A voltage and frequency regulation control system based on simulation modeling

Abstract

The present invention provides a voltage and frequency regulation control system based on simulation modeling. The power grid connection relationship is drawn according to a primary wiring diagram, basic equipment is simulated and modeled, dynamic and static parameters of the equipment are input, and a network hierarchical topology is built to form a voltage and frequency regulation control system. The frequency and voltage regulation control system includes a power grid main station, a power grid substation, a dynamic monitoring system and a control system. The dynamic monitoring system is used to capture and monitor the dynamic data of various equipment in the power grid main station and the power grid substation in real time, and monitor the data. The control system is used to regulate various parameters of the substation. The power grid main station is used to regulate the power grid substation after summarizing the monitoring data. The present invention realizes real-time monitoring and control of the power grid and rapid frequency and voltage response.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid control systems, and in particular to a voltage and frequency regulation control system based on simulation modeling. Background Art

[0002] In recent years, wind power and photovoltaic power stations have developed rapidly. As the proportion of new energy output continues to increase, conventional power sources have been replaced in large quantities, and the system's rotational inertia and frequency regulation capabilities have continued to decline. When AC and DC faults lead to large power shortages, the frequency control characteristics of the power grid have become increasingly prominent, which can easily induce frequency problems in the entire network. New energy power stations have slow frequency response, and conventional units have high pressure and high cost for frequency regulation and peak regulation. The primary frequency regulation function of new energy power stations is

[0003] Energy is the development trend of new energy technology. The large-scale access of new energy projects to the power grid will mainly bring about the following three problems: the system frequency and voltage regulation capabilities continue to decline under the high proportion of new energy; the new energy units are not adaptable to the power grid, and the risk of large-scale grid disconnection increases; the interaction of multiple power electronic equipment is complex, and the oscillation problem is prominent. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a voltage and frequency regulation control system based on simulation modeling to solve the problems raised in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a voltage and frequency regulation control system based on simulation modeling, which draws the grid connection relationship according to the primary wiring diagram, simulates and models the basic equipment, inputs the dynamic and static parameters of the equipment, and builds the network hierarchical topology to model and form a voltage and frequency regulation control system. The frequency and voltage regulation control system includes a grid main station, a grid substation, a dynamic monitoring system and a control system. The dynamic monitoring system is used to capture and monitor the dynamic data of various equipment in the grid main station and the grid substation in real time, and monitor the data. The control system is used to regulate various parameters of the substation. The grid main station is used to regulate the grid substation after summarizing the monitoring data.

[0008] Preferably, the dynamic monitoring system includes an AVR system synchronous monitoring module and an APC system real-time monitoring module. The AVR system synchronous monitoring module periodically scans and monitors the high-voltage bus voltage in the power grid. When the voltage is out of the limit, the reactive power in the power grid substation is adjusted to regulate the voltage. The APC system synchronous monitoring module is used to detect the active power target value issued by the master station in real time. When the active power of the power grid substation exceeds the threshold range of the active power target value, the APC system synchronous monitoring module will respond in time to adjust the active power of the power grid substation.

[0009] Preferably, the scanning cycle time scale of the AVR system synchronous monitoring module is specifically in the millisecond level, and the voltage limit of the AVR system synchronous monitoring module includes an upper voltage limit and a lower voltage limit.

[0010] Preferably, the control system includes a PFC system, an AVC electric field reactive voltage automatic control module and an AGC electric field active power automatic control module, the PFC system is used to detect and control the frequency range in the power grid, the AVC electric field reactive voltage automatic control module is used to regulate the bus voltage of the power grid substation, and the AGC electric field active power automatic control module is used to respond to the power of the power grid substation at the fastest speed according to the active power target value issued by the master station.

[0011] Preferably, the PFC system periodically scans and monitors the frequency in the electric field, and the scanning time scale is in milliseconds, and sets limits on the frequency range, and has different corresponding sensitivities for different power grid substation devices.

[0012] Preferably, after the frequency in the power grid exceeds the limit, PFC control is activated, and an active power control instruction is sent to the power grid sub-end to achieve power grid frequency modulation.

[0013] Preferably, the AVC electric field reactive voltage automatic control module calculates and analyzes various data of the power grid substation, monitors the operating status of the substation, processes the corresponding data and stores it in a database, and has an abnormal or fault alarm for the substation status.

[0014] Preferably, the AVC electric field reactive voltage automatic control module regulates various devices in the power grid substation according to the voltage target value issued by the power grid master station, so as to achieve the bus voltage following the voltage target value, and the communication terminal continues to regulate according to the preset closed-loop mode.

[0015] Preferably, the AVR system synchronous monitoring module and the AVC electric field reactive voltage automatic control module cooperate with each other to control the power grid substation. The AVR system synchronous monitoring module monitors the voltage and issues control instructions, and the AVC electric field reactive voltage automatic control module executes the corresponding instructions.

[0016] (III) Beneficial effects

[0017] The present invention provides a voltage and frequency regulation control system based on simulation modeling, which has the following beneficial effects: a PFC system is provided, that is, a primary frequency regulation system adopts an embedded control system, the system will synchronously monitor the system frequency of the wind farm, when the system frequency deviates from the target frequency, the PFC system reduces the frequency deviation by adjusting the active power of the wind turbine set, and realizes rapid frequency regulation of the power grid, the AVR system will synchronously monitor the high-voltage bus voltage of the wind farm, when the voltage suddenly changes or exceeds the limit, the AVR system will adjust the reactive power of the wind turbine set through the AVC electric field reactive voltage automatic control module to realize voltage control, when the AVC substation normally receives the high-voltage side bus voltage control target issued by the dispatching master station, it controls various control objects in the electric field, and realizes that the voltage of the high-voltage side bus follows the control target of the dispatching master station; when the communication with the dispatching master station is interrupted, it is closed in an on-site manner , it is controlled according to the pre-given high-voltage side bus voltage target curve, and an APC real-time detection system is also provided. The APC system monitors the active power target value issued by the master station in real time. When the active power of the substation grid-connected point exceeds the threshold range of the active power target value, the system will respond in time, and adjust the active power output of the wind turbine set through the AGC electric field active power automatic control module to make the active power of the grid-connected point return to the threshold range of the active power target value. The electric field AGC substation is based on the active power target value issued by the adjustment center, combined with the real-time operating conditions of the electric field unit and the booster station, considering various safety constraints of the power grid and equipment, with the fastest adjustment speed and the least impact on the unit as the goal, and uses the optimization control algorithm to optimize and calculate to determine the output target value of a single unit. At the same time, the software is used to simulate the component equipment in the system. The system synchronously collects dynamic data to realize online simulation control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the dynamic detection system of the present invention;

[0020] Figure 3 It is a schematic diagram of the control system structure of the present invention. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0026] The embodiment of the present invention provides a voltage and frequency regulation control system based on simulation modeling. The power grid connection relationship is drawn according to a primary wiring diagram, the basic equipment is simulated and modeled, the dynamic and static parameters of the equipment are input, and a network hierarchical topology is built to model and form a voltage and frequency regulation control system. The frequency and voltage regulation control system includes a power grid main station, a power grid substation, a dynamic monitoring system and a control system. The dynamic monitoring system is used to capture and monitor the dynamic data of various equipment in the power grid main station and the power grid substation in real time, and monitor the data. The control system is used to regulate various parameters of the substation. The power grid main station is used to regulate the power grid substation after summarizing the monitoring data.

[0027] The dynamic monitoring system includes an AVR system synchronous monitoring module and an APC system real-time monitoring module. The AVR system synchronous monitoring module periodically scans and monitors the high-voltage bus voltage in the power grid. When the voltage is out of the limit, the reactive power in the power grid substation is adjusted to regulate the voltage. The APC system synchronous monitoring module is used to detect the active power target value issued by the master station in real time. When the active power of the power grid substation exceeds the threshold range of the active power target value, the APC system synchronous monitoring module will respond in time and adjust the active power of the power grid substation. The scanning cycle time scale of the AVR system synchronous monitoring module is specifically in the millisecond level, and the voltage limit of the AVR system synchronous monitoring module includes an upper voltage limit and a lower voltage limit. The control system includes a PFC system, an AVC electric field reactive voltage automatic control module and an AGC electric field active power automatic control module. The PFC system is used to detect and control the frequency range in the power grid, the AVC electric field reactive voltage automatic control module is used to regulate the bus voltage of the power grid substation, and the AGC electric field active power automatic control module is used to perform the fastest control of the power grid substation according to the active power target value issued by the master station. The power response of the speed, the PFC system periodically scans and monitors the frequency in the electric field, and the scanning time scale is millisecond level, and sets limits on the frequency range, and sets different corresponding sensitivities for different power grid substation equipment. After the frequency in the power grid breaks through the limit, the PFC control is activated, and the active power control instructions of the power grid sub-end are sent to realize the power grid frequency modulation. The AVC electric field reactive voltage automatic control module has the function of calculating and analyzing various data of the power grid substation, operating and monitoring the operating status of the substation, and storing the corresponding data in the database after processing. There is an abnormal or fault alarm for the substation status. The AVC electric field reactive voltage automatic control module regulates various equipment in the power grid substation with the voltage target value issued by the power grid master station to realize the bus voltage following the voltage target value. The communication terminal continues to regulate according to the preset closed-loop mode. The AVR system synchronous monitoring module and the AVC electric field reactive voltage automatic control module cooperate with each other to control the power grid substation. The AVR system synchronous monitoring module monitors the voltage and issues control instructions, and the AVC electric field reactive voltage automatic control module executes the corresponding instructions.

[0028] In summary, a PFC system, that is, a primary frequency regulation system adopts an embedded control system. The system will synchronously monitor the system frequency of the wind farm. When the system frequency deviates from the target frequency, the PFC system reduces the frequency deviation by adjusting the active power of the wind turbines to achieve rapid frequency regulation of the power grid. The AVR system will synchronously monitor the high-voltage bus voltage of the wind farm. When the voltage suddenly changes or exceeds the limit, the AVR system will adjust the reactive power of the wind turbines through the AVC electric field reactive voltage automatic control module to achieve voltage control. When the AVC substation normally receives the high-voltage side bus voltage control target issued by the dispatching master station, it controls various control objects in the electric field to achieve the control target of the pressure side bus voltage following the dispatching master station; when the communication with the dispatching master station is interrupted, the high-voltage side bus voltage is controlled in accordance with the local closed-loop method according to the pre-given high-voltage side bus voltage. The target curve is used for control, and an APC real-time detection system is also provided. The APC system monitors the active power target value issued by the master station in real time. When the active power of the substation grid-connected point exceeds the threshold range of the active power target value, the system will respond in time and adjust the active power output of the wind turbine set through the AGC electric field active power automatic control module to make the active power of the grid-connected point return to the threshold range of the active power target value. The electric field AGC substation is based on the active power target value issued by the adjustment center, combined with the real-time operating conditions of the electric field units and booster stations, and considering various safety constraints of the power grid and equipment. With the fastest adjustment speed and the least impact on the units as the goal, the optimization control algorithm is used to optimize and calculate to determine the output target value of a single unit. At the same time, the software is used to simulate and model the components and equipment in the system. The system synchronously collects dynamic data to realize online simulation control.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A voltage and frequency regulation control system based on simulation modeling, characterized in that: Draw the grid connection relationship according to the primary wiring diagram, simulate and model the basic equipment, input the dynamic and static parameters of the equipment, and build a network hierarchical topology to model and form a voltage and frequency regulation control system. The voltage and frequency regulation control system includes a power grid main station, a power grid substation, a dynamic monitoring system and a control system. The dynamic monitoring system is used to capture and monitor the dynamic data of various equipment in the power grid main station and the power grid substation in real time, and monitor the data. The control system is used to regulate various parameters of the substation. The power grid main station is used to regulate the power grid substation after summarizing the monitoring data. The dynamic monitoring system includes an AVR system synchronous monitoring module and an APC system real-time monitoring module. The AVR system synchronous monitoring module periodically scans and monitors the high-voltage bus voltage in the power grid. When the voltage is out of the limit, the reactive power in the power grid substation is adjusted to regulate the power. The voltage is regulated, the APC system synchronous monitoring module is used to detect the active power target value issued by the master station in real time, when the active power of the power grid substation exceeds the threshold range of the active power target value, the APC system synchronous monitoring module will respond in time to adjust the active power of the power grid substation, the control system includes a PFC system, an AVC electric field reactive voltage automatic control module and an AGC electric field active power automatic control module, the PFC system is used to detect and control the frequency range in the power grid, the AVC electric field reactive voltage automatic control module is used to regulate the bus voltage of the power grid substation, the AGC electric field active power automatic control module is used to perform the fastest power response to the power grid substation according to the active power target value issued by the master station, the PFC control is activated after the frequency in the power grid breaks through the limit, the active power control instruction of the power grid sub-end is sent, and the power grid frequency modulation is realized.

2. The voltage and frequency regulation control system based on simulation modeling according to claim 1 is characterized in that: The scanning cycle time scale of the AVR system synchronous monitoring module is specifically in the millisecond level, and the voltage limit of the AVR system synchronous monitoring module includes an upper voltage limit and a lower voltage limit.

3. The voltage and frequency regulation control system based on simulation modeling according to claim 1 is characterized in that: The PFC system periodically scans and monitors the frequency in the electric field, and the scanning time scale is in the millisecond level, and sets limits on the frequency range, and has different response sensitivities for different power grid substation equipment.

4. The voltage and frequency regulation control system based on simulation modeling according to claim 1 is characterized in that: The AVC electric field reactive voltage automatic control module calculates and analyzes various data of the power grid substation, monitors the operating status of the substation, and stores the processed corresponding data in the database, and sets an abnormal or fault alarm for the substation status.

5. The voltage and frequency regulation control system based on simulation modeling according to claim 1 is characterized in that: The AVC electric field reactive voltage automatic control module regulates various devices in the power grid substation according to the voltage target value issued by the power grid master station, so that the bus voltage follows the voltage target value, and the communication terminal continues to regulate according to the preset closed-loop mode.

6. The voltage and frequency regulation control system based on simulation modeling according to claim 1 is characterized in that: The AVR system synchronous monitoring module and the AVC electric field reactive voltage automatic control module cooperate with each other to control the power grid substation. The AVR system synchronous monitoring module monitors the voltage and issues control instructions, and the AVC electric field reactive voltage automatic control module executes the corresponding instructions.

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