Super-capacitance multi-branch equalization method and system for network-forming type static synchronous phase modifier

Abstract

The invention provides a super-capacitance multi-branch equalization method and system for a network-forming type static synchronous phase modifier. The method comprises the following steps: acquiring current data of each super-capacitance branch in the network-forming type static synchronous phase modifier; based on the current data of each super-capacitance branch, outputting voltage drop data of each super-capacitance branch by using a proportional-integral controller; according to the voltage drop data of each super-capacitance branch, generating a correction modulation wave of each super-capacitance branch; according to the correction modulation waves of all the super-capacitance branches, voltage control is carried out on the net-forming type static synchronous phase modifier; according to the invention, the voltage control is carried out on the network-forming type static synchronous phase modifier through the correction modulation wave generated according to the branch voltage drop data output by the proportional-integral controller, and the dynamic adjustment can be respectively carried out for the voltages of different super-capacitance branches, thereby facilitating the reduction of a circulation phenomenon caused by voltage imbalance, and improving the reliability of the network-forming type static synchronous phase modifier. And unnecessary energy loss and overheating can be avoided, and the service life of equipment is prolonged.

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] At present, energy production, consumption, allocation and utilization present new development trends, which will bring profound new changes to the power supply structure, load characteristics, grid form, technical foundation and operation characteristics of the power system. Grid-type energy storage technology can simulate the dynamic characteristics and synchronization mechanism of traditional synchronous motors, and has strong overload capacity, can provide inertia support to the grid, and has dynamic active / reactive support capabilities during fault processes. It can establish grid voltage in scenarios without traditional synchronous machines and can also operate stably in weak grids. Supercapacitors, as power-type energy storage devices, have high power density and fast charging and discharging characteristics. They are used as an energy source for inertia support in grid-type energy storage technology and have broad application prospects.

[0003] Grid-Connected Static Synchronous Compensator (STATCOM) often uses supercapacitors as energy storage devices for inertial support. When supercapacitors are used, they are often combined with submodules to form supercapacitor modules. Supercapacitor modules are connected in series or parallel to form various types of grid-connected static synchronous condenser topologies, including cascaded H-bridge type, MMC type, DC side centralized type, etc.

[0004] The supercapacitor module is generally composed of a half-bridge / full-bridge sub-module + interface circuit + supercapacitor cluster. Due to the limitations of device capabilities and costs, a single supercapacitor branch cannot provide sufficient inertia support energy, so multiple supercapacitor branches need to be connected in parallel. However, multiple supercapacitor branches connected in parallel can easily cause DC voltage imbalance, resulting in circulating currents in each branch, thereby increasing equipment losses. Summary of the invention

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

[0006] Obtain the current data of each over-capacity branch in the 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 of each of the over-capacity branches according to the voltage drop data of each of the over-capacity branches;

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

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

[0011] The current data of each excess capacity branch is respectively calculated by subtracting 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 the 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 over-capacity branches of the grid-type static synchronous condenser;

[0015] The DC side current data is divided by the total number of the over-capacity branches to obtain a target current value.

[0016] Optionally, generating a modified modulation wave of each of the excess-capacitance branches according to the voltage drop data of each of the excess-capacitance branches 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 phase condenser is performed according to the modified modulation wave of each over-capacitance branch, including:

[0019] Determining the target output voltage of the grid-type static synchronous condenser according to the modified modulation wave of each over-capacitance branch;

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

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

[0022] According to the target output voltage, pulse width modulation is performed on the grid-type static synchronous phase condenser to output a control signal;

[0023] The voltage of the grid-type static synchronous phase 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, used to acquire current data of each over-capacity branch in a grid-type static synchronous condenser;

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

[0027] A modulation wave correction module, used for generating a correction modulation wave of 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 over-capacitance branch.

[0029] Optionally, the integral control module includes:

[0030] A regulating current calculation submodule, used for performing difference calculation between the current data of each excess capacity branch and the pre-calculated target current value, to obtain the 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 over-capacity branch respectively, and output the voltage drop data of each over-capacity branch.

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

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

[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 over-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, used to determine the 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 by 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, used to perform pulse width modulation on the grid-type static synchronous phase 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, and when the execution program is executed, the super-capacitive multi-branch balancing method of a meshed static synchronous phase condenser as described above is implemented.

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

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

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

[0052] Figure 4 A control block diagram corresponding to an balancing method of a network-type static synchronous condenser based on super-capacitor two-branch 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 of a network-type static synchronous condenser provided by the present invention;

[0054] Figure 6 The present invention provides a schematic structural diagram of an electronic device. 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 implementation methods of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0056] Embodiment 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 current data of each over-capacity branch in the grid-type static synchronous condenser;

[0059] Step 2: Based on the current data of each over-capacity branch, a proportional-integral controller is used to output the voltage drop data of each over-capacity branch;

[0060] Step 3: Generate a modified modulation wave of each overcapacity branch according to the voltage drop data of each overcapacity branch;

[0061] Step 4: Based on the modified modulation wave of each over-capacity branch, voltage control is performed on the grid-type static synchronous phase 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 of the overcapacity module, which seriously affects the system DC voltage and causes system instability. In order to solve the impact of overcapacity multiple 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 taken 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 super-capacitor 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: super-capacitor branch, phase-controlled branch and bridge arm module; among them, the super-capacitor branch is composed of several super-capacitor modules, and a fixed 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 super-capacitor module includes a supercapacitor (for example, it can be represented by SC), a full-bridge / half-bridge sub-module (for example, it can be represented by 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 supercapacitor 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 represents the inductance of the super-capacitance branch 2; N represents the number of super-capacitance modules; U DC Indicates the DC side voltage; i dc Indicates the DC side current; i dcj represents 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 represents 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 Represents the submodule composition of phase c; i j Indicates the current flowing into phase a of the power grid; L g represents 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 phase regulator, the problem of DC voltage imbalance during operation is solved by balancing and controlling each over-capacity branch therein. Specifically, it is first necessary to collect current data of each over-capacity branch. For example, the current data of each over-capacity branch in the above 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 over-capacity branch) or a communication protocol.

[0064] The current data of each overcapacity branch can not only reflect its current working status, but also provide information for comparing the target current, which lays the foundation for the implementation of the subsequent control strategy. After completing the accurate collection of the current data of each overcapacity branch, the next key step is how to use this data to achieve balanced control of the overcapacity branch to solve the DC voltage imbalance problem that may occur during operation. Specifically:

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

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

[0067] A proportional integral controller (also called a PI controller) is used 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, by accurately collecting and processing the current data of each overcapacity branch and combining the application of proportional integral controller, effective balanced control of the current of the overcapacity branch is achieved. 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, which provides basic information for subsequent current control; by using the PI controller to feedback control these regulated current values, the voltage drop data of each branch can be dynamically adjusted to ensure that each overcapacity branch always maintains an ideal working state. The technical effect of this implementation is significant, mainly reflected in the following aspects: First, real-time monitoring and adjustment of the current of each overcapacity branch can effectively improve the DC voltage imbalance problem of the system and improve the power quality and stability of the overall system; secondly, the use of PI controller enhances the system's adaptability to changes in external conditions, ensuring that the overcapacity branch can respond quickly when the load fluctuates and other environmental changes, thereby maintaining the balance of the system; in addition, this implementation also improves the reliability of the system to a certain extent, optimizes the operating efficiency, and extends the service life of the equipment, ultimately improving the functionality and flexibility of the grid-type static synchronous condenser in the power system.

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

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

[0071] The DC side current data is divided by the total number of overcapacity branches to obtain the target current value; in this implementation, the control capability of the grid-type static synchronous condenser and the overall efficiency of the system are further enhanced by calculating the target current value. 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. In addition, this current balancing implementation method effectively reduces the current deviation between each branch and helps solve the problem of DC voltage imbalance. Therefore, the introduction of this calculation method in this implementation not only improves the adaptability of the system in a dynamic environment, but also optimizes the working state of each overcapacity branch, ensuring that all branches operate smoothly on the basis of balanced current. Finally, by using this target current value and combining it 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-connected static synchronous phase condenser and the stability of the power system, while reducing the risk of failure and improving the safety of the system and the flexibility of operation.

[0072] After successfully obtaining and adjusting the control current value 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 a 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 according to the voltage drop data of each excess capacity branch in the above step 3 may include:

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

[0075] In this implementation, by summing the voltage drop data of each overcapacity branch with the preset reference modulation wave, the corresponding modified modulation wave is generated, which can significantly improve the control accuracy and dynamic response capability of the grid-type static synchronous condenser in the power system. The implementation of this method ensures the current balance of the overcapacity branch during the power transmission process, effectively avoids the power loss caused by the voltage drop, and thus optimizes the operation efficiency of the overall system. In addition, the generation of the modified modulation wave enables each overcapacity branch to dynamically adjust according to its actual operating conditions, improving the flexibility and adaptability of the control strategy. Compared with the prior art, this implementation not only optimizes the operating state through a more accurate modulation signal, but also introduces a deep feedback mechanism for real-time current control, so that the overcapacity branch can respond quickly when facing load fluctuations, ensuring the stability and reliability of the system. This correction method combining the voltage drop data and the 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 appear in practical applications, thereby providing a more solid solution in a complex power environment.

[0076] After the correction modulation waves of each overcapacity branch are generated through the above implementation method, these correction signals will provide an important basis for the implementation of voltage control. By combining the voltage drop data of each overcapacity branch with the pre-set reference modulation wave, it can not only provide the system with a more accurate adjustment signal, but also ensure that the performance of each branch is always in the best state under different operating conditions. The key to this process is to ensure that the correction modulation wave can accurately reflect the actual demand of the current, thereby laying a solid foundation for the subsequent voltage control strategy. Next, we will introduce in detail how to control the voltage of the grid-type static synchronous phase condenser based on these correction 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 over-capacitance branch in step 4 may include:

[0078] According to the modified modulation wave of each over-capacitance 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 phase condenser;

[0080] In this implementation, the voltage of the grid-type static synchronous condenser is controlled according to the modified modulation wave of each over-capacity branch, so as to achieve precise adjustment of the system output voltage, thereby significantly improving the stability and reliability of the entire power system. By using pulse width modulation technology, it can respond quickly and flexibly to load changes, ensuring that under different operating conditions, the output voltage of the grid-type static synchronous condenser is always maintained within the ideal range. This fine voltage control mechanism not only optimizes the transmission efficiency of electric energy and reduces equipment losses caused by voltage fluctuations, but also improves the adaptability of the system while reducing the risk of failure. Therefore, this implementation method can dynamically adjust the target output voltage by correcting the modulation wave, so that the system can respond quickly to transient changes and maintain stable electrical characteristics. Compared with traditional control technology, this implementation method can effectively reduce the amplitude of voltage fluctuations and avoid 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 by 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 phase condenser to output a control signal;

[0083] According to the control signal, the voltage of the grid-type static synchronous phase condenser is controlled; in this implementation, the technical solution of pulse width modulation (PWM) of the grid-type static synchronous phase 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 phase 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 aims at the problem that the existing grid-type static synchronous condenser based on multiple over-capacity branches is prone to cause DC voltage imbalance, resulting in the formation of circulating current between the branches, thereby increasing equipment loss. A method for over-capacity multi-branch balancing of a grid-type static synchronous condenser is proposed. Through a series of orderly steps, the current management and voltage control of each over-capacity branch in the grid-type static synchronous condenser are realized, 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 overcapacitance 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 preset target current to calculate the control current value, and uses this as the basis for voltage control. Through this feedback mechanism, it can ensure that the current of each overcapacity 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 overcapacity branch is summed with the preset reference modulation wave, and the corrected modulation wave U of each overcapacity branch is generated in this way. 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 of 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 precise control problem 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, and by combining intelligent feedback mechanism with 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] Embodiment 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, the 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 as follows: Figure 4 As shown, according to the current i of the two overcapacitance branches sc1 ,i sc2 , subtract the two and divide by 2 to get the circulation flow i loop , change i loop Compared 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 over-capacitance branches after adjustment. scref1 , U scref2 ;

[0087] In this embodiment, by obtaining the current data of the overcapacity branch in real time, sc1and i sc2 , combining these two data to calculate the circulation flow i loop Circulating current 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 By comparing with the reference value 0, this process can identify whether the current system is in a balanced state. Then, the circulation flow is adjusted using the PI controller. 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 dcref Add or subtract to generate the modulation wave U used to control the two super-capacitance branches respectively. scref1 and U scref2 The output of this modulation wave directly affects the reference voltage of the system, laying the foundation for further voltage regulation. In summary, this specific embodiment can illustrate that the method of the present invention can improve the dynamic response capability of the grid-type static synchronous phase condenser to voltage balance. Through real-time monitoring and control of circulating current, the system can quickly adapt to changes in load, thereby effectively avoiding failures and losses of power equipment caused by current imbalance. In addition, the introduction of the PI control strategy improves the accuracy of voltage regulation and ensures the efficient transmission and use of electric energy.

[0088] Embodiment 3:

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

[0090] A data acquisition module, used to acquire current data of each over-capacity branch in a grid-type static synchronous condenser;

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

[0092] A modulation wave correction module, used to generate a correction modulation wave of each overcapacity branch according to the voltage drop data of each overcapacity 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 over-capacity branch and the pre-calculated target current value to obtain the control current value of each over-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 over-capacity branch and output the voltage drop data of each over-capacity branch.

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

[0098] A DC data acquisition unit, used to acquire DC side current data of a grid-forming 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 over-capacity branches to obtain a target current value.

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

[0101] 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.

[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 over-capacitance 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 phase 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] Embodiment 4:

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

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

[0111] Embodiment 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), which is a memory device in the electronic device for storing programs and data. It can be understood that the storage medium here can include both the built-in storage medium in the electronic device and the extended storage medium supported by the electronic device. The storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more execution programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor loads and executes one or more instructions stored in the storage medium, which can implement the steps of a super-capacitive multi-branch balancing method of a network-type static synchronous condenser in the above embodiment.

[0113] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, 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 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 flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, 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 flowchart and / or block diagram. 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 capable of directing a computer or other programmable data processing device to operate 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 A 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 operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified 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 rather than to limit its protection scope. 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 can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A super-capacitive multi-branch balancing method for a network-type static synchronous condenser, characterized in that: include: Obtain the current data of each over-capacity branch in the 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 of each of the over-capacity branches according to the voltage drop data of each of the over-capacity branches; The voltage of the grid-type static synchronous phase condenser is controlled according to the modified modulation waves of the excess-capacitance branches.

2. The method according to claim 1, characterized in that The method of outputting the voltage drop data of each overcapacity branch by using a proportional-integral controller based on the current data of each overcapacity branch comprises: The current data of each excess capacity branch is respectively calculated by subtracting 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 the voltage drop data of each excess capacity branch.

3. The method according to claim 2, characterized in that The target current value includes the following calculation process: Obtaining DC side current data and the total number of over-capacity branches of the grid-type static synchronous condenser; The DC side current data is divided by the total number of the over-capacity branches to obtain a target current value.

4. The method according to claim 1, characterized in that Generating the modified modulation wave of each of the excess capacity branches according to the voltage drop data of each of the excess capacity branches comprises: 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, characterized in that The voltage control of the grid-type static synchronous condenser is performed according to the modified modulation wave of each over-capacitance branch, including: Determining the target output voltage of the grid-type static synchronous condenser according to the modified modulation wave of each over-capacitance branch; According to the target output voltage, the voltage of the grid-type static synchronous phase condenser is controlled by using pulse width modulation technology.

6. The method according to claim 5, characterized in that The method of controlling the voltage of the grid-type static synchronous phase condenser by using a pulse width modulation technique according to the target output voltage comprises: According to the target output voltage, pulse width modulation is performed on the grid-type static synchronous phase condenser to output a control signal; The voltage of the grid-type static synchronous phase condenser is controlled according to the control signal.

7. An ultra-capacitive multi-branch balancing system for a network-type static synchronous condenser, characterized in that: include: A data acquisition module, used to acquire current data of each over-capacity branch in a grid-type static synchronous condenser; An integral control module, configured to output the voltage drop data of each overcapacity branch by using a proportional integral controller based on the current data of each overcapacity branch; A modulation wave correction module, used for generating a correction modulation wave of 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 over-capacitance branch.

8. The system according to claim 7, characterized in that The integral control module comprises: A regulating current calculation submodule, used for performing difference calculation between the current data of each excess capacity branch and the pre-calculated target current value, to obtain the 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 over-capacity branch respectively, and output the voltage drop data of each over-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, an ultra-capacitive multi-branch balancing method for a meshed static synchronous condenser as claimed in 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 network-type static synchronous phase condenser as described in any one of claims 1 to 6 is implemented.

Images