CN103746373A - Field verification method of high-capacity flexible alternating-current power transmission system control strategy - Google Patents
Field verification method of high-capacity flexible alternating-current power transmission system control strategy Download PDFInfo
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Abstract
The invention provides a field verification method of a high-capacity flexible alternating-current power transmission system control strategy. The field verification method covers three aspects, i.e. transition from an initial method to a testing method, disturbance of FACTS element action to grid voltage during testing and control strategy triggering, can coordinately determine a grid initial operating state, a grid operating state before strategy verification testing, a testing target grid operating state, a control strategy fixed value and grid disturbance operation, and can realize full-process control from the grid initial operating state to the testing target operating state. The field verification method of the high-capacity flexible alternating-current power transmission system control strategy can be used for performing field verification to coordinate control strategy of various high-capacity FACTS systems, can check whether elements can correctly act according to control strategy preset logics and conditions or not and can provide a basis for the stable operation of a power system.
Description
Technical field
The present invention relates to a kind of verification method, be specifically related to a kind of large capacity flexible AC transmitting system control strategy on-site verification method.
Background technology
Along with flexible AC transmitting system (FACTS) apply increasingly extensive, element volume is increasing, can FACTS system the pre-conditioned and logically true action according to control strategy, to power system safety and stability, operation has material impact.Control strategy on-site verification is the last operation examination on site before equipment formally puts into operation, and directly determines that can FACTS system bringing normally into operation.
Networking second channel in northwest-Xinjiang builds up the put into operation large capacity of world's 750kV electric pressure, many FACTS of polymorphic type system.About many FACTS system coordination control strategy, there is research more before this, but owing to lacking Project Realization, for control strategy on-site verification method, there is not yet report.
For large capacity, eurypalynous many FACTS system coordination control strategy on-site verification, " from initial mode to test method transition ", " test, the action of FACTS element is to grid disturbances " and " control strategy triggering " three aspects be need to consider simultaneously, electrical network initial mode, test previous mode, test objective mode, control strategy definite value and grid disturbance operation coordinated to determine.The in the situation that of conditions permit, the mode that should adopt as far as possible setting " system disturbance " to trigger control strategy completes, to be close to operation of power networks reality; Part emergency control policy just can be triggered under extremity, the serious out-of-limit condition of busbar voltage at electrical network, obviously be difficult to realize by disturbance, and the multistage continuous action of many FACTS system can form and impact system again after triggering, scheme that must be reasonable in design with guarantee test during operation of power networks within the scope of safe and reasonable.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of large capacity flexible AC transmitting system control strategy on-site verification method, can realize the Whole Process Control from electrical network initial mode to test objective mode, simultaneously according to operation of power networks condition, adopt " system disturbance " and the method that " modification definite value " combines, realize complete control strategy on-site verification.
In order to realize foregoing invention object, the present invention takes following technical scheme:
The invention provides a kind of large capacity flexible AC transmitting system control strategy on-site verification method, said method comprising the steps of:
Step 1: determine basic operation of power networks initial condition and flexible AC transmitting system control strategy definite value;
Step 2: determine final operation of power networks initial condition;
Step 3: determine the front operation of power networks state of basic control strategy demonstration test and test objective operation of power networks state;
Step 4: determine the front operation of power networks state of final control strategy demonstration test and test objective operation of power networks state;
Step 5: by grid disturbance is set, trigger control strategy;
Step 6: simulation calculation grid disturbance, and judge whether electrical network can bear grid disturbance, if realize by operation of power networks state before control strategy demonstration test to the adjustment of test objective operation of power networks state by grid disturbance is set, performs step 7 if not;
Step 7: by revising flexible AC transmitting system control strategy definite value, realize the front operation of power networks state of control strategy demonstration test to the adjustment of test objective operation of power networks state.
In described step 1, the operation of power networks initial condition on basis comprises that near region trend power, busbar voltage, reactive power compensation drop into state and flexible AC transmitting system state; Described flexible AC transmitting system control strategy definite value comprises control strategy action logic and operation condition.
Described step 2 specifically comprises the following steps:
Step 2-1: the disturbance that simulation calculation electrical network produces electrical network in the process of operation of power networks state before basic operation of power networks initial condition is adjusted to test, comprises that the busbar voltage that fixedly reactive compensation switching and the adjustment of flexible AC transmitting system state cause fluctuates;
Step 2-2 judges whether electrical network can bear the disturbance producing in the process of operation of power networks state before basic operation of power networks initial condition is adjusted to test, if being in course of adjustment, electrical network do not exceed operation limit value, can bear this disturbance, proceed to step 2-4, otherwise execution step 2-3;
Step 2-3: judge whether capable of regulating of operation of power networks initial condition, be included in debugging near region start-stop unit, adjust passage trend, draw and stop circuit to adjust flexible AC transmitting system operation voltage level; If electrical network remains with, adjust space, i.e. operation of power networks initial condition capable of regulating, adjusts operation of power networks initial condition, and proceeds to step 2-1; Otherwise return to step 1;
Step 2-4: determine final operation of power networks initial condition.
In described step 3, before the control strategy demonstration test on basis, operation of power networks state comprises that busbar voltage, reactive power compensation drop into state and flexible AC transmitting system state, test objective operation of power networks state is that the front state of control strategy demonstration test is after triggering control strategy, the electric network state of element after having moved in flexible AC transmitting system, comprises that busbar voltage, reactive power compensation drop into state and flexible AC transmitting system state.
Described step 4 comprises the following steps:
Step 4-1: simulation calculation triggers after control strategy, by operation of power networks state before basic control strategy demonstration test, to disturbance electrical network being produced in the process of test objective operation of power networks state, comprise the busbar voltage fluctuation that flexible AC transmitting system state variation causes;
Step 4-2: judge whether electrical network can bear by operation of power networks state before basic control strategy demonstration test to the disturbance producing in the process of test objective operation of power networks state, if electrical network is in course of adjustment, do not exceed operation limit value, can bear this disturbance and proceed to step 4-3; Otherwise return to step 3;
Step 4-3: determine the front operation of power networks state of final control strategy demonstration test and test objective operation of power networks state.
In described step 5, the grid disturbance of setting comprises adopting fixedly reactive compensation switching, the adjustment of flexible AC transmitting system state or drawing and stops circuit measure and cause that busbar voltage fluctuates; Trigger control strategy, flexible AC transmitting system, according to control strategy logic of propositions auto-action, completes by operation of power networks state before control strategy demonstration test to the adjustment of test objective operation of power networks state.
Described step 6 comprises the following steps:
Step 6-1: simulation calculation is determined before control strategy verification experimental verification under operation of power networks state, trigger the required electric grid operating of control strategy, comprise that fixedly position and capacity, the flexible AC transmitting system state of reactive compensation switching are adjusted position and capacity and need to draw the circuit stopping;
Step 6-2: judge whether electrical network possesses the condition that realizes required electric grid operating, comprise whether electrical network is possessed enough reactive power compensations and whether left enough capacity for adjusting and whether having suitable circuit to stop for drawing for switching, flexible AC transmitting system; If satisfy the requirements, proceed to step 6-3, otherwise proceed to step 6-4;
Step 6-3: judge whether electrical network can bear the disturbance that required electric grid operating produces; If electrical network is in course of adjustment, do not exceed operation limit value, can bear this disturbance, by grid disturbance is set, realize by operation of power networks state before control strategy demonstration test to the adjustment of test objective operation of power networks state; Otherwise proceed to step 7;
Described step 7 comprises the following steps:
Step 7-1: judge whether the front operation of power networks state of control strategy demonstration test and test objective operation of power networks state are the combinations of states that realizes the required disturbance minimum of test order; If proceed to step 7-2, otherwise proceed to step 1;
Step 7-2: revise flexible AC transmitting system control strategy definite value, make busbar voltage and the flexible AC transmitting system control strategy definite value of the front operation of power networks state of control strategy demonstration test inconsistent, trigger control strategy, realize the front operation of power networks state of control strategy test to the adjustment of test objective operation of power networks state.
Compared with prior art, beneficial effect of the present invention is:
1. having contained from initial mode to test method transition, having tested, the action of FACTS element triggers three aspects to grid disturbances and control strategy, coordinate to determine electrical network initial launch state, the front operation of power networks state of policy validation test, test objective operation of power networks state, control strategy definite value and grid disturbance operation, realize the Whole Process Control from electrical network initial launch state to test objective running status;
2. the present invention can apply to polymorphic type, large capacity FACTS system coordination control strategy on-site verification, and whether check element can be by control strategy logic of propositions and condition correct operation, for power system stability operation provides foundation.
Accompanying drawing explanation
Fig. 1 is large capacity flexible AC transmitting system control strategy on-site verification method flow diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The invention provides a kind of large capacity flexible AC transmitting system control strategy on-site verification method, said method comprising the steps of:
Step 1: determine basic operation of power networks initial condition and flexible AC transmitting system control strategy definite value;
In described step 1, the operation of power networks initial condition on basis is referred to as A, and overfill power 360MVar and the controlled high resistance of double-circuit line bus of busbar voltage 755kV, SVC is 100% grade; Described flexible AC transmitting system control strategy definite value is referred to as D, FACTS control strategy is that the out-of-limit rear SVC action of busbar voltage is to the power of overfilling, if the busbar voltage still controlled high resistance of out-of-limit single back line raises one grade automatically, if busbar voltage still out-of-limit another controlled high resistance in loop line road raises one grade automatically, target zone [770kV, 780kV].
Step 2: determine final operation of power networks initial condition;
Described step 2 specifically comprises the following steps:
Step 2-1: the disturbance that simulation calculation electrical network produces electrical network in the process of operation of power networks state before basic operation of power networks initial condition is adjusted to test, comprises that the busbar voltage that fixedly reactive compensation switching and the adjustment of flexible AC transmitting system state cause fluctuates; SVC exerts oneself and is down to 330MVar by 360Mvar, busbar voltage rising 5kV; The controlled high resistance of double loop circuit is by 100% grade of action to 70% grade, busbar voltage rising 20kV;
Step 2-2 calculates guide rule > > and the power system safety and stability computational rules > > of < < State Grid Corporation of China according to < < electric power system, < < power grid operation regulation > > judges whether electrical network can bear the disturbance producing in the process of operation of power networks state before basic operation of power networks initial condition is adjusted to test, current state busbar voltage 755kV, second step operation causes voltage rising 25kV, there is not voltage out-of-limit risk, can bear this disturbance, proceed to step 2-4, otherwise execution step 2-3,
Step 2-3: calculate guide rule > > and the power system safety and stability computational rules > > of < < State Grid Corporation of China according to < < electric power system, < < power grid operation regulation > > judges whether capable of regulating of operation of power networks initial condition, be included in debugging near region start-stop unit, adjust passage trend, draw and stop circuit to adjust flexible AC transmitting system operation voltage level, if electrical network remains with, adjust space, i.e. operation of power networks initial condition capable of regulating, adjusts operation of power networks initial condition, and proceeds to step 2-1, otherwise return to step 1,
Step 2-4: determine final operation of power networks initial condition.
Step 3: determine the front operation of power networks state of basic control strategy demonstration test and test objective operation of power networks state;
In described step 3, before the control strategy demonstration test on basis operation of power networks state referred to as B, busbar voltage 780kV, the SVC 330MVar that exerts oneself, the controlled high resistance of double-circuit line bus is 70% grade; Test objective operation of power networks state is referred to as C, busbar voltage 755kV, and the SVC power 360MVar that overfills, the controlled high resistance of double-circuit line bus is 100% grade.
Step 4: determine the front operation of power networks state of final control strategy demonstration test and test objective operation of power networks state;
Described step 4 comprises the following steps:
Step 4-1: simulation calculation triggers after control strategy, by operation of power networks state before basic control strategy demonstration test, to disturbance electrical network being produced in the process of test objective operation of power networks state, comprise the busbar voltage fluctuation that flexible AC transmitting system state variation causes;
Step 4-2: calculate guide rule > > and the power system safety and stability computational rules > > of < < State Grid Corporation of China according to < < electric power system, < < power grid operation regulation > > judges whether electrical network can bear by operation of power networks state before basic control strategy demonstration test to the disturbance producing in the process of test objective operation of power networks state, if being in course of adjustment, electrical network do not exceed operation limit value, can bear this disturbance and proceed to step 4-3, otherwise return to step 3,
Step 4-3: determine the front operation of power networks state of final control strategy demonstration test and test objective operation of power networks state.
In described step 5, the grid disturbance E of setting comprises adopting fixedly reactive compensation switching, the adjustment of flexible AC transmitting system state or drawing and stops circuit measure and cause that busbar voltage fluctuates; Trigger control strategy, SVC exerts oneself and rises to 360Mvar by 330MVar, busbar voltage decline 5kV; The controlled high resistance of double-circuit line is successively by 70% grade of action to 100% grade, busbar voltage decline 20kV; Flexible AC transmitting system, according to control strategy logic of propositions auto-action, completes by operation of power networks state before control strategy demonstration test to the adjustment of test objective operation of power networks state.
: FACTS control strategy is that the out-of-limit rear SVC action of busbar voltage is to the power of overfilling, if the busbar voltage still controlled high resistance of out-of-limit single back line raises one grade automatically, if busbar voltage still out-of-limit another controlled high resistance in loop line road raises one grade, target zone [770kV, 780kV] automatically.Therefore, after set disturbance action, busbar voltage should be not less than 795kV and retain certain nargin, can guarantee that busbar voltage is still out-of-limit after SVC action to the controlled high resistance of the power of overfilling and a loop line road raises one grade, needs the controlled high resistance in another loop line road to raise one grade.
Step 5: by grid disturbance is set, trigger control strategy;
Step 6: simulation calculation grid disturbance, and judge whether electrical network can bear grid disturbance, if realize by operation of power networks state before control strategy demonstration test to the adjustment of test objective operation of power networks state by grid disturbance is set, performs step 7 if not;
Described step 6 comprises the following steps:
Step 6-1: simulation calculation is determined before control strategy verification experimental verification under operation of power networks state, trigger the required electric grid operating of control strategy, comprise that fixedly position and capacity, the flexible AC transmitting system state of reactive compensation switching are adjusted position and capacity and need to draw the circuit stopping; For example, before testing operation of power networks state Down Highway voltage 765kV, control strategy to be tested is " busbar voltage is lower than 760kV; the one-sided controlled high resistance of single back line is lowered one grade automatically ", electric grid operating E is set anti-for dropping into 3 groups low, busbar voltage decline 9kV to 756kV, reaches control strategy trigger condition.
Step 6-2: judge whether electrical network possesses the condition that realizes required electric grid operating, comprise whether electrical network is possessed enough reactive power compensations and whether left enough capacity for adjusting and whether having suitable circuit to stop for drawing for switching, flexible AC transmitting system; If satisfy the requirements, proceed to step 6-3, otherwise proceed to step 6-4;
Step 6-3: judge according to < < electric power system calculating guide rule > > and the power system safety and stability computational rules > > of < < State Grid Corporation of China, < < power grid operation regulation > > whether electrical network can bear the disturbance that required electric grid operating produces; If electrical network is in course of adjustment, do not exceed operation limit value, can bear this disturbance, by grid disturbance is set, realize by operation of power networks state before control strategy demonstration test to the adjustment of test objective operation of power networks state; Otherwise proceed to step 7;
Step 7: by revising flexible AC transmitting system control strategy definite value, realize the front operation of power networks state of control strategy demonstration test to the adjustment of test objective operation of power networks state.
Described step 7 comprises the following steps:
Step 7-1: judge whether the front operation of power networks state of control strategy demonstration test and test objective operation of power networks state are the combinations of states that realizes the required disturbance minimum of test order; For example SVC maximum output is 360MVar, if will verify, whether it is moved to the power of overfilling by initial equilibrium state, and initial equilibrium state maximum output is that now required disturbance quantity is minimum for 330MVar().If operation of power networks state and test objective operation of power networks state have been to realize the required disturbance minimum state combination of test objective before test, proceed to step 7-2, otherwise proceed to step 1;
Step 7-2: revise flexible AC transmitting system control strategy definite value, the current busbar voltage 765kV of operation of power networks state before test for example, former control strategy to be tested is " busbar voltage is lower than 760kV; the one-sided controlled high resistance of single back line is lowered one grade automatically ", be revised as " busbar voltage is lower than 770kV; the one-sided controlled high resistance of single back line is lowered one grade automatically ", before test, under operation of power networks state, meet this strategy trigger condition.Make busbar voltage and the flexible AC transmitting system control strategy definite value of the front operation of power networks state of control strategy demonstration test inconsistent, trigger control strategy, realize the front operation of power networks state of control strategy test to the adjustment of test objective operation of power networks state; If policy control FACTS system continuous multi-stage to be verified action, needs in guarantee test process after the action of FACTS element one or many, system mode still meets strategy and triggers required condition.The former target voltage scope of coordinated control system [770kV, 780kV] for example, the out-of-limit rear SVC action of busbar voltage is to the power of overfilling, if busbar voltage still the one-sided controlled high resistance of out-of-limit single back line automatically raise one grade.Operation of power networks state busbar voltage 775kV before test, SVC the is idle 330MVar that exerts oneself, action to the power busbar voltage of the overfilling about 5kV that declines, the controlled high resistance initial condition of circuit is 70% grade, raises one grade to 100% grade, the busbar voltage about 10kV that declines.Change control policy goals voltage range is [755kV, 765kV], and before test, the current busbar voltage of operation of power networks state meets operation condition, and after SV C reaches the power of overfilling, voltage is about 770kV and still meets the controlled high resistance operation condition of circuit.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (8)
1. a large capacity flexible AC transmitting system control strategy on-site verification method, is characterized in that: said method comprising the steps of:
Step 1: determine basic operation of power networks initial condition and flexible AC transmitting system control strategy definite value;
Step 2: determine final operation of power networks initial condition;
Step 3: determine the front operation of power networks state of basic control strategy demonstration test and test objective operation of power networks state;
Step 4: determine the front operation of power networks state of final control strategy demonstration test and test objective operation of power networks state;
Step 5: by grid disturbance is set, trigger control strategy;
Step 6: simulation calculation grid disturbance, and judge whether electrical network can bear grid disturbance, if realize by operation of power networks state before control strategy demonstration test to the adjustment of test objective operation of power networks state by grid disturbance is set, performs step 7 if not;
Step 7: by revising flexible AC transmitting system control strategy definite value, realize the front operation of power networks state of control strategy demonstration test to the adjustment of test objective operation of power networks state.
2. large capacity flexible AC transmitting system control strategy on-site verification method according to claim 1, it is characterized in that: in described step 1, the operation of power networks initial condition on basis comprises that near region trend power, busbar voltage, reactive power compensation drop into state and flexible AC transmitting system state; Described flexible AC transmitting system control strategy definite value comprises control strategy action logic and operation condition.
3. large capacity flexible AC transmitting system control strategy on-site verification method according to claim 1, is characterized in that: described step 2 specifically comprises the following steps:
Step 2-1: the disturbance that simulation calculation electrical network produces electrical network in the process of operation of power networks state before basic operation of power networks initial condition is adjusted to test, comprises that the busbar voltage that fixedly reactive compensation switching and the adjustment of flexible AC transmitting system state cause fluctuates;
Step 2-2 judges whether electrical network can bear the disturbance producing in the process of operation of power networks state before basic operation of power networks initial condition is adjusted to test, if being in course of adjustment, electrical network do not exceed operation limit value, can bear this disturbance, proceed to step 2-4, otherwise execution step 2-3;
Step 2-3: judge whether capable of regulating of operation of power networks initial condition, be included in debugging near region start-stop unit, adjust passage trend, draw and stop circuit to adjust flexible AC transmitting system operation voltage level; If electrical network remains with, adjust space, i.e. operation of power networks initial condition capable of regulating, adjusts operation of power networks initial condition, and proceeds to step 2-1; Otherwise return to step 1;
Step 2-4: determine final operation of power networks initial condition.
4. large capacity flexible AC transmitting system control strategy on-site verification method according to claim 1, it is characterized in that: in described step 3, before the control strategy demonstration test on basis, operation of power networks state comprises that busbar voltage, reactive power compensation drop into state and flexible AC transmitting system state, test objective operation of power networks state is that the front state of control strategy demonstration test is after triggering control strategy, the electric network state of element after having moved in flexible AC transmitting system, comprises that busbar voltage, reactive power compensation drop into state and flexible AC transmitting system state.
5. large capacity flexible AC transmitting system control strategy on-site verification method according to claim 1, is characterized in that: described step 4 comprises the following steps:
Step 4-1: simulation calculation triggers after control strategy, by operation of power networks state before basic control strategy demonstration test, to disturbance electrical network being produced in the process of test objective operation of power networks state, comprise the busbar voltage fluctuation that flexible AC transmitting system state variation causes;
Step 4-2: judge whether electrical network can bear by operation of power networks state before basic control strategy demonstration test to the disturbance producing in the process of test objective operation of power networks state, if electrical network is in course of adjustment, do not exceed operation limit value, can bear this disturbance and proceed to step 4-3; Otherwise return to step 3;
Step 4-3: determine the front operation of power networks state of final control strategy demonstration test and test objective operation of power networks state.
6. large capacity flexible AC transmitting system control strategy on-site verification method according to claim 1, it is characterized in that: in described step 5, the grid disturbance of setting comprises adopting fixedly reactive compensation switching, the adjustment of flexible AC transmitting system state or drawing and stops circuit measure and cause that busbar voltage fluctuates; Trigger control strategy, flexible AC transmitting system, according to control strategy logic of propositions auto-action, completes by operation of power networks state before control strategy demonstration test to the adjustment of test objective operation of power networks state.
7. large capacity flexible AC transmitting system control strategy on-site verification method according to claim 1, is characterized in that: described step 6 comprises the following steps:
Step 6-1: simulation calculation is determined before control strategy verification experimental verification under operation of power networks state, trigger the required electric grid operating of control strategy, comprise that fixedly position and capacity, the flexible AC transmitting system state of reactive compensation switching are adjusted position and capacity and need to draw the circuit stopping;
Step 6-2: judge whether electrical network possesses the condition that realizes required electric grid operating, comprise whether electrical network is possessed enough reactive power compensations and whether left enough capacity for adjusting and whether having suitable circuit to stop for drawing for switching, flexible AC transmitting system; If satisfy the requirements, proceed to step 6-3, otherwise proceed to step 6-4;
Step 6-3: judge whether electrical network can bear the disturbance that required electric grid operating produces; If electrical network is in course of adjustment, do not exceed operation limit value, can bear this disturbance, by grid disturbance is set, realize by operation of power networks state before control strategy demonstration test to the adjustment of test objective operation of power networks state; Otherwise proceed to step 7.
8. large capacity flexible AC transmitting system control strategy on-site verification method according to claim 7, is characterized in that: described step 7 comprises the following steps:
Step 7-1: judge whether the front operation of power networks state of control strategy demonstration test and test objective operation of power networks state are the combinations of states that realizes the required disturbance minimum of test order; If proceed to step 7-2, otherwise proceed to step 1;
Step 7-2: revise flexible AC transmitting system control strategy definite value, make busbar voltage and the flexible AC transmitting system control strategy definite value of the front operation of power networks state of control strategy demonstration test inconsistent, trigger control strategy, realize the front operation of power networks state of control strategy test to the adjustment of test objective operation of power networks state.
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