A modular distributed resistance energy dissipation device, control method and storage medium

Abstract

The present application belongs to the technical field of offshore wind power direct current transmission, and in particular, relates to a modular distributed resistance energy dissipation device, a control method and a storage medium. The present device is composed of N energy dissipation submodules in cascade, and each energy dissipation submodule includes: a mechanical switch MS, an anti-reverse connection diode D1, an auxiliary circuit and an energy dissipation control circuit. The present disclosure considers the boosting effect of the pre-auxiliary circuit on the DC capacitor voltage, and adjusts the DC voltage applied to both ends of the energy dissipation resistor in the submodule. After the auxiliary duty cycle consistent with the required energy consumption power is obtained by calculation, it is sent to the pre-auxiliary circuit, and a corresponding pulse signal is generated. Through the participation of the auxiliary duty cycle, the step values ​​of the original step power of the energy dissipation device become continuous, thereby improving the continuity of the adjustable power of the energy dissipation device and optimizing the control effect of the offshore wind power direct current transmission system FRT.

Description

Technical Field

[0001] The present application belongs to the technical field of offshore wind power direct current transmission, and in particular, relates to a modular distributed resistance energy dissipation device, a control method and a storage medium. Background Art

[0002] At present, with the gradual depletion of fossil energy and people's increasing attention to ecological and environmental protection, wind energy, as a representative of renewable energy and clean energy, especially the development and utilization of offshore wind energy, has gradually received more attention. In the selection of offshore wind power transmission methods, DC lines have gradually become an important networking method due to their advantages such as no capacitive reactance and inductive reactance and low cost of long-distance transmission. In the DC transmission system of offshore wind power, how to effectively realize the fault ride-through (Fault-Ride-Through, FRT) of the entire system when the receiving end power grid fails has always been an important engineering and technical issue, and the DC energy consumption device is an important physical device to realize the FRT of the offshore wind power DC transmission system.

[0003] The DC energy dissipation devices that have been proposed can be mainly divided into three categories according to the main circuit structure: switch device series valve energy dissipation circuit, modular distributed resistance energy dissipation circuit and modular multilevel converter (MMC) type concentrated resistance energy dissipation circuit. However, there are a large number of switch devices in series in the switch device series valve energy dissipation circuit. The dynamic voltage balancing of the switch devices is a great challenge in practical application and is very difficult to achieve. At the same time, due to the use of a two-level chopping method, the voltage change rate (hereinafter expressed as dv / dt) and current change rate (hereinafter expressed as di / dt) of the device are very high, which affects the fault ride-through performance. Although the MMC type concentrated resistance energy dissipation circuit avoids the concentrated series connection of a large number of switches, the excessive use of the chain full bridge increases the cost of the energy dissipation device, which is not conducive to the economy of system construction. Summary of the invention

[0004] The present disclosure aims to solve the above-mentioned technical problems to at least a certain extent, based on the inventor's discovery and understanding of the following facts and problems: although the modular distributed resistance energy dissipation circuit has become the preferred solution for energy dissipation devices in actual engineering applications, and equipment manufacturers have applied it in wind farms in the North Sea of ​​Europe, in traditional modular distributed resistance energy dissipation circuits, since there is no circuit in the sub-module that actively adjusts the capacitor voltage, the energy consumption power control of the energy dissipation device is discontinuous and the energy consumption power can only be controlled in a step-by-step manner, otherwise power tracking errors will occur, affecting the overall control effect of the offshore wind power DC transmission system FRT.

[0005] In view of this, the present disclosure proposes a modular distributed resistance energy dissipation device, a control method and a storage medium to solve the related problems in the modification technology.

[0006] According to the first aspect of the present disclosure, a modular distributed resistance energy dissipation device is proposed, which is formed by cascading N energy dissipation submodules, each of which includes:

[0007] a mechanical switch MS for preventing a bypass faulty energy consuming submodule from adversely affecting the operation of the energy consuming device;

[0008] An anti-reverse connection diode D1 is used to prevent current shock when the polarity of the submodule is reversed;

[0009] an auxiliary circuit for adjusting the capacitor voltage in the energy consuming submodule to ensure the continuous adjustability of the output power of the energy consuming device; and

[0010] An energy consumption control circuit is used to monitor the energy consumption power reference value of the modular distributed resistance energy consumption device.

[0011] Optionally, in the energy consumption submodule, one end of the mechanical switch MS, the cathode of the first diode D1 and the auxiliary inductor L aux The other end of the mechanical switch MS, the anode of the first diode D1 and the first unidirectional power electronic switch S aux The emitters are connected to each other to form the second terminal T2 of the energy consumption submodule; the auxiliary inductor L aux The other end, the first unidirectional power electronic switch S aux The collector, the anode of the second diode D2, the collector of the second unidirectional power electronic switch S and the positive electrode of the DC capacitor C are connected to each other; the first unidirectional power electronic switch S aux The emitter, the negative electrode of the DC capacitor C and the negative electrode of the energy-consuming resistor are connected to each other; the emitter of the second unidirectional power electronic switch S and the positive electrode of the energy-consuming resistor are connected to each other.

[0012] According to a second aspect of the present disclosure, a control method for a modular distributed resistance energy dissipation device is provided, comprising:

[0013] (1) Construct a modular distributed resistance energy dissipation device;

[0014] (2) According to the energy consumption power required by the DC system after a fault occurs on the AC side of the receiving end of the energy DC transmission system and the capacitor voltage value of the energy consumption submodule under the unassisted duty cycle, the number of submodules N of the modular distributed resistance energy consumption device to be put into use is calculated. rel :

[0015]

[0016] Where P in_G P represents the DC side input power of the grid-side converter station of the offshore wind power DC transmission system, out_G is the AC side output power of the grid-side converter station of the offshore wind power DC transmission system, P N is the maximum transmission power of the DC energy dissipation device, and N is the total number of energy dissipation submodules in the modular distributed resistance energy dissipation device;

[0017] (3) According to the preset number of input submodules N calculated in step (2) rel_M , the energy consumption of the DC system after a fault occurs on the AC side of the receiving end of the offshore wind power DC transmission system (P in_G -P out_G ), DC line voltage value V DC , calculate the auxiliary duty cycle D aux :

[0018]

[0019] Wherein, R is the energy dissipation resistance value of each submodule in the modular distributed resistance energy dissipation device;

[0020] (4) According to the calculation results of step (2) and step (3), a first unidirectional power electronic switch S is generated respectively. aux and the trigger pulse of the second unidirectional power electronic switch S, so as to realize the continuous adjustment of the output power of the modular distributed resistance energy dissipation device.

[0021] According to a third aspect of the present disclosure, an electronic device is provided, comprising:

[0022] A memory for storing computer executable instructions;

[0023] A processor is configured to execute the control method of the modular distributed resistance energy dissipation device disclosed in the present invention.

[0024] According to a fourth aspect of the present disclosure, a computer-readable storage medium is proposed, on which a computer program is stored, and the computer program is used to enable the computer to execute the control method of the modular distributed resistance energy dissipation device of the present disclosure.

[0025] According to the embodiments of the present disclosure, the modular distributed resistance energy dissipation device of the present disclosure takes into account the boosting effect of the front auxiliary circuit on the DC capacitor voltage, and adjusts the DC voltage applied to both ends of the energy dissipation resistor in the submodule. After the auxiliary duty cycle consistent with the required energy consumption power is obtained by calculation, it is sent to the front auxiliary circuit and a corresponding pulse signal is generated. Through the participation of the auxiliary duty cycle, the step values ​​of the original step power of the energy dissipation device become continuous, thereby improving the continuity of the adjustable power of the energy dissipation device and optimizing the control effect of the offshore wind power DC transmission system FRT.

[0026] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic structural diagram of a modular distributed resistance energy dissipation device according to an embodiment of the present disclosure.

[0029] Figure 2 It is a schematic diagram of a control system of a modular distributed resistance energy dissipation device according to an embodiment of the present disclosure.

[0030] Figure 3 It is a schematic diagram of the structure of a traditional modular distributed resistance energy dissipation device, wherein (a) is the structure of the modular distributed resistance energy dissipation device, and (b) is a schematic diagram of the control system of the modular distributed resistance energy dissipation device.

[0031] Figure 4 It is a schematic diagram of the simulation of power tracking error of a traditional modular distributed resistance energy dissipation device. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] Figure 1 It is a schematic structural diagram of a modular distributed resistance energy dissipation device according to an embodiment of the present disclosure.

[0034] like Figure 1 As shown, the modular distributed resistance energy dissipation device is formed by cascading N energy dissipation submodules, wherein each energy dissipation submodule includes:

[0035] a mechanical switch MS for preventing a bypass faulty energy consuming submodule from adversely affecting the operation of the energy consuming device;

[0036] An anti-reverse connection diode D1 is used to prevent current shock when the polarity of the submodule is reversed;

[0037] an auxiliary circuit for adjusting the capacitor voltage in the energy consuming submodule to ensure the continuous adjustability of the output power of the energy consuming device; and

[0038] An energy consumption control circuit is used to monitor the energy consumption power reference value of the modular distributed resistance energy consumption device.

[0039] In one embodiment, in the energy dissipation submodule of the modular distributed resistance energy dissipation device, the circuit is as follows: Figure 1 As shown, the mechanical switch MS, the first diode D1, the auxiliary inductor L aux , the first unidirectional power electronic switch S aux , a second diode D2, a DC capacitor C, a second unidirectional power electronic switch S, and an energy-consuming resistor R; one end of the mechanical switch MS, the cathode of the first diode D1 and the auxiliary inductor L aux The other end of the mechanical switch MS, the anode of the first diode D1 and the first unidirectional power electronic switch S aux The emitters are connected to each other to form the second terminal T2 of the energy consumption submodule; the auxiliary inductor L aux The other end, the first unidirectional power electronic switch S aux The collector, the anode of the second diode D2, the collector of the second unidirectional power electronic switch S and the positive electrode of the DC capacitor C are connected to each other; the first unidirectional power electronic switch S aux The emitter, the negative electrode of the DC capacitor C and the negative electrode of the energy-consuming resistor are connected to each other; the emitter of the second unidirectional power electronic switch S and the positive electrode of the energy-consuming resistor are connected to each other.

[0040] The modular distributed resistance energy dissipation device of the disclosed embodiment calculates the influence of the capacitor voltage fluctuation of the power unit on the output voltage of the bridge arm according to the reactive current outputted by the current chain static VAR generator, performs correction calculation on the modulation ratio of the chain static VAR generator, obtains the ripple effect correction modulation ratio according to the influence of the capacitor voltage fluctuation on the output voltage of the bridge arm, and then performs pulse width modulation control. The disclosed embodiment calculates the actual number of preset input submodules according to the set value of the current required energy consumption power, modifies the number of input submodules and calculates the auxiliary duty cycle, and starts each submodule of the chain structure according to the modified number of input submodules and the auxiliary duty cycle, and eliminates the energy consumption power tracking error through the voltage regulation function of the auxiliary circuit.

[0041] Corresponding to the above-mentioned modular distributed resistance energy dissipation device, the present disclosure also proposes a control method for the modular distributed resistance energy dissipation device, which includes five parts: reference power setting link, input submodule calculation link, auxiliary duty cycle calculation link, capacitor voltage balance control and trigger pulse generation link. Among them, the input submodule calculation link mainly determines the input and output of the second unidirectional power electronic switch S, and the auxiliary duty cycle calculation link mainly determines the first unidirectional power electronic switch S aux input and cut out.

[0042] The control method of the modular distributed resistance energy dissipation device in the embodiment of the present disclosure, wherein the control system schematic diagram of the modular distributed resistance energy dissipation device involved is as follows Figure 2 As shown, the control method includes the following steps:

[0043] (1) Construct a Figure 1 The modular distributed resistance energy dissipation device shown;

[0044] (2) According to the energy consumption power required by the DC system after a fault occurs on the AC side of the receiving end of the energy DC transmission system and the capacitor voltage value of the energy consumption submodule under the unassisted duty cycle, the number of submodules N of the modular distributed resistance energy consumption device to be put into use is calculated. rel :

[0045]

[0046] Where P in_G P represents the DC side input power of the grid-side converter station of the offshore wind power DC transmission system, out_G is the AC side output power of the grid-side converter station of the offshore wind power DC transmission system, P N is the maximum transmission power of the DC energy dissipation device, and N is the total number of energy dissipation submodules in the modular distributed resistance energy dissipation device;

[0047] (3) According to the preset number of input submodules N calculated in step (2) rel_M , the energy consumption of the DC system after a fault occurs on the AC side of the receiving end of the offshore wind power DC transmission system (P in_G -P out_G ), DC line voltage value V DC , calculate the auxiliary duty cycle D aux :

[0048]

[0049] Wherein, R is the energy dissipation resistance value of each submodule in the modular distributed resistance energy dissipation device designed by the energy DC transmission system designer;

[0050] (4) According to the calculation results of steps (2) and (3), Figure 1The modular distributed resistance energy dissipation device control system generates a first unidirectional power electronic switch S aux and the trigger pulse of the second unidirectional power electronic switch S, so as to realize the continuous adjustment of the output power of the modular distributed resistance energy dissipation device.

[0051] The following is a detailed description of a modular distributed resistance energy dissipation device according to an embodiment of the present disclosure, and its specific topology and control process, with reference to the accompanying drawings. Figure 1 and Figure 2 shown.

[0052] (1) A modular distributed resistance energy dissipation device based on a DC capacitor front auxiliary circuit is composed of N identical sub-modules connected in cascade, and the structure of each sub-module is as follows: Figure 1 Compared to Figure 3 The sub-module structure of the traditional modular distributed resistance energy dissipation device, the auxiliary inductor L placed in front of the DC capacitor aux With auxiliary switch S aux The auxiliary circuit is the key to realize the continuous regulation of energy consumption power in the present invention.

[0053] (2) The control process of the modular distributed resistance energy dissipation device based on the DC capacitor pre-auxiliary circuit is as follows Figure 1 First, the actual energy consumption power required is calculated based on the input and output power difference of the offshore wind power DC transmission system; then the number of submodules put into operation and the auxiliary duty cycle are calculated based on the actual energy consumption power, and finally a trigger pulse is generated based on the output of the capacitor voltage balance algorithm.

[0054] Specifically, the working principle and advantages of the present invention are described in detail below in conjunction with the accompanying drawings:

[0055] like Figure 3 As shown in the figure, the topological structure and control block diagram of the traditional modular distributed resistance energy dissipation device are given. Among them, the mechanical switch MS is set to bypass the faulty submodule, and the diode D1 is mainly used to prevent the submodule from being reversely connected and causing the capacitor to be damaged by reverse pressure. Under normal circumstances, no current flows through D1; the diode D2 limits the discharge loop to the energy dissipation resistance branch of the submodule, ensuring that only forward current passes through the submodule and that the capacitor charging process proceeds smoothly to balance the capacitor voltage. The switch S controls whether the energy dissipation resistance is turned on or off.

[0056] For each submodule of the traditional modular distributed resistance energy dissipation device, when the power electronic switch S in the submodule receives the switch pulse signal and turns on, the capacitor C provides current to the resistor, and the energy dissipation resistor R iActive power is consumed, and the capacitor voltage on capacitor C decreases; when the power electronic switch S is turned off, the outside world will charge capacitor C through diode D2, and the capacitor voltage rises to the equilibrium voltage. At this time, the submodule does not consume active power. Specifically, the overall operating principle of the traditional modular distributed resistance energy dissipation device is as follows:

[0057] When a fault occurs in the AC grid at the receiving end of the offshore wind power system, the power surplus in the flexible DC transmission system will cause energy accumulation in the converter station, raising the DC voltage. When the DC voltage is higher than the threshold value, in order to prevent the protection from being triggered, the modular distributed resistance energy dissipation device enters the input state, and calculates the corresponding dissipated power reference value according to the degree of power surplus, and puts in a corresponding number of sub-modules to consume the surplus power, so that the DC voltage is reduced; at the same time, similar to the IGBT series valve concentrated resistance energy dissipation device, when the DC voltage drops below the threshold value, the modular distributed resistance energy dissipation device enters the cut-out state.

[0058] Based on the above operating principle, the control system block diagram of the modular distributed resistance energy dissipation device is as follows: Figure 2 As shown in the figure, (a) is the structure of the modular distributed resistance energy dissipation device, and (b) is the schematic diagram of the control system of the modular distributed resistance energy dissipation device. After the energy dissipation device enters the input state, according to the different DC side power differences, there should be N SM (1≤N SM ≤N) modules put into operation:

[0059]

[0060] Where P in_G P represents the DC side input power of the grid-side converter station of the offshore wind power DC transmission system, out_G The AC side output power, P N is the maximum transmission power of the DC energy consumption device. SM The value must be the nearest integer greater than this value.

[0061] It should be noted that the control system of the traditional modular distributed resistance energy dissipation device includes a capacitor voltage equalization control link. This is because when the DC bus voltage is not higher than the threshold voltage, all sub-modules should be in an inactive state, the IGBT switch is turned off, and the resistance power is 0 to prevent interference with the normal operation of the flexible DC transmission system. In this case, N sub-modules are equivalent to N capacitors of equal value connected to the DC grid, and the voltage of each capacitor is U dc / N. When the DC voltage rises, each capacitor can only be charged through diode D2, and the voltage rises accordingly. The capacitors in the turned-on submodules are discharged, and R iThe corresponding capacitor voltage consumes active power, and the capacitor in the non-conducting submodule is in a charging state. This will cause the capacitor voltages of each submodule to no longer be equal, resulting in an unbalanced amount. Therefore, the above analysis shows that capacitor voltage balance control is an indispensable link in the traditional modular distributed resistance energy dissipation device, and its specific implementation method is as follows:

[0062] First, the submodule capacitor voltage sampling value U Ci Sort them from high to low; then, when the submodules need to be put into operation, the submodules with high capacitor voltage are selected in order from high to low. Since the system charges the submodules when they are not put into operation, the capacitor voltage increases; during the operation of the submodules, the resistors consume the energy stored in the capacitors, causing the capacitor voltage to drop; thus, based on the above balancing method, the modular distributed resistance energy dissipation device can maintain the balance of DC capacitor voltages between different submodules.

[0063] The above control can complete the control of the traditional modular distributed resistance energy dissipation device. However, from the above analysis, it can be seen that since the sub-module does not contain a capacitor voltage regulation link, and the sub-modules put into use can only be integers, the energy consumption power of the traditional modular distributed resistance energy dissipation device can only be 0, (1 / N)P N , (2 / N)P N ,…(N)P N That is to say, the energy consumption power of the traditional modular distributed resistance energy dissipation device is step-by-step and cannot be adjusted continuously, so in practical applications, tracking errors of the energy consumption power will occur.

[0064] like Figure 4 The figure shows a simulation example of the power dissipation tracking error of a traditional modular distributed resistance energy dissipation device. Assume that the traditional modular distributed resistance energy dissipation device uses 10 submodules in the simulation, and the energy consumption power of each submodule is 250MW. At 0.8s, the reference energy consumption power of the energy dissipation device becomes 1700MW, but it can be seen from the simulation that the actual power dissipation power of the energy dissipation device is 1500MW. This is because the power dissipation of each submodule is 250MW, so the number of submodules put into use after calculation of 1700MW is 6.8, which is not an integer, so the system will default to rounding to 6, so the actual energy consumption power is 1500MW, resulting in an energy consumption power tracking error.

[0065] In order to solve the problem of non-continuous adjustment of power dissipation of traditional modular distributed resistance energy dissipation devices, the present disclosure realizes continuous adjustment of energy dissipation power through reasonable control based on the proposed new modular distributed resistance energy dissipation device, and the specific principle is as follows.

[0066] exist Figure 1In the above, it is assumed that the capacitor voltages of each submodule of the modular distributed resistance energy dissipation device based on the DC capacitor pre-auxiliary circuit are equal and both are V C , then the submodule output voltage V SM With V C The relationship can be derived as follows.

[0067] In one cycle, assuming the auxiliary duty cycle is D aux , then the auxiliary switch S aux On time D aux T (T is the auxiliary switch S aux During the switching cycle), add the auxiliary inductor L aux The voltage on the SM ; In the auxiliary switch S aux The off time (1-D aux )T, add auxiliary inductor L aux The voltage on the SM -V C Since the average current flowing through the auxiliary inductor should be 0 in one cycle,

[0068]

[0069] Right now:

[0070] V SM =V C (1-D aux ) (3)

[0071] When each submodule adopts the same auxiliary modulation ratio, the output voltage of each submodule is equal, so:

[0072]

[0073] Where V DC It is the DC voltage value of the positive and negative lines of the offshore wind power DC transmission system.

[0074] Based on (3) and (4), we know that V C The relationship with DC voltage is:

[0075]

[0076] Based on formula (5), it can be seen that when the DC voltage is constant, the capacitor voltage is only related to the auxiliary duty cycle, and when the auxiliary duty cycle is 0, the capacitor voltage is equal to 1 / N of the DC voltage.

[0077] In the new modular distributed resistance energy dissipation device, after determining the reference power, the actual number of sub-modules N to be put into use should be determined first. rel :

[0078]

[0079] Then, for N rel Round down to get the modified number of submodules N rel_M :

[0080] N rel_M = int[N rel ] (7)

[0081] Where int[] is the floor function.

[0082] Based on the relationship between capacitor voltage and power, when the number of submodules is N rel_M To achieve accurate tracking of energy consumption, the capacitor voltage should be calculated as:

[0083]

[0084] Wherein, R is the energy dissipation resistance value of each submodule in the modular distributed resistance energy dissipation device based on the DC capacitor pre-auxiliary circuit.

[0085] Combining equation (5) and equation (8), we can know that the auxiliary duty cycle can be calculated as:

[0086]

[0087] In other words, according to the number of sub-modules and the auxiliary duty cycle calculated in equations (7) and (9), the continuous and precise regulation of the energy consumption power of the modular distributed resistance energy dissipation device based on the DC capacitor pre-auxiliary circuit can be achieved, thereby improving the control effect of the offshore wind power DC transmission system FRT.

[0088] The modular distributed resistance energy dissipation device disclosed in the present invention can realize accurate and continuous control of the energy dissipation power of the energy dissipation device according to the set value of the currently required energy dissipation power by modifying the number of sub-modules put into use and controlling the auxiliary circuit without generating tracking errors. Therefore, through the present invention, the distributed resistance energy dissipation device not only has a high degree of modularization, but also can achieve the effect of continuous regulation of energy dissipation power, avoiding the adverse effects brought about by step-type power regulation.

[0089] The embodiment of the present disclosure further provides an electronic device, including:

[0090] A memory for storing computer executable instructions;

[0091] A processor is configured to execute the control method of the modular distributed resistance energy dissipation device according to an embodiment of the present disclosure.

[0092] An embodiment of the present disclosure further proposes a computer-readable storage medium on which a computer program is stored, wherein the computer program is used to enable the computer to execute the control method of the modular distributed resistance energy dissipation device of an embodiment of the present disclosure.

[0093] It should be noted that the computer-readable medium mentioned above in the present disclosure may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by an instruction execution system, device or device or used in combination with it. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate or transmit a program for use by an instruction execution system, device or device or used in combination with it. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0094] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0095] The above-mentioned computer-readable medium carries one or more programs. When the above-mentioned one or more programs are executed by the electronic device, the electronic device: receives a request from a first user to configure boot information for the access party software; provides a configuration page for the first user according to the request; obtains the display conditions and display location information set by the first user for the boot information on the configuration page; saves the display conditions and display location information of the boot information in the boot configuration system; and when it is monitored that the operation of the access party software meets the display conditions, controls the access party software to display the boot information according to the display location information.

[0096] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0097] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or otherwise processing in a suitable manner if necessary, and then stored in a computer memory.

[0098] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0099] A person of ordinary skill in the art may understand that all or part of the steps of the method for implementing the above-mentioned embodiment may be completed by instructing the relevant hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one of the steps of the method embodiment or a combination thereof.

[0100] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0101] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0102] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A modular distributed resistance energy dissipation device, characterized in that: Depend on N Energy-consuming sub-modules are cascaded, and each energy-consuming sub-module includes: a mechanical switch MS for preventing a bypass faulty energy consuming submodule from adversely affecting the operation of the energy consuming device; An anti-reverse connection diode D1 is used to prevent current shock when the polarity of the submodule is reversed; an auxiliary circuit for adjusting the capacitor voltage in the energy consuming submodule to ensure the continuous adjustability of the output power of the energy consuming device; and An energy consumption control circuit, used for monitoring the energy consumption power reference value of the modular distributed resistance energy consumption device; In the energy consumption submodule, one end of the mechanical switch MS, the cathode of the first diode D1 and the auxiliary inductor L aux The other end of the mechanical switch MS, the anode of the first diode D1 and the first unidirectional power electronic switch S aux The emitters are connected to each other to form the second terminal T2 of the energy consumption submodule; the auxiliary inductor L aux The other end, the first unidirectional power electronic switch S aux The collector and the anode of the second diode D2 are connected to each other; the cathode of the second diode D2, the collector of the second unidirectional power electronic switch S and the positive electrode of the DC capacitor C are connected to each other; the first unidirectional power electronic switch S aux The emitter, the negative electrode of the DC capacitor C and the negative electrode of the energy-consuming resistor are connected to each other; the emitter of the second unidirectional power electronic switch S and the positive electrode of the energy-consuming resistor are connected to each other.

2. A control method for a modular distributed resistance energy dissipation device, characterized in that: include: (1) constructing a modular distributed resistance energy dissipation device as described in claim 1; (2) According to the energy consumption power required by the DC system after a fault occurs on the AC side of the receiving end of the energy DC transmission system and the capacitor voltage value of the energy consumption submodule under the unassisted duty cycle, calculate the number of submodules of the modular distributed resistance energy consumption device to be put into use N rel : In the formula, P in_G It represents the DC side input power of the grid-side converter station of the offshore wind power DC transmission system. P out_G The AC side output power of the grid-side converter station of the offshore wind power DC transmission system, P N is the maximum transmission power of the DC energy consuming device, N is the total number of energy consuming submodules in the modular distributed resistance energy consuming device; (3) According to the preset number of sub-modules calculated in step (2), N rel , the energy consumption of the DC system after a fault occurs on the AC side of the receiving end of the offshore wind power DC transmission system ( P in_G - P out_G ), DC line voltage value V DC , calculate the auxiliary duty cycle D aux : in, R is the energy dissipation resistance value of each submodule in the modular distributed resistance energy dissipation device; (4) According to the calculation results of step (2) and step (3), a first unidirectional power electronic switch S is generated respectively. aux and the trigger pulse of the second unidirectional power electronic switch S, so as to realize the continuous adjustment of the output power of the modular distributed resistance energy dissipation device.

3. An electronic device, characterized in that: include: A memory for storing computer executable instructions; A processor, wherein the processor is configured to execute the control method of the modular distributed resistance energy dissipation device of claim 2.

4. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is used to enable the computer to execute the control method of the modular distributed resistance energy dissipation device of claim 2.

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