Direct-current bus voltage stabilizing device with wind power and energy storage collaboration

Abstract

The embodiment of the invention relates to the field of new energy power generation control of a power system, in particular to a wind power and energy storage coordinated direct current bus voltage stabilizing device, which comprises a wind power module, an energy storage module, a core control module, a voltage acquisition module and a power distribution module, the acquisition end of the voltage acquisition module is connected in parallel with the DC bus, and the signal output end of the voltage acquisition module is connected with the core control module and is used for acquiring a voltage signal of the DC bus in real time; the core control module is respectively connected with the wind power module, the energy storage module, the voltage acquisition module and the power distribution module, carries out voltage state detection according to the voltage signal, and generates and issues a wind power and energy storage coordinated regulation instruction; the output end of the power distribution module is connected with the direct current bus, and the power distribution module is used for dynamically coupling the adjusted power and the charging and discharging power according to the coupling proportion to obtain coupling power and transmitting the coupling power to the direct current bus.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and in particular to a DC bus voltage stabilization device that integrates wind power and energy storage. Background Technology

[0002] As a core component of clean and renewable energy, wind power has experienced explosive growth in installed capacity. However, wind power inherently possesses intermittency, volatility, and randomness. When a large amount of wind power is connected to a DC microgrid or flexible DC transmission system via converters, it can easily trigger severe fluctuations in the DC bus voltage. As the core hub for energy transmission and distribution in the system, the voltage stability of the DC bus directly determines the power supply quality, equipment operational safety, and the reliability of grid dispatch.

[0003] Current technologies for DC bus voltage stabilization can be mainly divided into two categories: one is based on wind power side self-regulation, which optimizes the control strategy of wind turbine converters, such as improved droop control and virtual synchronous generator control, to adjust active power output to suppress voltage fluctuations; the other is based on compensation technology of independent energy storage systems, which uses energy storage devices such as lithium batteries and vanadium redox flow batteries to inject or absorb power in real time through PWM converters to quickly smooth out bus voltage deviations.

[0004] While existing technologies have alleviated the DC bus voltage fluctuation problem to some extent, several shortcomings remain that urgently need to be addressed: First, the robustness of independent wind power control is insufficient, and the droop control coefficient is difficult to adapt to the wide fluctuations in wind power. When sudden changes in wind speed cause power surges exceeding the adjustment range, voltage deviations easily exceed the allowable threshold. Second, the operating efficiency of independent energy storage systems is relatively low. To ensure voltage stability, a large amount of reserve capacity needs to be reserved, resulting in a high idle rate of energy storage resources. Furthermore, when operating independently, the adjustable potential of wind power cannot be fully utilized to achieve source-storage complementarity. Moreover, the control strategies of wind power and energy storage lack coordination, and conflicts or redundancies may occur in their actions during voltage regulation, increasing the complexity of system control.

[0005] Therefore, how to construct an efficient and coordinated control strategy to improve the accuracy and robustness of DC bus voltage stability control while avoiding regulation conflicts is an urgent problem for those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide at least one DC bus voltage stabilization device for wind power and energy storage synergy, which can organically integrate the regulation potential of the wind power side with the compensation capability of the energy storage system to achieve the optimal balance between system stability and economy.

[0007] To address the aforementioned technical problems, at least one embodiment of this application provides a DC bus voltage stabilization device for wind power and energy storage coordination, comprising:

[0008] Wind power module, energy storage module, core control module, voltage acquisition module, and power distribution module;

[0009] The voltage acquisition module's acquisition terminal is connected in parallel to the DC bus, and its signal output terminal is connected to the core control module. It is used to acquire the voltage signal of the DC bus in real time and transmit the voltage signal to the core control module.

[0010] The core control module is connected to the wind power module, the energy storage module, the voltage acquisition module, and the power distribution module, respectively. It is used to detect the voltage status based on the voltage signal, generate coordinated control commands for wind power and energy storage based on the voltage status, and send them to the wind power module, the energy storage module, and the power distribution module.

[0011] The first input terminal of the power distribution module is connected to the wind power module to receive the regulated power input from the wind power module; the second input terminal is connected to the energy storage module to receive the regulated charging and discharging power input from the energy storage module; the output terminal is connected to the DC bus to dynamically couple the regulated power and the charging and discharging power according to the coupling ratio to obtain the coupled power, and transmit the coupled power to the DC bus; the coupling ratio is determined according to the coordinated control command.

[0012] In one embodiment, the core control module includes: a state determination unit, a power balance calculation unit, and an instruction encoding unit;

[0013] The state determination unit is used to compare the voltage signal with a preset voltage threshold to determine the voltage state.

[0014] The power balance calculation unit is used to match the corresponding power regulation coefficient according to the voltage state, and calculate the wind power regulation amount and energy storage charging and discharging amount according to the power regulation coefficient and the voltage state, and determine the power coupling ratio by combining the wind power regulation amount and the energy storage charging and discharging amount.

[0015] The instruction encoding unit is used to integrate the wind power regulation amount, the energy storage charging and discharging amount and the coupling ratio into a standardized control frame, which serves as the coordinated control instruction.

[0016] In one embodiment, the power balance calculation unit includes: a dynamic coefficient matching subunit, an energy storage status receiving subunit, and an adjustment amount correction subunit;

[0017] The energy storage status receiving subunit is signal-connected to the energy storage module and is used to acquire the real-time SOC value, terminal voltage and temperature signal of the energy storage module.

[0018] The input terminal of the dynamic coefficient matching subunit is connected to the state determination unit and the energy storage state receiving subunit, respectively, and is used to dynamically adjust the value of the power regulation coefficient according to the voltage state and the real-time SOC value.

[0019] The adjustment correction subunit is used to correct the wind power adjustment amount and the energy storage charging and discharging amount based on the adjusted power regulation coefficient, and to determine the coupling ratio based on the correction result.

[0020] In one embodiment, the power distribution module includes a bidirectional DC / DC converter and a power regulation switch group;

[0021] The input terminals of the bidirectional DC / DC converter are connected to the wind power module and the energy storage module, respectively, and the output terminal is connected to the power regulation switch group;

[0022] The output terminal of the power regulation switch group is connected to the DC bus, and the controlled terminal is connected to the core control module.

[0023] In one embodiment, the power distribution module further includes a power coupling unit;

[0024] The input terminal of the power coupling unit is connected to the bidirectional DC / DC converter, and the output terminal is connected to the power regulation switch group.

[0025] The power coupling unit has a built-in current sharing resistor network, which is used to perform current sharing processing on the wind power after regulation and the energy storage charging and discharging power.

[0026] In one embodiment, the power regulation switch group is composed of a plurality of IGBT power transistors, the gate of each IGBT power transistor is connected to the core control module, and the drain and source are connected in series between the power coupling unit and the DC bus.

[0027] The core control module controls the coupled power output by adjusting the duty cycle of the IGBT power transistor.

[0028] In one embodiment, the bidirectional DC / DC converter has built-in redundant parallel branches;

[0029] The redundant parallel branch is connected in parallel with the main circuit branch of the bidirectional DC / DC converter, and the redundant parallel branch is connected in series with a redundant switching switch.

[0030] The controlled terminal of the redundant switching switch is connected to the core control module, the power input terminals of the redundant parallel branches are respectively connected to the wind power module and the energy storage module, and the power output terminals are connected to the input terminals of the power coupling unit.

[0031] In one embodiment, the power distribution module further includes an integrated port switching unit;

[0032] The integrated port adapter unit has built-in electromagnetic isolation circuit and power matching circuit.

[0033] The input terminal of the integrated port adapter unit is connected to the output terminals of the main circuit branch and the redundant parallel branch of the bidirectional DC / DC converter. The output terminal is connected in series with the input terminal of the dynamic impedance matching unit, and electrical isolation between the input and output sides is achieved through the electromagnetic isolation circuit.

[0034] In one embodiment, the power distribution module further includes a dynamic impedance matching unit;

[0035] The dynamic impedance matching unit is connected in series between the power coupling unit and the power regulation switch group, and the controlled end is connected to the core control module.

[0036] The dynamic impedance matching unit has a built-in adjustable impedance network, which is used to dynamically adjust the equivalent impedance according to the coupling ratio in the coordinated control command.

[0037] In one embodiment, the dynamic impedance matching unit includes several switchable resistor branches and impedance control subunits;

[0038] The switchable resistor branches are connected in parallel, and each branch is connected in series with an electronic switch.

[0039] The input terminal of the impedance control subunit is connected to the core control module, and the output terminal is connected to the controlled terminal of each electronic switch, which is used to control the on / off state of the corresponding electronic switch according to the coupling ratio.

[0040] In the DC bus voltage stabilization device for wind power and energy storage coordination provided in the embodiments of this application, the voltage acquisition module adopts a parallel connection method to ensure accurate and real-time acquisition of the bus voltage signal, providing reliable data support for regulation decisions. The core control module generates coordinated regulation commands based on the voltage status, realizing the synchronous matching of wind power and energy storage actions, and avoiding regulation conflicts caused by the independent operation of a single module. The power distribution module independently receives two types of regulated power through dual input terminals and dynamically merges them according to the coupling ratio determined by the command. This achieves orderly adaptation of wind power fluctuation power and energy storage compensation power, and can also output stable coupled power to the DC bus, effectively mitigating the impact of wind power randomness on the bus voltage. With the core control module as the central hub, this device coordinates the entire process of voltage acquisition, wind power regulation, energy storage charging and discharging, and power distribution. It breaks through the limitations of traditional decentralized control of wind power and energy storage, where power transmission and voltage monitoring are disconnected. The overall architecture is simple and the closed-loop regulation is highly efficient. From data acquisition and command generation to power coupling, a complete technical link is formed, which greatly improves the stability of DC bus voltage and the reliability of system operation. Attached Figure Description

[0041] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, and these illustrative descriptions do not constitute a limitation on the embodiments.

[0042] Figure 1 This is a schematic diagram of a DC bus voltage stabilization device for wind power and energy storage coordination, provided in one embodiment of this application. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this application to help readers better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the various embodiments below is for the convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0044] This invention proposes a DC bus voltage stabilization device for wind power and energy storage collaboration. The implementation details of the DC bus voltage stabilization device for wind power and energy storage collaboration in this embodiment are described below. The following content is only for the convenience of understanding and is not necessary for implementing this solution.

[0045] Example 1:

[0046] The structure of the wind power and energy storage coordinated DC bus voltage stabilization device in this embodiment can be as follows: Figure 1As shown, it includes: wind power module, energy storage module, core control module, voltage acquisition module and power distribution module.

[0047] The overall connection relationship of the device is as follows: the acquisition end of the voltage acquisition module is connected in parallel to the DC bus, and the signal output end is connected to the core control module to transmit real-time voltage signals; the core control module acts as the central hub, establishing bidirectional connections with the wind power module, energy storage module, and power distribution module respectively, receiving the operating parameters of the wind power module and the status signals of the energy storage module, and issuing coordinated control commands to the three; in terms of energy transmission, the power output ends of the wind power module and the energy storage module are connected to the first and second input ends of the power distribution module respectively, and the output end of the power distribution module is connected to the DC bus to transmit the coupled stable power to the bus.

[0048] Specifically, the acquisition end of the voltage acquisition module is connected in parallel to the DC bus, so that the acquisition module and the DC bus form an equipotential connection, ensuring the real-time capture of the bus's true voltage signal, providing reliable data support for the voltage regulation and coordinated control of the entire device, and ensuring the accuracy of power regulation and coupling; at the same time, the signal output end of the voltage acquisition module is connected to the core control module, which is used to transmit the acquired voltage signal to the core control module without intermediate transfer to ground.

[0049] The core control module establishes communication connections with the wind power module, energy storage module, voltage acquisition module, and power distribution module. On one hand, it receives DC bus voltage data from the voltage acquisition module to perform voltage status detection. On the other hand, based on the detection results, it generates coordinated control commands for wind power regulation and energy storage charging / discharging, and distributes these commands to the wind power module, energy storage module, and power distribution module, achieving unified scheduling of the entire system. This configuration breaks away from the traditional decentralized architecture where wind power and energy storage are independently controlled, and power distribution is disconnected from source-end regulation. Through the central coordinating role of the core control module, a closed-loop control link is constructed, encompassing data acquisition, status judgment, command generation, and execution feedback. This ensures that the power regulation of the wind power module, the charging / discharging actions of the energy storage module, and the coupled execution of the power distribution module are synchronized, avoiding voltage regulation conflicts or lags caused by independent actions of a single module. Furthermore, centralized scheduling simplifies the system control link, reduces signal redundancy between multiple modules, and improves control response speed and accuracy, guaranteeing the achievement of the DC bus voltage stability target from an architectural perspective.

[0050] The power distribution module establishes energy links with the wind power module and the energy storage module through dual input terminals, respectively, to receive the output power of the two types of modules after regulation, and then forms an energy output channel by directly connecting the output terminal to the DC bus.

[0051] Based on the coordinated control instructions issued by the core control module, the power distribution module dynamically integrates the regulated power of wind power with the charging and discharging power of energy storage according to the coupling ratio specified in the instructions, generates the coupling power adapted to the DC bus requirements, and completes the transmission.

[0052] The output power of the wind power module changes dynamically with wind conditions, while the charging and discharging status of the energy storage module adjusts according to bus voltage fluctuations. If these two types of power are directly connected to the bus, voltage oscillations can easily occur due to superimposed imbalances. In this device, on the one hand, a dynamic coupling mechanism and command-based coupling ratio are used to precisely match and integrate the two types of power, ensuring that the coupled power output to the bus always matches the load demand. This mitigates the impact of wind power fluctuations on voltage from the energy distribution perspective. On the other hand, by independently receiving power at dual input terminals, physical isolation and orderly access of wind power and energy storage energy flows are achieved, avoiding mutual interference. This allows the control commands of the core control module to be transformed into actual energy regulation effects through the power distribution module, ensuring the efficient operation of the entire system's closed-loop control system.

[0053] Based on the above introduction, in the DC bus voltage stabilization device for wind power and energy storage coordination provided in this embodiment, the voltage acquisition module adopts a parallel connection method to ensure accurate and real-time acquisition of the bus voltage signal, providing reliable data support for control decisions. The core control module generates coordinated control commands based on the voltage status, realizing the synchronous matching of wind power and energy storage actions, avoiding regulation conflicts caused by the independent operation of a single module. The power distribution module independently receives two types of regulated power through dual input terminals and dynamically merges them according to the coupling ratio determined by the command. This achieves orderly adaptation of wind power fluctuation power and energy storage compensation power, and can also output stable coupled power to the DC bus, effectively mitigating the impact of wind power randomness on the bus voltage. With the core control module as the central hub, this device coordinates the entire process of voltage acquisition, wind power regulation, energy storage charging and discharging, and power distribution. It breaks through the limitations of traditional decentralized control of wind power and energy storage, where power transmission and voltage monitoring are disconnected. The overall architecture is simple and the control loop is highly efficient. From data acquisition and command generation to power coupling, a complete technical link is formed, significantly improving the stability of the DC bus voltage and the reliability of system operation.

[0054] Example 2:

[0055] The above embodiments do not limit the specific control mechanism of the core control module and the configuration of sub-modules. In order to ensure the control accuracy, functional feasibility and instruction transmission standardization of the core control module, this embodiment proposes to refine the core control module into three sub-units: a state determination unit, a power balance calculation unit and an instruction encoding unit.

[0056] Specifically, the signal input terminal of the state determination unit establishes a dedicated connection with the signal output terminal of the voltage acquisition module, and its signal output terminal is directly connected to the first input terminal of the power balance calculation unit; the signal output terminal of the power balance calculation unit is connected to the input terminal of the instruction encoding unit; and the signal output terminal of the instruction encoding unit establishes bidirectional signal links with the regulation control terminal of the wind power module, the charging and discharging control terminal of the energy storage module, and the control terminal of the power distribution module, respectively.

[0057] Specifically, the state determination unit compares the bus voltage signal transmitted by the voltage acquisition module with a preset voltage threshold to accurately determine whether the bus is in an overvoltage, undervoltage, or normal voltage state. The specific voltage state type can be set according to the actual use scenario, and this embodiment does not limit it.

[0058] Based on the voltage state, the power balance calculation unit matches the corresponding power regulation coefficient, further calculates the power value that the wind power module needs to adjust and the charging and discharging power value of the energy storage module, and determines the coupling ratio of the dual-source power by combining the two types of parameters.

[0059] The instruction encoding unit integrates the wind power regulation, energy storage charging and discharging, and coupling ratio calculated above into a standardized control frame with a unified format, forming a coordinated control instruction that can be directly sent to each execution module.

[0060] In this configuration, the state determination unit focuses on a specific comparison between the voltage signal and the preset threshold, avoiding judgment delays or misjudgments caused by the superposition of multiple tasks; the power balance calculation unit matches the power regulation coefficient based on a clear voltage state, and specifically calculates the wind power regulation, energy storage charging and discharging, and coupling ratio, making the parameter calculation highly compatible with the actual operating conditions and avoiding the problem of mutual interference of parameters in traditional centralized calculations; the instruction encoding unit focuses on the standardized integration of control parameters, ensuring that the output instruction format is unified and the information is complete, eliminating execution deviations caused by differences in instruction parsing between multiple modules from the source.

[0061] To further address the issue that the power balance calculation unit relies solely on voltage status to determine control parameters, which is disconnected from the actual operating capacity of the energy storage module, and to improve the accuracy and adaptability of power regulation, this embodiment proposes to add a dynamic coefficient matching subunit, an energy storage status receiving subunit, and a regulation correction subunit to the power balance calculation unit.

[0062] The energy storage status receiving subunit establishes a dedicated signal link with the energy storage module to capture core operating signals such as the SOC value, terminal voltage, and temperature of the energy storage module in real time, supplementing the power calculation with key status dimensions. The dynamic coefficient matching subunit links the outputs of the status determination unit and the energy storage status receiving subunit, combining the voltage status with the real-time SOC value of the energy storage as a dual basis to achieve dynamic adaptation of the power regulation coefficient rather than fixed matching. The regulation correction subunit uses the adjusted coefficient as a benchmark to perform secondary calibration on the wind power regulation and energy storage charging and discharging, and finally determines the power coupling ratio based on the calibration results.

[0063] The introduction of energy storage status signals fills the information gap in power calculation, avoiding over-regulation or failure caused by ignoring low SOC, over-temperature, and other states of energy storage. The combination of dynamic coefficients and correction mechanisms makes wind power regulation, energy storage charging and discharging, and coupling ratios more closely match the actual operating requirements of the system, significantly reducing the risk of overcharging and over-discharging of energy storage and the blindness of wind power regulation. At the same time, it makes the internal logic of the power balance calculation unit more hierarchical and closed-loop, providing core support for the scientific nature of coordinated control commands.

[0064] Of course, the above modules may not be added. This embodiment does not limit this and can be set according to actual usage needs.

[0065] Example 3:

[0066] The output voltage of wind power modules is prone to fluctuations with wind conditions, while the charging and discharging voltage of energy storage modules changes dynamically with the SOC value. Directly feeding dual-source power into the DC bus can easily cause transmission losses or equipment impacts due to voltage mismatch. To solve this problem and enhance the hardware support capability of power distribution, this embodiment proposes a power distribution module architecture consisting of a bidirectional DC / DC converter and a power regulation switch group.

[0067] The two input terminals of the bidirectional DC / DC converter are connected one-to-one with the power output terminals of the wind power module and the energy storage module, respectively, to receive the regulated power of the two types of modules and complete the voltage level adaptation. Its output terminal is connected in series with the input terminal of the power regulation switch group to realize the orderly transmission of the adapted power.

[0068] The output of the power regulation switch group is directly connected to the DC bus, and the controlled end establishes a signal connection with the core control module to receive the coupling ratio parameter in the coordinated control command.

[0069] The bidirectional DC / DC converter can independently adapt to the output voltage of wind power and energy storage, ensuring that dual-source power of different voltage levels can be smoothly integrated into the subsequent link, avoiding power loss or equipment impact caused by voltage mismatch. The power regulation switch group, relying on the linkage with the core control module, can accurately regulate the power output timing and amplitude according to the command, so that the coupled power is fully in line with the DC bus requirements. At the same time, the structured connection between the two allows the power distribution module to form a complete hardware link of voltage adaptation-power regulation-bus output, which greatly improves the stability, compatibility and controllability of power transmission, and provides reliable support for the hardware implementation of coordinated control commands.

[0070] After voltage adaptation, the uneven distribution of the combined current caused by the fluctuation of wind power and the differences in the charging and discharging characteristics of energy storage will lead to the dual-source power. In order to avoid the device overheating or power transmission efficiency reduction caused by excessive local current, optimize the current distribution balance when the dual-source power is combined, and reduce local losses and equipment operation risks during power transmission, a power coupling unit can be further added to the power distribution module.

[0071] The input of the power coupling unit is connected to the bidirectional DC / DC converter, and the output is connected to the power regulation switch group. It receives the wind power after voltage adaptation and the energy storage charging and discharging power. The output is connected to the input of the power regulation switch group to transmit the processed power to the subsequent control stage.

[0072] The power coupling unit has a built-in current sharing resistor network. Its core function is to balance the branch current when the dual-source power is combined through an impedance matching mechanism, so as to avoid the imbalance of the current distribution between the two power branches due to the fluctuation of wind power and the difference in the charging and discharging characteristics of energy storage.

[0073] In this configuration, the current-sharing resistor network can balance the current amplitude of the two branches through impedance matching, so that the wind power and energy storage power can be smoothly integrated in an appropriate ratio. This eliminates the current deviation when the dual-source power is combined, avoids problems such as overheating and accelerated aging of power devices caused by excessive current in local branches, and reduces the risk of equipment operation. At the same time, the balanced current distribution reduces local losses in the power transmission process and improves the energy utilization efficiency of dual-source power coupling. The smooth current fusion process reduces the electrical impact when the power is superimposed, making the coupled power more stable and laying the foundation for the precise control of the subsequent power regulation switch group.

[0074] The power regulation switch group is mainly used to receive coordinated control commands from the core control module, accurately control the timing and amplitude of the coupled power output after voltage adaptation and current sharing processing, and ensure the stability of the DC bus voltage. In this embodiment, there is no limitation on the specific type of equipment selected, such as MOSFET power transistors, thyristors, or integrated power switch modules. To further improve the accuracy of power regulation, dynamic response speed, and adaptability to high-power scenarios, and to better cope with the fluctuation of wind power and the dynamic charging and discharging of energy storage, a power regulation switch group composed of several IGBT power transistors can be selected.

[0075] In this system, the gate of each IGBT power transistor is connected to the core control module, and the drain and source are connected in series between the power coupling unit and the DC bus. The core control module controls the coupled power output by adjusting the duty cycle of the IGBT power transistor.

[0076] In this configuration, the IGBT power transistor possesses the core characteristics of high voltage resistance, high current carrying capacity, and rapid switching response, perfectly adapting to the power level requirements of wind power energy storage systems. The direct connection between the gate and the core control module minimizes control signal transmission delay, and the stepless adjustment of the duty cycle enables continuous and precise control of the coupled power. This allows the power output to the DC bus to match load demands and control commands in real time, effectively mitigating the impact of power fluctuations on the bus voltage. Simultaneously, the series connection structure ensures the stability and reliability of power transmission, further enhancing the end-to-end control efficiency of the power distribution module from voltage adaptation to current balancing to precise control, thus improving the overall operational stability and scenario adaptability of the device. This embodiment only uses this device type as an example for description; other device types can be described with reference to this embodiment and will not be elaborated further here.

[0077] Example 4:

[0078] As a core component of dual-source power voltage adaptation, the bidirectional DC / DC converter is susceptible to a single-point failure that could lead to the interruption of the entire power transmission link, thereby causing DC bus voltage instability. To enhance the fault tolerance and continuity of the device operation, this embodiment proposes to optimize the reliability of the bidirectional DC / DC converter by configuring redundant parallel branches.

[0079] The bidirectional DC / DC converter has built-in redundant parallel branches. The built-in redundant parallel branches and the main circuit branches adopt a parallel topology design. The main circuit branches and the redundant parallel branches adopt a parallel connection method with the input terminals and the output terminals connected together. The two branches exist independently but share the same set of power input and output links. Under normal operating conditions, the main circuit branches are responsible for voltage adaptation, while the redundant parallel branches are in standby mode and do not participate in power transmission, forming a dual guarantee architecture of main circuit operation + branch backup.

[0080] The redundant switching switches connected in series on the redundant parallel branches establish a signal connection between their controlled ends and the core control module, which coordinates the switching control. At the same time, the power input ends of the redundant parallel branches are connected to the wind power modules and energy storage modules, while the power output ends are connected to the input ends of the power coupling units, ensuring that their interfaces are fully compatible with the main circuit branches and can seamlessly undertake the voltage adaptation task of dual-source power.

[0081] The core control module can monitor the operating status of the main circuit branches in real time. When a fault occurs in the main circuit, it can quickly control the redundant switching switch to close, so that the redundant parallel branches can seamlessly take over the work and avoid bus voltage oscillation caused by power transmission interruption. The parallel topology and corresponding interface design of the redundant parallel branches and the main circuit ensure that they do not affect the power adaptation and transmission under normal operating conditions. At the same time, it greatly improves the fault resistance and operational reliability of the bidirectional DC / DC converter and even the entire power distribution module, providing a key guarantee for the long-term stable service of the device.

[0082] During power output, the main circuit branch and redundant parallel branch of a bidirectional DC / DC converter may experience power transmission loss or interference due to electrical signal crosstalk between the two branches and impedance mismatch with subsequent units. To further enhance the anti-interference capability and port adaptability of power transmission, an integrated port adapter unit can be added to the power distribution module.

[0083] The integrated port conversion unit has built-in electromagnetic isolation circuit and power matching circuit. Its input terminal is connected to the output terminal of the main circuit branch and the redundant parallel branch of the bidirectional DC / DC converter, realizing the centralized reception of the output power of the two branches. The output terminal is connected in series with the input terminal of the dynamic impedance matching unit, and the built-in electromagnetic isolation circuit makes the input side (dual branch side) and the output side (impedance matching unit side) electrically isolated.

[0084] The electromagnetic isolation circuit can effectively block the transmission of electrical interference between the input and output sides, prevent abnormal voltage and current waves from affecting subsequent units during branch faults, and ensure equipment safety; the power matching circuit can match the power characteristics of the dual-branch output and the input of the dynamic impedance matching unit, reducing port matching losses; the addition of this unit further improves the hardware link of the power distribution module, making power transmission more anti-interference, safe and efficient, and building a solid port protection barrier for the stable operation of the entire device.

[0085] Example 5:

[0086] As the dual-source power coupling ratio is dynamically adjusted according to the bus voltage status, the fixed impedance characteristics are prone to impedance mismatch during power transmission, causing problems such as power reflection and increased transmission loss. In order to achieve real-time adaptation of coupling ratio and impedance characteristics and further improve power transmission efficiency and stability, a dynamic impedance matching unit can be added to the power distribution module.

[0087] Specifically, the dynamic impedance matching unit is connected in series between the power coupling unit and the power regulation switch group to ensure that the coupled power after current sharing can flow directionally through the unit. The controlled end is connected to the core control module and receives real-time regulation from the core control module.

[0088] The dynamic impedance matching unit has a built-in adjustable impedance network. The adjustable impedance network is used to adjust its equivalent impedance value in real time and dynamically according to the power coupling ratio specified in the coordinated control instructions issued by the core control module, so that the impedance characteristics of the power transmission link are adapted to the current dual-source power coupling ratio, ensuring the smoothness of power transmission.

[0089] In this configuration, the core control module can drive the adjustable impedance network to precisely adjust the equivalent impedance according to the real-time coupling ratio command, ensuring that the power transmission link is always in an impedance-matched state, significantly reducing power reflection loss and improving energy utilization efficiency. The dynamic adaptation feature perfectly matches the dynamic change requirements of the coupling ratio, avoiding power fluctuations caused by impedance mismatch and providing a stable prerequisite for the precise control and output of the power regulation switch group. At the same time, the series design of this unit further improves the full-link optimization architecture of the power distribution module, which includes voltage adaptation, current balancing, impedance matching, and precise control and output, enhancing the controllability and efficiency of power transmission from the impedance perspective.

[0090] This embodiment does not limit the specific implementation of the adjustable impedance network built into the dynamic impedance matching unit. For example, it can be implemented using a sliding rheostat for continuous adjustment, an integrated impedance adjustment chip, or a combination of multiple resistors for switching. To make the impedance adjustment of the dynamic impedance matching unit more precise and controllable, and to make the response faster, this embodiment further proposes a specific structure for the dynamic impedance matching unit.

[0091] Specifically, the dynamic impedance matching unit consists of switchable resistor branches that perform impedance adjustment and an impedance control subunit that coordinates control. Several switchable resistor branches adopt a parallel topology design, with each branch connected in series with an electronic switch (as a control node for branch on / off). The impedance control subunit is responsible for receiving coupling ratio commands and converting them into branch control signals. Finally, by adjusting the on / off state of each branch, it combines the equivalent impedance that matches the coupling ratio.

[0092] All parallel switchable resistor branches are connected as a whole in series between the power coupling unit and the power regulation switch group to ensure that the power after current sharing can flow through the unit to complete impedance matching. The input of the impedance control subunit is directly connected to the core control module to receive the coupling ratio parameter contained in the coordinated control command. Its output is connected to the electronic switch control terminal of each switchable resistor branch. By controlling the electronic switch to open or close, different resistor branches are selected to participate in the work, thereby dynamically adjusting the equivalent impedance of the unit.

[0093] The parallel design of multiple switchable resistor branches can generate various equivalent impedance values ​​through different branch switching combinations, perfectly adapting to the dynamic changes in the dual-source power coupling ratio. The impedance control subunit, as the connection hub between the core control module and the electronic switch, can quickly parse the coupling ratio command and convert it into the on / off signal of the electronic switch, significantly shortening the response time of impedance adjustment. The on / off control method of the electronic switch is reliable and stable, avoiding impedance fluctuations that may occur during continuous adjustment. At the same time, this modular structure makes it easy to add or remove resistor branches according to the actual power level, improving the unit's scenario adaptability and further strengthening the core performance of the dynamic impedance matching unit in terms of accurate adaptation and rapid response, providing solid support for the high efficiency and stability of the power transmission link.

[0094] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing this application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this application.

Claims

1. A DC bus voltage stabilization device for wind power and energy storage coordination, characterized in that, include: Wind power module, energy storage module, core control module, voltage acquisition module, and power distribution module; The acquisition end of the voltage acquisition module is connected in parallel to the DC bus, and the signal output end is connected to the core control module. It is used to acquire the voltage signal of the DC bus in real time and transmit the voltage signal to the core control module. The core control module is connected to the wind power module, the energy storage module, the voltage acquisition module, and the power distribution module, respectively. It is used to detect the voltage status based on the voltage signal, generate coordinated control commands for wind power and energy storage based on the voltage status, and send them to the wind power module, the energy storage module, and the power distribution module. The first input terminal of the power distribution module is connected to the wind power module and is used to receive the regulated power input from the wind power module. The second input terminal is connected to the energy storage module and is used to receive the adjusted charging and discharging power input by the energy storage module; the output terminal is connected to the DC bus and is used to dynamically couple the adjusted power and the charging and discharging power according to the coupling ratio to obtain the coupled power and transmit the coupled power to the DC bus; the coupling ratio is determined according to the coordinated control command.

2. The DC bus voltage stabilization device for wind power and energy storage synergy according to claim 1, characterized in that, The core control module includes: a state determination unit, a power balance calculation unit, and an instruction encoding unit; The state determination unit is used to compare the voltage signal with a preset voltage threshold to determine the voltage state. The power balance calculation unit is used to match the corresponding power regulation coefficient according to the voltage state, and calculate the wind power regulation amount and energy storage charging and discharging amount according to the power regulation coefficient and the voltage state, and determine the power coupling ratio by combining the wind power regulation amount and the energy storage charging and discharging amount. The instruction encoding unit is used to integrate the wind power regulation amount, the energy storage charging and discharging amount and the coupling ratio into a standardized control frame, which serves as the coordinated control instruction.

3. The DC bus voltage stabilization device for wind power and energy storage synergy according to claim 2, characterized in that, The power balance calculation unit includes: a dynamic coefficient matching subunit, an energy storage status receiving subunit, and an adjustment correction subunit; The energy storage status receiving subunit is signal-connected to the energy storage module and is used to acquire the real-time SOC value, terminal voltage and temperature signal of the energy storage module. The input terminal of the dynamic coefficient matching subunit is connected to the state determination unit and the energy storage state receiving subunit, respectively, and is used to dynamically adjust the value of the power regulation coefficient according to the voltage state and the real-time SOC value. The adjustment correction subunit is used to correct the wind power adjustment amount and the energy storage charging and discharging amount based on the adjusted power regulation coefficient, and to determine the coupling ratio based on the correction result.

4. The DC bus voltage stabilization device for wind power and energy storage synergy according to claim 1, characterized in that, The power distribution module includes a bidirectional DC / DC converter and a power regulation switch group; The input terminals of the bidirectional DC / DC converter are connected to the wind power module and the energy storage module, respectively, and the output terminal is connected to the power regulation switch group; The output terminal of the power regulation switch group is connected to the DC bus, and the controlled terminal is connected to the core control module.

5. The apparatus according to claim 4, characterized in that, The power distribution module further includes a power coupling unit; The input terminal of the power coupling unit is connected to the bidirectional DC / DC converter, and the output terminal is connected to the power regulation switch group. The power coupling unit has a built-in current sharing resistor network, which is used to perform current sharing processing on the wind power after regulation and the energy storage charging and discharging power.

6. The apparatus according to claim 5, characterized in that, The power regulation switch group consists of several IGBT power transistors. The gate of each IGBT power transistor is connected to the core control module, and the drain and source are connected in series between the power coupling unit and the DC bus. The core control module controls the coupled power output by adjusting the duty cycle of the IGBT power transistor.

7. The DC bus voltage stabilization device for wind power and energy storage synergy according to claim 4, characterized in that, The bidirectional DC / DC converter has built-in redundant parallel branches; The redundant parallel branch is connected in parallel with the main circuit branch of the bidirectional DC / DC converter, and the redundant parallel branch is connected in series with a redundant switching switch. The controlled terminal of the redundant switching switch is connected to the core control module, the power input terminals of the redundant parallel branches are respectively connected to the wind power module and the energy storage module, and the power output terminals are connected to the input terminals of the power coupling unit.

8. The DC bus voltage stabilization device for wind power and energy storage synergy according to claim 7, characterized in that, The power distribution module also includes an integrated port conversion unit; The integrated port adapter unit has built-in electromagnetic isolation circuit and power matching circuit. The input terminal of the integrated port adapter unit is connected to the output terminals of the main circuit branch and the redundant parallel branch of the bidirectional DC / DC converter. The output terminal is connected in series with the input terminal of the dynamic impedance matching unit, and electrical isolation between the input and output sides is achieved through the electromagnetic isolation circuit.

9. The apparatus according to claim 1, characterized in that, The power distribution module also includes a dynamic impedance matching unit; The dynamic impedance matching unit is connected in series between the power coupling unit and the power regulation switch group, and the controlled end is connected to the core control module. The dynamic impedance matching unit has a built-in adjustable impedance network, which is used to dynamically adjust the equivalent impedance according to the coupling ratio in the coordinated control command.

10. The DC bus voltage stabilization device for wind power and energy storage synergy according to claim 9, characterized in that, The dynamic impedance matching unit includes several switchable resistor branches and impedance control subunits; The switchable resistor branches are connected in parallel, and each branch is connected in series with an electronic switch. The input terminal of the impedance control subunit is connected to the core control module, and the output terminal is connected to the controlled terminal of each electronic switch, which is used to control the on / off state of the corresponding electronic switch according to the coupling ratio.

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