Dual-frequency variable voltage pulse discharge control system

Abstract

The invention discloses a dual-frequency variable voltage pulse discharge control system, and the system comprises a rated voltage signal input module which is used for selecting voltage value parameters in different operation time periods; the rated frequency selection module is used for selecting an operation frequency; the reactive power-voltage control module generates a three-phase voltage amplitude signal E ref through a proportional integral controller PI based on the received signal; the active-frequency control module is used for generating a three-phase voltage angle frequency omega ref and a phase angle signal theta ref based on the received signal; the virtual synchronous machine signal generation module is used for receiving output signals of the reactive power-voltage control module and the active power-frequency control module and generating a three-phase sine reference signal; the voltage and current double-closed-loop control module is used for obtaining a three-phase PCS positive chord reference signal based on the received three-phase sine reference signal; and the carrier phase-shifting modulation module is used for modulating the three-phase PCS-end forward chord reference signal to generate a PCS-end control signal.

Description

Technical Field

[0001] This application belongs to the field of energy storage and power supply technology, and in particular relates to a dual-frequency variable voltage pulse discharge control system. Background Technology

[0002] The HL-3 tokamak device power supply system is planned to use a 300MVA supercapacitor energy storage system to replace the original two 80MVA horizontal pulse generators to power the TF coil. The 300MVA supercapacitor energy storage system consists of 12 cascaded 25MVA energy storage subsystems.

[0003] Existing energy storage control technologies are mostly grid-connected and cannot operate independently. Grid-based controls based on droop control or virtual synchronous machine control typically operate for extended periods at rated voltage and frequency, making them unsuitable for applications requiring short-term pulse discharge, dual-frequency operation, and varying output voltage during operation. Energy storage subsystems must not only meet discharge requirements but also possess the capability for parallel operation of multiple systems. Summary of the Invention

[0004] The purpose of this application is to address the special operating conditions required for the operation of a supercapacitive energy storage subsystem. This application discloses a dual-frequency variable voltage pulse discharge control system.

[0005] The objective of this application is achieved through the following technical solution: A dual-frequency variable voltage pulse discharge control system, comprising: a rated voltage signal input module, a rated frequency selection module, a reactive power-voltage control module, an active power-frequency control module, a virtual synchro signal generation module, a voltage and current dual closed-loop control module, and a carrier phase-shift modulation module; The rated voltage signal input module is used to select voltage parameters for different operating time periods; the rated frequency selection module is used to select the operating frequency; and the reactive power-voltage control module generates three-phase voltage amplitude signals based on the received signal and through a proportional-integral controller (PI). E ref The active power-frequency control module generates three-phase voltage angular frequencies based on the received signals. ω ref With phase angle signal θ ref The virtual synchronous machine signal generation module receives the output signals from the reactive power-voltage control module and the active power-frequency control module to generate a three-phase sinusoidal reference signal. The voltage and current dual closed-loop control module obtains the three-phase PCS terminal sinusoidal reference signal based on the received three-phase sinusoidal reference signal. The carrier phase-shift modulation module modulates the three-phase PCS terminal sinusoidal reference signal to generate the PCS terminal control signal.

[0006] According to a preferred embodiment, the rated frequency selection module is used to select an operating frequency of 50Hz or 70Hz.

[0007] According to a preferred embodiment, the reactive power-voltage control module is used to receive the rated voltage signal output by the rated voltage signal input module and the feedback three-phase voltage amplitude signal. U ofb Rated reactive power signal Q std With feedback reactive power signal Q fb The three-phase voltage amplitude signal is generated by the proportional-integral controller (PI controller). E ref .

[0008] According to a preferred embodiment, the active power-frequency control module is used to receive the operating frequency signal and the rated active power signal selected by the rated frequency selection module. P std With feedback active power signal P fb Generate three-phase voltage angular frequency ω ref With phase angle signal θ ref .

[0009] According to a preferred embodiment, the voltage and current dual closed-loop control module is used to receive a three-phase sinusoidal reference signal and a PCS-side current signal. i sd PCS side current signal i sq 、 Output voltage signal u od Output voltage signal u oq 、 Output current signal i od Output current signal i oq This enables error-free adjustment in a rotating coordinate system and outputs a rotating coordinate system voltage signal at the PCS terminal. u sd * and u sq * .

[0010] According to a preferred embodiment, the PCS terminal rotating coordinate system voltage signal u sd * and u sq *The three-phase PCS terminal sinusoidal reference signal is obtained after Park inverse transformation.

[0011] According to a preferred embodiment, in the voltage and current dual closed-loop control module, the voltage outer loop uses a proportional-integral controller (PI) for data processing, and the current inner loop uses a proportional controller (P) for data processing.

[0012] The aforementioned main solution and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed in this application. Those skilled in the art, after understanding the solution of this application, will realize that there are many combinations based on the prior art and common general knowledge, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here.

[0013] The beneficial effects of this application are: The control system of this application can operate at 50Hz or 70Hz during the discharge time (0-10s) of the tokamak device, and the control system effectively follows the rated voltage signal to realize the voltage amplitude change during the discharge period. The output response speed is fast and there is no overshoot. The power quality meets the grid connection requirements. The virtual synchronous machine signal generation module and the voltage and current dual closed-loop control module can realize frequency and voltage regulation according to the output power and have the ability to operate multiple subsystems in parallel, which can provide good conditions for the control of the upper-level energy storage system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the control structure of this application; Figure 2 This is the overall topology diagram of the energy storage subsystem; Figure 3 It simulates the load curve; Figure 4 The output voltage curve (a), frequency curve (b), and power curve (c) of a simulated 25MVA supercapacitor subsystem at 50Hz are shown. Figure 5 The output voltage curve (a), frequency curve (b), and power curve (c) of a simulated 25MVA supercapacitor subsystem at 70Hz are shown. Among them, 1-rated voltage signal input module, 2-rated frequency selection module, 3-reactive power-voltage control module, 4-active power-frequency control module, 5-virtual synchronous machine signal generation module, 6-voltage and current dual closed-loop control module, and 7-carrier phase shift modulation module. Detailed Implementation

[0015] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0016] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0017] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0018] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0019] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0020] Furthermore, it should be noted that unless otherwise specified in this application, the specific structures, connections, positions, power sources, etc. involved are all things that a person skilled in the art can know without creative effort based on the prior art.

[0021] Example 1 refer to Figure 1 As shown in the figure, a dual-frequency variable voltage pulse discharge control system is characterized in that the dual-frequency variable voltage pulse discharge control system includes: a rated voltage signal input module 1, a rated frequency selection module 2, a reactive power-voltage control module 3, an active power-frequency control module 4, a virtual synchro signal generation module 5, a voltage and current dual closed-loop control module 6, and a carrier phase shift modulation module 7.

[0022] Preferably, the rated voltage signal input module 1 is used to select voltage value parameters for different operating time periods.

[0023] Preferably, the rated frequency selection module 2 is used to select the operating frequency. Specifically, the rated frequency selection module 2 is used to select an operating frequency of 50Hz or 70Hz.

[0024] Preferably, the reactive power-voltage control module 3 generates three-phase voltage amplitude signals based on the received signals and through a proportional-integral controller (PI). E ref .

[0025] Specifically, the reactive power-voltage control module 3 receives the rated voltage signal output from the rated voltage signal input module 1 and the feedback three-phase voltage amplitude signal. U ofb Rated reactive power signal Q std With feedback reactive power signal Q fb The three-phase voltage amplitude signal is generated by the proportional-integral controller (PI controller). E ref .

[0026] Through the reactive power-voltage control module 3 in the system, the rated voltage can be tracked without error during discharge operation, and the output voltage can be changed during discharge operation.

[0027] Preferably, the active power-frequency control module 4 generates the three-phase voltage angular frequency based on the received signal. ω ref With phase angle signal θ ref .

[0028] Specifically, the active power-frequency control module 4 receives the operating frequency signal and the rated active power signal selected by the rated frequency selection module 2. P std With feedback active power signal P fb Generate three-phase voltage angular frequency ω ref With phase angle signal θ ref .

[0029] The active-frequency control module 4 within the system controls the virtual moment of inertia Jv and the virtual damping. D The system is optimized to achieve operation at either 50Hz or 70Hz, and can adjust the frequency according to changes in active power, with the ability to operate multiple subsystems in parallel.

[0030] Preferably, the virtual synchro signal generation module 5 is used to receive the output signals of the reactive-voltage control module 3 and the active-frequency control module 4 to generate a three-phase sinusoidal reference signal.

[0031] Preferably, the voltage and current dual closed-loop control module 6 obtains the three-phase PCS terminal sinusoidal reference signal based on receiving the three-phase sinusoidal reference signal.

[0032] Specifically, the voltage and current dual closed-loop control module 6 is used to receive the three-phase sinusoidal reference signal and the PCS-side current signal. i sd PCS side current signal i sq 、 Output voltage signal u od Output voltage signal u oq 、 Output current signal i od Output current signal i oq This enables error-free adjustment in a rotating coordinate system and outputs a rotating coordinate system voltage signal at the PCS terminal. u sd * and u sq * PCS-side rotating coordinate system voltage signal u sd * and u sq * The three-phase PCS terminal sinusoidal reference signal is obtained after Park inverse transformation.

[0033] Furthermore, in the voltage and current dual closed-loop control module 6, the voltage outer loop uses a proportional-integral controller (PI) for data processing, and the current inner loop uses a proportional controller (P) for data processing.

[0034] The system achieves error-free regulation of the voltage signal through the dual closed-loop voltage and current control module 6, decouples the coupling caused by the filter capacitor and filter inductor, and realizes independent control of the d-axis and q-axis; the introduction of the inner current loop improves the response speed to load switching; and the increase of the closed-loop bandwidth of the outer current loop makes the control module suitable for dual frequencies and remains stable when the filter is an inductor or capacitor alone.

[0035] Preferably, the carrier phase-shifting modulation module 7 is used to modulate the sinusoidal reference signal at the three-phase PCS terminal to generate the PCS terminal control signal.

[0036] Based on the system described in this application, a simulation model of a 25MVA supercapacitor subsystem was built. Figure 3 The load shown was subjected to discharge simulations at frequencies of 50Hz and 70Hz. The voltage amplitude, frequency variation, and output power curves are as follows: Figure 4 , Figure 5 As shown.

[0037] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-frequency variable voltage pulse discharge control system, characterized in that, The dual-frequency variable voltage pulse discharge control system includes: a rated voltage signal input module (1), a rated frequency selection module (2), a reactive power-voltage control module (3), an active power-frequency control module (4), a virtual synchro signal generation module (5), a voltage and current dual closed-loop control module (6), and a carrier phase shift modulation module (7). The rated voltage signal input module (1) is used to select voltage value parameters in different operating time periods; the rated frequency selection module (2) is used to select the operating frequency; and the reactive power-voltage control module (3) generates three-phase voltage amplitude signals based on the received signal and through a proportional-integral controller (PI). E ref The active power-frequency control module (4) generates the three-phase voltage angular frequency based on the received signal. ω ref With phase angle signal θ ref The virtual synchronous machine signal generation module (5) is used to receive the output signals of the reactive-voltage control module (3) and the active-frequency control module (4) to generate a three-phase sinusoidal reference signal; the voltage and current dual closed-loop control module (6) obtains the three-phase PCS terminal sinusoidal reference signal based on the received three-phase sinusoidal reference signal; the carrier phase shift modulation module (7) is used to modulate the three-phase PCS terminal sinusoidal reference signal to generate the PCS terminal control signal.

2. The dual-frequency variable voltage pulse discharge control system as described in claim 1, characterized in that, The rated frequency selection module (2) is used to select the operating frequency of 50Hz or 70Hz.

3. The dual-frequency variable voltage pulse discharge control system as described in claim 1 or 2, characterized in that, The reactive power-voltage control module (3) is used to receive the rated voltage signal output by the rated voltage signal input module (1) and the feedback three-phase voltage amplitude signal. U ofb Rated reactive power signal Q std With feedback reactive power signal Q fb The three-phase voltage amplitude signal is generated by the proportional-integral controller (PI controller). E ref .

4. The dual-frequency variable voltage pulse discharge control system as described in claim 3, characterized in that, The active power-frequency control module (4) is used to receive the operating frequency signal and the rated active power signal selected by the rated frequency selection module (2). P std With feedback active power signal P fb Generate three-phase voltage angular frequency ω ref With phase angle signal θ ref .

5. The dual-frequency variable voltage pulse discharge control system as described in claim 4, characterized in that, The voltage and current dual closed-loop control module (6) is used to receive the three-phase sinusoidal reference signal and the PCS side current signal. i sd PCS side current signal i sq 、 Output voltage signal u od Output voltage signal u oq 、 Output current signal i od Output current signal i oq This enables error-free adjustment in a rotating coordinate system and outputs a rotating coordinate system voltage signal at the PCS terminal. u sd * and u sq * .

6. The dual-frequency variable voltage pulse discharge control system as described in claim 5, characterized in that, PCS terminal rotating coordinate system voltage signal u sd * and u sq * The three-phase PCS terminal sinusoidal reference signal is obtained after Park inverse transformation.

7. The dual-frequency variable voltage pulse discharge control system as described in claim 5, characterized in that, In the voltage and current dual closed-loop control module (6), the voltage outer loop uses a proportional-integral controller (PI) for data processing, and the current inner loop uses a proportional controller (P) for data processing.

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