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

Abstract

The application 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: obtaining the output power and reference power of a target power transmission line; inputting the output power and reference power into a hybrid power flow controller to obtain a compensation amount of an adaptive linear active disturbance rejection control VSC; wherein the VSC comprises a linear extended state observer, the linear extended state observer is used to output a state variable estimation value based on a gain parameter, and output the compensation amount based on the state variable estimation value; the gain parameter is determined according to the bandwidth of the hybrid power flow controller; and the overvoltage phenomenon of the target power transmission line is suppressed according to the compensation amount. The application can solve the problems of the lag effect and large ripple of the traditional PI regulation, can timely suppress the overvoltage phenomenon, and can reduce the ripple to realize smooth regulation.

Description

Technical Field

[0001] This invention relates to the field of power grid control technology, and in particular to an overvoltage suppression method and apparatus based on adaptive linear active disturbance rejection control. Background Technology

[0002] With the large-scale grid connection of traditional thermal power units replacing traditional renewable energy sources, the power flow dynamic control capability has been greatly reduced due to the strong randomness and volatility of the renewable energy sources. The uneven distribution of power flow in the regional power grid transmission channels has been exacerbated, and some transmission channels and sections are experiencing excessive power flow, local overvoltage, and N-1 overload. Bottlenecks in transmission sections and idle transmission capacity of lines coexist in the power grid, which seriously affects the overall power transmission and supply capacity and safety and reliability of the power grid.

[0003] To address the aforementioned issues, hybrid power flow control has become a cutting-edge and hot research topic. 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 flexible and continuous adjustment of the line impedance amplitude and phase angle over a wide range, precise and rapid power flow control can be achieved. While the phase-shifting transformer's voltage adjustment contacts progressively adjust the voltage to approach the target power, the fixed tap positions of the phase-shifting transformer result in discrete power flow regulation. Therefore, it is necessary to use the controllable voltage output of the VSC in conjunction with the PST to achieve continuous and smooth power flow regulation. By superimposing the VSC output with the PST excitation side voltage (which is either in phase or opposite), compensation for the PST power flow regulation dead zone can be achieved. Overvoltage issues can be categorized into internal and external faults in the HPFC. Internal HPFC fault categories include: ① DC-side faults (including single-pole grounding faults and two-stage short-circuit faults); ② Converter AC bus fault (single-phase ground fault). External fault categories: Single-phase, two-phase, and three-phase ground faults occur on the external grid side of the HPFC. Considering that the voltage source converter has a weak overvoltage tolerance and withstands small overvoltage stress amplitudes and short durations, when combining the phase-shifting transformer with the voltage source converter, the phase-shifting transformer is used to reduce the overvoltage generated on the VSC due to external system anomalies. 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 prevent damage to the VSC caused by external faults. For internal faults, after the protection provided by the system operates when the fault occurs, the coordinated control of the internal switches of the converter can suppress the overvoltage.

[0004] When the power flow of the line changes, the corresponding excitation transformer turns ratio of PST becomes k. M If the target power corresponds to the strain ratio k1, then the residual voltage difference between the two strain 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 regulation is a control method that eliminates errors based on errors, which has problems such as hysteresis and large ripple. Summary of the Invention

[0005] This invention provides an overvoltage suppression method and apparatus based on adaptive linear active disturbance rejection control, to solve the problems of lag and large ripple in current hybrid power flow control when performing overvoltage suppression.

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

[0007] Obtain the output power and reference power of the target transmission line;

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

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

[0011]

[0012]

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

[0014] In some possible implementations, the bandwidth of the hybrid power flow controller is calculated using the following formula:

[0015] ω c =ω c0 +kM

[0016]

[0017] Where, ω c0 The bandwidth setpoint is k; the adaptive adjustment coefficient is M; the intermediate variable is P. L2 P represents the output power. ref P is the reference power. set This refers to the power range corresponding to the change of adjacent taps of the phase-shifting transformer.

[0018] In some possible implementations, 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 as follows:

[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 This represents the gain coefficient of the hybrid power flow controller.

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

[0026] A phase-shifting transformer is used to determine the adjustment level based on the output power and reference power in order to obtain the adjustment voltage of the phase-shifting transformer.

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

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

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

[0030]

[0031] Where k1 is the voltage transformation ratio; U T1 The primary voltage of the excitation transformer; k M The voltage ratio of the current gear; k M+0.5 For the transition voltage ratio; k M+1 This is the voltage ratio for the next gear level.

[0032] In some possible implementations, overvoltage phenomena in the target transmission line are suppressed based on the compensation amount, including:

[0033] The overvoltage phenomenon of the target transmission line is suppressed based on the compensation amount of VSC, the voltage regulation amount of the phase shifting transformer, and the voltage regulation amount of VSC.

[0034] Secondly, embodiments of the present invention provide an overvoltage suppression device based on adaptive linear active disturbance rejection control, comprising:

[0035] The acquisition module is used to acquire the output power and reference power of the target transmission line;

[0036] The compensation module is used to input the output power and reference power into the hybrid power flow controller to obtain the VSC compensation amount of the voltage source converter based on adaptive linear active disturbance rejection control. The VSC includes a linear extended state observer, which is used to output the state variable prediction value based on the gain parameter and output the compensation amount based on the state variable prediction value. The gain parameter is determined according to the bandwidth of the hybrid power flow controller.

[0037] The control module is used to suppress overvoltage phenomena in the target transmission line based on the compensation amount.

[0038] This invention provides an overvoltage suppression method and apparatus based on adaptive linear active disturbance rejection control (AVRC). Compared to traditional methods, this invention uses a linear extended state observer instead of PI control in the traditional VSC method. The linear extended state observer can track state variables based on gain parameters. Based on the estimated state variables, it can predict power changes when line power flow changes, obtain compensation amounts in advance, and suppress overvoltage on the line based on the compensation amounts, thus solving the problem of lag effect in traditional PI regulation. Secondly, in traditional methods, the gain parameter is adjusted according to a set bandwidth value, which may result in excessively fast or slow response speeds, i.e., large ripple. In this invention, since the gain parameter is determined based on the bandwidth of the hybrid power flow controller, changing the controller's bandwidth enables precise adjustment of the gain parameter, thereby solving the problem of large ripple in traditional PI regulation. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1This is a flowchart illustrating the implementation of the overvoltage suppression method based on adaptive linear active disturbance rejection control provided in this embodiment of the invention.

[0041] Figure 2 This is a block diagram of the power flow structure of the VSC control line based on the overvoltage suppression method of adaptive linear active disturbance rejection control provided in the embodiments of the present invention;

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

[0043] Figure 4 This is a schematic diagram of the operation of an on-load tap changer provided in an embodiment of the present invention;

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

[0045] Figures 6A-6B This is a comparison chart of the effects of PI regulation and adaptive linear active disturbance rejection control provided in the embodiments of the present invention;

[0046] Figure 7 This is a schematic diagram of the overvoltage suppression device based on adaptive linear active disturbance rejection control provided in an embodiment of the present invention. Detailed Implementation

[0047] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0048] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0049] Figure 1 This is a flowchart illustrating the implementation of the overvoltage suppression method based on adaptive linear active disturbance rejection control provided in this embodiment of the 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 reference power into the hybrid power flow controller to obtain the VSC compensation amount of the voltage source converter based on adaptive linear active disturbance rejection control; wherein, the VSC includes a linear extended state observer, which is used to output the state variable prediction value based on the gain parameter, and output the compensation amount based on the state variable prediction value; the gain parameter is determined according to the bandwidth of the hybrid power flow controller.

[0052] Figure 2 This is a block diagram of the power flow structure of a VSC control line based on an overvoltage suppression method using adaptive linear active disturbance rejection control, provided in an embodiment of the present invention. The following is in conjunction with... Figure 2 This embodiment will be described as follows:

[0053] exist Figure 2 In the diagram, E1 and E2 are the two ends of the power supply, Z1 and Z2 are the resistors, and y(P) is the resistor. L2 ) represents output power, U S U L This indicates the voltage across the phase-shifting transformer PST, P L1 For the output power of transmission line L1, U T2 The output voltage and k of the secondary side of the phase-shifting transformer PST. M Let z1, z2, and z3 be the current voltage ratio of the PST, z1, z2, and z3 be the state variables, β1, β2, and β3 be the gain parameters of the linearly extended state observer, y be the output power, and b0 be the gain coefficient. c The bandwidth of the hybrid power flow controller; u(U2) is the compensation amount, ω0 is the bandwidth of the linearly extended state observer, and P ref k is the reference power, u0 is the output control quantity of the linear state error feedback control loop; p k d U1 is the gain coefficient of the hybrid power flow controller, U3 is the VSC regulation voltage, and U4 is the VSC output voltage. T1 For the primary voltage of the transformer, U qref Given the q-axis voltage component.

[0054] In this embodiment, the hybrid power flow controller includes two parts: a phase-shifting transformer (PST) and an adaptive linear active disturbance rejection control (A-LADRC) VSC. The VSC includes a linear extended state observer (LESO), a 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 to the hybrid power flow controller. The PST in the hybrid power flow controller selects an appropriate level based on the output power and reference power, and the output voltage U... p2 In other words, the phase-shifting transformer adjusts the voltage to significantly regulate the output power, bringing the line power flow close to or equal to the reference power. In practice, because the transmission channels for new energy sources are obstructed but the fluctuations are relatively small and within a certain range, a lookup table method can be used to quickly determine the PST (Power Flow Regulation) level. To obtain the lookup table, the phase-shifting transformer can be controlled to regulate the power flow independently, and the line power flow data for each level of regulation can be recorded in the table. Since the level is fixed, the regulated power flow is a fixed value. The power range corresponding to each level is set based on the data in the table. When the reference power is within a certain range, the corresponding level of the phase-shifting transformer is selected for adjustment. By selecting the power range, the phase-shifting transformer can significantly regulate the power flow to approach the reference power.

[0056] The residual power difference after PST regulation is then regulated via VSC. The voltage regulation loop in VSC outputs a fixed value, while A-LADRC outputs a compensation value.

[0057] Traditional on-load tap changers in PSTs use mechanical tap switches. During adjustment, arcing occurs between the contacts, impacting the power grid. This not only results in slow adjustment speed but also overvoltage when disconnecting the unloaded transformer. To eliminate these drawbacks, this invention combines VSC (Voltage Control System) to eliminate arcing and suppress overvoltage, achieving smooth, shock-free on-load tap change. This embodiment provides an on-load tap changer main circuit, specifically as follows... Figure 3 As shown.

[0058] In this embodiment, setting the tapping method of the voltage regulating winding to a center tapping method ensures a uniform magnetic flux distribution during short circuits, avoiding distortions in the electrodynamic distribution that might occur during voltage regulation at the winding ends, which could negatively impact the dynamic stability of the winding. Taking phase A as an example, if... Figure 3 The main circuit uses a voltage regulating circuit with two sets of switch taps (A5, A3, A1, B2, B4, B6 and A6, A4, A2, B1, B3, B5) connected via a transition resistor R and a transition switch D0. Each set of switches has 6 taps. Resistor R0 and mechanical switch D0... AB To limit the inrush current of the transformer, R can act as a current-limiting resistor to ensure that no direct short circuit occurs between the tap windings during tap changer switching. For an on-load tap-changing transformer to have good voltage regulation performance, the corresponding switches must work in coordination during tap changer switching.

[0059] The tap changer voltage adjustment process (at this point, the transformer is already operating normally) is as follows: Figure 4 Taking the circuit shown as an example, the following explanation will be provided.

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

[0061] a. Initially, A2, B2, and D0 are in the conducting state, and the transformer is operating 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, no direct short circuit occurs between the two tap windings.

[0064] d. Stop B2;

[0065] e. Turning on A1 puts both taps into operation. Due to the effect of the current-limiting resistor, no direct short circuit occurs between the two tap windings.

[0066] f. Stop A2;

[0067] g. Turning on D0 causes the current-limiting resistor R to be removed from operation, and the transformer operates in a new stable state, thus ending the voltage regulation process.

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

[0069]

[0070] A complete voltage regulation process, as described above, begins with the determination that transformer voltage regulation is needed and involves six reliable switching transitions. Each switching is timed at the zero-crossing point of the power supply voltage to avoid surges caused by system overvoltage, thus ensuring the continuity, smoothness, and lack of impact on the primary and secondary voltage waveforms. This voltage regulation method offers high reliability, a short adjustment time, and minimal winding overheating. In actual operation, the three-phase taps should be adjusted simultaneously. When performing multi-stage voltage regulation, if the taps to be adjusted are in the same group, the two groups of taps must be adjusted alternately to avoid short circuits in the transformer windings.

[0071] Figure 5This is a schematic diagram of the power flow waveform of the PST control line provided in this embodiment of the invention. The horizontal axis represents time and the vertical axis represents power. The power flow waveform changes relatively smoothly after being controlled by the PST provided in this embodiment.

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

[0073]

[0074] Where k1 is the voltage transformation ratio; U T1 k is the primary voltage of the transformer. M The voltage ratio of the current gear; k M+0.5 For the transition voltage ratio; k M+1 For the next voltage level ratio, k P The parameter k represents the proportional adjustment. I Together with S, k represents the integral element. I This represents the parameters of the integral element.

[0075] Given that traditional VSC uses PI regulation, and that PI circuitry has inherent defects, in order to eliminate arcing, suppress overvoltage, improve response speed, and achieve shock-free step-by-step on-load regulation, the traditional PI regulation is replaced by a method of compensating through adaptive linear active disturbance rejection control of the VSC output.

[0076] Specifically, in this embodiment of the invention, while determining the PST level, the VSC is adjusted to compensate and output the VSC adjustment voltage and compensation amount.

[0077] Correspondingly, the compensation amount can be determined through the linear state error feedback control loop in VSC.

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

[0079]

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

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

[0082] Considering that a second-order system can be represented as:

[0083]

[0084] Where 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 poles of the system are set at -ω. c Obtained from:

[0086] s 2 +k d s+k p =(s+ω c ) 2

[0087] Accordingly, we can obtain:

[0088]

[0089] The bandwidth ω of the hybrid power flow controller c It is closely related to the speed of system response, but only by giving ω c Numerical values ​​are difficult to use for rapid and precise system adjustments, and may result in issues with response times that are either too fast or too slow.

[0090] To address the aforementioned issues, this system employs an adaptive bandwidth adjustment method. This involves real-time acquisition of the difference between the system's line power flow (output power) and the reference power, and comparing this difference with the bandwidth setpoint ω. c0 By comparing and changing the system bandwidth, precise adjustment can be achieved. Since two adjacent settings in PST adjust the power flow correspond to a power range, the setpoint is defined as P. set .make:

[0091] ω c =ω c0 +kM

[0092] in:

[0093]

[0094] Where k is the adaptive adjustment coefficient; M is the intermediate variable; P L2 P represents the output power. ref P is the reference power. set This refers to the power range corresponding to the change of adjacent taps of the phase-shifting transformer.

[0095] As an adaptive adjustment coefficient, considering that the system power flow and reference power are within a certain range, k can be set to... 5 P set =5. When the system is first put into operation, the line power needs to change from zero. A larger system bandwidth will result in a faster response. When the difference between the system line power flow and the reference value is less than the set value, the system response will be slower.

[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] Where z1, z2, and z3 are state variables; β1, β2, and β3 are the gain parameters of the linearly 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 tuning, the pole placement method can be used. Let the bandwidth of the linearly extended state observer be ω0, then:

[0100] s 3 +β1s 2 +β2s+β3=(s+ω0) 3

[0101] Accordingly, we can obtain:

[0102]

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

[0104] Based on the above method, the linear extended state observer can track state variables according to the gain parameter. Based on the estimated state variables, it can predict the power changes when the power flow changes, obtain the compensation amount in advance, and suppress the overvoltage of the line based on the compensation amount, thus solving the problem of lag effect in traditional PI regulation. The gain parameter is determined based on the bandwidth of the hybrid power flow controller, and improvements are made to the transformer in the PST to solve the problem of large ripple in traditional PI regulation.

[0105] 130: Suppress overvoltage phenomena in the target transmission line based on the compensation amount.

[0106] In this embodiment, after determining the compensation amount of VSC, the regulating voltage of the phase-shifting transformer, and the regulating voltage of VSC, the compensation amount and the regulating voltage of VSC are used as the regulating output voltage of VSC through SPWM technology, making them coaxial with the regulating voltage of the phase-shifting transformer. This allows the regulating output voltage of VSC to be superimposed on the regulating voltage of the phase-shifting transformer, thereby changing the value of the regulating voltage of the phase-shifting transformer. This eliminates arcing and suppresses overvoltage, improves response speed, achieves impact-free step-by-step on-load regulation, and smooths the impact-free control power flow.

[0107] Figures 6A-6BThis is a comparison chart of the effects of PI regulation and adaptive linear active disturbance rejection control provided in the embodiments of the present invention. Figure 6A The method described in this embodiment represents the power change of the target transmission line after adaptive linear active disturbance rejection control compensation. Compared with traditional PI regulation, the power change of the target transmission line after adaptive linear active disturbance rejection control compensation is relatively stable with less ripple. Figure 6B The adaptive linear active disturbance rejection control (AID) regulates the output voltage. Compared with traditional PI regulation, the method provided in this embodiment can better solve the problem of hysteresis in traditional PI regulation, and the output ripple is smaller.

[0108] It should be understood that the sequence number of each step in the above embodiments does not imply 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 embodiments of the present invention.

[0109] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0110] Figure 7 A schematic diagram of an overvoltage suppression device based on adaptive linear active disturbance rejection control provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below:

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

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

[0113] The compensation module 72 is used to input the output power and reference power into the hybrid power flow controller to obtain the compensation amount of the adaptive linear active disturbance rejection control (VSC). The VSC includes a linear extended state observer, which is used to output the state variable prediction based on the gain parameter and output the compensation amount based on the state variable prediction. The gain parameter is determined according to the bandwidth of the hybrid power flow controller.

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

[0115] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0116] Those skilled in the art will recognize that the templates, units, and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0117] If the module / unit is implemented as 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, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the above embodiments of the overvoltage suppression method based on adaptive linear active disturbance rejection control. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0118] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within 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: Obtain the output power and reference power of the target transmission line; The output power and the reference power are input into the hybrid power flow controller to obtain the voltage source converter VSC compensation amount based on adaptive linear active disturbance rejection control; wherein, the VSC includes a linear extended state observer, which is used to output a state variable prediction value based on a gain parameter; the compensation amount is determined based on the state variable prediction value; the gain parameter is determined according to the bandwidth of the hybrid power flow controller; The overvoltage phenomenon of the target transmission line is suppressed according to the compensation amount; 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; The linear state error feedback control loop is as follows: in, The output control quantity is for the linear state error feedback control loop; , The gain coefficient of the hybrid power flow controller; The VSC also includes a voltage regulation loop; The voltage regulation loop is used to determine the VSC regulation voltage based on the regulation range of the phase-shifting transformer; The voltage regulating loop is as follows: in, This refers to the voltage transformation ratio; This refers to the primary voltage of the transformer. This represents the voltage ratio of the current gear. For the transition voltage ratio; This is the voltage ratio for the next gear level.

2. The overvoltage suppression method based on adaptive linear active disturbance rejection control according to claim 1, characterized in that, The linear expansion state observer is: in, , , For state variables; , , Here are the gain parameters of the linearly extended state observer; The output power; For gain coefficient, The bandwidth of the hybrid power flow controller; The compensation amount is... is the bandwidth of the linearly extended state observer.

3. The overvoltage suppression method based on adaptive linear active disturbance rejection control according to claim 2, characterized in that, The formula for calculating the bandwidth of the hybrid power flow controller is as follows: in, Set the bandwidth value; This is the adaptive adjustment coefficient; As an intermediate variable; The output power; The reference power; This refers to the power range corresponding to the change of adjacent taps of the phase-shifting transformer.

4. 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 level based on the output power and the reference power, so as to obtain the adjustment voltage of the phase-shifting transformer.

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

6. An overvoltage suppression device based on adaptive linear active disturbance rejection control, characterized in that, include: The acquisition module is used to acquire the output power and reference power of the target transmission line; A compensation module is used to input the output power and the reference power into a hybrid power flow controller to obtain a voltage source converter VSC compensation amount based on adaptive linear active disturbance rejection control; wherein, the VSC includes a linear extended state observer, which is used to output a state variable prediction value based on a gain parameter; the compensation amount is determined based on the state variable prediction value; the gain parameter is determined according to the bandwidth of the hybrid power flow controller; A control module is used to suppress overvoltage phenomena in the target transmission line according to the compensation amount; 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; The linear state error feedback control loop is as follows: in, The output control quantity is for the linear state error feedback control loop; , The gain coefficient of the hybrid power flow controller; The VSC also includes a voltage regulation loop; The voltage regulation loop is used to determine the VSC regulation voltage based on the regulation range of the phase-shifting transformer; The voltage regulating loop is as follows: in, This refers to the voltage transformation ratio; This refers to the primary voltage of the transformer. This represents the voltage ratio of the current gear. For the transition voltage ratio; This is the voltage ratio for the next gear level.

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