Null drift rectification control method based on IGBT hydrogen production power supply

Abstract

The invention discloses a zero drift rectification control method based on an IGBT hydrogen production power supply, and the method comprises the steps: carrying out the voltage positive and negative sequence separation and current positive and negative sequence separation through three-phase power grid voltage and three-phase power grid current, and obtaining the dq-axis component of the positive and negative sequence voltage and the dq-axis component of the positive and negative sequence current; adding the dq-axis component of the positive and negative sequence voltage and the dq-axis component of the positive and negative sequence voltage delayed by half cycle, and dividing by 2 to obtain the dq-axis component of the corrected positive and negative sequence voltage; an alpha control voltage and a beta control voltage are obtained through calculation; and performing SVPWM module modulation on the alpha control voltage and the beta control voltage to output a driving signal. According to the invention, 50 Hz components of the positive and negative sequences Ugd and Ugq are filtered by using a half-period delay method, so that the waveform of the control voltage is ensured to be normal, no cost is increased on the basis of a conventional rectification control strategy, and the method is simple and practical.

Description

Technical Field

[0001] The present invention relates to the field of hydrogen production power supply, and in particular to a zero-drift rectification control method based on an IGBT hydrogen production power supply. Background Art

[0002] In recent years, with the promotion of energy transformation, greenhouse gas emission reduction and renewable energy, the hydrogen production industry has been increasingly widely used. In order to obtain better power quality and efficiency, the current mainstream hydrogen production power sources all use IGBT to implement AD / DC functions. However, the sampling signal of the hardware control board will be affected by noise, temperature, power supply fluctuations, device accuracy mismatch, and long-term aging effects, which will produce random zero drift components. The hydrogen production power supply is connected to a three-phase three-wire power supply, and there is no zero-sequence component in the real grid voltage. The wrong grid voltage signal will cause the algorithm module to output an incorrect control voltage, which will cause the three-phase bridge arm current to be unbalanced in the entire algorithm control loop, thereby causing the unit to overheat and overcurrent.

[0003] The conventional zero drift correction method is to disconnect the grid voltage when the machine is shut down, and the host computer modifies the zero drift value to set the grid voltage measurement value to 0. This method requires disconnecting the grid voltage, which can only solve the zero drift caused by insufficient precision of the conditioning circuit, but cannot solve the zero drift caused by noise, temperature, power supply fluctuations, etc. during grid-connected operation. At the same time, the conditions for disconnecting the grid voltage may not be available on site. The conventional zero drift correction method has certain limitations, and a simpler and more practical method is needed to suppress the control problems caused by zero drift of grid voltage sampling. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a zero-drift rectification control method based on an IGBT hydrogen production power supply.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A first aspect of the present invention provides a zero-drift rectification control method based on an IGBT hydrogen production power supply, comprising the following steps:

[0007] Collect DC bus voltage, three-phase grid voltage and three-phase grid current;

[0008] The three-phase grid voltage and the three-phase grid current are used to perform voltage positive and negative sequence separation and current positive and negative sequence separation respectively, so as to obtain the dq axis components of the positive and negative sequence voltage and the dq axis components of the positive and negative sequence current;

[0009] The dq-axis components of the positive and negative sequence voltages and the dq-axis components of the positive and negative sequence voltages delayed by half a cycle are added and then divided by 2 to obtain the dq-axis components of the corrected positive and negative sequence voltages;

[0010] Performing rectification calculation using the DC bus voltage, the dq axis components of the corrected positive and negative sequence voltages, and the dq axis components of the positive and negative sequence currents to obtain an alpha control voltage and a beta control voltage;

[0011] The alpha control voltage and the beta control voltage are modulated by an SVPWM module to output a driving signal.

[0012] Furthermore, the IGBT hydrogen production power supply includes: an IGBT hydrogen production electrolyzer, a DC / DC module, an AC / DC module and a three-phase power grid connected in sequence, and the DC bus voltage is the voltage U between the DC / DC module and the AC / DC module. dc , the output drive signal is output to the AC / DC module.

[0013] Furthermore, the dq-axis components of the positive and negative sequence voltages include the d-axis component of the positive sequence voltage The q-axis component of the positive sequence voltage The d-axis component of the negative sequence voltage The q-axis component of the negative sequence voltage

[0014] The dq-axis components of the modified positive and negative sequence voltages include the d-axis component of the modified positive sequence voltage Correction of the q-axis component of the positive sequence voltage Correction of the d-axis component of the negative sequence voltage Correction of the q-axis component of the negative sequence voltage

[0015] The dq axis components of the positive and negative sequence currents include the d axis component of the positive sequence current The q-axis component of the positive sequence current The d-axis component of the negative sequence current The q-axis component of the negative sequence current

[0016] Further, the dq-axis components of the DC bus voltage, the modified positive and negative sequence voltages, and the dq-axis components of the positive and negative sequence currents are used for rectification calculation to obtain the alpha control voltage and the beta control voltage, including:

[0017] The DC bus voltage, the dq axis components of the corrected positive and negative sequence voltages, and the dq axis components of the positive and negative sequence currents are used to perform four-way calculations to obtain the positive and negative sequence dq axis rectified voltages.

[0018] The positive and negative sequence dq axis rectified voltage Perform coordinate system transformation respectively to obtain the positive sequence alpha control voltage u in the rotating coordinate system α_p , positive sequence beta control voltage u β_p, negative sequence alpha control voltage u α_n , negative sequence beta control voltage u β_n ;

[0019] The positive sequence alpha control voltage u α_p and negative sequence alpha control voltage u α_n Add the alpha control voltage and the positive sequence beta control voltage u β_p and negative sequence beta control voltage u β_n Add together to get the beta control voltage.

[0020] Furthermore, the DC bus voltage, the dq axis components of the corrected positive and negative sequence voltages, and the dq axis components of the positive and negative sequence currents are used to perform four-way calculations to obtain the positive and negative sequence dq axis rectified voltages. The four-way calculations include:

[0021] The first calculation includes: dc With DC voltage reference Deviation calculation and PI adjustment are performed to obtain the first active current reference value Set the first active current reference value and the d-axis component of the positive sequence current Deviation calculation and PI adjustment are performed to obtain the first active voltage reference value, and the first active voltage reference value and the d-axis component of the corrected positive sequence voltage are converted into Calculate the deviation and get the positive sequence d-axis rectified voltage

[0022] The second calculation includes: taking the second active current reference value and the q-axis component of the positive sequence current Deviation calculation and PI adjustment are performed to obtain the second active voltage reference value, and the second active voltage reference value and the q-axis component of the corrected positive sequence voltage are converted into Calculate the deviation and get the positive sequence q-axis rectified voltage

[0023] The third calculation includes: taking the third active current reference value and the d-axis component of the negative sequence current Deviation calculation and PI adjustment are performed to obtain the third active voltage reference value, and the third active voltage reference value and the d-axis component of the modified negative sequence voltage are converted into Calculate the deviation and get the negative sequence d-axis rectified voltage

[0024] The fourth calculation includes: taking the fourth active current reference value and the q-axis component of the negative sequence current Deviation calculation and PI adjustment are performed to obtain the fourth active voltage reference value, and the fourth active voltage reference value and the q-axis component of the modified negative sequence voltage are converted into Calculate the deviation and get the negative sequence q-axis rectified voltage

[0025] Furthermore, the third active current reference value and the fourth active current reference value The default is 0.

[0026] The beneficial effects of the present invention are:

[0027] In this exemplary embodiment, a half-cycle delay method is used to filter out the 50Hz components of the positive and negative sequences Ugd and Ugq, thereby ensuring that the control voltage waveform is normal and ultimately ensuring that the bridge arm current has no waveform distortion. This method is simple and practical without adding any cost to the conventional rectification control strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A circuit diagram of a zero-drift rectification control method based on an IGBT hydrogen production power supply provided in an exemplary embodiment of the present invention;

[0029] Figure 2 A schematic diagram of a calculation process for dq-axis components of positive and negative sequence voltages provided in an exemplary embodiment of the present invention;

[0030] Figure 3 A schematic flow chart of the entire system provided in an exemplary embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the dq axis components of a power grid before and after the introduction of a zero-drift rectification control method based on an IGBT hydrogen production power supply provided in an exemplary embodiment of the present invention;

[0032] Figure 5 The voltage and current waveforms before and after the introduction of the zero-drift rectification control method based on the IGBT hydrogen production power supply provided in an exemplary embodiment of the present invention are shown. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the directions or positional relationships indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are directions or positional relationships based on the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] See also Figure 1 , Figure 1 A circuit diagram of a zero-drift rectification control method based on an IGBT hydrogen production power supply provided in an exemplary embodiment of the present invention is shown, comprising the following steps:

[0038] Collect DC bus voltage, three-phase grid voltage and three-phase grid current;

[0039] The three-phase grid voltage and the three-phase grid current are used to perform voltage positive and negative sequence separation and current positive and negative sequence separation respectively, so as to obtain the dq axis components of the positive and negative sequence voltage and the dq axis components of the positive and negative sequence current;

[0040] The dq-axis components of the positive and negative sequence voltages and the dq-axis components of the positive and negative sequence voltages delayed by half a cycle are added and then divided by 2 to obtain the dq-axis components of the corrected positive and negative sequence voltages;

[0041] Performing rectification calculation using the DC bus voltage, the dq axis components of the corrected positive and negative sequence voltages, and the dq axis components of the positive and negative sequence currents to obtain an alpha control voltage and a beta control voltage;

[0042] The alpha control voltage and the beta control voltage are modulated by an SVPWM module to output a driving signal.

[0043] Specifically, the traditional AC / DC control is to collect the grid voltage to separate the positive and negative sequences and then perform phase locking, and use the DC voltage outer loop and the current inner loop to output the positive and negative sequence dq axis control voltage, which are respectively inversely transformed to the two-phase static coordinate system, and the positive and negative sequence alpha and beta control voltages are added and then output through the three-level SVPWM module to output the power module drive signal. In the prior art, when there is zero drift in the grid voltage, after the three-phase to two-phase rotating coordinate system, a 50Hz fluctuation will be generated in Ugd and Ugq (dq axis components of positive and negative sequence voltage) of the dq coordinate system. Ugd and Ugq will be used as the feedforward items of the current loop, so that a 50Hz fluctuation will also appear in the dq axis control voltage, which will cause the three-phase control voltage to be distorted, resulting in the distortion of the three-phase bridge arm current.

[0044] In this exemplary embodiment, in the process of calculating the dq axis components of the positive and negative sequence voltages, as shown in FIG. Figure 2 As shown, the calculated dq-axis components of the positive and negative sequence voltages (the d-axis component of the positive sequence voltage The q-axis component of the positive sequence voltage The d-axis component of the negative sequence voltage The q-axis component of the negative sequence voltage ) is delayed for half a cycle (for example, 10ms) and averaged with each other to obtain the dq-axis components of the corrected positive and negative sequence voltages, which are then added to the current loop feedforward term, thereby cleverly eliminating the 50Hz fluctuation effect caused by the zero drift of the grid voltage.

[0045] Therefore, in this exemplary embodiment, a half-cycle delay method is used to filter out the 50Hz components of the positive and negative sequences Ugd and Ugq, thereby ensuring that the control voltage waveform is normal and ultimately ensuring that the bridge arm current has no waveform distortion. This method is simple and practical and does not increase any cost on the basis of conventional rectification control strategies.

[0046] It should be noted that some prior arts use current averaging, while this exemplary embodiment uses voltage averaging. The current needs to be controlled by PI, which makes the calculation complicated, while the voltage only needs to be averaged at two points, and does not need to be directly added to the output voltage through PI, which makes the calculation direct and simple. In addition, some prior arts add all points of 20ms together to calculate the average, while this exemplary embodiment only adds the current voltage and the voltage 10ms ago to calculate the average at two points, which makes the implementation method simpler.

[0047] More preferably, in an exemplary embodiment, Figure 1 As shown, the IGBT hydrogen production power supply includes: an IGBT hydrogen production electrolyzer, a DC / DC module, an AC / DC module and a three-phase power grid connected in sequence, and the DC bus voltage is the voltage U between the DC / DC module and the AC / DC module. dc , the output drive signal is output to the AC / DC module.

[0048] Specifically, in this exemplary embodiment, the red dotted line portion is the electrical portion of the IGBT hydrogen production power supply, including the IGBT hydrogen production electrolyzer, DC / DC module, AC / DC module and three-phase power grid connected in sequence. The blue portion is the hydrogen production power supply control system, which collects the three-phase grid line voltage, three-phase bridge arm current, DC bus voltage and DC bridge arm current.

[0049] More preferably, in an exemplary embodiment, if Figure 1 As shown, the dq-axis components of the positive and negative sequence voltages include the d-axis component of the positive sequence voltage The q-axis component of the positive sequence voltage The d-axis component of the negative sequence voltage The q-axis component of the negative sequence voltage

[0050] The dq-axis components of the modified positive and negative sequence voltages include the d-axis component of the modified positive sequence voltage Correction of the q-axis component of the positive sequence voltage Correction of the d-axis component of the negative sequence voltage Correction of the q-axis component of the negative sequence voltage

[0051] The dq axis components of the positive and negative sequence currents include the d axis component of the positive sequence current The q-axis component of the positive sequence current The d-axis component of the negative sequence current The q-axis component of the negative sequence current

[0052] The input is the three-phase alternating current in the factory, and the output is a direct current voltage, so the hydrogen production power supply will first convert the factory's three-phase alternating current into a direct current voltage through AC-DC, and then convert the direct current voltage into variable direct current to drive the hydrogen production electrolyzer.

[0053] More preferably, in an exemplary embodiment, Figure 1 As shown, the alpha control voltage and the beta control voltage are obtained by rectifying and calculating the DC bus voltage, the dq axis components of the modified positive and negative sequence voltages, and the dq axis components of the positive and negative sequence currents, including:

[0054] The DC bus voltage, the dq axis components of the corrected positive and negative sequence voltages, and the dq axis components of the positive and negative sequence currents are used to perform four-way calculations to obtain the positive and negative sequence dq axis rectified voltages.

[0055] The positive and negative sequence dq axis rectified voltage Perform coordinate system transformation respectively to obtain the positive sequence alpha control voltage u in the rotating coordinate system α_p , positive sequence beta control voltage uβ_p , negative sequence alpha control voltage u α_n , negative sequence beta control voltage u β_n ;

[0056] The positive sequence alpha control voltage u α_p and negative sequence alpha control voltage u α_n Add the alpha control voltage and the positive sequence beta control voltage u β_p and negative sequence beta control voltage u β_n Add together to get the beta control voltage.

[0057] More preferably, in an exemplary embodiment, Figure 1 As shown, the DC bus voltage, the dq axis components of the corrected positive and negative sequence voltages, and the dq axis components of the positive and negative sequence currents are used to perform four-way calculations to obtain the positive and negative sequence dq axis rectified voltages. The four-way calculations include:

[0058] The first calculation includes: dc With DC voltage reference Deviation calculation and PI adjustment are performed to obtain the first active current reference value Set the first active current reference value and the d-axis component of the positive sequence current Deviation calculation and PI adjustment are performed to obtain the first active voltage reference value, and the first active voltage reference value and the d-axis component of the corrected positive sequence voltage are converted into Calculate the deviation and get the positive sequence d-axis rectified voltage

[0059] The second calculation includes: taking the second active current reference value and the q-axis component of the positive sequence current Deviation calculation and PI adjustment are performed to obtain the second active voltage reference value, and the second active voltage reference value and the q-axis component of the corrected positive sequence voltage are converted into Calculate the deviation and get the positive sequence q-axis rectified voltage

[0060] The third calculation includes: taking the third active current reference value and the d-axis component of the negative sequence current Deviation calculation and PI adjustment are performed to obtain the third active voltage reference value, and the third active voltage reference value and the d-axis component of the modified negative sequence voltage are converted into Calculate the deviation and get the negative sequence d-axis rectified voltage

[0061] The fourth calculation includes: taking the fourth active current reference value and the q-axis component of the negative sequence current Deviation calculation and PI adjustment are performed to obtain the fourth active voltage reference value, and the fourth active voltage reference value and the q-axis component of the modified negative sequence voltage are converted into Calculate the deviation and get the negative sequence q-axis rectified voltage

[0062] It should be noted that some existing technologies do not separate the positive and negative currents and do not control the negative sequence current, which may cause negative sequence current. However, the four paths in this exemplary embodiment perform positive and negative sequence control, so two more paths of negative sequence current control are introduced to control the negative sequence current to 0, further ensuring the current balance of the three-phase bridge arm.

[0063] Moreover, the four-way calculation in this exemplary embodiment not only introduces current, but also introduces voltage into the calculation. The current loop control requires voltage as a feedforward item. This exemplary embodiment cleverly filters the voltage feedforward item to eliminate the influence of voltage zero drift on control.

[0064] More preferably, in an exemplary embodiment, Figure 1 As shown, the third active current reference value and the fourth active current reference value The default is 0.

[0065] More preferably, in an exemplary embodiment, the process of the entire system is as follows Figure 3 As shown, the specific implementation is as follows:

[0066] After the control board is powered on, the effective value of the three-phase grid voltage is detected. If the effective value is less than 10, it means that the grid voltage is not connected, and the zero drift value is automatically modified to make the instantaneous value of the grid voltage close to 0; if the effective value is greater than 10, the conventional zero drift correction is automatically skipped;

[0067] Enable Figure 1 In the grid voltage zero drift suppression method shown, the IGBT hydrogen production power supply sets the bus voltage and issues a hydrogen production power supply start-up command. The controller of the hydrogen production power supply suppresses the grid voltage zero drift in real time, and successively goes through three stages: pre-charging, soft grid connection, and grid connection operation, and runs the bus voltage to the set voltage.

[0068] The dq axis voltages with and without the grid voltage zero drift suppression algorithm enabled during normal grid-connected operation are shown in the attached figure. Figure 4 As shown, the grid voltage, three-phase bridge arm current and bus voltage are as follows Figure 5 As shown. Figure 4 It can be seen that after the algorithm is disabled, both the positive and negative sequence dq axis voltages will fluctuate by 50Hz, which will lead to Figure 4 The three-phase bridge arm current and bus voltage are unbalanced when the algorithm is disabled. Figure 4 and Figure 5 The waveform is normal. There is zero drift fluctuation before enabling, and it is smooth after enabling.

[0069] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A zero-drift rectification control method based on an IGBT hydrogen production power supply, characterized in that: The following steps are involved: Collect DC bus voltage, three-phase grid voltage and three-phase grid current; The three-phase grid voltage and the three-phase grid current are used to perform voltage positive and negative sequence separation and current positive and negative sequence separation respectively, so as to obtain the dq axis components of the positive and negative sequence voltage and the dq axis components of the positive and negative sequence current; The dq-axis components of the positive and negative sequence voltages and the dq-axis components of the positive and negative sequence voltages delayed by half a cycle are added and then divided by 2 to obtain the dq-axis components of the corrected positive and negative sequence voltages; Performing rectification calculation using the DC bus voltage, the dq axis components of the corrected positive and negative sequence voltages, and the dq axis components of the positive and negative sequence currents to obtain an alpha control voltage and a beta control voltage; The alpha control voltage and the beta control voltage are modulated by an SVPWM module to output a driving signal.

2. According to claim 1, a zero-drift rectification control method based on an IGBT hydrogen production power supply is characterized in that: The IGBT hydrogen production power supply includes: an IGBT hydrogen production electrolyzer, a DC / DC module, an AC / DC module and a three-phase power grid connected in sequence, and the DC bus voltage is the voltage U between the DC / DC module and the AC / DC module. dc , the output drive signal is output to the AC / DC module.

3. A zero-drift rectification control method based on an IGBT hydrogen production power supply according to claim 1 or 2, characterized in that: The dq-axis components of the positive and negative sequence voltages include the d-axis component of the positive sequence voltage The q-axis component of the positive sequence voltage The d-axis component of the negative sequence voltage The q-axis component of the negative sequence voltage The dq-axis components of the modified positive and negative sequence voltages include the d-axis component of the modified positive sequence voltage Correction of the q-axis component of the positive sequence voltage Correction of the d-axis component of the negative sequence voltage Correction of the q-axis component of the negative sequence voltage The dq axis components of the positive and negative sequence currents include the d axis component of the positive sequence current The q-axis component of the positive sequence current The d-axis component of the negative sequence current The q-axis component of the negative sequence current 4. According to claim 3, a zero-drift rectification control method based on an IGBT hydrogen production power supply is characterized in that: The method of using the DC bus voltage, the dq axis components of the modified positive and negative sequence voltages, and the dq axis components of the positive and negative sequence currents to perform rectification calculations to obtain the alpha control voltage and the beta control voltage includes: The DC bus voltage, the dq axis components of the corrected positive and negative sequence voltages, and the dq axis components of the positive and negative sequence currents are used to perform four-way calculations to obtain the positive and negative sequence dq axis rectified voltages. The positive and negative sequence dq axis rectified voltage Perform coordinate system transformation respectively to obtain the positive sequence alpha control voltage u in the rotating coordinate system α_p , positive sequence beta control voltage u β_p , negative sequence alpha control voltage u α_n , negative sequence beta control voltage u β_n ; The positive sequence alpha control voltage u α_p and negative sequence alpha control voltage u α_n Add the alpha control voltage and the positive sequence beta control voltage u β_p and negative sequence beta control voltage u β_n Add together to get the beta control voltage.

5. A zero-drift rectification control method based on an IGBT hydrogen production power supply according to claim 4, characterized in that: The DC bus voltage, the dq axis components of the corrected positive and negative sequence voltages, and the dq axis components of the positive and negative sequence currents are used to perform four-way calculations to obtain the positive and negative sequence dq axis rectified voltages. The four-way calculations include: The first calculation includes: dc With DC voltage reference Deviation calculation and PI adjustment are performed to obtain the first active current reference value Set the first active current reference value and the d-axis component of the positive sequence current Deviation calculation and PI adjustment are performed to obtain the first active voltage reference value, and the first active voltage reference value and the d-axis component of the corrected positive sequence voltage are converted into Calculate the deviation and get the positive sequence d-axis rectified voltage The second calculation includes: taking the second active current reference value and the q-axis component of the positive sequence current Deviation calculation and PI adjustment are performed to obtain the second active voltage reference value, and the second active voltage reference value and the q-axis component of the corrected positive sequence voltage are converted into Calculate the deviation and get the positive sequence q-axis rectified voltage The third calculation includes: taking the third active current reference value and the d-axis component of the negative sequence current Deviation calculation and PI adjustment are performed to obtain the third active voltage reference value, and the third active voltage reference value and the d-axis component of the modified negative sequence voltage are converted into Calculate the deviation and get the negative sequence d-axis rectified voltage The fourth calculation includes: taking the fourth active current reference value and the q-axis component of the negative sequence current Deviation calculation and PI adjustment are performed to obtain the fourth active voltage reference value, and the fourth active voltage reference value and the q-axis component of the modified negative sequence voltage are converted into Calculate the deviation and get the negative sequence q-axis rectified voltage 6. A zero-drift rectification control method based on an IGBT hydrogen production power supply according to claim 5, characterized in that: The third active current reference value and the fourth active current reference value The default is 0.

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