Power grid ACE control method and system based on dynamic calculation of regulation rate

Abstract

The application belongs to the technical field of power grid power control, and discloses a power grid ACE control method based on dynamic calculation of adjustment rate, comprising the following steps: obtaining the duration after zero-crossing of power grid ACE and the remaining adjustment time of the ACE; obtaining the judgment result of whether to adjust the adjustment rate of the power grid according to the difference between the ACE zero-crossing time limit value and the duration after zero-crossing, and the remaining adjustment time of the ACE; if adjustment is needed, obtaining the power grid adjustment rate increment according to the real-time adjustment rate of the power grid and the theoretical adjustment rate of the power grid; and adjusting the number of units participating in the adjustment of the power grid ACE according to the power grid adjustment rate increment. According to the dynamic change amplitude and change time of the regional control deviation, the application judges whether to adjust the adjustment rate, and if adjustment is needed, the adjustment rate increment is obtained according to the real-time adjustment rate and the theoretical adjustment rate, the units participating in the adjustment are dynamically adjusted, the real-time adjustment capability of the power grid is effectively improved, and the safe and stable operation of the power grid is ensured.

Description

Technical Field

[0001] This application relates to the field of power grid control technology, and in particular to a power grid ACE control method and system based on dynamic calculation of regulation rate. Background Technology

[0002] Under the new circumstances of ultra-high voltage power grids and regional power grid interconnection, the connections between power grids at all levels are becoming increasingly close, and the requirements for coordination and cooperation between power grids and generating units are also becoming increasingly stringent. At the same time, my country's installed capacity and power generation of new energy sources are rapidly increasing, and the interconnection between regions is becoming increasingly close. The power system will face a large amount of power transfer between regions and large-scale fluctuations in power flow.

[0003] To ensure the safe and stable operation of the power grid, all grid-connected generating units are generally required to activate Automatic Generation Control (AGC) functions according to grid management regulations. The grid AGC function is invoked during each AGC data acquisition cycle to evaluate the AGC's control behavior. The evaluation standard is primarily the NERC (National Electrical Research Council) behavioral guidelines. Grid AGC performance can calculate and statistically analyze performance indicators for the operating area and generating units. It can also calculate the pass rates for frequency, switching power, and ACE (area control deviation) under different threshold values ​​(e.g., frequency deviations of 0.1 Hz and 0.2 Hz) and different conditions (e.g., whether AGC is activated). After ACE is generated, it is distributed to each AGC unit according to a certain mechanism to jointly eliminate deviations and achieve grid frequency stability. Figure 1 As shown.

[0004] Currently, the main standards used for evaluating AGC control performance in China are the two sets of standards promoted by NERC: A1 and A2 standards, and CPS1 and CPS2 standards. For example, the power grids in North China use the A1 and A2 standards, while those in East China use the CPS1 and CPS2 standards. NERC officially adopted the A1 and A2 standards as early as 1973 to evaluate the control performance of the power grid under normal conditions. The A1 standard states that the ACE (Accelerated Energizer) of the control area must cross zero at least once within a specified time. The A2 standard states that the average ACE of the control area within 10 minutes must be controlled within a specified range. d Within the NERC, the compliance rate for achieving A1 and A2 standards in each control area must be above 90%. By implementing A1 and A2 standards, the ACE (Accelerated Energy Consumption) in each control area remains close to zero, thus ensuring a balance between electricity load and generation, planned exchange, and actual exchange.

[0005] In 1996, NERC introduced the CPS1 and CPS2 control performance evaluation standards, which were officially implemented in 1998, replacing the previous A1 and A2 standards. Their contents are as follows:

[0006] CPS1 standard requirements

[0007] Where: AVG period [] indicates that the values ​​within the brackets are averaged; ACE AVE-min The average ACE over 1 minute, in megawatts (MW), requires sampling every 2 seconds, then averaging the 30 values; ΔF AVE-min The average value of the frequency deviation over one minute, in Hz, requires sampling once per second, and then averaging the 60 values; B i ε1 is the deviation coefficient for the control area, in MW / 0.1Hz, and is positive; ε1 is the root mean square control target value for the annual 1-minute frequency average deviation of the interconnected power grid, in Hz. The CPS1 standard is similar to the A1 and A2 standards, requiring that the average value of ACE within a specified time period must be controlled within a specified range.

[0008] Regardless of whether a regional power grid adopts the A1, A2, or CPS1 / CPS2 standards, it must comply with the relevant national standards and implementation rules, as stipulated in the "Two Detailed Rules." For example, the "Implementation Rules for the Management of Power Plant Grid Connection and Operation in North China" stipulates that... Figure 2 The active power change rate (ACE) is typically set to 1.5%Pe (Pe is the rated power of the generator unit) or 2%Pe, with the generator unit increasing or decreasing its active power at the same rate. In actual grid operation, since the rate and number of generator units operating under AGC (Automatic Generation Control) are fixed daily, theoretically, the active power change rate of the regional grid on a given day is also fixed. However, in actual operation, situations such as sudden changes in grid power or AGC reversing primary frequency regulation frequently occur, resulting in insufficient regulation rate of the overall active power of the generator units within a certain time period of the day. This fails to guarantee that the average value of the regional grid control deviation is controlled within the specified range over a certain period. If the ACE is too large, a large number of operating generator units need to be disconnected at the sending end of the grid, and a certain amount of load needs to be cut off at the receiving end; otherwise, a chain reaction will occur, leading to system instability.

[0009] How to provide a method for dynamically regulating participating generating units based on the regional control deviation of the power grid is an urgent problem to be solved. Summary of the Invention

[0010] To address the aforementioned problems, this application proposes a power grid ACE control method and system based on dynamic calculation of the regulation rate. This method can dynamically adjust the participating generating units according to the regional control deviation of the power grid, ensuring the stable operation of the power grid. To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0011] According to a first aspect of the embodiments of this application, a power grid ACE control method based on dynamic calculation of regulation rate is provided.

[0012] In one embodiment, a power grid ACE control method based on dynamic calculation of regulation rate includes:

[0013] Obtain the duration after the control deviation ACE of the power grid area crosses zero and the remaining adjustment time of the ACE;

[0014] Based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, as well as the remaining adjustment time of the ACE, a judgment result is obtained on whether to adjust the grid regulation rate. If adjustment is required, the grid regulation rate increment is obtained based on the real-time grid regulation rate and the theoretical grid regulation rate.

[0015] The number of generating units participating in grid ACE regulation is adjusted according to the grid regulation rate increment.

[0016] Optionally, the step of obtaining the duration after the ACE of the power grid crosses zero includes:

[0017] When ACE crosses zero, record the duration after the zero crossing until the next time ACE crosses zero.

[0018] Optionally, the step of obtaining the remaining adjustment time of the ACE includes: obtaining the remaining adjustment time of the ACE based on the ratio of the absolute value of the real-time ACE value to the real-time adjustment rate of the power grid.

[0019] Optionally, the real-time regulation rate of the power grid is obtained based on the ratio of the change amplitude of ACE to the duration after ACE crosses zero.

[0020] Optionally, the step of determining whether to adjust the grid regulation rate based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, and the remaining adjustment time of the ACE, includes:

[0021] If T R ≤(T B -T DIf the grid regulation rate is not adjusted, then no adjustment is needed.

[0022] If T R >(T B -T D If this happens, the power grid regulation rate needs to be adjusted.

[0023] Among them, T R T represents the remaining adjustment time for ACE. B T is the ACE zero-crossing time limit. D The duration after ACE crosses zero.

[0024] Optionally, the step of obtaining the adjustment rate increment based on the real-time adjustment rate and the theoretical adjustment rate includes:

[0025] The difference between the real-time regulation rate and the theoretical regulation rate of the power grid is weighted to obtain the increment of the power grid regulation rate. The larger the difference between the theoretical regulation rate and the real-time regulation rate, the larger the weighting coefficient.

[0026] Optionally, the theoretical regulation rate of the power grid is obtained by adding the regulation rate setpoints of all participating units, whereby the regulation rate setpoint of a unit is the product of its rated active power and the percentage of its regulation rate.

[0027] Optionally, the step of adjusting the number of generating units participating in grid ACE regulation according to the grid regulation rate increment includes:

[0028] When the grid regulation rate increment is positive, the number of generating units participating in grid ACE regulation increases.

[0029] When the grid regulation rate increment is negative, the number of generating units participating in grid ACE regulation is reduced.

[0030] According to a second aspect of the embodiments of this application, a power grid ACE control system based on dynamic calculation of regulation rate is provided.

[0031] In one embodiment, the power grid ACE control system based on dynamic calculation of the regulation rate includes: an ACE monitoring module, an ACE remaining adjustment time calculation module, a dynamic adjustment module, and an execution module; wherein...

[0032] The ACE monitoring module is used to monitor the regional control deviation (ACE) of the power grid and obtain the duration after ACE crosses zero.

[0033] The remaining adjustment time of ACE is used by the calculation module to obtain the remaining adjustment time of this ACE based on the real-time adjustment rate of the power grid.

[0034] The dynamic adjustment module is used to determine whether to adjust the grid regulation rate based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, as well as the remaining adjustment time of the current ACE. If adjustment is required, the grid regulation rate increment is obtained based on the real-time grid regulation rate and the theoretical grid regulation rate.

[0035] The execution module is used to adjust the number of generating units participating in grid ACE regulation based on the grid regulation rate increment.

[0036] Optionally, the monitoring module is used to monitor the ACE of the power grid and obtain the duration after the ACE crosses zero, including: obtaining the time of the ACE crossing zero, recording the duration after the zero crossing, until the next time the ACE crosses zero ends.

[0037] Optionally, the ACE remaining adjustment time calculation module is used to obtain the remaining adjustment time of the ACE based on the ratio of the absolute value of the real-time ACE value to the real-time adjustment rate of the power grid.

[0038] Optionally, the ACE remaining adjustment time calculation module is used to obtain the real-time grid regulation rate based on the ratio of the change amplitude of ACE to the duration after ACE crosses zero.

[0039] Optionally, the dynamic adjustment module is used to obtain a judgment result on whether to adjust the grid regulation rate based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, and the remaining adjustment time of the current ACE, including:

[0040] If T R ≤(T B -T D If the grid regulation rate is not adjusted, then no adjustment is needed.

[0041] If T R >(T B -T D If this happens, the power grid regulation rate needs to be adjusted.

[0042] Among them, T R T represents the remaining adjustment time for ACE. B T is the ACE zero-crossing time limit. D The duration after ACE crosses zero.

[0043] Optionally, the ACE remaining adjustment time calculation module is used to obtain the grid adjustment rate increment based on the grid real-time adjustment rate and the grid theoretical adjustment rate, including: weighting the difference between the grid real-time adjustment rate and the grid theoretical adjustment rate to obtain the grid adjustment rate increment.

[0044] Optionally, the ACE remaining adjustment time calculation module further includes: adding the adjustment rate setpoints of all participating units to obtain the theoretical adjustment rate of the power grid, wherein the adjustment rate setpoint of a unit is the product of the rated active power of the unit and the percentage of the adjustment rate of the unit.

[0045] Optionally, the execution module is used to adjust the number of generating units participating in grid ACE regulation according to the grid regulation rate increment, including:

[0046] When the grid regulation rate increment is positive, the number of generating units participating in grid ACE regulation increases.

[0047] When the grid regulation rate increment is negative, the number of generating units participating in grid ACE regulation is reduced.

[0048] According to a third aspect of the embodiments of this application, a computer device is provided.

[0049] In some embodiments, the computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method described above.

[0050] The technical solutions provided in this application embodiment may include the following beneficial effects:

[0051] The real-time regulation rate of the power grid is affected by various factors such as changes in the regulation capacity of generating units, and there is a difference between it and the theoretical regulation rate of the power grid. In this embodiment, the dynamic change amplitude and change time of the regional control deviation are used to determine whether to adjust the power grid regulation rate. If adjustment is required, the power grid regulation rate increment is obtained based on the real-time regulation rate and the theoretical regulation rate of the power grid, and the participating generating units are dynamically adjusted to effectively improve the real-time regulation capability of the power grid and ensure the stable operation of the power grid.

[0052] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0053] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0054] Figure 1 This is the schematic diagram of the existing ACE control system;

[0055] Figure 2 This is a schematic diagram of existing ACE control commands;

[0056] Figure 3 This is a flowchart illustrating a power grid ACE control method based on dynamic calculation of regulation rate, according to an exemplary embodiment.

[0057] Figure 4 This is a schematic diagram of a power grid ACE control system based on dynamic calculation of regulation rate, according to an exemplary embodiment.

[0058] Figure 5 This is a logical schematic diagram of a power grid ACE control system based on dynamic calculation of regulation rate, according to an exemplary embodiment.

[0059] Figure 6 This is a schematic diagram of the structure of a computer device according to an exemplary embodiment. Detailed Implementation

[0060] The following description and accompanying drawings fully illustrate specific embodiments described herein to enable those skilled in the art to practice them. Some embodiments may include or substitute parts and features of other embodiments. The scope of the embodiments herein encompasses the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0061] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used herein to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this document and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements, or direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0062] In this document, unless otherwise stated, the term "multiple" means two or more.

[0063] In this article, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0064] In this article, the term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0065] Where there is no conflict, the embodiments and features described in this application may be combined with each other.

[0066] The real-time regulation rate of the power grid is affected by various factors, such as changes in the regulation capacity of generating units, and differs from the theoretical regulation rate of the power grid. This application proposes a power grid ACE control method based on dynamic calculation of the regulation rate. According to the dynamic change amplitude and change time of the regional control deviation, it is determined whether to adjust the power grid regulation rate. If adjustment is required, the power grid regulation rate increment is obtained based on the real-time regulation rate and the theoretical regulation rate of the power grid, and the participating generating units are dynamically adjusted to effectively improve the real-time regulation capability of the power grid and ensure the stable operation of the power grid.

[0067] Figure 3 An embodiment of the ACE control method for power grids based on dynamic calculation of regulation rate is shown in this application.

[0068] In this embodiment, the power grid ACE control method based on dynamic calculation of regulation rate includes the following steps:

[0069] Step S1: Obtain the duration after the control deviation ACE of the power grid area crosses zero and the remaining adjustment time of this ACE;

[0070] Step S2: Based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, and the remaining adjustment time of the ACE, obtain the judgment result of whether to adjust the grid regulation rate. If adjustment is required, obtain the grid regulation rate increment based on the real-time grid regulation rate and the theoretical grid regulation rate.

[0071] Step S3: Adjust the number of generating units participating in grid ACE regulation according to the grid regulation rate increment. A positive increment increases the number of generating units participating in grid ACE regulation, while a negative increment decreases the number of generating units participating in grid ACE regulation.

[0072] This application proposes a power grid ACE control method based on dynamic calculation of regulation rate, which dynamically regulates participating generating units, effectively improving the real-time regulation capability of the power grid and ensuring the stable operation of the power grid.

[0073] Optionally, the ACE zero-crossing time limit T B The time limit can be set to 10 minutes or 15 minutes, or other time limits depending on the needs of the power grid operation.

[0074] Optionally, the duration after the ACE crosses zero is obtained through the following steps: real-time acquisition of the ACE of the power grid; when the ACE crosses zero, the duration after the zero cross is calculated according to the set scanning cycle until the next zero cross of the ACE ends, then the calculation is reset and restarted.

[0075] Optionally, the remaining adjustment time of the ACE is obtained based on the real-time regulation rate of the power grid and the real-time value of the ACE. Specifically, the remaining adjustment time T of the ACE... R The absolute value of the real-time ACE and the real-time adjustment rate V A The ratio is calculated to obtain:

[0076]

[0077] Optionally, the real-time grid adjustment rate is obtained based on the magnitude of the change in ACE and the duration after ACE crosses zero. Specifically, the real-time grid adjustment rate V... A Using the amplitude of ACE change ΔACE and the duration T after ACE crosses zero D Obtained through dynamic calculation, i.e.:

[0078]

[0079] The amplitude of the change in ACE, ΔACE, is the absolute value of the difference between the initial value of ACE exceeding the limit and the real-time value of ACE, that is:

[0080] ΔACE=|ACE 越限初始值 -ACE 实时值 |

[0081] ACE 越限初始值 This value represents the value when the ACE (Energy Availability) exceeds the set power limit for the first time in one direction. It is set by the regional power grid based on the scale of grid-connected power generation within its jurisdiction, and the larger the overall power generation scale of the power grid, the larger this value.

[0082] Optionally, the step of determining whether to adjust the grid regulation rate based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, and the remaining adjustment time of the ACE, specifically includes:

[0083] If T R ≤(T B -T D If the grid regulation rate is not adjusted, then no adjustment is needed.

[0084] If T R >(T B -T D If this is the case, then the power grid regulation rate needs to be adjusted.

[0085] Optionally, the step of obtaining the grid regulation rate increment based on the real-time grid regulation rate and the theoretical grid regulation rate specifically involves: weighting the difference between the real-time grid regulation rate and the theoretical grid regulation rate to obtain the grid regulation rate increment.

[0086] Specifically, the grid regulation rate increment V Z The theoretical regulation rate V of the power grid I With the real-time adjustment rate V of the power grid A The difference is obtained by weighting, that is:

[0087] V Z =K*ΔV=K*(V I -V A )

[0088] Wherein, the weighting coefficient K is a set value, and the theoretical regulation rate V of the power grid is... I With the real-time adjustment rate V of the power grid A The larger the difference, the larger the weighting coefficient K, meaning that the ACE regression time is shortened by increasing the grid regulation rate.

[0089] Optionally, the theoretical regulation rate of the power grid is obtained by adding the regulation rate setpoints of all participating generating units. Specifically, the theoretical regulation rate V of the power grid... I The regulation rate setting is obtained by adding the regulation rate setpoints of all n generating units participating in the regulation. The regulation rate setpoint of a unit is the product of its rated active power and the percentage of its regulation rate, i.e.:

[0090]

[0091] Among them, P i R is the rated active power of the i-th unit; i R represents the percentage of the regulating rate of the i-th generating unit. i The value range is 1%-2%.

[0092] like Figure 4 As shown in the embodiment of this application, a power grid ACE control system based on dynamic calculation of adjustment rate is also proposed, including: an ACE monitoring module, an ACE remaining adjustment time calculation module, and a dynamic adjustment module.

[0093] The ACE monitoring module monitors the ACE of the power grid and obtains the duration after the ACE crosses zero;

[0094] The ACE remaining adjustment time calculation module obtains the remaining adjustment time of the regional control deviation value ACE based on the real-time adjustment rate of the power grid.

[0095] The dynamic adjustment module determines whether to adjust the grid regulation rate based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, as well as the remaining adjustment time of the current ACE. If adjustment is required, the grid regulation rate increment is obtained based on the real-time grid regulation rate and the theoretical grid regulation rate.

[0096] The execution module is used to adjust the number of generating units participating in grid ACE regulation based on the grid regulation rate increment. When the grid regulation rate increment is positive, the number of generating units participating in grid ACE regulation is increased; when the grid regulation rate increment is negative, the number of generating units participating in grid ACE regulation is decreased.

[0097] The working principles of the ACE monitoring module, ACE remaining adjustment time calculation module, dynamic adjustment module, and execution module are the same as those of the above method embodiments, and will not be repeated here.

[0098] Figure 5 A logical schematic diagram of a power grid ACE control system based on dynamic calculation of regulation rate is shown.

[0099] The ACE monitoring module includes: high and low limit alarm module HLALM, counter module CNT1, counter module CNT2, analog selector AXSEL1, analog generator A1, and multiplier module MUL1;

[0100] The ACE remaining adjustment time calculation module includes: analog selector AXSEL2, subtractor module DEV1, absolute value module ABS1, absolute value module ABS2, divider module DIV1, and divider module DIV2.

[0101] The dynamic adjustment module includes: analog generator A2, analog generator A3, subtractor module DEV2, subtractor module DEV3, multiplier module MUL2, and comparator module CMP.

[0102] The collected regional control deviation ACE is sent to the input terminal X of the high / low limit alarm module HLALM, the input terminal X2 of the subtractor module DEV1, the input terminal X2 of the analog selector AXSEL2, and the input terminal X of the absolute value module ABS2 of the control system. The output terminal Y of the absolute value module ABS2 is connected to the input terminal X1 of the divider DIV2. The output terminal D of the high / low limit alarm module HLALM is connected to the set terminal S of the analog selector AXSEL2. The output terminal D1 of the high / low limit alarm module HLALM is connected to the set terminal S of the counter module CNT1, the reset terminal R of the counter module CNT2, and the set terminal S of the analog selector AXSEL1. The output terminal D2 of the high / low limit alarm module HLALM is connected to the set terminal S of the counter module CNT2 and the reset terminal R of the counter module CNT1. The output signals of the counter module CNT1 and the counter module CNT2 are sent to the input terminals X1 and X2 of the analog selector AXSEL1, respectively.

[0103] The control system sends the value set by analog generator A1 to input terminal X1 of multiplier module MUL1, and the output signal of analog selector AXSEL1 to input terminal X2 of multiplier module MUL1; multiplier module MUL1 calculates the zero-crossing duration T. D One path is sent to the input terminal X2 of the divider DIV1, and the other path is sent to the input terminal X2 of the subtractor module DEV2; the output terminal Y of the subtractor module DEV2 is connected to the input terminal X2 of the comparator module CMP.

[0104] The output signal of analog selector AXSEL2 is sent to its own input terminal X1 and to the input terminal X1 of subtractor module DEV1. The output terminal of subtractor module DEV1 is connected to the input terminal X of absolute value module ABS1, and the output terminal Y of absolute value module ABS1 is connected to the input terminal X1 of divider DIV1. The output terminal Y of divider DIV1 is connected to the input terminal X2 of subtractor module DEV3 and to the input terminal X2 of divider DIV2. The output terminal Y of divider DIV2 is connected to the input terminal X1 of comparator module CMP.

[0105] The input terminal X1 of the subtractor module DEV3 receives the theoretical regulation rate of the power grid, and the output signal is sent to the input terminal X1 of the multiplier module MUL2; the input terminal X2 of the multiplier module MUL2 is connected to the analog generator A3.

[0106] Optionally, the value in the analog generator A1 is a set scan cycle, which can be obtained from the parameter settings of the control system.

[0107] Optionally, the value in the analog generator A2 is the ACE zero-crossing time limit set by the power grid, which is generally 10 minutes or 15 minutes.

[0108] Optionally, the value in the analog generator A3 is a set weighting coefficient K, and the weighting coefficient K ranges from 1.5 to 2.0.

[0109] Optionally, the counter module CNT1 and counter module CNT2 count according to the scan cycle of the control system, that is, the count is incremented by 1 in each scan cycle.

[0110] The power grid ACE control system based on dynamic calculation of regulation rate disclosed in the embodiments of this application can be implemented by analog circuits, digital circuits, or a combination of digital and analog circuits.

[0111] The following is a specific embodiment of the power grid ACE control method based on dynamic calculation of regulation rate according to this application.

[0112] Taking a power grid in North China as an example, the grid is mainly composed of 300MW-class steam drum boiler units. Under normal operation, the total daily active power of the units is approximately 48,000MW, of which 20 thermal power units are in AGC (Automatic Control) mode, with a theoretical regulation rate V. I The speed is approximately 90-130 MW / min; the AGC scanning cycle in the control system is set to 1 second, i.e., 1 second in analog generator A1; the area control deviation (ACE) requires at least one zero crossing within 10 minutes, i.e., 600 seconds in analog generator A2. The "Implementation Rules for Grid-Connected Operation Management of Power Plants in North China" stipulates that: for direct-fired pulverized boiler units with steam drum boilers, the ACE is 1.5% of the rated active power; for pulverized boiler units with intermediate storage silos, the ACE is 2% of the rated active power; and for circulating fluidized bed units and units burning special coal types, the ACE is 1% of the rated active power.

[0113] On a certain day, among 20 AGC units, there are 16 units of 300MW capacity, including 4 energy storage units and 12 direct-fired units; and 4 units of 600MW capacity, all of which are direct-fired units. What is the theoretical regulation rate V of the power grid at this time? I for:

[0114]

[0115] At this time, a UHVDC fault occurs in the power grid, and the regional control deviation value ACE is 900MW. Therefore, the output terminals D and D1 of the high / low limit alarm module HLALM are at a high level (1), and output terminal D2 is at a low level (0). The set terminals S of counter modules CNT1 and CNT2 are at a high level (1) and a low level (0), respectively, and the reset terminals R are at a low level (0) and a high level (1), respectively. Since the scan period is 1 second, the output value of counter module CNT1 is accumulated by incrementing by 1 every second, while the output of counter module CNT2 is 0. The set terminals S of analog selectors AXSEL1 and AXSEL2 are both at a high level (1), so the value of input terminal X1 is selected as the output value. That is, the output of analog selector AXSEL1 is the output value of counter module CNT1, and the output of analog selector AXSEL2 is its own output value, thus maintaining ACE at 900MW. The input terminal X1 of multiplier module MUL1 is the value set by analog generator A1 for 1 second. Therefore, multiplying it by the output value of counter module CNT1 yields the duration T after ACE crosses zero. D .

[0116] 100 seconds after the ACE crosses zero, the ACE decreases to 780. At this time, the output of the counter module CNT1 is 100. The multiplier module MUL1 calculates the duration T after the ACE crosses zero. D The value is 100, so the output of the subtractor module DEV2 is 600-100=500;

[0117] Because the set input S of the analog selector AXSEL2 remains high (1), its output retains its original value of 900. The subtractor module DEV1 has input X1 at 900 and input X2 at 780, so its output is 900 - 780 = 120. After passing through the absolute value module ABS1, the output value is 120. The divider DIV1 has input X1 at 120 and input X2 at T. D =100, then the real-time regulation rate V of the power grid can be obtained. A =120 / 100 = 1.2MW / s; Since the output of the absolute value module ABS2 is the absolute value of the real-time ACE value, 780, the input X1 of the divider DIV2 is 780, and the input X2 is 1.2. The remaining adjustment time T can then be calculated. R =780 / 1.2 = 650;

[0118] The input X1 of the comparator module CMP is the remaining settling time T. R =650, input terminal X2 is the output of subtractor module DEV2 500. Since 650>500, comparator module CMP outputs a high level 1, meaning that the unit regulation rate needs to be adjusted at this time; at the same time, input terminal X1 of subtractor module DEV3 is the theoretical grid regulation rate V. I=1.9, input terminal X2 is the real-time regulation rate V of the power grid. A =1.2, therefore its output is 0.7MW / s = 4.2MW / min. The value set for analog generator A3 is 2, so the power grid regulation rate increment V is obtained. Z =8.4, which is equivalent to adding 2 300MW units or 1 600MW unit to participate in this ACE adjustment.

[0119] The real-time regulation rate of the power grid is affected by various factors such as changes in the regulation capacity of generating units, and there is a difference between it and the theoretical regulation rate. The control method or control system of this application embodiment can obtain the real-time regulation rate of the power grid in real time based on the dynamic change amplitude and change time of the regional control deviation, determine whether to adjust the regulation rate, and if adjustment is required, obtain the regulation rate increment based on the real-time regulation rate and the theoretical regulation rate, and dynamically adjust the generating units participating in the regulation, thereby effectively improving the real-time regulation capability of the power grid.

[0120] Furthermore, the control method or control system of this application embodiment improves the standard requirement that the regional control deviation of the power grid meets the zero crossing within a specified time by dynamically monitoring and analyzing the regional control deviation of the power grid, thereby enabling the notification of adjustment amount, reducing frequency fluctuations of the power grid system, and ensuring the stable operation of the power grid.

[0121] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 6 As shown, the computer device includes a processor, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores static and dynamic information data. The network interface communicates with external terminals via a network connection. When the computer program is executed by the processor, it implements the steps in the above method embodiments.

[0122] Those skilled in the art will understand that Figure 6 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0123] In one embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.

[0124] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps in the method embodiments described above.

[0125] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0126] This application is not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A power grid ACE control method based on dynamic calculation of regulation rate, characterized in that, Includes the following steps: The duration after the control deviation ACE of the power grid area crosses zero and the remaining adjustment time of the ACE are obtained. The remaining adjustment time of the ACE is obtained by the ratio of the absolute value of the real-time ACE value to the real-time adjustment rate of the power grid. Based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, and the remaining adjustment time of the ACE, a judgment result is obtained on whether to adjust the grid regulation rate. If adjustment is required, the grid regulation rate increment is obtained based on the real-time grid regulation rate and the theoretical grid regulation rate, including: weighting the difference between the real-time grid regulation rate and the theoretical grid regulation rate to obtain the grid regulation rate increment. The larger the difference between the theoretical grid regulation rate and the real-time grid regulation rate, the larger the weighting coefficient. The number of generating units participating in grid ACE regulation is adjusted according to the grid regulation rate increment.

2. The power grid ACE control method based on dynamic calculation of regulation rate as described in claim 1, characterized in that, The step of obtaining the duration after the ACE crosses zero in the power grid includes: When ACE crosses zero, record the duration after the zero crossing until the next time ACE crosses zero.

3. The power grid ACE control method based on dynamic calculation of regulation rate as described in claim 1, characterized in that, The real-time regulation rate of the power grid is obtained based on the ratio of the change amplitude of ACE to the duration after ACE crosses zero.

4. The power grid ACE control method based on dynamic calculation of regulation rate as described in claim 1, characterized in that, The step of determining whether to adjust the grid regulation rate based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, and the remaining adjustment time of the ACE, includes: like In this case, there is no need to adjust the power grid regulation rate; like If so, the power grid regulation rate needs to be adjusted; Among them, T R T represents the remaining adjustment time for ACE. B T is the ACE zero-crossing time limit. D The duration after ACE crosses zero.

5. The power grid ACE control method based on dynamic calculation of regulation rate as described in claim 1, characterized in that, The theoretical regulation rate of the power grid is obtained by adding the regulation rate setpoints of all participating units. The regulation rate setpoint of a unit is the product of the unit's rated active power and the percentage of the unit's regulation rate.

6. The power grid ACE control method based on dynamic calculation of regulation rate as described in claim 1, characterized in that, The step of adjusting the number of generating units participating in grid ACE regulation according to the grid regulation rate increment includes: When the grid regulation rate increment is positive, the number of generating units participating in grid ACE regulation increases. When the grid regulation rate increment is negative, the number of generating units participating in grid ACE regulation is reduced.

7. A power grid ACE control system based on dynamic calculation of regulation rate, characterized in that, include: The module includes an ACE monitoring module, an ACE remaining adjustment time calculation module, a dynamic adjustment module, and an execution module; among which, The ACE monitoring module is used to monitor the regional control deviation (ACE) of the power grid and obtain the duration after ACE crosses zero. The ACE remaining adjustment time calculation module is used to obtain the remaining adjustment time of the current ACE based on the real-time adjustment rate of the power grid. Specifically, the remaining adjustment time of the current ACE is obtained by the ratio of the absolute value of the real-time ACE value to the real-time adjustment rate of the power grid. The dynamic adjustment module is used to determine whether to adjust the grid regulation rate based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, as well as the remaining adjustment time of the current ACE. If adjustment is required, the grid regulation rate increment is obtained based on the real-time grid regulation rate and the theoretical grid regulation rate. This includes weighting the difference between the real-time grid regulation rate and the theoretical grid regulation rate to obtain the grid regulation rate increment. The larger the difference between the theoretical grid regulation rate and the real-time grid regulation rate, the larger the weighting coefficient. The execution module is used to adjust the number of generating units participating in grid ACE regulation based on the grid regulation rate increment.

8. The power grid ACE control system based on dynamic calculation of regulation rate as described in claim 7, characterized in that, The monitoring module is used to monitor the ACE of the power grid and obtain the duration after the ACE crosses zero, including: obtaining the time of the ACE crossing zero, recording the duration after the zero crossing, until the next time the ACE crosses zero.

9. The power grid ACE control system based on dynamic calculation of regulation rate as described in claim 7, characterized in that, The ACE remaining adjustment time calculation module is used to obtain the real-time power grid regulation rate based on the ratio of the change amplitude of ACE to the duration after ACE crosses zero.

10. A power grid ACE control system based on dynamic calculation of regulation rate as described in claim 7, characterized in that, The dynamic adjustment module is used to determine whether to adjust the grid regulation rate based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, and the remaining adjustment time of the current ACE, including: like In this case, there is no need to adjust the power grid regulation rate; like If so, the power grid regulation rate needs to be adjusted; Among them, T R T represents the remaining adjustment time for ACE. B T is the ACE zero-crossing time limit. D The duration after ACE crosses zero.

11. A power grid ACE control system based on dynamic calculation of regulation rate as described in claim 7, characterized in that, The ACE remaining adjustment time calculation module further includes: adding the adjustment rate setpoints of all participating units to obtain the theoretical adjustment rate of the power grid, wherein the adjustment rate setpoint of a unit is the product of the rated active power of the unit and the percentage of the adjustment rate of the unit.

12. The power grid ACE control system based on dynamic calculation of regulation rate as described in claim 7, characterized in that, The execution module is used to adjust the number of generating units participating in grid ACE regulation according to the grid regulation rate increment, including: When the grid regulation rate increment is positive, the number of generating units participating in grid ACE regulation increases. When the grid regulation rate increment is negative, the number of generating units participating in grid ACE regulation is reduced.

13. A computer device, characterized in that, The system includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, it implements a power grid ACE control method based on dynamic calculation of the regulation rate. The method includes the following steps: obtaining the duration after the power grid area control deviation ACE crosses zero and the remaining adjustment time of the ACE, wherein the remaining adjustment time of the ACE is obtained according to the ratio of the absolute value of the real-time ACE value to the real-time regulation rate of the power grid. Based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, and the remaining adjustment time of the ACE, a judgment result is obtained on whether to adjust the grid regulation rate. If adjustment is required, the grid regulation rate increment is obtained based on the real-time grid regulation rate and the theoretical grid regulation rate, including: weighting the difference between the real-time grid regulation rate and the theoretical grid regulation rate to obtain the grid regulation rate increment. The larger the difference between the theoretical grid regulation rate and the real-time grid regulation rate, the larger the weighting coefficient. The number of generating units participating in grid ACE regulation is adjusted according to the grid regulation rate increment.

14. A computer device as described in claim 13, characterized in that, The step of obtaining the duration after the ACE crosses zero in the power grid includes: When ACE crosses zero, record the duration after the zero crossing until the next time ACE crosses zero.

15. A computer device as described in claim 13, characterized in that, The real-time regulation rate of the power grid is obtained based on the ratio of the change amplitude of ACE to the duration after ACE crosses zero.

16. A computer device as described in claim 13, characterized in that, The step of determining whether to adjust the grid regulation rate based on the difference between the ACE zero-crossing time limit and the duration after zero-crossing, and the remaining adjustment time of the ACE, includes: like In this case, there is no need to adjust the power grid regulation rate; like If so, the power grid regulation rate needs to be adjusted; Among them, T R T represents the remaining adjustment time for ACE. B T is the ACE zero-crossing time limit. D The duration after ACE crosses zero.

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