Brake frequency converter and energy storage charging circuit cooperative work system and method

Abstract

The invention relates to the technical field of ship braking management, particularly discloses a braking frequency converter and energy storage charging circuit cooperative work system and method, and is used for solving the problem of how to effectively manage and recover energy in the ship braking process. Comprising a brake energy recovery unit, a brake frequency converter and energy storage charging circuit system work control unit, a brake system unit, an energy storage system unit and a data and instruction processing unit. The brake frequency converter and energy storage charging circuit system work control unit is connected with the brake energy recovery unit, the brake system unit, the energy storage system unit and the data and instruction processing unit. Through comprehensive utilization of the brake frequency converter and the energy storage charging circuit, restriction of faults of the brake frequency converter on system operation is effectively avoided, reliability and safety of the system are improved, available electric energy is utilized to the maximum extent, energy consumption cost of the system is reduced, and carbon emission is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ship braking management, and more specifically, to a system and method for coordinated operation of a braking frequency converter and an energy storage charging circuit. Background Art

[0002] In the process of ship operation and maintenance, especially when it comes to the braking operation of large equipment, the energy management generated during the braking process is a crucial link. The solution commonly used in the current market is to process this energy through braking resistors. Although this solution is simple and low-cost, it has exposed some obvious defects in actual application. First of all, as an energy-consuming device, the braking resistor directly converts the electrical energy generated during braking into heat energy during operation and discharges it into the environment through a heat dissipation device. This method not only causes a large amount of electrical energy waste, but also causes the local temperature of the hull to rise, thereby affecting the normal operation of other electronic equipment. This kind of electrical energy waste will accumulate during the long-term operation and maintenance process, especially in operations that require frequent braking, which significantly increases the overall energy consumption and reduces the energy utilization efficiency of the system. Secondly, the working reliability of the braking resistor is crucial to the stability of the entire system. Once the braking resistor fails, the braking system will not work properly, which will in turn affect the safe operation of the entire system. This is a hidden danger that cannot be ignored in ship operation and maintenance, because the operation of the ship often requires the completion of complex tasks within a specified time. If the braking system has problems at a critical moment, it will directly affect the quality and efficiency of the task completion, and even threaten the safe navigation of the ship. In addition, due to the limited space in the hull, poor heat dissipation will cause heat to accumulate inside the hull, increase the cooling burden of the ship, and further affect the energy efficiency. For ships that operate for a long time, the frequent use of brake resistors not only accelerates the aging of equipment, but also increases maintenance costs and downtime. Therefore, how to effectively manage and recover energy during the ship's braking process to avoid these drawbacks has become an urgent problem to be solved in current ship operation and maintenance. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a system and method for the coordinated working of a braking inverter and an energy storage charging circuit. By comprehensively utilizing the braking inverter and the energy storage charging circuit, the constraints of the braking inverter failure on the system operation can be effectively avoided, and the available electrical energy can be utilized to the maximum extent.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A braking inverter and energy storage charging circuit collaborative working system, including a braking energy recovery unit, a braking inverter and energy storage charging circuit system working control unit, a braking system unit, an energy storage system unit, and a data and instruction processing unit. The braking inverter and energy storage charging circuit system working control unit are connected to the braking energy recovery unit, the braking system unit, the energy storage system unit, and the data and instruction processing unit. The braking inverter and energy storage charging circuit system working control unit includes a multi-position switch and a first fuse. The data and instruction processing unit includes a power supply busbar diagnosis collection unit, a battery health diagnosis collection unit, a braking resistor diagnosis collection unit, and a central Processor unit, the central processing unit is connected to the power supply busbar diagnosis collection unit, the battery health diagnosis collection unit, and the brake resistor diagnosis collection unit. The central processing unit receives data from the data and instruction processing unit, obtains the power supply busbar circuit diagnosis status value, the energy storage battery circuit diagnosis status value and the brake resistor circuit status diagnosis value through the set diagnosis strategy, and performs diagnosis processing through the preset diagnosis result formula. The result directly controls the multi-bit switch. The result obtained by the preset diagnosis formula is the weighted sum of the power supply busbar circuit diagnosis status value, the energy storage battery circuit diagnosis status value and the brake resistor circuit status diagnosis value. The preset diagnosis formula is:

[0006] S total =S MB ×α MB +S BMS ×α BMS +S BR ×α BR

[0007] Where: S total is the total diagnostic status value, S MB , S BMS , S BR are the power supply busbar circuit diagnostic status value, energy storage battery circuit diagnostic status value and brake resistor circuit diagnostic status value, respectively. MB , α BMS , α BR are the weights of the power supply busbar circuit diagnostic status value, the energy storage battery circuit diagnostic status value, and the brake resistor circuit diagnostic status value, which are 1, 2, and 4 respectively.

[0008] As a further scheme of the present invention, the braking energy recovery unit includes a three-phase AC motor, a motor frequency converter, a second fuse and a power supply busbar. When the three-phase AC motor is dragged by a heavy object or other equipment, the AC power generated by it is rectified into DC power by the motor frequency converter, and then the DC power is sent to the power supply busbar through the fuse. The three-phase AC motor is connected to the motor frequency converter, which is connected to the power supply busbar through the second fuse. The multi-position switching switch is connected to the power supply busbar through the first fuse. The braking system unit includes a braking resistor inverter and a braking resistor. The braking resistor is connected to the braking resistor inverter, and the braking resistor inverter is connected to the multi-position switching switch.

[0009] As a further solution of the present invention, the energy storage system unit includes a battery management system and an energy storage battery. The energy storage battery is connected to the battery management system, and the battery management system is connected to both the multi-position switch and the central processing unit.

[0010] As a further solution of the present invention, the power supply busbar diagnosis collection unit collects the insulation value and voltage of the power supply busbar, and the battery health diagnosis collection unit collects the charging voltage, charging current, resistance, power, temperature, operating time, charge and discharge status, and battery health status value of the energy storage battery, wherein the battery health status value is the inverse of the total number of failures, maintenance and replacements of the energy storage battery.

[0011] As a further solution of the present invention, a braking resistor diagnostic acquisition unit conducts data docking with the braking inverter through a bus communication module. The docked data includes the operating status value, voltage, current, resistance and health status value of the braking inverter. The health status value of the braking inverter is the inverse of the number of failures, maintenance and replacements of the braking inverter. The result obtained by the central processor communicates with the battery management system through the bus communication module.

[0012] A method for cooperative working of a braking frequency converter and an energy storage charging circuit, using the above-mentioned system for cooperative working of a braking frequency converter and an energy storage charging circuit, comprises the following steps:

[0013] Step 1, raw data collection: collect the data required for power bus diagnosis through the power bus diagnosis collection unit, collect the data required for battery health diagnosis through the battery health diagnosis collection unit, and collect the data required for brake resistor and brake inverter status diagnosis through the brake resistor diagnosis collection unit;

[0014] Step 2, obtaining the diagnostic value of each circuit state: obtaining the power supply busbar circuit diagnostic analysis value, the energy storage battery circuit diagnostic analysis value and the brake resistor circuit diagnostic analysis value respectively according to the preset power supply busbar circuit diagnostic formula, the energy storage battery circuit diagnostic analysis value and the brake resistor circuit diagnostic analysis value, analyzing the fault degree of each circuit by the obtained power supply busbar circuit diagnostic analysis value, the energy storage battery circuit diagnostic analysis value and the brake resistor circuit diagnostic analysis value, and obtaining the power supply busbar circuit diagnostic state value, the energy storage battery circuit diagnostic state value and the brake resistor circuit diagnostic state value according to the preset diagnostic strategy of each circuit;

[0015] Step 3, obtain the total diagnostic status value: obtain the total diagnostic status value according to the preset diagnostic formula, output the diagnostic status type of the power supply bus circuit, the energy storage battery circuit and the brake resistor circuit according to the value of the total diagnostic status value, and control the opening and closing of the power supply bus circuit, the energy storage battery circuit and the brake resistor circuit according to the diagnostic status type and the set execution strategy.

[0016] As a further solution of the present invention, in step 2, the power supply busbar circuit diagnosis formula is assumed to be:

[0017]

[0018] Where: k MB is the power supply busbar circuit diagnostic analysis value, I MB,safe I is the safety insulation value of the power supply busbar, which is set according to the requirements. MB is the current of the power supply busbar circuit, V MB is the voltage of the power supply busbar circuit, V MB,nom is the rated voltage of the power supply busbar, V MB,max 、V MB,min They are the maximum and minimum values ​​allowed for the voltage of the power supply busbar respectively;

[0019] The preset energy storage battery circuit diagnostic formula is:

[0020]

[0021] Where: k BMS is the diagnostic analysis value of the energy storage battery circuit, V BMS is the energy storage battery circuit voltage, V BMS,nom 、V MB,max 、V MB,min are the rated value, maximum allowable value and minimum allowable value of the energy storage battery circuit voltage, I MB is the energy storage battery circuit current, I BMS,nom ,I MB,max ,I MB,min are the rated value, maximum allowable value, and minimum allowable value of the energy storage battery circuit, respectively. BMS is the temperature of the energy storage battery, TBMS,nom 、T BMS,max 、T BMS,min are the rated value, maximum allowable value and minimum allowable value of the energy storage battery temperature, H BMS is the battery health status value of the energy storage battery, H BMS,safe It is the safety value of the battery health status value of the energy storage battery;

[0022] The preset brake resistor circuit diagnostic formula is:

[0023]

[0024] Where: k BR is the diagnostic analysis value of the brake resistor circuit, V BR is the braking resistor circuit voltage, V BR,nom 、V BR,max 、V BR,min are the rated value, maximum allowable value and minimum allowable value of the braking resistor circuit voltage, I BR is the braking resistor circuit current, I BR,nom ,I BR,max ,I BR,min They are the rated value, maximum allowable value, and minimum allowable value of the braking resistor circuit, H BR is the health status value of the brake inverter, H BR,safe It is the safe value of the health status value of the brake inverter.

[0025] As a further scheme of the present invention, in step 2, the strategy for power supply bus diagnosis is that if the power supply bus insulation value and the power supply bus voltage are within their respective safety setting ranges, the diagnostic state is 0, otherwise it is 1, and then the diagnostic states of the power supply bus insulation value and the power supply bus voltage are logically ORed to obtain the power supply bus circuit diagnostic state value; the charging voltage, charging current, resistance, power, temperature, operating time, charge and discharge state, and battery health status value of the energy storage battery are within their respective safety setting ranges, and the diagnostic state is 0, otherwise it is 1, and then the diagnostic states of the charging voltage, charging current, resistance, power, temperature, operating time, charge and discharge state, and battery health status value of the energy storage battery are logically ORed to obtain the energy storage battery circuit diagnostic state value; the voltage, braking current, and health status value of the braking resistor are within their respective set safety ranges, and the diagnostic state is 0, otherwise it is 1, and then the diagnostic states of the voltage, braking current, and health status value of the braking inverter are logically ORed to obtain the braking resistor circuit diagnostic state value.

[0026] As a further solution of the present invention, in step 3, the execution strategy set is:

[0027] S total=0, keep the power supply busbar, energy storage battery and brake resistor circuit powered;

[0028] S total =1, disconnect the power supply busbar circuit, and energize the energy storage battery and brake resistor circuit;

[0029] S total =2, disconnect the energy storage battery circuit, and energize the power supply busbar and brake resistor circuit;

[0030] S total =3, disconnect the power supply busbar and energy storage battery circuit, and energize the brake resistor circuit;

[0031] S total =4, disconnect the braking resistor circuit, and energize the power supply busbar and energy storage battery circuit;

[0032] S total =5, disconnect the power supply busbar and brake resistor circuit, and energize the energy storage battery circuit;

[0033] S total =6, disconnect the energy storage battery and brake resistor circuits, and energize the power busbar;

[0034] S total =7, disconnect the power supply busbar, energy storage battery and brake resistor circuit.

[0035] As a further solution of the present invention, in step 2, the strategy for power supply busbar circuit diagnosis is:

[0036] If the power bus insulation value is greater than or equal to the preset power bus safety insulation value, the power bus insulation state is normal and the diagnostic state is 0; if the power bus insulation value is less than the preset power bus safety insulation value, the power bus insulation value is abnormal and the diagnostic state is 1;

[0037] If the power bus voltage is within the set safety range, the power bus voltage status is normal and the diagnostic status is 0; if the power bus voltage is not within the set safety range, the power bus voltage status is abnormal and the diagnostic status is 1;

[0038] Perform a logical OR operation on the insulation and voltage status of the power supply busbar to obtain the power supply busbar circuit diagnosis status value.

[0039] As a further solution of the present invention, in step 2, the diagnostic strategy of the energy storage battery circuit is:

[0040] If the voltage of the energy storage battery is within the safe range, the voltage status of the energy storage battery is normal, and the diagnostic status is 0; if the voltage of the energy storage battery is not within the safe range, the voltage status of the energy storage battery is abnormal, and the diagnostic status is 1;

[0041] If the current of the energy storage battery is within the safe range, the current state of the energy storage battery is normal, and the diagnostic state is 0; if the current of the energy storage battery is not within the safe range, the current state of the energy storage battery is abnormal, and the diagnostic state is 1;

[0042] If the temperature of the energy storage battery is within the safe range, the temperature state of the energy storage battery is normal, and the diagnostic state is 0; if the temperature of the energy storage battery is not within the safe range, the temperature state of the energy storage battery is abnormal, and the diagnostic state is 1;

[0043] If the battery health status value of the energy storage battery is within the safe range, the battery health status value of the energy storage battery is normal, and the diagnostic status is 0, if the battery health status value of the energy storage battery is not within the safe range, the battery health status value of the energy storage battery is abnormal, and the diagnostic status is 1;

[0044] Perform a logical OR operation on the voltage, current, temperature, and battery health status value of the energy storage battery to obtain the energy storage battery circuit diagnosis status value.

[0045] As a further solution of the present invention, in step 2, the diagnostic strategy of the brake resistor circuit is:

[0046] If the voltage of the brake resistor is within the safe range, the brake resistor voltage status is normal, and the diagnostic status is 0; if the voltage of the brake resistor is not within the safe range, the brake resistor voltage status is abnormal, and the diagnostic status is 1;

[0047] If the braking current is within the safe range, the braking current state is normal and the diagnostic state is 0; if the braking current is not within the safe range, the braking current state is abnormal and the diagnostic state is 1;

[0048] The health status value of the brake inverter is within the safe range, the health status value of the brake inverter is normal, and the diagnostic status is 0. The health status value of the brake inverter is not within the safe range, the health status value of the brake inverter is abnormal, and the diagnostic status is 1;

[0049] Perform a logical OR operation on the voltage of the brake resistor, the brake current, and the health status value of the brake inverter to obtain the diagnostic status value of the brake resistor circuit.

[0050] Compared with the prior art, the technical effect of the present invention is as follows: the present invention effectively avoids the restriction of the braking inverter failure on the system operation by comprehensively utilizing the braking inverter and the energy storage charging circuit, improves the system reliability and safety, and maximizes the use of available electrical energy, reduces the system energy cost, and reduces carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is an electrical schematic diagram of the present invention;

[0052] Figure 2 It is a schematic diagram of the electrical function of the present invention;

[0053] Figure 3 The flowchart of the method proposed in the present invention is shown in FIG. DETAILED DESCRIPTION

[0054] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solution in the present invention. Obviously, the described technical solution is only a part of the present invention but not all of it. Based on the technical solution in the present invention, all other technical solutions obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0055] like Figure 1 As shown, a braking inverter and energy storage charging circuit cooperative working system proposed by the present invention includes a braking energy recovery unit, a braking inverter and energy storage charging circuit system working control unit, a braking system unit, an energy storage system unit, and a data and instruction processing unit. The braking inverter and energy storage charging circuit system working control unit are connected to the braking energy recovery unit, the braking system unit, the energy storage system unit, and the data and instruction processing unit. The braking inverter and energy storage charging circuit system working control unit includes a multi-position switching switch and a first fuse. The data and instruction processing unit includes a power supply busbar diagnosis collection unit, a battery health diagnosis collection unit, and a braking resistor diagnosis collection unit. The central processing unit is connected to the power supply busbar diagnosis collection unit, the battery health diagnosis collection unit, and the brake resistor diagnosis collection unit. The central processing unit receives data from the data and instruction processing unit, obtains the power supply busbar circuit diagnosis status value, the energy storage battery circuit diagnosis status value, and the brake resistor circuit status diagnosis value through the set diagnosis strategy, and performs diagnosis processing through the preset diagnosis result formula. The result directly controls the multi-bit switch. The result obtained by the preset diagnosis formula is the weighted sum of the power supply busbar circuit diagnosis status value, the energy storage battery circuit diagnosis status value, and the brake resistor circuit status diagnosis value. The preset diagnosis formula is:

[0056] S total =S MB ×α MB +S BMS ×α BMS +S BR ×α BR

[0057] Where: S total is the total diagnostic status value, S MB , S BMS , S BR are the power supply busbar circuit diagnostic status value, energy storage battery circuit diagnostic status value and brake resistor circuit diagnostic status value, respectively. MB , α BMS , α BRare the weights of the power supply busbar circuit diagnostic status value, the energy storage battery circuit diagnostic status value, and the brake resistor circuit diagnostic status value, which are 1, 2, and 4 respectively.

[0058] The present invention utilizes the braking inverter and the energy storage charging circuit in a comprehensive manner, thereby effectively avoiding the restriction of the braking inverter failure on the system operation, improving the system reliability and safety, and making maximum use of the available electric energy, reducing the system energy cost and reducing carbon emissions.

[0059] like Figure 2 As shown, the system proposed in the present invention realizes the coordinated working control of the braking inverter and the energy storage charging circuit through data and instruction processing, and then realizes braking energy recovery, braking system management and energy storage system management according to the corresponding control strategy.

[0060] It should be noted that the braking energy recovery unit includes a three-phase AC motor, a motor frequency converter, a second fuse and a power supply busbar. When the three-phase AC motor is dragged by a heavy object or other equipment, the AC power generated by it is rectified into DC power by the motor frequency converter, and then the DC power is sent to the power supply busbar through the fuse. The three-phase AC motor is connected to the motor frequency converter, which is connected to the power supply busbar through the second fuse. The multi-position switching switch is connected to the power supply busbar through the first fuse. The braking system unit includes a braking resistor inverter and a braking resistor. The braking resistor is connected to the braking resistor inverter, and the braking resistor inverter is connected to the multi-position switching switch.

[0061] It should be noted that the energy storage system unit includes a battery management system and an energy storage battery. The energy storage battery is connected to the battery management system, and the battery management system is connected to both the multi-position switch and the central processing unit.

[0062] It should be noted that the power supply busbar diagnosis collection unit collects the insulation value and voltage of the power supply busbar, and the battery health diagnosis collection unit collects the charging voltage, charging current, resistance, power, temperature, operating time, charge and discharge status, and battery health status value of the energy storage battery. The battery health status value is the reciprocal of the total number of failures, maintenance and replacements of the energy storage battery.

[0063] It should be noted that the brake resistor diagnostic acquisition unit conducts data docking with the brake inverter through the bus communication module. The docking data includes the operating status value, voltage, current, resistance and health status value of the brake inverter. The health status value of the brake inverter is the inverse of the number of failures, maintenance and replacements of the brake inverter. The results obtained by the central processor communicate with the battery management system through the bus communication module.

[0064] like Figure 3As shown, a method for cooperative working of a braking frequency converter and an energy storage charging circuit is applied, and the above-mentioned system for cooperative working of a braking frequency converter and an energy storage charging circuit is applied, and the method comprises the following steps:

[0065] Step 1, raw data collection: collect the data required for power bus diagnosis through the power bus diagnosis collection unit, collect the data required for battery health diagnosis through the battery health diagnosis collection unit, and collect the data required for brake resistor and brake inverter status diagnosis through the brake resistor diagnosis collection unit;

[0066] Step 2, obtaining the diagnostic value of each circuit state: obtaining the power supply busbar circuit diagnostic analysis value, the energy storage battery circuit diagnostic analysis value and the brake resistor circuit diagnostic analysis value respectively according to the preset power supply busbar circuit diagnostic formula, the energy storage battery circuit diagnostic analysis value and the brake resistor circuit diagnostic analysis value, analyzing the fault degree of each circuit by the obtained power supply busbar circuit diagnostic analysis value, the energy storage battery circuit diagnostic analysis value and the brake resistor circuit diagnostic analysis value, and obtaining the power supply busbar circuit diagnostic state value, the energy storage battery circuit diagnostic state value and the brake resistor circuit diagnostic state value according to the preset diagnostic strategy of each circuit;

[0067] Step 3, obtain the total diagnostic status value: obtain the total diagnostic status value according to the preset diagnostic formula, output the diagnostic status type of the power supply bus circuit, the energy storage battery circuit and the brake resistor circuit according to the value of the total diagnostic status value, and control the opening and closing of the power supply bus circuit, the energy storage battery circuit and the brake resistor circuit according to the diagnostic status type and the set execution strategy.

[0068] It should be noted that in step 2, the power supply busbar circuit diagnosis formula is assumed to be:

[0069]

[0070] Where: k MB is the power supply busbar circuit diagnostic analysis value, I MB,safe I is the safety insulation value of the power supply busbar, which is set according to the requirements. MB is the current of the power supply busbar circuit, V MB is the voltage of the power supply busbar circuit, V MB,nom is the rated voltage of the power supply busbar, V MB,max 、V MB,min They are the maximum and minimum values ​​allowed for the voltage of the power supply busbar respectively;

[0071] The preset energy storage battery circuit diagnostic formula is:

[0072]

[0073] Where: k BMS is the diagnostic analysis value of the energy storage battery circuit, V BMSis the energy storage battery circuit voltage, V BMS,nom 、V MB,max 、V MB,min are the rated value, maximum allowable value and minimum allowable value of the energy storage battery circuit voltage, I MB is the energy storage battery circuit current, I BMS,nom ,I MB,max ,I MB,min are the rated value, maximum allowable value, and minimum allowable value of the energy storage battery circuit, respectively. BMS is the temperature of the energy storage battery, T BMS,nom 、T BMS,max 、T BMS,min are the rated value, maximum allowable value and minimum allowable value of the energy storage battery temperature, H BMS is the battery health status value of the energy storage battery, H BMS,safe It is the safety value of the battery health status value of the energy storage battery;

[0074] The preset brake resistor circuit diagnostic formula is:

[0075]

[0076] Where: k BR is the diagnostic analysis value of the brake resistor circuit, V BR is the braking resistor circuit voltage, V BR,nom 、V BR,max 、V BR,min are the rated value, maximum allowable value and minimum allowable value of the braking resistor circuit voltage, I BR is the braking resistor circuit current, I BR,nom ,I BR,max ,I BR,min They are the rated value, maximum allowable value, and minimum allowable value of the braking resistor circuit, H BR is the health status value of the brake inverter, H BR,safe It is the safe value of the health status value of the brake inverter.

[0077] These formulas use normalization of key parameters, so that different physical quantities can be compared on the same scale, ensuring that the abnormal state of each circuit can be accurately diagnosed through a single analysis value, avoiding misjudgment due to parameter differences; each diagnostic formula comprehensively considers multiple key factors such as current, voltage, temperature, and the health status of the system. This multi-dimensional diagnostic strategy can comprehensively evaluate the operating status of the circuit and prevent the abnormality of a single factor from causing system misoperation; by setting key parameters such as safety values, rated values, and allowable ranges, the diagnostic formula can be adjusted according to different application requirements and adapt to various complex operating environments. This flexibility enables the system to maintain stable operation under variable working conditions; the maximum value output by the diagnostic formula can be directly used in the control logic, so that the system can quickly and accurately take corresponding measures when an abnormality is detected. This efficient response mechanism can significantly reduce potential system damage and safety risks; through detailed diagnostic analysis, potential problems of the circuit can be discovered and warned in advance, reducing the failure rate of the system, extending the service life of the equipment, and also reducing maintenance costs.

[0078] On a modern ocean-going cargo ship, the normal operation of the power system is essential to ensure navigation safety and arrive at the destination on time. The ship uses an electrical drive system, which includes a power supply busbar, an energy storage battery system, and a brake resistor system to provide stable energy support under various complex navigation conditions. During ocean voyages, ships will encounter various unforeseen situations, such as sudden failures of electrical equipment or drastic changes in sea conditions. At this time, the power supply busbar in the electrical system will be subject to large voltage fluctuations, the energy storage battery system needs to respond quickly to provide stable power to other systems, and the brake resistor system must also effectively manage the energy generated during the braking process to avoid damage to the ship's electronic equipment. Therefore, ensuring that these circuits are in normal condition during operation and timely discovering and handling potential faults has become a core task of the ship's power management system. The ship encountered a strong storm during the voyage, causing the hull to shake violently and the power system needed to be adjusted frequently. At this time, the ship's electrical system began to show abnormalities. The monitoring system on the ship found that the power supply busbar voltage fluctuated, the energy storage battery system temperature gradually increased, and the current value of the brake resistor system also changed abnormally. In order to ensure navigation safety, the ship's power management system started automatic diagnosis. The system uses the preset power supply busbar circuit diagnostic formula, energy storage battery circuit diagnostic formula and brake resistor circuit diagnostic formula to quickly evaluate the working status of each circuit: the power supply busbar circuit diagnostic formula calculation found that the current of the power supply busbar was lower than the normal value, while the voltage fluctuated greatly. The formula result k MB If the displayed value is close to 1, it indicates that there is an insulation problem or voltage abnormality in the power supply busbar circuit. The energy storage battery circuit diagnostic formula evaluates battery voltage, current, temperature and other parameters. Calculation result kBMS If the displayed temperature rises significantly and the voltage exceeds the normal range, the system will immediately issue an early warning, indicating that the energy storage battery is at risk of overheating and voltage instability. Braking resistor circuit diagnostic formula k BR A high output value indicates that the brake resistor system is at risk of failure. Based on the maximum value calculated by the diagnostic formula, the system immediately took automated response measures: first, the power supply bus voltage was adjusted and switched to the backup power supply bus; second, the energy storage battery load was reduced through control logic and cooling measures were initiated; finally, the operating parameters of the brake resistor system were adjusted to prevent excessive heating. This series of automatic diagnoses and responses ensured that the ship could continue to sail safely in the storm, avoided possible electrical failures, and ensured the safety of the crew and cargo. This scenario clearly demonstrates the key role of these diagnostic formulas in practical applications - through precise analysis and rapid response, the system can continue to operate stably in a complex and changing environment, avoid potential damage, and reduce maintenance costs.

[0079] It should be noted that in step 2, the strategy for power supply bus diagnosis is that if the power supply bus insulation value and the power supply bus voltage are within their respective safety setting ranges, the diagnostic status is 0, otherwise it is 1, and then the diagnostic status of the power supply bus insulation value and the power supply bus voltage is logically ORed to obtain the power supply bus circuit diagnostic status value; the charging voltage, charging current, resistance, power, temperature, operating time, charge and discharge status, and battery health status value of the energy storage battery are within their respective safety setting ranges, and the diagnostic status is 0, otherwise it is 1, and then the diagnostic status of the charging voltage, charging current, resistance, power, temperature, operating time, charge and discharge status, and battery health status value of the energy storage battery is logically ORed to obtain the energy storage battery circuit diagnostic status value; the voltage, braking current, and health status value of the braking resistor are within their respective set safety ranges, and the diagnostic status is 0, otherwise it is 1, and then the diagnostic status of the voltage, braking current, and health status value of the braking inverter are logically ORed to obtain the braking resistor circuit diagnostic status value.

[0080] It should be noted that in step 3, the execution strategy set is:

[0081] S total =0, keep the power supply busbar, energy storage battery and brake resistor circuit powered;

[0082] S total =1, disconnect the power supply busbar circuit, and energize the energy storage battery and brake resistor circuit;

[0083] S total =2, disconnect the energy storage battery circuit, and energize the power supply busbar and brake resistor circuit;

[0084] S total=3, disconnect the power supply busbar and energy storage battery circuit, and energize the brake resistor circuit;

[0085] S total =4, disconnect the braking resistor circuit, and energize the power supply busbar and energy storage battery circuit;

[0086] S total =5, disconnect the power supply busbar and brake resistor circuit, and energize the energy storage battery circuit;

[0087] S total =6, disconnect the energy storage battery and brake resistor circuits, and energize the power busbar;

[0088] S total =7, disconnect the power supply busbar, energy storage battery and brake resistor circuit.

[0089] This strategy allows the system to take targeted response measures when different levels of abnormalities are detected, rather than simply disconnecting all circuits. By gradually disconnecting or keeping different circuits powered on, the operating status of the system can be more accurately controlled, unnecessary shutdowns can be avoided, and the continuity and stability of the system can be maintained to the greatest extent. For example, when only the power busbar is abnormal, it is possible to choose to disconnect only the power busbar circuit while keeping other circuits working, thereby reducing the impact on the overall system. This strategy can effectively isolate the source of the fault. When an abnormality is detected in a circuit, the circuit can be disconnected immediately without affecting other circuits that are working normally. This fault isolation helps prevent the further spread of the problem and reduce the impact of the fault on the entire system, thereby improving the overall reliability of the system. Through the combination of gradual disconnection and keeping powered on, the system can protect itself in a variety of complex situations. When multiple circuits are abnormal at the same time, the circuit with the greatest risk can be disconnected first, and the safer circuit can be kept working to ensure that in the worst case, the system can still maintain basic operating functions and avoid the serious consequences of complete shutdown. By gradually disconnecting, operators or automation systems can more clearly identify the source and type of faults. When only the power bus circuit is disconnected, the system's response can help determine whether the problem is indeed caused by the power bus, rather than other circuits. This step-by-step diagnostic approach helps to quickly locate the fault, thereby speeding up the repair time. This strategy provides strong adaptability for the system's flexible response. According to actual needs and different application scenarios, the system can adjust the execution strategy and select different combinations of disconnection or power-on. This flexibility enables the system to adapt to various complex working environments and ensure that the system can still respond reasonably even under extreme conditions. Through a step-by-step execution strategy, the system can reduce maintenance costs and time losses caused by incorrect disconnection or complete shutdown. Because the circuit is only disconnected when necessary, operators and maintenance personnel can conduct more targeted inspections and repairs, thereby reducing overall maintenance costs and improving system operation efficiency.

[0090] Specifically, in step 2, the strategy for power supply busbar circuit diagnosis is:

[0091] If the power bus insulation value is greater than or equal to the preset power bus safety insulation value, the power bus insulation state is normal and the diagnostic state is 0; if the power bus insulation value is less than the preset power bus safety insulation value, the power bus insulation value is abnormal and the diagnostic state is 1;

[0092] If the power bus voltage is within the set safety range, the power bus voltage status is normal and the diagnostic status is 0; if the power bus voltage is not within the set safety range, the power bus voltage status is abnormal and the diagnostic status is 1;

[0093] Perform a logical OR operation on the insulation and voltage status of the power supply busbar to obtain the power supply busbar circuit diagnosis status value.

[0094] Specifically, in step 2, the diagnostic strategy of the energy storage battery circuit is:

[0095] If the voltage of the energy storage battery is within the safe range, the voltage status of the energy storage battery is normal, and the diagnostic status is 0; if the voltage of the energy storage battery is not within the safe range, the voltage status of the energy storage battery is abnormal, and the diagnostic status is 1;

[0096] If the current of the energy storage battery is within the safe range, the current state of the energy storage battery is normal, and the diagnostic state is 0; if the current of the energy storage battery is not within the safe range, the current state of the energy storage battery is abnormal, and the diagnostic state is 1;

[0097] If the temperature of the energy storage battery is within the safe range, the temperature state of the energy storage battery is normal, and the diagnostic state is 0; if the temperature of the energy storage battery is not within the safe range, the temperature state of the energy storage battery is abnormal, and the diagnostic state is 1;

[0098] If the battery health status value of the energy storage battery is within the safe range, the battery health status value of the energy storage battery is normal, and the diagnostic status is 0, if the battery health status value of the energy storage battery is not within the safe range, the battery health status value of the energy storage battery is abnormal, and the diagnostic status is 1;

[0099] Perform a logical OR operation on the voltage, current, temperature, and battery health status value of the energy storage battery to obtain the energy storage battery circuit diagnosis status value.

[0100] Specifically, in step 2, the diagnostic strategy of the brake resistor circuit is:

[0101] If the voltage of the brake resistor is within the safe range, the brake resistor voltage status is normal, and the diagnostic status is 0; if the voltage of the brake resistor is not within the safe range, the brake resistor voltage status is abnormal, and the diagnostic status is 1;

[0102] If the braking current is within the safe range, the braking current state is normal and the diagnostic state is 0; if the braking current is not within the safe range, the braking current state is abnormal and the diagnostic state is 1;

[0103] The health status value of the brake inverter is within the safe range, the health status value of the brake inverter is normal, and the diagnostic status is 0. The health status value of the brake inverter is not within the safe range, the health status value of the brake inverter is abnormal, and the diagnostic status is 1;

[0104] Perform a logical OR operation on the voltage of the brake resistor, the brake current, and the health status value of the brake inverter to obtain the diagnostic status value of the brake resistor circuit.

[0105] By evaluating the voltage, current, temperature and health status of the energy storage battery and brake resistor circuits one by one and using logical or operations to comprehensively diagnose the status, the system can more accurately determine the overall health of the circuit. This approach ensures that as long as a key parameter exceeds the safe range, the circuit abnormality can be immediately identified, avoiding diagnostic errors caused by misjudgment of a single parameter. This strategy comprehensively considers multiple key parameters in circuit operation instead of relying on a single diagnostic indicator. This comprehensive analysis method enables the system to identify a wider range of potential faults. The voltage, current, temperature and health status of the energy storage battery are all included in the diagnosis range, ensuring that no matter what kind of abnormal situation, it can be discovered in time. Because the system can monitor and diagnose the status of key circuits in real time and respond quickly when an abnormality occurs, the reliability and safety of the overall system are significantly improved. This strategy helps to avoid chain reactions caused by an abnormal circuit, prevent small faults from evolving into major accidents, and thus ensure the stable operation of the system. This diagnostic strategy realizes the self-protection of the system by identifying and isolating abnormal circuits. When an abnormality occurs in the energy storage battery or brake resistor circuit, the system can immediately take disconnection or adjustment measures to prevent the abnormal circuit from causing further damage to other circuits or equipment. This self-protection mechanism ensures that the system can continue to operate with minimal impact when a fault occurs. In complex industrial or shipping environments, operating conditions are often changeable and difficult to predict. By setting the safety range of multiple parameters and diagnosing and adjusting according to the actual situation, the system can flexibly respond to different changes in operating conditions. This adaptability allows the system to remain stable under various extreme conditions and adjust in time to cope with emergencies. The application of logical or operation effectively reduces the possibility of false alarms. Since the system will only mark the circuit as abnormal when one or more parameters are out of the safety range, this avoids unnecessary alarms and interventions caused by slight fluctuations in a single parameter, thereby reducing the risk of misoperation and improving the operational efficiency of the system. When the system detects an abnormality and gives a diagnostic status value, maintenance personnel can quickly locate the source of the fault because the specific cause of the abnormality can be determined by viewing the status of each diagnostic parameter. This refined diagnosis reduces the time for troubleshooting, improves maintenance efficiency, and reduces the maintenance cost of the system.

[0106] Based on the failure rate of the brake inverter and brake resistor cooling system of 3%-5%, this system improves system reliability by 3%-5%. Based on the potential energy recovery of 700KW power once a day for a 2000KW lifting equipment, energy consumption can be reduced by 35% without considering energy conversion losses. Based on the average fuel consumption rate of diesel engines of 210g / KWh, fuel use can be reduced by 0.147 tons. Based on the diesel price of 6,000 yuan / ton, fuel expenditure can be saved by about 882 yuan. Based on the emission factor of diesel engines of 3.15t CO2e / t, carbon emissions can be reduced by 0.46t.

[0107] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0108] Finally: The above description is only the technical solution of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A braking frequency converter and energy storage charging circuit cooperative working system, characterized in that: It includes a braking energy recovery unit, a braking frequency converter and an energy storage charging circuit system working control unit, a braking system unit, an energy storage system unit, and a data and instruction processing unit. The braking frequency converter and the energy storage charging circuit system working control unit are connected to the braking energy recovery unit, the braking system unit, the energy storage system unit, and the data and instruction processing unit. The braking frequency converter and the energy storage charging circuit system working control unit includes a multi-position switching switch and a first fuse. The data and instruction processing unit includes a power supply busbar diagnosis collection unit, a battery health diagnosis collection unit, a braking resistor diagnosis collection unit, and a central processing unit. The central processing unit The device unit is connected to the power supply busbar diagnosis collection unit, the battery health diagnosis collection unit, and the brake resistor diagnosis collection unit. The central processing unit receives data from the data and instruction processing unit, obtains the power supply busbar circuit diagnosis status value, the energy storage battery circuit diagnosis status value, and the brake resistor circuit status diagnosis value through the set diagnosis strategy, and performs diagnosis processing through the preset diagnosis result formula. The obtained result directly controls the multi-bit switch. The result obtained by the preset diagnosis formula is the weighted sum of the power supply busbar circuit diagnosis status value, the energy storage battery circuit diagnosis status value, and the brake resistor circuit status diagnosis value. The preset diagnosis formula is: S total =S MB ×α MB +S BMS ×α BMS +S BR ×α BR Where: S total is the total diagnostic status value, S MB , S BMS , S BR are the power supply busbar circuit diagnostic status value, energy storage battery circuit diagnostic status value and brake resistor circuit diagnostic status value, respectively. MB , α BMS , α BR are the weights of the power supply busbar circuit diagnostic status value, the energy storage battery circuit diagnostic status value, and the brake resistor circuit diagnostic status value, which are 1, 2, and 4 respectively.

2. A braking frequency converter and energy storage charging circuit cooperative working system according to claim 1, characterized in that: The braking energy recovery unit includes a three-phase AC motor, a motor frequency converter, a second fuse and a power supply busbar. The three-phase AC motor is connected to the motor frequency converter, the motor frequency converter is connected to the power supply busbar through the second fuse, the multi-position switching switch is connected to the power supply busbar through the first fuse, and the braking system unit includes a braking resistor frequency converter and a braking resistor. The braking resistor is connected to the braking resistor frequency converter, and the braking resistor frequency converter is connected to the multi-position switching switch.

3. A braking frequency converter and energy storage charging circuit cooperative working system according to claim 2, characterized in that: The energy storage system unit includes a battery management system and an energy storage battery. The energy storage battery is connected to the battery management system, and the battery management system is connected to a multi-position switching switch and a central processing unit.

4. A braking frequency converter and energy storage charging circuit cooperative working system according to claim 3, characterized in that: The power supply busbar diagnosis collection unit collects the insulation value and voltage of the power supply busbar, and the battery health diagnosis collection unit collects the charging voltage, charging current, resistance, power, temperature, operating time, charge and discharge status, and battery health status value of the energy storage battery. The battery health status value is the reciprocal of the total number of energy storage battery failures, maintenance and replacements.

5. A braking frequency converter and energy storage charging circuit cooperative working system according to claim 4, characterized in that: The brake resistor diagnostic acquisition unit connects data with the brake inverter through the bus communication module. The connected data includes the running status value, voltage, current, resistance and health status value of the brake inverter. The health status value of the brake inverter is the inverse of the number of failures, maintenance and replacements of the brake inverter. The results obtained by the central processor communicate with the battery management system through the bus communication module.

6. A method for cooperative working of a braking frequency converter and an energy storage charging circuit, using a system for cooperative working of a braking frequency converter and an energy storage charging circuit as claimed in any one of claims 1 to 5, characterized in that: The steps include: Step 1, raw data collection: collect the data required for power bus diagnosis through the power bus diagnosis collection unit, collect the data required for battery health diagnosis through the battery health diagnosis collection unit, and collect the data required for brake resistor and brake inverter status diagnosis through the brake resistor diagnosis collection unit; Step 2, obtaining the diagnostic value of each circuit state: obtaining the power supply busbar circuit diagnostic analysis value, the energy storage battery circuit diagnostic analysis value and the brake resistor circuit diagnostic analysis value respectively according to the preset power supply busbar circuit diagnostic formula, the energy storage battery circuit diagnostic analysis value and the brake resistor circuit diagnostic analysis value, analyzing the fault degree of each circuit by the obtained power supply busbar circuit diagnostic analysis value, the energy storage battery circuit diagnostic analysis value and the brake resistor circuit diagnostic analysis value, and obtaining the power supply busbar circuit diagnostic state value, the energy storage battery circuit diagnostic state value and the brake resistor circuit diagnostic state value according to the preset diagnostic strategy of each circuit; Step 3, obtain the total diagnostic status value: obtain the total diagnostic status value according to the preset diagnostic formula, output the diagnostic status type of the power supply bus circuit, the energy storage battery circuit and the brake resistor circuit according to the value of the total diagnostic status value, and control the opening and closing of the power supply bus circuit, the energy storage battery circuit and the brake resistor circuit according to the diagnostic status type and the set execution strategy.

7. A method for cooperative working of a braking frequency converter and an energy storage charging circuit according to claim 6, characterized in that: In step 2, the power supply busbar circuit diagnostic formula is assumed to be: Where: k MB is the power supply busbar circuit diagnostic analysis value, I MB,safe I is the safety insulation value of the power supply busbar, which is set according to the requirements. MB is the current of the power supply busbar circuit, V MB is the voltage of the power supply busbar circuit, V MB,nom is the rated voltage of the power supply busbar, V MB,max 、V MB,min They are the maximum and minimum values ​​allowed for the voltage of the power supply busbar respectively; The preset energy storage battery circuit diagnostic formula is: Where: k BMS is the diagnostic analysis value of the energy storage battery circuit, V BMS is the energy storage battery circuit voltage, V BMS,nom 、V MB,max 、V BM,min are the rated value, maximum allowable value and minimum allowable value of the energy storage battery circuit voltage, I MB is the energy storage battery circuit current, I BMS,nom ,I MB,max ,I MB,min are the rated value, maximum allowable value, and minimum allowable value of the energy storage battery circuit, respectively. BMS is the temperature of the energy storage battery, T BMS,nom 、T BMS,max 、T BMS,min are the rated value, maximum allowable value and minimum allowable value of the energy storage battery temperature, H BMS is the battery health status value of the energy storage battery, H BMS,safe It is the safety value of the battery health status value of the energy storage battery; The preset brake resistor circuit diagnostic formula is: Where: k BR is the diagnostic analysis value of the brake resistor circuit, V BR is the braking resistor circuit voltage, V BR,nom 、V BR,max 、V BR,min are the rated value, maximum allowable value and minimum allowable value of the braking resistor circuit voltage, I BR is the braking resistor circuit current, I BR,nom ,I BR,max ,I BR,min They are the rated value, maximum allowable value, and minimum allowable value of the braking resistor circuit, H BR is the health status value of the brake inverter, H BR,safe It is the safe value of the health status value of the brake inverter.

8. A method for cooperative working of a braking frequency converter and an energy storage charging circuit according to claim 7, characterized in that: In step 2, the strategy for power supply bus diagnosis is that if the power supply bus insulation value and the power supply bus voltage are within their respective safety setting ranges, the diagnostic status is 0, otherwise it is 1, and then the diagnostic status of the power supply bus insulation value and the power supply bus voltage is logically ORed to obtain the power supply bus circuit diagnostic status value; the charging voltage, charging current, resistance, power, temperature, operating time, charge and discharge status, and battery health status value of the energy storage battery are within their respective safety setting ranges, and the diagnostic status is 0, otherwise it is 1, and then the diagnostic status of the charging voltage, charging current, resistance, power, temperature, operating time, charge and discharge status, and battery health status value of the energy storage battery is logically ORed to obtain the energy storage battery circuit diagnostic status value; the voltage, braking current, and health status value of the braking resistor are within their respective set safety ranges, and the diagnostic status is 0, otherwise it is 1, and then the diagnostic status of the voltage, braking current, and health status value of the braking inverter are logically ORed to obtain the braking resistor circuit diagnostic status value.

9. A method for cooperative working of a braking frequency converter and an energy storage charging circuit according to claim 6, characterized in that: In step 3, the execution strategy is set as: S total =0, keep the power supply busbar, energy storage battery and brake resistor circuit powered; S total =1, disconnect the power supply busbar circuit, and energize the energy storage battery and brake resistor circuit; S total =2, disconnect the energy storage battery circuit, and energize the power supply busbar and brake resistor circuit; S total =3, disconnect the power supply busbar and energy storage battery circuit, and energize the brake resistor circuit; S total =4, disconnect the braking resistor circuit, and energize the power supply busbar and energy storage battery circuit; S total =5, disconnect the power supply busbar and brake resistor circuit, and energize the energy storage battery circuit; S total =6, disconnect the energy storage battery and brake resistor circuits, and energize the power busbar; S total =7, disconnect the power supply busbar, energy storage battery and brake resistor circuit.

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