Grid-connected converter damping optimization method for correcting the dynamics of active / reactive current commands

Abstract

The present invention discloses a damping optimization method and system for grid-connected converters to correct the dynamics of active / reactive current commands, belonging to the field of power system stability control. The present invention adds a command correction signal to the dq-axis current command values of the grid-connected converter. By correcting the active current command and reactive current command of the converter that are in the same direction and orthogonal to the terminal voltage position and making them subject to proportional regulation of the terminal voltage frequency dynamics during the dynamic process, positive damping can be provided for the grid-connected system of the converter equipment without adding electrical measurement links and without reducing the power transmission efficiency of the converter. It can improve the weak damping dynamic regulation process or suppress the divergence phenomenon of underdamped oscillation, and improve the system stability. Different from various additional damping control methods, the present invention corrects the dynamics of the active / reactive current commands and makes them subject to proportional regulation of the terminal voltage frequency dynamics. The damping effect will not be affected by the oscillation frequency, expanding the effective damping frequency band, and realizing damping optimization in the full frequency band.

Description

Technical Field

[0001] The present invention belongs to the field of power system stability control, and more specifically, relates to a damping optimization method for grid-connected converters that corrects the dynamics of active / reactive current commands. Background Art

[0002] Voltage Source Converters (VSCs) are widely used in the power generation, transmission, and consumption links of power systems, deeply participating in the dynamic processes of power systems and causing underdamped oscillation phenomena.

[0003] At present, the damping optimization methods for converter equipment grid-connected systems mainly focus on the optimal design of converter control parameters, additional damping control, and adding energy-consuming resistors. Among them, both the optimal design of converter control parameters and the additional damping control method can effectively optimize the underdamped oscillation phenomenon in a specific frequency band. However, due to the sensitivity of the controller to the oscillation frequency, damping optimization cannot be achieved in the full frequency band. In order to expand the effective damping frequency band of additional damping control, a large number of improvement and compensation methods have been applied to various additional damping controls, but the inherent characteristic of the controller's sensitivity to the oscillation frequency still cannot be changed, resulting in that specific conventional converter control parameters or additional damping control parameters cannot meet the damping optimization objectives in a large frequency band. In addition, although the damping optimization method of adding an energy-consuming resistor can optimize the underdamped oscillation phenomenon in the full frequency band, it will bring unnecessary power losses and reduce the power transmission efficiency of the converter. Summary of the Invention

[0004] In view of the above defects or improvement requirements of the prior art, the present invention provides a damping optimization method and system for grid-connected converters that correct the dynamics of active / reactive current commands, aiming to achieve underdamped oscillation optimization in the full frequency band without additional power losses.

[0005] To achieve the above object, according to one aspect of the present invention, a damping optimization method for grid-connected converters that corrects the dynamics of active / reactive current commands is provided, including:

[0006] S1. After subtracting the phase-locked frequency ω p from the power frequency ω0, respectively passing through the d-axis current command correction additional control and the q-axis current command correction additional control, the d-axis current command correction value and the q-axis current command correction value

[0007] S2. Subtracting the d-axis current command correction value from the d-axis current command value in the phase-locked coordinate system to correct the high-order influence of the receiving-end voltage frequency on the active current command, so that the dynamics of the corrected active current command Subject to the damping effect that varies in the same direction as the grid terminal voltage frequency; the corrected active current command and the d-axis current of the filter inductor grid-side current in the phase-locked coordinate system are subtracted, and the obtained first difference is adjusted by the PI proportional-integral link of the d-axis current controller to form the d-axis internal potential command value in the phase-locked coordinate system

[0008] S3. The q-axis current command value in the phase-locked coordinate system is subtracted from the q-axis current command correction value to correct the high-order influence of the reactive current command on the terminal voltage frequency, so that the corrected reactive current command is dynamically subject to the damping effect that varies in the same direction as the grid terminal voltage frequency; the corrected reactive current command and the q-axis current of the filter inductor grid-side current in the phase-locked coordinate system are subtracted, and the obtained second difference is adjusted by the PI proportional-integral link of the q-axis current controller to form the q-axis internal potential command value in the phase-locked coordinate system

[0009] S4. The d-axis internal potential command value in the phase-locked coordinate system and the q-axis internal potential command value Based on θ p are transformed by dq / abc coordinate transformation to obtain the three-phase internal potential commands e aref , e bref and e cref ; the three-phase internal potential commands e aref , e bref and e cref After PWM modulation, the three-phase internal potential E of the voltage-source grid-connected converter is adjusted abc and the three-phase current i abc , thereby changing the terminal voltage point frequency ω t .

[0010] Furthermore, the dq-axis current command correction values are:

[0011]

[0012] is the d-axis current command correction value, is the q-axis current command correction value, ω p is the phase-locked frequency, the power frequency ω0, k pp and k ip are the proportional parameter and integral parameter of the phase-locked loop respectively, τ1 and τ2 represent the time constants of the d-axis and q-axis low-pass filters respectively, and α1 and α2 represent the d-axis and q-axis correction additional control damping coefficients respectively, represents the steady-state value of the q-axis current command value, Represents the steady-state value of the d-axis current command value.

[0013] Furthermore, within the range where small disturbances can be linearized, the active current command dynamics and the reactive current command dynamics are affected by the receiving-end voltage frequency dynamics Δω t The influencing relationship is:

[0014]

[0015] Furthermore, the corrected active current command dynamics and the reactive current command dynamics are expressed as

[0016]

[0017] Δi dc is the correction value of the active current command, and Δi qc is the correction value of the reactive current command. is the d-axis current command dynamics in the phase-locked coordinate system, is the q-axis current command dynamics in the phase-locked coordinate system.

[0018] The present invention also provides a grid-connected converter damping optimization system for correcting the active / reactive current command dynamics, including:

[0019] d-axis current command correction value acquisition module, which subtracts the phase-locked frequency ω p from the power frequency ω0, and after passing through the d-axis current command correction additional control, obtains the d-axis current command correction value

[0020] q-axis current command correction value acquisition module, which subtracts the phase-locked frequency ω p from the power frequency ω0, and after passing through the q-axis current command correction additional control, obtains the q-axis current command correction value

[0021] Active current command correction module, which subtracts the d-axis current command value in the phase-locked coordinate system from the d-axis current command correction value to correct the high-order influence of the active current command on the receiving-end voltage frequency, so that the corrected active current command dynamics is subject to a damping effect that varies in the same direction as the grid-side voltage frequency;

[0022] d-axis internal potential command feedback control module, which subtracts the corrected active current command from the d-axis current of the filter inductor grid-side current in the phase-locked coordinate system, and adjusts the obtained first difference through the PI proportional-integral link of the d-axis current controller to form the d-axis internal potential command value

[0023] Reactive current command correction module, which subtracts the q-axis current command correction value from the q-axis current command value in the locked-phase coordinate system to correct the high-order influence of the received terminal voltage frequency on the reactive current command, so that the corrected reactive current command is dynamically subject to the damping effect that changes in the same direction as the grid-side voltage frequency;

[0024] q-axis internal potential command feedback control module, which subtracts the corrected reactive current command from the q-axis current of the filter inductor grid-side current in the locked-phase coordinate system and adjusts the obtained second difference through the PI proportional-integral link of the q-axis current controller to form the q-axis internal potential command value in the locked-phase coordinate system

[0025] dq / abc coordinate transformation module, which performs dq / abc coordinate transformation on the d-axis internal potential command value and the q-axis internal potential command value in the locked-phase coordinate system based on θ to obtain the three-phase internal potential commands e p , e aref , and e bref ; cref

[0026] PWM modulation module, which performs PWM modulation on the three-phase internal potential commands e aref , e bref , and e cref to adjust the three-phase internal potential E abc and the three-phase current i abc of the voltage-source grid-connected converter, and then change the terminal voltage point frequency ω t .

[0027] Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention can achieve the following beneficial effects.

[0028] (1) The present invention adds an additional command correction signal to the dq-axis current command value of the grid-connected converter. By correcting the active current command and reactive current command of the converter that are in the same direction and orthogonal to the terminal voltage position and making them subject to the proportional regulation of the terminal voltage frequency dynamics during the dynamic process, positive damping can be provided for the converter equipment grid-connected system without adding an electrical measurement link and without reducing the power transmission efficiency of the converter, improving the weak damping dynamic regulation process or suppressing the divergence of the underdamped oscillation phenomenon, and enhancing the system stability.

[0029] (2) Different from various additional damping control methods, the present invention dynamically corrects the active / reactive current commands and makes the dynamic proportional regulation of the receiving-end voltage frequency. The damping effect will not be affected by the oscillation frequency, expanding the effective damping frequency band and enabling full-band damping optimization. Brief Description of the Drawings

[0030] Figure 1 Schematic diagram of the grid-connected system structure of the voltage-source grid-connected converter of the present invention;

[0031] Figure 2 Schematic diagram of the additional control for correcting the active / reactive current commands based on the phase-locked frequency of the present invention;

[0032] Figure 3 The grid-connected system structure of the voltage-source grid-connected converter connected to a weak grid. This is a recommended simulation example of the present invention, and the actual application is not limited to this structure and these parameters;

[0033] Figure 4 The d-axis current ip in the phase-locked coordinate system when the additional control for correcting the active / reactive current commands is set or not d Time-domain simulation waveforms after being disturbed; where a phase disturbance of 0.02 p.u. is superimposed on the grid terminal voltage at 10.0 s: Detailed Embodiment

[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] Reference Figure 1 , the grid-connected converter damping optimization method based on phase-locked frequency correction of active / reactive current commands provided by the present invention includes the following steps:

[0036] S1: Subtract the d-axis current command correction value formed by the d-axis current command value in the phase-locked coordinate system from the d-axis current in the phase-locked coordinate system, and adjust it through the PI proportional-integral link of the d-axis current controller to form the d-axis internal potential command value in the phase-locked coordinate system. Subtract the q-axis current command correction value formed by the q-axis current command value in the phase-locked coordinate system from the q-axis current in the phase-locked coordinate system, and adjust it through the PI proportional-integral link of the q-axis current controller to form the q-axis internal potential command value in the phase-locked coordinate system

[0037] Specifically, the d-axis current command value in the locked-phase coordinate system and the q-axis current command value The acquisition process is as follows: The DC-side capacitor voltage command value U of the voltage-source grid-connected converter dcref (with a per-unit value of 1) and the measured value U dc are subtracted and then regulated by the PI proportional-integral link of the DC voltage controller to form the d-axis current command value in the locked-phase coordinate system The reactive power command value Q output by the device ref and the actual reactive power Q output by the device are subtracted and then regulated by the PI proportional-integral link of the reactive power controller to form the q-axis current command value in the locked-phase coordinate system

[0038] d-axis current and the q-axis current The acquisition process is as follows: The three-phase terminal voltages U of the system where the voltage-source grid-connected converter is located are collected tabc and the three-phase grid-side currents i of the filter inductor abc ; The locked-phase frequency ω tracking the fundamental positive-sequence frequency of the terminal voltage in the synchronous rotating coordinate system and the locked-phase position θ tracking the fundamental positive-sequence phase of the terminal voltage in the synchronous rotating coordinate system are obtained through a phase-locked loop p ; U p is based on θ tabc After the abc / dq coordinate transformation, the d-axis terminal voltage in the locked-phase coordinate system is obtained p and the q-axis terminal voltage and the q-axis terminal voltage i abc is based on θ p After the abc / dq coordinate transformation, the d-axis current in the locked-phase coordinate system is obtained and the q-axis current

[0039] The locked-phase frequency ω tracking the fundamental positive-sequence frequency in the synchronous rotating coordinate system of the terminal voltage p and the locked-phase position θ tracking the fundamental positive-sequence phase of the terminal voltage in the synchronous rotating coordinate system p The relationship is as follows:

[0040]

[0041] where k pp and k ip are the proportional parameter and integral parameter of the phase-locked loop respectively, is the q-axis terminal voltage in the locked-phase coordinate system obtained by the abc / dq coordinate transformation of U tabc based on θ p ω0 is the power frequency (usually 100π rad / s).

[0042] Based on θ p The abc / dq coordinate transformation is represented by the transformation matrix C abc / dq The relationship is:

[0043]

[0044] S2: The internal potential command value in the d-axis of the phase-locked coordinate system and the internal potential command value in the q-axis Based on θ p After the dq / abc coordinate transformation, the three-phase internal potential commands e aref 、e bref and e cref are obtained; The three-phase internal potential commands e aref 、e bref and e cref After passing through the PWM modulation module, the three-phase internal potential E of the voltage-source grid-connected converter can be adjusted abc and the three-phase current i abc , thereby changing the terminal voltage point frequency ω t and improving the weak-damping dynamic regulation process or suppressing the divergence of the under-damped oscillation phenomenon accordingly.

[0045] Specifically, the dq / abc coordinate transformation based on θ p is represented by the transformation matrix C dq / abc The relationship is:

[0046]

[0047] Next, the principle of how the present invention improves the weak-damping dynamic regulation process or suppresses the divergence of the under-damped oscillation phenomenon will be analyzed in detail:

[0048] The detection error of the non-ideal Phase-Locked Loop (PLL) for the terminal voltage position causes the controller's feedback current to be the projection of the alternating current vector on the d-axis and q-axis of the phase-locked coordinate system, rather than the active current and reactive current that are in the same direction and orthogonal to the terminal voltage position. As a result, the actual active current command and reactive current command are not the dq-axis current commands, and they are affected by this detection error during the dynamic process and further affect the grid connection dynamic process of the converter equipment.

[0049] Due to the detection error of the PLL for the terminal voltage position, the phase-locked coordinate system does not coincide with the terminal voltage position orientation coordinate system, and the angle between the two coordinate systems is the difference between the terminal voltage position and the phase-locked position, that is, the phase-locked error The actual active current command i t dref and the reactive current command are respectively expressed as:

[0050]

[0051] Within the range of small disturbances where linearization is possible, the active / reactive current commands are dynamically expressed as

[0052]

[0053] It can be seen that the dynamics of the active current command and the dynamics of the reactive current command are affected by the receiving - end voltage frequency dynamics Δω t This influence relationship is a high - order relationship, which will have different effects on the grid - connection dynamic behavior of the converter equipment in different frequency bands. Therefore, the damping optimization of the converter equipment can be achieved by optimizing the relationship between the active / reactive current commands introduced by the detection error and the terminal voltage frequency.

[0054] When the time constant of the low - pass filter is small, considering the relationship between the phase - locked frequency and the terminal voltage frequency, the corrected dynamics of the active current command and the reactive current command can be approximately expressed as:

[0055]

[0056] It is expected in the present invention that the active current command and the reactive current command are respectively corrected by the correction value of the active current command Δi dc and the correction value of the reactive current command Δi qc to achieve damping optimization within the entire frequency band after correction. Therefore, the corrected objective is as shown in Equation (6). In the formula, α1 and α2 respectively represent the damping coefficients of the d - axis and q - axis correction links. The terms in the active / reactive current commands determined by them that are proportional to the terminal voltage frequency dynamics provide positive damping power for the converter equipment control within the entire frequency band, achieving the damping optimization objective.

[0057] Therefore, referring to Figure 2 , the additional control for command correction is designed as shown in Equation (8). The phase - locked frequency ω p obtained by the phase - locked loop is subtracted from the power - frequency ω0, and the correction value of the d - axis current command and the correction value of the q - axis current command are respectively obtained through this d - axis command correction additional control and q - axis command correction additional control. This correction link realizes the correction of the high - order influence of the terminal voltage frequency on the active / reactive current commands in Equation (5), eliminates the high - order influence and makes it provide a proportional positive damping influence.

[0058]

[0059] τ1 and τ2 respectively represent the time constants of the d - axis and q - axis low - pass filters, α1 and α2 respectively represent the damping coefficients of the d - axis and q - axis command correction additional controls, represents the steady - state value of the q - axis current command value, Represents the steady-state value of the d-axis current command value.

[0060] As shown in Equation (6), after correction, the dynamics of the active current command and the reactive current command are respectively affected by the dynamics of the d-axis current command in the locked-phase coordinate system output by the DC voltage controller And the dynamics of the q-axis current command in the locked-phase coordinate system output by the reactive power controller In addition, it is also affected by the damping effect that varies in the same direction as the grid terminal voltage frequency. When the terminal voltage frequency increases, the corrected active current command and reactive current command decrease accordingly to control and reduce the terminal voltage frequency; when the terminal voltage frequency decreases, the corrected active current command and reactive current command increase accordingly to control and increase the terminal voltage frequency.

[0061] Figure 3 Is the system structure of the voltage-source grid-connected converter connected to a weak grid. This is a recommended simulation example of the present invention, and the actual application is not limited to this structure and these parameters. In the figure, the voltage-source grid-connected converter adopts the control structure as Figure 1 Shown, in which, additional control links for correcting the active current command and the reactive current command based on the locked-phase frequency are respectively set and not set.

[0062] Figure 4 Is the time-domain simulation waveform of the d-axis current in the locked-phase coordinate system when a 0.02 p.u. phase disturbance is superimposed on the grid terminal voltage at 10.0 s in the system. It can be seen that after the system is disturbed, when the additional control links for correcting the active current command and the reactive current command based on the locked-phase frequency are not set, the system shows an oscillation instability phenomenon. However, after the additional control links for correcting the active current command and the reactive current command based on the locked-phase frequency are set, the system oscillation converges, and the steady-state current value is not affected, indicating that the correction link optimizes the damping of the converter grid-connected system without sacrificing the steady-state current output ability. It is easy for those skilled in the art to understand that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0063] It is easy for those skilled in the art to understand that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A damping optimization method for grid-connected converters to correct the dynamics of active / reactive current commands, characterized in that, including: S1. Subtract the phase-locked frequency ω p from the power frequency ω0, and then respectively pass through the additional control for d-axis current command correction and the additional control for q-axis current command correction to obtain the corrected value of the d-axis current command and the corrected value of the q-axis current command S2. Subtract the d-axis current command value from the d-axis current command correction value to correct the high-order influence of the receiving-end voltage frequency on the active current command, so that the corrected active current command is dynamically subject to the damping effect that varies in the same direction as the grid-side voltage frequency; subtract the corrected active current command from the d-axis current of the filter inductor grid-side current in the locked-phase coordinate system and adjust the obtained first difference through the PI proportional-integral link of the d-axis current controller to form the d-axis internal potential command value in the locked-phase coordinate system S3. Subtract the q-axis current command value from the q-axis current command correction value to correct the high-order influence of the receiving-end voltage frequency on the reactive current command, so that the corrected reactive current command is dynamically subject to the damping effect that varies in the same direction as the grid-side voltage frequency; subtract the corrected reactive current command from the q-axis current of the filter inductor on the grid side in the phase-locked coordinate system and adjust the obtained second difference through the PI proportional-integral link of the q-axis current controller to form the q-axis internal potential command value in the phase-locked coordinate system The potential command value in the d-axis of the locked-phase coordinate system and the potential command value in the q-axis Based on θ p After the dq / abc coordinate transformation, the three-phase internal potential command e aref 、e bref and e cref ; The three-phase internal potential commands e aref 、e bref and e cref After PWM modulation, the three-phase internal potential E of the voltage-source grid-connected converter is adjusted abc and the three-phase current i abc , thereby changing the terminal voltage point frequency ω t .

2. A damping optimization method for a grid-connected converter that corrects the dynamics of active / reactive current commands according to claim 1, characterized in that The correction value of the dq-axis current command is: is the correction value of the d-axis current command, is the correction value of the q-axis current command, ω p is the phase-locked frequency, the power frequency ω0, k pp and k ip are the proportional parameter and integral parameter of the phase-locked loop respectively. τ1 and τ2 represent the time constants of the d-axis and q-axis low-pass filters respectively, and α1 and α2 represent the additional control damping coefficients of the d-axis and q-axis corrections respectively. represents the steady-state value of the q-axis current command value, represents the steady-state value of the d-axis current command value.

3. A damping optimization method for a grid-connected converter that corrects the dynamics of active / reactive current commands according to claim 1, characterized in that Within the range where small disturbances can be linearized, the dynamics of the active current command and the dynamics of the reactive current command The relationship affected by the receiving-end voltage frequency dynamics Δω t is as follows:

4. A damping optimization method for a grid-connected converter that corrects the dynamics of active / reactive current commands according to claim 1, characterized in that, Corrected active current command dynamics And reactive current command dynamics Are expressed as: Δi dc is the correction value of the active current command, Δi qc is the correction value of the reactive current command, is the dynamic of the d-axis current command in the phase-locked coordinate system, is the dynamic of the q-axis current command in the phase-locked coordinate system.

5. A grid-connected converter damping optimization system for correcting the dynamics of active / reactive current commands, characterized in that, including: The d-axis current command correction value acquisition module subtracts the locked-phase frequency ω p from the power frequency ω0, and obtains the d-axis current command correction value through the additional control of the d-axis current command correction q-axis current command correction value acquisition module, which subtracts the phase-locked frequency ω p from the power frequency ω0, and performs additional control on the q-axis current command correction to obtain the q-axis current command correction value Active current command correction module, which subtracts the d-axis current command correction value from the d-axis current command value in the locked-phase coordinate system to correct the high-order influence of the active current command on the receiving-end voltage frequency, so that the corrected active current command is dynamically damped by the change in the same direction as the grid-end voltage frequency; from the d-axis current command correction value to correct the high-order influence of the active current command on the receiving-end voltage frequency, so that the corrected active current command is dynamically damped by the change in the same direction as the grid-end voltage frequency; The d-axis internal potential command feedback control module subtracts the corrected active current command from the d-axis current of the filter inductor grid-side current in the phase-locked coordinate system, and adjusts the obtained first difference through the PI proportional-integral link of the d-axis current controller to form the d-axis internal potential command value in the phase-locked coordinate system Take the difference, and adjust the obtained first difference through the PI proportional-integral link of the d-axis current controller to form the d-axis internal potential command value in the phase-locked coordinate system Reactive current command correction module, which subtracts the q-axis current command value in the phase-locked coordinate system from the q-axis current command correction value to correct the high-order influence of the receiving-end voltage frequency on the reactive current command, so that the corrected reactive current command is dynamically subject to a damping effect that varies in the same direction as the grid-end voltage frequency; The q-axis internal potential command feedback control module subtracts the corrected reactive current command from the q-axis current of the filter inductor grid-side current in the phase-locked coordinate system, and adjusts the obtained second difference through the PI proportional-integral link of the q-axis current controller to form the q-axis internal potential command value in the phase-locked coordinate system Make a difference, and adjust the obtained second difference through the PI proportional-integral link of the q-axis current controller to form the q-axis internal potential command value in the phase-locked coordinate system dq / abc coordinate transformation module, for the internal potential command value in the d-axis of the phase-locked coordinate system and the internal potential command value in the q-axis Based on θ p Perform dq / abc coordinate transformation to obtain the three-phase internal potential commands e aref 、e bref and e cref ; The PWM modulation module is used to perform PWM modulation on the three-phase internal potential commands e aref 、e bref and e cref After that, the three-phase internal potential E of the voltage-source grid-connected converter is adjusted abc and the three-phase current i abc , thereby changing the terminal voltage point frequency ω t .

6. The grid-connected converter damping optimization system for correcting the dynamics of active / reactive current commands according to claim 5, characterized in that, The correction value of the dq-axis current command is: is the correction value of the d-axis current command, is the correction value of the q-axis current command, ω p is the phase-locked frequency, the power frequency ω0, k pp and k ip are the proportional parameter and integral parameter of the phase-locked loop respectively. τ1 and τ2 represent the time constants of the d-axis and q-axis low-pass filters respectively. α1 and α2 represent the additional control damping coefficients for d-axis and q-axis corrections respectively, represents the steady-state value of the q-axis current command value, represents the steady-state value of the d-axis current command value.

7. A grid-connected converter damping optimization system for correcting the dynamics of active / reactive current commands according to claim 6, characterized in that, Within the range where small disturbances can be linearized, the dynamics of the active current command and the dynamics of the reactive current command are related to the dynamic Δω of the receiving-end voltage frequency t by the following relationship:

8. A grid-connected converter damping optimization system for correcting the dynamics of active / reactive current commands according to claim 6, characterized in that, Dynamic of the corrected active current command And the dynamic of the reactive current command Are expressed as: Active current command correction value dynamic Δi dc And reactive current command correction value dynamic Δi qc , Locked-phase coordinate system d-axis current command dynamic Locked-phase coordinate system q-axis current command dynamic

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