Controllable energy dissipation device for flexible low-frequency power transmission system and control method thereof

Abstract

The application provides a controllable energy consumption device for a flexible low-frequency power transmission system and a control method thereof, which comprises a main circuit and a control module; the main circuit comprises three-phase angularly connected energy consumption resistors, a group of anti-parallel thyristors connected in series with each phase energy consumption resistor, and a coupling transformer; the low-voltage side of the coupling transformer is connected with the angularly connected points of the three-phase angularly connected energy consumption resistors, and the high-voltage side is connected with the AC bus of the converter station of the flexible low-frequency power transmission system; the control module is connected with the flexible low-frequency power transmission system and the anti-parallel thyristors in the main circuit respectively, is used for collecting the operation parameters of the flexible low-frequency power transmission system, outputting trigger pulse signals according to the operation parameters, and is also used for controlling the conduction state of the anti-parallel thyristors through the trigger pulse signals; the application can realize the smooth and continuous adjustment of the energy consumption power in a set range, and is beneficial to meeting the requirements of the flexible low-frequency power transmission system on the power regulation accuracy, dynamic response speed and transient support capacity.

Description

Technical Field

[0001] This invention relates to the field of flexible power transmission technology, and more specifically to a controllable energy dissipation device and its control method for flexible low-frequency power transmission systems. Background Technology

[0002] With the increasing demand for large-scale grid connection of new energy power generation and long-distance, high-capacity power transmission, flexible low-frequency transmission technology, with its advantages of large transmission capacity, long transmission distance, and strong system inertia adaptability, has gradually become one of the important technical directions for the construction of new power systems. However, flexible low-frequency transmission systems are susceptible to disturbances such as new energy power fluctuations, load changes, and fault transients during operation, resulting in problems such as power surplus, frequency deviation, or voltage oscillation. Therefore, it is urgent to configure efficient and controllable energy dissipation devices to absorb excess energy and provide damping support to ensure system transient stability and fault ride-through capability.

[0003] Currently, controllable power dissipation devices for flexible low-frequency transmission systems mostly employ a topology of stepped resistor switching or fixed resistance value switching. This achieves stepped power dissipation adjustment by switching different numbers of resistor branches. However, these devices have significant technical limitations: firstly, the power dissipation adjustment step size is large, making smooth and continuous adjustment from 0 to rated power impossible. This can easily trigger power step surges during system transient disturbances or faults, exacerbating system frequency / voltage oscillations. Secondly, insufficient control response speed and adjustment accuracy make it difficult to quickly match the system's dynamic damping requirements, resulting in reduced system transient stability margin and limited fault ride-through capability. This makes them unsuitable for the smoothness, rapid response, and precise control requirements of flexible low-frequency transmission systems. Furthermore, some existing phase-controlled power dissipation devices have not optimized their control strategies for the operating characteristics of flexible low-frequency transmission systems, exhibiting problems such as large steady-state errors and poor adaptability to multiple disturbance scenarios, further restricting the system's stable operation. Summary of the Invention

[0004] To address the problem that existing controllable energy dissipation devices for flexible low-frequency transmission systems cannot achieve smooth and continuous power regulation, resulting in insufficient regulation accuracy and difficulty in adapting to the dynamic requirements of flexible low-frequency transmission systems, this invention proposes a controllable energy dissipation device for flexible low-frequency transmission systems, comprising: Main circuit and control module; The main circuit includes: a three-phase delta-connected energy-consuming resistor, a set of anti-parallel thyristors connected in series with each phase of the energy-consuming resistor, and a connecting transformer; the low-voltage side of the connecting transformer is connected to the delta connection point of the three-phase delta-connected energy-consuming resistor, and the high-voltage side is connected to the AC bus of the converter station of the flexible low-frequency power transmission system. The control module is connected to the anti-parallel thyristor signals in the flexible low-frequency power transmission system and the main circuit, respectively, and is used to collect the operating parameters of the flexible low-frequency power transmission system, output trigger pulse signals according to the operating parameters, and control the conduction state of the anti-parallel thyristor through the trigger pulse signals.

[0005] Optionally, the control module includes a system-level control unit, a device-level control unit, and a valve-level control unit that are connected in sequence by signals; The system-level control unit is connected to the flexible low-frequency power transmission system and is used to collect the operating parameters of the flexible low-frequency power transmission system and calculate the target power consumption based on the operating parameters. The device-level control unit is used to generate a trigger delay angle command based on the target power consumption. The valve-level control unit is connected to the anti-parallel thyristor signal in the main circuit and is used to output a trigger pulse signal according to the trigger delay angle command.

[0006] Optionally, the device-level control unit includes: a storage subunit, a lookup table calculation subunit, a PI regulator, and an adder; The storage sub-unit contains a mapping table between pre-stored power consumption and trigger delay angle; The lookup calculation subunit is signal-connected to the storage subunit and is used to look up the mapping table according to the energy consumption target power to obtain the initial trigger delay angle; The PI regulator is used to compare the actual energy consumption power of the controllable energy consumption device with the target energy consumption power and output the firing angle compensation amount. The adder is connected to the lookup table calculation subunit and the PI regulator signal respectively, and is used to add the initial trigger delay angle to the trigger angle compensation amount to obtain the trigger delay angle command.

[0007] Optionally, the operating parameters of the flexible low-frequency power transmission system include one or more of the following: active power, frequency data, and voltage data.

[0008] Optionally, the valve-level control unit has a built-in phase-locked loop circuit for synchronizing with the voltage phase of the AC bus of the converter station.

[0009] Optionally, the trigger pulse signal is a dual-path pulse with a phase difference of 180 degrees, which drives the two thyristors in the anti-parallel thyristors respectively.

[0010] Optionally, the effective adjustment range of the trigger delay angle of the anti-parallel thyristor is 0 to π.

[0011] Based on the same inventive concept, the present invention also provides a control method for a controllable energy-consuming device for a flexible low-frequency power transmission system, comprising: Collect the operating parameters of the flexible low-frequency power transmission system; Based on the operating parameters, generate and output a trigger pulse signal; The conduction state of the anti-parallel thyristor in the controllable energy-consuming device is controlled by the trigger pulse signal.

[0012] Optionally, generating and outputting a trigger pulse signal based on the operating parameters includes: Calculate the target power consumption based on the operating parameters; Based on the target power consumption, a trigger delay angle command is generated; According to the trigger delay angle command, a trigger pulse signal is output; Optionally, the operating parameters of the flexible low-frequency power transmission system include one or more of the following: active power, frequency data, and voltage data.

[0013] Optionally, generating the trigger delay angle command based on the target power consumption includes: Based on the target power consumption, the initial trigger delay angle is obtained by querying the pre-stored mapping table between power consumption and trigger delay angle. The actual energy consumption power of the controllable energy consumption device is compared with the target energy consumption power, and the trigger angle compensation amount is output. The initial trigger delay angle is added to the trigger angle compensation amount to obtain the trigger delay angle command.

[0014] In another aspect, the present invention also provides an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, a control method for a controllable energy-consuming device for a flexible low-frequency power transmission system as described above is implemented.

[0015] In another aspect, the present invention also provides a computer device readable storage medium having an executable program stored thereon, wherein when the executable program is executed, it implements a control method for a controllable energy-consuming device for a flexible low-frequency power transmission system as described above.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a controllable energy dissipation device and its control method for a flexible low-frequency power transmission system, comprising: a main circuit and a control module; the main circuit includes: three-phase delta-connected energy dissipation resistors, a set of anti-parallel thyristors connected in series with each phase of the energy dissipation resistors, and a connecting transformer; the low-voltage side of the connecting transformer is connected to the delta connection point of the three-phase delta-connected energy dissipation resistors, and the high-voltage side is connected to the AC bus of the converter station of the flexible low-frequency power transmission system; the control module is connected to the signals of the anti-parallel thyristors in the flexible low-frequency power transmission system and the main circuit respectively, for sampling... The system collects the operating parameters of the flexible low-frequency power transmission system and outputs a trigger pulse signal based on these parameters. It also controls the conduction state of the anti-parallel thyristors through the trigger pulse signal. This invention employs an anti-parallel thyristor group connected in series with the energy-consuming resistor of each phase. By adjusting the conduction state of the thyristors through the trigger pulse signal output by the control module, it precisely controls the conduction phase and conduction duration of the energy-consuming resistor branch, achieving smooth and continuous adjustment of the energy consumption power within a set range. This meets the requirements of the flexible low-frequency power transmission system for power regulation accuracy, dynamic response speed, and transient support capability. Attached Figure Description

[0017] Figure 1 This invention provides a schematic diagram of a controllable energy dissipation device for a flexible low-frequency power transmission system. Figure 2 This invention provides a schematic diagram of the main circuit topology in a controllable energy-consuming device for a flexible low-frequency power transmission system. Figure 3 This invention provides a schematic diagram of the voltage and current waveforms across the energy-consuming resistor at different trigger delay angles in a controllable energy-consuming device for a flexible low-frequency power transmission system. Figure 4 This invention provides a curve showing the relationship between power consumption and trigger delay angle in a controllable power consumption device for a flexible low-frequency power transmission system. Figure 5 This is a schematic diagram of the structural composition of the control module in a controllable energy-consuming device for a flexible low-frequency power transmission system provided by the present invention. Figure 6 A control block diagram of a device-level control unit in a controllable energy-consuming device for a flexible low-frequency power transmission system provided by the present invention; Figure 7 A flowchart illustrating a control method for a controllable energy-consuming device in a flexible low-frequency power transmission system provided by the present invention; Figure 8 This is a schematic diagram of the structure of an electronic device provided by the present invention. Detailed Implementation

[0018] This invention proposes a controllable energy dissipation device and its control method for flexible low-frequency power transmission systems. The specific embodiments of this invention will be further described in detail below with reference to the accompanying drawings.

[0019] Example 1: This invention provides a controllable energy dissipation device for flexible low-frequency power transmission systems, as shown in the schematic diagram below. Figure 1 As shown, it includes: Main circuit and control module; The main circuit includes: a three-phase delta-connected energy-consuming resistor, a set of anti-parallel thyristors connected in series with each phase of the energy-consuming resistor, and a connecting transformer; the low-voltage side of the connecting transformer is connected to the delta connection point of the three-phase delta-connected energy-consuming resistor, and the high-voltage side is connected to the AC bus of the converter station of the flexible low-frequency power transmission system. The control module is connected to the anti-parallel thyristor signals in the flexible low-frequency power transmission system and the main circuit, respectively, and is used to collect the operating parameters of the flexible low-frequency power transmission system, output trigger pulse signals according to the operating parameters, and control the conduction state of the anti-parallel thyristor through the trigger pulse signals.

[0020] Example: A schematic diagram of the main circuit topology of a controllable energy-consuming device is shown below. Figure 2 As shown, the main circuit can adopt a three-phase three-wire topology (the three phases correspond to phases A, B, and C respectively), mainly consisting of the AC bus of the converter station of the flexible low-frequency transmission system, three-phase connecting transformers, three sets of anti-parallel thyristors, and three-phase delta-connected energy-consuming resistors (represented by R in the figure); the high-voltage side of each phase connecting transformer is connected to the AC bus of the converter station, and the low-voltage side is connected to the input terminal of the corresponding phase branch, which is used to realize the electrical isolation and voltage matching between the main circuit and the upper-level flexible low-frequency transmission system; in each phase branch, a set of anti-parallel thyristors... A parallel thyristor is connected in series with a power-dissipating resistor. The anti-parallel thyristor serves as the core component for power regulation, used to adjust the branch current amplitude by controlling the conduction angle. The power-dissipating resistor is the energy-consuming component that absorbs excess power. The ends of the three-phase branches are connected end to end by wires to form a three-phase delta closed loop, which can ensure the balance and stable operation of the three-phase power. The control electrode of the anti-parallel thyristor has a reserved signal connection interface for establishing a signal connection with an external control module to receive trigger pulse signals and achieve precise control of its conduction state.

[0021] To illustrate the correspondence between the anti-parallel thyristor triggering control and the changes in the electrical quantities of the energy-consuming resistor in the aforementioned controllable energy-consuming device, the waveform diagrams of the voltage and current across the energy-consuming resistor at different trigger delay angles can be shown as follows: Figure 3 As shown in the figure, the current waveforms of the energy-consuming resistor are presented from top to bottom (for example, it can be achieved by using...). This indicates that the peak value is ), thyristor 1 trigger pulse, thyristor 2 trigger pulse and power dissipation resistor voltage waveform (for example, can be used) The peak value is ), phase angle (e.g., using (represented) and trigger delay angle (e.g., using) The phase point corresponding to (representation) can be represented as The trigger pulses of thyristor 1 and thyristor 2 are issued at different phase times, respectively controlling the conduction periods of the positive and negative half-cycle currents, so that the current... With voltage The waveform exhibits a sinusoidal half-wave shape only within the interval following the trigger pulse, with a trigger delay angle of [missing information]. The trigger delay angle directly determines the on-state phase and conduction duration of the current and voltage, thereby controlling the effective conduction area and power consumption of the energy-consuming resistor. Specifically, to further quantify the relationship between the trigger delay angle and the power consumption, the curve showing the relationship between power consumption and the trigger delay angle can be shown as follows: Figure 4 As shown in the figure, the trigger delay angle is... The x-axis represents the energy consumption (ranging from 0 to π), with the energy consumption power (e.g., using...) (represented), as can be seen from the curve distribution, when At that time, the power consumption can reach its maximum value. This corresponds to the fully conducting condition of the energy-consuming resistor. Gradually increase, power consumption Approaching 0, corresponding to a near-off operating condition where the energy-consuming resistance is almost off, indicates that adjusting the trigger delay angle... This allows the power consumption to be between 0 and... The system is continuously and smoothly adjustable within a certain range, which can fully reflect the precise control capability of the anti-parallel thyristor phase control regulation strategy on energy consumption power, and provides a smooth and continuous power regulation means for flexible low-frequency power transmission systems.

[0022] In one implementation, the control module may include a system-level control unit, a device-level control unit, and a valve-level control unit connected in sequence by signals, as shown in the schematic diagram below. Figure 5 As shown; The system-level control unit is connected to the flexible low-frequency power transmission system and is used to collect the operating parameters of the flexible low-frequency power transmission system and calculate the target power consumption based on the operating parameters. The device-level control unit is used to generate a trigger delay angle command based on the target power consumption. The valve-level control unit is connected to the anti-parallel thyristor signal in the main circuit and is used to output a trigger pulse signal according to the trigger delay angle command; In this implementation, the active power transmitted by the flexible low-frequency transmission system is monitored in real time by the aforementioned system-level control unit. When a power imbalance is detected in the system and energy-consuming devices need to be activated, the target energy-consuming power value is determined based on the power before the fault or a preset algorithm (such as a droop control algorithm based on frequency deviation). The device-level control unit receives the target energy-consuming power value and generates a trigger delay angle command. Actual power feedback is introduced, and the reference trigger angle is dynamically fine-tuned through a PI controller to generate a precise trigger delay angle command. This implementation uses a hierarchical control strategy, utilizing the system-level control unit to achieve rapid perception of the system's power imbalance state and top-level decision-making on the target power. It can closely follow the power fluctuations and transient disturbances of the flexible low-frequency transmission system, ensuring that the energy-consuming devices are activated in a timely manner and output matching damped power. The lookup table feedforward stage can quickly output the initial firing angle based on the pre-stored mapping relationship between power and firing angle, eliminating the control lag caused by complex real-time calculations. This significantly improves the dynamic response speed of the device and meets the requirements of rapid damping support for system transient processes. At the same time, through actual power feedback and PI closed-loop regulation, it can correct control errors caused by factors such as resistance temperature drift, voltage fluctuation, and system parameter deviation in real time, effectively eliminating steady-state power deviation, ensuring the regulation accuracy of energy consumption power, and avoiding the power step impact and regulation dead zone problems of traditional staged switching methods. Ultimately, it achieves rapid response, precise control, and smooth continuous regulation of energy consumption power, effectively improving the transient stability, frequency and voltage support capability, and fault ride-through performance of flexible low-frequency transmission systems, and adapting to the stable control requirements of various complex operating conditions such as new energy fluctuations, load changes, and fault transients.

[0023] In one implementation, the device-level control unit includes: a storage subunit, a lookup table calculation subunit, a PI regulator, and an adder; The storage sub-unit contains a mapping table between pre-stored power consumption and trigger delay angle; The lookup calculation subunit is signal-connected to the storage subunit and is used to look up the mapping table according to the energy consumption target power to obtain the initial trigger delay angle; The PI regulator is used to compare the actual energy consumption power of the controllable energy consumption device with the target energy consumption power and output the firing angle compensation amount. The adder is connected to the lookup table calculation subunit and the PI regulator signal respectively, and is used to add the initial trigger delay angle to the trigger angle compensation amount to obtain the trigger delay angle command; For example, the control block diagram of a device-level control unit can be as follows: Figure 6 As shown, the actual energy consumption power Compared with the energy consumption target power reference value (e.g., using The input (represented) is subtracted to perform a difference operation, resulting in a power deviation signal. This deviation signal is then processed by the dead-zone (DB) module to filter out minute power deviations, avoid frequent control actions, and improve the operational stability of the flexible low-frequency system. The processed deviation signal is then input to a PI controller (i.e., a proportional-integral controller), which generates a corresponding adjustment amount (corresponding to the aforementioned trigger angle compensation amount) through proportional and integral operations. This achieves a dynamic response to the power deviation. The adjustment amount is further accumulated through an integral stage to eliminate steady-state control errors and ensure power regulation accuracy. Finally, the integrated adjustment amount is compared with the initial trigger delay angle. Perform superposition calculations to output the final trigger delay angle reference value. This provides precise trigger angle commands to the valve-level control unit, thereby enabling closed-loop precise adjustment of the energy consumption power of the controllable energy-consuming device. For example, the relationship between the above-mentioned power consumption and the trigger delay angle can be established based on the following mathematical model: assuming the effective value of the line voltage of the flexible low-frequency transmission system is used... This indicates that the energy-consuming resistance of each phase is organized as follows: The trigger delay angle is Three-phase total power consumption (e.g., using) (indicated) and The relationship can be as follows: ; in, The effective adjustment range is 0 to (That is, the effective adjustment range of the trigger delay angle of the anti-parallel thyristor is 0 to...) ); For example, the operating parameters of the flexible low-frequency transmission system may include one or more of the following: active power, frequency data, and voltage data.

[0024] In one implementation, the valve-level control unit has a built-in phase-locked loop circuit for synchronizing the voltage phase with the AC bus of the converter station.

[0025] In one implementation, the trigger pulse signal is a dual-path pulse with a phase difference of 180 degrees, which drives the two thyristors in the anti-parallel thyristors respectively.

[0026] In summary, this invention addresses the problem that existing controllable energy dissipation devices for flexible low-frequency transmission systems cannot achieve smooth and continuous power regulation, resulting in insufficient regulation accuracy and difficulty in adapting to the dynamic requirements of flexible low-frequency transmission systems. It proposes a controllable energy dissipation device for flexible low-frequency transmission systems. By employing a three-phase delta-connected main circuit topology with series-parallel thyristors connecting energy dissipation resistors, and a hierarchical control module that collects system operating parameters and generates trigger pulses based on feedforward lookup tables and power feedback closed loops, the device precisely regulates the thyristor trigger delay angle and conduction state. This enables smooth and continuous adjustment of energy dissipation power within a preset range, effectively improving power regulation accuracy and dynamic response speed. It eliminates the power step shocks and regulation dead zones of traditional staged switching, quickly smoothing out system power surplus, frequency deviation, and voltage oscillations. This significantly enhances the transient stability margin and fault ride-through capability of flexible low-frequency transmission systems, better adapting to the dynamic damping support requirements of systems in scenarios involving large-scale grid connection of new energy sources and long-distance, high-capacity power transmission.

[0027] Example 2: The control process of a controllable energy dissipation device for a flexible low-frequency power transmission system proposed in this invention is illustrated by a specific embodiment. The main circuit of the controllable energy dissipation device in this embodiment includes three-phase energy dissipation resistors (e.g., using...). , , (Represented), connected in a delta configuration, with each phase resistor connected in series with a set of anti-parallel thyristors (e.g., V1 & V4 for phase A). This three-phase structure can be connected via a single transformer (e.g., using...). (This refers to the AC bus of the converter station connected to the flexible low-frequency transmission system.) When the flexible low-frequency transmission system is operating normally, the thyristors are closed, and the energy-consuming device is not in operation. When the flexible low-frequency transmission system detects excess power at the sending end (such as in scenarios like receiving-end faults or sudden increases in renewable energy power), the control module triggers the thyristors, connecting the energy-consuming resistor to the flexible low-frequency transmission system to absorb the excess power. The control module has a three-layer architecture: the system-level control unit is located in the energy management system or converter station control layer, responsible for collecting system frequency, voltage, and power operation information. Once a power imbalance is detected requiring the activation of the energy-consuming device, it immediately calculates the target power to be absorbed based on the power transmitted before the fault or the preset power and frequency droop characteristics. The data is then sent to the device-level control unit; the device-level control unit, as the core control component, has pre-stored the energy consumption power derived from the active power calculation formula. With trigger delay angle The mapping table receives First, the initial trigger angle is obtained by looking up a table. Simultaneously, the actual current and voltage signals of the energy-consuming resistors are collected to calculate the actual energy consumption power. ,Will and The difference is input to the PI regulator to obtain the firing angle compensation amount. ,Will and The summation generates the final trigger delay angle command. This composite control method utilizes a mathematical model feedforward to achieve rapid response, and eliminates the effects of parameter deviations and disturbances through feedback closed loop; the valve-level control unit receives... Then, the AC bus voltage phase is synchronized through an internal phase-locked loop circuit, with a delay after the corresponding line voltage zero-crossing point for each phase. Angle, generating a pair of trigger pulses with a phase difference of 180 degrees, respectively driving the two devices of the opposite parallel thyristors, so that they conduct alternately in the positive and negative half-cycles of the voltage, thereby generating a controllable alternating current in the energy-consuming resistor and achieving precise power absorption.

[0028] In terms of parameter design, taking a 220kV flexible low-frequency transmission system as an example, the maximum power absorption is set at 100MW. After conversion by the connecting transformer, the low-voltage side line voltage U=10kV. From the maximum power formula, the resistance value of each phase R≈3Ω can be preliminarily calculated. The selection of thyristors needs to comprehensively consider the maximum current stress and 2-3 times the overvoltage margin, and match the corresponding trigger drive board; combined with As can be seen from the relational properties, in The power regulation linearity is good within the range of approximately 30° to 150°, which is the preferred operating range. This ensures that the device can achieve smooth and continuous power regulation under different operating conditions, providing efficient transient damping support for flexible low-frequency power transmission systems and improving the system's transient stability and fault ride-through capability.

[0029] This embodiment demonstrates that the controllable energy dissipation device for a flexible low-frequency power transmission system proposed in this invention achieves the technical effects of smooth and continuous adjustment of energy dissipation power across the entire range, fast dynamic response, and high adjustment accuracy. Specifically, by relying on a three-phase delta topology and an anti-parallel thyristor phase control structure, it solves the problems of long power adjustment steps and easy generation of step shocks in traditional staged switching devices. Through three-level collaborative control at the system, device, and valve levels, combined with a composite control strategy of lookup table feedforward and PI power feedback, it can ensure rapid response under transient disturbances while eliminating the effects of resistance temperature drift and voltage fluctuations. The system effectively controls control errors to achieve precise power tracking. The valve-level phase-locked loop phase synchronization and dual-path pulse drive design ensure reliable conduction of the thyristor during both positive and negative half-cycles, resulting in balanced and stable three-phase energy consumption. Combined with an optimal trigger angle operating range of 30° to 150°, it further enhances the linearity of power regulation and control stability. It can quickly absorb excess energy in scenarios of power surplus, such as receiving-end faults and sudden increases in renewable energy power, effectively smoothing system frequency and voltage fluctuations, significantly enhancing the transient stability and fault ride-through capability of flexible low-frequency transmission systems, and adapting to the damping support requirements of long-distance, large-capacity flexible low-frequency transmission scenarios.

[0030] Example 3: Based on the same inventive concept, this invention also provides a control method for a controllable energy-consuming device in a flexible low-frequency power transmission system, as shown in the flowchart below. Figure 7 As shown, it includes: Step 1: Collect the operating parameters of the flexible low-frequency power transmission system; Step 2: Generate and output a trigger pulse signal based on the operating parameters; Step 3: Control the conduction state of the anti-parallel thyristor in the controllable energy dissipation device through the trigger pulse signal.

[0031] For example, the operating parameters of the flexible low-frequency transmission system in step 1 above may include one or more of the following: active power, frequency data, and voltage data.

[0032] In one implementation, step 2 above, which generates and outputs a trigger pulse signal based on the operating parameters, may include: Calculate the target power consumption based on the operating parameters; Based on the target power consumption, a trigger delay angle command is generated; According to the trigger delay angle command, a trigger pulse signal is output; In one implementation, generating the trigger delay angle command based on the target power consumption may include: Based on the target power consumption, the initial trigger delay angle is obtained by querying the pre-stored mapping table between power consumption and trigger delay angle. The actual energy consumption power of the controllable energy consumption device is compared with the target energy consumption power, and the trigger angle compensation amount is output. The initial trigger delay angle is added to the trigger angle compensation amount to obtain the trigger delay angle command.

[0033] Example 4: like Figure 8 As shown, the present invention also provides an electronic device, which may be a computer device, a microcontroller device, a smart mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, processor, and transceiver component are connected via a bus; the memory can be used to store executable programs, and an exemplary executable program may include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, which can be accessed and / or modified when instructions are executed.

[0034] The processor may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and it is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to realize the corresponding method flow or corresponding function, so as to realize the steps of the control method for a controllable energy consumption device for a flexible low-frequency power transmission system in the above embodiments.

[0035] Example 5: Based on the same inventive concept, this invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory). This readable storage medium is a memory device within an electronic device used to store programs and data. It is understood that the storage medium here can include both built-in storage media within the electronic device and extended storage media supported by the electronic device. The storage medium provides storage space, which stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more executable programs (including program code). It should be noted that the storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. Loading and executing one or more instructions stored in the storage medium by the processor can implement the steps of a control method for a controllable energy-consuming device for a flexible low-frequency power transmission system as described in the above embodiments.

[0036] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0037] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0038] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0039] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the scope of protection of the claims pending approval.

Claims

1. A controllable energy dissipation device for flexible low-frequency power transmission systems, characterized in that, include: Main circuit and control module; The main circuit includes: a three-phase delta-connected energy-consuming resistor, a set of anti-parallel thyristors connected in series with each phase of the energy-consuming resistor, and a connecting transformer; the low-voltage side of the connecting transformer is connected to the delta connection point of the three-phase delta-connected energy-consuming resistor, and the high-voltage side is connected to the AC bus of the converter station of the flexible low-frequency power transmission system. The control module is connected to the anti-parallel thyristor signals in the flexible low-frequency power transmission system and the main circuit, respectively, and is used to collect the operating parameters of the flexible low-frequency power transmission system, output trigger pulse signals according to the operating parameters, and control the conduction state of the anti-parallel thyristor through the trigger pulse signals.

2. The apparatus as claimed in claim 1, characterized in that, The control module includes a system-level control unit, a device-level control unit, and a valve-level control unit that are connected in sequence by signals. The system-level control unit is connected to the flexible low-frequency power transmission system and is used to collect the operating parameters of the flexible low-frequency power transmission system and calculate the target power consumption based on the operating parameters. The device-level control unit is used to generate a trigger delay angle command based on the target power consumption. The valve-level control unit is connected to the anti-parallel thyristor signal in the main circuit and is used to output a trigger pulse signal according to the trigger delay angle command.

3. The apparatus as described in claim 2, characterized in that, The device-level control unit includes: a storage subunit, a lookup table calculation subunit, a PI regulator, and an adder; The storage sub-unit contains a mapping table between pre-stored power consumption and trigger delay angle; The lookup calculation subunit is signal-connected to the storage subunit and is used to look up the mapping table according to the energy consumption target power to obtain the initial trigger delay angle; The PI regulator is used to compare the actual energy consumption power of the controllable energy consumption device with the target energy consumption power and output the firing angle compensation amount. The adder is connected to the lookup table calculation subunit and the PI regulator signal respectively, and is used to add the initial trigger delay angle to the trigger angle compensation amount to obtain the trigger delay angle command.

4. The apparatus as described in claim 1 or 2, characterized in that, The operating parameters of the flexible low-frequency power transmission system include one or more of the following: active power, frequency data, and voltage data.

5. The apparatus as described in claim 2, characterized in that, The valve-level control unit has a built-in phase-locked loop circuit for synchronizing the voltage phase with the AC bus of the converter station.

6. The apparatus as claimed in claim 2, characterized in that, The trigger pulse signal is a dual-path pulse with a phase difference of 180 degrees, which drives the two thyristors in the anti-parallel thyristor respectively.

7. The apparatus as claimed in claim 2, characterized in that, The effective adjustment range of the trigger delay angle of the anti-parallel thyristor is from 0 to π.

8. A control method for a controllable energy-consuming device applied to a flexible low-frequency power transmission system according to any one of claims 1 to 7, characterized in that, include: Collect the operating parameters of the flexible low-frequency power transmission system; Based on the operating parameters, generate and output a trigger pulse signal; The conduction state of the anti-parallel thyristor in the controllable energy-consuming device is controlled by the trigger pulse signal.

9. An electronic device, characterized in that, include: At least one processor and memory; The memory and processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, a control method for a controllable energy-consuming device for a flexible low-frequency power transmission system as described in claim 8 is implemented.

10. A computing device readable storage medium, characterized in that, It contains an execution program, which, when executed, implements the control method for a controllable energy-consuming device for a flexible low-frequency power transmission system as described in claim 8.

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