A centralized frequency control method and system for new energy field clusters

Abstract

The present invention discloses a centralized frequency control method and system for a new energy cluster. In the event of an expected fault disturbance, the present invention sends a removal command to a safety and stability emergency control master station to remove the new energy according to the emergency control strategy. In the event of a small frequency difference in the system caused by a fault disturbance other than the expected fault, the present invention sends an active power continuous adjustment command to the centralized frequency control master station for the new energy cluster to continuously adjust the active power of the new energy. In the event of a large frequency difference in the system caused by a fault disturbance other than the expected fault, the present invention sends an active power continuous adjustment function locking command to the centralized frequency control master station for the new energy cluster. By removing or connecting new energy, the centralized frequency control of the new energy cluster is performed in rounds, which is beneficial to the rapid recovery of frequency under large frequency difference, and is beneficial to improving the frequency steady state and transient fluctuation caused by the uncertainty of new energy, and provides technical support for the safe and stable frequency control of the intensive connection of new energy to the power grid.

Description

Technical Field

[0001] The present invention relates to a centralized frequency control method and system for a new energy field, belonging to the technical field of power systems and automation thereof. Background Art

[0002] With the promotion and application of ultra-high voltage direct current (UHVDC) and the increasing proportion of renewable energy power generation, a large number of synchronous generator sets in the transmitting and receiving power grids have been replaced by renewable energy sources, significantly reducing the grid's frequency regulation capabilities. Faults such as AC short circuits, DC commutation failures, and lockouts can cause large-scale disconnection of renewable energy units from the grid or loss of DC power, resulting in large-scale unbalanced power in the system. This poses severe challenges to grid transient frequency security technologies. On the one hand, renewable energy units generally do not participate in grid frequency regulation. As their penetration rate continues to increase, the uncertainty and volatility of renewable energy generation itself also increase the difficulty of controlling the stable frequency of the power system. On the other hand, different renewable energy units have different capabilities to withstand high and low frequencies. Distributed high-frequency disconnection or disconnection will cause new disturbances to the transient frequency characteristics of the grid, which is not conducive to the restoration of transient frequency stability. Therefore, a centralized frequency control method for renewable energy clusters is needed. Summary of the Invention

[0003] The present invention provides a new energy field cluster centralized frequency control method and system, which solves the problems disclosed in the background technology.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A centralized frequency control method for a new energy field cluster, comprising:

[0006] In response to the occurrence of an anticipated fault disturbance, a removal command is sent to the safety, stability and emergency control master station to instruct the safety, stability and emergency control master station to remove a preset capacity of new energy;

[0007] In response to a deviation in the grid frequency caused by an unexpected fault disturbance, the deviation being within a first preset range and the duration of the deviation being greater than a first preset time, sending an active power continuous adjustment command to the centralized frequency control master station of the new energy cluster, for instructing the centralized frequency control master station of the new energy cluster to continuously adjust the active power of the new energy; wherein the absolute value of the limit value of the first preset range is not greater than a threshold value A0, and the new energy for which active power adjustment is performed is a new energy that can be continuously adjusted and controlled;

[0008] In response to a deviation in the grid frequency due to an unexpected fault disturbance, the deviation is within a second preset range and the time of the deviation is greater than the second preset time, a command to lock the active power continuous regulation function is sent to the centralized frequency control master station of the new energy field cluster, so as to command the centralized frequency control master station of the new energy field cluster to lock the active power continuous regulation function of the new energy, and cut off or connect the new energy in batches according to the preset rounds; wherein, the absolute value of the limit value of the second preset range is greater than the threshold value A0.

[0009] The first preset range includes (A1, A0] and [-A0, -A1);

[0010] In response to a grid frequency deviation Δf due to an unexpected fault disturbance, A1<Δf≤A0, and the duration of the deviation is greater than a first preset time, sending an active power continuous adjustment command to the centralized frequency control master station of the new energy cluster to instruct the centralized frequency control master station of the new energy cluster to reduce the active power of the new energy;

[0011] In response to a grid frequency deviation Δf, -A0≤Δf<-A1, caused by an unexpected fault disturbance, and the time of the deviation is greater than a first preset time, an adjustment command is sent to the new energy cluster centralized frequency control master station to instruct the new energy cluster centralized frequency control master station to increase the new energy active power.

[0012] The formula for reducing the active power of new energy is:

[0013]

[0014] The formula for the added new energy active power is:

[0015]

[0016] in, To reduce the active power of new energy, To increase the new energy active power, The maximum renewable energy active power output that can be reduced for all renewable energy groups that can be continuously adjusted and controlled. is the maximum increase in the active power output of all renewable energy groups that can be continuously adjusted and controlled, Δf a is the deviation between the transient real-time frequency of the power grid and the reference frequency, and γ is the natural frequency characteristic coefficient of the power grid system.

[0017] The second preset range includes (A0, A2] and [-A2, -A0);

[0018] In response to a grid frequency deviation Δf, A0<Δf≤A2, caused by an unexpected fault disturbance, and the duration of the deviation is greater than a second preset time, sending a blocking active power continuous regulation function command to the centralized frequency control master station of the new energy cluster, so as to instruct the centralized frequency control master station of the new energy cluster to block the active power continuous regulation function of the new energy and to cut off the new energy in batches according to preset rounds;

[0019] In response to a grid frequency deviation Δf, -A2≤Δf<-A0 caused by an unexpected fault disturbance, and the time of the deviation is greater than a second preset time, a command to lock the active power continuous regulation function is sent to the centralized frequency control master station of the new energy field cluster, so as to command the centralized frequency control master station of the new energy field cluster to lock the active power continuous regulation function of the new energy and connect the new energy in batches according to the preset rounds.

[0020] The formula for the active capacity of new energy removed is:

[0021]

[0022] The formula for the active capacity of connected new energy is:

[0023]

[0024] in, The active capacity of new energy to be removed, is the active capacity of the connected new energy, γ is the natural frequency characteristic coefficient of the power grid system, is the real-time total active power of all removable new energy field groups, It is the real-time total active power of all accessible new energy field groups.

[0025] A new energy field cluster centralized frequency control system, comprising:

[0026] The control module in the expected fault disturbance scenario: in response to the occurrence of the expected fault disturbance, sends a removal command to the safety, stability and emergency control master station to instruct the safety, stability and emergency control master station to remove the preset capacity of new energy;

[0027] The control module in the small frequency difference disturbance scenario: in response to a deviation in the grid frequency caused by an unexpected fault disturbance, the deviation is within a first preset range, and the duration of the deviation is greater than a first preset time, sends an active power continuous adjustment command to the centralized frequency control master station of the new energy cluster, instructing the centralized frequency control master station of the new energy cluster to continuously adjust the active power of the new energy; wherein the absolute value of the limit value of the first preset range is not greater than the threshold value A0, and the new energy for which active power adjustment is performed is a new energy that can be continuously adjusted and controlled;

[0028] The control module in the large frequency difference disturbance scenario: in response to the deviation of the grid frequency due to an unexpected fault disturbance, the deviation is within the second preset range and the time of the deviation is greater than the second preset time, a command for locking the active power continuous regulation function is sent to the centralized frequency control master station of the new energy field cluster to command the centralized frequency control master station of the new energy field cluster to lock the active power continuous regulation function of the new energy, and cut off or connect the new energy in batches according to the preset rounds; wherein, the absolute value of the limit value of the second preset range is greater than the threshold A0.

[0029] The first preset range includes (A1, A0] and [-A0, -A1);

[0030] The control module in the small frequency difference disturbance scenario includes a reduction control module in the small frequency difference disturbance scenario and an increase control module in the small frequency difference disturbance scenario;

[0031] A reduction control module in a small frequency difference disturbance scenario: in response to a grid frequency deviation Δf due to an unexpected fault disturbance, A1 < Δf ≤ A0, and the duration of the deviation is greater than a first preset time, sends an adjustment command to the centralized frequency control master station of the new energy cluster to instruct the centralized frequency control master station of the new energy cluster to reduce the active power of the new energy;

[0032] Adding control module in small frequency difference disturbance scenario: in response to the grid frequency deviation Δf caused by unexpected fault disturbance, -A0≤Δf<-A1 and the deviation time is greater than the first preset time, sending active power continuous adjustment command to the centralized frequency control master station of the new energy field cluster to command the centralized frequency control master station of the new energy field cluster to increase the new energy active power.

[0033] In the reduction control module under the small frequency difference disturbance scenario, the formula for reducing the new energy active power is:

[0034]

[0035] In the additional control module under the small frequency difference disturbance scenario, the formula for the added new energy active power is:

[0036]

[0037] in, To reduce the active power of new energy, To increase the new energy active power, The maximum renewable energy active power output that can be reduced for all renewable energy groups that can be continuously adjusted and controlled. is the maximum increase in the active power output of all renewable energy groups that can be continuously adjusted and controlled, Δf a is the deviation between the transient real-time frequency of the power grid and the reference frequency, and γ is the natural frequency characteristic coefficient of the power grid system.

[0038] The second preset range includes (A0, A2] and [-A2, -A0);

[0039] The control module in the large frequency difference disturbance scenario includes a removal control module in the large frequency difference disturbance scenario and an access control module in the large frequency difference disturbance scenario;

[0040] The removal control module in the large frequency difference disturbance scenario: in response to a grid frequency deviation Δf caused by an unexpected fault disturbance, A0<Δf≤A2, and the deviation duration is greater than a second preset time, sends an active power continuous regulation function blocking command to the centralized frequency control master station of the new energy cluster, instructing the centralized frequency control master station of the new energy cluster to block the active power continuous regulation function of the new energy and remove the new energy in batches according to preset rounds;

[0041] Access control module in large frequency difference disturbance scenario: in response to the grid frequency deviation Δf caused by unexpected fault disturbance, -A2≤Δf<-A0 and the deviation time is greater than the second preset time, a command for locking the active power continuous regulation function is sent to the centralized frequency control master station of the new energy field cluster to command the centralized frequency control master station of the new energy field cluster to lock the active power continuous regulation function of the new energy and access the new energy in batches according to the preset rounds.

[0042] In the removal control module under the large frequency difference disturbance scenario, the formula for removing the new energy active capacity is:

[0043]

[0044] In the access control module under the large frequency difference disturbance scenario, the formula for accessing the new energy active capacity is:

[0045]

[0046] in, The active capacity of new energy to be removed, is the active capacity of the connected new energy, γ is the natural frequency characteristic coefficient of the power grid system, is the real-time total active power of all removable new energy field groups, It is the real-time total active power of all accessible new energy field groups.

[0047] A computer-readable storage medium storing one or more programs, wherein the one or more programs include instructions that, when executed by a computing device, cause the computing device to perform a new energy plant cluster centralized frequency control method.

[0048] A computing device includes one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing a new energy plant cluster centralized frequency control method.

[0049] The beneficial effects achieved by the present invention are as follows: in the scenario of an expected fault disturbance, the present invention sends a cut-off command to the safety and stability emergency control master station to cut off the new energy; in the scenario of a small frequency difference of the system caused by a fault disturbance other than the expected fault (that is, the deviation is within the first preset range and the time of the deviation is greater than the first preset time), the present invention sends an active power continuous adjustment command to the new energy field cluster centralized frequency control master station, and continuously adjusts the active power of the new energy to achieve smooth recovery of the frequency under small frequency difference; in the scenario of a large frequency difference of the system caused by a fault disturbance other than the expected fault (that is, the deviation is within the second preset range and the time of the deviation is greater than the second preset time), the present invention sends an active power continuous adjustment function locking command to the new energy field cluster centralized frequency control master station, and performs centralized frequency control of the new energy field cluster in rounds by cutting off or connecting new energy, which is conducive to rapid recovery of frequency under large frequency difference; the present invention proposes corresponding methods for centralized participation of new energy in frequency control under three different frequency disturbance scenarios, which is conducive to improving the frequency steady state and transient fluctuations caused by the uncertainty of new energy, and provides technical support for frequency safety and stability control of intensive access of new energy to the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 The flowchart of the centralized frequency control method for the new energy field cluster is as follows;

[0051] Figure 2 This is the structural block diagram of the new energy field group control. DETAILED DESCRIPTION

[0052] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0053] like Figure 1 As shown, a centralized frequency control method for a new energy field cluster includes:

[0054] Step 1: In response to the occurrence of a predicted fault disturbance, a removal command is sent to the safety, stability and emergency control master station to instruct the safety, stability and emergency control master station to remove a preset capacity of new energy;

[0055] Step 2: In response to a small frequency difference disturbance causing a deviation in the grid frequency due to an unexpected fault disturbance, the deviation being within a first preset range and the duration of the deviation being greater than the first preset time, a command for continuous active power regulation is sent to the centralized frequency control master station of the new energy cluster, commanding the centralized frequency control master station of the new energy cluster to continuously regulate the active power of the new energy; wherein the absolute value of the limit value of the first preset range is not greater than a threshold value A0, and the new energy for which active power regulation is performed is a continuously adjustable and controllable new energy;

[0056] Step 3: In response to a large frequency difference disturbance causing a deviation in the grid frequency due to an unexpected fault disturbance, the deviation is within a second preset range, and the time of the deviation is greater than the second preset time, a command for locking the active power continuous regulation function is sent to the centralized frequency control master station of the new energy cluster to command the centralized frequency control master station of the new energy cluster to lock the active power continuous regulation function of the new energy, and to cut off or connect the new energy in batches according to the preset rounds; wherein the absolute value of the limit value of the second preset range is greater than the threshold value A0.

[0057] In the scenario of an expected fault disturbance, the above method sends a cut-off command to the safety and stability emergency control master station to cut off the new energy. In the scenario of a small frequency difference in the system caused by a fault disturbance other than the expected fault (i.e., the deviation is within the first preset range and the time of the deviation is greater than the first preset time), the method sends an active power continuous adjustment command to the new energy cluster centralized frequency control master station to continuously adjust the new energy active power to achieve smooth frequency recovery under small frequency difference. In the scenario of a large frequency difference in the system caused by a fault disturbance other than the expected fault (i.e., the deviation is within the second preset range and the time of the deviation is greater than the second preset time), the method sends an active power continuous adjustment function locking command to the new energy cluster centralized frequency control master station to cut off or connect new energy and perform centralized frequency control of the new energy cluster in rounds, which is conducive to rapid frequency recovery under large frequency difference. For three different frequency disturbance scenarios, corresponding methods for centralized participation of new energy in frequency control are proposed, which are conducive to improving the frequency steady state and transient fluctuations caused by the uncertainty of new energy, and provide technical support for frequency safety and stability control of intensive new energy access to the power grid.

[0058] Since some of the controlled new energy plant clusters are controlled by both emergency control and correction control, a unified coordination control master station can be set up to coordinate the control rights of the controlled objects. The above method can be loaded into the coordination control master station. The connection relationship between the coordination control master station and the safety and stability emergency control master station, the new energy plant cluster centralized frequency control master station and the new energy plant cluster control substation is as follows: Figure 2 shown.

[0059] The new energy plant cluster control substation will collect real-time information such as the actual active power output, adjustable capacity, and operating status of the new energy plant, and send it to the safety and stability emergency control master station and the new energy plant cluster centralized frequency control master station respectively.

[0060] In terms of control scenarios, it is divided into scenarios of anticipated fault disturbance, small frequency difference disturbance and large frequency difference disturbance; in the scenario of anticipated fault disturbance, the control right of the new energy cluster is the safety and stability emergency control master station, which takes emergency new energy removal actions according to the preset strategy table; in the scenario of small frequency difference disturbance, since the frequency deviation is small, the rapid adjustment capability of the new energy inverter can be used to centrally and continuously adjust the output of the new energy cluster, and its output is limited by the maximum continuous adjustment capability of the new energy cluster; in the scenario of large frequency difference disturbance, since the frequency deviation is large, it is necessary to quickly remove or connect new energy in a centralized manner in rounds to quickly restore the frequency, and its rapid removal and connection capacity is limited by the maximum removal or connection capacity of the new energy cluster.

[0061] Therefore, when a predicted fault disturbance occurs, a removal command is sent to the safety, stability, and emergency control master station, instructing it to remove a preset capacity of renewable energy according to the emergency control strategy. That is, the coordinated control master station sends a removal command to the safety, stability, and emergency control master station. The safety, stability, and emergency control master station then sends a new energy removal command to the connected renewable energy cluster control substations according to the pre-set emergency control strategy. The new energy cluster control substations remove the specified capacity of renewable energy. The coordinated control master station removes the removed renewable energy cluster from the candidate control objects and sends the command to the new energy centralized frequency control master station.

[0062] When an unexpected fault disturbance causes a deviation in the grid frequency, the deviation is within a first preset range, and the duration of the deviation is greater than the first preset time, i.e., a small frequency difference disturbance, a command for continuous active power adjustment is sent to the centralized frequency control master station of the new energy cluster, instructing the centralized frequency control master station of the new energy cluster to continuously adjust the active power of the new energy, wherein the new energy being adjusted is a continuously adjustable and controllable new energy. That is, the coordinated control master station instructs the centralized frequency control master station of the new energy cluster to continuously adjust the active power of the new energy, and the centralized frequency control master station of the new energy cluster issues a control instruction to the substation where the continuously adjustable and controllable new energy is located. The new energy cluster control substation then performs continuous control of the active power of the new energy according to a pre-set strategy.

[0063] The absolute value of the limit of the above-mentioned first preset range is not greater than the threshold A0, specifically including (A1, A0] and [-A0, -A1), A1 can be 0.3HZ, A0 can be 0.5HZ, and the deviation is the deviation value between the transient frequency value of the power grid and the reference frequency 50Hz.

[0064] Therefore, the first preset range can be expressed as:

[0065]

[0066]

[0067] Where f is the transient frequency value of the power grid, Δf is the deviation between the transient frequency value of the power grid and the reference frequency of 50 Hz;

[0068] When the grid frequency deviates Δf due to an unexpected fault disturbance, 0.3Hz<Δf≤0.5Hz and the deviation lasts longer than the first preset time t s , sends an active power continuous adjustment command to the new energy field cluster centralized frequency control master station to instruct the new energy field cluster centralized frequency control master station to reduce the new energy active power. That is, the coordination control master station instructs the new energy field cluster centralized frequency control master station to continuously adjust the new energy active power, and the new energy field cluster centralized frequency control master station sends a command to reduce the new energy active power output to the substation where the new energy source that can be connected to the continuously adjustable control is located; Among them,

[0069] The formula for reducing the usefulness of new energy can be expressed as:

[0070]

[0071] in, To reduce the active power of new energy, is the maximum renewable energy active power output that can be reduced by all renewable energy groups that can be continuously adjusted and controlled, Δf a is the deviation between the transient real-time frequency of the power grid and the reference frequency of 50 Hz, and γ is the natural frequency characteristic coefficient of the power grid system, which represents the ability of the system frequency to change under the combined effect of the system prime mover speed regulator regulation characteristics and system load regulation effect when the system active power changes.

[0072] When the grid frequency deviates Δf due to an unexpected fault disturbance, -0.5Hz≤Δf<-0.3Hz and the deviation lasts longer than the first preset time t s , sends an active power continuous adjustment command to the new energy field cluster centralized frequency control master station to instruct the new energy field cluster centralized frequency control master station to increase the new energy active power. That is, the coordination control master station instructs the new energy field cluster centralized frequency control master station to continuously adjust the new energy active power, and the new energy field cluster centralized frequency control master station sends a command to increase the new energy active power output to the substation where the new energy source that can be connected to the continuously adjustable control is located; Among them,

[0073] The added new energy useful formula can be expressed as:

[0074]

[0075] in, To increase the new energy active power, It is the maximum increase in the active power output of new energy sources that can be continuously adjusted and controlled by all new energy field groups.

[0076] When an unexpected fault disturbance causes the grid frequency to deviate, the deviation is within a second preset range, and the duration of the deviation is greater than a second preset time, i.e., a large frequency difference disturbance occurs, a command to lock the active power continuous regulation function is sent to the centralized frequency control master station of the new energy cluster, instructing the centralized frequency control master station of the new energy cluster to lock the continuous regulation function of the active power of the new energy, and to remove or connect new energy in batches according to preset cycles. That is, the coordinated control master station instructs the centralized frequency control master station of the new energy cluster to lock the continuous regulation function of the active power of the new energy, and to set all connected new energy cluster control substations to the discontinuous regulation control function, and to remove or connect new energy in batches according to the preset cycles in response to changes in the system frequency, so as to restore the frequency to normal.

[0077] As mentioned above, the absolute value of the limit of the second preset range is greater than the threshold A0, specifically including (A0, A2] and [-A2, -A0), A2 can be 1.0HZ, so the second preset range can be expressed by the formula:

[0078]

[0079]

[0080] Therefore, when the grid frequency deviates Δf due to an unexpected fault disturbance, 0.5 Hz < Δf ≤ 1.0 Hz and the time of the deviation is greater than the second preset time t b , sends an active power continuous regulation function blocking command to the new energy field cluster centralized frequency control master station, which is used to instruct the new energy field cluster centralized frequency control master station to block the new energy active power regulation function, and cut off the new energy in batches according to the preset rounds. That is, the coordination control master station instructs the new energy field cluster centralized frequency control master station to block the new energy active power continuous regulation function, and sets all connected new energy field cluster control substations to the discontinuous regulation control function, and cuts off the new energy in batches according to the second round; Among them,

[0081] The active capacity of the removed new energy can be expressed as follows:

[0082]

[0083] in, The active capacity of new energy to be removed, It is the real-time total active power of all removable new energy field groups.

[0084] When the grid frequency deviates Δf due to an unexpected fault disturbance, -1.0 Hz ≤ Δf < -0.5 Hz, and the deviation lasts longer than the second preset time t b, sends an active power continuous regulation function blocking command to the new energy cluster centralized frequency control master station, which is used to instruct the new energy cluster centralized frequency control master station to block the new energy active power regulation function, and connect new energy in batches according to the preset rounds. That is, the coordination control master station instructs the new energy cluster centralized frequency control master station to block the new energy active power continuous regulation function, and sets all connected new energy cluster control substations to discontinuous regulation control function, according to the second round of access to new energy that has not been connected to the grid; Among them,

[0085] The active capacity of the connected new energy can be expressed as follows:

[0086]

[0087] in, For the active capacity of new energy connected, It is the real-time total active power of all accessible new energy field groups.

[0088] The above method comprehensively considers the positioning and control targets of new energy units in participating in the grid frequency emergency control and frequency correction control, drives different new energy control objects and control means according to different fault disturbance events and grid state trajectories, and adopts a new energy centralized frequency control method at the same time. The active power control of new energy of different types and different operating states is uniformly managed and controlled according to the frequency safety and stability targets, combining the dual advantages of the rapidity of frequency emergency control triggered by fault disturbance events and the accuracy of frequency correction control triggered by frequency state trajectories under large and small disturbances. It is conducive to improving the frequency steady state and transient fluctuations caused by the uncertainty of new energy, and providing technical support for the frequency safety and stability control of intensive new energy access to the grid.

[0089] Based on the same technical solution, the present invention also discloses a software system of the above method, namely a new energy field cluster centralized frequency control system, comprising:

[0090] Control module in the expected fault disturbance scenario: In response to the occurrence of the expected fault disturbance, a removal command is sent to the safety, stability and emergency control master station to instruct the safety, stability and emergency control master station to remove the preset capacity of new energy.

[0091] The control module in the small frequency difference disturbance scenario: in response to a deviation in the grid frequency caused by an unexpected fault disturbance, the deviation is within a first preset range and the time of the deviation is greater than the first preset time, a continuous active power adjustment command is sent to the centralized frequency control master station of the new energy field cluster to command the centralized frequency control master station of the new energy field cluster to continuously adjust the active power of the new energy; wherein, the absolute value of the limit value of the first preset range is not greater than the threshold value A0, and the new energy for which active power adjustment is performed is a new energy that can be continuously adjusted and controlled.

[0092] The first preset range includes (A1, A0] and [-A0, -A1);

[0093] The control module in the small frequency difference disturbance scenario includes a reduction control module in the small frequency difference disturbance scenario and an increase control module in the small frequency difference disturbance scenario;

[0094] A reduction control module in a small frequency difference disturbance scenario: in response to a grid frequency deviation Δf due to an unexpected fault disturbance, A1 < Δf ≤ A0, and the duration of the deviation is greater than a first preset time, sends an active power continuous adjustment command to the centralized frequency control master station of the new energy cluster to instruct the centralized frequency control master station of the new energy cluster to reduce the active power of the new energy;

[0095] Adding control module in small frequency difference disturbance scenario: in response to the grid frequency deviation Δf caused by unexpected fault disturbance, -A0≤Δf<-A1 and the deviation time is greater than the first preset time, sending active power continuous adjustment command to the centralized frequency control master station of the new energy field cluster to command the centralized frequency control master station of the new energy field cluster to increase the new energy active power.

[0096] In the reduction control module under the small frequency difference disturbance scenario, the formula for reducing the new energy active power is:

[0097]

[0098] In the additional control module under the small frequency difference disturbance scenario, the formula for the added new energy active power is:

[0099]

[0100] in, To reduce the active power of new energy, To increase the new energy active power, The maximum renewable energy active power output that can be reduced for all renewable energy groups that can be continuously adjusted and controlled. is the maximum increase in the active power output of all renewable energy groups that can be continuously adjusted and controlled, Δf a is the deviation between the transient real-time frequency of the power grid and the reference frequency, and γ is the natural frequency characteristic coefficient of the power grid system.

[0101] The control module in the large frequency difference disturbance scenario: in response to the deviation of the grid frequency due to an unexpected fault disturbance, the deviation is within the second preset range and the time of the deviation is greater than the second preset time, a command for locking the active power continuous regulation function is sent to the centralized frequency control master station of the new energy field cluster to command the centralized frequency control master station of the new energy field cluster to lock the active power regulation function of the new energy, and cut off or connect the new energy in batches according to the preset rounds; wherein, the absolute value of the limit value of the second preset range is greater than the threshold A0.

[0102] The second preset range includes (A0, A2] and [-A2, -A0);

[0103] The control module in the large frequency difference disturbance scenario includes a removal control module in the large frequency difference disturbance scenario and an access control module in the large frequency difference disturbance scenario;

[0104] The removal control module in the large frequency difference disturbance scenario: in response to a grid frequency deviation Δf caused by an unexpected fault disturbance, A0<Δf≤A2, and the deviation duration is greater than a second preset time, sends an active power continuous regulation function blocking command to the centralized frequency control master station of the new energy cluster, instructing the centralized frequency control master station of the new energy cluster to block the active power regulation function of the new energy and remove the new energy in batches according to preset rounds;

[0105] Access control module in large frequency difference disturbance scenario: in response to the grid frequency deviation Δf caused by unexpected fault disturbance, -A2≤Δf<-A0 and the deviation time is greater than the second preset time, a command for locking the active power continuous regulation function is sent to the centralized frequency control master station of the new energy field cluster to command the centralized frequency control master station of the new energy field cluster to lock the active power regulation function of the new energy and access the new energy in batches according to the preset rounds.

[0106] In the removal control module under the large frequency difference disturbance scenario, the formula for removing the new energy active capacity is:

[0107]

[0108] In the access control module under the large frequency difference disturbance scenario, the formula for accessing the new energy active capacity is:

[0109]

[0110] in, The active capacity of new energy to be removed, is the active capacity of the connected new energy, γ is the natural frequency characteristic coefficient of the power grid system, is the real-time total active power of all removable new energy field groups, It is the real-time total active power of all accessible new energy field groups.

[0111] Based on the same technical solution, the present invention also discloses a computer-readable storage medium storing one or more programs, wherein the one or more programs include instructions, which, when executed by a computing device, enable the computing device to perform a new energy field cluster centralized frequency control method.

[0112] Based on the same technical solution, the present invention also discloses a computing device, including one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing a new energy field cluster centralized frequency control method.

[0113] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0114] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0115] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0116] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0117] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A centralized frequency control method for a new energy field cluster, characterized in that: include: In response to the occurrence of an anticipated fault disturbance, a removal command is sent to the safety, stability and emergency control master station to instruct the safety, stability and emergency control master station to remove a preset capacity of new energy; In response to a deviation in the grid frequency caused by an unexpected fault disturbance, the deviation being within a first preset range and the duration of the deviation being greater than a first preset time, sending an active power continuous adjustment command to the centralized frequency control master station of the new energy cluster, for instructing the centralized frequency control master station of the new energy cluster to continuously adjust the active power of the new energy; wherein the absolute value of the limit value of the first preset range is not greater than a threshold value A0, and the new energy for which active power adjustment is performed is a new energy that can be continuously adjusted and controlled; In response to a deviation in the grid frequency caused by an unexpected fault disturbance, the deviation being within a second preset range and the duration of the deviation being greater than a second preset time, a command to block the continuous active power regulation function is sent to the centralized frequency control master station of the new energy cluster, instructing the centralized frequency control master station of the new energy cluster to block the continuous active power regulation function of the new energy and to cut off or connect the new energy in batches according to preset rounds; wherein the absolute value of the limit value of the second preset range is greater than the threshold value A0; The first preset range includes (A1, A0] and [-A0, -A1); In response to a deviation Δf, A1 < Δf ≤ A0 in the grid frequency caused by an unexpected fault disturbance, and the time of the deviation is greater than a first preset time, an active power continuous adjustment command is sent to the new energy field cluster centralized frequency control master station to instruct the new energy field cluster centralized frequency control master station to reduce the new energy active power; in response to a deviation Δf, -A0 ≤ Δf < -A1 in the grid frequency caused by an unexpected fault disturbance, and the time of the deviation is greater than a first preset time, an adjustment command is sent to the new energy field cluster centralized frequency control master station to instruct the new energy field cluster centralized frequency control master station to increase the new energy active power; Among them, the formula for reducing the active power of new energy is: The formula for the added new energy active power is: in, To reduce the active power of new energy, To increase the new energy active power, The maximum renewable energy active power output that can be reduced for all renewable energy groups that can be continuously adjusted and controlled. is the maximum increase in the active power output of all renewable energy groups that can be continuously adjusted and controlled, Δf a is the deviation between the transient real-time frequency of the power grid and the reference frequency, and γ is the natural frequency characteristic coefficient of the power grid system.

2. A centralized frequency control method for a new energy field cluster according to claim 1, characterized in that: The second preset range includes (A0, A2] and [-A2, -A0); In response to a grid frequency deviation Δf, A0<Δf≤A2, caused by an unexpected fault disturbance, and the duration of the deviation is greater than a second preset time, sending a blocking active power continuous regulation function command to the centralized frequency control master station of the new energy cluster, so as to instruct the centralized frequency control master station of the new energy cluster to block the active power continuous regulation function of the new energy and to cut off the new energy in batches according to preset rounds; In response to a grid frequency deviation Δf, -A2≤Δf<-A0 caused by an unexpected fault disturbance, and the time of the deviation is greater than a second preset time, a command to lock the active power continuous regulation function is sent to the centralized frequency control master station of the new energy field cluster, so as to command the centralized frequency control master station of the new energy field cluster to lock the active power continuous regulation function of the new energy and connect the new energy in batches according to the preset rounds.

3. A centralized frequency control method for a new energy field cluster according to claim 2, characterized in that: The formula for the active capacity of new energy removed is: The formula for the active capacity of connected new energy is: in, The active capacity of new energy to be removed, For the active capacity of new energy connected, is the real-time total active power of all removable new energy field groups, It is the real-time total active power of all accessible new energy field groups.

4. A new energy field centralized frequency control system, characterized in that: include: The control module in the expected fault disturbance scenario: in response to the occurrence of the expected fault disturbance, sends a removal command to the safety, stability and emergency control master station to instruct the safety, stability and emergency control master station to remove the preset capacity of new energy; The control module in the small frequency difference disturbance scenario: in response to a deviation in the grid frequency caused by an unexpected fault disturbance, the deviation is within a first preset range, and the duration of the deviation is greater than a first preset time, sends an active power continuous adjustment command to the centralized frequency control master station of the new energy cluster, instructing the centralized frequency control master station of the new energy cluster to continuously adjust the active power of the new energy; wherein the absolute value of the limit value of the first preset range is not greater than the threshold value A0, and the new energy for which active power adjustment is performed is a new energy that can be continuously adjusted and controlled; The control module in the large frequency difference disturbance scenario: in response to a deviation in the grid frequency caused by an unexpected fault disturbance, the deviation is within a second preset range, and the duration of the deviation is greater than the second preset time, sends a command to lock the active power continuous regulation function to the centralized frequency control master station of the new energy cluster, instructing the centralized frequency control master station of the new energy cluster to lock the active power continuous regulation function of the new energy and cut off or connect the new energy in batches according to the preset rounds; wherein the absolute value of the limit value of the second preset range is greater than the threshold value A0; The first preset range in the control module in the above-mentioned small frequency difference disturbance scenario includes (A1, A0] and [-A0, -A1); The control module in the small frequency difference disturbance scenario includes a reduction control module in the small frequency difference disturbance scenario and an increase control module in the small frequency difference disturbance scenario; A reduction control module in a small frequency difference disturbance scenario: in response to a grid frequency deviation Δf due to an unexpected fault disturbance, A1 < Δf ≤ A0, and the duration of the deviation is greater than a first preset time, sends an active power continuous adjustment command to the centralized frequency control master station of the new energy cluster to instruct the centralized frequency control master station of the new energy cluster to reduce the active power of the new energy; The increase control module in the small frequency difference disturbance scenario: in response to a grid frequency deviation Δf caused by an unexpected fault disturbance, where -A0≤Δf<-A1, and the duration of the deviation is greater than a first preset time, sends an adjustment command to the centralized frequency control master station of the new energy cluster to instruct the centralized frequency control master station of the new energy cluster to increase the active power of new energy; Among them, in the reduction control module under the small frequency difference disturbance scenario, the formula for reducing the new energy active power is: In the additional control module under the small frequency difference disturbance scenario, the formula for the added new energy active power is: in, To reduce the active power of new energy, To increase the new energy active power, The maximum renewable energy active power output that can be reduced for all renewable energy groups that can be continuously adjusted and controlled. is the maximum increase in the active power output of all renewable energy groups that can be continuously adjusted and controlled, Δf a is the deviation between the transient real-time frequency of the power grid and the reference frequency, and γ is the natural frequency characteristic coefficient of the power grid system.

5. The centralized frequency control system of a new energy field cluster according to claim 4, characterized in that: The second preset range includes (A0, A2] and [-A2, -A0); The control module in the large frequency difference disturbance scenario includes a removal control module in the large frequency difference disturbance scenario and an access control module in the large frequency difference disturbance scenario; The removal control module in the large frequency difference disturbance scenario: in response to a grid frequency deviation Δf caused by an unexpected fault disturbance, A0<Δf≤A2, and the deviation duration is greater than a second preset time, sends an active power continuous regulation function blocking command to the centralized frequency control master station of the new energy cluster, instructing the centralized frequency control master station of the new energy cluster to block the active power continuous regulation function of the new energy and remove the new energy in batches according to preset rounds; Access control module in large frequency difference disturbance scenario: in response to the grid frequency deviation Δf caused by unexpected fault disturbance, -A2≤Δf<-A0 and the deviation time is greater than the second preset time, a command to lock the active power continuous regulation function is sent to the centralized frequency control master station of the new energy field cluster to command the centralized frequency control master station of the new energy field cluster to lock the active power continuous regulation function of the new energy and access the new energy in batches according to the preset rounds.

6. The centralized frequency control system of a new energy field cluster according to claim 5, characterized in that: In the removal control module under the large frequency difference disturbance scenario, the formula for removing the new energy active capacity is: In the access control module under the large frequency difference disturbance scenario, the formula for accessing the new energy active capacity is: in, The active capacity of new energy to be removed, For the active capacity of new energy connected, is the real-time total active power of all removable new energy field groups, It is the real-time total active power of all accessible new energy field groups.

7. A computer-readable storage medium storing one or more programs, characterized in that: The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any one of the methods according to claims 1 to 3.

8. A computing device, characterized in that include: One or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods according to claims 1 to 3.

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