Overvoltage suppression method and device based on adaptive linear active disturbance rejection control

Abstract

The invention provides an overvoltage suppression method and device based on adaptive linear active disturbance rejection control, and belongs to the field of power grid control. The method comprises the following steps: acquiring output power and reference power of a target power transmission line; inputting the output power and the reference power into a hybrid power flow controller to obtain a compensation amount of adaptive linear active-disturbance-rejection control (VSC); wherein the VSC comprises a linear expansion state observer, and the linear expansion state observer is used for outputting a state variable estimated value based on the gain parameter and outputting a compensation amount based on the state variable estimated value; the gain parameter is determined according to the bandwidth of the hybrid power flow controller; and suppressing the overvoltage phenomenon of the target power transmission line according to the compensation amount. According to the invention, the problems of hysteresis effect and large ripple in traditional PI adjustment can be solved, the overvoltage phenomenon can be inhibited in time, and the ripple is reduced, so that stable adjustment is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid control, and in particular to an overvoltage suppression method and device based on adaptive linear active disturbance rejection control. Background Art

[0002] With the large-scale access of a high proportion of new energy to the power grid replacing traditional thermal power units, the dynamic control capability of the power flow has been greatly reduced due to its strong randomness and volatility. The uneven distribution of power flow in the transmission channels of the regional power grid has intensified. Some transmission channels and sections have excessive power flow, local overvoltage, and N-1 overload conditions are prominent. The transmission section bottlenecks and idle line transmission capacity coexist in the power grid, seriously affecting the overall power transmission and supply capacity of the power grid and the level of safety and reliability.

[0003] In order to solve the above problems, hybrid power flow control has become a frontier and hot topic in research. It combines a large-capacity dual-core symmetrical phase shifting transformer (PST) with a small-capacity voltage source converter (VSC) to form a hybrid power flow controller (HPFC). Through the flexible and continuous adjustment of the line impedance amplitude and phase angle over a wide range, the power flow can be accurately and quickly controlled. The voltage tapping contacts of the phase-shifting transformer are used to adjust the voltage step by step to approach the target power. However, since the gear of the phase-shifting transformer is fixed, the power flow is discretely adjusted. Therefore, it is necessary to use the controllable voltage output by the VSC to cooperate with the PST to achieve continuous and smooth power flow adjustment. The dead zone of the PST power flow regulation can be compensated by superimposing the voltage with the same or opposite phase of the VSC output and the PST excitation side voltage. The overvoltage problem can be divided into HPFC internal fault and external fault. HPFC internal fault categories: ① DC side fault (including single-pole grounding fault and two-stage short circuit fault); ②Converter AC bus fault (single-phase ground fault). External fault category: single-phase, two-phase and three-phase ground faults occur on the external grid side of HPFC. Considering that the voltage source converter has a weak overvoltage tolerance capability and withstands overvoltage stress with a small amplitude and short time, when the phase-shifting transformer is combined with the voltage source converter, the phase-shifting transformer is used to reduce the overvoltage generated by the external system abnormality on the VSC. For different connection methods, when the VSC is connected in series with the secondary side of the excitation transformer of the phase-shifting transformer, the coordinated control effect of the VSC and the phase-shifting transformer is better, and the phase-shifting transformer can effectively avoid damage to the VSC due to external faults; for internal faults, after the protection equipped by the system is activated when the fault occurs, the coordinated control of the internal switches of the converter can suppress the overvoltage.

[0004] When the line power flow changes, the excitation transformer ratio of the corresponding PST is k M , the target power to transformer ratio is k1, then the residual voltage difference corresponding to the two transformer ratios is the VSC output voltage value. If there is a calculation error, it is necessary to use PI to adjust and compensate in real time. However, PI adjustment is a control method based on error elimination, which has the problems of hysteresis effect and large ripple. Summary of the invention

[0005] The embodiment of the present invention provides an overvoltage suppression method and device based on adaptive linear anti-disturbance control to solve the problems of hysteresis and large ripple in the current hybrid power flow control when performing overvoltage suppression.

[0006] In a first aspect, an embodiment of the present invention provides an overvoltage suppression method based on adaptive linear active disturbance rejection control, comprising:

[0007] Obtaining output power and reference power of a target transmission line;

[0008] The output power and the reference power are input into the hybrid power flow controller to obtain a compensation amount of a voltage source converter VSC based on an adaptive linear active disturbance rejection control; wherein the VSC includes a linear extended state observer, which is used to output a state variable estimate based on a gain parameter, and output a compensation amount based on the state variable estimate; the gain parameter is determined according to the bandwidth of the hybrid power flow controller;

[0009] The overvoltage phenomenon of the target transmission line is suppressed according to the compensation amount.

[0010] In some possible implementations, the linear extended state observer is:

[0011]

[0012]

[0013] Among them, z1, z2, z3 are state variables; β1, β2, β3 are the gain parameters of the linear extended state observer; y is the output power; b0 is the gain coefficient, ω c is the bandwidth of the hybrid power flow controller; u is the compensation amount, and ω0 is the bandwidth of the linear extended state observer.

[0014] In some possible implementations, the bandwidth of the hybrid power flow controller is calculated as follows:

[0015] ω c =ω c0 +kM

[0016]

[0017] Among them, ω c0 is the bandwidth setting value; k is the adaptive adjustment coefficient; M is the intermediate variable; P L2 is the output power; P ref is the reference power; P set It is the power range corresponding to the adjacent gear changes of the phase-shifting transformer.

[0018] In some possible implementations, the VSC also includes a linear state error feedback control loop;

[0019] A linear state error feedback control loop is used to determine the compensation amount.

[0020] In some possible implementations, the linear state error feedback control loop is:

[0021]

[0022] u0=k p (P ref -z1)-k d z2

[0023]

[0024] Where u0 is the output control quantity of the linear state error feedback control loop; k p , k d is the gain coefficient of the hybrid power flow controller.

[0025] In some possible implementations, the hybrid power flow controller further includes a phase-shifting transformer;

[0026] The phase-shifting transformer is used to determine the adjustment gear based on the output power and the reference power to obtain the adjustment voltage of the phase-shifting transformer.

[0027] In some possible implementations, the VSC further includes a voltage regulation loop;

[0028] The voltage regulation loop is used to determine the VSC regulation voltage amount based on the regulation gear position of the phase-shifting transformer.

[0029] In some possible implementations, the voltage regulation loop is:

[0030]

[0031] Among them, k1 is the voltage transformation ratio; U T1 is the primary voltage of the excitation transformer; k M is the current gear voltage ratio; k M+0.5 is the transition gear voltage ratio; k M+1 It is the voltage ratio of the next gear.

[0032] In some possible implementations, suppressing the overvoltage phenomenon of the target transmission line according to the compensation amount includes:

[0033] According to the compensation amount of the VSC, the voltage adjustment amount of the phase-shifting transformer and the voltage adjustment amount of the VSC, the overvoltage phenomenon of the target transmission line is suppressed.

[0034] In a second aspect, an embodiment of the present invention provides an overvoltage suppression device based on adaptive linear active disturbance rejection control, comprising:

[0035] An acquisition module, used for acquiring the output power and reference power of the target transmission line;

[0036] A compensation module, used for inputting the output power and the reference power into the hybrid power flow controller to obtain a compensation amount of a voltage source converter VSC based on an adaptive linear active disturbance rejection control; wherein the VSC includes a linear extended state observer, the linear extended state observer is used for outputting a state variable estimate based on a gain parameter, and outputting a compensation amount based on the state variable estimate; the gain parameter is determined according to the bandwidth of the hybrid power flow controller;

[0037] The control module is used to suppress the overvoltage phenomenon of the target transmission line according to the compensation amount.

[0038] The embodiment of the present invention provides an overvoltage suppression method and device based on adaptive linear anti-disturbance control. Compared with the traditional method, the embodiment of the present invention adopts a linear extended state observer to replace the PI control in the traditional VSC method. The linear extended state observer can track the state variables according to the gain parameters. Based on the estimated state variables, it can predict the power change when the line power flow changes, obtain the compensation amount in advance, and suppress the overvoltage of the line based on the compensation amount to solve the problem of hysteresis effect in traditional PI regulation. Secondly, in the traditional method, the gain parameter is adjusted according to the set bandwidth value, which may have the problem of too fast or too slow response speed, that is, the ripple is large. In the embodiment of the present invention, since its gain parameter is determined according to the bandwidth of the hybrid power flow controller, the bandwidth of the controller can be changed to achieve accurate adjustment of the gain parameter, thereby solving the problem of large ripple in traditional PI regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1is a flow chart of an implementation of an overvoltage suppression method based on adaptive linear active disturbance rejection control provided by an embodiment of the present invention;

[0041] Figure 2 It is a structural block diagram of a VSC control line power flow of an overvoltage suppression method based on an adaptive linear active disturbance rejection control provided by an embodiment of the present invention;

[0042] Figure 3 It is a schematic diagram of the main circuit of the on-load tap changer switch provided by an embodiment of the present invention;

[0043] Figure 4 It is a working schematic diagram of the on-load voltage regulating tap changer provided by an embodiment of the present invention;

[0044] Figure 5 1 is a schematic diagram of a PST control line power flow waveform provided by an embodiment of the present invention;

[0045] Figure 6A-6B This is a comparison diagram of the effects of PI regulation and adaptive linear active disturbance rejection control regulation provided by an embodiment of the present invention;

[0046] Figure 7 It is a structural schematic diagram of an overvoltage suppression device based on adaptive linear active disturbance rejection control provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0048] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0049] Figure 1 1 is a flowchart of an implementation of an overvoltage suppression method based on adaptive linear anti-disturbance control provided by an embodiment of the present invention. Figure 1 As shown, the method includes:

[0050] 110: Obtain the output power and reference power of the target transmission line.

[0051] 120: Input the output power and the reference power into the hybrid power flow controller to obtain the voltage source converter VSC compensation amount based on the adaptive linear anti-disturbance control; wherein the VSC includes a linear extended state observer, the linear extended state observer is used to output the state variable estimate based on the gain parameter, and output the compensation amount based on the state variable estimate; the gain parameter is determined according to the bandwidth of the hybrid power flow controller.

[0052] Figure 2 The structure block diagram of the VSC control line power flow of the overvoltage suppression method based on the adaptive linear active disturbance rejection control provided by the embodiment of the present invention is as follows. Figure 2 This embodiment is described:

[0053] exist Figure 2 In the figure, E1 and E2 are the two ends of the power supply, Z1 and Z2 are the resistors, y(P L2 ) is the output power, U S , U L Represents the voltage across the phase-shifting transformer PST, P L1 is the output power of the transmission line L1, U T2 is the output voltage of the secondary side of the phase-shifting transformer PST, k M is the voltage ratio of the current gear of PST, z1, z2, z3 are state variables; β1, β2, β3 are the gain parameters of the linear extended state observer; y is the output power; b0 is the gain coefficient, ω c is the bandwidth of the hybrid power flow controller; u(U2) is the compensation amount, ω0 is the bandwidth of the linear extended state observer, P ref is the reference power, u0 is the output control quantity of the linear state error feedback control loop; k p , k d is the gain coefficient of the hybrid power flow controller, U1 is the VSC regulated voltage, U3 is the VSC output voltage, and U T1 is the transformer primary voltage, U qref is the given q-axis voltage component.

[0054] In this embodiment, the hybrid power flow controller includes a phase-shifting transformer PST and an adaptive linear active disturbance rejection control (Adaptive Linear Active Disturbance Rejection Control, A-LADRC) VSC. The VSC includes a linear extended state observer (Linear Extended State Observer, LESO), a linear state error feedback (Linear State Error Feedback, LSEF) and a voltage regulation loop. LESO and LSEF are collectively referred to as A-LADRC.

[0055] The output power and reference power are input into the hybrid power flow controller. The PST in the hybrid power flow controller selects the appropriate gear according to the output power and reference power, and the output voltage U p2 , that is, the phase-shifting transformer adjusts the voltage to adjust the output power significantly, so that the line flow is close to or equal to the reference power. Among them, in actual operation, since the new energy transmission channel is blocked but the fluctuation is small and there is a certain range, the table lookup method can be used to quickly get the gear of PST. In order to obtain the comparison table, the phase-shifting transformer can be controlled to adjust the flow separately, and the line flow data of each gear adjustment is recorded in the table. Since the gear is fixed, the adjusted flow is a fixed value, and the power interval corresponding to each gear is set according to the data in the table. When the reference power is in a certain interval adjustment range, select the gear corresponding to the phase-shifting transformer for adjustment, and make the phase-shifting transformer adjust significantly to approach the reference power through the selection of the power interval.

[0056] The remaining power difference after PST regulation is regulated by VSC, wherein the voltage regulation loop in VSC outputs a fixed value and A-LADRC outputs a compensation value.

[0057] The on-load voltage-regulating transformer in the traditional PST adopts a mechanical switch tap mode. When adjusting, an arc is generated between the contacts, which has an impact on the power grid system. Not only is the adjustment speed slow, but overvoltage is also generated when the unloaded transformer is cut. In order to eliminate the above defects, VSC is combined to eliminate arcs and suppress overvoltage to achieve smooth and impact-free on-load voltage regulation. The embodiment of the present invention provides an on-load voltage-regulating tap switch main circuit, specifically as follows Figure 3 shown.

[0058] In this embodiment, the tapping method of the voltage regulating winding is set to the middle tapping method, which can make the magnetic flux distribution uniform during short circuit and avoid the distortion of the electromotive force distribution caused by voltage regulation at the winding end, which is detrimental to the dynamic stability of the winding. Taking phase A as an example, if Figure 3 The main circuit uses two groups of switch taps (A5, A3, A1, B2, B4, B6 and A6, A4, A2, Bl, B3, B5) connected via transition resistor R and transition switch D0. Each switch group has 6 taps. Resistor R0 and mechanical switch D AB It is used to limit the closing inrush current of the transformer. R can be used as a current limiting resistor to ensure that there is no direct short circuit between the tap windings during the switching process of the tap changer. In order to make the on-load tap-changing transformer have better voltage regulation performance, it is required that the corresponding switches work in coordination when the tap changer is switched.

[0059] The tap voltage regulation process (at this time, the transformer is working normally) Figure 4 Taking the circuit shown as an example, the following description is given.

[0060] exist Figure 4 In the example, when the transformer is operating near the rated voltage, A2-B2 is conducting and the circuit breaker D AB After the transformer is put into operation, it is in the disconnected state. At this time, the voltage output on the secondary side is stable. When the output voltage needs to be increased, it is necessary to change from A2-B2 operation to A1-B1 operation. The specific shifting operation process is as follows:

[0061] a. The initial state is that A2, B2, and D0 are in the on state, and the transformer works in a stable state;

[0062] b. Stop D0 and put the current limiting resistor R into operation;

[0063] c. Turn on B1 to put both taps into operation. Due to the effect of the current limiting resistor, there is no direct short circuit between the two tap windings;

[0064] d. Stop B2;

[0065] e. Turn on A1 to put both taps into operation. Due to the effect of the current limiting resistor, there is no direct short circuit between the two tap windings;

[0066] f. Stop A2;

[0067] g. Turn on D0 to make the current limiting resistor R stop running. The transformer runs in a new stable state and the voltage regulation process ends.

[0068] The above PST shifting process can be divided into three steps: the first step, before the shift, A2, B2, and D0 are turned on; the second step, during the transition phase, A2 and B1 are turned on; the third step, A1, B1, and D0 are turned on. The output voltage of the secondary side of the excitation transformer corresponding to the three processes is U T2 :

[0069]

[0070] A complete voltage regulation process is as described above, starting from the determination of the need for transformer voltage regulation, and then undergoing 6 reliable switch changes. Each switch is selected at the zero crossing of the power supply voltage to avoid shocks caused by system overvoltage problems, thereby ensuring the continuity, smoothness and impact-free nature of the primary and secondary voltage waveforms. This voltage regulation method has high reliability, short voltage regulation process time, and less serious heating of the winding. The three-phase taps should be adjusted simultaneously during actual operation. When performing multi-stage voltage regulation and the taps to be adjusted are in the same group, in order to avoid short circuit of the transformer winding, the two groups of taps need to be adjusted alternately.

[0071] Figure 53 is a schematic diagram of a power flow waveform of a PST-controlled line provided in an embodiment of the present invention, wherein the horizontal axis is time and the vertical axis is power. The power flow waveform after being regulated by the PST provided in this embodiment changes relatively smoothly.

[0072] The voltage output by the traditional VSC is as follows:

[0073]

[0074] Among them, k1 is the voltage transformation ratio; U T1 is the primary voltage of the transformer; k M is the current gear voltage ratio; k M+0.5 is the transition gear voltage ratio; k M+1 is the voltage ratio of the next gear, k P represents the parameter of proportional adjustment, k I Together with S, k represents the integral link. I Represents the integral phase parameters.

[0075] In view of the fact that traditional VSC adopts PI for regulation and the PI link has defects, in order to eliminate arcs, suppress overvoltage, improve response speed and achieve impact-free step-by-step load regulation, the traditional PI regulation is replaced by compensation through adaptive linear anti-disturbance control of VSC output.

[0076] Specifically, in the embodiment of the present invention, while determining the PST gear position, the VSC performs compensation adjustment to output the VSC adjustment voltage and the compensation amount.

[0077] Accordingly, the compensation amount can be determined by a linear state error feedback control loop in the VSC.

[0078] The linear state error feedback control loop can be expressed as:

[0079]

[0080] u0=k p (P ref -z1)-k d z2

[0081] Among them, u0 is the output control quantity of the linear state error feedback control loop, k p , k d is the gain coefficient of the hybrid power flow controller.

[0082] Considering that the second-order system can be expressed as:

[0083]

[0084] Among them, a1 and a0 are control object parameters.

[0085] Referring to the pole placement method, let the bandwidth of the hybrid power flow controller be ω c , the closed-loop pole of the system is configured at -ω c Get:

[0086] s 2 +k d s+k p =(s+ω c ) 2

[0087] Correspondingly, we can get:

[0088]

[0089] Bandwidth of hybrid power flow controller ω c It is closely related to the rapidity of system response, but it is only based on a given ω c It is difficult to adjust the system quickly and accurately with numerical values, and there may be problems with the response speed being too fast or too slow.

[0090] In order to solve the above problems, this system adopts the method of adaptive adjustment of system bandwidth, which collects the difference between the system line power flow (output power) and the reference power in real time and compares it with the bandwidth setting value ω c0 Compare and change the system bandwidth to achieve precise regulation. Since two adjacent gears correspond to a power range when PST adjusts the power flow, the set value is defined as P set .make:

[0091] ω c =ω c0 +kM

[0092] in:

[0093]

[0094] Among them, k is the adaptive adjustment coefficient; M is the intermediate variable; P L2 is the output power; P ref is the reference power; P set It is the power range corresponding to the adjacent gear changes of the phase-shifting transformer.

[0095] is the adaptive adjustment coefficient. Considering that the system power flow and the reference power are within a certain range, k can be set to 5 , P set =5. When the system is just put into operation, the line power needs to change from zero, and the larger the system bandwidth, the faster the response; when the difference between the system line power flow and the reference value is less than the set value, the system responds slowly.

[0096] The state variables in the linear state error feedback control loop are output by the linear extended state observer in the VSC. Correspondingly, the linear extended state observer can be:

[0097]

[0098] Among them, z1, z2, z3 are state variables; β1, β2, β3 are gain parameters of the linear extended state observer; y is the output power; b0 is the gain coefficient and u is the compensation amount.

[0099] Considering the feasibility of A-LADRC in practical engineering applications and the complexity of control parameter setting, the pole placement method can be used to set the bandwidth of the linear extended state observer to ω0, and we can get:

[0100] s 3 +β1s 2 +β2s+β3=(s+ω0) 3

[0101] Correspondingly, we can get:

[0102]

[0103] Where ω0 is the bandwidth of the linear extended state observer. c is the bandwidth of the hybrid power flow controller.

[0104] Based on the above method, the linear extended state observer can track the state variables according to the gain parameters. Based on the estimated state variables, it can predict the power change when the line power flow changes, obtain the compensation amount in advance, and suppress the overvoltage of the line based on the compensation amount to solve the problem of hysteresis effect in traditional PI regulation. Determining the gain parameters based on the bandwidth of the hybrid power flow controller and improving the transformer in the PST can solve the problem of large ripple in traditional PI regulation.

[0105] 130: Suppress the overvoltage phenomenon of the target transmission line according to the compensation amount.

[0106] In this embodiment, after determining the compensation amount of the VSC, the phase-shifting transformer regulated voltage amount and the VSC regulated voltage amount, the compensation amount of the VSC and the VSC regulated voltage amount are used as the regulated output voltage amount of the VSC through the SPWM technology, so that they are coaxial with the phase-shifting transformer regulated voltage amount. The regulated output voltage amount of the VSC is superimposed on the regulated voltage amount of the phase-shifting transformer, thereby changing the value of the regulated voltage amount of the phase-shifting transformer. The arc is eliminated and the overvoltage is suppressed, the response speed is improved, and the impact-free step-by-step load regulation is achieved, and the power flow is smoothly controlled without impact.

[0107] Figure 6A-6B: is a comparison diagram of the effects of PI regulation and adaptive linear active disturbance rejection control regulation provided by an embodiment of the present invention, wherein: Fig. 6A The power change of the target transmission line after adaptive linear anti-disturbance control compensation is characterized. Compared with the traditional PI adjustment, the method provided by this embodiment makes the power change of the target transmission line after adaptive linear anti-disturbance control compensation basically stable and has small ripple. Figure 6B Characterizing the regulated output voltage of the adaptive linear anti-disturbance control, compared with the traditional PI regulation, the regulated output voltage of the adaptive linear anti-disturbance control using the method provided in this embodiment can better solve the problem of hysteresis effect in the traditional PI regulation, and the output ripple is smaller.

[0108] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0109] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0110] Figure 7 The schematic diagram of the structure of the overvoltage suppression device based on adaptive linear active disturbance rejection control provided by an embodiment of the present invention is shown. For the convenience of explanation, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0111] like Figure 7 As shown, the overvoltage suppression device 7 based on adaptive linear active disturbance rejection control includes:

[0112] An acquisition module 71 is used to acquire the output power and reference power of a target transmission line;

[0113] A compensation module 72, used for inputting the output power and the reference power into the hybrid power flow controller to obtain a compensation amount of the adaptive linear active disturbance rejection control VSC; wherein the VSC includes a linear extended state observer, the linear extended state observer is used for outputting a state variable estimate based on a gain parameter, and outputting a compensation amount based on the state variable estimate; the gain parameter is determined according to the bandwidth of the hybrid power flow controller;

[0114] The control module 73 is used to suppress the overvoltage phenomenon of the target transmission line according to the compensation amount.

[0115] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0116] Those of ordinary skill in the art will appreciate that the templates, units, and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0117] If the module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned embodiments of the overvoltage suppression method based on adaptive linear self-disturbance rejection control can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium.

[0118] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An overvoltage suppression method based on adaptive linear active disturbance rejection control, characterized in that: include: Obtaining output power and reference power of a target transmission line; The output power and the reference power are input into a hybrid power flow controller to obtain a voltage source converter VSC compensation amount based on an adaptive linear active disturbance rejection control; wherein the VSC includes a linear extended state observer, and the linear extended state observer is used to output a state variable estimate based on a gain parameter; the compensation amount is determined based on the state variable estimate; and the gain parameter is determined according to the bandwidth of the hybrid power flow controller; An overvoltage phenomenon of the target power transmission line is suppressed according to the compensation amount.

2. The overvoltage suppression method based on adaptive linear active disturbance rejection control according to claim 1 is characterized in that: The linear extended state observer is: Wherein, z1, z2, z3 are state variables; β1, β2, β3 are gain parameters of the linear extended state observer; y is the output power; b0 is the gain coefficient, ω c is the bandwidth of the hybrid power flow controller; u is the compensation amount, and ω0 is the bandwidth of the linear extended state observer.

3. The overvoltage suppression method based on adaptive linear active disturbance rejection control according to claim 2 is characterized in that: The calculation formula of the bandwidth of the hybrid power flow controller is: ω c =ω c0 +kM Among them, ω c0 is the bandwidth setting value; k is the adaptive adjustment coefficient; M is the intermediate variable; P L2 is the output power; P ref is the reference power; P set It is the power range corresponding to the adjacent gear changes of the phase-shifting transformer.

4. The overvoltage suppression method based on adaptive linear active disturbance rejection control according to claim 1 is characterized in that: The VSC also includes a linear state error feedback control loop; The linear state error feedback control loop is used to determine the compensation amount.

5. The overvoltage suppression method based on adaptive linear active disturbance rejection control according to claim 4 is characterized in that: The linear state error feedback control loop is: u0=k p (P ref -z1)-k d z2 Where u0 is the output control quantity of the linear state error feedback control loop; k p , k d is the gain coefficient of the hybrid power flow controller.

6. The overvoltage suppression method based on adaptive linear active disturbance rejection control according to claim 1, characterized in that: The hybrid power flow controller also includes a phase-shifting transformer; The phase-shifting transformer is used to determine the adjustment gear based on the output power and the reference power to obtain the phase-shifting transformer adjustment voltage.

7. The overvoltage suppression method based on adaptive linear active disturbance rejection control according to claim 1, characterized in that: The VSC also includes a voltage regulation loop; The voltage regulation loop is used to determine the VSC regulation voltage amount based on the regulation gear position of the phase-shifting transformer.

8. The overvoltage suppression method based on adaptive linear active disturbance rejection control according to claim 7 is characterized in that: The voltage regulation loop is: Among them, k1 is the voltage transformation ratio; U T1 is the primary voltage of the transformer; k M is the current gear voltage ratio; k M+0.5 is the transition gear voltage ratio; k M+1 It is the voltage ratio of the next gear.

9. The overvoltage suppression method based on adaptive linear active disturbance rejection control according to claim 1, characterized in that: The step of suppressing the overvoltage phenomenon of the target transmission line according to the compensation amount includes: The overvoltage phenomenon of the target transmission line is suppressed according to the compensation amount of the VSC, the voltage adjustment amount of the phase-shifting transformer and the voltage adjustment amount of the VSC.

10. An overvoltage suppression device based on adaptive linear active disturbance rejection control, characterized in that: include: An acquisition module, used for acquiring the output power and reference power of the target transmission line; A compensation module, used for inputting the output power and the reference power into a hybrid power flow controller to obtain a voltage source converter VSC compensation amount based on an adaptive linear active disturbance rejection control; wherein the VSC includes a linear extended state observer, and the linear extended state observer is used for outputting a state variable estimate based on a gain parameter; the compensation amount is determined based on the state variable estimate; and the gain parameter is determined according to the bandwidth of the hybrid power flow controller; A control module is used to suppress the overvoltage phenomenon of the target transmission line according to the compensation amount.

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