preset charging current threshold value, determining that the energy storage battery of the energy storage unit has a preset second type of charging and discharging abnormality; If the energy storage battery is not in a fault state, the residual electric quantity of the energy storage battery is smaller than a preset electric quantity lower limit value, the power of the converter device is zero, and the current of the energy storage battery exceeds a preset discharging current threshold value, determining that the energy storage battery of the energy storage unit has a preset third type of abnormal charging and discharging; If the energy storage battery is not in a fault state, the residual electric quantity of the energy storage battery does not exceed a preset electric quantity upper limit value, the residual electric quantity of the energy storage battery does not exceed a preset electric quantity lower limit value, the energy storage unit is in an operation state, and the fact that the current of the converter device is not matched with the current of the energy storage battery is detected, determining that a preset fourth type of charge-discharge abnormality exists in the energy storage unit; If the energy storage battery is not in a fault state, the residual electric quantity of the energy storage battery does not exceed a preset electric quantity upper limit value, the residual electric quantity of the energy storage battery does not exceed a preset electric quantity lower limit value, the energy storage unit is in an operating state, and the fact that the voltage of the converter device is not matched with the voltage of the energy storage battery is detected, the fact that a preset fifth type of charge-discharge abnormality exists in the energy storage unit is determined.
3. The method of claim 2, wherein detecting that the current of the current commutating device does not match the current of the energy storage battery comprises: determining the fluctuation current corresponding to the current of the converter device; Determining a target current fluctuation range corresponding to the converter according to the current of the energy storage battery and the fluctuation current; And if the current of the current conversion device is not in the target current fluctuation range, determining that the current of the current conversion device is not matched with the current of the energy storage battery.
4. The method of claim 2, wherein detecting that the voltage of the converter device does not match the voltage of the energy storage battery comprises: determining a fluctuation voltage corresponding to the voltage of the converter device; determining a target voltage fluctuation range corresponding to the converter according to the voltage of the energy storage battery and the fluctuation voltage; And if the voltage of the converter device is not in the target voltage fluctuation range, determining that the voltage of the converter device is not matched with the voltage of the energy storage battery.
5. The method of claim 1, wherein the detecting of the charge-discharge abnormality of the energy storage battery in the energy storage unit based on at least one of the first electrical energy parameter of the converter device, the operational state of the converter device, the second electrical energy parameter of the energy storage battery, and the operational state of the energy storage battery comprises: Detecting whether a first electric energy parameter in the converter device is matched with a second electric energy parameter of the energy storage battery; If the first electric energy parameter in the converter device is not matched with the second electric energy parameter of the energy storage battery, determining that the energy storage battery in the energy storage unit has abnormal charge and discharge.
6. The method of claim 1, wherein after determining a line anomaly between a current conversion device and an energy storage battery in the energy storage unit, further comprising: and controlling the energy storage system to stop running, and outputting the identification of the converter device in the energy storage power supply and the identification of the energy storage battery.
7. The method of claim 6, wherein after said controlling the energy storage system to cease operation further comprises: Receiving fault configuration operation of a user; controlling the start of units in the energy storage system except for the energy storage unit with abnormal line under the condition that the fault configuration operation is a first type of fault configuration operation; and under the condition that the fault configuration operation is a second type of fault configuration operation, changing the corresponding relation between the converter device and the energy storage battery in the energy storage unit with abnormal line, and controlling the energy storage system to start after changing the corresponding relation between the converter device and the energy storage battery.
8. An energy storage system, comprising: Each energy storage unit comprises a converter device and an energy storage battery which has a corresponding relation with the converter device; The converter device in each energy storage unit is used for converting alternating current in the power grid to obtain direct current, outputting the direct current obtained by conversion to an energy storage battery connected with the converter device, or converting the direct current in the energy storage battery connected with the converter device to obtain alternating current, and outputting the alternating current obtained by conversion to the power grid; the energy storage battery in each energy storage unit is used for storing direct current output by the converter device connected with the energy storage battery or outputting direct current to the converter device connected with the energy storage battery; The control device is used for detecting charge and discharge abnormality of the energy storage batteries in each energy storage unit based on at least one of a first electric energy parameter of the current conversion device and a second electric energy parameter of the energy storage battery in each energy storage unit when the energy storage system is in an operation state, and determining that a circuit between the current conversion device and the energy storage battery in each energy storage unit is abnormal if the fact that the charge and discharge abnormality of a preset type exists in any energy storage battery in any energy storage unit and the duration time of the charge and discharge abnormality of the preset type is longer than a duration threshold corresponding to the preset type is detected.
9. The system of claim 8, further comprising a battery information collector; The battery information collector is used for collecting battery data of the energy storage batteries in each energy storage unit, sending the collected battery data of each energy storage battery to the control device, and the battery data of each energy storage battery comprise the running state of each energy storage battery and second electric quantity data.
10. The system of claim 8, further comprising a transformer; The transformer is connected with the alternating current side of the converter in each energy storage unit and is used for boosting the alternating current output by at least one converter, transmitting the boosted alternating current to a power grid, or reducing the alternating current in the power grid and transmitting the reduced alternating current to at least one converter.

Description

Line detection method and energy storage system Technical Field The application relates to the technical field of energy storage, in particular to a line detection method and an energy storage system. Background The energy storage converter is used as a key bridge for connecting the energy storage battery array with a power grid, and has the core responsibility of accurately regulating and controlling the charge and discharge cycle of the battery to realize the efficient conversion of direct-current electric energy and alternating-current electric energy. Through an intelligent charge and discharge management strategy, the converter device can ensure that the energy storage system responds to a power scheduling instruction of the power grid, and meets the requirement of flexible scheduling. However, as the complexity of the energy storage system increases, there is a risk of misconnection of the lines between the converter device and the battery pack, which may lead to overcharging or overdischarging of the battery during long-term operation, ultimately compromising the overall performance and life of the energy storage system. Therefore, how to effectively prevent and solve such problems becomes an important issue for ensuring the stable operation of the energy storage system. Disclosure of Invention In view of the above, the present application provides a line detection method and an energy storage system, which can rapidly and accurately detect a line abnormality between a converter device and an energy storage battery, and the specific scheme is as follows: The line detection method is applied to an energy storage system, the energy storage system comprises at least one energy storage unit, the energy storage unit comprises a converter device and an energy storage battery which has a corresponding relation with the converter device, and the method comprises the following steps: Detecting charge and discharge anomalies of the energy storage battery in the energy storage unit based on at least one of a first electric energy parameter of the converter device, an operating state of the converter device, a second electric energy parameter of the energy storage battery and an operating state of the energy storage battery when the energy storage system is in an operating state; if the fact that the energy storage battery in the energy storage unit is in a charging and discharging abnormality of a preset type is detected, and the duration time of the charging and discharging abnormality of the preset type is longer than a duration threshold value corresponding to the preset type, determining that a line between a current conversion device in the energy storage unit and the energy storage battery is abnormal. The method comprises the steps that the first electric energy parameter comprises at least one of current, voltage and power of the converter device, and the second electric energy parameter comprises at least one of residual electric quantity, current and voltage of the energy storage battery; Correspondingly, the detecting the abnormal charge and discharge of the energy storage battery in the energy storage unit based on at least one of the first electric energy parameter of the converter, the operation state of the converter, the second electric energy parameter of the energy storage battery and the operation state of the energy storage battery includes: If the energy storage battery is in a fault state, the converter device is in a shutdown state and the current of the energy storage battery exceeds the limit, determining that the energy storage battery of the energy storage unit has a preset first type of charge-discharge abnormality; If the energy storage battery is not in a fault state, the residual electric quantity of the energy storage battery is larger than a preset electric quantity upper limit protection threshold value, the power of the converter device is zero, and the current of the energy storage battery exceeds a preset charging current threshold value, determining that the energy storage battery of the energy storage unit has a preset second type of charging and discharging abnormality; If the energy storage battery is not in a fault state, the residual electric quantity of the energy storage battery is smaller than a preset electric quantity lower limit value, the power of the converter device is zero, and the current of the energy storage battery exceeds a preset discharging current threshold value, determining that the energy storage battery of the energy storage unit has a preset third type of abnormal charging and discharging; If the energy storage battery is not in a fault state, the residual electric quantity of the energy storage battery does not exceed a preset electric quantity upper limit value, the residual electric quantity of the energy storage battery does not exceed a preset electric quantity lower limit value, the energy storage unit is in an operation state, and the fact