Automatic energy-saving online operation and maintenance method, device and storage medium for power substation batteries suitable for independent systems

Abstract

The invention discloses an automatic energy-saving online operation and maintenance method, device and storage medium for power substation storage batteries suitable for independent systems, including starting a pre-core capacity self-check; the remote core capacity master compares and judges all the states before the core capacity one by one, and when the core capacity conditions are met, the remote core capacity master controls the silicon chain drive unit to drive the normally open contactor KO1 of the step-down silicon chain unit to close, and then disconnects the normally closed contactor KC1, and after the normally closed contactor KC1 is safely disconnected, the normally open contactor KO1 is disconnected; the remote core capacity master monitors the discharge current of the battery group to the DC power load in real time, and controls the start of the DC / AC compensation discharge unit, and the remote core capacity master controls the battery terminal input current of the DC / AC compensation discharge unit in real time; the remote core capacity master judges that the core capacity termination condition is reached, stops the DC / AC compensation discharge unit, controls the normally open contactor KO1 of the step-down silicon chain unit to close, the normally closed contactor KC1 is closed, and the normally open contactor KO1 is disconnected, and the system is restored. It is suitable for substation storage battery operation and maintenance.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery monitoring, and in particular relates to an automatic energy-saving online operation and maintenance method, device and storage medium for a battery in an independent power substation. Background Art

[0002] At present, the battery capacity verification technology is to cut off the battery from the DC bus to discharge the battery. As the last guarantee of the DC system, the battery pack is not allowed to be connected in series with any devices and equipment in principle, and the reliable connection between the battery pack and the bus must be guaranteed. The high-current normally closed contactor used in battery monitoring has poor current switching capability, and current switching is very likely to cause contactor contact failure.

[0003] In addition, the current of the DC power load is generally configured to be smaller than that of the battery pack, resulting in the battery pack's core capacity current failing to meet the standard requirements, and dynamic compensation is required through DC / AC to ensure the constant current discharge of the battery pack. The current technology directly cuts off the battery bus and then uses DC / AC to discharge the AC actual load. This approach is very risky and will cause the battery to be unable to switch back to the DC bus in time. The battery pack's power is directly provided to the DC power load for consumption, and AC or DC bus voltage loss occurs during the core capacity process.

[0004] Therefore, how to design a safer and more reliable power supply voltage reduction protection, improve battery utilization efficiency, and intelligently complete functions such as nuclear capacity control, discharge optimization, and fault diagnosis is an urgent problem to be solved in current battery management technology. Summary of the invention

[0005] In view of the defects existing in the above-mentioned prior art, the present invention provides an automatic energy-saving online operation and maintenance method for power substation batteries of an independent system, wherein the independent system comprises: a field equipment layer, including a battery pack, a driving device and a sensor monitoring device, wherein the battery pack comprises a battery, a temperature sensor and a voltage acquisition unit, and the driving device comprises a silicon chain unit and a DC / AC converter; an edge computing layer, including an edge computing unit and a programmable logic controller PLC, wherein the edge computing unit is an embedded computer based on the ARM architecture, which collects and pre-processes field equipment data, monitors battery pack status data in real time, and transmits data to the PLC controller; the PLC controller receives the battery status data of the edge computing unit, and performs core capacity control according to the monitoring data; a system control layer, including a SCADA system and a battery remote platform, wherein the SCADA system provides a graphical human-computer interaction interface to display the operating status and historical trends in real time;

[0006] The method further comprises the following steps:

[0007] Step 1: When capacity verification is required, the capacity verification instruction issued by the battery remote platform is transmitted to the remote capacity verification main control unit through the background communication unit;

[0008] Step 2, the remote core capacity main control unit starts a pre-core capacity self-check after receiving the core capacity instruction;

[0009] Step 3, the remote core capacity master controller sends a battery status acquisition instruction to the battery pack edge computing terminal, and the battery pack edge computing terminal drives the battery monitoring sensor to perform an internal resistance spectrum test, collect temperature and voltage parameters, and feeds back the battery status to the remote core capacity master controller;

[0010] Step 4, the remote core capacity master control compares and judges all the states before the core capacity one by one. When the core capacity conditions are met, the remote core capacity master control controls the silicon chain drive unit to drive the normally open contactor KO1 of the step-down silicon chain unit to close, and then disconnect the normally closed contactor KC1. After the normally closed contactor KC1 is safely disconnected, the normally open contactor KO1 is disconnected;

[0011] Step 5, the remote core capacity master control monitors the discharge current of the battery group to the DC power load in real time, and controls the DC / AC compensation discharge unit to start. After starting, the DC / AC compensation discharge unit converts the DC power of the battery group into AC power to provide power for the actual AC load. The remote core capacity master control controls the battery terminal input current of the DC / AC compensation discharge unit in real time, wherein the total discharge current of the battery group is equal to the sum of the DC power load current and the DC / AC battery terminal input current;

[0012] Step 6, the remote core capacity master control determines that the core capacity termination condition has been reached, stops the DC / AC compensation discharge unit, and controls the normally open contactor KO1 of the step-down silicon chain unit to close when it is determined that the DC power supply is working normally, and the normally closed contactor KC1 is closed and the normally open contactor KO1 is disconnected, and the system recovers.

[0013] The step of feeding back the battery status to the remote core capacity master control comprises:

[0014] The current acquisition unit feeds back the acquired battery pack current status to the remote core capacity main control, and the voltage acquisition unit acquires the battery pack voltage and DC bus voltage and sends them to the remote core capacity main control in real time.

[0015] It also includes that the auxiliary power supply unit converts the DC bus voltage into the 12V / 5V / 3.3V voltage required by the equipment to power the remote core capacity main control, and the power supply of the auxiliary power supply unit comes from the DC bus.

[0016] Among them, a DC / AC inverter is also used to convert the DC power of the battery pack into AC power, including:

[0017] Establish an equivalent circuit model of the battery, including open circuit voltage, internal resistance, and capacitance parameters, and use Kalman filtering or extended Kalman filtering algorithm to estimate the battery SOC in real time;

[0018] Determine the optimal charging and discharging power of the battery according to the load demand and voltage frequency, and use PI or fuzzy control algorithm to adjust the charging and discharging current of the battery;

[0019] Space vector modulation SVPWM or sinusoidal wave PWM algorithm is used to generate the switching signal of the inverter to control the output voltage / current.

[0020] Among them, reducing the voltage of the DC power supply to check the battery capacity includes:

[0021] By adjusting the output voltage of the DC power supply, the charging voltage of the battery is reduced, thereby limiting the maximum charging capacitance of the battery;

[0022] Divide the charging process into multiple stages, with lower voltage used in the first stage and standard charging voltage used in the last stage;

[0023] A voltage limiting circuit is added between the DC power supply and the battery to limit the voltage to a preset level.

[0024] This also includes,

[0025] Use high-precision Hall effect current sensors and install them on the positive and negative wires of the battery pack to collect the battery pack current;

[0026] Amplify and filter the analog voltage signal output by the sensor;

[0027] Use a high-precision ADC module to convert analog signals into digital current values, and perform filtering and averaging to eliminate noise interference;

[0028] The processed current data is sent to the remote core capacity main control unit through the communication interface.

[0029] This also includes,

[0030] The OPA2277 operational amplifier and the high-precision, low-temperature drift resistor voltage divider circuit are used to appropriately amplify the voltage to be measured;

[0031] Provide bias voltage and bias current compensation for the operational amplifier to reduce the measurement error caused by input bias voltage and input bias current;

[0032] Add RC filter circuit at the output stage of the operational amplifier to remove high-frequency noise interference;

[0033] The amplified and filtered voltage signal is connected to the ADC input of the microcontroller, the sampling rate and resolution parameters of the ADC are configured, and the collected digital voltage value is filtered and normalized to obtain the final voltage measurement result.

[0034] The nuclear capacity termination conditions are reached, including at least one of the following:

[0035] The discharge setting time is reached, the discharge setting capacity is reached, the discharge setting voltage lower limit is reached, the discharge setting single-cell lower limit voltage is reached, etc. Abnormal conditions such as temperature exceeding the set threshold, DC bus voltage exceeding the set threshold, battery pack voltage exceeding the set threshold, and abnormal alarms for each unit of the equipment.

[0036] The present invention transmits the core capacity instruction issued by the battery remote platform to the remote core capacity main control unit through the background communication unit; the remote core capacity main control unit starts the pre-core capacity self-check after receiving the core capacity instruction; the remote core capacity main control compares and judges all the states before the core capacity one by one, and when the core capacity condition is met, the remote core capacity main control controls the silicon chain drive unit to drive the normally open contactor KO1 of the step-down silicon chain unit to close, and then disconnects the normally closed contactor KC1, and after the normally closed contactor KC1 is safely disconnected, the normally open contactor KO1 is disconnected; the remote core capacity main control monitors the discharge current of the battery group to the DC power load in real time, and controls the start of the DC / AC compensation discharge unit; the remote core capacity main control determines that the core capacity termination condition is reached, and stops the DC / AC compensation discharge unit. By utilizing DC power supply voltage reduction protection, battery direct power supply discharge technology and DC / AC inverter compensation discharge technology, power supply voltage reduction protection can be achieved more safely and reliably. By adopting an independent system architecture, the battery management efficiency can be further improved, and functions such as core capacity control can be completed intelligently, thereby improving system performance and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] By reading the following detailed description with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0038] Figure 1 The invention is a flow chart showing an automatic energy-saving online operation and maintenance method of a power substation storage battery suitable for an independent system according to an embodiment of the present invention.

[0039] Figure 2 The circuit structure of an automatic energy-saving online operation and maintenance device for a power substation battery suitable for an independent system according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0042] It should be understood that although the terms first, second, third, etc. may be used to describe ... in the embodiments of the present invention, these ... should not be limited to these terms. These terms are only used to distinguish .... For example, without departing from the scope of the embodiments of the present invention, the first ... may also be referred to as the second ..., and similarly, the second ... may also be referred to as the first ....

[0043] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0044] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0045] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0046] The battery capacity verification technology is to cut off the battery from the DC bus and discharge the battery. As the last guarantee of the DC system, the battery pack is not allowed to be connected in series with any devices and equipment in principle, and the reliable connection between the battery pack and the bus must be guaranteed. The high-current normally closed contactor used in battery monitoring has poor current switching capability, and current switching is very likely to cause contactor contact failure.

[0047] The current of the DC power load is generally configured to be smaller than that of the battery pack, resulting in the battery pack's core capacity current failing to meet the standard requirements. Dynamic compensation is required through DC / AC to ensure constant current discharge of the battery pack. The current technology directly cuts off the battery from the bus and then uses DC / AC to discharge the AC actual load. This approach is very risky and will cause the battery to be unable to switch back to the DC bus in time. The battery pack's power is directly provided to the DC power load for consumption, and AC or DC bus voltage loss occurs during the core capacity process.

[0048] like Figure 1 and Figure 2 As shown, the present invention discloses an automatic energy-saving online operation and maintenance method for a power substation battery suitable for an independent system.

[0049] A three-layer distributed architecture is used to build an overall independent system. The first layer is the field equipment layer, including battery packs, sensors, drive equipment, etc.; the second layer is the edge computing layer, including edge computing units and PLC controllers; the third layer is the upper monitoring layer, including the SCADA system and the battery remote platform.

[0050] Among them, the battery pack in the field equipment layer includes a storage battery, a temperature sensor and a voltage acquisition unit, and the driving device includes a silicon chain unit and a DC / AC converter; the edge computing unit in the edge computing layer is an embedded computer based on the ARM architecture, which collects and pre-processes field equipment data, monitors the battery pack status data in real time, and transmits data to the PLC controller; the PLC controller receives the battery status data of the edge computing unit, and performs core capacity control according to the monitoring data; the SCADA system in the system control layer provides a graphical human-computer interaction interface to display the operating status and historical trends in real time.

[0051] Dividing independent systems into three independent levels can reduce single points of failure and improve the overall reliability of the system. It can achieve independent fault monitoring and self-healing processing to improve system availability. It can also provide redundant backup and remote fault diagnosis to ensure long-term stable operation of the system. The three-layer architecture is connected through standard interfaces to facilitate functional expansion and upgrading. The edge computing layer and PLC controller can be flexibly configured for field equipment of different sizes. The three-layer distributed architecture can give full play to the functional advantages of each layer and improve the reliability, scalability and operation and maintenance efficiency of the system.

[0052] The method further comprises the following steps:

[0053] Step 1: When capacity verification is required, the capacity verification instruction issued by the battery remote platform is transmitted to the remote capacity verification main control unit through the background communication unit.

[0054] In one embodiment, the power supply of the auxiliary power supply unit 403 comes from the DC bus. The auxiliary power supply unit 403 converts the DC bus voltage into the 12V / 5V / 3.3V voltage required by the device to power the remote core capacity master 401.

[0055] Step 2: After receiving the core capacity instruction, the remote core capacity main control unit starts a pre-core capacity self-check.

[0056] In a certain embodiment, when capacity verification is required, a capacity verification instruction is sent by the battery remote platform 601 and transmitted to the remote capacity verification master control 401 through the background communication unit 409, and the remote capacity verification master control 401 starts the self-check work before capacity verification.

[0057] Step 3: The remote core capacity master controller sends a battery status acquisition instruction to the battery pack edge computing terminal. The battery pack edge computing terminal drives the battery monitoring sensor to perform an internal resistance spectrum test, collect temperature and voltage parameters, and feeds back the battery status to the remote core capacity master controller.

[0058] In a certain embodiment, the remote core capacity master control 401 requests the battery group edge computing terminal 301 for the status instruction of each battery cell, the battery group edge computing terminal 301 drives the battery monitoring sensor 101 to perform internal resistance spectrum testing, temperature, and voltage parameter collection, the battery edge computing terminal 301 feeds back the battery status to the remote core capacity master control 401, the current collection unit 406 feeds back the acquired battery group current status to the remote core capacity master control 401, and the voltage collection unit 407 collects the battery group voltage and DC bus voltage and sends them to the remote core capacity master control 401 in real time.

[0059] The step of feeding back the battery status to the remote core capacity master control comprises:

[0060] The current acquisition unit feeds back the acquired battery pack current status to the remote core capacity main control, and the voltage acquisition unit acquires the battery pack voltage and DC bus voltage and sends them to the remote core capacity main control in real time.

[0061] In one embodiment, a DC / AC inversion method is also used to convert the DC power of the battery pack into AC power, including:

[0062] Establish an equivalent circuit model of the battery, including open circuit voltage, internal resistance, and capacitance parameters, and use Kalman filtering or extended Kalman filtering algorithm to estimate the battery SOC in real time;

[0063] Determine the optimal charging and discharging power of the battery according to the load demand and voltage frequency, and use PI or fuzzy control algorithm to adjust the charging and discharging current of the battery;

[0064] Space vector modulation SVPWM or sinusoidal wave PWM algorithm is used to generate the switching signal of the inverter to control the output voltage / current.

[0065] This also includes,

[0066] Use high-precision Hall effect current sensors and install them on the positive and negative wires of the battery pack to collect the battery pack current;

[0067] Amplify and filter the analog voltage signal output by the sensor;

[0068] Use a high-precision ADC module to convert analog signals into digital current values, and perform filtering and averaging to eliminate noise interference;

[0069] The processed current data is sent to the remote core capacity main control unit through the communication interface.

[0070] Step 4, the remote core capacity master control compares and judges all the states before the core capacity one by one. When the core capacity conditions are met, the remote core capacity master control controls the silicon chain drive unit to drive the normally open contactor KO1 of the step-down silicon chain unit to close, and then disconnect the normally closed contactor KC1. After the normally closed contactor KC1 is safely disconnected, the normally open contactor KO1 is disconnected.

[0071] In a certain embodiment, the remote core capacity master control 401 determines whether the core capacity conditions are met. When the preset conditions are met, the remote core capacity master control 401 controls the silicon chain drive unit 408 and drives the normally open contactor KO1 of the step-down silicon chain unit 402 to close, and then disconnects the normally closed contactor KC1. After the normally closed contactor KC1 is safely disconnected, the KO1 normally open contactor is disconnected.

[0072] In a certain embodiment, due to the poor current switching capability of the normally closed contactor KC1, it is necessary to perform a protective action through the normally open contactor KO1 that supports current switching. The normally closed contactor is the key channel of the entire system. To ensure that the DC power supply 701 is connected to the outside, the step-down voltage of the step-down silicon chain is a fixed value, generally 18% of the rated voltage range of the battery pack, or the lower limit of the discharge voltage of the battery pack. The bus output voltage of the DC power supply 701 is reduced to a level lower than the battery pack voltage through the step-down silicon chain 402. At this time, the battery pack directly provides electrical energy to the DC power load 501. Because the DC power load 501 of the power is relatively small and cannot meet the current of 0.1C10A required by the core capacity specification of the battery pack, it is necessary to increase the DC power load on the DC bus. In order to avoid waste of electrical energy and heat loss, a DC / AC inverter is used to convert the DC power of the battery pack into AC power for use by the actual AC load.

[0073] Among them, reducing the voltage of the DC power supply to check the battery capacity includes:

[0074] By adjusting the output voltage of the DC power supply, the charging voltage of the battery is reduced, thereby limiting the maximum charging capacitance of the battery;

[0075] Divide the charging process into multiple stages, with lower voltage used in the first stage and standard charging voltage used in the last stage;

[0076] A voltage limiting circuit is added between the DC power supply and the battery to limit the voltage to a preset level.

[0077] This also includes,

[0078] The OPA2277 operational amplifier and the high-precision, low-temperature drift resistor voltage divider circuit are used to appropriately amplify the voltage to be measured;

[0079] Provide bias voltage and bias current compensation for the operational amplifier to reduce the measurement error caused by input bias voltage and input bias current;

[0080] Add RC filter circuit at the output stage of the operational amplifier to remove high-frequency noise interference;

[0081] The amplified and filtered voltage signal is connected to the ADC input of the microcontroller, the sampling rate and resolution parameters of the ADC are configured, and the collected digital voltage value is filtered and normalized to obtain the final voltage measurement result.

[0082] Step 5, the remote core capacity master control monitors the discharge current of the battery group to the DC power load in real time, and controls the DC / AC compensation discharge unit to start. After starting, the DC / AC compensation discharge unit converts the DC power of the battery group into AC power to provide power for the actual AC load. The remote core capacity master control controls the battery end input current of the DC / AC compensation discharge unit in real time, wherein the total discharge current of the battery group is equal to the sum of the DC power load current and the DC / AC battery end input current.

[0083] In a certain embodiment, the remote core capacity master control 401 can also monitor the discharge current of the battery group to the DC power load 501 in real time, and control the DC / AC compensation discharge unit 405 according to the real-time monitoring result. The DC / AC compensation discharge unit 405 is used to convert the DC power of the battery group into AC power. The remote core capacity master control 401 also controls the battery end input current of the DC / AC compensation discharge unit in real time to ensure that the total discharge current of the battery group (0.1C10A) = DC power load current + DC / AC battery end input current.

[0084] Step 6, the remote core capacity master control determines that the core capacity termination condition has been reached, stops the DC / AC compensation discharge unit, and controls the normally open contactor KO1 of the step-down silicon chain unit to close when it is determined that the DC power supply is working normally, and the normally closed contactor KC1 is closed and the normally open contactor KO1 is disconnected, and the system recovers.

[0085] In a certain embodiment, the core capacity discharge process stops normally until the core capacity termination condition is reached, such as the discharge setting time is reached, the discharge setting capacity is reached, the discharge setting voltage lower limit is reached, the discharge setting single-cell lower limit voltage is reached, etc. Abnormal conditions such as temperature exceeding the set threshold, DC bus voltage exceeding the set threshold, battery pack voltage exceeding the set threshold, abnormal alarms of each unit of the equipment, etc. will terminate the core capacity process and stop the core capacity process. The remote core capacity master control 401 determines that the core capacity termination condition is reached, first stops the DC / AC compensation discharge unit 405, and when it is determined that the DC power supply 701 is working normally, the normally open contactor KO1 of the step-down silicon chain unit 402 is closed, the normally closed contactor KC1 is closed, and the normally open contactor KO1 is disconnected, and the system recovers.

[0086] Among them, because the current of the DC power load is generally configured to be 0.05C10 or even smaller than the battery pack, the core capacity current of the battery pack cannot meet the standard requirements, and dynamic compensation is performed through DC / AC to ensure the constant current discharge of the battery pack. The current technology is to directly cut off the battery bus and then use DC / AC to discharge the actual AC load. This approach is very risky and will cause the battery to be unable to switch back to the DC bus in time. The battery pack's electric energy is directly provided to the DC power load for consumption. In the process of core capacity, there is an AC voltage loss or a DC bus voltage loss. Because the battery pack has always been supplying power to the DC power load, there is no switching risk. By reducing the voltage of the DC power supply, it is further possible to ensure that the battery directly supplies power to the power load, thereby realizing the process of battery core capacity.

[0087] The present invention transmits the core capacity instruction issued by the battery remote platform to the remote core capacity main control unit through the background communication unit; the remote core capacity main control unit starts the pre-core capacity self-check after receiving the core capacity instruction; the remote core capacity main control compares and judges all the states before the core capacity one by one, and when the core capacity condition is met, the remote core capacity main control controls the silicon chain drive unit to drive the normally open contactor KO1 of the step-down silicon chain unit to close, and then disconnects the normally closed contactor KC1, and after the normally closed contactor KC1 is safely disconnected, the normally open contactor KO1 is disconnected; the remote core capacity main control monitors the discharge current of the battery group to the DC power load in real time, and controls the start of the DC / AC compensation discharge unit; the remote core capacity main control determines that the core capacity termination condition is reached, and stops the DC / AC compensation discharge unit. By utilizing DC power supply voltage reduction protection, battery direct power supply discharge technology and DC / AC inverter compensation discharge technology, power supply voltage reduction protection can be achieved more safely and reliably. By adopting an independent system architecture, the battery management efficiency can be further improved, and functions such as core capacity control can be completed intelligently, thereby improving system performance and reliability.

[0088] It should be noted that the computer-readable medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, 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 above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0089] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0090] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0091] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0092] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit does not, in some cases, limit the unit itself.

[0093] The above introduces the preferred embodiments of the present invention, which is intended to make the spirit of the present invention clearer and easier to understand, but is not intended to limit the present invention. All modifications, substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection outlined by the claims attached to the present invention.

Claims

1. An automatic energy-saving online operation and maintenance method for a power substation battery in an independent system, characterized in that: The independent system includes: a field device layer, including a battery pack, a drive device and a sensor monitoring device, the battery pack includes a storage battery, a temperature sensor and a voltage acquisition unit, and the drive device includes a silicon chain unit and a DC / AC converter; an edge computing layer, including an edge computing unit and a programmable logic controller PLC, the edge computing unit is an embedded computer based on the ARM architecture, which collects and pre-processes field device data, monitors battery pack status data in real time, and transmits data to the PLC controller; the PLC controller receives the battery status data of the edge computing unit and performs core capacity control according to the monitoring data; the system control layer includes a SCADA system and a battery remote platform, the SCADA system provides a graphical human-computer interaction interface, and displays the operating status and historical trends in real time; The method further comprises the following steps: Step 1: When capacity verification is required, the capacity verification instruction issued by the battery remote platform is transmitted to the remote capacity verification main control unit through the background communication unit; Step 2, the remote core capacity main control unit starts a pre-core capacity self-check after receiving the core capacity instruction; Step 3, the remote core capacity master controller sends a battery status acquisition instruction to the battery pack edge computing terminal, and the battery pack edge computing terminal drives the battery monitoring sensor to perform an internal resistance spectrum test, collect temperature and voltage parameters, and feeds back the battery status to the remote core capacity master controller; Step 4, the remote core capacity master control compares and judges all the states before the core capacity one by one. When the core capacity conditions are met, the remote core capacity master control controls the silicon chain drive unit to drive the normally open contactor KO1 of the step-down silicon chain unit to close, and then disconnect the normally closed contactor KC1. After the normally closed contactor KC1 is safely disconnected, the normally open contactor KO1 is disconnected; Step 5, the remote core capacity master control monitors the discharge current of the battery group to the DC power load in real time, and controls the DC / AC compensation discharge unit to start. After starting, the DC / AC compensation discharge unit converts the DC power of the battery group into AC power to provide power for the actual AC load. The remote core capacity master control controls the battery terminal input current of the DC / AC compensation discharge unit in real time, wherein the total discharge current of the battery group is equal to the sum of the DC power load current and the DC / AC battery terminal input current; Step 6, the remote core capacity master control determines that the core capacity termination condition is reached, stops the DC / AC compensation discharge unit, and controls the normally open contactor KO1 of the step-down silicon chain unit to close, the normally closed contactor KC1 to close, and the normally open contactor KO1 to disconnect when the DC power supply is determined to be working normally, and the system is restored; The DC power supply is connected in series with the step-down silicon chain unit and then connected in parallel with the battery. The step-down silicon chain unit is composed of a diode D1, a normally open contactor KO1 and a normally closed contactor KC1, wherein the diode D1 is connected in parallel with the normally open contactor KO1 and the normally closed contactor KC1 respectively.

2. The automatic energy-saving online operation and maintenance method of the power substation battery of the independent system as claimed in claim 1 is characterized in that: Feeding back the battery status to the remote core capacity master control includes: The current acquisition unit feeds back the acquired battery pack current status to the remote core capacity main control, and the voltage acquisition unit acquires the battery pack voltage and DC bus voltage and sends them to the remote core capacity main control in real time.

3. The automatic energy-saving online operation and maintenance method of the power substation battery of the independent system as claimed in claim 1 is characterized in that: The auxiliary power supply unit converts the DC bus voltage into the 12V / 5V / 3.3V voltage required by the device to power the remote core capacity main control. The power supply of the auxiliary power supply unit comes from the DC bus.

4. The automatic energy-saving online operation and maintenance method of the power substation battery of the independent system as claimed in claim 1 is characterized in that: The DC / AC inverter method is used to convert the DC power of the battery pack into AC power, including: Establish an equivalent circuit model of the battery, including open circuit voltage, internal resistance, and capacitance parameters, and use Kalman filtering or extended Kalman filtering algorithm to estimate the battery SOC in real time; Determine the optimal charging and discharging power of the battery according to the load demand and voltage frequency, and use PI or fuzzy control algorithm to adjust the charging and discharging current of the battery; Space vector modulation SVPWM or sinusoidal wave PWM algorithm is used to generate the switching signal of the inverter to control the output voltage / current.

5. The automatic energy-saving online operation and maintenance method of the power substation battery of the independent system as claimed in claim 1 is characterized in that: Reducing the voltage of the DC power supply to check the battery capacity includes: By adjusting the output voltage of the DC power supply, the charging voltage of the battery is reduced, thereby limiting the maximum charging capacitance of the battery; Divide the charging process into multiple stages, with lower voltage used in the first stage and standard charging voltage used in the last stage; A voltage limiting circuit is added between the DC power supply and the battery to limit the voltage to a preset level.

6. The automatic energy-saving online operation and maintenance method of the power substation battery of the independent system as claimed in claim 1 is characterized in that: Use high-precision Hall effect current sensors and install them on the positive and negative wires of the battery pack to collect the battery pack current; Amplify and filter the analog voltage signal output by the sensor; Use a high-precision ADC module to convert analog signals into digital current values, and perform filtering and averaging to eliminate noise interference; The processed current data is sent to the remote core capacity main control unit through the communication interface.

7. The automatic energy-saving online operation and maintenance method of the power substation battery of the independent system as claimed in claim 1 is characterized in that: The OPA2277 operational amplifier and the high-precision, low-temperature drift resistor voltage divider circuit are used to appropriately amplify the voltage to be measured; Provide bias voltage and bias current compensation for the operational amplifier to reduce the measurement error caused by input bias voltage and input bias current; Add RC filter circuit at the output stage of the operational amplifier to remove high-frequency noise interference; The amplified and filtered voltage signal is connected to the ADC input of the microcontroller, the sampling rate and resolution parameters of the ADC are configured, and the collected digital voltage value is filtered and normalized to obtain the final voltage measurement result.

8. The automatic energy-saving online operation and maintenance method of the power substation battery of the independent system as claimed in claim 1 is characterized in that: The nuclear capacity termination conditions are reached, including at least one of the following: The discharge setting time is reached, the discharge setting capacity is reached, the discharge setting voltage lower limit is reached, the discharge setting single-cell lower limit voltage is reached, abnormal conditions such as temperature exceeds the set threshold, DC bus voltage exceeds the set threshold, battery pack voltage exceeds the set threshold, and abnormal alarms are issued for each unit of the equipment.

9. An automatic energy-saving online operation and maintenance device for a power substation battery of an independent system, comprising: at least one processor; as well as at least one memory including computer program code, The at least one memory and the computer program code are configured to, together with the at least one processor, enable the system to execute the method according to any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the method according to any one of claims 1 to 8 when executed by a processor.

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