A super-capacitive multi-branch balancing method and system for a network-type static synchronous condenser

Abstract

The present invention provides a method and system for balancing excess capacity multiple branches of a meshed static synchronous condenser, comprising: obtaining current data of each excess capacity branch in the meshed static synchronous condenser; outputting voltage drop data of each excess capacity branch using a proportional-integral controller based on the current data of each excess capacity branch; generating a corrected modulation wave for each excess capacity branch according to the voltage drop data of each excess capacity branch; and performing voltage control on the meshed static synchronous condenser according to the corrected modulation wave for each excess capacity branch. The present application controls the voltage of the meshed static synchronous condenser by performing voltage control on the meshed static synchronous condenser using a corrected modulation wave generated according to the branch voltage drop data output by the proportional-integral controller, and can dynamically adjust the voltage of different excess capacity branches respectively, thereby facilitating reduction of circulating current caused by voltage imbalance, avoiding unnecessary energy loss and overheating, and extending the life of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of network-type static synchronous condensers, and in particular to a super-capacitive multi-branch balancing method and system for a network-type static synchronous condenser. Background Art

[0002] Currently, energy production, consumption, allocation, and utilization are experiencing new development trends, which will bring profound changes to the power system's power structure, load characteristics, grid configuration, technical foundation, and operational characteristics. Grid-connected energy storage technology can simulate the dynamic characteristics and synchronization mechanism of traditional synchronous motors, and has a strong overload capacity. It can provide inertia support to the grid and possesses dynamic active / reactive power support capabilities during faults. It can establish grid voltage in scenarios without traditional synchronous motors and can operate stably even in weak grids. Supercapacitors, as power-type energy storage devices, have high power density and rapid charge and discharge characteristics. They are used as an energy source for inertia support in grid-connected energy storage technology and have broad application prospects.

[0003] Grid-connected static synchronous compensators (STATCOMs) often use supercapacitors as energy storage devices for inertial support. Supercapacitors are often combined with submodules to form supercapacitor modules. These modules are connected in series or parallel to form various STATCOM topologies, including cascaded H-bridge, MMC, and DC-side centralized models.

[0004] An ultracapacitor module generally consists of a half-bridge / full-bridge sub-module + interface circuit + supercapacitor cluster. Due to device capabilities and cost limitations, a single ultracapacitor branch cannot provide sufficient inertia support energy, so multiple ultracapacitor branches need to be connected in parallel. However, connecting multiple ultracapacitor branches in parallel can easily cause DC voltage imbalance, leading to circulating current in each branch and increasing equipment losses. Summary of the Invention

[0005] In order to solve the problem that existing meshed static synchronous condensers based on multiple over-capacity branches are prone to causing DC voltage imbalance, resulting in circulating current between the branches and increasing equipment losses, the present invention proposes a method for over-capacity multi-branch balancing of a meshed static synchronous condenser, comprising:

[0006] Obtain current data of each overcapacity branch in a grid-type static synchronous condenser;

[0007] Based on the current data of each excess capacity branch, using a proportional integral controller, outputting the voltage drop data of each excess capacity branch;

[0008] generating a modified modulation wave for each of the excess-capacity branches according to the voltage drop data of each of the excess-capacity branches;

[0009] The voltage of the grid-type static synchronous condenser is controlled according to the modified modulation waves of the excess-capacity branches.

[0010] Optionally, the outputting the voltage drop data of each excess capacity branch by using a proportional integral controller based on the current data of each excess capacity branch includes:

[0011] Performing difference calculation on the current data of each excess-capacity branch and the pre-calculated target current value to obtain the regulated current value of each excess-capacity branch;

[0012] A proportional-integral controller is used to respectively control the regulated current value of each excess-capacity branch, and output voltage drop data of each excess-capacity branch.

[0013] Optionally, the target current value includes the following calculation process:

[0014] Obtaining DC side current data and the total number of overcapacity branches of the grid-type static synchronous condenser;

[0015] A quotient operation is performed on the DC side current data and the total number of the excess capacity branches to obtain a target current value.

[0016] Optionally, generating a modified modulation wave for each excess-capacity branch according to the voltage drop data of each excess-capacity branch includes:

[0017] The voltage drop data of each excess-capacity branch and a preset reference modulation wave are summed up respectively to obtain a modified modulation wave corresponding to each excess-capacity branch.

[0018] Optionally, the voltage control of the grid-type static synchronous condenser according to the modified modulation wave of each excess-capacitance branch includes:

[0019] determining a target output voltage of the grid-type static synchronous condenser according to the modified modulation waves of the respective over-capacitance branches;

[0020] According to the target output voltage, the voltage of the grid-type static synchronous condenser is controlled by using a pulse width modulation technology.

[0021] Optionally, the voltage control of the grid-type static synchronous condenser using a pulse width modulation technique according to the target output voltage includes:

[0022] performing pulse width modulation on the grid-type static synchronous condenser according to the target output voltage, and outputting a control signal;

[0023] The voltage of the grid-type static synchronous condenser is controlled according to the control signal.

[0024] Based on the same inventive concept, the present invention also provides an ultra-capacitive multi-branch balancing system for a network-type static synchronous condenser, comprising:

[0025] A data acquisition module is used to obtain current data of each overcapacity branch in the grid-type static synchronous condenser;

[0026] an integral control module, configured to output voltage drop data of each excess capacity branch using a proportional integral controller based on the current data of each excess capacity branch;

[0027] a modulation wave correction module, configured to generate a correction modulation wave for each of the excess-capacity branches according to the voltage drop data of each of the excess-capacity branches;

[0028] The voltage control module is used to control the voltage of the grid-type static synchronous phase condenser according to the modified modulation wave of each excess capacity branch.

[0029] Optionally, the integral control module includes:

[0030] a regulating current calculation submodule, configured to perform difference calculation between the current data of each excess-capacity branch and a pre-calculated target current value to obtain a regulating current value of each excess-capacity branch;

[0031] The voltage drop data control submodule is used to use a proportional-integral controller to perform current control on the regulated current value of each excess capacity branch respectively, and output the voltage drop data of each excess capacity branch.

[0032] Optionally, the control current calculation submodule includes:

[0033] A DC data acquisition unit, configured to acquire DC side current data and the total number of over-capacity branches of the grid-type static synchronous condenser;

[0034] The target current calculation unit is used to perform a quotient operation on the DC side current data and the total number of the excess capacity branches to obtain a target current value.

[0035] Optionally, the modulation wave correction module is specifically used to:

[0036] The voltage drop data of each excess-capacity branch and a preset reference modulation wave are summed up respectively to obtain a modified modulation wave corresponding to each excess-capacity branch.

[0037] Optionally, the voltage control module includes:

[0038] a target voltage determination submodule, configured to determine a target output voltage of the grid-type static synchronous condenser according to the modified modulation wave of each over-capacitance branch;

[0039] The output voltage control submodule is used to control the voltage of the grid-type static synchronous phase condenser using a pulse width modulation technique according to the target output voltage.

[0040] Optionally, the output voltage control submodule includes:

[0041] a pulse width modulation unit, configured to perform pulse width modulation on the grid-type static synchronous condenser according to the target output voltage, and output a control signal;

[0042] A target control unit is used to perform voltage control on the grid-type static synchronous phase condenser according to the control signal.

[0043] In another aspect, the present invention further provides an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected via a bus;

[0044] The memory is used to store one or more programs;

[0045] When the one or more programs are executed by the at least one processor, the above-mentioned super-capacitive multi-branch balancing method for a network-type static synchronous condenser is implemented.

[0046] On the other hand, the present invention further provides a computer-readable storage medium having an execution program stored thereon. When the execution program is executed, the above-mentioned super-capacitive multi-branch balancing method for a network-type static synchronous condenser is implemented.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] The present invention provides a method and system for balancing excess capacity multiple branches of a meshed static synchronous condenser, comprising: obtaining current data of each excess capacity branch in the meshed static synchronous condenser; outputting voltage drop data of each excess capacity branch using a proportional-integral controller based on the current data of each excess capacity branch; generating a corrected modulation wave for each excess capacity branch according to the voltage drop data of each excess capacity branch; and performing voltage control on the meshed static synchronous condenser according to the corrected modulation wave for each excess capacity branch. The present application controls the voltage of the meshed static synchronous condenser by performing voltage control on the meshed static synchronous condenser using a corrected modulation wave generated according to the branch voltage drop data output by the proportional-integral controller, and can dynamically adjust the voltage of different excess capacity branches respectively, thereby facilitating reduction of circulating current caused by voltage imbalance, avoiding unnecessary energy loss and overheating, and extending the life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic flow chart of a method for super-capacitive multi-branch balancing of a network-type static synchronous condenser provided by the present invention;

[0050] Figure 2 A schematic diagram of the circuit structure of a meshed static synchronous condenser based on multiple super-capacitance branches in a super-capacitance multi-branch balancing method of a meshed static synchronous condenser provided by the present invention;

[0051] Figure 3 A block diagram of the balancing control of super-capacitive multi-branch circuits in a super-capacitive multi-branch balancing method for a network-type static synchronous condenser provided by the present invention;

[0052] Figure 4 A control block diagram corresponding to an balancing method for a grid-type static synchronous condenser based on super-capacitive two-branch circuits provided in a specific embodiment of the present invention;

[0053] Figure 5 A schematic diagram of the structure of a super-capacitive multi-branch balancing system for a network-type static synchronous condenser provided by the present invention;

[0054] Figure 6 This is a structural diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0055] The present invention provides a super-capacitive multi-branch balancing method, system, device and medium for a network-type static synchronous condenser. The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0056] Example 1:

[0057] The present invention provides a super-capacitive multi-branch balancing method, system, device and medium for a network-type static synchronous condenser. The flow chart is as follows: Figure 1 As shown, including:

[0058] Step 1: Obtain the current data of each overcapacity branch in the grid-type static synchronous condenser;

[0059] Step 2: Based on the current data of each overcapacity branch, use the proportional integral controller to output the voltage drop data of each overcapacity branch;

[0060] Step 3: Generate a modified modulation wave for each excess capacity branch based on the voltage drop data of each excess capacity branch;

[0061] Step 4: Based on the modified modulation wave of each overcapacity branch, voltage control is performed on the grid-type static synchronous condenser.

[0062] Generally, when a grid-type static synchronous condenser contains multiple overcapacity branches connected in parallel or in series, it is easy to generate circulating current, resulting in additional loss in the overcapacity module, which seriously affects the system DC voltage and causes system instability. In order to solve the impact of multiple overcapacity branches, and because the amount of data that can be collected by valve control includes the current of the overcapacity branch and the voltage of the overcapacity branch submodule, the current data of each overcapacity branch in the grid-type static synchronous condenser is used as the control object. Under the premise of not increasing the equipment cost, the design is suitable for Figure 2 The balancing strategy between multiple supercapacitor branches of the grid-type static synchronous condenser shown in the figure; in the figure, the grid-type static synchronous condenser is mainly composed of three parts: supercapacitor branch, phase-controlled branch and bridge arm module; among them, the supercapacitor branch is composed of several supercapacitor modules, and a constant DC voltage control strategy is adopted during normal operation. After the DC voltage is closed-loop controlled by the pole control, a modulation wave is generated. The supercapacitor module includes a supercapacitor (for example, SC), a full-bridge / half-bridge sub-module (for example, SM, SM in the figure) 11 -SM 1N Indicates the submodule composition in the overcapacity branch 1, i SC1 Indicates the current data of the overcapacity branch 1, L SC1 Indicates the inductance of the supercapacitive branch 1; SM 21 -SM 2N Indicates the submodule composition in the overcapacity branch 2, i SC2 Indicates the current data of the overcapacity branch 2, L SC2 Indicates the inductance of the overcapacitance branch 2; N indicates the number of overcapacitance modules; U DC Indicates the DC side voltage; i dc Indicates the DC side current; i dcj Indicates the DC current flowing into the super-capacitor module in the phase-controlled branch), which is used to store and release energy to provide reactive power to support voltage regulation; the phase-controlled branch is mainly composed of full-bridge / half-bridge sub-modules (such as SM a1 -SM a2N Indicates the submodule composition of phase a, u pj Indicates the regulation voltage required on the high voltage side of phase a; i pj Indicates the regulated current output on the high-voltage side of phase a; L a Indicates the inductance of phase a; u nj Indicates the regulation voltage required on the low-voltage side of phase a; i nj Indicates the regulated current output on the low-voltage side of phase a; u sa Indicates the input voltage of phase a; u sb Indicates the b-phase input voltage; u sc Represents the c-phase input voltage) is used to control and convert current to ensure stable output; the bridge arm module is mainly composed of full-bridge / half-bridge sub-modules (such as SM b1 -SM b2NIndicates the submodule composition of phase b; SM c1 -SM c2N Indicates the submodule composition of phase c; i j Indicates the current flowing into phase a of the power grid; L g Indicates the inductance generated by the current flowing into phase a; u gj Represents the voltage of the bridge arm module; o represents the output end, which is the final load connected to the power grid) and is used to convert DC current into AC current for use in the power grid; overall, the diagram shows how to use supercapacitors as energy storage devices, combined with efficient control strategies and modular design, to realize the functions of grid-type static synchronous phase regulators in providing reactive power and voltage support.

[0063] Based on the above-mentioned grid-type static synchronous condenser, the problem of DC voltage imbalance during operation is solved by balancing and controlling each excess capacity branch therein. Specifically, it is first necessary to collect current data of each excess capacity branch. For example, the current data of each excess capacity branch in the above-mentioned step 1 can be obtained through a current sensor (for example, it can be directly measured using a current transformer or a Hall effect sensor), a digital signal processing unit (for example, an analog-to-digital converter can be used to convert the analog current signal collected by the sensor into a digital signal for processing to obtain the current data of each excess capacity branch) or a communication protocol.

[0064] The current data of each overcapacity branch not only reflects its current operating status but also provides information for comparison with the target current. This lays the foundation for the implementation of subsequent control strategies. After completing the accurate collection of current data for each overcapacity branch, the next key step is how to use this data to achieve balanced control of the overcapacity branches to resolve DC voltage imbalance problems that may arise during operation. Specifically:

[0065] In one implementation, the process of outputting the voltage drop data of each excess capacity branch using a proportional-integral controller based on the current data of each excess capacity branch in step 2 may include:

[0066] The current data of each excess capacity branch (for example, i SCn The current data of the excess capacity branch n) and the pre-calculated target current value (for example, i dc / n represents) to perform difference calculation to obtain the control current value of each excess capacity branch;

[0067] Use the proportional integral controller (also known as PI controller) to control the current value of each over-capacity branch and output the voltage drop data of each over-capacity branch (for example, U diff express);

[0068] In this implementation, effective current balancing control of the overcapacity branches is achieved by accurately collecting and processing the current data of each overcapacity branch, combined with the application of a proportional-integral controller. Specifically, by calculating the difference between the real-time current data of each overcapacity branch and the preset target current value, the regulated current value of each branch can be clearly identified, providing basic information for subsequent current control. Using a PI controller to feedback control these regulated current values ​​can dynamically adjust the voltage drop data of each branch, ensuring that each overcapacity branch always maintains an ideal operating state. This implementation has significant technical benefits, mainly reflected in the following aspects: First, real-time monitoring and adjustment of the current of each overcapacity branch can effectively improve the system's DC voltage imbalance and enhance the overall system power quality and stability. Second, the use of the PI controller enhances the system's adaptability to changing external conditions, ensuring that the overcapacity branch can quickly respond to load fluctuations and other environmental changes, thereby maintaining the system's balanced state. In addition, this implementation also improves system reliability, optimizes operational efficiency, and extends the service life of the equipment, ultimately enhancing the functionality and flexibility of grid-type static synchronous condensers in power systems.

[0069] In this implementation, the target current value may include the following calculation process:

[0070] Obtain the DC side current data and the total number of over-capacity branches of the grid-type static synchronous condenser;

[0071] The DC side current data is divided by the total number of overcapacity branches to obtain the target current value. In this implementation method, the process of calculating the target current value further enhances the control capability of the grid-type static synchronous condenser and the overall efficiency of the system. Specifically, the DC side current data of the grid-type static synchronous condenser and the total number of overcapacity branches are first obtained. This process provides the necessary input data for calculating the target current value. By dividing the DC side current data by the total number of overcapacity branches, the ideal current value that each overcapacity branch should bear can be obtained. This target current calculation method based on the actual DC current and the number of branches enables each overcapacity branch to achieve more accurate current distribution when the load changes. Furthermore, this current balancing implementation method effectively reduces the current deviation between each branch and helps to solve the problem of DC voltage imbalance. Therefore, the introduction of this calculation method in this implementation method not only improves the system's adaptability in dynamic environments, but also optimizes the working state of each overcapacity branch, ensuring that all branches operate smoothly on the basis of balanced current. Ultimately, by using this target current value, combined with the control strategy of the aforementioned PI controller, a more efficient and reliable balanced control effect can be achieved, which improves the overall performance of the grid-type static synchronous condenser and the stability of the power system, while reducing the risk of failure and improving the system's safety and operational flexibility.

[0072] After successfully obtaining and adjusting the control current values ​​of each overcapacity branch through the above implementation method, the next key step is to effectively convert these control current values ​​into actual control signals to adapt to the dynamic needs of the system. This process is performed by the proportional-integral controller, which not only performs real-time feedback control based on the current deviation, but also outputs the voltage drop data of each branch. These voltage drop data not only provide a basis for the performance optimization of each overcapacity branch, but also enable us to have a deeper understanding of the operating status of the system. With the voltage drop data of each overcapacity branch, the transmission of the control signal can be further optimized. Specifically, based on these voltage drop data, a corresponding corrected modulation wave can be generated for each overcapacity branch to ensure that each branch achieves the expected performance indicators during the current control process. Specifically:

[0073] In one implementation, the process of generating the modified modulation wave of each excess-capacity branch based on the voltage drop data of each excess-capacity branch in step 3 may include:

[0074] The voltage drop data of each excess capacity branch and the preset reference modulation wave are summed up to obtain the corresponding modified modulation wave of each excess capacity branch (for example, the modified modulation wave of excess capacity branch n can be obtained by using U screfn express).

[0075] In this implementation, by summing the voltage drop data of each overcapacity branch with a pre-set reference modulation wave to generate a corresponding corrected modulation wave, the control accuracy and dynamic response capability of a grid-type static synchronous condenser in a power system can be significantly improved. This method ensures current balance in the overcapacity branches during power transmission, effectively avoiding energy loss due to voltage drop, thereby optimizing the overall system's operating efficiency. Furthermore, the generation of a corrected modulation wave enables each overcapacity branch to dynamically adjust to its actual operating conditions, improving the flexibility and adaptability of the control strategy. Compared to existing technologies, this implementation not only optimizes operating conditions through more precise modulation signals but also introduces a deep feedback mechanism for real-time current control, enabling overcapacity branches to respond quickly to load fluctuations and ensuring system stability and reliability. This correction method, combining voltage drop data with a reference modulation wave, not only improves the power quality of the power system but also provides a more effective response strategy for various variables that may arise in actual applications, thereby providing a more robust solution in complex power environments.

[0076] After generating the corrected modulation waves for each overcapacitance branch through the above implementation method, these corrected signals will provide an important basis for the implementation of voltage control. By combining the voltage drop data of each overcapacitance branch with the pre-set reference modulation wave, it can not only provide a more accurate regulation signal for the system, but also ensure that each branch always performs at its best under different operating conditions. The key to this process is to ensure that the corrected modulation wave can accurately reflect the actual current demand, thus laying a solid foundation for subsequent voltage control strategies. Next, we will detail how to perform voltage control on a grid-type static synchronous condenser based on these corrected modulation waves. Specifically:

[0077] In one implementation, the process of performing voltage control on the grid-type static synchronous condenser according to the modified modulation wave of each excess-capacitance branch in step 4 may include:

[0078] According to the modified modulation wave of each overcapacitance branch, the target output voltage of the grid-type static synchronous condenser is determined;

[0079] According to the target output voltage, the pulse width modulation technology is used to control the voltage of the grid-type static synchronous condenser.

[0080] In this implementation, the grid-type static synchronous condenser voltage is controlled based on the modified modulation wave of each overcapacitance branch, achieving precise regulation of the system output voltage, significantly improving the stability and reliability of the entire power system. Utilizing pulse width modulation technology, it can quickly and flexibly respond to load changes, ensuring that the output voltage of the grid-type static synchronous condenser remains within the ideal range under different operating conditions. This precise voltage control mechanism not only optimizes power transmission efficiency and reduces equipment losses caused by voltage fluctuations, but also improves system adaptability while reducing the risk of failure. Therefore, this implementation, by dynamically adjusting the target output voltage through the modified modulation wave, enables the system to quickly respond to transient changes and maintain stable electrical characteristics. Compared with traditional control technologies, this implementation can effectively reduce the amplitude of voltage fluctuations, avoiding equipment damage and efficiency reduction caused by current imbalance.

[0081] In this implementation, the process of controlling the voltage of the grid-type static synchronous condenser using the pulse width modulation technology according to the target output voltage may specifically include:

[0082] According to the target output voltage, pulse width modulation is performed on the grid-type static synchronous condenser to output a control signal;

[0083] The voltage of the grid-type static synchronous condenser is controlled according to the control signal. In this implementation, the technical solution of pulse width modulation (PWM) of the grid-type static synchronous condenser to achieve voltage control significantly improves the control accuracy and response speed of the system. The application of PWM technology enables the output control signal to finely adjust the voltage, thereby achieving precise driving of the power equipment. This process ensures that the grid-type static synchronous condenser can quickly adjust the output voltage to meet the real-time needs of the power grid when the load changes instantaneously, effectively reducing the impact of voltage fluctuations on system stability.

[0084] In summary, the present invention addresses the problem that existing grid-type static synchronous condensers based on multiple over-capacity branches are prone to causing DC voltage imbalance, resulting in the formation of circulating currents between the branches, thereby increasing equipment losses. A method for over-capacity multi-branch balancing of a grid-type static synchronous condenser is proposed. Through a series of orderly steps, current management and voltage control of each over-capacity branch in the grid-type static synchronous condenser are achieved, aiming to improve the control accuracy and stability of the power system. Figure 3 As shown, first, the current data i is obtained from each overcapacity branch scn , as the basic data, reflects the current working status. The accurate collection of this data is the key to subsequent control and directly affects the response speed and energy efficiency of the system. Next, combined with the target current value (i dc / nUse the proportional integral controller to process the current data and output the corresponding voltage drop data U diff This process compares the real-time current with the pre-set target current to calculate the regulated current value, which is then used as the basis for voltage regulation. This feedback mechanism ensures that the current of each over-capacity branch remains in an ideal operating state during power transmission, thereby significantly reducing the energy loss caused by voltage drop. In the process of generating the corrected modulation wave, the voltage drop data of each over-capacity branch is summed with the preset reference modulation wave to generate the corrected modulation wave U for each over-capacity branch. screfn , ensuring that the output voltage signal can reflect the actual demand. This process makes the voltage control not only rely on the static reference value, but also dynamically adapt to the real-time changes in the system operation. Finally, the pulse width modulation technology is used to realize the response voltage control of the grid-type static synchronous phase condenser. According to the corrected target output voltage, the control signal is output to further adjust the voltage. This technical means enables the system to quickly adapt to different load conditions and ensure the safety and stability of power transmission. Overall, the method of the present invention can suppress the circulating current of the over-capacity branch within a reasonable range and balance the voltage of each branch module without adding additional electrical equipment and control interfaces. It not only provides a practical and effective solution with relatively simple engineering implementation for the problem of precise control between current and voltage, but also has flexible real-time response capabilities, which can improve the performance and reliability of the grid-type static synchronous phase condenser. By combining intelligent feedback mechanism and efficient control means, it provides a solid foundation for the intelligent and automated development of future power systems, and has broad application prospects and practical value.

[0085] Example 2:

[0086] In order to better understand the over-capacity multi-branch balancing method of a meshed static synchronous condenser proposed in the present invention, taking two over-capacity branches as an example, DC voltage balance can also be achieved by controlling the circulating current in the meshed static synchronous condenser. Specifically, the balancing control block diagram between the two over-capacity branches is shown in FIG. Figure 4 As shown, according to the current i of the two excess capacity branches sc1 ,i sc2 , subtract the two and divide by 2 to get the circulation flow i loop , change i loop Comparing with the reference value 0, the unbalanced pressure drop U is obtained through the PI controller. diff , and finally with the reference modulation wave U dcref Add and subtract to get the modulation wave U of the two excess capacity branches after adjustment. scref1 , U scref2 ;

[0087] In this embodiment, by obtaining the current data of the excess capacity branch in real time, sc1and i sc2 , combining these two data to calculate the circulation flow i loop Circulation refers to the loop current formed by current imbalance in multiple branches. This imbalance will directly affect the stability of voltage. In order to maintain the voltage balance of the system, in this embodiment, i loop Comparing with the reference value 0, this process can identify whether the current system is in a balanced state. Then, the PI controller is used to adjust the circulation flow. Through the feedback mechanism of the controller, the system can output the unbalanced pressure drop U diff , U diff It reflects the difference between the current state of the system and the expected state, and is an important basis for adjusting the final control signal. diff The value of the target reference modulation wave U dcref Add or subtract to generate the modulation wave U used to control the two excess capacity branches respectively. scref1 and U scref2 The output of this modulated wave directly affects the system's reference voltage, laying the foundation for further voltage regulation. In summary, this specific embodiment demonstrates that the method of the present invention can improve the dynamic response capability of a grid-type static synchronous condenser to voltage balance. Through real-time monitoring and control of circulating current, the system can quickly adapt to load changes, effectively avoiding failures and losses in power equipment caused by current imbalance. Furthermore, the introduction of the PI control strategy improves the accuracy of voltage regulation, ensuring the efficient transmission and use of electrical energy.

[0088] Example 3:

[0089] The present invention based on the same inventive concept also provides a super-capacitive multi-branch balancing system for a network-type static synchronous condenser, the structural composition diagram of which is shown in FIG. Figure 5 As shown, including:

[0090] A data acquisition module is used to obtain current data of each overcapacity branch in the grid-type static synchronous condenser;

[0091] An integral control module, configured to output voltage drop data of each excess capacity branch using a proportional integral controller based on current data of each excess capacity branch;

[0092] A modulation wave correction module is used to generate a correction modulation wave for each excess capacity branch according to the voltage drop data of each excess capacity branch;

[0093] The voltage control module is used to control the voltage of the grid-type static synchronous phase condenser according to the modified modulation wave of each over-capacity branch.

[0094] In one implementation, the above-mentioned integral control module may include:

[0095] The control current calculation submodule is used to perform difference calculation between the current data of each excess capacity branch and the pre-calculated target current value to obtain the control current value of each excess capacity branch;

[0096] The voltage drop data control submodule is used to use a proportional-integral controller to perform current control on the regulated current value of each excess capacity branch and output the voltage drop data of each excess capacity branch.

[0097] In this implementation, the above-mentioned control current calculation submodule may include:

[0098] A DC data acquisition unit is used to obtain DC side current data of the grid-type static synchronous condenser and the total number of over-capacity branches;

[0099] The target current calculation unit is used to perform a quotient operation on the DC side current data and the total number of overcapacity branches to obtain a target current value.

[0100] In one implementation, the above-mentioned modulated wave correction module is specifically used to:

[0101] The voltage drop data of each excess-capacity branch and a preset reference modulation wave are summed up to obtain a corrected modulation wave corresponding to each excess-capacity branch.

[0102] In one implementation, the voltage control module may include:

[0103] A target voltage determination submodule is used to determine the target output voltage of the grid-type static synchronous condenser according to the modified modulation wave of each overcapacitance branch;

[0104] The output voltage control submodule is used to control the voltage of the grid-type static synchronous phase condenser using pulse width modulation technology according to the target output voltage.

[0105] In this implementation, the output voltage control submodule may include:

[0106] A pulse width modulation unit is used to perform pulse width modulation on the grid-type static synchronous condenser according to the target output voltage and output a control signal;

[0107] The target control unit is used to control the voltage of the grid-type static synchronous phase condenser according to the control signal.

[0108] Example 4:

[0109] like Figure 6As shown, the present invention also provides an electronic device, which may be a computer, a single-chip microcomputer, a smart mobile device, or the like. The electronic device in this embodiment may include a processor, a memory, a transceiver component, and the like. The memory, processor, and transceiver component are connected via a bus; the memory may be used to store an execution program, which may include instructions; and the processor may be used to execute the instructions stored in the memory. The memory may also be used to store data, which may be accessed and / or modified during the execution of the instructions.

[0110] The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in a storage medium to implement corresponding method processes or corresponding functions, so as to implement the steps of the ultra-capacitive multi-branch balancing method of a meshed static synchronous condenser in the above-mentioned embodiment.

[0111] Example 5:

[0112] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device-readable storage medium (Memory). This electronic device-readable storage medium is a memory device within the electronic device, used to store programs and data. It is understood that the storage medium herein may include both built-in storage media within the electronic device and, of course, 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 being loaded and executed by a processor. These instructions may be one or more executable programs (including program code). It should be noted that the storage medium herein may be high-speed RAM memory or non-volatile memory, such as at least one disk storage device. The processor loading and executing the one or more instructions stored in the storage medium can implement the steps of the super-capacitive multi-branch balancing method for a meshed static synchronous condenser in the above-described embodiment.

[0113] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0114] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts 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, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0115] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0116] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art may 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 pending claims.

Claims

1. A super-capacitive multi-branch balancing method for a grid-type static synchronous condenser, characterized in that: include: Obtain current data of each overcapacity branch in a grid-type static synchronous condenser; Based on the current data of each excess capacity branch, using a proportional integral controller, outputting the voltage drop data of each excess capacity branch; generating a modified modulation wave for each of the excess-capacity branches according to the voltage drop data of each of the excess-capacity branches; The voltage of the grid-type static synchronous condenser is controlled according to the modified modulation waves of the excess-capacity branches.

2. The method according to claim 1, wherein The method of outputting voltage drop data of each excess capacity branch by using a proportional integral controller based on the current data of each excess capacity branch comprises: Performing difference calculation on the current data of each excess-capacity branch and the pre-calculated target current value to obtain the regulated current value of each excess-capacity branch; A proportional-integral controller is used to respectively control the regulated current value of each excess-capacity branch, and output voltage drop data of each excess-capacity branch.

3. The method according to claim 2, wherein The target current value includes the following calculation process: Obtaining DC side current data and the total number of overcapacity branches of the grid-type static synchronous condenser; A quotient operation is performed on the DC side current data and the total number of the excess capacity branches to obtain a target current value.

4. The method according to claim 1, wherein Generating a modified modulation wave for each of the excess-capacity branches according to the voltage drop data of each of the excess-capacity branches includes: The voltage drop data of each excess-capacity branch and a preset reference modulation wave are summed up respectively to obtain a modified modulation wave corresponding to each excess-capacity branch.

5. The method according to claim 1, wherein The voltage control of the grid-type static synchronous condenser according to the modified modulation wave of each excess-capacitance branch includes: determining a target output voltage of the grid-type static synchronous condenser according to the modified modulation waves of the respective over-capacitance branches; According to the target output voltage, the voltage of the grid-type static synchronous condenser is controlled by using a pulse width modulation technology.

6. The method according to claim 5, wherein The voltage control of the grid-type static synchronous condenser using a pulse width modulation technique according to the target output voltage includes: performing pulse width modulation on the grid-type static synchronous condenser according to the target output voltage, and outputting a control signal; The voltage of the grid-type static synchronous condenser is controlled according to the control signal.

7. A super-capacitive multi-branch balancing system for a grid-type static synchronous condenser, characterized in that: include: A data acquisition module is used to obtain current data of each overcapacity branch in the grid-type static synchronous condenser; an integral control module, configured to output voltage drop data of each excess capacity branch using a proportional integral controller based on the current data of each excess capacity branch; a modulation wave correction module, configured to generate a correction modulation wave for each of the excess-capacity branches according to the voltage drop data of each of the excess-capacity branches; The voltage control module is used to control the voltage of the grid-type static synchronous phase condenser according to the modified modulation wave of each excess capacity branch.

8. The system according to claim 7, wherein: The integral control module includes: a regulating current calculation submodule, configured to perform difference calculation between the current data of each excess-capacity branch and a pre-calculated target current value to obtain a regulating current value of each excess-capacity branch; The voltage drop data control submodule is used to use a proportional-integral controller to perform current control on the regulated current value of each excess capacity branch respectively, and output the voltage drop data of each excess capacity branch.

9. An electronic device, characterized in that: include: at least one processor and 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, the ultra-capacitive multi-branch balancing method for a meshed static synchronous condenser according to any one of claims 1 to 6 is implemented.

10. A computing device readable storage medium, characterized in that: An execution program is stored thereon, and when the execution program is executed, an ultra-capacitive multi-branch balancing method for a meshed static synchronous condenser according to any one of claims 1 to 6 is implemented.

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