CN117878922A - Self-adaptive frequency voltage emergency control method, system and medium for electric power system - Google Patents
Self-adaptive frequency voltage emergency control method, system and medium for electric power system Download PDFInfo
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Abstract
The invention discloses a method, a system and a medium for emergency control of self-adaptive frequency and voltage of an electric power system, wherein the method comprises the steps of collecting data of bus voltage of a transformer substation and a message of a substation control layer of the transformer substation, extracting frequency and amplitude, and judging the property of an outgoing line interval; and comparing the frequency and amplitude of the bus voltage of the transformer substation and the change rate of the bus voltage with a set constant value item to determine the action turn of the emergency control action of the current frequency voltage, and carrying out wire outlet interval property according to the corresponding action turn and wire outlet interval data to realize load shedding by cutting off branch loads of the distribution network preferentially on the premise of meeting the total load quantity of the cut-off interval specified by a constant value list. Aiming at the challenge of changing the outlet load property of a transformer substation caused by large-scale access of a novel power system distributed power supply, the invention realizes an efficient, reliable and economical frequency voltage emergency control scheme to enhance the third defense line of the power system and improve the safe operation level.
Description
Technical Field
The invention relates to a frequency voltage emergency control technology in the field of electric power, in particular to a self-adaptive frequency voltage emergency control method, a self-adaptive frequency voltage emergency control system and a self-adaptive frequency voltage emergency control medium for an electric power system.
Background
When the frequency voltage is reduced due to active and reactive unbalance caused by faults in the operation of the power system, the frequency voltage emergency device of the third defense line is required to be utilized to realize emergency cutting of the load, so that the power balance and the recovery stability of the system are ensured. However, as a novel power system is built, a large amount of small power supplies such as wind power, photovoltaic and small hydropower are connected into the transformer substation, so that the load characteristic of the transformer substation is changed, partial outgoing lines of the transformer substation show power characteristics, if the corresponding outgoing lines are removed without distinction, the system further loses power, and the system frequency and voltage stability are further deteriorated. This situation becomes more serious with the increase of the new energy access scale.
In order to cope with the challenge, the Chinese patent document with publication number of CN104466971A discloses a method for distributing cut loads by considering low-frequency load shedding of distributed power supply points, which considers the load frequency characteristics of various load circuits, particularly the factors of the distributed power supply points connected to the load circuits, and overcomes the defect that the load circuits connected to the distributed power supply points cannot be considered when the traditional cut loads are selected by using the load frequency characteristics, so that a frequency emergency control device can accurately select cut loads according to different priorities. However, this method has the following problems: according to the method, the load shedding sequence of the frequency voltage emergency control device is optimized through analyzing the load frequency characteristics of the outgoing line of the transformer substation, but the situation that the power flow is reversed due to the fact that a line is connected with a distributed power supply is not considered, the third line defense construction requirement of a novel power system under the condition that a large-scale distributed new energy is connected with the line cannot be met, and the adaptability is still to be enhanced.
Disclosure of Invention
The invention aims to solve the technical problems: aiming at the problems in the prior art, the invention provides a self-adaptive frequency voltage emergency control method, a self-adaptive frequency voltage emergency control system and a self-adaptive frequency voltage emergency control medium for a power system, and aims at providing an efficient, reliable and economical frequency voltage emergency control scheme aiming at the challenge of changing the outlet load property of a transformer substation caused by large-scale access of a novel power system distributed power supply so as to effectively enhance the third defense line of the power system and improve the safe operation level.
In order to solve the technical problems, the invention adopts the following technical scheme:
an emergency control method for adaptive frequency voltage of an electric power system comprises the following steps:
step S101, performing data acquisition, including: analog quantity acquisition is carried out on voltage analog quantity signals of bus voltage of the transformer substation, and outgoing line interval data acquisition is carried out on messages of a substation control layer of the transformer substation;
step S102, processing the acquired data, including: carrying out electrical characteristic quantity analysis on the acquired voltage analog quantity signal of the bus voltage of the transformer substation to extract frequency and amplitude, and carrying out outlet interval property judgment on the acquired outlet interval data to determine that the corresponding line property is a power supply or a load;
step S103, performing a frequency voltage emergency control action, including: and comparing the frequency and amplitude of the bus voltage of the transformer substation and the change rate of the bus voltage with a set constant value item to determine the action turn of the emergency control action of the current frequency voltage, and carrying out wire outlet interval property according to the corresponding action turn and wire outlet interval data to realize load shedding by cutting off branch loads of the distribution network preferentially on the premise of meeting the total load quantity of the cut-off interval specified by a constant value list.
Optionally, in step S101, performing outgoing line interval data collection on the substation control layer packet includes:
step S201, initializing the total number N of outlet intervals max ；
Step S202, initializing a circulation variable N for traversing the wire outlet interval;
step S203, starting data acquisition of an Nth outlet interval, and setting a Flag bit flag_e to 1;
step S204, judging whether the communication between the Nth wire outlet interval N and the wire outlet interval data acquisition unit is normal and the data is valid, if so, entering step S205, and if not, entering step S206;
step S205, reading interval data of an Nth outlet interval, specifically electric quantity and switching value data output by a maintenance integrated device corresponding to the Nth outlet interval, and then entering step S206;
step S206, setting flag_e to 0;
step S207, sending the acquired interval data to a back-end module;
step S208, adding 1 to the cyclic variable N;
step S209, judging whether the cycle variable N is less than or equal to the total number of outlet intervals N max If yes, go to step S210, otherwise go to step S202;
step S210: after the delay time T seconds, the process proceeds to step S203.
Optionally, before step S101, when the device is powered on and then the program is initialized, a corresponding active characteristic flag bit loadp_n is set to 1 for any nth wire outlet interval initialization; in step S102, when the wire outlet interval property determination is performed on the collected wire outlet interval data to determine that the corresponding wire property is the power source or the load, performing the wire outlet interval property determination for any nth wire outlet interval to determine that the corresponding wire property is the power source or the load includes:
step S301, extracting active power P from outlet interval data acquired at an nth outlet interval;
step S302, if the active power P is larger than 0, outputting an active characteristic flag bit Loadp_n with a value of 1 to indicate that the line property corresponding to the nth outlet interval is a load, ending and exiting; otherwise, step S303 is entered;
step S303, judging whether the active power P extracted from the outlet interval data acquired at the nth outlet interval within the continuous appointed time period is smaller than 0, if so, initializing the nth outlet interval to set the corresponding active characteristic flag bit Loadp_n as 0, and outputting the value as 0 to indicate that the corresponding line property of the nth outlet interval is the active characteristic flag bit Loadp_n of the power supply.
Optionally, performing electrical feature quantity analysis on the collected voltage analog quantity signal of the substation bus voltage in step S102 to extract frequency and amplitude includes: the three-phase alternating current signals are converted into a vector rotation space coordinate system by utilizing the coordinate transformation on the acquired voltage analog quantity signals of the bus voltage of the transformer substation; and extracting the frequency signal of the bus voltage of the transformer substation by adopting a proportional integral controller from the voltage analog quantity signal under the vector rotation space coordinate system, and obtaining the phase signal of the bus voltage of the transformer substation by integrating the frequency signal of the bus voltage of the transformer substation to be used for coordinate transformation from the three-phase alternating current signal to the vector rotation space coordinate system.
Optionally, when the load shedding is preferably implemented by cutting off the branch load of the distribution network on the premise of meeting the total load of the cut-off interval specified by the fixed value list according to the corresponding action round and the line-out interval data in step S103, the implementation of the load shedding by cutting off the branch load of the distribution network on the premise of meeting the total load of the cut-off interval specified by the fixed value list by any ith action round includes:
step S401, according to a preset device setting value, calculating the effective removable load power sum corresponding to the in-station wire outlet interval to be removed in the action round according to the following formula:
P_total＝∑P j *Loadp_j，
in the above description, P_total is the sum of the effective removable load power corresponding to the inter-station wire outlet interval to be removed in the current operation cycle, P j For active power before interval faults to be removed in the jth action round, loadp_j is an active characteristic flag bit of which the line property corresponding to the jth outlet interval is a load, wherein the active characteristic flag bit is 1 for representing the load and 0 for representing the power supply; j is the outlet interval number of the ith action round;
step S402, discharging a distribution network branch of the power supply network from all distribution network branches of the transformer substation as a candidate distribution network branch; initializing a circulation variable m for traversing candidate distribution network branches to be equal to 1, and accumulating distribution network branch load power Pd_total to be the load power corresponding to the 1 st distribution network branch;
step S403, judging whether the accumulated distribution network branch load power Pd_total is larger than the effective removable load power sum P_total corresponding to the in-station wire outlet interval to be removed in the current operation turn, if not, adding 1 to the circulation variable m, accumulating the load power corresponding to the new mth distribution network branch into the accumulated distribution network branch load power Pd_total, and entering step S403; otherwise, go to step S404;
step S404, recording 1 st to m th distribution network branches participating in accumulation of the load power Pd_total of the distribution network branches, and sending tripping commands to the 1 st to m th distribution network branches;
step S405, judging whether the 1 st to m th distribution network branch tripping is successful or not according to the switching state of the distribution network branch circuit breaker returned by the communication module inside and outside the station, if so, ending the load shedding operation of the round and exiting; otherwise, tripping out the outlet interval with the active characteristic zone bit of 1 in the range of the current action turn in the station, and ending the current turn load shedding action.
In addition, the invention also provides an emergency control system for the self-adaptive frequency voltage of the power system, which comprises the following components:
the data acquisition program module is used for carrying out data acquisition and comprises an outgoing line interval data acquisition program unit and an analog quantity acquisition program unit, wherein the outgoing line interval data acquisition program unit is used for carrying out outgoing line interval data acquisition on a substation control layer message of a transformer substation, and the analog quantity acquisition program unit is used for carrying out analog quantity acquisition on a voltage analog quantity signal of a bus voltage of the transformer substation;
the system comprises an acquisition data processing program module, a power supply and a power supply, wherein the acquisition data processing program module is used for carrying out acquisition data processing and comprises an outlet interval property judging program module and an electrical characteristic quantity analyzing program module, the outlet interval property judging program module is used for carrying out outlet interval property judgment on acquired outlet interval data to determine that the corresponding line property is a power supply or a load, and the electrical characteristic quantity analyzing program module is used for carrying out electrical characteristic quantity analysis on a voltage analog quantity signal of the acquired transformer substation bus voltage to extract frequency and amplitude;
the frequency voltage emergency control action program module is used for executing frequency voltage emergency control action and comprises an action round judging program unit and an adaptive load shedding program unit, wherein the action round judging program unit is used for comparing the frequency and the amplitude of the bus voltage of the transformer substation and the change rate of the frequency and the amplitude with a set fixed value item to determine the action round of the current frequency voltage emergency control action, and the adaptive load shedding program unit is used for preferentially cutting off the branch load of the distribution network on the premise of meeting the total load quantity of the cut-off interval specified by the fixed value item according to the corresponding action round.
In addition, the invention also provides an emergency control system for the adaptive frequency voltage of the electric power system, which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the emergency control method for the adaptive frequency voltage of the electric power system.
Optionally, the microprocessor is further connected with an intra-station and inter-station communication module, and the intra-station and inter-station communication module is used for communicating with each branch intelligent terminal of the distribution network connected with the outside of the transformer substation through wired or wireless transmission, is used for acquiring a transformer substation control layer message from communication, transmitting a tripping signal to the corresponding intelligent terminal of the distribution network branch, and acquiring a tripping execution result returned by the intelligent terminal of the distribution network.
Furthermore, the present invention provides a computer readable storage medium having stored therein a computer program/instruction programmed or configured to execute the power system adaptive frequency voltage emergency control method by a processor.
Furthermore, the invention provides a computer program product comprising a computer program/instructions programmed or configured to execute the power system adaptive frequency voltage emergency control method by a processor.
Compared with the prior art, the invention has the following advantages:
1. aiming at the challenge that the distribution type power supply of the novel power system is accessed in a large scale to cause the change of the outlet load property of the transformer substation, the invention provides a frequency voltage emergency control scheme which is efficient, reliable and economic. A step of
2. In the prior art, whether the outlet interval is a load or a power supply is not considered in the solution, but tripping is directly carried out after the low-frequency or voltage load shedding action of the device, so that the originally network-connected line of the power supply is cut off, and the frequency and voltage stability of a system are further deteriorated.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
Fig. 2 is a flowchart of a procedure of an outgoing line interval data acquisition unit according to an embodiment of the present invention.
FIG. 3 is a flowchart of a process for determining load properties of an outlet interval according to an embodiment of the invention.
Fig. 4 is a schematic diagram of the principle of the analog quantity acquisition unit processing the I parent in the embodiment of the invention.
Fig. 5 is a schematic diagram of the principle of the analog quantity acquisition unit processing the II parent in the embodiment of the present invention.
Fig. 6 is a flowchart of an implementation procedure of adaptive frequency voltage emergency control according to an embodiment of the present invention.
Fig. 7 is a schematic block diagram of an embodiment of the present invention.
Legend description: 1. a data acquisition program module; 11. the outgoing line interval data acquisition program unit; 12. analog quantity acquisition program unit; 2. a wire outlet interval property judging program module; 3. an electrical characteristic quantity analysis program module; 4. a frequency voltage emergency control action program module; 41. a motion round judgment program unit; 42. an adaptive load shedding program unit; 5. and an intra-station and inter-station communication module.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples.
As shown in fig. 1, the adaptive frequency voltage emergency control method of the power system of the present embodiment includes:
step S101, performing data acquisition, including: analog quantity acquisition is carried out on voltage analog quantity signals of bus voltage of the transformer substation, and outgoing line interval data acquisition is carried out on messages of a substation control layer of the transformer substation;
step S102, processing the acquired data, including: carrying out electrical characteristic quantity analysis on the acquired voltage analog quantity signal of the bus voltage of the transformer substation to extract frequency and amplitude, and carrying out outlet interval property judgment on the acquired outlet interval data to determine that the corresponding line property is a power supply or a load;
step S103, performing a frequency voltage emergency control action, including: and comparing the frequency and amplitude of the bus voltage of the transformer substation and the change rate of the bus voltage with a set constant value item to determine the action turn of the emergency control action of the current frequency voltage, and carrying out wire outlet interval property according to the corresponding action turn and wire outlet interval data to realize load shedding by cutting off branch loads of the distribution network preferentially on the premise of meeting the total load quantity of the cut-off interval specified by a constant value list.
As shown in fig. 2, in step S101, performing outgoing line interval data acquisition on a substation control layer packet of a substation includes:
step S201, initializing the total number N of outlet intervals max ；
Step S202, initializing a circulation variable N for traversing the wire outlet interval;
step S203, starting data acquisition of an Nth outlet interval, and setting a Flag bit flag_e to 1;
step S204, judging whether the communication between the Nth wire outlet interval N and the wire outlet interval data acquisition unit is normal and the data is valid, if so, entering step S205, and if not, entering step S206;
step S205, reading interval data of an Nth outlet interval, specifically electric quantity and switching value data output by a maintenance integrated device corresponding to the Nth outlet interval, and then entering step S206;
step S206, setting flag_e to 0;
step S207, sending the acquired interval data to a back-end module;
step S208, adding 1 to the cyclic variable N;
step S209, judging whether the cycle variable N is less than or equal to the total number of outlet intervals N max (the value may be taken according to the actual situation, for example, the value is 48 in the present embodiment), if yes, step S210 is entered, otherwise step S202 is entered;
step S210: after the delay time T seconds, the process proceeds to step S203.
As shown in fig. 3, step S101 further includes initializing and setting a corresponding active characteristic flag bit loadp_n to 1 for any nth line outlet interval when the device is powered on and then the program is initialized; in step S102, when the wire outlet interval property determination is performed on the collected wire outlet interval data to determine that the corresponding wire property is the power source or the load, performing the wire outlet interval property determination for any nth wire outlet interval to determine that the corresponding wire property is the power source or the load includes:
step S301, extracting active power P from outlet interval data acquired at an nth outlet interval;
step S302, if the active power P is larger than 0, outputting an active characteristic flag bit Loadp_n with a value of 1 to indicate that the line property corresponding to the nth outlet interval is a load, ending and exiting; otherwise, step S303 is entered;
step S303, judging whether the active power P extracted from the outlet interval data acquired at the nth outlet interval within the continuous appointed time period is smaller than 0, if so, initializing the nth outlet interval to set the corresponding active characteristic flag bit Loadp_n as 0, and outputting the value as 0 to indicate that the corresponding line property of the nth outlet interval is the active characteristic flag bit Loadp_n of the power supply.
In this embodiment, the high-voltage side of the transformer substation includes two buses, namely a 1-bus and a 2-bus, which are respectively marked as an I-bus and a II-bus, wherein the I-bus represents the 1-bus of the high-voltage side of the transformer substation, and the II-bus represents the 2-bus of the high-voltage side of the transformer substation. As shown in fig. 4 and 5, performing electrical feature analysis on the collected voltage analog quantity signal of the substation bus voltage in step S102 to extract frequency and amplitude includes: the three-phase alternating current signals are converted into a vector rotation space coordinate system by utilizing the coordinate transformation on the acquired voltage analog quantity signals of the bus voltage of the transformer substation; and extracting a frequency signal of the bus voltage of the transformer substation by adopting a proportional integral controller from the voltage analog quantity signal under the vector rotation space coordinate system, and obtaining a phase signal of the bus voltage of the transformer substation by integrating the frequency signal of the bus voltage of the transformer substation to be used for coordinate conversion from a three-phase alternating current signal to the vector rotation space coordinate system.
As shown in fig. 6, when the load shedding is realized by cutting off the branch load of the distribution network on the premise of meeting the total load of the cut-off interval specified by the fixed value list according to the corresponding action round and the line-out interval data in step S103, the load shedding is realized by cutting off the branch load of the distribution network on the premise of meeting the total load of the cut-off interval specified by the fixed value list according to any i-th action round, which includes:
step S401, according to a preset device setting value, calculating the effective removable load power sum corresponding to the in-station wire outlet interval to be removed in the action round according to the following formula:
P_total＝∑P j *Loadp_j，
in the above description, P_total is the sum of the effective removable load power corresponding to the inter-station wire outlet interval to be removed in the current operation cycle, P j For active power before interval faults to be removed in the jth action round, loadp_j is an active characteristic flag bit of which the line property corresponding to the jth outlet interval is a load, wherein the active characteristic flag bit is 1 for representing the load and 0 for representing the power supply; j is the outlet interval number of the ith action round;
step S402, discharging a distribution network branch of the power supply network from all distribution network branches of the transformer substation as a candidate distribution network branch; initializing a circulation variable m for traversing candidate distribution network branches to be equal to 1, and accumulating distribution network branch load power Pd_total to be the load power corresponding to the 1 st distribution network branch, namely:
Pd_total＝pb1，
in the above formula, pb1 is the load power corresponding to the 1 st branch of the distribution network;
step S403, determining whether the accumulated distribution network branch load power pd_total is greater than the sum p_total of the available removable load powers corresponding to the inter-station line spacing to be removed in the current operation turn, if not, adding 1 to the circulation variable m, and accumulating the load power corresponding to the new mth distribution network branch into the accumulated distribution network branch load power pd_total, i.e.:
Pd_total＝pb1+...+pbm，
in the above formula, pb1 to pbm are load powers corresponding to the 1 st to m th distribution network branches; step S403 is entered; otherwise, go to step S404;
step S404, recording 1 st to m th distribution network branches participating in accumulation of the load power Pd_total of the distribution network branches, and sending tripping commands to the 1 st to m th distribution network branches;
step S405, judging whether the 1 st to m th distribution network branch tripping is successful or not according to the switching state of the distribution network branch circuit breaker returned by the communication module inside and outside the station, if so, ending the load shedding operation of the round and exiting; otherwise, tripping out the outlet interval with the active characteristic zone bit of 1 in the range of the current action turn in the station, and ending the current turn load shedding action.
In summary, the adaptive frequency-voltage emergency control method for the electric power system according to the embodiment provides a method for automatically monitoring and distinguishing properties of load line trend of a transformer substation according to the problem that failure risk exists in frequency-voltage emergency control after activation of a distribution network, so that the risk of mistakenly splitting a power supply internet line in the frequency-voltage emergency control can be prevented, intelligent distinguishing of load line to be cut of a third defense line of the electric power system and branch line trend information of a connected distribution network can be effectively realized, and further, the power supply line is prevented from being mistakenly cut to deteriorate system stability during frequency-voltage emergency control, and the safe and stable operation guarantee capability of a novel electric power system is effectively improved.
As shown in fig. 7, the present embodiment fully corresponds to the method for emergency control of adaptive frequency voltage of a power system according to the present embodiment, and further provides an emergency control system of adaptive frequency voltage of a power system, including:
the data acquisition program module 1 is used for carrying out data acquisition and comprises an outgoing line interval data acquisition program unit 11 and an analog quantity acquisition program unit 12, wherein the outgoing line interval data acquisition program unit 11 is used for carrying out outgoing line interval data acquisition on a transformer substation control layer message, and the analog quantity acquisition program unit 12 is used for carrying out analog quantity acquisition on a voltage analog quantity signal of a transformer substation bus voltage;
the system comprises an acquisition data processing program module, a power supply and a power supply, wherein the acquisition data processing program module is used for carrying out acquisition data processing and comprises an outlet interval property judging program module 2 and an electrical characteristic quantity analyzing program module 3, the outlet interval property judging program module 2 is used for carrying out outlet interval property judgment on acquired outlet interval data to determine that the corresponding line property is a power supply or a load, and the electrical characteristic quantity analyzing program module 3 is used for carrying out electrical characteristic quantity analysis on a voltage analog quantity signal of the acquired transformer substation bus voltage to extract frequency and amplitude;
the frequency voltage emergency control action program module 4 is configured to execute a frequency voltage emergency control action, and includes an action round judging program unit 41 and an adaptive load shedding program unit 42, where the action round judging program unit 41 is configured to compare, according to a frequency and an amplitude of a bus voltage of a transformer substation and a change rate thereof, with a set constant value term to determine an action round of the current frequency voltage emergency control action, and the adaptive load shedding program unit 42 is configured to implement load shedding by preferentially cutting off a distribution network branch load on the premise that a total load amount of a cut-off interval specified by a constant value list is satisfied according to a corresponding action round.
The adaptive frequency-voltage emergency control system of the power system of the embodiment comprises a data acquisition program module 1, an outgoing line interval property judging program module 2, an electric characteristic quantity analyzing program module 3, a frequency-voltage emergency control action program module 4 and an intra-station and inter-station communication module 5. The data acquisition program module 1 acquires the interval tide information of each line by acquiring a substation control layer network digital signal of the substation, and acquires the bus information of the high-voltage side of the substation by acquiring a voltage analog quantity signal; the outlet interval property judging program module 2 is used for analyzing whether the interval tide of the line to be cut is load property or power property; the electrical characteristic quantity analysis program module 3 judges whether the system fails according to the voltage frequency and the voltage information of the high-voltage side bus of the transformer substation; the frequency voltage emergency control action program module 4 is used for realizing the function of tripping load lines, and comprises an action round judging program unit 41 and a self-adaptive load shedding program unit 42, so that intelligent judgment of load line to be cut of a third line of an electric power system and load flow information of branch lines of a connected distribution network can be effectively realized, and further, the power supply lines are prevented from being cut mistakenly to deteriorate the system stability when frequency voltage emergency control is carried out.
The data acquisition program module 1 is used for acquiring network digital signals of a substation control layer of a substation to acquire the interval tide information of each line, acquiring bus information on the high-voltage side of the substation through acquiring voltage analog quantity signals, and outputting the result to the outlet interval property judgment program module 2 and the electrical characteristic quantity analysis program module 3.
The data acquisition program module 1 comprises an outgoing line interval data acquisition program unit 11 and an analog quantity acquisition program unit 12. The outlet interval data acquisition program unit 11 is connected to the substation control layer of the transformer substation and is communicated with the low-voltage side line interval maintenance and measurement integrated device of the transformer substation through 61850 or 103 protocols, and the data such as the electric quantity, the switching value and the like of all cut load lines are acquired from the substation control layer. The analog quantity acquisition program unit 12 acquires a voltage analog quantity signal of the substation bus voltage in the form of an analog quantity, and outputs the data to the electrical characteristic quantity analysis program module 3.
The outlet interval property judging program module 2 judges the corresponding line property as a power supply or a load by acquiring the output signal of the outlet interval data acquisition program unit 11, and outputs the result to the frequency voltage emergency control action program module 4.
The electrical characteristic quantity analysis program module 3 is used for separating the amplitude and the frequency of the bus voltage of the transformer substation, and the input end of the electrical characteristic quantity analysis program module is connected with the output end of the data acquisition program module 1. After the voltage frequency and amplitude information are extracted, the frequency-voltage emergency control action program module 4 can also judge whether the voltage frequency and amplitude information is lower than a threshold value so as to trigger the action of the frequency-voltage emergency control device.
The frequency-voltage emergency control action program module 4 is used for removing corresponding loads according to action rounds after low-frequency and low-voltage load shedding actions of the electric power system, and comprises an action round judging program unit 41 and an adaptive load shedding program unit 42, wherein the input ends of the action round judging program unit 41 are connected with the output ends of the wire outlet interval property judging program module 2, the electric characteristic quantity analyzing program module 3 and the intra-station and inter-station communication module 5. And the frequency voltage emergency control action program module 4 judges whether the low-frequency and low-voltage load shedding of the power system needs to be acted or not, if so, the power supply network branch circuits are adaptively removed and the power supply network branch circuit breakers are tripped according to the setting load shedding round and the principle of preferentially cutting off the power supply network branch loads, so that the power supply load is reserved to the greatest extent to improve the system stability. The input end of the device is connected with the output ends of the outlet wire interval property judging program module 2, the electrical characteristic quantity analyzing program module 3 and the station external communication module 5.
An input end of the action round judging program unit 41 is connected with an output end of the electrical characteristic quantity analyzing program module 3, and the current frequency voltage emergency control action round is calculated and obtained through comparing the voltage frequency, the amplitude and the change rate thereof with a fixed value item set in the frequency voltage emergency control device, and the action round information is output to the self-adaptive load shedding program unit 42.
The adaptive load shedding program unit 42 can adaptively select the distribution network branch with load property to carry out load shedding according to the corresponding load shedding round and the interval power in the load shedding range of the round before the fault so as to replace the tripping of the corresponding interval in the station, thereby preventing the error removal of the distributed power supply outside the station; in addition, if the load shedding of the distribution network branch fails, the adaptive load shedding program unit 42 can still implement the removal of the corresponding round of wire outlet intervals on the premise of removing the power supply internet line in the station.
In addition, the embodiment further comprises an intra-station and inter-station communication module 5, the intra-station and inter-station communication module 5 communicates with each branch intelligent terminal of the distribution network connected outside the transformer substation in a wired or wireless transmission mode, on one hand, the distribution network segments and branch circuit breaker switching values and analog quantity signals obtained through communication are judged to be of load properties or power supply properties, the relevant distribution network branches are output to the frequency voltage emergency control action program module 4, and on the other hand, the tripping signals of the distribution network branch circuit breakers output by the frequency voltage emergency control action program module 4 are received and are transmitted to the corresponding distribution network intelligent terminals.
The embodiment also provides an emergency control system for the adaptive frequency voltage of the electric power system, which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the emergency control method for the adaptive frequency voltage of the electric power system.
Referring to fig. 7, the microprocessor is further connected with an intra-station and inter-station communication module 5, where the intra-station and inter-station communication module 5 is configured to communicate with each branch intelligent terminal of the distribution network connected to the outside of the transformer substation through wired or wireless transmission, and is configured to obtain a transformer substation control layer packet from the communication, send a trip signal to the intelligent terminal of the distribution network corresponding to the branch of the distribution network, and obtain a trip execution result returned by the intelligent terminal of the distribution network. The intra-station and inter-station communication module 5 is used for communicating with an extra-station distribution network terminal to acquire distribution network branch tide information and breaker states connected with the transformer substation. The intra-station communication module 5 is configured to communicate with each branch intelligent terminal of the distribution network connected to the outside of the transformer substation in a wired or wireless transmission manner, such as an optical fiber communication manner, a power carrier communication manner, a wireless private network communication manner, and the like, on one hand, segments the distribution network obtained by communication, and switch value and analog quantity signals of the branch circuit breakers, on the other hand, judge that the branch of the related distribution network is load property or power property by using judgment logic recorded by the adaptive frequency-voltage emergency control method of the power system, identify the branch by a flag bit, output a signal to an adaptive load shedding unit of the frequency-voltage emergency control action module, and on the other hand, receive the tripping signal of the branch circuit breaker of the distribution network output by the frequency-voltage emergency control action module and send the tripping signal to the corresponding intelligent terminal of the distribution network.
The present embodiment also provides a computer readable storage medium having stored therein a computer program/instructions programmed or configured to execute the power system adaptive frequency voltage emergency control method by a processor.
The present embodiment also provides a computer program product comprising a computer program/instructions programmed or configured to execute the power system adaptive frequency voltage emergency control method by a processor.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (10)
1. An emergency control method for adaptive frequency voltage of an electric power system, comprising:
step S101, performing data acquisition, including: analog quantity acquisition is carried out on voltage analog quantity signals of bus voltage of the transformer substation, and outgoing line interval data acquisition is carried out on messages of a substation control layer of the transformer substation;
step S102, processing the acquired data, including: carrying out electrical characteristic quantity analysis on the acquired voltage analog quantity signal of the bus voltage of the transformer substation to extract frequency and amplitude, and carrying out outlet interval property judgment on the acquired outlet interval data to determine that the corresponding line property is a power supply or a load;
step S103, performing a frequency voltage emergency control action, including: and comparing the frequency and amplitude of the bus voltage of the transformer substation and the change rate of the bus voltage with a set constant value item to determine the action turn of the emergency control action of the current frequency voltage, and carrying out wire outlet interval property according to the corresponding action turn and wire outlet interval data to realize load shedding by cutting off branch loads of the distribution network preferentially on the premise of meeting the total load quantity of the cut-off interval specified by a constant value list.
2. The method for emergency control of adaptive frequency and voltage of a power system according to claim 1, wherein the step S101 of collecting outgoing line interval data of a substation control layer message includes:
step S201, initializing the total number N of outlet intervals max ；
Step S202, initializing a circulation variable N for traversing the wire outlet interval;
step S203, starting data acquisition of an Nth outlet interval, and setting a Flag bit flag_e to 1;
step S204, judging whether the communication between the Nth wire outlet interval N and the wire outlet interval data acquisition unit is normal and the data is valid, if so, entering step S205, and if not, entering step S206;
step S205, reading interval data of an Nth outlet interval, specifically electric quantity and switching value data output by a maintenance integrated device corresponding to the Nth outlet interval, and then entering step S206;
step S206, setting flag_e to 0;
step S207, sending the acquired interval data to a back-end module;
step S208, adding 1 to the cyclic variable N;
step S209, judging whether the cycle variable N is less than or equal to the total number of outlet intervals N max If yes, go to step S210, otherwise go to step S202;
step S210: after the delay time T seconds, the process proceeds to step S203.
3. The method for emergency control of adaptive frequency voltage in an electric power system according to claim 1, wherein step S101 is preceded by initializing an active characteristic flag bit loadp_n of 1 for any nth line outlet interval when initializing a program after powering up the device; in step S102, when the wire outlet interval property determination is performed on the collected wire outlet interval data to determine that the corresponding wire property is the power source or the load, performing the wire outlet interval property determination for any nth wire outlet interval to determine that the corresponding wire property is the power source or the load includes:
step S301, extracting active power P from outlet interval data acquired at an nth outlet interval;
step S302, if the active power P is larger than 0, outputting an active characteristic flag bit Loadp_n with a value of 1 to indicate that the line property corresponding to the nth outlet interval is a load, ending and exiting; otherwise, step S303 is entered;
step S303, judging whether the active power P extracted from the outlet interval data acquired at the nth outlet interval within the continuous appointed time period is smaller than 0, if so, initializing the nth outlet interval to set the corresponding active characteristic flag bit Loadp_n as 0, and outputting the value as 0 to indicate that the corresponding line property of the nth outlet interval is the active characteristic flag bit Loadp_n of the power supply.
4. The method according to claim 1, wherein the step S102 of analyzing the electrical characteristic of the collected voltage analog signal of the bus voltage of the substation to extract the frequency and the amplitude comprises: the three-phase alternating current signals are converted into a vector rotation space coordinate system by utilizing the coordinate transformation on the acquired voltage analog quantity signals of the bus voltage of the transformer substation; and extracting the frequency signal of the bus voltage of the transformer substation by adopting a proportional integral controller from the voltage analog quantity signal under the vector rotation space coordinate system, and obtaining the phase signal of the bus voltage of the transformer substation by integrating the frequency signal of the bus voltage of the transformer substation to be used for coordinate transformation from the three-phase alternating current signal to the vector rotation space coordinate system.
5. The method according to claim 1, wherein when the load shedding is realized by cutting off the branch load of the distribution network preferentially on the premise of meeting the total load of the cut-off interval specified by the fixed value list according to the corresponding action round and the line-out interval data in step S103, the load shedding is realized by cutting off the branch load of the distribution network preferentially on the premise of meeting the total load of the cut-off interval specified by the fixed value list according to any ith action round, wherein the step S103 comprises:
step S401, according to a preset device setting value, calculating the effective removable load power sum corresponding to the in-station wire outlet interval to be removed in the action round according to the following formula:
P_total＝∑P j *Loadp_j，
in the above description, P_total is the sum of the effective removable load power corresponding to the inter-station wire outlet interval to be removed in the current operation cycle, P j For active power before interval faults to be removed in the jth action round, loadp_j is an active characteristic flag bit of which the line property corresponding to the jth outlet interval is a load, wherein the active characteristic flag bit is 1 for representing the load and 0 for representing the power supply; j is the outlet interval number of the ith action round;
step S402, discharging a distribution network branch of the power supply network from all distribution network branches of the transformer substation as a candidate distribution network branch; initializing a circulation variable m for traversing candidate distribution network branches to be equal to 1, and accumulating distribution network branch load power Pd_total to be the load power corresponding to the 1 st distribution network branch;
step S403, judging whether the accumulated distribution network branch load power Pd_total is larger than the effective removable load power sum P_total corresponding to the in-station wire outlet interval to be removed in the current operation turn, if not, adding 1 to the circulation variable m, accumulating the load power corresponding to the new mth distribution network branch into the accumulated distribution network branch load power Pd_total, and entering step S403; otherwise, go to step S404;
step S404, recording 1 st to m th distribution network branches participating in accumulation of the load power Pd_total of the distribution network branches, and sending tripping commands to the 1 st to m th distribution network branches;
step S405, judging whether the 1 st to m th distribution network branch tripping is successful or not according to the switching state of the distribution network branch circuit breaker returned by the communication module inside and outside the station, if so, ending the load shedding operation of the round and exiting; otherwise, tripping out the outlet interval with the active characteristic zone bit of 1 in the range of the current action turn in the station, and ending the current turn load shedding action.
6. An adaptive frequency voltage emergency control system for an electrical power system, comprising:
the data acquisition program module (1) is used for carrying out data acquisition and comprises an outgoing line interval data acquisition program unit (11) and an analog quantity acquisition program unit (12), wherein the outgoing line interval data acquisition program unit (11) is used for carrying out outgoing line interval data acquisition on a transformer substation control layer message, and the analog quantity acquisition program unit (12) is used for carrying out analog quantity acquisition on a voltage analog quantity signal of a transformer substation bus voltage;
the system comprises an acquisition data processing program module, a power supply and a power supply, wherein the acquisition data processing program module is used for carrying out acquisition data processing and comprises an outlet interval property judging program module (2) and an electrical characteristic quantity analyzing program module (3), the outlet interval property judging program module (2) is used for carrying out outlet interval property judgment on acquired outlet interval data so as to determine that the corresponding line property is a power supply or a load, and the electrical characteristic quantity analyzing program module (3) is used for carrying out electrical characteristic quantity analysis on a voltage analog quantity signal of the acquired transformer substation bus voltage so as to extract frequency and amplitude;
the frequency voltage emergency control action program module (4) is used for executing the frequency voltage emergency control action and comprises an action round judging program unit (41) and an adaptive load shedding program unit (42), wherein the action round judging program unit (41) is used for comparing the frequency and the amplitude of the bus voltage of the transformer substation and the change rate of the frequency voltage emergency control action with a set constant value item to determine the action round of the current frequency voltage emergency control action, and the adaptive load shedding program unit (42) is used for realizing load shedding by cutting off the branch load of the distribution network on the premise that the total load of the cut-off interval specified by the constant value item is met according to the corresponding action round.
7. An electrical power system adaptive frequency voltage emergency control system comprising a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to perform the electrical power system adaptive frequency voltage emergency control method of any one of claims 1 to 5.
8. The power system self-adaptive frequency voltage emergency control system according to claim 7, wherein the microprocessor is further connected with an intra-station and inter-station communication module (5), and the intra-station and inter-station communication module (5) is used for communicating with each branch intelligent terminal of a distribution network connected outside the transformer substation through wired or wireless transmission, for obtaining a transformer substation station control layer message through communication, sending a trip signal to the corresponding intelligent terminal of the distribution network branch, and obtaining a trip execution result returned by the intelligent terminal of the distribution network.
9. A computer readable storage medium having stored therein a computer program/instruction, characterized in that the computer program/instruction is programmed or configured to execute the power system adaptive frequency voltage emergency control method according to any one of claims 1 to 5 by a processor.
10. A computer program product comprising computer program/instructions, characterized in that the computer program/instructions are programmed or configured to execute the power system adaptive frequency voltage emergency control method according to any one of claims 1 to 5 by a processor.
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