CN117559465A - New energy transient state active disturbance rejection voltage supporting method considering line power transmission capability - Google Patents

New energy transient state active disturbance rejection voltage supporting method considering line power transmission capability Download PDF

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Publication number
CN117559465A
CN117559465A CN202311577966.7A CN202311577966A CN117559465A CN 117559465 A CN117559465 A CN 117559465A CN 202311577966 A CN202311577966 A CN 202311577966A CN 117559465 A CN117559465 A CN 117559465A
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grid
voltage
axis current
reference value
new energy
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Inventor
陶翔
徐在德
王凯
辛建波
张帅
陈波
孙之栋
叶钟海
周求宽
刘一欣
周宁
程思萌
汪硕承
郝钰
刘柳
周煦光
戈田平
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Tianjin University
State Grid Corp of China SGCC
Shandong University
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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Tianjin University
State Grid Corp of China SGCC
Shandong University
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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Priority to CN202311577966.7A priority Critical patent/CN117559465A/en
Publication of CN117559465A publication Critical patent/CN117559465A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a new energy transient state active disturbance rejection voltage supporting method considering line power transmission capacity, which comprises the following steps: constructing a new energy grid-connected link control loop for fault voltage support; the grid-connected voltage of the new energy grid-connected point is differenced from a grid-connected voltage reference value, the difference value is input into a grid-connected voltage closed loop, and a q-axis current first part reference value is output; generating a q-axis current second part reference value according to the power feedforward branch; calculating a final q-axis current reference value from the q-axis current first portion reference value and the q-axis current second portion reference value, and electrically connecting the q-axisStream reference value I qr And controlling the current controller command value of the grid-connected system under the serious fault of the power grid to obtain the PWM modulation voltage. And the grid-connected voltage is accurately regulated by utilizing a grid-connected voltage closed loop and a PI controller, so that the grid-connected voltage is quickly and accurately stably supported.

Description

New energy transient state active disturbance rejection voltage supporting method considering line power transmission capability
Technical Field
The invention belongs to the technical field of new energy grid-connected stable control, and particularly relates to a new energy transient active disturbance rejection voltage supporting method considering line power transmission capacity.
Background
At present, wind and light new energy gradually replaces the traditional synchronous generator to become dominant power generation energy. Therefore, the new energy source must bear the responsibility and obligation of the traditional synchronous generator to maintain the stability of the power grid. In the power grid fault state, the new energy source is required to provide reactive voltage support for the power grid so as to improve the voltage stabilizing capability of the power grid and avoid accidents such as cascading faults.
For reactive voltage support, early voltage control was implemented using a capacitor-reactor set. But the response speed is relatively slow, and the voltage cannot be rapidly supported. And then adopting the schemes of new energy-capacitor bank-on-load voltage regulating transformer combined regulation and control, new energy-STATCOM combined regulation and control and the like. The related control is divided into two parts, one part is responsible for optimizing reactive power output of different units, and the other part is responsible for rapidly regulating the reactive power output. For the latter, a method of constructing a voltage closed loop and controlling by using a PI controller is often adopted in the past. The method has stronger robustness, but cannot realize self-adaptive control on the line voltage circuit, and the control speed needs to be further improved.
Disclosure of Invention
The invention provides a new energy transient state active disturbance rejection voltage supporting method considering line power transmission capacity, which is used for solving the technical problem that self-adaptive control cannot be realized on a line voltage circuit.
In a first aspect, the present invention provides a new energy transient active disturbance rejection voltage supporting method considering line power transmission capability, including:
constructing a new energy reactive voltage control model considering the power transmission capability of a line, and regulating and controlling the grid-connected voltage of a new energy grid-connected point according to the new energy reactive voltage control model;
constructing a new energy grid-connected link control loop for fault voltage support, wherein the new energy grid-connected link control loop comprises a grid-connected voltage closed loop based on a PI controller structure and a power feedforward branch based on a latch structure;
grid-connected voltage V of new energy grid-connected point PCC And grid-connected voltage reference valueTaking the difference, inputting the difference value into the grid-connected voltage closed loop, and outputting a first partial reference value I of q-axis current qr1 Wherein the q-axis current first part reference value I is calculated qr1 The expression of (2) is:
wherein k is p Is proportional coefficient, k of PI controller i Integrating the coefficient for the PI controller, and s is the Laplacian;
generating a q-axis current second part reference value I according to the power feedforward branch qr2 Wherein the q-axis current second part reference value I is calculated qr2 The expression of (2) is:
in the method, in the process of the invention,for t=t after failure 0 Time +DeltatGrid-connected voltage of>For t=t after failure 0 Q-axis current at +Δt +.>For pre-fault t=t 0 Grid-connected voltage at time, ">For pre-fault t=t 0 Q-axis current at time;
according to the q-axis current first part reference value I qr1 And the q-axis current second part reference value I qr2 Calculating the final q-axis current reference value I qr And the q-axis current reference value I qr And controlling the current controller command value of the grid-connected system under the serious fault of the power grid to obtain the PWM modulation voltage.
In a second aspect, the present invention provides a new energy transient active disturbance rejection voltage support system accounting for line power transfer capability, comprising:
the first construction module is configured to construct a new energy reactive voltage control model considering the power transmission capacity of the line, and regulate and control the grid-connected voltage of a new energy grid-connected point according to the new energy reactive voltage control model;
the second construction module is configured to construct a new energy grid-connected link control loop for fault voltage support, wherein the new energy grid-connected link control loop comprises a grid-connected voltage closed loop constructed based on a PI controller and a power feedforward branch constructed based on a latch;
an output module configured to output a grid-connected voltage V of the new energy grid-connected point PCC And grid-connected voltage reference valueTaking the difference, inputting the difference value into the grid-connected voltage closed loop, and outputting a first partial reference value I of q-axis current qr1 Wherein the q-axis current first portion is calculatedDivide reference value I qr1 The expression of (2) is:
wherein k is p Is proportional coefficient, k of PI controller i Integrating the coefficient for the PI controller, and s is the Laplacian;
a generation module configured to generate a q-axis current second part reference value I according to the power feedforward branch qr2 Wherein the q-axis current second part reference value I is calculated qr2 The expression of (2) is:
in the method, in the process of the invention,for t=t after failure 0 Grid-connected voltage at +Deltat, +.>For t=t after failure 0 Q-axis current at +Δt +.>For pre-fault t=t 0 Grid-connected voltage at time, ">For pre-fault t=t 0 Q-axis current at time;
a control module configured to control the first partial reference value I according to the q-axis current qr1 And the q-axis current second part reference value I qr2 Calculating the final q-axis current reference value I qr And the q-axis current reference value I qr And controlling the current controller command value of the grid-connected system under the serious fault of the power grid to obtain the PWM modulation voltage.
In a third aspect, there is provided an electronic device, comprising: the system comprises at least one processor and a memory communicatively connected with the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the new energy transient active disturbance rejection voltage support method accounting for line power transfer capability of any of the embodiments of the present invention.
In a fourth aspect, the present invention also provides a computer readable storage medium having stored thereon a computer program, the program instructions, when executed by a processor, cause the processor to perform the steps of the new energy transient active disturbance rejection voltage support method according to any of the embodiments of the present invention, taking into account line power transfer capabilities.
According to the new energy transient state active disturbance rejection voltage supporting method considering the line power transmission capability, when a reactive voltage supporting control technology is implemented, the influence of a line power transmission model is considered, the influence of faults on grid-connected point voltage is quickly restrained by utilizing a latch to construct a power feedforward branch, grid-connected voltage closed loop and a PI controller are utilized to accurately adjust the grid-connected point voltage, and finally the grid-connected voltage is quickly and accurately stably supported.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a new energy transient auto-disturbance-rejection voltage supporting method according to an embodiment of the invention, which takes into account the power transmission capability of a line;
FIG. 2 is a graph showing phasor relationships of a transient reactive voltage support system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a new energy transient active disturbance rejection voltage support technique that accounts for line power transfer capabilities according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing voltage drop before implementing the method according to an embodiment of the present invention;
FIG. 5 is a diagram showing the voltage supporting effect after implementing the method according to an embodiment of the present invention;
FIG. 6 is a block diagram of a system for supporting a transient active disturbance rejection voltage of a new energy source, which accounts for the power transmission capability of a line, according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flow chart of a new energy transient active disturbance rejection voltage supporting method considering line power transmission capability is shown.
As shown in fig. 1, the new energy transient active disturbance rejection voltage supporting method considering the line power transmission capability specifically includes the following steps:
step S101, a new energy reactive voltage control model considering the power transmission capacity of a line is constructed, and grid-connected voltage of a new energy grid-connected point is regulated and controlled according to the new energy reactive voltage control model.
In the step, a reactive voltage grid-connected model considering the transmission capacity of line power is constructed by considering new energy grid-connected current, line impedance, grid-connected point voltage, system equivalent voltage and the like, and the expression of the reactive voltage grid-connected model is as follows:
wherein V is PCC Grid-connected voltage of new energy grid-connected point, V g Is equivalent to the system voltage, I d Controlling d-axis current component and X for new energy under dq coordinate system g The equivalent reactance of the system;
according to the physical relationship between the system voltage and current before and after the fault, as shown in fig. 2, a reactive current control branch is introduced into a grid-connected model, and the current I is expected to pass through a q-axis q And 3, adjusting to realize effective support of the power grid voltage. The new energy reactive voltage control model becomes:
wherein V is PCC Grid-connected voltage of new energy grid-connected point, V g Is equivalent to the system voltage, I d Controlling d-axis current component and X for new energy under dq coordinate system g For equivalent reactance of the system, I q And controlling the q-axis current component for the new energy source under the dq coordinate system.
Step S102, a new energy grid-connected link control loop for fault voltage support is constructed, wherein the new energy grid-connected link control loop comprises a grid-connected voltage closed loop based on a PI controller structure and a power feedforward branch based on a latch structure.
In practical application, a new energy grid-connected link control loop for fault voltage support shown in fig. 3 is constructed. Wherein,v is the grid-connected voltage reference value of new energy grid-connected point PCC Grid-connected voltage for new energy grid-connected point, K pi Is the proportional coefficient, K of the current loop PI controller ii Integrating coefficient, K for current loop PI controller PWM The PWM coefficient is R, the internal resistance of the filter is R, the inductance of the filter is L, and the sampling interval is T.
Step S103, the grid-connected voltage V of the new energy grid-connected point is obtained PCC With grid-tied voltage referenceValue ofTaking the difference, inputting the difference value into the grid-connected voltage closed loop, and outputting a first partial reference value I of q-axis current qr1 。
In this step, a q-axis current first portion reference value I is calculated qr1 The expression of (2) is:
wherein k is p Is proportional coefficient, k of PI controller i The integral coefficient is used for the PI controller, and s is used for the Laplacian.
Step S104, generating a q-axis current second part reference value I according to the power feedforward branch qr2 。
In practical applications, to increase the control speed, the disturbance effect caused by the fault needs to be considered in the design of the controller.
T=t before failure 0 At moment, according to a system grid-connected model, the physical relationship between grid-connected voltage and q-axis current of the system is as follows:
in the method, in the process of the invention,for pre-fault t=t 0 Grid-connected voltage at time, ">For pre-fault t=t 0 Q-axis current of time, +.>For pre-fault t=t 0 Time-of-day equivalent system voltage;
however, at the first time t=t after the fault 0 +Δt, according to the system grid-connected model, the physical relationship between the grid-connected voltage and the q-axis current of the system satisfies:
in the method, in the process of the invention,for t=t after failure 0 Equivalent system voltage at +Δt +.>For t=t after failure 0 D-axis current at +Δt +.>For t=t after failure 0 Grid-connected voltage at +Deltat, +.>For t=t after failure 0 Q-axis current at +Δt;
due to a drop in system voltage after a fault, i.eBut-> No transient and X g If the voltage is constant, the grid-connected point is out of voltage +.>And will drop as well.
By observing equations (4) and (5), before and after the fault, the disturbance exists mainly in the first term on the right side of the equal sign. Here orderThe D change before and after the fault can be theoretically reflected in the controller, and the q-axis current generated by the D change after the fault can be reflected in the controller qr2 Should be equal to:
in general, in the case of a conventional,is not measurable due to distance problem, X g But also inaccurate estimation. Equation (7) cannot be applied in practice. Therefore, formula (8) is used instead of formula (7).
Calculating a reference value I of a second part of the q-axis current qr2 The expression of (2) is:
in the method, in the process of the invention,for t=t after failure 0 Grid-connected voltage at +Deltat, +.>For t=t after failure 0 Q-axis current at +Δt +.>For pre-fault t=t 0 Grid-connected voltage at time, ">For pre-fault t=t 0 Q-axis current at time.
Step S105, according to the q-axis current first part reference value I qr1 And institute(s)The q-axis current second part reference value I qr2 Calculating the final q-axis current reference value I qγ And the q-axis current reference value I qr And controlling the current controller command value of the grid-connected system under the serious fault of the power grid to obtain the PWM modulation voltage.
In this step, the final q-axis current reference value I is calculated qr The expression of (2) is: i qr ＝I qr1 -I qr2 。
In summary, the method of the application reconstructs a new energy grid-connected model for fault voltage support, and determines to utilize q-axis current to regulate and control grid-connected point voltage; the new energy grid-connected closed-loop control circuit for fault voltage support is designed to comprise two sub-parts, wherein a grid-connected voltage closed loop and a PI controller respectively generate a first part q-axis current regulation component so as to accurately regulate grid-connected point voltage, a latch is utilized to construct a power feedforward branch so as to generate a second part q-axis current regulation component, the influence of faults on the grid-connected point voltage is quickly restrained, and finally, the difference between the two parts is used as a final control instruction to realize quick and accurate stable support on the grid-connected voltage.
In a specific embodiment, the method is responsible for collecting physical quantities such as inverter output current, grid-connected point voltage, current and the like. Calculating d-axis and q-axis direct current components corresponding to the pre-support through coordinate transformation;
calculating a reference value I of a first part of the q-axis current qr1 : first, PCC voltage and reference voltage thereof are differenced and then output to PI controller to regulate I qr1 ；
Calculating a reference value I of a second part of the q-axis current qr2 : this part is first latched by means of a latchAnd->And is in accordance with the real-time measurement +.>And->Line impedance X g Co-computing I qr2 ；
And controlling the d-axis current command value and the q-axis current command value as current controller command values of the grid-connected system under the serious fault of the power grid to obtain PWM modulation voltage.
And obtaining a PWM control signal of the inverter according to the obtained PWM modulation voltage.
Fig. 4 illustrates a grid-tie point voltage drop scenario after a system failure before the present technology is not implemented. FIG. 5 illustrates the grid-tie point voltage change process after implementing the techniques of the present application. It can be clearly seen that after the technology is implemented, the voltage of the grid-connected point is rapidly increased, and a transient process is almost avoided. The supporting effect is effective, and the system stability is ensured.
Referring to fig. 6, a block diagram of a new energy transient active disturbance rejection voltage support system that accounts for line power transfer capabilities of the present application is shown.
As shown in fig. 6, the new energy transient active disturbance rejection voltage support system 200 includes a first construction module 210, a second construction module 220, an output module 230, a generation module 240, and a control module 250.
The first construction module 210 is configured to construct a new energy reactive voltage control model considering the line power transmission capability, and regulate and control the grid-connected voltage of the new energy grid-connected point according to the new energy reactive voltage control model; the second construction module 220 is configured to construct a new energy grid-connected link control loop for fault voltage support, wherein the new energy grid-connected link control loop comprises a grid-connected voltage closed loop constructed based on a PI controller and a power feedforward branch constructed based on a latch; an output module 230 configured to output a grid-connected voltage V of the new energy grid-connected point PCC And grid-connected voltage reference valueTaking the difference, inputting the difference value into the grid-connected voltage closed loop, and outputting a first partial reference value I of q-axis current qr1 Wherein the q-axis is calculatedReference value of first part of current I qr1 The expression of (2) is: />Wherein k is p Is proportional coefficient, k of PI controller i Integrating the coefficient for the PI controller, and s is the Laplacian; a generation module 240 configured to generate a q-axis current second portion reference value I from the power feed-forward branch qr2 Wherein the q-axis current second part reference value I is calculated qr2 The expression of (2) is: />In (1) the->For t=t after failure 0 Grid-connected voltage at +Deltat, +.>For t=t after failure 0 Q-axis current at +Δt +.>For pre-fault t=t 0 Grid-connected voltage at time, ">For pre-fault t=t 0 Q-axis current at time; a control module 250 configured to control the q-axis current according to the first partial reference value I qr1 And the q-axis current second part reference value I qr2 Calculating the final q-axis current reference value I qr And the q-axis current reference value I qr And controlling the current controller command value of the grid-connected system under the serious fault of the power grid to obtain the PWM modulation voltage.
It should be understood that the modules depicted in fig. 6 correspond to the various steps in the method described with reference to fig. 1. Thus, the operations and features described above for the method and the corresponding technical effects are equally applicable to the modules in fig. 6, and are not described here again.
In other embodiments, embodiments of the present invention further provide a computer readable storage medium having stored thereon a computer program, where the program instructions, when executed by a processor, cause the processor to perform the new energy transient active disturbance rejection voltage support method according to any of the method embodiments described above, taking into account line power transfer capabilities;
as one embodiment, the computer-readable storage medium of the present invention stores computer-executable instructions configured to:
constructing a new energy reactive voltage control model considering the power transmission capability of a line, and regulating and controlling the grid-connected voltage of a new energy grid-connected point according to the new energy reactive voltage control model;
constructing a new energy grid-connected link control loop for fault voltage support, wherein the new energy grid-connected link control loop comprises a grid-connected voltage closed loop based on a PI controller structure and a power feedforward branch based on a latch structure;
grid-connected voltage V of new energy grid-connected point PCC And grid-connected voltage reference valueTaking the difference, inputting the difference value into the grid-connected voltage closed loop, and outputting a first partial reference value I of q-axis current qr1 Wherein the q-axis current first part reference value I is calculated qr1 The expression of (2) is:
wherein k is p Is proportional coefficient, k of PI controller i Integrating the coefficient for the PI controller, and s is the Laplacian;
generating a q-axis current second part reference value I according to the power feedforward branch qr2 Wherein the q-axis current second part reference value I is calculated qr2 The expression of (2) is:
in the method, in the process of the invention,for t=t after failure 0 Grid-connected voltage at +Deltat, +.>For t=t after failure 0 Q-axis current at +Δt +.>For pre-fault t=t 0 Grid-connected voltage at time, ">For pre-fault t=t 0 Q-axis current at time;
according to the q-axis current first part reference value I qr1 And the q-axis current second part reference value I qr2 Calculating the final q-axis current reference value I qr And the q-axis current reference value I qr And controlling the current controller command value of the grid-connected system under the serious fault of the power grid to obtain the PWM modulation voltage.
The computer readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the stored data area may store data created from the use of a new energy transient active disturbance rejection voltage support system that accounts for line power transfer capabilities, and the like. In addition, the computer-readable storage medium may include high-speed random access memory, and may also include memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer readable storage medium optionally includes memory remotely located with respect to the processor, which may be connected to the new energy transient active disturbance rejection voltage support system by a network that accounts for line power transfer capabilities. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, as shown in fig. 7, where the device includes: a processor 310 and a memory 320. The electronic device may further include: an input device 330 and an output device 340. The processor 310, memory 320, input device 330, and output device 340 may be connected by a bus or other means, for example in fig. 7. Memory 320 is the computer-readable storage medium described above. The processor 310 executes various functional applications and data processing of the server by running non-volatile software programs, instructions and modules stored in the memory 320, i.e. implementing the new energy transient active disturbance rejection voltage support method described above in connection with the method embodiments described above with respect to line power transfer capabilities. The input device 330 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the new energy transient active disturbance rejection voltage support system that account for line power transfer capabilities. The output device 340 may include a display device such as a display screen.
The electronic equipment can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the methods provided in the embodiments of the present invention.
As an embodiment, the electronic device is applied to a new energy transient active disturbance rejection voltage support system considering line power transmission capability, and is used for a client, and includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
constructing a new energy reactive voltage control model considering the power transmission capability of a line, and regulating and controlling the grid-connected voltage of a new energy grid-connected point according to the new energy reactive voltage control model;
constructing a new energy grid-connected link control loop for fault voltage support, wherein the new energy grid-connected link control loop comprises a grid-connected voltage closed loop based on a PI controller structure and a power feedforward branch based on a latch structure;
grid-connected voltage V of new energy grid-connected point PCC And grid-connected voltage reference valueTaking the difference, inputting the difference value into the grid-connected voltage closed loop, and outputting a first partial reference value I of q-axis current qr1 Wherein the q-axis current first part reference value I is calculated qr1 The expression of (2) is:
wherein k is p Is proportional coefficient, k of PI controller i Integrating the coefficient for the PI controller, and s is the Laplacian;
generating a q-axis current second part reference value I according to the power feedforward branch qr2 Wherein the q-axis current second part reference value I is calculated qr2 The expression of (2) is:
in the method, in the process of the invention,for t=t after failure 0 Grid-connected voltage at +Deltat, +.>For t=t after failure 0 Q-axis current at +Δt +.>For pre-fault t=t 0 Grid-connected voltage at time, ">For pre-fault t=t 0 Q-axis current at time;
according to the q-axis current first part reference value I qr1 And the q-axis current second part reference value I qr2 Calculating the final q-axis current reference value I qr And the q-axis current reference value I qr And controlling the current controller command value of the grid-connected system under the serious fault of the power grid to obtain the PWM modulation voltage.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product, which may be stored in a computer-readable storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the various embodiments or methods of some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. The new energy transient state active disturbance rejection voltage supporting method considering the power transmission capability of the line is characterized by comprising the following steps of:
constructing a new energy reactive voltage control model considering the power transmission capability of a line, and regulating and controlling the grid-connected voltage of a new energy grid-connected point according to the new energy reactive voltage control model;
constructing a new energy grid-connected link control loop for fault voltage support, wherein the new energy grid-connected link control loop comprises a grid-connected voltage closed loop based on a PI controller structure and a power feedforward branch based on a latch structure;
grid-connected voltage V of new energy grid-connected point PCC And grid-connected voltage reference valueTaking the difference, inputting the difference value into the grid-connected voltage closed loop, and outputting a first partial reference value I of q-axis current qr1 Wherein the q-axis current first part reference value I is calculated qr1 The expression of (2) is:
wherein k is p Is proportional coefficient, k of PI controller i Integrating the coefficient for the PI controller, and s is the Laplacian;
generating a q-axis current second part reference value I according to the power feedforward branch qr2 Wherein the q-axis current second part reference value I is calculated qr2 The expression of (2) is:
in the method, in the process of the invention,for t=t after failure 0 Grid-connected voltage at +Deltat, +.>For t=t after failure 0 Q-axis current at +Δt +.>For pre-fault t=t 0 Grid-connected voltage at time, ">For pre-fault t=t 0 Q-axis current at time;
according to the q-axis current first part reference value I qr1 And the q-axis current second part reference value I qr2 Calculating the final q-axis current reference value I qr And the q-axis current reference value I qr And controlling the current controller command value of the grid-connected system under the serious fault of the power grid to obtain the PWM modulation voltage.
2. The new energy transient active disturbance rejection voltage support method considering line power transmission capability according to claim 1, wherein the expression of the new energy reactive voltage control model is:
wherein V is PCC Grid-connected voltage of new energy grid-connected point, V g Is equivalent to the system voltage, I d Controlling d-axis current component and X for new energy under dq coordinate system g For equivalent reactance of the system, I q And controlling the q-axis current component for the new energy source under the dq coordinate system.
3. The method of claim 1, wherein the generating the q-axis current second portion reference value I from the power feed-forward branch qr2 Comprising the following steps:
latching the pre-fault t=t according to the latch 0 Grid-connected voltage at momentAnd pre-fault t=t 0 Q-axis current +.>And with the real-time measured post-fault t=t 0 Grid-connected voltage at +Deltat>And t=t after failure 0 Q-axis current at +Deltat>Equivalent reactance X of system g Co-computing the reference value I of the second part of the q-axis current qr2 。
4. The new energy transient active disturbance rejection voltage support method according to claim 1, wherein a final q-axis current reference value I is calculated qr The expression of (2) is: i qr =I qr1 -I qr2 。
5. A new energy transient active disturbance rejection voltage support system that accounts for line power transfer capability, comprising:
the first construction module is configured to construct a new energy reactive voltage control model considering the power transmission capacity of the line, and regulate and control the grid-connected voltage of a new energy grid-connected point according to the new energy reactive voltage control model;
the second construction module is configured to construct a new energy grid-connected link control loop for fault voltage support, wherein the new energy grid-connected link control loop comprises a grid-connected voltage closed loop constructed based on a PI controller and a power feedforward branch constructed based on a latch;
an output module configured to output a grid-connected voltage V of the new energy grid-connected point PCC And grid-connected voltage reference valueMaking a difference, and inputting the difference into the grid-connected voltage closed loopOutput q-axis current first part reference value I qr1 Wherein the q-axis current first part reference value I is calculated qr1 The expression of (2) is:
wherein k is p Is proportional coefficient, k of PI controller i Integrating the coefficient for the PI controller, and s is the Laplacian;
a generation module configured to generate a q-axis current second part reference value I according to the power feedforward branch qr2 Wherein the q-axis current second part reference value I is calculated qr2 The expression of (2) is:
in the method, in the process of the invention,for t=t after failure 0 Grid-connected voltage at +Deltat, +.>For t=t after failure 0 Q-axis current at +Δt +.>For pre-fault t=t 0 Grid-connected voltage at time, ">For pre-fault t=t 0 Q-axis current at time;
a control module configured to control the first partial reference value I according to the q-axis current qr1 And the q-axis current second part reference value I qr2 Calculating the final q-axis current reference value I qr And the q-axis current reference value I qr And controlling the current controller command value of the grid-connected system under the serious fault of the power grid to obtain the PWM modulation voltage.
6. An electronic device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 4.
7. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method of any of claims 1 to 4.
CN202311577966.7A 2023-11-24 2023-11-24 New energy transient state active disturbance rejection voltage supporting method considering line power transmission capability Pending CN117559465A (en)

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