CN103106299B - Based on DC transmission system phase conversion failure judgment and the analogy method of electromechanical transient - Google Patents
Based on DC transmission system phase conversion failure judgment and the analogy method of electromechanical transient Download PDFInfo
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Abstract
The present invention discloses a kind of DC transmission system phase conversion failure judgment based on electromechanical transient and analogy method, and phase conversion failure judgment method is: set up the AC and DC power system electromechanical transient simulation model containing direct current transportation; In calculating AC system a bit there is AC three-phase/single-phase earthing fault in certain; The situation of change of comparative analysis instant of failure high-voltage d. c inverse transform side change of current bus three-phase voltage effective value is to judge whether straight-flow system commutation failure occurs; Commutation judgement is carried out for each point in AC system, calculates and determine AC fault region.Analogy method is: according to direct-current commutation failure judged result, adopts artificial amendment DC power analog DC system commutation failure.Present invention employs the electromechanical transient simulation program that electric system accounts for leading application status, adaptability and practicality stronger, and it is simple and practical and too conservative, in computational analysis that alternating current-direct current is influenced each other, emulation mode of the present invention and result are effective and feasible, can effectively meet needed for engineer applied.
Description
Technical field
The invention belongs to electric system technical field of direct current power transmission, particularly a kind of DC transmission system phase conversion failure judgment based on electromechanical transient and analogy method.
Background technology
DC transmission system commutation failure take thyristor as the common phenomenon of the straight-flow system of commutation components.A characteristic of thyristor valve is that it turns in the process of shutoff by forward conduction, must be removed/compound at the free son of forward conduction stage internal reservoir before valve can set up forward voltage blocking ability.Therefore, the transverter of straight-flow system needs certain minimum reverse voltage---time zone, and namely thyristor valve continues for some time to realize sub-compound of dissociating/dissociate under reverse voltage effect.Analyze from energy conception, thyristor valve turns shutoff by forward conduction, goes this process free, be actually the process being provided energy change thyristor valve state by outside to free son.For a certain specific thyristor valve, go free required energy to be a definite value, this energy is the reverse voltage born with thyristor valve---go the area in free this region of duration to represent.When AC system generation three-phase or single-phase earthing fault, change of current busbar voltage can be caused to fall, and natural commutation point is constant, and the commutation energy (integral area of current versus time) that voltage drop causes is not enough, and then causes commutation failure.
At present, China has increasing DC transmission engineering and drops into operation of power networks, and the hybrid AC/DC power transmission systems that south electric network defines " eight friendships five are straight ", becomes many feed-ins Ac/dc Power Systems maximum in the world.In Ac/dc Power Systems, straight-flow system commutation failure is one of modal fault of straight-flow system.The safe and stable operation of continuous print commutation failure not only serious threat straight-flow system itself, and likely cause the incorrect operation of AC system relay protection, even cause the action of a series of control protective unit, cause serious consequence.Therefore, whether the three-phase shortcircuit that in effective judgement and simulating grid, different location occurs and single-phase grounding fault can cause direct current transportation inverter generation commutation failure, and direct current transportation power recovery characteristics has material impact to stability analysis result after fault clearance, especially to direct current many drop points electrical network, some fault may cause multiple direct current transportation inverter commutation failure to occur simultaneously, if can not correctly be judged and simulation commutation failure and failover characteristic by simulation calculation, then the possibility of result of alternating current-direct current cross-impact analysis and the performance of practical power systems have larger discrepancy.
Electromagnetical transient emulation method considers the nonlinear characteristic of straight-flow system and Control protection system electro-magnetic transient characteristic, Transmission Line Distributed Parameter characteristic and the frequency characteristic of parameter, the electromagnetic process of generator and series of elements, can comparatively straight-flow system commutation failure overall process after accurate simulation fault in ac transmission system.But due to the restriction by realistic model and algorithm, electromagnetic transient simulation solving speed slowly, large-scale scanning simulation calculation cannot be carried out, and the electric system scale that can describe is also relatively little, often need to carry out system equivalent, and then lost some inherent characteristics of AC system to a certain extent.Simultaneously, the operation of current power system, scheduling, planning department and even research, testing department extensively adopt electromechanical transient simulation program to carry out AC and DC power system emulation, and following long period of time still can in occupation of leading position in the analytical calculation of AC and DC power system.But along with the fast development of AC and DC power system, electromechanical transient program some shortcomings part in actual applications highlights gradually, comprising:
(1) in the DC Model of electromechanical transient simulation program, do not comprise analog DC system converter valve group and triggering system thereof, the voltage and current of converter valve cannot be simulated, cannot the commutation failure process of Detailed simulation inverter side, can only judge whether roughly commutation failure occurs according to the size of inverter extinguish angle.
(2) DC Model of electromechanical transient simulation program condition premised on change of current bus three-phase alternating voltage symmetry, when during AC system unbalanced fault, the voltage of current conversion station ac bus is no longer symmetrical, and quasi steady state model during this period simulation result is not strict accurate.
(3) DC Model of electromechanical transient simulation program only considers system first-harmonic characteristic, does not simulate the harmonic characteristic of straight-flow system, and also do not consider the various losses of current conversion station, idle calculated value may cause larger error.
Above-mentioned deficiency, cause electromechanical transient simulation partially optimistic to the simulation of straight-flow system commutation failure, during being mainly manifested in AC system generation three-phase (single-phase) short trouble, the DC power of electromechanical transient simulation result is bigger compared with actual motion value, and after short trouble disappears, also relatively actual motion value is fast for the DC power resume speed of electromechanical transient simulation result.Consider that whether power system computation analysis is stable and should adopt relatively conservative computing method, therefore need to study the DC transmission system phase conversion failure judgment can guarding analysis for electromechanical transient simulation and analogy method.
Summary of the invention
The object of the invention is, for overcoming electromechanical transient simulation to the partially optimistic deficiency of the emulation mode of straight-flow system commutation failure and shortcoming, to propose a kind of DC transmission system phase conversion failure judgment based on electromechanical transient and analogy method.This method considers DC transmission system commutation failure and DC power recovery characteristics, simple and practical and too conservative electromechanical transient simulation determination methods.
Object of the present invention is realized by following technical measures:
Based on a DC transmission system phase conversion failure judgment method for electromechanical transient simulation, comprise the following steps:
S1. set up the AC and DC power system electromechanical transient simulation model containing direct current transportation, comprise power flow algorithm and stability Calculation model;
S2. utilize the electromechanical transient simulation model that step S1 is formed, in calculating AC system a bit there is AC three-phase/single-phase earthing fault in certain, high-voltage d. c inverse transform side change of current bus three-phase voltage effective value U before acquisition fault
r0-with instant of failure high-voltage d. c inverse transform side change of current bus three-phase voltage effective value U
r0+;
S3. the electromechanical transient simulation result of step S2 is utilized, adopt practical operating experiences and electromagnetic transient simulation result as the basis judging commutation failure occurrence condition, judge whether straight-flow system commutation failure occurs by comparative analysis instant of failure high-voltage d. c inverse transform side change of current bus three-phase voltage effective value situation of change:
If S301. simulation calculation is AC three-phase short trouble, and instant of failure DC inversion side change of current bus three-phase voltage drops into less than 90%, i.e. U of magnitude of voltage before fault
r0+/ U
r0-<0.9, then judge that the three phase short circuit fault of this some generation AC system will cause corresponding direct current generation commutation failure;
If S302. simulation calculation is AC single phase short trouble, and instant of failure DC inversion side change of current bus three-phase voltage drops into less than 92%, i.e. U of magnitude of voltage before fault
r0+/ U
r0-<0.92, then judge that the single-phase earthing fault of this some generation AC system will cause corresponding direct current generation commutation failure;
If S303. simulation calculation is AC three-phase short trouble or single-phase earthing fault, and instant of failure DC inversion side change of current bus three-phase voltage drops into less than 70%, i.e. U of magnitude of voltage before fault
r0+/ U
r0-<0.7, then judge that the short trouble of this some generation AC system will cause corresponding direct current generation commutation failure, and DC power will be reduced to zero;
S4. for each point in AC system, repeat step S3, calculated by scanning and determine the AC fault region causing commutation failure of high voltage direct current system under given fault type.
Described step S1 specifically comprises the following steps:
S11. the power flow algorithm of the AC and DC power system containing direct current transportation is set up; Require that ac and dc systems model should comprise 110kV and above electrical network in electrical network, electric load hangs in 220kV and 110kV main transformer, low-pressure side, and reactive power compensator needs simulation separately, does not merge with load;
S12. the multilayer output feedback network model of the AC and DC power system containing direct current transportation is set up; Require that synchronous generator adopts Eq ", Ed " variation model, and consider automatic magnetic exciting control device, speed regulator and PSS effect; Straight-flow system optimum configurations needs to consider DC control system effect; Load model adopts by constant impedance, steady current, firm power take into account the integrated load model of the frequency characteristic factor.
Set up the AC and DC power system electromechanical transient simulation model containing direct current transportation, comprise the following steps:
1. set up the Load flow calculation network model of the AC and DC power system containing direct current transportation.Require that ac and dc systems network model should comprise 110kV and above electrical network in electrical network, electric load hangs in 220kV and 110kV main transformer, low-pressure side, and reactive power compensator needs simulation separately, does not merge with load.
2. set up the multilayer output feedback network network model of the AC and DC power system containing direct current transportation.Require that synchronous generator adopts Eq ", Ed " variation model, and consider automatic magnetic exciting control device, speed regulator and PSS effect.Straight-flow system optimum configurations needs to consider DC control system effect.Load model adopts by constant impedance, steady current, firm power take into account the integrated load model of the frequency characteristic factor.
The present invention also proposes a kind of in the DC transmission system commutation failure analogy method of electromechanical transient, comprises the following steps:
According to the DC transmission system phase conversion failure judgment result based on electromechanical transient simulation, if in AC system a bit there is straight-flow system commutation failure after AC three-phase/single-phase earthing fault in certain, in transient emulation calculate, then adopt artificial amendment DC power analog DC system commutation failure, comprise the following steps:
S31. the T when AC system three-phase/single-phase fault occurs
fault occursby DC power definite value people for being set to 0, continue 5 cycles;
S32. the T when three-phase/single-phase earthing fault disappears
failure vanishesstart to recover DC power, after 5 cycles, straight-flow system power definite value returns to rated power.
Tool of the present invention has the following advantages:
For existing main flow electromechanical transient simulation program, inaccurate problem is simulated to direct-current commutation failure, adopt practical operating experiences and electromagnetic transient simulation result as the basis judging commutation failure occurrence condition, if namely AC three-phase/single-phase earthing fault makes change of current bus three-phase/single-phase voltage drop into normal operating voltage value 92% (90%) and following, can there is commutation failure in DC transmission system mostly.Meanwhile, for electromechanical transient simulation program when fault in ac transmission system to DC system fault during the relative optimistic problem of simulation of recovery characteristics after dynamic perfromance and fault, intend adopting the method for amendment DC power definite value to improve simulation result.Direct-current commutation failure of the present invention judges and analogy method, have employed the electromechanical transient simulation program of electric system main flow, adaptability and practicality stronger, and it is simple and practical and too conservative, in computational analysis that alternating current-direct current is influenced each other, emulation mode of the present invention and result are effective and feasible, can effectively meet needed for engineer applied.
Accompanying drawing explanation
Fig. 1 is straight-flow system phase conversion failure judgment figure (AC system three phase short circuit fault figure).
Fig. 2 is the straight-flow system commutation failure analogy method schematic diagram that the present invention proposes.
Fig. 3 is DC transmission system phase conversion failure judgment based on electromechanical transient simulation and analogy method effect contrast figure.
Embodiment
Below in conjunction with accompanying drawing and computer sim-ulation example, the present invention is further described.
Fig. 1 is for after AC system three phase short circuit fault, judges straight-flow system whether phase conversion failure judgment schematic diagram according to current conversion station busbar voltage.The straight-flow system running status of three kinds of different inverter side change of current busbar voltage response curves and correspondence thereof is illustrated in this figure.The DC transmission system phase conversion failure judgment method based on electromechanical transient simulation that the present invention proposes, by comparing the instant of failure high-voltage d. c inverse transform side change of current bus three-phase voltage effective value of electromechanical transient simulation: (1) if simulation calculation be AC three-phase short trouble, and instant of failure DC inversion side change of current bus three-phase voltage drops into less than 90%, i.e. U of magnitude of voltage before fault
r0+/ U
r0-<0.9, then after judging the three phase short circuit fault of this some generation AC system can not there is commutation failure in direct current.Namely when AC system generation three-phase shortcircuit, current conversion station bus change as shown in curve in Fig. 11 between age at failure, then direct current can not commutation failure; (2) if simulation calculation be AC three-phase short trouble, and instant of failure DC inversion side change of current bus three-phase voltage drops into less than 90%, i.e. U of magnitude of voltage before fault
r0+/ U
r0-<0.9, then judge that the three phase short circuit fault of this some generation AC system will cause corresponding direct current generation commutation failure.Namely when AC system generation three-phase shortcircuit, current conversion station bus change as shown in curve in Fig. 12 between age at failure, then can there is commutation failure in direct current; (3) if simulation calculation be AC three-phase short trouble or single-phase earthing fault, and instant of failure DC inversion side change of current bus three-phase voltage drops into less than 70%, i.e. U of magnitude of voltage before fault
r0+/ U
r0-<0.7, then judge that the short trouble of this some generation AC system will cause corresponding direct current generation commutation failure, and DC power will be reduced to zero.Namely when AC system generation three-phase shortcircuit, current conversion station bus change as shown in curve in Fig. 13 between age at failure, then direct current generation commutation failure, and DC power will be reduced to zero.
Fig. 2 is straight-flow system commutation failure analogy method schematic diagram, and in figure, red line is the straight-flow system power definite value of the generation commutation failure arranged in simulation calculation.Namely in transient emulation calculates, adopt artificial amendment DC power analog DC system commutation failure, when AC system three-phase (single-phase) fault occurs, T (fault generation) is by DC power definite value people for being set to 0, continues 5 cycles (0.1 second); When three-phase (single-phase) short trouble disappears, T (failure vanishes) starts to recover DC power, 5 cycles (0.1 second) afterwards straight-flow system power definite value return to rated power.
Fig. 3 adopts Fig. 2 straight-flow system commutation failure analogy method to carry out the result emulated, the DC power response curve (curve 3) adopting EMTDC electromagnetic transient simulation (curve 1), BPA electromechanical transient simulation (curve 2) and adopt the BPA electromechanical transient simulation after method of the present invention is sets forth, wherein in figure.As we can see from the figure, adopt electromechanical transient simulation (curve 2), during AC system three phase short circuit fault, comparatively electromagnetic transient simulation result value is high for DC power value; And adopting straight-flow system commutation failure analogy method (curve 3), during AC system three phase short circuit fault, comparatively electromagnetic transient simulation result value (curve 1) is lower for DC power value, and after failure vanishes, DC power resume speed is slower.Under consideration electromagnetic transient simulation result (curve 1) more believable prerequisite, angle is affected from for system stability, adopt the result of calculation of emulation mode of the present invention comparatively actual motion value and electromagnetic transient simulation value more conservative, adopt the present invention to carry out power system safety and stability computational analysis, it is more rationally more conservative for particularly carrying out the influence each other result of calculation of computational analysis of alternating current-direct current.
Therefore, the direct-current commutation failure based on electromechanical transient simulation of the present invention judges and analogy method, and the electromechanical transient simulation program of electric system main flow can be adopted to carry out computational analysis, and adaptability and practicality are comparatively strong, and simple and practical and too conservative.In the computational analysis that influences each other to alternating current-direct current, emulation mode of the present invention is effective and feasible through engineering approaches computational analysis means.
Claims (2)
1., based on a DC transmission system phase conversion failure judgment method for electromechanical transient, it is characterized in that, comprise the following steps:
S1. set up the AC and DC power system electromechanical transient simulation model containing direct current transportation, comprise power flow algorithm and stability Calculation model;
S2. utilize the electromechanical transient simulation model that step S1 is formed, in calculating AC system a bit there is AC three-phase/single-phase earthing fault in certain, high-voltage d. c inverse transform side change of current bus three-phase voltage effective value U before acquisition fault
r0-with instant of failure high-voltage d. c inverse transform side change of current bus three-phase voltage effective value U
r0+;
S3. the electromechanical transient simulation result of step S2 is utilized, adopt practical operating experiences and electromagnetic transient simulation result as the basis judging commutation failure occurrence condition, judge whether straight-flow system commutation failure occurs by comparative analysis instant of failure high-voltage d. c inverse transform side change of current bus three-phase voltage effective value situation of change:
If S301. simulation calculation is AC three-phase short trouble, and instant of failure DC inversion side change of current bus three-phase voltage drops into less than 90%, i.e. U of magnitude of voltage before fault
r0+/ U
r0-<0.9, then judge that the three phase short circuit fault of this some generation AC system will cause corresponding direct current generation commutation failure;
If S302. simulation calculation is AC single phase short trouble, and instant of failure DC inversion side change of current bus three-phase voltage drops into less than 92%, i.e. U of magnitude of voltage before fault
r0+/ U
r0-<0.92, then judge that the single-phase earthing fault of this some generation AC system will cause corresponding direct current generation commutation failure;
If S303. simulation calculation is AC three-phase short trouble or single-phase earthing fault, and instant of failure DC inversion side change of current bus three-phase voltage drops into less than 70%, i.e. U of magnitude of voltage before fault
r0+/ U
r0-<0.7, then judge that the short trouble of this some generation AC system will cause corresponding direct current generation commutation failure, and DC power will be reduced to zero;
S4. for each point in AC system, repeat step S3, calculated by scanning and determine the AC fault region causing commutation failure of high voltage direct current system under given fault type.
2. the DC transmission system phase conversion failure judgment method based on electromechanical transient according to claim 1, it is characterized in that, described step S1 specifically comprises the following steps:
S11. the power flow algorithm of the AC and DC power system containing direct current transportation is set up; Require that ac and dc systems model should comprise 110kV and above electrical network in electrical network, electric load hangs in 220kV and 110kV main transformer, low-pressure side, and reactive power compensator needs simulation separately, does not merge with load;
S12. the multilayer output feedback network model of the AC and DC power system containing direct current transportation is set up; Require that synchronous generator adopts Eq ", Ed " variation model, and consider automatic magnetic exciting control device, speed regulator and PSS effect; Straight-flow system optimum configurations needs to consider DC control system effect; Load model adopts by constant impedance, steady current, firm power take into account the integrated load model of the frequency characteristic factor.
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| CN110266032B (en) * | 2019-05-14 | 2023-01-03 | 天津大学 | Feasible domain description method for HVDC system commutation process |
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| CN111416375B (en) * | 2020-03-06 | 2023-06-23 | 天津大学 | Commutation failure prediction method considering transient direct current change process |
| CN111864738B (en) * | 2020-07-23 | 2021-11-02 | 华中科技大学 | Continuous commutation failure suppression method and device based on adaptive trigger angle compensation |
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| CN112255485A (en) * | 2020-10-20 | 2021-01-22 | 云南电网有限责任公司电力科学研究院 | Low-voltage fault detection device for power module of frequency modulation test platform of new energy unit |
| CN112994072B (en) * | 2021-04-27 | 2022-08-19 | 华北电力大学 | Two-port equivalent modeling method suitable for back-to-back VSC fault transient calculation |
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