A system power flow control method based on voltage phase adjustment of double-shaft excitation motor

Abstract

This invention discloses a system power flow control method based on voltage phase regulation of a dual-axis exciter motor. The technical solution adopted in this invention is as follows: A physical model based on a dual-axis exciter motor and a series transformer is established, such that the actual active power and reactive power on the target line change with the variations in the d-axis and q-axis excitation currents of the dual-axis exciter motor; a ring network power system model based on power flow control of the dual-axis exciter motor is established, and the operating parameters of the ring network power system are measured by running the model; given the target active power and target reactive power on the target line, the relationship between the actual active power and actual reactive power and the target active power and target reactive power is compared; based on the difference between the actual active power and actual reactive power and the target active power and target reactive power, the d-axis and q-axis excitation currents of the dual-axis exciter motor are adjusted to achieve power flow control on the system line.

Description

Technical Field

[0001] This invention belongs to the field of power grid power flow control technology, and in particular, it is a system power flow control method based on voltage phase regulation of a dual-axis exciter motor. Background Technology

[0002] Currently, the power system faces challenges such as rapid load growth, the integration of new energy sources into the grid, and the commissioning of ultra-high voltage AC / DC transmission lines. These factors place higher demands on the rapid and precise control of power flow. Power flow control methods primarily rely on power electronic equipment, such as Static Var Compensators (SVCs), Static Synchronous Compensators (STATCOMs), and AC / DC Converters. Among these, Unified Power Flow Controllers (UPFCs) have received significant attention and development due to their rapid and flexible control methods. With the further development of power grids with high proportions of new energy and power electronics, new energy sources, such as wind and solar power, inherently exhibit uncertainties and intermittent power generation. Simultaneously, power electronic equipment suffers from drawbacks such as poor tolerance and weak inertia support. This further leads to insufficient inertia in the power system, posing challenges to system stability. To address the "insufficient grid inertia" problem accompanying current grid construction, synchronous motors can be used to replace the role of power electronic equipment. Dual-shaft excitation motors inherently possess significant inertia, and their excitation control is relatively flexible. Therefore, they can both meet the need for providing inertia support to the power system and achieve the purpose of regulating system power flow.

[0003] A characteristic of traditional synchronous generators is that only the excitation winding of the d-axis is adjustable, which limits its excitation range. The power regulation and operational stability of traditional synchronous generators are related to the angle between the generator's excitation electromotive force and the grid voltage, that is, to the generator's power angle. This characteristic effectively limits the range of operational stability.

[0004] Unlike traditional synchronous generator rotor structures, dual-shaft excitation synchronous generators have excitation windings on both the longitudinal (d-axis) and transverse (q-axis) of the rotor. By independently adjusting the current in the two sets of excitation windings on the d and q axes, the excitation magnetomotive force can be positioned at any position relative to the rotor, thereby increasing the range of operational stability. When the directions of the excitation currents on the d and q axes change, the combined excitation magnetomotive force can be located at any position between 0° and 360°. This ability to operate at high power angles allows the dual-shaft excitation synchronous generator to continue operating even after power system faults occur and conventional generators are taken out of service. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a system power flow control method based on voltage phase regulation of a dual-axis excitation motor. The method changes the sign of the excitation voltage of the input d-axis and q-axis excitation windings by a dual-axis excitation synchronous motor, so that the dual-axis excitation motor can operate in four quadrants. Under transient and steady-state conditions, the power flow on the system line is controlled by coordinating the regulation of the d-axis and q-axis excitation current or excitation voltage.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a system power flow control method based on voltage phase regulation of a dual-axis exciter motor, comprising:

[0007] A physical model based on a dual-axis exciter motor and a series transformer is established so that the actual active power P and actual reactive power Q on the target line will change with the excitation current of the dual-axis exciter motor along the d and q axes.

[0008] A ring network power system model based on power flow control of a dual-axis exciter motor was established, and the operating parameter values ​​of the ring network power system were measured by running the ring network power system model.

[0009] By comparing the actual active power P and actual reactive power Q with the target active power P0 and target reactive power Q0 on the target line, the relationship between the actual active power P and actual reactive power Q and the target active power P0 and target reactive power Q0 is determined.

[0010] Based on the differences between the actual active power P, actual reactive power Q and the target active power P0, target reactive power Q0, the excitation currents i of the d and q axes of the dual-axis excitation motor are calculated. fd and i fq Adjustments are made to control the power flow of the target line.

[0011] Furthermore, the physical model based on the dual-shaft excitation motor and series transformer includes the dual-shaft excitation motor and the series transformer; wherein, the three phases of the stator winding circuit of the dual-shaft excitation motor are respectively connected in series to the secondary side of the transformer secondary side, and connected in series to the power grid line via the primary side of the transformer primary side.

[0012] Furthermore, the physical model based on the dual-axis excitation motor and series transformer has a symmetrical structure for its two independent d-axis and q-axis excitation windings, resulting in a controllable motor output voltage. The output voltage amplitude is determined by the magnitude of the excitation current synthesized from the two sets of d-axis and q-axis excitation currents. The voltage phase is affected by the angle between the d-axis and q-axis excitation currents. Under no-load conditions, the phase of the motor output voltage is the angle between the d-axis and q-axis excitation currents. By changing the sign of the excitation current input to the d-axis and q-axis excitation windings, the dual-axis excitation motor can operate in four quadrants.

[0013] Furthermore, the ring network power system model based on dual-axis excitation motor power flow control includes a ring network model composed of three infinite systems and the physical model based on the dual-axis excitation motor and series transformer.

[0014] Furthermore, the operating parameter values ​​of the system include: the d-axis excitation current, q-axis excitation current, d-axis stator voltage, q-axis stator voltage, actual active power P of the target line, and actual reactive power Q of the target line.

[0015] Furthermore, the relationship between actual active power P, actual reactive power Q, and target active power P0, target reactive power Q0 includes:

[0016] There is a difference ΔP between the actual active power P and the target active power P0, and there is a difference ΔQ between the actual reactive power Q and the target reactive power Q0.

[0017] The actual active power P is equal to the target active power P0, and there is a difference ΔQ between the actual reactive power Q and the target reactive power Q0.

[0018] There is a difference ΔP between the actual active power P and the target active power P0, and the actual reactive power Q is equal to the target reactive power Q0.

[0019] Furthermore, when there is a difference ΔP between the actual active power P and the target active power P0, and a difference ΔQ between the actual reactive power Q and the target reactive power Q0, the target value u of the d-axis stator voltage is obtained by inputting the differences ΔP and ΔQ and adjusting the PI controller. d0 and the target value u of the q-axis stator voltage q0 ; the actual value of the stator voltage u along the d-axis d and the actual value of the q-axis stator voltage u q The target value u of the d-axis stator voltage d0 and the target value u of the q-axis stator voltage q0 The difference between them is used to obtain the d-axis excitation current i through PI regulation. fd target value i fd0 and the target value i of the q-axis excitation current fq0 Finally, by controlling the d-axis excitation current i fd and q-axis excitation current i fq The adjustment enables the adjustment of the actual active power P and the actual reactive power Q on the system lines.

[0020] Furthermore, based on the mathematical model of the dual-shaft excitation motor and its output-side mathematical model, considering steady-state conditions, the actual active power P and actual reactive power Q transmitted on the line are determined by the d-axis excitation current i of the rotor excitation current of the dual-shaft excitation motor. fd and q-axis excitation current ifq The resulting formula is as follows:

[0021]

[0022] In the formula, ω is the synchronous speed; x ad and x aq U1 and U2 are the mutual inductance of the stator d-axis equivalent winding and rotor winding, respectively, and the mutual inductance of the stator q-axis equivalent winding and rotor winding, respectively; U1 and U2 are the bus voltages on the left and right sides of the line connected to the power flow controller, respectively; R se and L se The equivalent resistance and inductance at the output side of the dual-shaft exciter motor are given by r; the stator winding resistance is given by k. se For series transformer turns ratio; k iq =ωL se +ωx q k id =ωL se +ωx d k1 = R se +r, k2=k1 2 +k id +k iq ;U 1d U 1q These represent the d-axis and q-axis components of the bus voltage U1, respectively; x d x q These are the d-axis armature reaction reactance and the q-axis armature reaction reactance of the stator winding, respectively.

[0023] Furthermore, when the actual active power P equals the target active power P0, and there is a difference ΔQ between the actual reactive power Q and the target reactive power Q0, under steady-state conditions, the magnitudes of the d-axis excitation current and the q-axis excitation current are adjusted simultaneously. Specifically, the actual active power P on the line is kept constant, and only the actual reactive power Q on the line is adjusted. When the actual reactive power Q is less than the target reactive power Q0, the d-axis excitation current i is reduced. fd The size of the q-axis excitation current i is increased simultaneously. fq The magnitude of the reactive power; when the actual reactive power Q is greater than the target reactive power Q0, increase the d-axis excitation current i. fd The size of the q-axis excitation current i is reduced. fq Size.

[0024] Furthermore, when there is a difference ΔP between the actual active power P and the target active power P0, and the actual reactive power Q equals the target reactive power Q0, considering steady-state conditions, the magnitudes of the d-axis excitation current and the q-axis excitation current are adjusted simultaneously. Specifically, the actual reactive power Q on the line is kept constant, and only the actual active power P on the line is adjusted. When the actual active power P is less than the target active power P0, the d-axis excitation current i is increased. fd The size of the q-axis excitation current i is increased simultaneously. fq The magnitude of the active power P; when the actual active power P is greater than the target active power P0, reduce the d-axis excitation current i. fd The size of the q-axis excitation current i is reduced at the same time. fq Size.

[0025] The beneficial effects of this invention are as follows: This invention enables the dual-axis excitation synchronous motor to operate in four quadrants by changing the positive and negative signs of the excitation voltage of the input d and q axis excitation windings; under transient and steady-state conditions, the power flow on the system line is controlled by coordinating the adjustment of the d and q axis excitation current or excitation voltage. Attached Figure Description

[0026] Figure 1 This is a flowchart of the method for regulating the active and reactive power of a line by the excitation current according to the present invention.

[0027] Figure 2 This is a physical model diagram of the dual-shaft excitation motor of the present invention;

[0028] Figure 3 This is a model diagram of a ring network power system based on power flow control of a dual-axis exciter motor according to the present invention;

[0029] Figure 4 This is a schematic diagram showing the changes in active and reactive power of line L1 with excitation current in an application example of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] This embodiment provides a system power flow control method based on voltage phase regulation of a dual-axis exciter motor, which includes:

[0032] A physical model based on a dual-axis exciter motor and a series transformer is established so that the actual active power P and actual reactive power Q on the target line will change with the excitation current of the dual-axis exciter motor along the d and q axes.

[0033] A ring network power system model based on power flow control of a dual-axis exciter motor was established, and the operating parameter values ​​of the ring network power system were measured by running the ring network power system model.

[0034] By comparing the actual active power P and actual reactive power Q with the target active power P0 and target reactive power Q0 on the target line, the relationship between the actual active power P and actual reactive power Q and the target active power P0 and target reactive power Q0 is determined.

[0035] Based on the differences between the actual active power P, actual reactive power Q and the target active power P0, target reactive power Q0, the excitation currents i of the d and q axes of the dual-axis excitation motor are calculated. fd and i fq Adjustments are made to control the power flow of the target line.

[0036] The physical model based on a dual-shaft excitation motor and a series transformer includes a dual-shaft excitation motor and a series transformer; wherein, the rotor circuit of the dual-shaft excitation motor includes a d-axis excitation winding circuit, a q-axis excitation winding circuit, and a damping circuit; the three phases of the stator winding circuit are connected in series to the secondary side of the transformer, and then connected in series to the power grid line via the primary side of the transformer. The physical model of the dual-shaft excitation motor is as follows: Figure 2 As shown.

[0037] The physical model based on a dual-axis excitation motor and a series transformer has two independent d-axis and q-axis excitation windings with a symmetrical structure, resulting in a controllable motor output voltage. The output voltage amplitude is determined by the magnitude of the excitation current synthesized from the two sets of d-axis and q-axis excitation currents. The voltage phase is affected by the angle between the d-axis and q-axis excitation currents. Under no-load conditions, the phase of the motor output voltage is the angle between the d-axis and q-axis excitation currents. By changing the sign of the excitation current input to the d-axis and q-axis excitation windings, the dual-axis excitation motor can operate in four quadrants.

[0038] The ring network power system model based on dual-axis excitation motor power flow control, such as Figure 3 As shown, the ring network model consists of three infinite systems and the physical model based on a dual-axis excitation motor and a series transformer.

[0039] The operating parameters of the system include: the d-axis excitation current, q-axis excitation current, d-axis stator voltage, q-axis stator voltage, actual active power P of the target line, and actual reactive power Q of the target line.

[0040] The relationships between actual active power P, actual reactive power Q, and target active power P0 and target reactive power Q0 include: There is a difference ΔP between actual active power P and target active power P0, and a difference ΔQ between actual reactive power Q and target reactive power Q0; Actual active power P equals target active power P0, and there is a difference ΔQ between actual reactive power Q and target reactive power Q0; There is a difference ΔP between actual active power P and target active power P0, and actual reactive power Q equals target reactive power Q0.

[0041] Specifically, when there is a difference ΔP between the actual active power P and the target active power P0, and a difference ΔQ between the actual reactive power Q and the target reactive power Q0, the target value u of the d-axis stator voltage is obtained by inputting the differences ΔP and ΔQ and adjusting the PI controller. d0 and the target value u of the q-axis stator voltage q0 ; the actual value of the stator voltage u along the d-axis d and the actual value of the q-axis stator voltage u q The target value u of the d-axis stator voltage d0 and the target value u of the q-axis stator voltage q0 The difference between them is used to obtain the d-axis excitation current i through PI regulation. fd target value i fd0 and the target value i of the q-axis excitation current fq0 Finally, by controlling the d-axis excitation current i fd and q-axis excitation current i fq The adjustment enables the adjustment of the actual active power P and the actual reactive power Q on the system lines.

[0042] The mathematical model of the dual-shaft excitation motor is as follows:

[0043]

[0044] In the formula, u d u q u0 and u0 are the stator voltages of the dual-axis excitation motor, representing the d-axis, q-axis, and 0-axis, respectively; i d i q i0 and i0 are the stator currents of the dual-axis exciter motor, representing the d-axis, q-axis, and 0-axis, respectively; u fd The voltage across the d-axis of the excitation winding; u fq i is the q-axis voltage of the excitation winding; fd i is the d-axis current of the excitation winding; fq i is the q-axis current of the excitation winding; D and i Q For the d-axis and q-axis currents of the damping winding; x d x qx and x0 represent the d-axis armature reaction reactance, q-axis armature reaction reactance, and 0-axis armature reaction reactance of the stator winding, respectively; x ad and x aq These are the mutual inductance of the stator d-axis equivalent winding and the rotor winding, and the mutual inductance of the stator q-axis equivalent winding and the rotor winding, respectively; x D x Q These are the d-axis and q-axis reactances of the damping winding, respectively; r is the armature resistance of the dual-axis excitation motor; r fd r fq These are the d-axis and q-axis resistances of the excitation winding, respectively; r D r Q These are the d-axis resistance and q-axis resistance of the damping winding, respectively.

[0045] In steady state:

[0046]

[0047] The mathematical model for the output side of the dual-shaft exciter motor is as follows:

[0048]

[0049] In the formula, u 12d and u 12q These are the d-axis and q-axis voltages output from the series transformer, respectively; R se and L se These are the equivalent resistance and inductance from the output side of the dual-shaft excitation motor to the series transformer, respectively.

[0050] Based on the mathematical model of the dual-axis excitation motor and its output-side mathematical model, considering steady state, the actual active power P and actual reactive power Q transmitted on the line are determined by the d-axis excitation current i of the rotor excitation current of the dual-axis excitation motor. fd and q-axis excitation current i fq The resulting formula is as follows:

[0051]

[0052] In the formula, ω is the synchronous speed; x ad and x aq U1 and U2 are the mutual inductance of the stator d-axis equivalent winding and rotor winding, respectively, and the mutual inductance of the stator q-axis equivalent winding and rotor winding, respectively; U1 and U2 are the bus voltages on the left and right sides of the line connected to the power flow controller, respectively; R se and L se The equivalent resistance and inductance at the output side of the dual-shaft exciter motor are given by r; the stator winding resistance is given by k. se For the turns ratio of a series transformer; k iq =ωL se +ωx q kid =ωL se +ωx d k1 = R se +r, k2=k1 2 +k id +k iq ;U 1d U 1q These represent the d-axis and q-axis components of busbar U1, respectively; x d x q These are the d-axis armature reaction reactance and the q-axis armature reaction reactance of the stator winding, respectively.

[0053] Specifically, when the actual active power P equals the target active power P0, and there is a difference ΔQ between the actual reactive power Q and the target reactive power Q0, under steady-state conditions, the magnitudes of the d-axis excitation current and the q-axis excitation current are adjusted simultaneously. Specifically, the actual active power P on the line is kept constant, and only the actual reactive power Q on the line is adjusted. When the actual reactive power Q is less than the target reactive power Q0, the d-axis excitation current i is reduced. fd The size of the q-axis excitation current i is increased simultaneously. fq The magnitude of the reactive power; when the actual reactive power Q is greater than the target reactive power Q0, increase the d-axis excitation current i. fd The size of the q-axis excitation current i is reduced. fq Size, adjustment method as follows Figure 1 As shown.

[0054] Specifically, when there is a difference ΔP between the actual active power P and the target active power P0, and the actual reactive power Q equals the target reactive power Q0, considering steady state, the magnitudes of the d-axis excitation current and the q-axis excitation current are adjusted simultaneously. Specifically, the actual reactive power Q on the line is kept constant, and only the actual active power P on the line is adjusted. When the actual active power P is less than the target active power P0, the d-axis excitation current i is increased. fd The size of the q-axis excitation current i is increased simultaneously. fq The magnitude of the active power P; when the actual active power P is greater than the target active power P0, reduce the d-axis excitation current i. fd The size of the q-axis excitation current i is reduced at the same time. fq Size, adjustment method as follows Figure 1 As shown.

[0055] Application examples

[0056] This application example first investigated the relationship between the output voltage and excitation of a dual-axis exciter motor. A 50MW dual-axis exciter motor model was built in simulation software, with symmetrical d-axis and q-axis parameters. Under no-load conditions, different sets of d-axis and q-axis excitation currents were given. Based on theoretical calculations and simulation results, it was found that the phase of the output voltage of the dual-axis exciter motor is consistent with the angle between the d-axis and q-axis excitation currents. The simulation results are shown in Table 1.

[0057] Table 1 Relationship between voltage output phase and input excitation current

[0058] <![CDATA[i fd (pu)]]> 1.33 1.33 1.33 1.33 1.33 1.33 1.33 <![CDATA[i fq (pu)]]> -2.30 -1.33 -0.77 0 0.77 1.33 2.30 Voltage phase (°) -60 -45 -30 0 30 45 60

[0059] The model based on a dual-shaft excitation motor and a series transformer in this application example is connected as follows: Figure 3 In the power grid system diagram shown, the dual-shaft exciter motor with this connection method can change the phase and amplitude of its output voltage within a certain range by changing the excitation current of the d-axis and q-axis excitation windings. This is equivalent to connecting a voltage source with adjustable amplitude and phase in series in the power grid.

[0060] This application example provides a topology for a power flow controller based on a dual-axis exciter motor. By providing different excitation currents to the d-axis and q-axis excitation windings, a voltage source with adjustable amplitude and phase is injected into the line. Therefore, the active power P and reactive power Q transmitted on the line can be controlled by the excitation currents id and iq of the dual-axis exciter motor's d-axis and q-axis excitation windings. fd i fq The decision was made. Figure 3 In the power grid system diagram shown, by providing different excitation currents for the d-axis and q-axis excitation windings, the active and reactive power of the lines under different operating conditions are obtained. The power flow changes of the lines connected in series with the dual-axis excitation motor are then simulated and verified. Figure 4 As shown.

[0061] As described above, the present invention has been explained in detail. Obviously, any modifications that are obvious to those skilled in the art as long as they do not substantially depart from the inventive point and effect of the present invention are also included within the protection scope of the present invention.

Claims

1. A method for system power flow control based on voltage phase adjustment of a two-axis excitation machine, characterized by, include: A physical model based on a two-axis excitation motor and a series transformer is established, so that the actual active power P and the actual reactive power Q on the target line will change with the change of the d, q-axis excitation currents of the two-axis excitation motor; A ring network power system model based on power flow control of a dual-axis exciter motor was established, and the operating parameter values ​​of the ring network power system were measured by running the ring network power system model. By specifying the target active power on the target line. P 0. Target reactive power Q 0, compared to actual active power P Actual reactive power Q With the target active power P 0. Target reactive power Q The relationship between 0; Based on actual active power P Actual reactive power Q With the target active power P 0. Target reactive power Q The difference of 0 corresponds to the excitation currents of the d and q axes of a dual-axis excitation motor. i fd and i fq Adjustments are made to control the power flow of the target line; The physical model based on a dual-axis excitation motor and a series transformer has two independent d-axis and q-axis excitation windings with a symmetrical structure, resulting in a controllable motor output voltage. The output voltage amplitude is determined by the magnitude of the excitation current synthesized from the two sets of d-axis and q-axis excitation currents. The voltage phase is affected by the angle between the d-axis and q-axis excitation currents. Under no-load conditions, the phase of the motor output voltage is the angle between the d-axis and q-axis excitation currents. By changing the sign of the excitation current input to the d-axis and q-axis excitation windings, the dual-axis excitation motor can operate in four quadrants. Based on the mathematical model of the dual-shaft excitation motor and its output side mathematical model, the actual active power transmitted on the line is calculated under steady-state conditions. P and actual reactive power Q The d-axis excitation current of the rotor excitation current of the dual-axis excitation motor i fd and q-axis excitation current i fq The resulting formula is as follows: In the formula, ω Synchronous speed; x ad and x aq These are the mutual inductance of the stator d-axis equivalent winding and the rotor winding, and the mutual inductance of the stator q-axis equivalent winding and the rotor winding, respectively. U 1. U 2 represents the bus voltages on the left and right sides of the lines connected to the power flow controller, respectively; R se and L se The equivalent resistance and inductance on the output side of the dual-shaft excitation motor; r This refers to the stator winding resistance. k se For series transformer turns ratio; k iq = ωL se + ωx q , k id = ωL se + ωx d , k 1= R se + r , k 2= k 1 2 + k id + k iq ; U 1d , U 1q These represent the bus voltages respectively. U 1 has d-axis and q-axis components; x d , x q These are the d-axis armature reaction reactance and the q-axis armature reaction reactance of the stator winding, respectively.

2. The system power flow control method based on dual-axis excitation motor voltage phase regulation according to claim 1, characterized in that, The physical model based on the dual-shaft excitation motor and series transformer includes the dual-shaft excitation motor and the series transformer; wherein, the three phases of the stator winding circuit of the dual-shaft excitation motor are connected in series to the secondary side of the transformer, and connected in series to the power grid line via the primary side of the transformer.

3. The system power flow control method based on voltage phase regulation of a dual-axis exciter motor according to claim 1, characterized in that, The ring network power system model based on dual-axis excitation motor power flow control includes a ring network model consisting of three infinite system systems and the physical model based on dual-axis excitation motor and series transformer.

4. The system power flow control method based on voltage phase regulation of a dual-axis excitation motor according to claim 1, characterized in that, The operating parameters of the system include: d-axis excitation current, q-axis excitation current, d-axis stator voltage, q-axis stator voltage, and the actual active power of the target line for the dual-axis excitation motor. P and the actual reactive power of the target line Q .

5. The system power flow control method based on voltage phase regulation of a dual-axis exciter motor according to claim 1, characterized in that, Actual active power P Actual reactive power Q With the target active power P 0. Target reactive power Q The relationships between 0 include: Actual active power P With the target active power P 0 has a difference Δ P Actual reactive power Q With target reactive power Q There is a difference Δ between 0 and 0. Q ; Actual active power P Equal to target active power P 0, actual reactive power Q With target reactive power Q There is a difference Δ between 0 and 0. Q ; Actual active power P With the target active power P There is a difference Δ between 0 and 0. P Actual reactive power Q Equal to target reactive power Q 0.

6. The system power flow control method based on voltage phase regulation of a dual-axis exciter motor according to claim 5, characterized in that, When the actual active power P With the target active power P 0 has a difference Δ P Actual reactive power Q With target reactive power Q There is a difference Δ between 0 and 0. Q At that time, by inputting the difference Δ P and Δ Q The target value of the d-axis stator voltage is obtained through PI regulation. u d0 and the target value of the q-axis stator voltage u q0 ; Actual value of stator voltage along the d-axis u d and the actual value of the q-axis stator voltage u q Target value of d-axis stator voltage u d0 and the target value of the q-axis stator voltage u q0 The difference between them is used to obtain the d-axis excitation current through PI regulation. i fd target value i fd0 and the target value of the q-axis excitation current i fq0 Ultimately, this is achieved by controlling the d-axis excitation current. i fd and q-axis excitation current i fq Adjustments are made to achieve control over the actual active power on the system lines. P and actual reactive power Q Adjustments.

7. The system power flow control method based on voltage phase regulation of a dual-axis exciter motor according to claim 5, characterized in that, When the actual active power P Equal to target active power P 0, actual reactive power Q With target reactive power Q There is a difference Δ between 0 and 0. Q When considering steady state, the magnitudes of the d-axis excitation current and q-axis excitation current are adjusted simultaneously. Specifically, this involves maintaining the actual active power on the line. P The actual reactive power on the line remains unchanged. Q Adjustments are made when the actual reactive power Q Less than the target reactive power Q At time 0, decrease the d-axis excitation current. i fd The size of the q-axis excitation current is increased. i fq The magnitude; when the actual reactive power Q Greater than the target reactive power Q At time 0, increase the d-axis excitation current. i fd The size of the q-axis excitation current is reduced. i fq Size.

8. The system power flow control method based on voltage phase regulation of a dual-axis exciter motor according to claim 5, characterized in that, When the actual active power P With the target active power P There is a difference Δ between 0 and 0. P Actual reactive power Q Equal to target reactive power Q 0. Considering steady-state conditions, simultaneously adjust the magnitudes of the d-axis excitation current and the q-axis excitation current. Specifically, maintain the actual reactive power on the line. Q The actual active power on the line remains unchanged. P Adjustments are made when the actual active power P Less than the target active power P At time 0, increase the d-axis excitation current. i fd The size of the q-axis excitation current is increased. i fq The size; when the actual active power P Greater than the target active power P At 0, reduce the d-axis excitation current. i fd The size of the q-axis excitation current is reduced. i fq Size.

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