A method and system for controlling a broadband impedance measurement device

Abstract

The application discloses a control method and system of a wideband impedance measuring device, which injects disturbance current into a grid-connected system in parallel and obtains system impedance characteristics in response to voltage. The application collects grid point voltage and output current of the wideband impedance measuring device, obtains a fundamental component of a current reference value in a rotating coordinate system by adopting voltage outer loop control, obtains a disturbance component of the current reference value in the rotating coordinate system by adopting current outer loop control, and obtains three-phase control voltage of the wideband impedance measuring device by adopting current inner loop control, voltage feedforward control and carrier modulation, so that the wideband impedance measuring device control is effectively realized.

Description

Technical Field

[0001] This invention relates to a control method and system for a broadband impedance measurement device, belonging to the field of impedance measurement in new energy power generation. Background Technology

[0002] In recent years, my country's installed capacity of wind power and photovoltaic power has increased significantly, and the penetration rate of new energy into the power grid is getting higher and higher. Due to their highly nonlinear characteristics, power electronic equipment in new energy systems makes the behavior of traditional power systems more complex, seriously affecting the stability of the entire power grid.

[0003] Globally, numerous oscillation incidents have occurred due to the influence of power electronic equipment. High-frequency oscillations have arisen from the connection of renewable energy power plants to the grid via long-distance transmission lines. Interactions between flexible DC transmission systems and AC grids, as well as offshore wind farms, have triggered subsynchronous or mid-to-high-frequency oscillations. These oscillations exhibit new characteristics such as wide bandwidth and time-varying nature, severely impacting the effective absorption of renewable energy. Damping analysis methods can obtain system impedance characteristics, thereby predicting system oscillation risks and suppressing them. However, within large-scale renewable energy grid-connected systems, the impedance characteristics of renewable energy power generation equipment vary significantly, and factors such as high voltage and large capacity make the measurement of impedance characteristics of renewable energy power generation equipment even more complex.

[0004] Currently, cascaded full-bridge DC / AC converters can typically be used as wideband impedance measurement devices for wideband impedance measurement, but there is no corresponding control method yet. Summary of the Invention

[0005] This invention provides a control method and system for a wideband impedance measurement device, which solves the problems disclosed in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A control method for a broadband impedance measurement device includes:

[0008] Collect u a u b u c and i a i b i c Convert to u respectively d u q and i d i q ; where u a u b u c For the three-phase voltage at the grid connection point of the broadband impedance measurement device, i a i b ic The three-phase current output by the broadband impedance measurement device, u d u q u in the rotating coordinate system a u b u c The d-axis components and q-axis components, i d i q i in the rotating coordinate system a i b i c The first d-axis component and the first q-axis component;

[0009] For u dc and U dc_ref Perform voltage outer loop control to obtain I d0_ref ; where u dc U is the DC-side capacitor voltage of the wideband impedance measurement device. dc_ref I is the reference value for the DC-side capacitor voltage. d0_ref The current reference value is the d-axis fundamental wave component in the rotating coordinate system;

[0010] to i a i b i c and i a_ref i b_ref i c_ref Perform current outer loop control to obtain i d1_ref i q1_ref ; where i a_ref i b_ref i c_ref i is the preset reference value for three-phase disturbance current. d1_ref i q1_ref These represent the d-axis and q-axis disturbance components of the current reference value in the rotating coordinate system, respectively.

[0011] to i d i q u d u q I d0_ref I q0_ref i d1_ref i q1_ref Perform current inner loop control and voltage feedforward control to obtain u d_conv u q_conv Among them, I q0_ref The current reference value q-axis fundamental component in the preset rotating coordinate system, u d_conv u q_conv These are the d-axis and q-axis components of the three-phase control voltage in the rotating coordinate system, respectively.

[0012] For u d_conv uq_conv Perform carrier modulation to obtain u a_conv u b_conv u c_conv ; where u a_conv u b_conv u c_conv The three-phase control voltage for a broadband impedance measurement device;

[0013] According to u a_conv u b_conv u c_conv Control the switching transistors of a broadband impedance measurement device.

[0014] Collect u a u b u c and i a i b i c Convert to u respectively d u q and i d i q ,include:

[0015] For the collected u a u b u c Perform phase-locked loop processing to obtain the phase;

[0016] For phase and u a u b u c Perform the abc / dq0 transformation to obtain u d u q ;

[0017] For the collected i a i b i c Perform the abc / dq0 transformation to obtain i d i q .

[0018] For u dc and U dc_ref Perform voltage outer loop control to obtain I d0_ref ,include:

[0019] For u dc Perform filtering to obtain U dc Among them, U dc This refers to the DC voltage of the DC-side capacitor.

[0020] Calculate U dc with U dc_ref The difference;

[0021] Apply PI control to the difference to obtain I. d0_ref .

[0022] to i a i b i c and i a_ref i b_ref i c_ref Perform current outer loop control to obtain i d1_ref i q1_ref ,include:

[0023] to i a_ref i b_ref i c_ref Perform the abc / dq0 transformation to obtain I. d1_ref I q1_ref Among them, I d1_ref I q1_ref These are the d-axis and q-axis components of the disturbance current reference value in the rotating coordinate system, respectively.

[0024] to i a i b i c Perform the abc / dq0 transformation to obtain I. d1 I q1 , among which, I d1 I q1 i in the rotating coordinate system a i b i c The second d-axis component and the second q-axis component;

[0025] to I d1 with I d1_ref The difference is then subjected to PI control and dq0 / αβ0 transformation sequentially to obtain i d1_ref ;

[0026] to I q1 with I q1_ref The difference is then subjected to PI control and dq0 / αβ0 transformation sequentially to obtain i q1_ref .

[0027] to i d i q u d u q I d0_ref I q0_ref i d1_ref i q1_ref Perform current inner loop control and voltage feedforward control to obtain u d_conv u q_conv ,include:

[0028] Will I d0_refi d1_ref Add them together to get i d_ref ; where i d_ref The d-axis component is the current reference value;

[0029] Will I q0_ref i q1_ref Add them together to get i q_ref ; where i q_ref The current reference value is the q-axis component;

[0030] to i d_ref with i d The difference is used for PI control to obtain Δu d ; where Δu d The inner loop control voltage d-axis component;

[0031] to i q_ref with i q The difference is used for PI control to obtain Δu q ; where Δu q This refers to the q-axis component of the inner loop control voltage.

[0032] will i d_ref The product of the filter resistor, I q0_ref The product of the fundamental inductance, i q1_ref Add the product of the inductance and the disturbance to obtain u. d,L ; where u d,L This represents the d-axis component of the inductor voltage feedforward.

[0033] will i q_ref The product of the filter resistor, I d0_ref The product of the fundamental inductance, i d1_ref Add the product of the inductance and the disturbance to obtain u. q,L ; where u q,L This represents the q-axis component of the inductor voltage feedforward.

[0034] will u d u d,L and Δu d Add them together to get u d_conv ;

[0035] will u q u q,L and Δu q Add them together to get u q_conv .

[0036] For u d_conv u q_conv Perform carrier modulation to obtain u a_conv u b_conv u c_conv ,include:

[0037] For u d_conv u q_conv By sequentially performing amplitude limiting, multiplication of modulation ratio coefficients, and dq0 / abc transformation, u is obtained. a_m u b_m u c_m ;where u a_m u b_m u c_m To modulate the three-phase voltage;

[0038] will u a_m u b_m u c_m The intra-phase equalization three-phase voltage and the inter-phase equalization three-phase voltage are added together and PWM control is performed to obtain u. a_conv u b_conv u c_conv .

[0039] According to u a_conv u b_conv u c_conv Controlling the switching transistors of a broadband impedance measurement device includes:

[0040] According to u a_conv u b_conv u c_conv To obtain the duty cycle signal of the switching transistor in the broadband impedance measurement device;

[0041] The switching transistor in the broadband impedance measurement device is controlled to turn on and off based on the duty cycle signal.

[0042] A control system for a broadband impedance measurement device includes:

[0043] The input filtering module will input the collected u a u b u c and i a i b i c Convert to u respectively d u q and i d i q ; where u a u b u c For the three-phase voltage at the grid connection point of the broadband impedance measurement device, i a i b i c The three-phase current output by the broadband impedance measurement device, u d u q u in the rotating coordinate system a u b u cThe d-axis components and q-axis components, i d i q i in the rotating coordinate system a i b i c The first d-axis component and the first q-axis component;

[0044] Voltage outer loop module, for u dc and U dc_ref Perform voltage outer loop control to obtain I d0_ref ; where u dc U is the DC-side capacitor voltage of the wideband impedance measurement device. dc_ref I is the reference value for the DC-side capacitor voltage. d0_ref The current reference value is the d-axis fundamental wave component in the rotating coordinate system;

[0045] Current outer loop module, for i a i b i c and i a_ref i b_ref i c_ref Perform current outer loop control to obtain i d1_ref i q1_ref ; where i a_ref i b_ref i c_ref i is the preset reference value for three-phase disturbance current. d1_ref i q1_ref These represent the d-axis and q-axis disturbance components of the current reference value in the rotating coordinate system, respectively.

[0046] The current inner loop and voltage feedforward module, for i d i q u d u q I d0_ref I q0_ref i d1_ref i q1_ref Perform current inner loop control and voltage feedforward control to obtain u d_conv u q_conv Among them, I q0_ref The current reference value q-axis fundamental component in the preset rotating coordinate system, u d_conv u q_conv These are the d-axis and q-axis components of the three-phase control voltage in the rotating coordinate system, respectively.

[0047] The carrier modulation module, for u d_conv u q_conv Perform carrier modulation to obtain u a_conv u b_conv u c_conv ; where ua_conv u b_conv u c_conv The three-phase control voltage for a broadband impedance measurement device;

[0048] The switch control module, according to u a_conv u b_conv u c_conv Control the switching transistors of a broadband impedance measurement device.

[0049] A computer-readable storage medium storing one or more programs, the one or more programs including instructions that, when executed by a computing device, cause the computing device to perform a control method for a broadband impedance measurement device.

[0050] A computing device includes one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for performing a control method for a broadband impedance measurement device.

[0051] The beneficial effects achieved by this invention are as follows: This invention acquires the grid connection point voltage and output current of a broadband impedance measuring device, obtains the fundamental component of the current reference value in the rotating coordinate system by using voltage outer loop control, obtains the disturbance component of the current reference value in the rotating coordinate system by using current outer loop control, and obtains the three-phase control voltage of the broadband impedance measuring device by using current inner loop control, voltage feedforward control and carrier modulation, thus effectively realizing the control of the broadband impedance measuring device. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the control method for a broadband impedance measurement device.

[0053] Figure 2 This is a block diagram of the control system for a broadband impedance measurement device. Detailed Implementation

[0054] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0055] like Figure 1 As shown, a control method for a broadband impedance measurement device includes the following steps:

[0056] Step 1, collect u a u b u c and i a i b i c Convert to u respectivelyd u q and i d i q ; where u a u b u c For the three-phase voltage at the grid connection point of the broadband impedance measurement device, i a i b i c The three-phase current output by the broadband impedance measurement device, u d u q u in the rotating coordinate system a u b u c The d-axis components and q-axis components, i d i q i in the rotating coordinate system a i b i c The first d-axis component and the first q-axis component;

[0057] Step 2, for u dc and U dc_ref Perform voltage outer loop control to obtain I d0_ref ; where u dc U is the DC-side capacitor voltage of the wideband impedance measurement device. dc_ref I is the reference value for the DC-side capacitor voltage. d0_ref The current reference value is the d-axis fundamental wave component in the rotating coordinate system;

[0058] to i a i b i c and i a_ref i b_ref i c_ref Perform current outer loop control to obtain i d1_ref i q1_ref ; where i a_ref i b_ref i c_ref i is the preset reference value for three-phase disturbance current. d1_ref i q1_ref These represent the d-axis and q-axis disturbance components of the current reference value in the rotating coordinate system, respectively.

[0059] Step 3, for i d i q u d u q I d0_ref I q0_ref i d1_ref i q1_ref Perform current inner loop control and voltage feedforward control to obtain ud_conv u q_conv Among them, I q0_ref The current reference value q-axis fundamental component in the preset rotating coordinate system, u d_conv u q_conv These are the d-axis and q-axis components of the three-phase control voltage in the rotating coordinate system, respectively.

[0060] Step 4, for u d_conv u q_conv Perform carrier modulation to obtain u a_conv u b_conv u c_conv ; where u a_conv u b_conv u c_conv The three-phase control voltage for a broadband impedance measurement device;

[0061] Step 5, according to u a_conv u b_conv u c_conv Control the switching transistors of a broadband impedance measurement device.

[0062] The above method acquires the grid-connected voltage and output current of the broadband impedance measuring device, obtains the fundamental component of the current reference value in the rotating coordinate system by using voltage outer loop control, obtains the disturbance component of the current reference value in the rotating coordinate system by using parallel injection of disturbance current outer loop control, and obtains the three-phase control voltage of the broadband impedance measuring device by using current inner loop control, voltage feedforward control and carrier modulation, thus effectively realizing the control of the broadband impedance measuring device.

[0063] In the above method, u is first collected. a u b u c i a i b i c and u ij Where, subscript a represents phase A, b represents phase B, c represents phase C, and u ij Given the DC-side capacitor voltage of the j-th stage sub-power module in phase i of the broadband impedance measurement device, the DC-side capacitor voltage u of the broadband impedance measurement device can be further calculated using the following formula. dc ;

[0064]

[0065] Where n is the number of sub-power modules cascaded, i = a, b or c, j ∈ [1, n].

[0066] i a_ref i b_ref i c_ref U is the preset reference value for three-phase disturbance current.dc_ref These are reference values ​​for the DC-side capacitor voltage. These reference values ​​are externally input and are equivalent to target values.

[0067] For u a u b u c Perform phase-locked loop processing to obtain the phase, and compare the phase with u. a u b u c Perform the abc / dq0 transformation to obtain u d u q For the collected i a i b i c Perform the abc / dq0 transformation to obtain i d i q .

[0068] For u dc The DC voltage U of the DC-side capacitor is obtained by performing filtering (i.e., the Filter in the diagram). dc Calculate U dc with U dc_ref The difference ΔU dc For the difference ΔU dc Perform PI control to obtain I d0_ref The current reference value q-axis fundamental component I in the preset rotating coordinate system q0_ref .

[0069] to i a_ref i b_ref i c_ref Perform the abc / dq0 transformation to obtain the d-axis and q-axis components I of the disturbance current reference value in the rotating coordinate system. d1_ref I q1_ref , for i a i b i c Perform the abc / dq0 transformation (the abc / dq0 transformation here is the same as the transformation above for i). a i b i c There is a difference between performing the abc / dq0 transformation (the two methods use different transformation techniques and yield different transformation results), to obtain I. d1 I q1 I d1 I q1 i in the rotating coordinate system a i b i c The second d-axis component and the second q-axis component, for I d1 with I d1_ref The difference ΔI d1PI control and dq0 / αβ0 transformation are performed sequentially to obtain i d1_ref , to I q1 with I q1_ref The difference ΔI q1 PI control and dq0 / αβ0 transformation are performed sequentially to obtain i q1_ref .

[0070] Will I d0_ref i d1_ref Add them together to obtain the d-axis component i of the current reference value. d_ref , will I q0_ref i q1_ref Add them together to obtain the q-axis component of the current reference value i. q_ref ; for i d_ref with i d The difference Δi d Perform PI control to obtain the d-axis component Δu of the inner loop control voltage. d , for i q_ref with i q The difference Δi q Perform PI control to obtain the q-axis component Δu of the inner loop control voltage. q .

[0071] will i d_ref The product of I and the filter resistor (i.e., R in the diagram) q0_ref The product of the fundamental inductance (i.e., w0L in the figure) and i q1_ref Add the product of the product with the disturbance inductance (i.e., w1L in the figure) (addition means summing these three terms, but the sign of each term is different, i.e., "-" in the figure indicates a negative value) to obtain the inductor voltage feedforward d-axis component u. d,L ;change i q_ref The product of the filter resistor, I d0_ref The product of the fundamental inductance, i d1_ref Adding the product of the inductance and the disturbance inductance, we obtain the inductor voltage feedforward q-axis component u. q,L ; will u d u d,L and Δu d Add them together to get u d_conv ; will u q u q,L and Δu q Add them together to get u q_conv .

[0072] For u d_conv u q_conv By sequentially performing amplitude limiting, multiplication of modulation ratio coefficients, and dq0 / abc transformation, u is obtained. a_m u b_m u c_m ; will u a_m ub_m u c_m The intra-phase equalization three-phase voltage and the inter-phase equalization three-phase voltage are added together and PWM control is performed to obtain u. a_conv u b_conv u c_conv .

[0073] According to u a_conv u b_conv u c_conv The duty cycle signal of the switching transistor in the broadband impedance measuring device is obtained, and the switching on and off of the switching transistor in the broadband impedance measuring device is controlled according to the duty cycle signal.

[0074] In the above method, the current outer loop controls the disturbance frequency, reduces the coupling frequency, and improves the waveform quality of the disturbance frequency. The voltage outer loop controls the fundamental frequency, reducing the generation of grid harmonic-related frequencies. In general, the two outer loops work together to improve the waveform quality of the disturbance current, obtain the response voltage, calculate the impedance, and thus achieve accurate impedance measurement. Therefore, using the wideband impedance measurement device controlled by this invention can effectively reduce the generation of coupling frequency and grid harmonic-related frequencies, improve the waveform quality of disturbances over a wide frequency range, and achieve accurate measurement of high-voltage, high-capacity, wideband impedance characteristics.

[0075] Based on the same technical solution, this invention also discloses a software system for the above-mentioned method, such as... Figure 2 As shown, a control system for a broadband impedance measurement device includes:

[0076] The input filtering module will input the collected u a u b u c and i a i b i c Convert to u respectively d u q and i d i q ; where u a u b u c For the three-phase voltage at the grid connection point of the broadband impedance measurement device, i a i b i c The three-phase current output by the broadband impedance measurement device, u d u q u in the rotating coordinate system a u b u c The d-axis components and q-axis components, i d i q i in the rotating coordinate system ai b i c The d-axis and q-axis components.

[0077] Voltage outer loop module, for u dc and U dc_ref Perform voltage outer loop control to obtain I d0_ref ; where u dc U is the DC-side capacitor voltage of the wideband impedance measurement device. dc_ref I is the reference value for the DC-side capacitor voltage. d0_ref The reference value for the current in the rotating coordinate system is the d-axis fundamental wave component.

[0078] Current outer loop module, for i a i b i c and i a_ref i b_ref i c_ref Perform current outer loop control to obtain i d1_ref i q1_ref ; where i a_ref i b_ref i c_ref i is the preset reference value for three-phase disturbance current. d1_ref i q1_ref These represent the d-axis and q-axis disturbance components of the current reference value in the rotating coordinate system.

[0079] The current inner loop and voltage feedforward module, for i d i q u d u q I d0_ref I q0_ref i d1_ref i q1_ref Perform current inner loop control and voltage feedforward control to obtain u d_conv u q_conv Among them, I q0_ref The current reference value q-axis fundamental component in the preset rotating coordinate system, u d_conv u q_conv These are the d-axis and q-axis components of the three-phase control voltage in the rotating coordinate system, respectively.

[0080] The carrier modulation module, for u d_conv u q_conv Perform carrier modulation to obtain u a_conv u b_conv u c_conv ; where u a_conv u b_conv u c_conv This refers to the three-phase control voltage of a broadband impedance measurement device.

[0081] The switch control module, according to u a_conv u b_conv u c_conv Control the switching transistors of a broadband impedance measurement device.

[0082] The data processing flow and methods of each module in the above system are consistent with the corresponding steps, and will not be described again here.

[0083] Based on the same technical solution, the present invention also discloses a computer-readable storage medium storing one or more programs, the one or more programs including instructions that, when executed by a computing device, cause the computing device to perform a control method for a broadband impedance measurement device.

[0084] Based on the same technical solution, the present invention also discloses a computing device, including one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for executing a control method for a broadband impedance measurement device.

[0085] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0086] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0087] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0088] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0089] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A control method for a broadband impedance measurement device, characterized in that, include: Collected and Convert to and ;in, The three-phase voltage at the grid connection point of the broadband impedance measurement device. The three-phase current output by the broadband impedance measurement device. In the rotating coordinate system The d-axis and q-axis components, In the rotating coordinate system The first d-axis component and the first q-axis component; right and Perform voltage outer loop control to obtain ;in, This refers to the DC-side capacitor voltage of the broadband impedance measurement device. This is the reference value for the DC-side capacitor voltage. The current reference value is the d-axis fundamental wave component in the rotating coordinate system; right and Perform current outer loop control to obtain ;in, The preset three-phase disturbance current reference value, These represent the d-axis and q-axis disturbance components of the current reference value in the rotating coordinate system, respectively. Will Add them together to get ,Will Add them together to get ,right and The difference is used for PI control to obtain ,right and The difference is used for PI control to obtain ,Will The product of the filter resistor, The product of the fundamental inductance, Add the product of the disturbance inductance to obtain ,Will The product of the filter resistor, The product of the fundamental inductance, Add the product of the disturbance inductance to obtain ,Will , and Add them together to get ,Will , and Add them together to get ;in, The d-axis component of the current reference value. The current reference value is the q-axis component. The inner loop control voltage d-axis component. This refers to the q-axis component of the inner loop control voltage. The inductor voltage feedforward d-axis component, This represents the q-axis component of the inductor voltage feedforward. The current reference value q-axis fundamental component is set in a preset rotating coordinate system. These are the d-axis and q-axis components of the three-phase control voltage in the rotating coordinate system, respectively. right Perform carrier modulation to obtain ;in, The three-phase control voltage for a broadband impedance measurement device; according to Control the switching transistors of a broadband impedance measurement device.

2. The control method for a broadband impedance measurement device according to claim 1, characterized in that, Collected and Convert to and ,include: For the collected Perform phase-locked loop processing to obtain the phase; phase and Perform the abc / dq0 transformation to obtain ; For the collected Perform the abc / dq0 transformation to obtain .

3. The control method for a broadband impedance measurement device according to claim 1, characterized in that, right and Perform voltage outer loop control to obtain ,include: right Perform filtering to obtain ;in, This refers to the DC voltage of the DC-side capacitor. calculate and The difference; Apply PI control to the difference to obtain .

4. The control method for a broadband impedance measurement device according to claim 1, characterized in that, right and Perform current outer loop control to obtain ,include: right Perform the abc / dq0 transformation to obtain ;in, These are the d-axis and q-axis components of the disturbance current reference value in the rotating coordinate system, respectively. right Perform the abc / dq0 transformation to obtain ,in, In the rotating coordinate system The second d-axis component and the second q-axis component; right and The difference is then subjected to PI control and dq0 / αβ0 transformation sequentially to obtain... ; right and The difference is then subjected to PI control and dq0 / αβ0 transformation sequentially to obtain... .

5. The control method for a broadband impedance measurement device according to claim 1, characterized in that, right Perform carrier modulation to obtain ,include: right By sequentially performing amplitude limiting, multiplying the modulation ratio coefficients, and performing dq0 / abc transformation, we obtain... ;in To modulate the three-phase voltage; Will The intra-phase equalization three-phase voltage and the inter-phase equalization three-phase voltage are added together and then subjected to PWM control to obtain... .

6. The control method for a broadband impedance measurement device according to claim 1, characterized in that, according to Controlling the switching transistors of a broadband impedance measurement device includes: according to To obtain the duty cycle signal of the switching transistor in the broadband impedance measurement device; The switching transistor in the broadband impedance measurement device is controlled to turn on and off based on the duty cycle signal.

7. A control system for a broadband impedance measurement device, characterized in that, include: The input filtering module will collect the data. and Convert to and ;in, The three-phase voltage at the grid connection point of the broadband impedance measurement device. The three-phase current output by the broadband impedance measurement device. In the rotating coordinate system The d-axis and q-axis components, In the rotating coordinate system The first d-axis component and the first q-axis component; Voltage outer loop module, for and Perform voltage outer loop control to obtain ;in, This refers to the DC-side capacitor voltage of the broadband impedance measurement device. This is the reference value for the DC-side capacitor voltage. The current reference value is the d-axis fundamental wave component in the rotating coordinate system; Current outer loop module, for and Perform current outer loop control to obtain ;in, The preset three-phase disturbance current reference value, These represent the d-axis and q-axis disturbance components of the current reference value in the rotating coordinate system, respectively. The current inner loop and voltage feedforward module will Add them together to get ,Will Add them together to get ,right and The difference is used for PI control to obtain ,right and The difference is used for PI control to obtain ,Will The product of the filter resistor, The product of the fundamental inductance, Add the product of the disturbance inductance to obtain ,Will The product of the filter resistor, The product of the fundamental inductance, Add the product of the disturbance inductance to obtain ,Will , and Add them together to get ,Will , and Add them together to get ;in, The d-axis component of the current reference value. The current reference value is the q-axis component. The inner loop control voltage d-axis component. This refers to the q-axis component of the inner loop control voltage. The inductor voltage feedforward d-axis component, This represents the q-axis component of the inductor voltage feedforward. The current reference value q-axis fundamental component is set in a preset rotating coordinate system. These are the d-axis and q-axis components of the three-phase control voltage in the rotating coordinate system, respectively. Carrier modulation module, for Perform carrier modulation to obtain ;in, The three-phase control voltage for a broadband impedance measurement device; The switch control module, according to Control the switching transistors of a broadband impedance measurement device.

8. A computer-readable storage medium for storing one or more programs, characterized in that, The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods according to claims 1 to 6.

9. A computing device, characterized in that, include: One or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods according to claims 1 to 6.

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