CN107026483B - A kind of compound phase shifting control strategy under the DC transmission system inverter side AC fault suitable for LCC - Google Patents
A kind of compound phase shifting control strategy under the DC transmission system inverter side AC fault suitable for LCC Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses the compound phase shifting control strategies under a kind of DC transmission system inverter side AC fault suitable for LCC, including the phase shifting control based on DC current climbing and instantaneous value and the phase shifting control based on alternating voltage root mean square and degree of asymmetry；The former be used for inverter side AC fault initial stage act, with evade commutation failure or commutation failure occur in the case where shorten commutation failure duration；The latter is for the system convalescence movement after the middle and later periods of inverter side AC fault and fault clearance, with optimization system recovery characteristics, so as to effectively solve the problems, such as commutation failure caused under system inverter side AC fault.
Description
Technical field
The invention belongs to technical field of electric power system control, and in particular to one kind is suitable for LCC (Line Commuted
Convertor) the compound phase shifting control strategy under DC transmission system inverter side AC fault.
Background technique
D.C. high voltage transmission has important application in terms of China's transferring electricity from the west to the east and Asynchronous Interconnection.However, high-voltage dc transmission
Electric system is easy to happen commutation failure under inverter side AC fault, and so as to cause DC voltage reduction, DC current is increased, defeated
Power fall down is sent, and is had an adverse effect to the service life of converter valve；If it is improper to control in recovery process, continuous commutation occurs
Failure, then can be further exacerbated by the impact to receiving end AC network.In recent years, as China creates high voltage direct current transmission project electricity
The continuous improvement of grade and transmission power is pressed, commutation failure is increasingly significant to the adverse effect of AC system.
Inverter side control strategy is resisted the recovery capability after commutation failure and commutation failure to direct current transportation and is had a major impact.
Currently, the DC engineerings such as day that China has put into operation is wide, expensive wide, Yun Guang, small stream Luo Du and waxy common wheat use and are based on SIEMENS technology road
The control strategy of line；The control strategy inverter side include three kinds of control modes, i.e., constant DC voltage control mode, turn off angle surely
Control mode and standby constant current control mode；In actual motion, three kinds of control modes share a proportional and integral controller, and
Input of the greater in DC voltage deviation, shutdown angular displacement and DC current deviation as proportional and integral controller is selected,
Inverter side operates in constant DC voltage control mode under normal circumstances.
After short trouble occurs for inverter side AC system, the shutdown angle of Inverter Station thyristor is reduced rapidly, and turns off angular displacement
It is selected to the input of proportional and integral controller as the greater in three kinds of deviations, to make the control of inverter during failure
Mode processed, which is switched to, determines hold-off angle control.Determine the ratio that the speed that hold-off angle control mode acts depends in proportional and integral controller
Example coefficient and integration time constant；Under the Parameter Conditions that current high voltage direct current transmission project generallys use, inverter side Trigger Angle
It is reduced to Minimum Acceptable Value to usually require several ms from normal value, when having substantially exceeded needed for usual commutation failure generation
Between, cause commutation failure to be difficult to avoid that.
Summary of the invention
In view of above-mentioned, the invention proposes compound under a kind of DC transmission system inverter side AC fault suitable for LCC
Phase shifting control strategy can effectively solve the problem that commutation failure problem caused under system inverter side AC fault.
A kind of compound phase shifting control strategy under the DC transmission system inverter side AC fault suitable for LCC, comprising:
(1) phase shifting control based on DC current climbing and instantaneous value:
The DC current I of 1.1 acquisition systemsd, make its output result I after first order inertial loopdFAs the phase shift
The input of control；
1.2 couples of IdFClimbing dIdF/ dt is measured in real time, if dIdF/ dt is greater than threshold value C1And | IdF| it is greater than threshold value
C2, thening follow the steps 1.3, t indicates the time；
The triggering angle of advance β of 1.3 pairs of system inverters carries out pressure phase shift, i.e., forces triggering angle of advance β to increase Δ β1,
Δβ1For the phase shifting angle of setting；
(2) phase shifting control based on alternating voltage root mean square and degree of asymmetry:
The three-phase alternating voltage u of 2.1 acquisition system inverter sidesabc, make its input as the phase shifting control；
If 2.2 uabcDegree of asymmetry be greater than threshold value C3Or uabcThe root-mean-square value of corresponding line voltage is greater than threshold value C4, then execute
Step 2.3；
The triggering angle of advance β of 2.3 pairs of system inverters carries out pressure phase shift, i.e., forces triggering angle of advance β to increase Δ β2,
Δβ2For the phase shifting angle being calculated according to the degree of asymmetry and root-mean-square value.
Preferably, the phase shifting angle Δ β1Instruction value be set as 30 °.
Preferably, start-up study T is arranged based on the phase shifting control of DC current climbing and instantaneous value to described1With exit
Be delayed T2, and the phase shift result setting climbing exported to it limits R1R is limited with rate of descent2；To described equal based on alternating voltage
Start-up study T is arranged in the phase shifting control of root and degree of asymmetry3With exit delay T4, to improve phase shifting control starting and exit
Flexibility.
Further, the phase shifting angle Δ β2Calculating determination process are as follows: calculate intermediate change according to the following formula first
Measure uI, then make intermediate variable uIPhase shifting angle Δ β is obtained by first order inertial loop or ratio enlargement link2；
uI=max { K1|U-/+-C3|,K2|URMS-C4|}
Wherein: K1And K2It is the proportionality coefficient of setting, URMSFor uabcThe root-mean-square value of corresponding line voltage, U-/+For uabc's
Degree of asymmetry, that is, uabcNegative sequence component amplitude and the ratio between positive-sequence component amplitude.
Further, transmission function L (s) expression formula of the first order inertial loop is as follows:
Wherein: G0For the proportionality coefficient for marking, T0For inertia time constant, s is Laplace operator.
Further, the root-mean-square value URMSCalculation expression it is as follows:
Wherein: ua、ubAnd ucRespectively three-phase alternating voltage uabcThe voltage value of middle corresponding abc three-phase.
The compound phase shifting control strategy of the present invention includes phase shifting control based on DC current climbing and instantaneous value and is based on
The phase shifting control of alternating voltage root mean square and degree of asymmetry, the former is used to act at the initial stage of inverter side AC fault, to evade
Commutation failure or the duration for shortening commutation failure in the case where commutation failure occurs；The latter is used in inverter side AC fault
System convalescence movement after middle and later periods and fault clearance, it is inverse so as to effectively solve system with optimization system recovery characteristics
Commutation failure problem caused by becoming under the AC fault of side.
Detailed description of the invention
Fig. 1 is that the present invention is based on the phase shifting control flow diagrams of DC current climbing and instantaneous value.
Fig. 2 is that the present invention is based on the phase shifting control flow diagrams of alternating voltage root mean square and degree of asymmetry.
Fig. 3 is the structural schematic diagram that the compound phase shifting control of the present invention accesses raw DC transmission controller.
Fig. 4 (a) is simulation comparison schematic diagram of the A phase short trouble system in far field about alternating voltage.
Fig. 4 (b) is simulation comparison schematic diagram of the A phase short trouble system in far field about DC voltage.
Fig. 4 (c) is simulation comparison schematic diagram of the A phase short trouble system in far field about DC current.
Fig. 4 (d) is simulation comparison schematic diagram of the A phase short trouble system in far field about dc power.
Fig. 4 (e) is simulation comparison schematic diagram of the A phase short trouble system in far field about Trigger Angle.
Fig. 4 (f) is simulation comparison schematic diagram of the A phase short trouble system in far field about shutdown angle.
Fig. 4 (g) is simulation comparison schematic diagram of the A phase short trouble system in far field about phase shifting angle.
Fig. 5 (a) is simulation comparison schematic diagram of the three phase short circuit fault system near region about alternating voltage.
Fig. 5 (b) is simulation comparison schematic diagram of the three phase short circuit fault system near region about DC voltage.
Fig. 5 (c) is simulation comparison schematic diagram of the three phase short circuit fault system near region about DC current.
Fig. 5 (d) is simulation comparison schematic diagram of the three phase short circuit fault system near region about dc power.
Fig. 5 (e) is simulation comparison schematic diagram of the three phase short circuit fault system near region about Trigger Angle.
Fig. 5 (f) is simulation comparison schematic diagram of the three phase short circuit fault system near region about shutdown angle.
Fig. 5 (g) is simulation comparison schematic diagram of the three phase short circuit fault system near region about phase shifting angle.
Specific embodiment
In order to more specifically describe the present invention, with reference to the accompanying drawing and specific embodiment is to technical solution of the present invention
It is described in detail.
As shown in figure 3, the compound phase shifting control strategy of the present invention includes the phase shift based on DC current climbing and instantaneous value
Control and phase shifting control two parts based on alternating voltage root mean square and degree of asymmetry.
Fig. 1 is the phase shifting control process based on DC current climbing and instantaneous value, associated control parameters such as table 1 in Fig. 1
Shown in left column.In the controller, direct current is failed to be sold at auction rear and is inputted after inertial element as controller, and simultaneously to straight
The climbing speed and instantaneous value of galvanic electricity stream are judged.Climbing threshold value is set as 20pu/s, to avoid DC current under stable state
Normal fluctuation；Instantaneous value threshold value is set as 1.1 times, and controller misses during to instantaneous value judging that fault recovery can be evaded
Movement.Pressure phase shifting angle instruction value after the controller is enabled is set as 30 ° of (Δ β1), i.e. K=0.524.The phase shifting control
Start-up study is set as 0ms (starting immediately), climbing R1It does not limit, to improve controller response speed；Exit delay setting
For 20ms (one cycle of power frequency), rate of descent R2It is set as 3 °/ms, to improve the stationarity that the phase shifting control exits.
Table 1
Fig. 2 is the phase shifting control process based on alternating voltage degree of asymmetry and root-mean-square value, and associated control parameters are such as in Fig. 2
Shown in the right column of table 1.Phase shifting control based on alternating voltage includes the calculating link of enabled link and phase shift angle, and core exists
It is calculated in alternating voltage degree of asymmetry and root-mean-square value.
In present embodiment, the principle that root-mean-square value calculates is as follows:
Present embodiment actual use rms voltage on the basis of above formula further progress time constant be
The low-pass filtering of 20ms.
In present embodiment, degree of unbalancedness is calculated is decomposed based on positive-negative sequence, there is preferable spirit under all kinds of AC faults
Sensitivity.Ignore higher hamonic wave, converter station ac bus voltage may be expressed as:
In formula:WithRespectively positive sequence, negative phase-sequence and residual voltage t moment
In the phase of a phase,WithFor corresponding initial phase.
Abc- α β coordinate transform is carried out to above formula, as a result as follows:
1/4 cycle is postponed to above formula, i.e., replaces A and B with A- pi/2 and B- pi/2 respectively, obtains:
Using above two formula, positive and negative sequence voltage amplitude can be obtained are as follows:
In view of providing that negative sequence voltage degree of asymmetry is no more than 2% in national standard, it is no more than 4%, therefore this reality in short-term
Applying and enabling the condition one of link in mode is that negative sequence voltage degree of asymmetry is greater than 5%, to escape negative sequence voltage under normal circumstances
It changes；Simultaneously in view of the critical alternating voltage of commutation failure being calculated according to direct current transportation quasi steady state model is usually
0.9pu, therefore the condition two that link is enabled in present embodiment is that alternating voltage root-mean-square value is less than 0.9pu.Enabled condition is full
Start-up study T after foot3It is set as 0ms (starting immediately), exits delay T4It is set as 40ms.
The input u of phase shift angle calculating linkIIt is calculated as the following formula, it is contemplated that alternating voltage is not right under extreme case
Title degree was usually no more than for 50% (corresponding to two alternate metallic short circuits), therefore gave the difference of alternating voltage root-mean-square value and threshold value
Considered with halving, so that alternating voltage degree of asymmetry is consistent with the relative weighting of width root-mean-square value, i.e. K1=1.0 and K2=0.5.
uIPhase shift angle enabled and that controller is formed after inertial element, wherein gain G takes 2.5, i.e., controller is extremely
Force 64 ° of phase shift (0.45 × 2.5=1.125rad), inertia time constant T to take 10ms more.
Further to embody optimization of the compound phase shifting control for DC transmission system inverter side AC fault response condition
Effect is answered respectively under the conditions of far field A phase short trouble and near region three phase short circuit fault what is designed according to above embodiment
The response condition of system essential electrical amount carries out simulation comparison whether closing phase shifting control investment, as a result respectively such as Fig. 4 and Fig. 5 institute
Show.
After inverter side far field A phase AC fault occurs, the response condition comparison of system essential electrical amount is as shown in figure 4, knot
After fruit display puts into compound phase shifting control, the sound when failure response of direct current system is significantly better than only with original control strategy
It answers.Specifically, the short time interior phase shifting control based on DC current preferentially acts after failure occurs, make Trigger Angle when extremely short
It is interior to reach clipping low value, avoid commutation failure；After phase shifting control based on DC current exits, it is based on alternating voltage
Phase shifting control continue to carry out appropriate phase shift to Trigger Angle, it is straight after the maintenance and fault clearance of dc power during being conducive to failure
The fast quick-recovery of streaming system.
After inverter side near region three-phase alternating current failure occurs, the response condition comparison of system essential electrical amount is as shown in figure 5, knot
After fruit display puts into compound phase shifting control, the failure response of direct current system is better than the response only with original control strategy.Specifically
For, since three-phase fault is more serious, even if the fast quick-action of phase shifting control based on DC current in the short time after failure generation
Also commutation failure is not can avoid；After commutation failure nature, relative to only with original control strategy, it is based on exchange
The phase shifting control of voltage can make direct current system obtain bigger shutdown angle nargin, and steadily exiting with phase shifting control immediately,
The shutdown angle of system can be more quickly restored to steady-state value, shown as dc power and restored more rapid.
The above-mentioned description to embodiment is for that can understand and apply the invention convenient for those skilled in the art.
Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.
Claims (6)
1. the compound phase shifting control strategy under a kind of DC transmission system inverter side AC fault suitable for LCC, comprising:
(1) phase shifting control based on DC current climbing and instantaneous value:
The DC current I of 1.1 acquisition systemsd, make its output result I after first order inertial loopdFAs the phase shifting control
Input；
1.2 couples of IdFClimbing dIdF/ dt is measured in real time, if dIdF/ dt is greater than threshold value C1And | IdF| it is greater than threshold value C2, then hold
Row step 1.3, t indicate the time；
The triggering angle of advance β of 1.3 pairs of system inverters carries out pressure phase shift, i.e., forces triggering angle of advance β to increase Δ β1, Δ β1
For the phase shifting angle of setting；
(2) phase shifting control based on alternating voltage root mean square and degree of asymmetry:
The three-phase alternating voltage u of 2.1 acquisition system inverter sidesabc, make its input as the phase shifting control；
If 2.2 uabcDegree of asymmetry be greater than threshold value C3Or uabcThe root-mean-square value of corresponding line voltage is greater than threshold value C4, then follow the steps
2.3；
The triggering angle of advance β of 2.3 pairs of system inverters carries out pressure phase shift, i.e., forces triggering angle of advance β to increase Δ β2, Δ β2
For the phase shifting angle being calculated according to the degree of asymmetry and root-mean-square value.
2. compound phase shifting control strategy according to claim 1, it is characterised in that: the phase shifting angle Δ β1Instruction value set
It is set to 30 °.
3. compound phase shifting control strategy according to claim 1, it is characterised in that: be based on DC current climbing to described
Start-up study T is set with the phase shifting control of instantaneous value1With exit delay T2, and the phase shift result setting climbing exported to it limits
R processed1R is limited with rate of descent2。
4. compound phase shifting control strategy according to claim 1, it is characterised in that: be based on alternating voltage root mean square to described
Start-up study T is set with the phase shifting control of degree of asymmetry3With exit delay T4。
5. compound phase shifting control strategy according to claim 1, it is characterised in that: the phase shifting angle Δ β2Calculating determine
Process are as follows: calculate intermediate variable u according to the following formula firstI, then make intermediate variable uIBy first order inertial loop or ratio
Amplifying element obtains phase shifting angle Δ β2；
uI=max { K1|U-/+-C3|,K2|URMS-C4|}
Wherein: K1And K2It is the proportionality coefficient of setting, URMSFor uabcThe root-mean-square value of corresponding line voltage, U-/+For uabcIt is not right
Title degree, that is, uabcNegative sequence component amplitude and the ratio between positive-sequence component amplitude.
6. compound phase shifting control strategy according to claim 5, it is characterised in that: the root-mean-square value URMSComputational chart
It is as follows up to formula:
Wherein: ua、ubAnd ucRespectively three-phase alternating voltage uabcThe voltage value of middle corresponding abc three-phase.
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