Simulation method, device and equipment of flexible excitation device and storage medium

Abstract

The invention belongs to the field of electric power, and discloses a simulation method, device and equipment of a flexible excitation device and a storage medium. The flexible excitation simulation model at least comprises a voltage transmission and load compensation unit, a series correction unit, a voltage regulation amplification unit, an amplitude limiting unit and a parallel correction unit connected in parallel with the voltage regulation amplification unit which are sequentially connected in series; in a voltage regulator amplitude limiting module of the amplitude limiting unit, the output upper limit and the output lower limit of a voltage regulator included in the amplitude limiting unit are adjusted according to the comparison result of the generator terminal voltage and the preset inflection point voltage, so that the strong excitation capability of the flexible excitation device under the low-voltage working condition and the top value voltage decoupling characteristic under the overvoltage working condition are simulated; and in an excitation current out-of-limit amplitude limiting module of the amplitude limiting unit, an excitation current out-of-limit amplitude limiting value is calculated according to the terminal voltage and the excitation current so as to simulate an overcurrent limiting function of a power device in the flexible excitation device.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electric power, and particularly relates to a simulation method, device and equipment of a flexible excitation device and a storage medium. BACKGROUND

[0002] Synchronous generators are the cornerstone of stable operation of power systems. With large-scale grid connection of new energy such as wind power and photovoltaic power, the weak support and anti-interference of the new energy pose a challenge to the stability of the power grid, thereby putting forward higher requirements for the dynamic performance of the synchronous generator. The flexible excitation system taking IGBT (Insulated Gate Bipolar Transistor) as a power unit carrier breaks through the output limitation of the traditional excitation system based on SCR (thyristor) that the top value voltage is proportional to the terminal voltage of the machine, can effectively improve the strong excitation capability of the synchronous machine under low voltage conditions and the suppression capability of the overvoltage after the fault, and is increasingly widely applied in new power systems.

[0003] In the related art, the simulation model of the excitation system is established based on the conventional thyristor excitation system, and the model structure (such as the IEEE standard model) and the parameter characteristics cannot accurately simulate the core action characteristics of the flexible excitation system, especially the decoupling characteristics of the top value voltage and the terminal voltage of the machine and the rapid overcurrent limiting characteristics. This leads to the inability to correctly evaluate the positive effect of the flexible excitation device on the stability of the system in the grid simulation calculation, thereby increasing the risk of grid operation and the construction investment. SUMMARY

[0004] Therefore, the present application discloses a simulation method, device, equipment and storage medium of a flexible excitation device, which can solve the problems in the related art.

[0005] To achieve the above-mentioned purpose, the technical solutions of the present application are as follows: According to a first aspect of the present application, a simulation method of a flexible excitation device is provided, and the method comprises: A flexible excitation simulation model for simulating the operation process of the flexible excitation device is constructed, the flexible excitation simulation model at least comprises a voltage transmission and load compensation unit, a series correction unit, a voltage regulation and amplification unit, a limiting amplitude unit connected in series, and a parallel correction unit connected in parallel with the voltage regulation and amplification unit; wherein the input of the flexible excitation simulation model is the terminal voltage and the terminal current; In the voltage regulator limiting amplitude module of the limiting amplitude unit, the output upper limit and lower limit of the voltage regulator contained in the limiting amplitude unit are adjusted according to the comparison result of the terminal voltage and the preset inflection point voltage, so as to simulate the strong excitation capability of the flexible excitation device under low voltage conditions and the top value voltage decoupling characteristics under overvoltage conditions; In the excitation current over-limit limiting module of the limiting unit, an excitation current over-limit limiting value is calculated according to the terminal voltage and the excitation current to simulate the over-current limiting function of the power device in the flexible excitation device.

[0006] As a preferred solution, the adjustment of the upper and lower limits of the output of the voltage regulator included in the limiting unit according to the comparison result of the terminal voltage and the preset inflection point voltage comprises: determining a gain coefficient corresponding to the preset inflection point voltage; when the terminal voltage is not higher than the inflection point voltage, determining the product of the maximum output of the voltage regulator and the gain coefficient as the upper limit of the limiting of the voltage regulator, and determining the product of the minimum output of the voltage regulator and the gain coefficient as the lower limit of the limiting of the voltage regulator; when the terminal voltage is higher than the inflection point voltage, the upper and lower limits of the limiting of the voltage regulator remain the maximum output and the minimum output of the voltage regulator respectively.

[0007] As a preferred solution, the calculation of the excitation current over-limit limiting value according to the terminal voltage and the excitation current comprises: determining an excitation current and an excitation current over-limit limiting coefficient; determining the excitation current over-limit limiting value by calculating the ratio of the product of the terminal voltage and the excitation current over-limit limiting coefficient to the excitation current, and constraining the output of the voltage regulating amplification unit by the excitation current over-limit limiting value.

[0008] As a preferred solution, the execution process of the voltage transmission and load compensation unit comprises: calculating an internal output voltage according to the terminal voltage vector of the generator, the terminal current vector, and the regulating resistance and the regulating reactance; processing the internal output voltage through a first-order inertia measurement link, and outputting a measurement voltage value to the series correction unit.

[0009] As a preferred solution, the series correction unit is implemented by using a series PID controller or a parallel PID controller; when the series PID controller is used, its transfer function includes regulator gain, proportional integral selection factor, and multiple voltage regulator time constants, and is limited by the maximum / minimum internal voltage of the regulator; when the parallel PID controller is used, its output is the sum of the proportional, integral, and differential channel outputs; wherein the integral channel output is limited by the upper / lower limit of the integral, and the differential channel output is limited by the upper / lower limit of the differential.

[0010] As a preferred solution, the method further comprises: In the solving step of the differential equations of each unit in the flexible excitation simulation model, the trapezoidal integral method is used to discretize and solve the differential equations describing the dynamic characteristics of each unit.

[0011] As a preferred solution, the method for obtaining the operating parameters of each unit in the flexible excitation simulation model comprises field measurement and system identification, which comprises: putting the excitation regulator of the flexible excitation device in a static working state; applying a series of step voltage disturbance signals with different amplitudes to the input end of the excitation regulator; synchronously measuring and recording the output response of each unit in the flexible excitation simulation model under the step voltage disturbance; analyzing and checking the measurement data by combining the sub-section identification and overall verification: for the linear dynamic section in the model, the frequency domain measurement method or the time domain measurement method is used for parameter identification; for the nonlinear section in the model, based on the test curve recorded in the output response, the least square method is used for parameter fitting to determine the operating parameters of each limiting module in the limiting unit.

[0012] According to the second aspect of the present application, a simulation device of a flexible excitation device is provided, which comprises: a construction unit: constructing a flexible excitation simulation model for simulating the operation process of a flexible excitation device, the flexible excitation simulation model at least comprising a voltage transmission and load compensation unit, a series correction unit, a voltage regulation and amplification unit, a limiting unit and a parallel correction unit connected in series, and the input of the flexible excitation simulation model is the terminal voltage and the terminal current; an adjusting unit: in the voltage regulator limiting module of the limiting unit, the upper and lower limits of the output of the voltage regulator contained in the limiting unit are adjusted according to the comparison result of the terminal voltage and the preset inflection point voltage, so as to simulate the strong excitation ability of the flexible excitation device under low voltage working condition and the peak voltage decoupling characteristics under overvoltage working condition; a first calculation unit: in the field current limiting module of the limiting unit, the field current limiting value is calculated according to the terminal voltage and the field current, so as to simulate the overcurrent limiting function of the power device in the flexible excitation device.

[0013] As a preferred solution, the adjusting unit is specifically used for: determining the gain coefficient corresponding to the preset inflection point voltage; determining the product of the maximum output of the voltage regulator and the gain coefficient as the upper limit of the voltage regulator, and determining the product of the minimum output of the voltage regulator and the gain coefficient as the lower limit of the voltage regulator when the terminal voltage is not higher than the inflection point voltage; when the terminal voltage is higher than the inflection point voltage, the upper limit and the lower limit of the voltage regulator remain the maximum output and the minimum output of the voltage regulator respectively.

[0014] As a preferred solution, the first calculation unit is specifically configured to: determine the excitation current and the excitation current over-limit limiting coefficient; determine the excitation current over-limit limiting value by calculating the ratio of the product of the terminal voltage and the excitation current over-limit limiting coefficient and the excitation current, and constrain the output of the voltage regulating amplification unit by the excitation current over-limit limiting value.

[0015] As a preferred solution, the execution process of the voltage transmission and load compensation unit includes: a second calculation unit: calculating the internal output voltage according to the generator terminal voltage vector, the terminal current vector, and the regulating resistance and reactance; a processing unit: processing the internal output voltage through a first-order inertia measurement link, and outputting a measurement voltage value to the series correction unit.

[0016] As a preferred solution, the series correction unit is implemented by a series PID controller or a parallel PID controller; when the series PID controller is adopted, its transfer function includes the regulator gain, the proportional integral selection factor, and a plurality of voltage regulator time constants, and is limited by the maximum / minimum internal voltage of the regulator; when the parallel PID controller is adopted, its output is the sum of the proportional, integral, and differential channel outputs; wherein the integral channel output is limited by the upper / lower limit of the integral, and the differential channel output is limited by the upper / lower limit of the differential.

[0017] As a preferred solution, the device further includes: a solving unit: in the solving step of the differential equation of each unit in the flexible excitation simulation model, the trapezoidal integration method is used to discretely solve the differential equation describing the dynamic characteristics of each unit.

[0018] As a preferred solution, the method for obtaining the operating parameters of each unit in the flexible excitation simulation model includes field measurement and system identification, including: making the excitation regulator of the flexible excitation device in a static working state; applying a series of step voltage disturbance signals with different amplitudes to the input end of the excitation regulator; synchronously measuring and recording output responses of each unit in the flexible excitation simulation model under the step voltage disturbance; The measured data is analyzed and checked by combining sub-section identification with overall verification: For a linear dynamic section in the model, a frequency domain measurement method or a time domain measurement method is used for parameter identification; For a nonlinear section in the model, based on the test curve recorded in the output response, a least square method is used for parameter fitting to determine the operation parameters of each limiting module in the limiting unit.

[0019] According to a third aspect of the present application, an electronic device is provided, comprising: a processor; a memory for storing processor executable instructions; The processor implements the steps of the method according to the first aspect by executing the executable instructions.

[0020] According to a fourth aspect of the present application, a computer readable storage medium is provided, which stores computer instructions, and the instructions are executed by a processor to implement the steps of the method according to the first aspect.

[0021] As can be seen from the above technical solutions, the simulation method of the flexible excitation device disclosed by the present application has the following advantages: On the one hand, the action characteristics of the flexible excitation device in the electromechanical transient and medium-long term dynamic process can be accurately simulated, especially the dynamic characteristics of the peak voltage, which effectively improves the reliability of the simulation and provides protection for the construction of a new type of power system mainly composed of new energy; on the other hand, the strong excitation capability of the excitation voltage of the flexible excitation device under low voltage working condition and the decoupling characteristics of the excitation voltage and the terminal voltage under the condition that the terminal voltage is higher than the inflection point voltage can be correctly reflected; the comparison of the terminal voltage also shows that the terminal voltage simulated by the method can output higher voltage under the strong excitation of the excitation device under low voltage working condition, and the overvoltage suppression capability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a flowchart of a simulation method of a flexible excitation device provided by an example embodiment; Figure 2 is an architecture diagram of a simulation system of a flexible excitation device provided by an example embodiment; Figure 3 is a block diagram of a voltage transmission and load compensation unit provided by an example embodiment; Figure 4 is a block diagram of a series PID provided by an example embodiment; Figure 5is a parallel PID block diagram provided by an example embodiment; Figure 6 is a voltage regulating amplification unit block diagram provided by an example embodiment; Figure 7 is a parallel correction unit block diagram provided by an example embodiment; Figure 8 is a low excitation limiting amplifier block diagram provided by an example embodiment; Figure 9 is a high excitation limiting amplifier block diagram provided by an example embodiment; Figure 10 is a schematic structural diagram of a device provided by an example embodiment; Figure 11 is a block diagram of a simulation device of a flexible excitation device provided by an example embodiment. DETAILED DESCRIPTION

[0023] The example embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to designate the same elements, unless otherwise indicated. The embodiments described in the following example embodiments are not meant to represent all embodiments consistent with one or more embodiments of the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of one or more embodiments of the present application as detailed in the appended claims.

[0024] It should be noted that the steps of the methods in other embodiments are not necessarily performed in the order described in the present application. In some other embodiments, the steps of the methods can be more or less than those described in the present application. In addition, a single step described in the present application can be broken down into multiple steps in other embodiments; and multiple steps described in the present application can be combined into a single step in other embodiments.

[0025] To further illustrate the present application, the following examples are provided: Synchronous generators are the cornerstone of stable operation of power systems. With large-scale integration of new energy such as wind power and photovoltaic power, the weak support and anti-interference of the new energy pose a challenge to the stability of the power grid, thereby putting forward higher requirements for the dynamic performance of the synchronous generator. The flexible excitation system with IGBT (Insulated Gate Bipolar Transistor) as the power unit carrier breaks through the output limitation of the traditional SCR-based excitation system, which is proportional to the top value of the voltage and the terminal voltage of the machine, and can effectively improve the strong excitation capability of the synchronous machine under low voltage conditions and the suppression capability of the overvoltage after the fault, and is increasingly widely used in new power systems.

[0026] In the related art, the simulation model of the excitation system is established based on the conventional thyristor excitation system, and the model structure (such as the IEEE standard model) and the parameter characteristics cannot accurately simulate the core action characteristics of the flexible excitation system, especially the decoupling characteristics of the top voltage and the terminal voltage and the rapid overcurrent limiting characteristics. This leads to the inability to correctly evaluate the positive effect of the flexible excitation device on the system stability in the power grid simulation calculation, and increases the risk of power grid operation and construction investment.

[0027] To solve the problems in the related art, the present application provides a simulation method of a flexible excitation device.

[0028] Figure 1 A flowchart of a simulation method of a flexible excitation device provided by an exemplary embodiment is shown in FIG. 1. Figure 1 As shown in the figure, the method can include the following steps: Step 101, a flexible excitation simulation model for simulating the operation process of the flexible excitation device is constructed, the flexible excitation simulation model at least includes a voltage transmission and load compensation unit, a series correction unit, a voltage regulation and amplification unit, an amplitude limiting unit, and a parallel correction unit connected in series, wherein the input of the flexible excitation simulation model is the terminal voltage and the terminal current.

[0029] Step 102, in the voltage regulator amplitude limiting module of the amplitude limiting unit, the upper and lower limits of the output of the voltage regulator contained in the amplitude limiting unit are adjusted according to the comparison result of the terminal voltage and the preset inflection point voltage, to simulate the strong excitation capability of the flexible excitation device under low voltage working condition and the top voltage decoupling characteristics under overvoltage working condition. Step 103, in the excitation current over-limit amplitude limiting module of the amplitude limiting unit, the excitation current over-limit amplitude limiting value is calculated according to the terminal voltage and the excitation current, to simulate the overcurrent limiting function of the power device in the flexible excitation device.

[0030] In this embodiment, on the one hand, the action characteristics of the flexible excitation device in the electromechanical transient and medium-long term dynamic process can be accurately simulated, especially the dynamic characteristics of the top voltage, effectively improving the reliability of the simulation, and providing protection for the construction of the new power system mainly based on new energy; on the other hand, the strong excitation capability of the excitation voltage of the flexible excitation device under low voltage working condition and the decoupling characteristics of the excitation voltage and the terminal voltage under the condition that the terminal voltage is higher than the inflection point voltage can be correctly reflected; the comparison of the terminal voltage also shows that the simulated terminal voltage under low voltage working condition can output higher voltage under the strong excitation action of the excitation device, and the overvoltage suppression capability is improved.

[0031] Figure 2 An architecture diagram of a simulation system of a flexible excitation device provided by an exemplary embodiment is shown in FIG. 2. Figure 2As shown, the system includes: a voltage transmitter and load compensation unit, a series correction unit, a voltage regulating amplifier unit, a parallel correction unit, and a limiting unit.

[0032] In one embodiment, the execution process of the voltage transmitter and load compensation unit includes: calculating the internal output voltage based on the generator terminal voltage vector, the generator terminal current vector, the droop resistor, and the droop reactance; processing the internal output voltage through a first-order inertial measurement circuit, and outputting the measured voltage value to the series correction unit.

[0033] The voltage transmitter and load compensation unit is used to calculate the compensation voltage based on the generator terminal voltage vector and terminal current vector, and performs delay smoothing processing through a first-order inertial element.

[0034] The compensation voltage can be calculated as follows: ; in, For terminal voltage vector, R is the terminal current vector. C For the differential resistor, X C For differential reactance, This is the internal output of the voltage transmitter and load compensation unit.

[0035] The measurement process uses V C As the input, its delay and smoothing effect can be simulated using a first-order inertial approximation, with typical values ​​of 0.01s or 0.02s. The overall process is as follows: Figure 3 As shown, in Figure 3 In the middle, T R To measure the time constant of the inertial element, S is the integration factor, and V REF V is the excitation reference voltage. ERR This is the output for the deviation.

[0036] The series correction unit is used to perform PID correction on the compensation voltage.

[0037] The series correction unit can correct the compensation voltage output by the voltage transmitter and load compensation unit to improve the stability of the overall control. Specifically, it can be simulated by series PID or parallel PID.

[0038] The block diagram of the series PID control is as follows Figure 4 As shown, Figure 4 In the middle, V S K is the output of the power system stabilizer, and K is the regulator gain. V For proportional-integral or pure-integral adjustment selection factor (when K) V When the value is 0, it switches to parallel PI control. T1, T2, T3, T4 are the voltage regulator time constants, V. PIDO This is the PID output.

[0039] The parallel PID control block diagram is shown in Figure 5 Figure 5 K P is a proportional gain, K I is an integral gain, K D is a differential coefficient, T D is a differential time constant, V INVMAX is an integral upper limit, V INVMIN is an integral lower limit, V DEVMAX is a differential upper limit, V DEVMIN is a differential lower limit.

[0040] The voltage regulating amplification unit is used to extract the alternating component of the voltage regulating amplification output.

[0041] Based on the output control of the series correction unit and the parallel correction unit, a first-order differential amplification is adopted, which is usually a pure proportional link, and in actual engineering, a first-order inertia link can be added to improve the control stability, and the control block diagram is shown in Figure 6 Figure 6 V F is the output of the parallel correction unit, K A is a voltage regulator gain, T A is a voltage regulator amplifier time constant, V AMAX is a voltage regulator internal output upper limit, V AMIN is a voltage regulator internal output lower limit.

[0042] The parallel correction unit is used to feed back the field voltage according to the direct-current blocking link.

[0043] In an embodiment, the series correction unit is implemented by using a series PID controller or a parallel PID controller; when the series PID controller is used, its transfer function includes a regulator gain, a proportional integral selection factor, and a plurality of voltage regulator time constants, and is limited by the maximum / minimum internal voltage of the regulator; when the parallel PID controller is used, its output is the sum of the outputs of the proportional, integral, and differential channels; wherein the integral channel output is limited by the integral upper / lower limit, and the differential channel output is limited by the differential upper / lower limit.

[0044] The parallel correction unit takes the output of the voltage regulating amplification unit as input and takes the alternating component as feedback to improve the control stability, which is usually simulated by a direct-current blocking link, and the control block diagram is shown in Figure 7 Figure 7 K F is a parallel correction loop gain, T F is a parallel correction loop time constant.

[0045] ​​​The limiting unit is used for limiting the output of the feedback excitation voltage, and the limiting includes low excitation limiting, over excitation limiting, voltage regulator limiting and excitation current over-limiting limiting.

[0046] When the whole process simulation is adopted, the medium and long term dynamic characteristics of the generator must be considered, and the low excitation and over excitation control must be considered, so the limiting unit includes four parts: low excitation limiting, over excitation limiting, excitation current over-limiting limiting and voltage regulator limiting.

[0047] The low excitation limiting control block diagram is shown in Figure 8 , Figure 8 wherein, P is the active power output of the generator, Q is the reactive power output of the generator, K H1 is the low excitation limiting loop gain, T H1 and T H2 are the low excitation limiting loop time constants, and V H is the low excitation limiting output.

[0048] The over excitation limiting control block diagram is shown in Figure 9 , Figure 9 wherein, B is the over excitation heat allowed value, T L1 and T L2 are the low excitation limiting loop time constants, V L is the over excitation limiting output, and I FDN is the long-term allowed current of the generator magnetic field.

[0049] The voltage regulator limiting: the flexible excitation uses the self-excitation boost capability of the voltage source converter to break through the output limitation that the top value voltage of the thyristor excitation system is proportional to the terminal voltage.

[0050] In an embodiment, the adjusting the upper limit and the lower limit of the output of the voltage regulator included in the limiting unit according to the comparison result of the terminal voltage and the preset inflection point voltage comprises: determining a gain coefficient corresponding to the preset inflection point voltage; when the terminal voltage is not higher than the inflection point voltage, determining the product of the maximum output of the voltage regulator and the gain coefficient as the upper limit of the limiting of the voltage regulator, and determining the product of the minimum output of the voltage regulator and the gain coefficient as the lower limit of the limiting of the voltage regulator; when the terminal voltage is higher than the inflection point voltage, the upper limit and the lower limit of the limiting of the voltage regulator remain the maximum output and the minimum output of the voltage regulator respectively.

[0051] When the terminal voltage is lower than the set value, the generator has better over excitation capability; when the terminal voltage is higher than the set value, the top value voltage remains unchanged, and the simulation is performed by using the following formula: ; wherein, K FLEX is the gain corresponding to the inflection point voltage of the flexible excitation, V RMAX is the maximum output value of the voltage regulator, and VRMIN Vmin is the minimum output value of the voltage regulator KEEN E is the preset inflection voltage FDLH E is the upper limit of the voltage regulator amplitude limiting FDLL E is the lower limit of the voltage regulator amplitude limiting

[0052] Field current over-limit limiting: when the field current over-limits, directly change the output limiting, ensure the IGBT not to over-flow.

[0053] In an embodiment, the calculating the field current over-limit limiting value according to the machine terminal voltage and the field current comprises: determining a field current and a field current over-limit limiting coefficient; determining the field current over-limit limiting value by calculating the ratio of the product of the machine terminal voltage and the field current over-limit limiting coefficient and the field current, and restricting the output of the voltage regulating amplification unit by the field current over-limit limiting value.

[0054] The limiting value is proportional to the machine terminal voltage and inversely proportional to the field current, and is simulated by the following formula.

[0055] ; E = K * I FDL K is the field current over-limit limiting value LIMIT I is the field current over-limit limiting coefficient FD I is the field current

[0056] The output of the voltage regulating amplification unit is respectively compared with: (1) low excitation limiting amplitude, taking the larger one; (2) over-excitation limiting amplitude, taking the smaller one; (3) over-limiting voltage regulating amplifier output limiting EFDLH, EFDLL; (4) over-limiting field current over-limit limiting value.

[0057] In an embodiment, the method further comprises: in the solving step of each unit differential equation in the flexible field simulation model, using the trapezoidal integral method to discretize and solve the differential equation describing the dynamic characteristics of each unit.

[0058] In an embodiment, the method for obtaining the operation parameters of each unit in the flexible excitation simulation model comprises field measurement and system identification, including: making the excitation regulator of the flexible excitation device in a static working state; applying a series of step voltage disturbance signals with different amplitudes at the input end of the excitation regulator; synchronously measuring and recording the output response of each unit in the flexible excitation simulation model under the step voltage disturbance; and analyzing and checking the measurement data in a manner combining sub-loop identification and overall verification: for the linear dynamic loop in the model, the parameter identification is performed by using the frequency domain measurement method or the time domain measurement method; and for the nonlinear loop in the model, the least square method is used for parameter fitting based on the test curve recorded in the output response to determine the operation parameters of each limiting module in the limiting unit.

[0059] Figure 10 is a schematic structural diagram of a device provided by an example embodiment. Please refer to Figure 10 At the hardware level, the device comprises a processor 1002, an internal bus 1004, a network interface 1006, a memory 1008, and a non-volatile memory 1010, and of course, other hardware required by functions. One or more embodiments of the present application can be implemented in a software manner, such as reading a corresponding computer program from the non-volatile memory 1010 into the memory 1008 by the processor 1002 and then running. Of course, in addition to the software implementation, one or more embodiments of the present application do not exclude other implementation manners, such as logic devices or a combination of software and hardware, etc., that is, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or a logic device.

[0060] Please refer to Figure 11 A simulation device of a flexible excitation device can be applied to a device as shown in Figure 11 to implement the technical solutions of the present application, and the device comprises: A construction unit 1101 is configured to construct a flexible excitation simulation model for simulating the operation process of a flexible excitation device, wherein the flexible excitation simulation model at least comprises a voltage transmission and load compensation unit, a series correction unit, a voltage amplification unit, a limiting unit, and a parallel correction unit connected in parallel with the voltage amplification unit connected in series; and the input of the flexible excitation simulation model is a terminal voltage and a terminal current. An adjustment unit 1102 is configured to adjust the upper limit and the lower limit of the output of the voltage regulator included in the limiting unit according to the comparison result of the terminal voltage and a preset inflection point voltage in the voltage regulator limiting module of the limiting unit, so as to simulate the strong excitation capability of the flexible excitation device under low voltage working conditions and the peak voltage decoupling characteristics of the flexible excitation device under overvoltage working conditions. The first calculation unit 1103 is configured to calculate an over-current limiting value of the excitation current in the over-current limiting module of the limiting unit according to the terminal voltage and the excitation current, so as to simulate the over-current limiting function of the power device in the flexible excitation device. Optionally, the adjusting unit 1102 is specifically configured to: determine a gain coefficient corresponding to the preset inflection point voltage; when the terminal voltage is not higher than the inflection point voltage, determine the product of the maximum output of the voltage regulator and the gain coefficient as the upper limit of the limiting of the voltage regulator, and determine the product of the minimum output of the voltage regulator and the gain coefficient as the lower limit of the limiting of the voltage regulator; when the terminal voltage is higher than the inflection point voltage, the upper limit and the lower limit of the limiting of the voltage regulator remain the maximum output and the minimum output of the voltage regulator respectively.

[0061] Optionally, the first calculation unit 1103 is specifically configured to: determine the excitation current and an over-current limiting coefficient of the excitation current; determine the over-current limiting value of the excitation current by calculating the ratio of the product of the terminal voltage and the over-current limiting coefficient of the excitation current to the excitation current, and constrain the output of the voltage regulating amplification unit by the over-current limiting value of the excitation current.

[0062] Optionally, the execution process of the voltage transmission and load compensation unit includes: The second calculation unit 1104 is configured to calculate an internal output voltage according to the terminal voltage vector of the generator, the terminal current vector, and the regulating resistance and the regulating reactance; The processing unit 1105 is configured to process the internal output voltage through a first-order inertia measurement link, and output a measurement voltage value to the series correction unit.

[0063] Optionally, the series correction unit is implemented by using a series PID controller or a parallel PID controller; when the series PID controller is used, the transfer function thereof includes a regulator gain, a proportional integral selection factor, and a plurality of voltage regulator time constants, and is limited by the maximum / minimum internal voltage of the regulator; when the parallel PID controller is used, the output thereof is the sum of the proportional, integral, and differential channel outputs; wherein, the integral channel output is limited by the upper / lower limit of the integral, and the differential channel output is limited by the upper / lower limit of the differential.

[0064] Optionally, the device further includes: The solving unit 1106 is configured to discretely solve the differential equation describing the dynamic characteristics of each unit in the flexible excitation simulation model by using the trapezoidal integral method in the solving step of the differential equation of each unit in the flexible excitation simulation model.

[0065] Optionally, the method for obtaining the operating parameters of each unit in the flexible excitation simulation model comprises field measurement and system identification, and includes the following steps. The excitation regulator of the flexible excitation device is in a static working state. A series of step voltage disturbance signals with different amplitudes are applied to the input end of the excitation regulator. The output responses of each unit in the flexible excitation simulation model under the step voltage disturbance are synchronously measured and recorded. The measured data are analyzed and checked by using a combination of sub-section identification and overall verification. For the linear dynamic section in the model, the frequency domain measurement method or the time domain measurement method is used for parameter identification. For the nonlinear section in the model, the least square method is used for parameter fitting based on the test curve recorded in the output response to determine the operating parameters of each limiting module in the limiting unit.

[0066] The system, device, module or unit illustrated in the above embodiments can be specifically implemented by a computer chip or entity, or by a product with certain functions. A typical implementation device is a computer, and the specific form of the computer can be a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email transceiver device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0067] In a typical configuration, a computer includes one or more processors (CPU), input / output interface, network interface, and memory.

[0068] The memory can include a non-persistent memory in a computer readable medium, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer readable medium.

[0069] Computer-readable media includes permanent and non-permanent, movable and non-movable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, disk storage, quantum memory, graphene-based storage medium or other magnetic storage device, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0070] For the computer-readable medium (or computer-readable storage medium) as described above or any other form, computer instructions can be stored thereon, which are executed by a processor to implement one or more of the above embodiments, thereby realizing the technical solutions of the present application.

[0071] The present application also provides a computer program, which is executed by a processor to implement one or more of the above embodiments, thereby realizing the technical solutions of the present application. The computer program can be specifically recorded on the computer-readable medium as described above or any other form, and the present application does not limit this.

[0072] It should also be noted that the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, product or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, product or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, product or device including the element.

[0073] The above described specific embodiments of the application. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results. Additionally, the processes depicted in the attached figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In certain implementations, multitasking and parallel processing can be advantageous.

[0074] The terminology used in this disclosure of one or more embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of one or more embodiments. As used in this disclosure and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0075] It will be understood that, although the terms first, second, third, etc. can be used herein to describe various information, the information should not be limited to these terms. These terms are used only to distinguish one piece of information from another. For example, a first information could be termed a second information, and, similarly, a second information could be termed a first information without departing from the scope of one or more embodiments. As used herein, the term "if' can be construed to mean "when" or "upon" or "in response to determining" depending on the context.

[0076] The foregoing is considered as illustrative only of the principles of one or more embodiments. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the one or more embodiments to the exact construction and operation described. Accordingly, all such variations are intended to fall within the scope of one or more embodiments.

Claims

1. A simulation method of a flexible excitation device, characterized by, The method comprises: a flexible excitation simulation model for simulating the operation process of a flexible excitation device is constructed, the flexible excitation simulation model at least comprising a voltage transmission and load compensation unit, a series correction unit, a voltage regulating and amplifying unit, a limiting unit and a parallel correction unit connected in series, in parallel with the voltage regulating and amplifying unit; wherein the input of the flexible excitation simulation model is a terminal voltage and a terminal current; in a voltage regulator limiting module of the limiting unit, the upper and lower limits of the output of a voltage regulator contained in the limiting unit are adjusted according to the comparison result of the terminal voltage and a preset inflection point voltage, so as to simulate the strong excitation capability of the flexible excitation device under low voltage working conditions and the peak voltage decoupling characteristics of the flexible excitation device under overvoltage working conditions; in an excitation current over-limit limiting module of the limiting unit, an excitation current over-limit limiting value is calculated according to the terminal voltage and the excitation current, so as to simulate the overcurrent limiting function of a power device in the flexible excitation device.

2. The method of claim 1, wherein, The adjustment of the upper and lower limits of the output of the voltage regulator contained in the limiting unit according to the comparison result of the terminal voltage and the preset inflection point voltage comprises: determining a gain coefficient corresponding to the preset inflection point voltage; when the terminal voltage is not higher than the inflection point voltage, the product of the maximum output of the voltage regulator and the gain coefficient is determined as the upper limit of the limiting of the voltage regulator, and the product of the minimum output of the voltage regulator and the gain coefficient is determined as the lower limit of the limiting of the voltage regulator; when the terminal voltage is higher than the inflection point voltage, the upper and lower limits of the limiting of the voltage regulator remain the maximum output and the minimum output of the voltage regulator respectively.

3. The method of claim 1, wherein, The calculation of the excitation current over-limit limiting value according to the terminal voltage and the excitation current comprises: determining an excitation current and an excitation current over-limit limiting coefficient; the excitation current over-limit limiting value is determined by calculating the ratio of the product of the terminal voltage and the excitation current over-limit limiting coefficient and the excitation current, and the output of the voltage regulating and amplifying unit is constrained by the excitation current over-limit limiting value.

4. The method of claim 1, wherein, The execution process of the voltage transmission and load compensation unit comprises: calculating an internal output voltage according to a generator terminal voltage vector, a terminal current vector and a regulating resistance and a regulating reactance; processing the internal output voltage through a first-order inertia measurement link, and outputting a measurement voltage value to the series correction unit.

5. The method of claim 1, wherein, The series correction unit is implemented by using a series PID controller or a parallel PID controller; when the series PID controller is used, its transfer function contains a regulator gain, a proportional integral selection factor and a plurality of voltage regulator time constants, and is limited by a regulator maximum / minimum internal voltage; when the parallel PID controller is used, its output is the sum of the proportional, integral and differential channel outputs; wherein the integral channel output is limited by an integral upper / lower limit, and the differential channel output is limited by a differential upper / lower limit.

6. The method of claim 1, wherein, The method further comprises: in the solving step of the differential equations of each unit in the flexible excitation simulation model, the differential equations describing the dynamic characteristics of each unit are discretely solved by using the trapezoidal integration method.

7. The method of claim 1, wherein, The method for obtaining the operation parameters of each unit in the flexible excitation simulation model comprises field measurement and system identification, and includes: putting the excitation regulator of the flexible excitation device in a static working state; applying a series of step voltage disturbance signals with different amplitudes to the input end of the excitation regulator; synchronously measuring and recording the output responses of each unit in the flexible excitation simulation model under the step voltage disturbance; analyzing and checking the measurement data by combining the sub-section identification with the overall verification: for the linear dynamic section in the model, the frequency domain measurement method or the time domain measurement method is used for parameter identification; for the nonlinear section in the model, based on the test curve recorded in the output response, the least square method is used for parameter fitting to determine the operation parameters of each limiting module in the limiting unit.

8. An emulation device of a flexible excitation device, characterized by The device comprises: a construction unit: constructing a flexible excitation simulation model for simulating the operation process of a flexible excitation device, the flexible excitation simulation model at least comprising a voltage transmission and load compensation unit, a series correction unit, a voltage regulation and amplification unit, a limiting unit connected in series, and a parallel correction unit connected in parallel with the voltage regulation and amplification unit; wherein the input of the flexible excitation simulation model is the terminal voltage and the terminal current; an adjustment unit: in the voltage regulator limiting module of the limiting unit, the upper limit and the lower limit of the output of the voltage regulator contained in the limiting unit are adjusted according to the comparison result of the terminal voltage and the preset inflection point voltage, so as to simulate the strong excitation ability of the flexible excitation device under low voltage working condition and the top value voltage decoupling characteristics under overvoltage working condition; a first calculation unit: in the field current over-limit limiting module of the limiting unit, the field current over-limit limiting value is calculated according to the terminal voltage and the field current, so as to simulate the overcurrent limiting function of the power device in the flexible excitation device.

9. An electronic device, comprising: It comprises: a processor; a memory for storing processor executable instructions; wherein the processor executes the executable instructions to implement the steps of the method of any one of claims 1-7.

10. A computer readable storage medium having stored thereon computer instructions, wherein, The instructions are executed by the processor to implement the steps of the method of any one of claims 1-7.

Images