CN109038566B - Method for evaluating enforceability of current value strategy of power system safety and stability control device - Google Patents
Method for evaluating enforceability of current value strategy of power system safety and stability control device Download PDFInfo
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Abstract
The invention discloses a method for evaluating the feasibility of a current value strategy of a safety and stability control device of a power system, which comprises the steps of establishing a control strategy relation model of the safety and stability control device; determining a current value strategy of each expected failure or overload monitoring device defended in the safety and stability control device; determining the switching-allowed state of each candidate control measure; determining actual control quantity of current value strategies of various expected failure or overload monitoring equipment defended by each set of control device and a corresponding control measure set to be executed; merging the required control quantity and the actual control quantity of the current value strategy of each expected fault or overload monitoring device defended by each set of device according to whether the control device or the execution device adopts double-set configuration in the same plant station; determining the implementable state of each type of control measure of the current value policy, and determining the implementable state of the current value policy of each expected fault or overload monitoring device on the basis of the implementable state. The invention improves the intelligent level of online monitoring and early warning of the safety and stability control device of the power system.
Description
Technical Field
The invention belongs to the technical field of electric power system dispatching automation, and relates to a method for evaluating the feasibility of a current value strategy of a safety and stability control device of an electric power system.
Background
Along with the gradual construction of a large remote large-capacity alternating current-direct current hybrid power grid and the large-scale consumption of clean energy, the power grid structure is increasingly complex, and the operation mode and the safety and stability characteristics of the power grid are more complex and changeable. Meanwhile, in order to improve the consumption level of new energy and the large-range long-distance transmission capacity, the operation of a power transmission channel of the power grid is closer to a stable limit state, so that the problem of safety and stability of part of power grids is more serious.
The 'three defense lines' of the power system are precious experiences for guaranteeing the safe and stable operation of the power grid in China, the safety and stability control device is main automatic control equipment in the second defense line, and when the power system is disturbed by serious faults, the safety and stability control device adopts stability control measures such as generator tripping and load shedding to keep the power grid stably operating. During the construction transition period of the power grid structure, the safety and stability control device can be deployed to maintain the safety and stability of the power grid after the fault with small control cost. Therefore, whether the control strategy of the safety and stability control device can be executed correctly and sufficiently is important for guaranteeing the safe and stable operation of the power grid.
The document, "simulation method for actions of safety and stability control device based on structured model drive" (application number: 2010102131606) provides a structured modeling method for control strategy of safety and stability control device of electric power system, which expresses the stability control strategy in the form of (fault, operation mode, power flow level, control strategy) quaternary table structure, and decomposes the control strategy into five basic elements of control mode, control quantity implementation principle, control object queue and constraint for structured description, thereby realizing the simulation of actions of the safety and stability control device. The method has the main advantages that the strategy model has clear structure, but has poor expansibility, and cannot comprehensively adapt to the customization requirement of the control strategy of the safety and stability control device.
Document two, a power system security control strategy simulation system and a simulation method thereof (application number: 201410844016.0), provides a power system security and stability control strategy simulation system and a simulation method thereof based on a script analysis technology. The method describes and analyzes the control strategy of the safety automatic device of the power system based on a mode description language of the power system, and realizes the simulation of the control strategy logic and action behavior of the power system through modules such as state simulation, fault simulation, logic execution, communication interface and the like. The method has the main advantages that the strategy model has good expansibility, can flexibly describe various customized strategies based on the script language, and is relatively complex to maintain.
Disclosure of Invention
The invention aims to provide a method for evaluating the feasibility of the current value strategy of the safety and stability control device of the power system aiming at the limitations of the control strategy modeling and simulation technology of the existing safety and stability control device of the power system, which not only can realize the unified description of the stability control strategy, the identification of the current value strategy and the simulation of action behaviors, but also can evaluate whether the action results are in line with expectations or not, thereby effectively improving the intelligent level of online monitoring and early warning of the safety and stability control device of the power system.
The invention integrates the advantages of the two methods, analyzes and summarizes various constituent elements and key characteristics of the control strategy, refines the basic constituent unit of the control strategy based on the structural design idea, defines various customized constraint and control quantity formulas by adopting an expression description mode, comprehensively considers the selection logic and action export mode of double sets of control strategies of the safety and stability control device configured in the same station, and further realizes the operation risk identification and early warning of the current value strategy of the safety and stability control device on the basis.
The invention discloses a method for evaluating the implementability of a current value strategy of a safety and stability control device of a power system, which comprises the following steps of:
1) based on a power system safety and stability control device specification (the safety and stability control device specification refers to a technical specification document for describing the functional composition, the strategy logic and the implementation logic of the safety and stability control device in detail), a strategy table and a fixed value sheet, carrying out standardized description on a control strategy in a power grid dispatching automation system, establishing a control strategy relation model of the safety and stability control device, and entering a step 2);
2) analyzing and matching the control strategy relation model established in the step 1) based on the operation condition of primary equipment of the power system and the operation state of the safety and stability control device, determining the current value strategy of each expected failure or overload monitoring device defended in the safety and stability control device, and entering the step 3);
3) the power system safety and stability control device comprises a control device and an execution device, the switching permission state of each candidate control measure is determined based on the operation states of the control device and the execution device and the operation working conditions of the primary equipment of the associated power system, and the step 4 is entered;
4) determining the actual control quantity of each expected fault or overload monitoring device defended by each set of control device and a corresponding control measure set to be executed based on the required control quantity and control constraint conditions of the current value strategy, the permission-switching state and control priority of the candidate control measures and the operation condition of primary equipment of the power system, judging whether the control device or the execution device adopts double-set configuration in the same plant station, and if so, entering step 5); otherwise, entering step 6);
5) according to the operation mode and the action outlet connection mode of double sets of configuration control devices or execution devices in the same plant station, merging the required control quantity and the actual control quantity of the current value strategy of each expected fault or overload monitoring device defended by each set of device, and entering step 6);
6) and determining the implementable state of each type of control measure of the current value strategy according to the actual control quantity and the required control quantity of each type of control measure in the current value strategy of the expected fault or overload monitoring device, and determining the implementable state of each expected fault or overload monitoring device based on the implementable state of each type of control measure.
In the step 1), a control strategy relation model of the safety and stability control device comprises a control strategy, an execution strategy and a control measure;
the control strategy comprises seven components of mode constraint, fault constraint, power flow constraint, strategy turn, control strategy expression, priority formula and rules thereof and control constraint;
the execution strategy comprises five components of a control type, a control quantity type, an execution strategy expression, a priority formula and a rule and an execution constraint thereof;
the control measures comprise control types, control quantity types, priority formulas and rules thereof, measure constraints, associated power system primary equipment and action execution time composition elements;
the mode constraint, the fault constraint, the power flow constraint, the control constraint, the execution constraint, the measure constraint, the control strategy expression, the execution strategy expression and the priority formula present differentiated characteristics in different safety and stability control devices, and are uniformly described through a formula consisting of a series of keywords, logical operators, arithmetic operators and relational operators on the basis of the operation condition of primary equipment of the power system, the operation state of the safety and stability control devices and the strategy setting value so as to meet the description requirement of the control strategy customized characteristics; the constituent elements of the control strategy expression also support control strategies, execution strategies and control measures; the constituent elements of the execution policy expression also support execution policies and control measures.
In the step 2), based on the operation state of the power system safety and stability control device and the operation condition of the power system primary equipment, identifying a control strategy in which a mode constraint, a power flow constraint and a control constraint formula are simultaneously established in a control strategy set of each expected fault or overload monitoring device of the safety and stability control device; arranging the control strategies according to strategy turns, and determining the control strategy corresponding to the current turn of the current value strategy according to the turns executed by the control device; analyzing each control strategy, execution strategy or control measure space and corresponding required control quantity contained in the control strategy from the control strategy expression of the control strategy; and resolving a candidate control measure space containing various control measure types and corresponding control demand according to the priority of the control strategy and the execution strategy.
In step 3), monitoring equipment current value strategy F for expected faults or overloadjThe cut-through state of the ith candidate control measure of (1) is described uniformly,
wherein A isiDevice current value policy F is monitored for anticipatory failures or overloadsjThe ith candidate control measure of (1), R (F)j,Ai) Policy F for current valuejAn admission status of an ith candidate control measure;
policy F for identifying expected failure or overload monitoring device current value in stability control systemjThe associated control means are arranged to control the operation of the motor,
for the ith candidate control measure A in the stability control systemiThe execution device is a device to be executed,
for control devices
And an execution device
The communication state of the command channel between the two devices comprises the communication state of the whole control link which is relayed and forwarded by other devices in the middle;
for the ith candidate control measure A in the stability control systemiAssociating the switching state of the pressure-allowing plate;
for the ith candidate control measure A in the stability control systemiAssociating the on-off state of the outlet pressing plate; z (A)i) For the ith candidate control measure A in the stability control systemiWhether the current active power exceeds the allowable threshold power fixed value mark or not;
R(Fj,Ai) A value of 1 indicates the current value policy FjIth candidate control action AiIn the cut-allowing state, the value is 0 to indicate when the value strategy FjIth candidate control action AiIn an uncontrollable state;
a value of 1 indicates a control device
And an execution device
The command channel is in a normal communication state, and the value of 0 indicates that the command channel is in abnormal communicationA state;
and
the value of (1) respectively represents the ith candidate control measure A in the stability control systemiThe associated pressure plate allowing cutting and the outlet pressure plate are in the input state, and when the value is 0, the pressure plate allowing cutting and the outlet pressure plate respectively represent the ith candidate control measure A in the stable control systemiThe associated pressure plate allowing cutting and the outlet pressure plate are in an exit state; z (A)i) A value of 1 indicates the ith control measure candidate A in the stability control systemiThe active power is more than or equal to the allowable cut threshold power fixed value, and the value of 0 represents the ith candidate control measure A in the stability control systemiThe active power of the power converter is smaller than a permitted threshold power fixed value;
the stability control system is composed of a control device and an execution device, wherein the control device and the execution device are respectively one or more, and the control device can be simultaneously used as the execution device.
The ith candidate control measure in the stability control system is in the allowed state and is only satisfied when the following four conditions are simultaneously satisfied:
(a) the active power of the ith candidate control measure associated equipment i is larger than the fixed value of the operation power of the ith candidate control measure associated equipment i;
(b) the ith candidate control measure is associated with the allowable cutting pressure plate to be in an input state;
(c) the ith candidate control measure is associated with the outlet pressure plate in a putting state;
(d) control device DFAnd an execution device
The command channel in between is in a normal communication state.
In step 4), the current value strategy respectively appoints the required control quantity for each candidate measure space according to the control measure type, each type of control measure is respectively arranged in the candidate measure space according to the control priority order, the candidate control measure is sequentially selected according to the required control quantity appointed by the control measure type of the current value strategy, whether the candidate control measure meets the control constraint condition is judged, if yes, the candidate control measure is added into the control measure type action measure set of the current value strategy, the actual control quantity of the control measure type is counted, if the control quantity calculation type is the minimum undercut principle, the actual control quantity needs to be counted on the basis of the allowable cut quantity of all action measures, the maximum allowable undercut power threshold value is added, and the actual control quantity is larger than or equal to the required control quantity or the traversal of all candidate control measures of the type is completed.
In the step 5), the required control quantity and the actual control quantity of each control measure type of the current value strategy of the double sets of control devices in the same station in a stable control system are combined according to the formulas (2) and (3);
the control quantity required and the actual control quantity of various control measure types of the current value strategy of the double sets of control devices in the same plant station are combined according to the formulas (4) and (5) in the parallel operation mode;
Nc(Fj)＝max{N1c(Fj),N2c(Fj)},((M1＝2)&&(M2＝2) (4)
wherein N isc(Fj) Strategy F for stabilizing current value of systemjThe control demand of the class c control measure represents the current value strategy FjThe sum of the control quantities required to perform the type c control action; xc(Fj) Strategy F for stabilizing current value of systemjActual control quantity of class c control measure, which represents current value strategy FjAll control measures of class c actually executedThe sum of the control amounts of (1); n1c(Fj)、N2c(Fj) Current value strategies F of a first set and a second set of safety and stability control devices in a stability control system respectivelyjThe amount of control required for the type c control measure; x1c(Fj)、X2c(Fj) Current value strategies F of a first set and a second set of safety and stability control devices in a stability control system respectivelyjActual control quantity to be executed by the c-th control measure; m1 and M2 are respectively the operation modes of a first set and a second set of safety and stability control devices in the stability control system; l1 and L2 are respectively the connection mode of the action signal outlets of the first set and the second set of safety and stability control device in the stability control system; X1Sc(Fj)、X2Sc(Fj) Current value strategies F of a first set and a second set of safety and stability control devices in a stability control system respectivelyjA set of actions to be performed by the class c control action; x (A)k) For control measures A of type ckThe actual control amount of (a);
a value of 0 for M1 and M2 indicates that the first and second sets of devices are in secondary mode of operation, respectively; a value of 1 indicates that the first and second sets of devices are in primary mode of operation, respectively; a value of 2 indicates that the first and second sets of devices are in a parallel mode of operation, respectively; l1, wherein the value of L2 is 1, which indicates that the action signal outlets of the first set and the second set of safety and stability control devices in the stability control system are connected in parallel; the value of 2 indicates that the action signal outlets of the first set and the second set of safety and stability control devices in the stability control system are connected in series.
Step 6), anticipating failure or overload monitoring device current value policy FjThe implementable states of the class c control measures are uniformly described according to a formula (6); device current value policy F for anticipatory failure or overload monitoringjThe implementable states of (a) are described uniformly according to formula (7);
S(Fj)＝max{Sc(Fj),1≤c≤cnum(Fj)} (7)
wherein，Sc(Fj) Device current value strategy F for monitoring predicted faults or overload in stability control systemjAn enforceable status of a type c control measure; PM (particulate matter)c(Fj) Device current value strategy F for monitoring predicted faults or overload in stability control systemjThe maximum allowable under-cut power threshold value of the c type control measure; c. Cnum(Fj) Policy F for current valuejThe number of types of control measures involved; s (F)j) Device current value strategy F for monitoring predicted faults or overload in stability control systemj(ii) an implementable state of;
the control measure types comprise unit cutting, load cutting and direct current adjustment;
Sc(Fj) Is when value policy FjAn enforceable state for the class c control measure, a value of 0 indicating that it is in a no control needed state; a value of 1 indicates that it is in a state where the control amount is sufficient; a value of 2 indicates that it is in a control amount insufficient state;
S(Fj) Policy F for current valuejThe comprehensive control method comprises the total implementable state of various control measures, and the value of 0 represents that the control method is in a control-free state; a value of 1 indicates that the control amount is sufficient; a value of 2 indicates that the control amount is insufficient.
The invention is based on the idea of standardized modeling, establishes a relational model for the control strategy of a safety and stability control device according to mode constraint, fault constraint, power flow constraint, control strategy, execution strategy, control measure and control constraint, and uniformly describes the running state and strategy fixed value of each component element of the safety and stability control device based on primary equipment of a power system and a strategy fixed value through a formula which is composed of a series of keywords, a logical operator, an arithmetic operator and a relational operator and supports syntax analysis so as to meet the requirement of control strategy customization characteristics. On the basis, the actual operation working conditions of the power grid equipment and the safety and stability control device are combined, the on-line identification of the current value control strategy of the safety and stability control device is realized, whether the action result of the current value control strategy accords with the expectation is evaluated on line, and the operation risk that the current value strategy of the safety and stability control device cannot be executed in sufficient quantity is identified and early warned in advance. Therefore, the invention can further realize the online identification and early warning of the current value strategy operation risk of the safety and stability control device on the basis of realizing the unified description and action simulation of the control strategy of the safety and stability control device, thereby effectively improving the intelligent level of the online monitoring and operation management of the safety and stability control device.
Drawings
FIG. 1 is a flow chart of the operation of one embodiment of the method of the present invention;
FIG. 2 is a schematic diagram of a control strategy relationship model.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The basic principle of the invention is that: the method comprises the steps of carrying out unified modeling on a control strategy and action logic of a safety and stability control device (specifically comprising a control device and an execution device, the same below) of the power system, carrying out structural description on standardized features and incidence relations of the control strategy and the action logic, describing customized features and incidence relations by adopting expressions, carrying out current value strategy identification and action behavior simulation based on the actual operation condition of a power grid and the operation state of the safety and stability control device, further evaluating whether the action result of the control strategy meets the requirement of a required control quantity of the current value strategy on the basis, and realizing online identification and early warning on the current value strategy operation risk of the safety and stability control device.
Referring to fig. 1, the specific working steps are as follows:
1) based on a specification (technical description document for describing the functional composition, the strategy structure and the implementation logic of the safety and stability control device), a strategy table and a fixed value list of the safety and stability control device (a stability control device for short, specifically comprising a control device and an execution device) of the power system, standardized description is carried out on the control strategy in a power grid dispatching automation system, and a control strategy relation model of the safety and stability control device is established.
Referring to fig. 2, the control strategy relationship model of the safety and stability control device is divided into three parts, namely a control strategy, an execution strategy and a control measure. The control strategy comprises mode constraint, fault constraint, power flow constraint, strategy turn, control strategy expression, priority formula and its rule (for describing execution sequence among multiple control strategies), and control constraint component elements; the execution strategy comprises a control type (used for describing whether the control strategy expression defines the total quantity of control measures needing to be executed or the total quantity of the control measures needing to be reserved after the execution, the same below), a control quantity type (used for describing whether the control quantity defined by the control strategy expression is active power, the number of generator sets, a cutting proportion or binary logic judgment, the same below), an execution strategy expression, a priority formula and a rule thereof, and an execution constraint component element; the control measures comprise the components of control types, control quantity types, priority formulas and rules thereof, measure constraints, associated power system primary equipment, action execution time and the like. The mode constraint, the fault constraint, the power flow constraint, the control constraint, the execution constraint, the measure constraint, the control strategy expression, the execution strategy expression, the priority formula and the like present differentiated characteristics in different safety and stability control devices, and operation information and strategy fixed values such as operation conditions of primary equipment of a power system, switching states of various pressing plates of the safety and stability control devices, communication states of channels, abnormal signals and the like are uniformly described through a formula consisting of a series of keywords, logical operators, arithmetic operators and relational operators so as to meet the control strategy customized characteristic description requirements. The constituent elements of the control strategy expression also support control strategies, execution strategies and control measure spaces; the constituent elements of the execution policy expression also support the execution policy and control measure space.
2) Analyzing and matching the control strategy relation model of the safety and stability control device obtained in the step 1) based on the operation condition of primary equipment of the power system, the operation state of the safety and stability control device and related strategy fixed values, and searching out all control strategies meeting mode constraints, power flow constraints and control constraints of each expected fault or overload monitoring device defended by the control device; on the basis, a candidate control measure space containing various control measure types and corresponding control demand of each expected fault or overload monitoring equipment current value strategy are further analyzed.
When strategy analysis is carried out, firstly, control strategies are grouped according to expected faults or overload monitoring equipment in a stability control strategy model, expressions such as mode constraint, power flow constraint, control constraint and the like related to each strategy in a control strategy set of each expected fault or overload monitoring equipment are analyzed, then, control strategies with all satisfied stability control strategy related constraint conditions are identified according to the operation condition of primary equipment of a power system, the operation state of a safety and stability control device and related strategy fixed value information, the control strategies are arranged according to strategy turns, and the control strategy corresponding to the current turn of the current value strategy is determined according to the turns executed by the control device; analyzing each control strategy, execution strategy or control measure space and corresponding required control quantity contained in the control strategy from the control strategy expression of the control strategy; and resolving a candidate control measure space containing various control measure types and corresponding control demand according to the priority of the control strategy and the execution strategy.
3) And identifying the allowable switching states of all candidate measures associated with each current value control strategy of the stabilizing device obtained in the step 2) based on the operating condition of the primary equipment of the power system and the operating state of the safety and stability control device. The switching allowing state of each candidate control measure of the safety and stability control device and the command channel state between the devices, the switching on/off states of the corresponding switching allowing pressing plate and the corresponding outlet pressing plate of the control measure and the running power of the primary equipment of the power system related to the current control measure are related, and the identification and the judgment can be specifically carried out according to a formula (1).
Wherein A isiDevice current value policy F is monitored for anticipatory failures or overloadsjThe ith candidate control measure of (1), R (F)j,Ai) A current value strategy F for the stability control systemjAn admission status of an ith candidate control measure;
policy F for identifying expected failure or overload monitoring device current value in stability control systemjThe associated control means are arranged to control the operation of the motor,
for the ith candidate control measure A in the stability control systemiThe execution device is a device to be executed,
for control devices
And an execution device
The communication state of the command channel between the two devices comprises the communication state of the whole control link which is relayed and forwarded by other devices in the middle;
for the ith candidate control measure A in the stability control systemiAssociating the switching state of the pressure-allowing plate;
for the ith candidate control measure A in the stability control systemiAssociating the on-off state of the outlet pressing plate; z (A)i) For the ith candidate control measure A in the stability control systemiWhether the current active power exceeds the allowed threshold power fixed value mark.
The ith candidate control measure in the stability control system is in a permitted state and is only satisfied when the following three conditions are simultaneously met:
(a) the active power of the ith candidate control measure associated equipment i is larger than the fixed value of the operation power of the ith candidate control measure associated equipment i;
(b) the ith candidate control measure is associated with the allowable cutting pressure plate to be in an input state;
(c) the ith candidate control measure is associated with the outlet pressure plate in a putting state;
(d) control device DFAnd an execution device
The command channel in between is in a normal communication state.
4) Determining the allowable switching amount of each candidate control measure based on the allowable switching state of the candidate control measures identified in the step 3) and the operation condition of the primary equipment of the associated power system, and then determining a specific action measure set to be executed corresponding to the current value strategy of each set of device defense for each expected fault or overload monitoring equipment according to the required control amount, the control constraint condition and the priority of each candidate control measure.
The current value strategy respectively appoints the required control quantity for each candidate measure space according to the control measure type, each type of control measure is respectively arranged in the candidate measure space according to the control priority order, the candidate control measure is sequentially selected according to the required control quantity appointed by the control measure type of the current value strategy, whether the candidate control measure meets the control constraint condition is judged, if yes, the candidate control measure is added into the control measure type action measure set of the current value strategy, and the actual control quantity of the control measure type is counted (if the calculation type of the control quantity is the minimum under-cut principle, the actual control quantity needs to be added with the maximum allowable under-cut power threshold value on the basis of counting the allowable under-cut quantity of all action measures) until the actual control quantity is more than or equal to the required control quantity or all candidate control traversal measures of the type are completed.
5) For the double-set configured safety and stability control device, if the double-set device is in a main and auxiliary operation mode, the required control quantity and the actual control quantity of the current value strategy of each expected fault or overload monitoring device are respectively merged according to a formula (2) and a formula (3); if the double sets of devices are in a parallel operation mode, the required control quantity and the actual control quantity of the current value strategy of each expected fault or overload monitoring device are respectively merged according to a formula (4) and a formula (5).
Nc(Fj)＝max{N1c(Fj),N2c(Fj)},((M1＝2)&&(M2＝2) (4)
Wherein N isc(Fj) Strategy F for stabilizing current value of systemjThe control demand of the class c control measure represents the current value strategy FjThe sum of the control quantities of all the control measures of the type c needs to be executed; xc(Fj) Strategy F for stabilizing current value of systemjActual control quantity of class c control measure, which represents current value strategy FjThe sum of the control quantities of all the control measures of the c-th class which are actually executed; n1c(Fj)、N2c(Fj) Respectively a first set and a second set of safety and stability control device current value strategy F in the stability control systemjThe amount of control required for the type c control measure; x1c(Fj)、X2c(Fj) Respectively a first set and a second set of safety and stability control device current value strategy F in the stability control systemjActual control quantity to be executed by the c-th control measure; m1 and M2 are respectively the operation modes of a first set and a second set of safety and stability control devices in the stability control system; l1 and L2 are respectively the connection mode of the action signal outlets of the first set and the second set of safety and stability control device in the stability control system; X1Sc(Fj)、X2Sc(Fj) Respectively a first set and a second set of safety and stability control device current value strategy F in the stability control systemjA set of actions to be performed by the class c control action; x (A)k) For action AkThe actual control quantity of (2).
A value of 0 for M1 and M2 indicates that the first and second sets of devices are in secondary mode of operation, respectively; a value of 1 indicates that the first and second sets of devices are in primary mode of operation, respectively; a value of 2 indicates that the first and second sets of devices are in parallel operating mode, respectively. L1, wherein the value of L2 is 1, which indicates that the action signal outlets of the first set and the second set of safety and stability control devices in the stability control system are connected in parallel; the value of 2 indicates that the action signal outlets of the first set and the second set of safety and stability control devices in the stability control system are connected in series.
Specifically, for the dual-set device in the main and auxiliary operation mode, the operation signal outlets are connected in parallel, and the specific control demand and actual operation measure set is shown in table 1.
TABLE 1 Dual-device current-value policy merge logic in primary and secondary modes of operation
For the double-set device in the parallel operation mode, the action signal outlets are divided into a parallel connection mode and a series connection mode, and the specific quantity control and actual action measures are shown in table 2.
TABLE 2 double-set device current value strategy merging logic in parallel operation mode
6) And determining the implementable state of each type of control measure in the current value strategy of the current value strategy based on the implementable amount and the required control amount of each type of control measure in the current value strategy of each expected fault or overload monitoring device identified in the step 5, and determining the implementable state of each expected fault or overload monitoring device current value strategy based on the implementable state of each type of control measure.
The control measure types mainly comprise unit cutting, load cutting and direct current adjustment. And for the current value strategies which respectively specify the required control quantity according to the types of the control measures, the implementable states of each type of the control measures are respectively identified according to a formula (6), and then the implementable states of the various types of the control measures are combined according to a formula (7).
S(Fj)＝max{Sc(Fj),1≤c≤cnum(Fj)} (7)
Wherein S isc(Fj) Monitoring equipment current value strategy F for expected faults or overload in the stability control systemjAn enforceable status of a type c control measure; PM (particulate matter)c(Fj) Monitoring equipment current value strategy F for expected faults or overload in the stability control systemjThe maximum allowable under-cut power threshold value of the c type control measure; c. Cnum(Fj) Policy F for current valuejThe number of types of control measures involved; s (F)j) Monitoring equipment current value strategy F for expected faults or overload in the stability control systemjMay be implemented.
Sc(Fj) Is when value policy FjAn enforceable state for the class c control measure, a value of 0 indicating that it is in a no control needed state; a value of 1 indicates that it is in a state where the control amount is sufficient; a value of 2 indicates that it is in the control amount insufficient state.
S(Fj) Policy F for current valuejThe comprehensive control method comprises the total implementable state of various control measures, and the value of 0 represents that the control method is in a control-free state; a value of 1 indicates that the control amount is sufficient; a value of 2 indicates that the control amount is insufficient.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A method for evaluating the feasibility of a current value strategy of a safety and stability control device of a power system is characterized by comprising the following steps:
1) based on the specification of the safety and stability control device of the power system, a policy table and a fixed value list, carrying out standardized description on the control policy of the safety and stability control device in the power grid dispatching automation system, establishing a control policy relation model of the safety and stability control device, and entering the step 2);
in the step 1), a control strategy relation model of the safety and stability control device comprises a control strategy, an execution strategy and a control measure;
the control strategy comprises seven components of mode constraint, fault constraint, power flow constraint, strategy turn, control strategy expression, priority formula and rules thereof and control constraint;
the execution strategy comprises five components of a control type, a control quantity type, an execution strategy expression, a priority formula and a rule and an execution constraint thereof;
the control measures comprise control types, control quantity types, priority formulas and rules thereof, measure constraints, associated power system primary equipment and action execution time composition elements;
the mode constraint, the fault constraint, the power flow constraint, the control constraint, the execution constraint, the measure constraint, the control strategy expression, the execution strategy expression and the priority formula present differentiated characteristics in different safety and stability control devices, and are uniformly described through a formula consisting of a series of keywords, logical operators, arithmetic operators and relational operators on the basis of the operation condition of primary equipment of the power system, the operation state of the safety and stability control devices and the strategy setting value so as to meet the description requirement of the control strategy customized characteristics; the constituent elements of the control strategy expression also support control strategies, execution strategies and control measures; the constituent elements of the execution policy expression also support execution policies and control measures;
2) analyzing and matching the control strategy relation model established in the step 1) based on the operation condition of primary equipment of the power system and the operation state of the safety and stability control device, determining the current value strategy of each expected failure or overload monitoring device defended in the safety and stability control device, and entering the step 3);
in the step 2), based on the operation state of the power system safety and stability control device and the operation condition of the power system primary equipment, identifying a control strategy in which a mode constraint, a power flow constraint and a control constraint formula are simultaneously established in a control strategy set of each expected fault or overload monitoring device of the safety and stability control device; arranging the control strategies according to strategy turns, and determining the control strategy corresponding to the current turn of the current value strategy according to the turns executed by the control device; analyzing each control strategy, execution strategy or control measure space and corresponding required control quantity contained in the control strategy from the control strategy expression of the control strategy; resolving candidate control measure spaces of various control measure types and corresponding control demand according to the priority of the control strategy and the execution strategy;
3) the power system safety and stability control device comprises a control device and an execution device, the switching permission state of each candidate control measure is determined based on the operation states of the control device and the execution device and the operation working conditions of the primary equipment of the associated power system, and the step 4 is entered;
4) determining the actual control quantity of each expected fault or overload monitoring device defended by each set of control device and a corresponding control measure set to be executed based on the required control quantity and control constraint conditions of the current value strategy, the permission-switching state and control priority of the candidate control measures and the operation condition of primary equipment of the power system, judging whether the control device or the execution device adopts double-set configuration in the same plant station, and if so, entering step 5); otherwise, entering step 6);
in step 4), the current value strategy respectively appoints the required control quantity for each candidate measure space according to the control measure type, each type of control measure is respectively arranged in the candidate measure space according to the control priority order, the candidate control measure is sequentially selected according to the required control quantity appointed by the control measure type of the current value strategy, whether the candidate control measure meets the control constraint condition is judged, if yes, the candidate control measure is added into the control measure type action measure set of the current value strategy, the actual control quantity of the control measure type is counted, if the control quantity calculation type is the minimum under-cut principle, the actual control quantity needs to be counted on the basis of the allowable under-cut quantity of all action measures, the maximum allowable under-cut power threshold value is added, and the actual control quantity is larger than or equal to the required control quantity or all candidate control measure traversals of the type are completed;
5) according to the operation mode and the action outlet connection mode of double sets of configuration control devices or execution devices in the same plant station, merging the required control quantity and the actual control quantity of each expected fault or overload monitoring equipment current value strategy defended by each set of control device, and entering step 6);
in the step 5), the required control quantity and the actual control quantity of each control measure type of the current value strategy of the double sets of control devices in the same station in a stable control system are combined according to the formulas (2) and (3);
the control quantity required and the actual control quantity of various control measure types of the current value strategy of the double sets of control devices in the same plant station are combined according to the formulas (4) and (5) in the parallel operation mode;
Nc(Fj)＝max{N1c(Fj)，N2c(Fj)}，((M1＝2)&&(M2＝2) (4)
wherein N isc(Fj) Strategy F for stabilizing current value of systemjThe control demand of the class c control measure represents the current value strategy FjThe sum of the control quantities required to perform the type c control action; xc(Fj) Strategy F for stabilizing current value of systemjClass cActual control quantity of control measure, representing current value strategy FjThe sum of the control quantities of all the control measures of the c-th class which are actually executed; n1c(Fj)、N2c(Fj) Current value strategies F of a first set and a second set of safety and stability control devices in a stability control system respectivelyjThe amount of control required for the type c control measure; x1c(Fj)、X2c(Fj) Current value strategies F of a first set and a second set of safety and stability control devices in a stability control system respectivelyjActual control quantity to be executed by the c-th control measure; m1 and M2 are respectively the operation modes of a first set and a second set of safety and stability control devices in the stability control system; l1 and L2 are respectively the connection mode of the action signal outlets of the first set and the second set of safety and stability control device in the stability control system; X1Sc(Fj)、X2Sc(Fj) Current value strategies F of a first set and a second set of safety and stability control devices in a stability control system respectivelyjA set of actions to be performed by the class c control action; x (A)k) For control measures A of type ckThe actual control amount of (a);
a value of 0 for M1 and M2 indicates that the first and second safety and stability control devices are in the secondary mode, respectively; the value of M1 and M2 is 1, which indicates that the first set and the second set of safety and stability control device are in the main operation mode respectively; the value of M1 and M2 is 2, which respectively indicates that the first set and the second set of safety and stability control devices are in parallel operation mode; l1, wherein the value of L2 is 1, which indicates that the action signal outlets of the first set and the second set of safety and stability control devices in the stability control system are connected in parallel; the value of L1 and L2 is 2, which indicates that the action signal outlets of the first set and the second set of safety and stability control devices in the stability control system are connected in series;
6) determining the implementable state of each type of control measure of the current value strategy according to the actual control quantity and the required control quantity of each type of control measure in the current value strategy of the expected fault or overload monitoring equipment, and determining the implementable state of each expected fault or overload monitoring equipment current value strategy based on the implementable state of each type of control measure;
step 6), anticipating failure or overload monitoring device current value policy FjThe implementable state of the control measure of class c is according to the formula (6) Carrying out unified description; device current value policy F for anticipatory failure or overload monitoringjThe implementable states of (a) are described uniformly according to formula (7);
S(Fj)＝max{Sc(Fj)，1≤c≤cnum(Fj)} (7)
wherein S isc(Fj) Device current value strategy F for monitoring predicted faults or overload in stability control systemjAn enforceable status of a type c control measure; PM (particulate matter)c(Fj) Device current value strategy F for monitoring predicted faults or overload in stability control systemjThe maximum allowable under-cut power threshold value of the c type control measure; c. Cnum(Fj) Policy F for current valuejThe number of types of control measures involved; s (F)j) Device current value strategy F for monitoring predicted faults or overload in stability control systemj(ii) an implementable state of;
the control measure types comprise unit cutting, load cutting and direct current adjustment;
Sc(Fj) Is when value policy FjImplementable state of class c control measures, Sc(Fj) A value of 0 indicates that it is in a control-not-required state; a value of 1 indicates that it is in a state where the control amount is sufficient; sc(Fj) A value of 2 indicates that it is in a control amount insufficient state;
S(Fj) Policy F for current valuejSynthesizing its general implementable state containing various control measures, S (F)j) A value of 0 indicates that it is in a control-not-required state; s (F)j) A value of 1 indicates that the control amount is sufficient; s (F)j) A value of 2 indicates that the control amount is insufficient.
2. The method for evaluating the feasibility of the current value strategy of the safety and stability control device of the power system according to claim 1, wherein in the step 3), the current value strategy of the monitoring equipment for the expected failure or overload is evaluatedSlightly FjThe cut-through state of the ith candidate control measure of (1) is described uniformly,
wherein A isiDevice current value policy F is monitored for anticipatory failures or overloadsjThe ith candidate control measure of (1), R (F)j，Ai) Policy F for current valuejAn admission status of an ith candidate control measure;
policy F for identifying expected failure or overload monitoring device current value in stability control systemjThe associated control means are arranged to control the operation of the motor,
for the ith candidate control measure A in the stability control systemiThe execution device is a device to be executed,
for control devices
And an execution device
The communication state of the command channel between the two devices comprises the communication state of the whole control link which is relayed and forwarded by other devices in the middle;
for the ith candidate control measure A in the stability control systemiAssociating the switching state of the pressure-allowing plate;
for the ith candidate control measure A in the stability control systemiAssociatedThe on-off state of the outlet pressing plate; z (A)i) For the ith candidate control measure A in the stability control systemiWhether the current active power exceeds the allowable threshold power fixed value mark or not;
R(Fj，Ai) A value of 1 indicates the current value policy FjIth candidate control action AiIn a cut-allowing state, R (F)j，Ai) A value of 0 indicates when the value policy FjIth candidate control action AiIn an uncontrollable state;
a value of 1 indicates a control device
And an execution device
The command channel therebetween is in a normal communication state,
when the value is 0, the command channel is in a communication abnormal state;
and
the value of (1) respectively represents the ith candidate control measure A in the stability control systemiThe associated admission and exit platens are in the plunge state,
and
when the value is 0, the ith candidate control measure A in the stability control system is respectively representediThe associated shear-allowing platen and exit platen are in an exited state；Z(Ai) A value of 1 indicates the ith control measure candidate A in the stability control systemiActive power of more than or equal to the definite value of allowed threshold power, Z (A)i) The value of 0 represents the ith candidate control measure A in the stability control systemiThe active power of the power converter is smaller than a permitted threshold power fixed value;
the stability control system is composed of a control device and an execution device, wherein the control device and the execution device are respectively one or more, and the control device can be simultaneously used as the execution device.
3. The method for evaluating the feasibility of a value strategy according to claim 2, wherein the stability control system is established when the ith candidate control measure is in the allowable state only if the following four conditions are simultaneously satisfied:
(a) the active power of the ith candidate control measure associated equipment i is larger than the fixed value of the operation power of the ith candidate control measure associated equipment i;
(b) the ith candidate control measure is associated with the allowable cutting pressure plate to be in an input state;
(c) the ith candidate control measure is associated with the outlet pressure plate in a putting state;
(d) control device DFAnd an execution device
The command channel in between is in a normal communication state.
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