Direct-current energy consumption valve section voltage-sharing control method and related equipment

Abstract

The invention belongs to the field of direct-current energy consumption devices, and discloses a direct-current energy consumption valve section voltage-sharing control method and related equipment.The control method comprises the steps that firstly, the difference value between average voltage and the highest voltage value is collected regularly according to a preset period, and then the difference value is compared with a voltage-sharing threshold value; transmitting an IGCT conduction instruction to the sample valve section sub-module corresponding to the highest voltage value according to the compared overvoltage result; finally, an IGCT conduction process is executed according to the IGCT conduction instruction, so that all test sample valve section sub-modules are always kept in a voltage equalizing state; according to the method, the voltage-sharing threshold value and the conduction time can be dynamically adjusted according to the actual effect in the operation process, and the conduction time executed in each subsequent IGCT conduction process is calculated after being corrected according to the previous conduction result, so that the dynamic compensation of the voltage of each sub-module in the operation process is realized; by adopting the method, the problem of unbalanced module voltage in operation can be effectively avoided, and the influence on the test effect caused by overlarge voltage difference before other tests are carried out is prevented.

Description

Technical Field

[0001] The present invention belongs to the field of direct current energy consumption devices, and in particular relates to a direct current energy consumption valve section pressure equalization control method and related equipment. Background Art

[0002] With the development and utilization of wind energy resources, the construction of offshore wind farms is increasing. Using abundant wind resources to transmit electricity to inland load centers through a flexible direct current transmission (VSC-HVDC) system is an effective way to solve the uneven distribution of energy. However, when an AC fault occurs in the receiving power grid, the wind turbine responds slowly, resulting in energy accumulation in the converter valve, causing the DC voltage to rise, which can easily threaten the safety of the system. In order to solve this problem, energy dissipation devices need to be configured to limit the increase in DC voltage. Modular DC energy dissipation devices have outstanding performance in the field of DC energy dissipation due to their simple structure, small footprint and high reliability, and have become a preferred choice.

[0003] In order to ensure the stability and reliability of modular DC energy dissipation devices in actual projects, such devices must pass the equivalent valve section test before leaving the factory. Most test items need to be carried out under the premise that the valve section voltage remains balanced. However, during actual live operation, due to the difference in characteristics between modules, the overall voltage will be unbalanced, and this imbalance changes with the change of voltage level; therefore, there is currently a lack of a voltage equalization control method to keep the valve section voltage balanced, thereby meeting the test requirements of the modular DC energy dissipation equivalent valve section test.

[0004] It can be seen that for the equivalent valve section test of the modular DC energy consumption device, the existing control method usually adopts natural discharge, so there is a lack of suitable voltage equalization control method that can keep all valve section sub-modules in a voltage balance state, thereby ensuring the smooth implementation of the equivalent valve section test. Summary of the invention

[0005] The purpose of the present invention is to provide a DC energy-consuming valve section voltage equalization control method and related equipment to solve the technical problem that, in an equivalent valve section test of a modular DC energy-consuming device, the existing control method cannot keep each valve section sub-module in a voltage-balanced state, thereby failing to ensure the smooth implementation of the equivalent valve section test.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A DC energy-consuming valve section pressure equalization control method, comprising: The difference between the average voltage and the maximum voltage value is collected regularly according to a preset period; Based on the overpressure result after comparing the difference with the pressure-equalizing threshold, an IGCT conduction instruction is transmitted to the test valve section submodule corresponding to the highest voltage value, so as to execute the IGCT conduction process according to the IGCT conduction instruction, so that all the test valve section submodules always maintain a pressure-equalizing state; The conduction time of each IGCT conduction process is obtained based on the last conduction result, and the conduction time of the first IGCT conduction process is obtained based on the highest voltage value and the average voltage corresponding to the first overvoltage result.

[0007] Furthermore, based on the dynamic pressure equalization instruction, the process of periodically collecting the difference between the average voltage and the maximum voltage value is started; wherein, if the current average voltage collected exceeds the preset threshold, a reset instruction is issued; if all the test valve section submodules are in a normal state and maintain the preset delay time, the dynamic pressure equalization instruction is issued.

[0008] Furthermore, the voltage-sharing threshold is obtained based on the average voltage, wherein: When the DC energy-consuming valve section pressure-sharing control system is operating at rated voltage, the specific formula for the pressure-sharing threshold △U is as follows: △U=U0×3%; When the DC energy-consuming valve section pressure-sharing control system is in the minimum voltage operation, the specific formula of the pressure-sharing threshold △U is as follows: △U=U0×2.4%; Where U0 is the average voltage.

[0009] Furthermore, the difference is compared with the pressure-equalizing threshold value, and if the difference is greater than the pressure-equalizing threshold value, an overpressure result is output, so as to output an IGCT conduction instruction to the test valve section submodule corresponding to the highest voltage value according to the overpressure result.

[0010] Furthermore, when the highest voltage values ​​of all the test valve section submodules are the same, an IGCT conduction instruction is output to the test valve section submodule corresponding to the smallest number.

[0011] Furthermore, the first IGCT conduction process is performed during the conduction time T F The specific formula is as follows: T F = C × R × ln(U max / U0) In the formula, C, R, U max and U0 are the capacitance, first resistance, maximum voltage value and average voltage of the test valve section submodule corresponding to the maximum voltage value respectively.

[0012] Furthermore, the conduction time T of each IGCT conduction process is L Based on the last conduction result, the conduction result includes the last conduction time TS , and the new voltage value U recorded by the test valve section submodule corresponding to the highest voltage value after the last IGCT conduction process P , the specific formula is as follows: T L = T S + C × R × ln(U P / U'0); Where U'0 is the average voltage of the test valve section submodule corresponding to the highest voltage value during the IGCT conduction process.

[0013] A DC energy-consuming valve section pressure-equalizing control system, comprising: A data acquisition module, used for regularly collecting the difference between the average voltage and the maximum voltage value according to a preset period; The IGCT conduction module is used to transmit an IGCT conduction instruction to the test valve section submodule corresponding to the highest voltage value based on the overpressure result after comparing the difference value with the pressure-equalizing threshold value, so as to execute the IGCT conduction process according to the IGCT conduction instruction, so that all the test valve section submodules always maintain a pressure-equalizing state; The conduction time of each IGCT conduction process is obtained based on the last conduction result, and the conduction time of the first IGCT conduction process is obtained based on the highest voltage value and the average voltage corresponding to the first overvoltage result.

[0014] A device comprising: Memory for storing computer programs; A processor is used to implement the steps of the above-mentioned DC energy-consuming valve section pressure equalization control method when executing the computer program.

[0015] A computer-readable storage medium stores a computer program, which is used to implement the steps of the above-mentioned direct current energy-consuming valve section pressure equalization control method when executed by a processor.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a voltage-equalizing control method for a DC energy-consuming valve section. The voltage-equalizing control method firstly collects the difference between the average voltage and the highest voltage value regularly according to a preset period, then compares the difference with the voltage-equalizing threshold value, and transmits an IGCT conduction instruction to a test valve section submodule corresponding to the highest voltage value according to the overpressure result after comparison; finally, an IGCT conduction process is executed according to the IGCT conduction instruction, so that all test valve section submodules always maintain a voltage-equalizing state; during operation, the method dynamically adjusts the voltage-equalizing threshold value and the conduction time according to the actual effect, and the conduction time of each subsequent IGCT conduction process is calculated after being corrected by the previous conduction result, thereby realizing dynamic compensation of the voltage of each submodule during operation; the use of the method can effectively avoid the problem of module voltage imbalance during operation, and prevent the influence on the test effect caused by excessive voltage difference before other tests are carried out.

[0017] Preferably, in the present invention, a dynamic pressure-balancing instruction is introduced as a trigger condition for the acquisition process, and a reset instruction is introduced as a countermeasure in abnormal situations, thereby improving the flexibility and reliability of the control system. When the system is in a normal state, pressure-balancing control can be performed in a timely manner; when the system is abnormal, it can be quickly reset to protect the safety of the equipment.

[0018] Preferably, in the present invention, the voltage balancing threshold is dynamically adjusted according to the voltage level of the system operation, so that the voltage balancing control is more accurate and effective. When the rated voltage and the minimum voltage are operated, different voltage balancing threshold formulas are used to adapt to the voltage fluctuation range under different working conditions, so as to reduce the voltage difference between modules and ensure that the minimum voltage is not lower than the energy extraction voltage; avoid the module undervoltage phenomenon when the minimum voltage is operated, and improve the adaptability and stability of the control system.

[0019] Preferably, in the present invention, by comparing the difference with the voltage balancing threshold to determine whether to output the IGCT conduction instruction, a rapid response to the voltage imbalance is achieved. When the difference is greater than the voltage balancing threshold, the IGCT conduction instruction is output in time to adjust the voltage distribution, thereby avoiding the continued existence of voltage imbalance.

[0020] Preferably, in the present invention, when the highest voltage values ​​of multiple test valve section submodules are the same, the submodule with the smallest number is selected to perform IGCT conduction control, thereby ensuring the fairness and consistency of control; this strategy avoids uneven voltage distribution or control confusion caused by selecting different submodules.

[0021] Preferably, in the present invention, the conduction time of the first IGCT conduction process is calculated by a specific formula, thereby achieving precise control of the IGCT conduction process. This method fully considers factors such as the capacitance, resistance, maximum voltage value and average voltage of the test valve section submodule, thereby ensuring the effectiveness and safety of the conduction process.

[0022] Preferably, in the present invention, the conduction time of the next IGCT conduction process is adjusted according to the conduction result of the previous time, thereby realizing dynamic adjustment and optimization of the IGCT conduction process. This strategy fully considers the influence of the previous conduction time and the new voltage value, so that the control system can adjust the voltage distribution more accurately, thereby improving the accuracy and stability of the control. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A topological diagram of a running test loop provided by an embodiment of the present invention; Figure 2 A topological structure diagram of an energy consumption module provided in an embodiment of the present invention; Figure 3 The working state diagram of the energy consumption module provided in the embodiment of the present invention, wherein A is the charging stage; B is the natural discharge stage; C is the energy consumption stage; Figure 4 A flow chart of a DC energy-consuming valve section pressure equalization control method provided by the present invention; Figure 5 A schematic structural diagram of a DC energy-consuming valve section pressure-equalizing control system provided by the present invention. DETAILED DESCRIPTION

[0024] Example 1 As described in the background technology, during the actual live operation process, due to the differences in characteristics between modules, the overall voltage will be unbalanced, and this imbalance will change with the change of voltage level; therefore, there is currently a lack of a voltage equalization control method that allows the valve section to maintain voltage balance, thereby meeting the test requirements of the modular DC energy consumption equivalent valve section test; it can be seen that during the actual live operation process, the voltage equalization effect is poor and there are obvious differences in the voltage equalization effect under different voltage conditions. When operating at the minimum voltage, it is easy to cause module undervoltage due to improper parameter settings; therefore, there is an urgent need to develop a dynamic voltage equalization control strategy to ensure that the voltage of each module can maintain a balanced state under different voltage conditions.

[0025] In order to achieve the above-mentioned purpose, the present invention provides a DC energy-consuming valve section voltage balancing control method, that is, by analyzing the actual needs of the DC energy-consuming valve section test, a dynamic voltage balancing control method of the energy-consuming valve section is proposed; the use of this method can ensure that under different voltage conditions, the voltage of each module can always maintain a balanced state.

[0026] In order to facilitate understanding of the control method provided in this embodiment, the following terms are explained and illustrated: The flexible direct current transmission (VSC-HVDC) system is a new type of direct current transmission mode; the flexible direct current transmission system realizes mutual transmission between two AC networks through converter stations at both ends. Its core component is the voltage source converter (VSC), which uses turn-off devices (such as IGBT, IGCT) and pulse width modulation (PWM) technology to accurately control the voltage amplitude and phase output by the converter station, thereby realizing independent control of active power and reactive power.

[0027] IGCT (Integrated Gate-Commutated Thyristor) is a power semiconductor device used in high voltage and large capacity fields. It combines the advantages of GTO (Gate Turn-Off Thyristor) and IGBT (Insulated Gate Bipolar Transistor) and has high performance and reliability.

[0028] like Figure 1 As shown, this embodiment provides a DC energy-consuming valve section pressure-equalizing control method, which is applied to the energy-consuming valve section topology structure, that is, the running test loop topology; this topology structure includes an adjustable DC power supply and a plurality of groups of test valve section submodules connected in series; wherein, as Figure 2 As shown, the test valve section submodule includes a charging part composed of a capacitor and a diode, a natural discharge part composed of a capacitor, a first resistor and a second resistor, and an energy consumption part composed of a capacitor, a first resistor and an IGCT.

[0029] like Figure 3 As shown, Figure 3 It is the working state diagram of the energy consumption module (also called the test valve section submodule); like Figure 3 As shown in A, charging state: IGCT is not conducting, and the external current charges the capacitor through the diode branch; like Figure 3 As shown in B, the natural discharge state: the IGCT is not turned on, and the capacitor is slowly discharged through the R1 (first resistor) and R2 (second resistor) branches; like Figure 3 As shown in C, the energy consumption state is: IGCT is turned on, and the capacitor is quickly discharged through R1 and the IGCT branch.

[0030] This embodiment also provides the working principle of the energy-consuming valve section test circuit: Another example Figure 1As shown in the figure, the energy-consuming valve section operation test is to test the operating characteristics of the key components of the energy-consuming valve under actual operating conditions in an equivalent manner; the energy-consuming valve section test circuit is mainly composed of a DC power supply and a test valve section; the tested valve section is composed of n test valve section submodules (the number n can be determined according to the test requirements and the maximum voltage of the adjustable DC power supply, generally not more than 6) connected in series, and the test valve section submodules are connected in series and connected to the DC power supply as a whole, and the DC power supply replenishes the electric energy lost in the system during the test.

[0031] In the initial stage of the test, by gradually increasing the output voltage of the adjustable DC power supply, each submodule in the valve section is charged to above its energy extraction voltage; when the control system detects that the average voltage of the module exceeds the preset threshold, it automatically issues a reset command. After a preset delay time and confirming that the status of all submodules is normal, the control system will start the dynamic voltage balancing command. Subsequently, the DC power supply voltage will be further increased to the specified operating voltage, so as to achieve the relatively stable target voltage required for the test; that is, the execution process of the voltage balancing control method provided in this embodiment is entered, which is as follows: Step 1: The control system calculates the average voltage U0 of the energy-consuming module at a preset fixed period (taking 5 milliseconds as an example), and calculates the maximum value of the module voltage U0 in the system max The difference between the voltage U0 and the average voltage U1 is calculated. U1 is compared with the voltage balancing threshold △U. If U1 exceeds the voltage balancing threshold, go to step 2. The calculation formula of the voltage balancing threshold △U is: △U = U0 × 3%; Step 2: For modules that exceed the voltage-sharing threshold, the control system sends an IGCT turn-on command to one of the modules (when multiple modules have the same voltage, the one with the smaller number is selected), so that the module discharges quickly through the IGCT branch. The turn-on time is T F Determined by the following formula: T F = C × R × ln(U max / U0); In the formula, C, R, U max and U0 are the capacitance, first resistance, maximum voltage value and average voltage of the test valve section submodule corresponding to the maximum voltage value respectively.

[0032] It can be seen that the conduction time of the first execution of the IGCT conduction process is determined by the above formula.

[0033] Step 3: After the on command is completed, the control system records the new voltage value U of the module P , and calculate the on-time T required for the next adjustment according to the following formula L : T L = T S+ C × R × ln(U P / U'0); Where U'0 is the average voltage of the test valve section submodule corresponding to the highest voltage value during the IGCT conduction process.

[0034] Here, it should be noted that, except for the on-time corresponding to the first IGCT conduction process, which is calculated according to the theoretical value, the on-time of each subsequent IGCT conduction process is calculated according to the last conduction result, wherein the conduction result includes the last conduction time T S , and the new voltage value U recorded by the test valve section submodule corresponding to the highest voltage value after the last IGCT conduction process P ; and each submodule is a submodule of the same structure, so the theoretical values ​​of capacitance and resistance of each submodule are the same.

[0035] When conducting the minimum voltage operation test, the voltage balancing threshold can be appropriately reduced according to the actual voltage balancing effect to reduce the voltage difference between modules and ensure that the minimum voltage is not lower than the energy extraction voltage; at this time, △U = U0× 2.4%.

[0036] This embodiment provides a DC energy-consuming valve section pressure equalization control method, the key points of which are: First, dynamically adjust the voltage balancing threshold and conduction time: During operation, dynamically adjust the voltage balancing threshold and conduction time according to the actual effect to meet the voltage balancing requirements under different voltage conditions.

[0037] Second, fixed-cycle module voltage detection and sorting: The control system detects module voltages at a fixed cycle and sorts them according to voltage levels, so as to trigger discharge of modules with high voltages.

[0038] Third, the calculation method of the voltage balancing threshold: The voltage balancing threshold is calculated based on 3% of the real-time average voltage. When conducting the minimum voltage operation test, the voltage balancing threshold can be appropriately reduced to 2.4% of the average voltage to avoid module undervoltage.

[0039] Fourth: Dynamic adjustment of on-time: The first on-time is calculated based on the theoretical value, while the subsequent on-time is calculated and corrected based on the result of the previous on-time to adapt to the changing working conditions.

[0040] Example 2 like Figure 4 As shown, this embodiment provides a DC energy-consuming valve section pressure equalization control method, comprising the following steps: Based on the dynamic pressure equalization instruction, the process of regularly collecting the difference between the average voltage and the maximum voltage value is started; wherein, if the current average voltage collected exceeds the preset threshold, a reset instruction is issued; if all the test valve section submodules are in a normal state and maintain the preset delay time, the dynamic pressure equalization instruction is issued.

[0041] Based on the dynamic voltage balancing instruction, the collection process is started: the difference between the average voltage and the maximum voltage value is collected regularly according to the preset period; Based on the overpressure result after comparing the difference with the pressure-equalizing threshold, an IGCT conduction instruction is transmitted to the test valve section submodule corresponding to the highest voltage value, so as to execute the IGCT conduction process according to the IGCT conduction instruction, so that all the test valve section submodules always maintain a pressure-equalizing state; The above voltage balancing threshold is obtained based on the average voltage, where: When the DC energy-consuming valve section pressure-sharing control system is operating at rated voltage, the specific formula for the pressure-sharing threshold △U is as follows: △U=U0×3%; When the DC energy-consuming valve section pressure-sharing control system is in the minimum voltage operation, the specific formula of the pressure-sharing threshold △U is as follows: △U=U0×2.4%; Where U0 is the average voltage.

[0042] The difference is compared with the pressure-equalizing threshold value. If the difference is greater than the pressure-equalizing threshold value, an overpressure result is output, so as to output an IGCT conduction instruction to the test valve section submodule corresponding to the highest voltage value according to the overpressure result.

[0043] When the highest voltage values ​​of all the test valve section submodules are the same, an IGCT conduction instruction is output to the test valve section submodule corresponding to the smallest number.

[0044] The conduction time of each IGCT conduction process is obtained based on the last conduction result, and the conduction time of the first IGCT conduction process is obtained based on the highest voltage value and the average voltage corresponding to the first overvoltage result.

[0045] The first IGCT conduction process is executed during the conduction time T F The specific formula is as follows: T F = C × R × ln(U max / U0) In the formula, C, R, U max and U0 are the capacitance, first resistance, maximum voltage value and average voltage of the test valve section submodule corresponding to the maximum voltage value respectively.

[0046] Each IGCT conduction process is executed for a conduction time T LBased on the last conduction result, the conduction result includes the last conduction time T S , and the new voltage value U recorded by the test valve section submodule corresponding to the highest voltage value after the last IGCT conduction process P , the specific formula is as follows: T L = T S + C × R × ln(U P / U'0); Where U'0 is the average voltage of the test valve section submodule corresponding to the highest voltage value during the IGCT conduction process.

[0047] like Figure 5 As shown, the present embodiment further provides a DC energy-consuming valve section pressure-equalizing control system, comprising: a data acquisition module, for periodically acquiring the difference between the average voltage and the maximum voltage value according to a preset period; an IGCT conduction module, for transmitting an IGCT conduction instruction to the test valve section submodule corresponding to the maximum voltage value based on the overpressure result after comparing the difference with the pressure-equalizing threshold, so as to execute the IGCT conduction process according to the IGCT conduction instruction, so as to realize that all the test valve section submodules always maintain a pressure-equalizing state; wherein, the conduction time of each IGCT conduction process is obtained based on the previous conduction result, and the conduction time of the first IGCT conduction process is obtained based on the maximum voltage value and the average voltage corresponding to the overpressure result obtained for the first time.

[0048] The present invention also provides a device, comprising: a memory for storing a computer program; and a processor for implementing the steps of the DC energy-consuming valve section pressure equalization control method when executing the computer program.

[0049] When the processor executes the computer program, the steps of the above-mentioned DC energy-consuming valve section voltage equalization control are implemented, for example: the difference between the average voltage and the maximum voltage value is regularly collected according to a preset period; based on the overpressure result after comparing the difference with the voltage equalization threshold, an IGCT conduction instruction is transmitted to the test valve section submodule corresponding to the maximum voltage value, so as to execute the IGCT conduction process according to the IGCT conduction instruction, so that all test valve section submodules always maintain a voltage equalization state; wherein, the conduction time of each IGCT conduction process is obtained based on the previous conduction result, and the conduction time of the first IGCT conduction process is obtained based on the maximum voltage value and the average voltage corresponding to the overpressure result obtained for the first time.

[0050] Alternatively, the processor implements the functions of each module in the above-mentioned system when executing the computer program, for example: a data acquisition module, which is used to periodically collect the difference between the average voltage and the maximum voltage value according to a preset period; an IGCT conduction module, which is used to transmit an IGCT conduction instruction to the test valve section submodule corresponding to the maximum voltage value based on the overpressure result after comparing the difference with the equalizing pressure threshold, so as to execute the IGCT conduction process according to the IGCT conduction instruction, so that all test valve section submodules always maintain an equalizing pressure state; wherein, the conduction time of each execution of the IGCT conduction process is obtained based on the previous conduction result, and the conduction time of the first execution of the IGCT conduction process is obtained based on the maximum voltage value and the average voltage corresponding to the overpressure result obtained for the first time.

[0051] Exemplarily, the computer program can be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units can be a series of computer program instruction segments that can complete the preset functions, and the instruction segments are used to describe the execution process of the computer program in the DC energy-consuming valve section pressure-equalizing control device. For example, the computer program can be divided into a data acquisition module and an IGCT conduction module; the specific functions of each module are as follows: a data acquisition module, which is used to regularly collect the difference between the average voltage and the highest voltage value according to a preset period; an IGCT conduction module, which is used to transmit an IGCT conduction instruction to the test valve section submodule corresponding to the highest voltage value based on the overpressure result after comparing the difference with the pressure-equalizing threshold, so as to execute the IGCT conduction process according to the IGCT conduction instruction, so as to realize that all test valve section submodules always maintain a pressure-equalizing state; wherein, the conduction time of each IGCT conduction process is obtained based on the last conduction result, and the conduction time of the first IGCT conduction process is obtained based on the highest voltage value and the average voltage corresponding to the first overpressure result.

[0052] The DC energy-consuming valve section pressure-equalizing control device may be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The DC energy-consuming valve section pressure-equalizing control device may include, but is not limited to, a processor and a memory. Those skilled in the art may understand that the above is an example of a DC energy-consuming valve section pressure-equalizing control device and does not constitute a limitation on the DC energy-consuming valve section pressure-equalizing control device. It may include more components than the above, or a combination of certain components, or different components. For example, the DC energy-consuming valve section pressure-equalizing control device may also include input and output devices, network access devices, buses, etc.

[0053] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The processor is the control center of the DC energy-consuming valve section pressure-balancing control, and uses various interfaces and lines to connect various parts of the entire DC energy-consuming valve section pressure-balancing control device.

[0054] The memory can be used to store the computer program and / or module, and the processor implements various functions of the DC energy-consuming valve section equalizing pressure control device by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory.

[0055] The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0056] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the direct current energy-consuming valve section pressure equalization control method are implemented.

[0057] If the module / unit integrated in the DC energy-consuming valve section pressure-equalizing control system is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0058] Based on such understanding, the present invention implements all or part of the processes in the above-mentioned DC energy-consuming valve section pressure-equalizing control method, and can also be completed by instructing related hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above-mentioned DC energy-consuming valve section pressure-equalizing control method can be implemented. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or preset intermediate form, etc.

[0059] The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0060] It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media do not include electrical carrier signals and telecommunication signals.

[0061] It can be seen that the present invention provides a DC energy-consuming valve section pressure equalization control method, which has the following advantages over the existing control methods: During operation, this method dynamically adjusts the voltage-equalizing threshold and the conduction time according to the actual effect, and the conduction time of each subsequent IGCT conduction process is calculated after correction through the previous conduction result, thereby achieving dynamic compensation of the voltage of each submodule during operation; this method can effectively avoid the problem of unbalanced module voltage during operation, and prevent the impact on the test effect caused by excessive voltage differences before other tests are carried out; and ensure the smooth implementation of the equivalent valve section test.

[0062] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A DC energy-consuming valve section pressure equalization control method, characterized in that: include: The difference between the average voltage and the maximum voltage value is collected regularly according to a preset period; Based on the overpressure result after comparing the difference with the pressure-equalizing threshold, an IGCT conduction instruction is transmitted to the test valve section submodule corresponding to the highest voltage value, so as to execute the IGCT conduction process according to the IGCT conduction instruction, so that all the test valve section submodules always maintain a pressure-equalizing state; The conduction time of each IGCT conduction process is obtained based on the last conduction result, and the conduction time of the first IGCT conduction process is obtained based on the highest voltage value and the average voltage corresponding to the first overvoltage result.

2. The DC energy-consuming valve section pressure equalization control method according to claim 1 is characterized in that: Based on the dynamic pressure equalization instruction, the process of regularly collecting the difference between the average voltage and the maximum voltage value is started; wherein, if the current average voltage collected exceeds the preset threshold, a reset instruction is issued; if all the test valve section submodules are in a normal state and maintain the preset delay time, the dynamic pressure equalization instruction is issued.

3. The DC energy-consuming valve section pressure equalization control method according to claim 1, characterized in that: The voltage-sharing threshold is obtained based on the average voltage, where: When the DC energy-consuming valve section pressure-sharing control system is operating at rated voltage, the specific formula for the pressure-sharing threshold △U is as follows: △U=U0×3%; When the DC energy-consuming valve section pressure-sharing control system is in the minimum voltage operation, the specific formula of the pressure-sharing threshold △U is as follows: △U=U0×2.4%; Where U0 is the average voltage.

4. The DC energy-consuming valve section pressure equalization control method according to claim 1, characterized in that: The difference is compared with the pressure-equalizing threshold value. If the difference is greater than the pressure-equalizing threshold value, an overpressure result is output, so as to output an IGCT conduction instruction to the test valve section submodule corresponding to the highest voltage value according to the overpressure result.

5. The DC energy-consuming valve section pressure equalization control method according to claim 4, characterized in that: When the highest voltage values ​​of all the test valve section submodules are the same, an IGCT conduction instruction is output to the test valve section submodule corresponding to the smallest number.

6. The DC energy-consuming valve section pressure equalization control method according to claim 1, characterized in that: The first IGCT conduction process is executed during the conduction time T F The specific formula is as follows: T F = C × R × ln(U max / U0) In the formula, C, R, U max and U0 are the capacitance, first resistance, maximum voltage value and average voltage of the test valve section submodule corresponding to the maximum voltage value respectively.

7. The DC energy-consuming valve section pressure equalization control method according to claim 6, characterized in that: Each IGCT conduction process is executed for a conduction time T L Based on the last conduction result, the conduction result includes the last conduction time T S , and the new voltage value U recorded by the test valve section submodule corresponding to the highest voltage value after the last IGCT conduction process P , the specific formula is as follows: T L = T S + C × R × ln(U P / U'0); Where U'0 is the average voltage of the test valve section submodule corresponding to the highest voltage value during the IGCT conduction process.

8. A DC energy-consuming valve section pressure-equalizing control system, characterized in that: include: A data acquisition module, used for regularly collecting the difference between the average voltage and the maximum voltage value according to a preset period; The IGCT conduction module is used to transmit an IGCT conduction instruction to the test valve section submodule corresponding to the highest voltage value based on the overpressure result after comparing the difference value with the pressure-equalizing threshold value, so as to execute the IGCT conduction process according to the IGCT conduction instruction, so that all the test valve section submodules always maintain a pressure-equalizing state; The conduction time of each IGCT conduction process is obtained based on the last conduction result, and the conduction time of the first IGCT conduction process is obtained based on the highest voltage value and the average voltage corresponding to the first overvoltage result.

9. A device, characterized in that: include: Memory for storing computer programs; A processor is used to implement the steps of the DC energy-consuming valve section pressure equalization control method according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, it is used to implement the steps of the DC energy-consuming valve section pressure equalization control method according to any one of claims 1 to 7.

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