CN117498421A - Power control method and device for HVDC transmission system and computer equipment - Google Patents
Power control method and device for HVDC transmission system and computer equipment Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00004—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the power network being locally controlled
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Abstract
The application relates to a power control method, a device, computer equipment, a storage medium and a computer program product of a high-voltage direct-current transmission system, and relates to the technical field of high-voltage direct-current transmission fault treatment. The method comprises the steps of obtaining the working condition state of a high-voltage direct-current transmission system; determining a power return triggering condition for the high-voltage direct-current transmission system according to the working condition state; determining a power reference value updating instruction aiming at the current direct current power reference value according to the working condition state; and under the condition that the current direct current power reference value meets the power return triggering condition, updating the current direct current power reference value according to the power reference value updating instruction, and executing a power return function by utilizing the updated current direct current power reference value so as to adjust the power of the high-voltage direct current power transmission system. By adopting the method, the accuracy of direct current power control in the high-voltage direct current transmission system can be improved.
Description
Technical Field
The present invention relates to the field of fault handling in hvdc transmission, and in particular, to a power control method, apparatus, computer device, storage medium and computer program product for hvdc transmission systems.
Background
The extra-high voltage direct current transmission technology has the advantages of large transmission capacity, high voltage grade, low manufacturing cost, low operation loss and mature and reliable technology, and the transmission mode is widely adopted due to good technical economy when the electric energy is transmitted in a large capacity and a long distance.
The reactive power control function (RPC, reactive Power Control) of the direct current control system in the ultra-high voltage direct current transmission technology is configured with a direct current power return function: when the input instruction of the alternating current filter instruction cannot be executed or the fault exit of the alternating current filter is unavailable, the total input amount of the alternating current filter does not meet the running requirement of the direct current system, and in order to avoid overload of the alternating current filter during operation, the system starts a direct current power return function to reduce the direct current power so as to meet the requirement of the direct current power on the number of the operational alternating current filters.
At present, the direct current power return function is to judge whether the direct current power return instruction needs to be executed or not by judging whether the total input number of the group of alternating current filters meets the requirement of the corresponding direct current power value, the judging mode is single and mechanical, the risk of misjudgment exists, the accuracy of direct current power control in reactive power control is reduced, and the stability of a direct current power transmission system is further reduced.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a power control method, apparatus, computer device, computer-readable storage medium, and computer program product for a hvdc power transmission system capable of improving the accuracy of dc power control in the hvdc power transmission system.
In a first aspect, the present application provides a power control method for a hvdc transmission system. The method comprises the following steps:
acquiring the working condition state of a high-voltage direct-current transmission system;
determining a power return triggering condition for the high-voltage direct-current transmission system according to the working condition state;
determining a power reference value updating instruction aiming at the current direct current power reference value according to the working condition state; the current direct current power reference value comprises a reference value used for indicating that the power value of the high-voltage direct current power transmission system tends to be required by an index;
and under the condition that the current direct current power reference value meets the power return triggering condition, updating the current direct current power reference value according to the power reference value updating instruction, and executing a power return function by utilizing the updated current direct current power reference value so as to adjust the power of the high-voltage direct current power transmission system.
In one embodiment, when the working condition state is an abnormal operation state, the power drop trigger condition is a first trigger condition, and determining the power drop trigger condition for the hvdc transmission system according to the working condition state includes:
obtaining a current direct current power actual measurement value of the high-voltage direct current transmission system which is actually measured;
obtaining the actually detected actual measured input quantity of an alternating current filter in the high-voltage direct current transmission system;
according to a preset power limit information matching table, matching to obtain an actual measurement direct current power limit value corresponding to the actual measurement input quantity;
determining the first triggering condition according to the current direct current power actual measurement value, the actual measurement direct current power limit value and the current direct current power reference value;
wherein the first triggering condition includes: within a preset index duration, the current direct current power reference value is larger than the actually measured direct current power limit value under the condition of considering a first power margin value, and the current direct current power actually measured value is larger than the actually measured direct current power limit value under the condition of considering a second power margin value; the second power margin value is greater than the first power margin value.
In one embodiment, when the abnormal operation state is a first abnormal state, the determining, according to the working condition state, a power reference value update instruction for a current dc power reference value includes:
acquiring the reference input quantity of the alternating current filter corresponding to the current direct current power reference value;
according to the power limit information matching table, matching first-stage direct current power limit values corresponding to the first quantity; the difference between the first number and the reference input number is equal to 1, and the first number is smaller than the reference input number;
determining the power reference value updating instruction according to the first-stage direct current power limit value, the actually measured direct current power limit value and a preset third margin power value;
the first abnormal state comprises a working condition state that the maximum voltage control function of a control system in the high-voltage direct-current power transmission system prohibits the input of the alternating-current filter for starting.
In one embodiment, the updating the current dc power reference value according to the power reference value update instruction includes:
when the first number is larger than or equal to the actually measured input number, taking the first power value as the updated current direct current power reference value; the first power value comprises a difference value between the first stage direct current power limit value and a third margin power value;
When the first abnormal state is not eliminated and the second number is larger than or equal to the actually measured input number, matching according to the power limiting information matching table to obtain a second-stage direct current power limiting value corresponding to the second number; the difference between the second number and the reference input number is equal to 2, and the second number is smaller than the reference input number;
taking the second power value as the updated current direct current power reference value; the second power value includes a difference between the second stage dc power limit value and the third margin power value.
In one embodiment, in the case that the abnormal operation state is the second abnormal state, the determining, according to the working condition state, a power reference value update instruction for the current dc power reference value includes:
determining the power reference value updating instruction according to the actually measured direct current power limit value and a preset third power margin value;
the second abnormal state comprises a working condition state in which a current margin compensation function in the high-voltage direct-current transmission system is started.
In one embodiment, when the working condition state is a normal running state, the power drop trigger condition is a second trigger condition, and determining the power drop trigger condition for the hvdc transmission system according to the working condition state includes:
Obtaining the actually detected actual measured input quantity of an alternating current filter in the high-voltage direct current transmission system;
according to a preset power limit information matching table, matching to obtain an actual measurement direct current power limit value corresponding to the actual measurement input quantity;
determining the second trigger condition according to the actually measured direct current power limit value and the current direct current power reference value; the second trigger condition includes: the current direct current power reference value is larger than the actually measured direct current power limit value under the condition of considering a first power margin value within the preset index duration time;
the determining a power reference value update instruction for the current direct current power reference value according to the working condition state comprises the following steps:
and determining the power reference value updating instruction according to the actually measured direct current power limit value and a preset third power margin value.
In a second aspect, the present application further provides a power control device of a hvdc transmission system. The device comprises:
the working condition acquisition module is used for acquiring the working condition state of the high-voltage direct-current transmission system;
the triggering condition determining module is used for determining a power return triggering condition for the high-voltage direct-current transmission system according to the working condition state;
The updating instruction determining module is used for determining a power reference value updating instruction aiming at the current direct current power reference value according to the working condition state; the current direct current power reference value comprises a reference value used for indicating that the power value of the high-voltage direct current power transmission system tends to be required by an index;
and the power back-off module is used for updating the current direct current power reference value according to the power reference value updating instruction under the condition that the current direct current power reference value meets the power back-off triggering condition, and executing a power back-off function by utilizing the updated current direct current power reference value so as to adjust the power of the high-voltage direct current power transmission system.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:
acquiring the working condition state of a high-voltage direct-current transmission system;
determining a power return triggering condition for the high-voltage direct-current transmission system according to the working condition state;
determining a power reference value updating instruction aiming at the current direct current power reference value according to the working condition state; the current direct current power reference value comprises a reference value used for indicating that the power value of the high-voltage direct current power transmission system tends to be required by an index;
And under the condition that the current direct current power reference value meets the power return triggering condition, updating the current direct current power reference value according to the power reference value updating instruction, and executing a power return function by utilizing the updated current direct current power reference value so as to adjust the power of the high-voltage direct current power transmission system.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
acquiring the working condition state of a high-voltage direct-current transmission system;
determining a power return triggering condition for the high-voltage direct-current transmission system according to the working condition state;
determining a power reference value updating instruction aiming at the current direct current power reference value according to the working condition state; the current direct current power reference value comprises a reference value used for indicating that the power value of the high-voltage direct current power transmission system tends to be required by an index;
and under the condition that the current direct current power reference value meets the power return triggering condition, updating the current direct current power reference value according to the power reference value updating instruction, and executing a power return function by utilizing the updated current direct current power reference value so as to adjust the power of the high-voltage direct current power transmission system.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:
acquiring the working condition state of a high-voltage direct-current transmission system;
determining a power return triggering condition for the high-voltage direct-current transmission system according to the working condition state;
determining a power reference value updating instruction aiming at the current direct current power reference value according to the working condition state; the current direct current power reference value comprises a reference value used for indicating that the power value of the high-voltage direct current power transmission system tends to be required by an index;
and under the condition that the current direct current power reference value meets the power return triggering condition, updating the current direct current power reference value according to the power reference value updating instruction, and executing a power return function by utilizing the updated current direct current power reference value so as to adjust the power of the high-voltage direct current power transmission system.
According to the power control method, the device, the computer equipment, the storage medium and the computer program product of the high-voltage direct-current power transmission system, the working condition state of the high-voltage direct-current power transmission system is firstly obtained, then the power return triggering condition for the high-voltage direct-current power transmission system is determined according to the working condition state, further the power reference value updating instruction for the current direct-current power reference value is determined according to the working condition state, finally the current direct-current power reference value is updated according to the power reference value updating instruction under the condition that the current direct-current power reference value meets the power return triggering condition, the updated current direct-current power reference value is utilized to execute the power return function so as to adjust the power of the high-voltage direct-current power transmission system, different power adjustment indexes are set according to the working condition state, a systematic control strategy is provided, the probability of misjudgment of power return is reduced under the condition that the direct-current system runs safely, meanwhile, the direct-current power loss caused by executing the power return function is reduced, the accuracy of power control in reactive power control is improved, and the stability of the direct-current power transmission system is further improved.
Drawings
Fig. 1 is an application environment diagram of a power control method of a hvdc transmission system in one embodiment;
fig. 2 is a flow chart of a method of power control of a hvdc transmission system in one embodiment;
fig. 3 is a flow chart of a power control method of a hvdc transmission system in another embodiment;
fig. 4 is a logic schematic diagram of a power back-off strategy circuit of a power control method of a hvdc transmission system in an embodiment;
fig. 5 is a block diagram of a power control device of a hvdc transmission system in one embodiment;
fig. 6 is a block diagram of a power control device of a hvdc transmission system in accordance with another embodiment;
FIG. 7 is an internal block diagram of a computer device in one embodiment;
fig. 8 is an internal structural view of a computer device in another embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It should be noted that, the user information (including, but not limited to, user equipment information, user personal information, etc.) and the data (including, but not limited to, data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data are required to comply with the related laws and regulations and standards of the related countries and regions.
The power control method of the HVDC system provided by the embodiment of the application can be applied to an application environment shown in fig. 1. Wherein the terminal 102 communicates with the server 104 via a network.
The terminal 102 may be, but not limited to, various personal computers, notebook computers, smart phones, tablet computers, internet of things devices, and portable wearable devices, where the internet of things devices may be smart speakers, smart televisions, smart air conditioners, smart vehicle devices, and the like. The portable wearable device may be a smart watch, smart bracelet, headset, or the like. The server 104 may be implemented as a stand-alone server or as a server cluster of multiple servers.
In one embodiment, as shown in fig. 2, a power control method of a hvdc transmission system is provided, and the method is applied to the terminal 102 in fig. 1 for illustration, and includes the following steps:
s201, acquiring the working condition state of the HVDC transmission system.
The working condition states comprise a normal operation state and an abnormal operation state, the abnormal operation state comprises a first abnormal state and a second abnormal state, specifically, the first abnormal state is a working condition state that a maximum voltage control (Umax) function of a control system in the high-voltage direct-current power transmission system is forbidden to be started by an alternating-current filter, and the second abnormal state comprises a working condition state that a current margin compensation function in the high-voltage direct-current power transmission system is started.
S202, determining a power return triggering condition for the HVDC transmission system according to the working condition state.
The power drop triggering condition is a triggering condition for triggering a power drop command, and the triggering condition is different according to different working conditions.
Illustratively, under the working condition of the normal running state, the power-back triggering condition is as follows: the current DC power reference value P_ref minus one DeltaP_1 is larger than P_lim_N_act, and the time for meeting the condition reaches DeltaT_set1.
S203, determining a power reference value updating instruction for the current direct current power reference value according to the working condition state.
The power reference value updating instruction is used for updating a current direct current power reference value, wherein the current direct current power reference value comprises a reference value used for indicating that the power value of the high-voltage direct current power transmission system tends to be in index requirement.
For example, under the working condition of the normal running state, the power reference value updating instruction includes: p_new_ref is set to the current subgroup AC filter input N_act corresponding DC power limit value P_lim_act minus one ΔP_3.P_new_ref is the updated current power reference value.
S204, under the condition that the current direct current power reference value meets the power return triggering condition, updating the current direct current power reference value according to the power reference value updating instruction, and executing a power return function by utilizing the updated current direct current power reference value so as to adjust the power of the high-voltage direct current power transmission system.
In an exemplary embodiment, under the condition that the current dc power reference value p_ref minus one Δp_1 is greater than p_lim_n_act and the time for continuously satisfying the condition reaches Δt_set1, the p_new_ref is set to be the current subgroup ac filter input n_act corresponding dc power limit value p_lim_act minus one Δp_3, and the p_new_ref is used as a parameter to perform a power return function to return the power of the high-voltage dc transmission system to the level of p_new_ref.
In the power control method of the high-voltage direct current transmission system, firstly, the working condition state of the high-voltage direct current transmission system is obtained, then the power return triggering condition for the high-voltage direct current transmission system is determined according to the working condition state, further, the power reference value updating command for the current direct current power reference value is determined according to the working condition state, finally, under the condition that the current direct current power reference value meets the power return triggering condition, the current direct current power reference value is updated according to the power reference value updating command, the updated current direct current power reference value is utilized to execute the power return function so as to adjust the power of the high-voltage direct current transmission system, the working condition state and various parameters are combined to form a direct current power return criterion, and different power adjustment indexes are set according to the working condition state, so that systematic control strategies are provided, under the condition that the safe operation of the direct current transmission system is ensured, the probability of misjudgment of power return is reduced, meanwhile, the direct current power loss caused by executing the power return function is reduced, the accuracy of power control in reactive power control is improved, and the stability of the direct current transmission system is further improved.
In one embodiment, in a case that the working condition state is an abnormal operation state, the power back-off triggering condition is a first triggering condition, and determining the power back-off triggering condition for the hvdc transmission system according to the working condition state includes: obtaining a current direct current power actual measurement value of an actually measured high-voltage direct current transmission system; obtaining the actually measured input quantity of an alternating current filter in an actually detected high-voltage direct current transmission system; according to a preset power limit information matching table, matching to obtain an actual measurement direct current power limit value corresponding to the actual measurement input quantity; and determining a first trigger condition according to the current direct current power actual measurement value, the actual measurement direct current power limit value and the current direct current power reference value.
The abnormal operation state is also called an abnormal working condition, the abnormal operation state comprises a first abnormal state and a second abnormal state, specifically, the first abnormal state is a working condition state that a maximum voltage (Umax) control function of a control system in the high-voltage direct-current power transmission system is forbidden to be started by the alternating-current filter, and the second abnormal state comprises a working condition state that a current margin compensation function in the high-voltage direct-current power transmission system is started.
The current direct current power actual measurement value is the actual measured direct current power value of the high-voltage direct current power transmission system, the actual measurement input quantity is the actually detected input quantity of alternating current filters in the high-voltage direct current power transmission system, the matching relation between the input quantity of the alternating current filters and the actual measurement direct current power limit value is recorded in a power limit information matching table, and the actual measurement direct current power limit value is a specific index for limiting the direct current power, wherein the specific index is obtained by setting the performance of the direct current engineering alternating current filter and a fixed value research report.
The first triggering condition is a condition for triggering the power fallback function under the working condition of the abnormal operation state. The first trigger condition may be: in the preset index duration, the current direct current power reference value is larger than the actually measured direct current power limiting value under the condition of considering the first power margin value, and the current direct current power actually measured value is larger than the actually measured direct current power limiting value under the condition of considering the second power margin value; the second power margin value is greater than the first power margin value.
Illustratively, under an abnormal operation condition of the hvdc transmission system, the first triggering condition is: the current direct current power reference value P_ref minus one delta P_1 is larger than P_lim_N_act, the current direct current power actual value P_act minus one delta P_2 is larger than P_lim_N_act, and the time for meeting the condition reaches delta T_set1.
Specifically, the preset index duration is denoted as t_set1, the current dc power reference value is denoted as p_ref, the first power margin value is denoted as Δp_1, the measured dc power limit value is denoted as p_lim_n_act, and the second power margin value is denoted as Δp_2.
Generally, the second power margin value is larger than the first power margin value, for example, Δp_1 takes 10MW, Δp_2 takes 20MW, and the margin is increased under abnormal working conditions to ensure the accuracy of judgment under the abnormal working conditions, and the value of Δt_set1 is larger than the time required for the group of ac filters to receive the input command and complete the input, for example, taking 10s.
In this embodiment, the actual measured value of the current dc power of the actually measured hvdc transmission system is obtained first, then the actually measured input quantity of the ac filter in the actually measured hvdc transmission system is obtained, and then the actually measured dc power limit value corresponding to the actually measured input quantity is obtained by matching according to the preset power limit information matching table, finally the first trigger condition is determined, the working condition state and various parameters are successfully integrated into the trigger condition, the accuracy of the execution timing of the power return function under the abnormal working condition is improved, and the reactive control efficiency is further improved.
In one embodiment, in the case that the abnormal operation state is the first abnormal state, determining the power reference value update instruction for the current dc power reference value according to the operating condition state includes: obtaining the reference input quantity of an alternating current filter corresponding to the current direct current power reference value; according to the power limit information matching table, matching the first-stage direct current power limit value corresponding to the first quantity; the difference between the first number and the reference input number is equal to 1, and the first number is smaller than the reference input number; and determining a power reference value updating instruction according to the first-stage direct current power limit value, the actually measured direct current power limit value and a preset third margin power value.
The first abnormal state comprises a working condition state that a maximum voltage (Umax) control function of a control system in the high-voltage direct-current power transmission system prohibits starting of the alternating-current filter.
The reference input quantity is the filter input quantity corresponding to the current direct current power reference value, and the corresponding relation is obtained through setting according to experience.
Wherein the difference between the first number and the reference input number is equal to 1, and the first number is smaller than the reference input number, for example, the first number is n_ref-1, where n_ref is the reference input number.
The first stage dc power limit value is a dc power limit value corresponding to the first number, and the correspondence is set according to the performance of each dc engineering ac filter and the fixed value research report, for example, the group ac filter input n_ref-1 corresponding dc power limit values are recorded as p_lim_1.
Illustratively, the control system Umax function in the abnormal operating condition prohibits the operating condition after the input filter is started, and the power reference value update command is: setting new DC power reference value P_new_ref to input N_ref-1 corresponding DC power limiting values P_lim_1 minus one delta P_3 for the group AC filter.
Specifically, Δp_3 is a third margin value, generally 20MW is taken, which is used to reserve margin for the process of updating the dc power reference value, so as to ensure the stability of the adjustment of the dc power reference value.
In this embodiment, the reference input number of the ac filter corresponding to the current dc power reference value is first obtained, then the first stage dc power limit value corresponding to the first number is matched according to the power limit information matching table, and finally the power reference value update instruction is determined according to the first stage dc power limit value, the actually measured dc power limit value and the preset third power margin value.
In one embodiment, updating the current dc power reference value according to the power reference value update instruction includes: under the condition that the first quantity is larger than or equal to the actually measured input quantity, taking the first power value as an updated current direct current power reference value; under the condition that the first abnormal state is not eliminated and the second number is larger than or equal to the actually measured input number, matching according to the power limiting information matching table to obtain a second-stage direct current power limiting value corresponding to the second number; and taking the second power value as the updated current direct current power reference value.
The first power value comprises a difference value between the first stage direct current power limit value and the third margin power value; the difference between the second number and the reference input number is equal to 2, and the second number is smaller than the reference input number; the second power value includes a difference between the second stage DC power limit value and the third margin power value.
For example, after the first step-back, the "control system Umax function prohibits the input filter" from being eliminated, and the new dc power reference value p_new_ref may be continuously set to the subgroup of ac filter inputs n_ref-2 corresponding dc power limit values p_lim_2 minus one Δp_3; after the second step-down is performed, the working condition of the "control system Umax function prohibiting the input of the filter" is not eliminated, and the new dc power reference value p_new_ref can be continuously set to be the n_ref-3 corresponding dc power limit values p_lim_3 minus one Δp_3 for the group ac filter input until p_new_ref is the n_act corresponding dc power limit values p_lim_act minus one Δp_3 for the current group ac filter input.
Specifically, the first number is n_ref-1, the first stage dc power limit value is denoted as p_lim_1, the third margin power value is denoted as Δp_3, and the first power value is p_lim_1- Δp_3; the second number is N_ref-2, the second stage DC power limit is denoted as P_lim_2, and the second power value is P_lim_2-DeltaP_3.
In this embodiment, first, when the first number is greater than or equal to the actually measured input number, the first power value is used as the updated current dc power reference value, then, when the first abnormal state is not eliminated, and when the second number is greater than or equal to the actually measured input number, the second stage dc power limit value corresponding to the second number is obtained by matching, finally, the second power value is used as the updated current dc power reference value, the step-by-step dc power-down process is completed, the current reference power value is gradually decreased in each stage according to a corresponding index of an ac filter until the index corresponding to the dc power limit value is decreased, and the step-down mode is adopted, so that the back-down can be stopped in time under the condition that the working condition is recovered to be normal, thereby, on the premise of ensuring the safe operation of the system, the dc power loss caused by executing the power back-down function is reduced, and the accuracy of power control in reactive power control is improved.
In one embodiment, in the case that the abnormal operation state is the second abnormal state, determining the power reference value update instruction for the current dc power reference value according to the operating condition state includes: and determining a power reference value updating instruction according to the actually measured direct current power limit value and a preset third power margin value.
The second abnormal state comprises a working condition state in which a current margin compensation function in the high-voltage direct-current transmission system is started.
Illustratively, P_new_ref is set to: the current subgroup ac filter inputs n_act corresponding dc power limit values p_lim_act minus one Δp_3.
In this embodiment, the power reference value update instruction is determined according to the actually measured dc power limit value and the preset third power margin value, and various parameters are introduced to determine the update instruction, and the power margin value is reserved, so that the accuracy and stability of the current power reference value update process in the second abnormal state are ensured.
In one embodiment, when the working condition state is a normal running state, the power back-off triggering condition is a second triggering condition, and determining the power back-off triggering condition for the hvdc transmission system according to the working condition state includes: obtaining the actually measured input quantity of an alternating current filter in an actually detected high-voltage direct current transmission system; according to a preset power limit information matching table, matching to obtain an actual measurement direct current power limit value corresponding to the actual measurement input quantity; determining a second trigger condition according to the actually measured direct current power limit value and the current direct current power reference value; the second trigger condition includes: in the preset index duration, the current direct current power reference value is larger than the actually measured direct current power limit value under the condition of considering the first power margin value; determining a power reference value update instruction for a current direct current power reference value according to the working condition state, including: and determining a power reference value updating instruction according to the actually measured direct current power limit value and a preset third power margin value.
The actually measured input quantity is the actually detected input quantity of the alternating current filters in the high-voltage direct current transmission system, the matching relation between the input quantity of the alternating current filters and the actually measured direct current power limiting value is recorded in the power limiting information matching table, and the actually measured direct current power limiting value is a specific index for limiting the direct current power, wherein the specific index is obtained by setting the performance of the alternating current filters of the direct current engineering and a fixed value research report.
The second triggering condition is a condition for triggering the power return function under the working condition of the normal running state. The second trigger condition may be: the current direct current power reference value is larger than the actually measured direct current power limit value under the condition of considering the first power margin value in the preset index duration.
Illustratively, under the normal operation condition of the hvdc transmission system, the second triggering condition is: the current DC power reference value P_ref minus one DeltaP_1 is larger than P_lim_N_act, and the time for meeting the condition reaches DeltaT_set1.
Specifically, the preset index duration is denoted as t_set1, the current dc power reference value is denoted as p_ref, the first power margin value is denoted as Δp_1, and the measured dc power limit value is denoted as p_lim_n_act.
Typically, Δp_1 takes 10MW and Δt_set1 takes more time than the group ac filter takes to receive the input command and complete the input, e.g., takes 10s.
In this embodiment, the actually detected actually measured input number of the ac filter in the high-voltage dc power transmission system is firstly obtained, then an actually measured dc power limit value corresponding to the actually measured input number is obtained by matching according to a preset power limit information matching table, a second trigger condition is further determined, and finally a power reference value update instruction is determined, so that the working condition state and various parameters are successfully integrated into the trigger condition and the update instruction, the accuracy of the execution timing of the power return function under the normal working condition is improved, and the reactive control efficiency is further improved.
In another embodiment, as shown in fig. 3, a power control method of a hvdc transmission system is provided, comprising the steps of:
s301, acquiring the working condition state of a high-voltage direct-current transmission system;
s302, obtaining a current direct current power actual measurement value of an actual measured high-voltage direct current transmission system;
s303, obtaining the actually measured input quantity of an alternating current filter in the actually detected high-voltage direct current transmission system;
s304, matching to obtain an actual measurement direct current power limit value corresponding to the actual measurement input quantity according to a preset power limit information matching table;
S305, determining a first trigger condition according to the current direct current power actual measurement value, the actual measurement direct current power limit value and the current direct current power reference value;
s306, obtaining the reference input quantity of the alternating current filter corresponding to the current direct current power reference value;
s307, matching the first stage direct current power limit value corresponding to the first quantity according to the power limit information matching table;
s308, determining a power reference value updating instruction according to the first-stage direct current power limit value, the actually measured direct current power limit value and a preset third margin power value;
s309, under the condition that the current direct current power reference value meets the power fallback triggering condition, updating the current direct current power reference value according to the power reference value updating instruction;
and S310, performing a power back-down function by using the updated current direct current power reference value so as to adjust the power of the high-voltage direct current transmission system.
It should be noted that, the specific limitation of the above steps may be referred to the specific limitation of the power control method of a hvdc transmission system, which is not described herein.
In one embodiment, the reactive control power back-off strategy for the hvdc transmission system is mainly: a single logic is adopted to judge whether the total input number of the group of alternating current filters meets the requirement of the direct current power value or not so as to judge whether the power return instruction needs to be executed or not.
In the actual operation process, the power back-off strategy of the embodiment exposes that the function cannot be matched with requirements of the high-voltage direct-current transmission system under different operation conditions, so that the risk of misoperation exists in the power back-off function of the high-voltage direct-current system.
In this embodiment, when the operation mode of the dc system changes, for example, when the rectifying station enters the minimum triggering angle control and the current margin supplementing function of the dc power transmission system is started, the dc power reference value will be superimposed with a compensation value, which may trigger the dc power fallback logic, but the actual power value is still below the original power reference value, at this time, the dc power transmission system does not need to start the dc power fallback function, and the situation of misjudgment of power fallback occurs because the judging logic does not consider the actual working condition.
Based on the above, the application provides a power control method of a high-voltage direct-current power transmission system, and a systematic control strategy is provided, and a direct-current power return criterion is formed by utilizing a direct-current power reference value, a direct-current power actual value, N corresponding direct-current power limiting values P_lim_N input by a group of alternating-current filters, the number N_act input by the current group of alternating-current filters and the operation working condition of the high-voltage direct-current power transmission system, so that the optimal treatment effect of the minimum direct-current power loss is realized under the condition that the safe operation of the direct-current system can be ensured, the probability of misjudgment of power return is reduced, and the accuracy of power control is improved.
For ease of understanding by those skilled in the art, fig. 4 is an exemplary schematic diagram of a power back-off strategy circuit of a power control method for a hvdc transmission system, and the power control method for a hvdc transmission system is described in detail below with reference to fig. 4 in a specific embodiment. It is to be understood that the following description is exemplary only and is not intended to limit the application to the details of construction and the arrangements of the components set forth herein.
The power control method of the HVDC transmission system provided by the application comprises the following steps:
collecting N corresponding direct current power limiting values input by a group of alternating current filters, and marking the limiting values as P_lim_N; wherein the dc power limit is in Megawatts (MW). Wherein, the DC power limit value is set according to the performance of each DC engineering alternating current filter and the fixed value research report.
The current DC power reference value is collected and is recorded as P_ref.
The number of the AC filters which are required to be input and corresponding to the current DC power reference value P_ref is collected and is recorded as N_ref. The correspondence between p_ref and n_ref may be empirically set.
The actual value of the current direct current power is collected and recorded as P_act.
The input number of the current group of alternating current filters is collected and is recorded as N_act.
The corresponding direct current power limiting values P_lim_N_act of the current group alternating current filter investment N_act are collected. Wherein, the DC power limit value is set according to the performance of each DC engineering alternating current filter and the fixed value research report.
And then carrying out data processing on the collected current data, wherein the data processing process comprises the steps (a) to (f), and specifically comprises the following steps:
(a) Under the operating condition of the high-voltage direct-current power transmission system, whether the current direct-current power reference value P_ref is larger than P_lim_N_act or not after subtracting a delta P_1 (generally taking 10 MW) is judged; if the time to continue to meet the condition reaches DeltaT_set1 (typically 10s, more than the time required for the group AC filter to receive the input command and complete the input), then criterion one is met. Wherein, the formula of the criterion I is expressed as follows: p_ref- Δp_1> p_lim_n_act.
(b) Under the abnormal operation condition of the high-voltage direct-current transmission system: the method comprises the steps that a current margin compensation function is started, a Umax function of a control system forbids input of an alternating current filter to start working conditions, and whether a current direct current power actual value P_act is larger than P_lim_N_act or not is judged by subtracting a delta P_2 (20 MW is generally taken, and margin is increased under abnormal working conditions); if the time to continue to satisfy the condition reaches DeltaT_set1, criterion two is satisfied. Wherein, the formula of the criterion II is expressed as follows: p_act- ΔP_2> P_lim_N_act.
(c) Under the abnormal operation condition of the high-voltage direct-current power transmission system, the first criterion and the second criterion are met simultaneously, and then the power return strategy of the high-voltage direct-current system starts direct-current power return and instructs the direct-current power reference value to return to a new direct-current power reference value P_new_ref (unit MW).
(d) Under the normal working condition of the high-voltage direct-current transmission system, the power return strategy of the high-voltage direct-current system starts direct-current power return to be reduced as long as the criterion is met; the dc power reference is commanded back down to the new dc power reference p_new_ref.
(e) For the control system Umax function in the abnormal operation condition, the condition after the input filter is started is forbidden, and a new direct current power reference value P_new_ref is set as a group of direct current power limiting values P_lim_1 corresponding to the input N_ref-1 of the alternating current filter minus one delta P_3 (20 MW is generally taken). Wherein, the formula of the reference value setting process is expressed as follows: p_new_ref=p_lim_1- Δp_3.
After the first time of power-down is executed, the power-down judging logic is executed again, whether the requirements of the first criterion and the second criterion are still met at the moment is judged, and if the requirements are met, the direct current power is reduced step by step.
The power drop judgment logic refers to judgment logic which is simultaneously satisfied by the first criterion and the second criterion under the abnormal operation working conditions in the steps (a), b) and (c), and if the requirements of the first criterion and the second criterion are still satisfied, the maximum voltage control function is proved to prohibit the working condition state of starting the alternating current filter from being eliminated, that is, the power is not dropped back to an ideal state, and the next power drop operation is needed at the moment.
For example, after the first step-down, the first and second criteria are still met, and the new dc power reference p_new_ref may be set to the subgroup ac filter input n_ref-2 corresponding dc power limit p_lim_2 minus one Δp_3. Wherein, the formula of the reference value setting process is expressed as follows: p_new_ref=p_lim_2- Δp_3;
after the second step-down is performed, the first criterion and the second criterion are still satisfied, and the new direct current power reference value P_new_ref can be continuously set as the input N_ref-3 corresponding direct current power limiting values P_lim_3 minus one delta P_3 of the group alternating current filter until P_new_ref is the input N_act corresponding direct current power limiting values P_lim_act minus one delta P_3 of the current group alternating current filter; wherein, the formula of the process of setting the reference value is expressed as follows: P_new_ref=P_lim_act- ΔP_3 (N_ref-1. Gtoreq.N_act).
The specific meaning is as follows: after the second step-down is carried out, the first criterion and the second criterion are still met, and under the condition that the P_new_ref is not reduced to the P_lim_act-DeltaP_3 index value, taking the input N_ref of the group of alternating current filters as a reference, subtracting 1 in sequence, and executing a power-down instruction in stages; after the second step-down, the power-down is terminated if criteria one and two are still met and P_new_ref has been reduced to the P_lim_act- ΔP_3 index value.
In addition, in the process of stepping down the direct current power section by section, for example, after any one stepping down is executed, the system removes the limit of 'Umax function forbidden input', the working condition is recovered to be normal, and the stepping down is stopped in time at the moment, so that the minimum direct current power loss is realized under the condition of ensuring the safe operation of the system.
(f) Under other operation conditions of the HVDC system, P_new_ref is obtained by subtracting one delta P_3 from N_act corresponding DC power limiting values P_lim_act of the current group AC filter investment, and the formula of the reference value setting process is as follows: p_new_ref=p_lim_act- Δp_3. Other operation conditions include a current margin compensation function start-up condition and a normal condition.
In a specific embodiment, the correspondence between the dc system power and the number and combination of ac filters are shown in table 1, and table 1 shows the number and combination of ac filters corresponding to different dc system power.
The dc power limit value is set according to the performance of each dc engineering ac filter and the fixed value research report, and a and B in table 1 respectively represent two types of ac filters, for example, "2400" and "1a+1b" in the first data line in table 1 represent 1a type of ac filter and 1B type of ac filter, where the total number N of ac filters is 2, and the corresponding dc power of the dc system is 2400MW.
| DC system power (MW) | Number and combination of input AC filters |
| 2400 | 1A+1B |
| 2800 | 2A+1B |
| 3200 | 2A+2B |
| 3600 | 3A+2B；2A+3B |
| 4000 | 3A+3B |
| 4400 | 4A+3B；3A+4B |
| 4800 | 4A+4B；5A+3B；3A+5B |
| 5200 | 5A+4B；4A+5B |
TABLE 1
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a power control device of the high-voltage direct-current transmission system for realizing the power control method of the high-voltage direct-current transmission system. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of the power control device of one or more hvdc transmission systems provided below may be referred to the limitation of the power control method of the hvdc transmission system hereinabove, and will not be repeated here.
In one embodiment, as shown in fig. 5, there is provided a power control apparatus of a hvdc transmission system, comprising: the device comprises a working condition acquisition module 501, a trigger condition determination module 502, an update instruction determination module 503 and a power fallback module 504, wherein: the working condition acquisition module 501 is used for acquiring the working condition state of the HVDC system; the trigger condition determining module 502 is configured to determine a power drop trigger condition for the hvdc transmission system according to the working condition state; an update instruction determining module 503, configured to determine a power reference value update instruction for the current dc power reference value according to the working condition state; the current direct current power reference value comprises a reference value used for indicating that the power value of the high-voltage direct current transmission system tends to be in index requirement; the power back-off module 504 is configured to update the current dc power reference value according to the power reference value update command when the current dc power reference value meets the power back-off trigger condition, and perform a power back-off function by using the updated current dc power reference value to adjust the power of the high-voltage dc power transmission system.
In one embodiment, the trigger condition determination module is further to: obtaining a current direct current power actual measurement value of an actually measured high-voltage direct current transmission system; obtaining the actually measured input quantity of an alternating current filter in an actually detected high-voltage direct current transmission system; according to a preset power limit information matching table, matching to obtain an actual measurement direct current power limit value corresponding to the actual measurement input quantity; determining a first trigger condition according to the current direct current power actual measurement value, the actual measurement direct current power limit value and the current direct current power reference value; wherein the first trigger condition includes: in the preset index duration, the current direct current power reference value is larger than the actually measured direct current power limiting value under the condition of considering the first power margin value, and the current direct current power actually measured value is larger than the actually measured direct current power limiting value under the condition of considering the second power margin value; the second power margin value is greater than the first power margin value.
In one embodiment, the update instruction determination module is further to: obtaining the reference input quantity of an alternating current filter corresponding to the current direct current power reference value; according to the power limit information matching table, matching the first-stage direct current power limit value corresponding to the first quantity; the difference between the first number and the reference input number is equal to 1, and the first number is smaller than the reference input number; determining a power reference value updating instruction according to the first-stage direct current power limit value, the actually measured direct current power limit value and a preset third margin power value; the first abnormal state comprises a working condition state that the maximum voltage control function of a control system in the high-voltage direct-current power transmission system prohibits the input of the alternating-current filter for starting.
In one embodiment, the power back-off module is further to: under the condition that the first quantity is larger than or equal to the actually measured input quantity, taking the first power value as an updated current direct current power reference value; the first power value comprises a difference value between the first stage direct current power limit value and the third margin power value; under the condition that the first abnormal state is not eliminated and the second number is larger than or equal to the actually measured input number, matching according to the power limiting information matching table to obtain a second-stage direct current power limiting value corresponding to the second number; the difference between the second number and the reference input number is equal to 2, and the second number is smaller than the reference input number; taking the second power value as an updated current direct current power reference value; the second power value includes a difference between the second stage DC power limit value and the third margin power value.
In one embodiment, the update instruction determination module is further to: determining a power reference value updating instruction according to the actually measured direct current power limit value and a preset third power margin value; the second abnormal state comprises a working condition state in which a current margin compensation function in the high-voltage direct-current transmission system is started.
In one embodiment, the trigger condition determination module is further to: obtaining the actually measured input quantity of an alternating current filter in an actually detected high-voltage direct current transmission system; according to a preset power limit information matching table, matching to obtain an actual measurement direct current power limit value corresponding to the actual measurement input quantity; determining a second trigger condition according to the actually measured direct current power limit value and the current direct current power reference value; the second trigger condition includes: in the preset index duration, the current direct current power reference value is larger than the actually measured direct current power limit value under the condition of considering the first power margin value; the update instruction determining module is further configured to determine a power reference value update instruction according to the actually measured dc power limit value and a preset third power margin value.
In one embodiment, as shown in fig. 6, there is provided a power control apparatus of another hvdc transmission system, comprising: the power return device of the high-voltage direct-current transmission system is respectively connected with the h converter station direct-current control devices.
In this embodiment, the hvth power transmission system power drop-back device is connected with h (not less than 1) dc control devices of the converter station configured with the subgroup ac filters for reactive power control, and the hvth power transmission system power drop-back device is configured to receive information such as a dc power reference value, a dc power actual value, a subgroup ac filter input N corresponding dc power limit values p_lim_n, a subgroup ac filter actual input number, an hvth power transmission system operation condition, and the like of the converter station control device in the hvth power transmission system in real time, and to send an action command of a dc power drop-back strategy to the control device in the hvth power transmission system to execute after integrating the information.
The modules in the power control device of the hvdc transmission system may be all or partially implemented by software, hardware or a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, an Input/Output interface (I/O) and a communication interface. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface is connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an 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 media. The database of the computer device is for storing data. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, implements a method for power control of a hvdc transmission system.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 8. The computer device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program, when executed by a processor, implements a method for power control of a hvdc transmission system. The display unit of the computer device is used for forming a visual picture, and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structures shown in fig. 7 and 8 are block diagrams of only some of the structures associated with the present application and are not intended to limit the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device includes a memory having a computer program stored therein and a processor that when executing the computer program performs the steps of the method embodiments described above.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A method of power control for a hvdc transmission system, the method comprising:
acquiring the working condition state of a high-voltage direct-current transmission system;
determining a power return triggering condition for the high-voltage direct-current transmission system according to the working condition state;
determining a power reference value updating instruction aiming at the current direct current power reference value according to the working condition state; the current direct current power reference value comprises a reference value used for indicating that the power value of the high-voltage direct current power transmission system tends to be required by an index;
And under the condition that the current direct current power reference value meets the power return triggering condition, updating the current direct current power reference value according to the power reference value updating instruction, and executing a power return function by utilizing the updated current direct current power reference value so as to adjust the power of the high-voltage direct current power transmission system.
2. The method of claim 1, wherein the power back-off trigger condition is a first trigger condition when the operating condition is an abnormal operating condition, and wherein determining the power back-off trigger condition for the hvdc transmission system according to the operating condition comprises:
obtaining a current direct current power actual measurement value of the high-voltage direct current transmission system which is actually measured;
obtaining the actually detected actual measured input quantity of an alternating current filter in the high-voltage direct current transmission system;
according to a preset power limit information matching table, matching to obtain an actual measurement direct current power limit value corresponding to the actual measurement input quantity;
determining the first triggering condition according to the current direct current power actual measurement value, the actual measurement direct current power limit value and the current direct current power reference value;
Wherein the first triggering condition includes: within a preset index duration, the current direct current power reference value is larger than the actually measured direct current power limit value under the condition of considering a first power margin value, and the current direct current power actually measured value is larger than the actually measured direct current power limit value under the condition of considering a second power margin value; the second power margin value is greater than the first power margin value.
3. The method of claim 2, wherein, in the case where the abnormal operation state is the first abnormal state, the determining the power reference value update instruction for the current dc power reference value according to the operating condition state includes:
acquiring the reference input quantity of the alternating current filter corresponding to the current direct current power reference value;
according to the power limit information matching table, matching first-stage direct current power limit values corresponding to the first quantity; the difference between the first number and the reference input number is equal to 1, and the first number is smaller than the reference input number;
determining the power reference value updating instruction according to the first-stage direct current power limit value, the actually measured direct current power limit value and a preset third margin power value;
The first abnormal state comprises a working condition state that the maximum voltage control function of a control system in the high-voltage direct-current power transmission system prohibits the input of the alternating-current filter for starting.
4. A method according to claim 3, wherein said updating said current dc power reference value in accordance with said power reference value update instruction comprises:
when the first number is larger than or equal to the actually measured input number, taking the first power value as the updated current direct current power reference value; the first power value comprises a difference value between the first stage direct current power limit value and a third margin power value;
when the first abnormal state is not eliminated and the second number is larger than or equal to the actually measured input number, matching according to the power limiting information matching table to obtain a second-stage direct current power limiting value corresponding to the second number; the difference between the second number and the reference input number is equal to 2, and the second number is smaller than the reference input number;
taking the second power value as the updated current direct current power reference value; the second power value includes a difference between the second stage dc power limit value and the third margin power value.
5. The method of claim 2, wherein, in the case where the abnormal operation state is the second abnormal state, the determining the power reference value update instruction for the current dc power reference value according to the operating condition state includes:
determining the power reference value updating instruction according to the actually measured direct current power limit value and a preset third power margin value;
the second abnormal state comprises a working condition state in which a current margin compensation function in the high-voltage direct-current transmission system is started.
6. The method of claim 1, wherein the power back-off trigger condition is a second trigger condition if the operating condition state is a normal operating state, and wherein determining the power back-off trigger condition for the hvdc transmission system according to the operating condition state comprises:
obtaining the actually detected actual measured input quantity of an alternating current filter in the high-voltage direct current transmission system;
according to a preset power limit information matching table, matching to obtain an actual measurement direct current power limit value corresponding to the actual measurement input quantity;
determining the second trigger condition according to the actually measured direct current power limit value and the current direct current power reference value; the second trigger condition includes: the current direct current power reference value is larger than the actually measured direct current power limit value under the condition of considering a first power margin value within the preset index duration time;
The determining a power reference value update instruction for the current direct current power reference value according to the working condition state comprises the following steps:
and determining the power reference value updating instruction according to the actually measured direct current power limit value and a preset third power margin value.
7. A power control device for a hvdc transmission system, the device comprising:
the working condition acquisition module is used for acquiring the working condition state of the high-voltage direct-current transmission system;
the triggering condition determining module is used for determining a power return triggering condition for the high-voltage direct-current transmission system according to the working condition state;
the updating instruction determining module is used for determining a power reference value updating instruction aiming at the current direct current power reference value according to the working condition state; the current direct current power reference value comprises a reference value used for indicating that the power value of the high-voltage direct current power transmission system tends to be required by an index;
and the power back-off module is used for updating the current direct current power reference value according to the power reference value updating instruction under the condition that the current direct current power reference value meets the power back-off triggering condition, and executing a power back-off function by utilizing the updated current direct current power reference value so as to adjust the power of the high-voltage direct current power transmission system.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311480420.XA CN117498421A (en) | 2023-11-08 | 2023-11-08 | Power control method and device for HVDC transmission system and computer equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311480420.XA CN117498421A (en) | 2023-11-08 | 2023-11-08 | Power control method and device for HVDC transmission system and computer equipment |
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| CN117498421A true CN117498421A (en) | 2024-02-02 |
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| CN202311480420.XA Pending CN117498421A (en) | 2023-11-08 | 2023-11-08 | Power control method and device for HVDC transmission system and computer equipment |
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| CN (1) | CN117498421A (en) |
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