CN109149595B - Phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method and system - Google Patents

Phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method and system Download PDF

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CN109149595B
CN109149595B CN201811080243.5A CN201811080243A CN109149595B CN 109149595 B CN109149595 B CN 109149595B CN 201811080243 A CN201811080243 A CN 201811080243A CN 109149595 B CN109149595 B CN 109149595B
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reactive power
voltage
target
control
reactive
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CN109149595A (en
Inventor
洪权
宋军英
吴晋波
郭思源
朱维钧
刘海峰
李辉
李理
徐浩
敖非
梁文武
李刚
臧欣
余斌
刘宇
潘伟
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The invention discloses a phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method and system, which keep the switching strategy of an alternating current filter bank of a direct current control protection system unchanged, obtain the switching instructions and the operation modes of a filter, a reactor bank and related control parameters of direct current control protection and the operation state of a phase modulator, adjust the control target of the phase modulator according to the switching instructions of the direct current control protection, and intervene in the switching instructions of an alternating current capacitor and a reactor which are output by the direct current control protection. Based on the existing control mode of the ultra-high voltage direct current transmission reactive power control and phase modulator, the invention can reduce the bus voltage fluctuation caused by the switching of the alternating current filter bank, can reduce the switching times of the capacitor and the reactor bank under a certain working condition, prolongs the service life of the alternating current capacitor and the reactor, does not need to change the internal control logic of the direct current protection and phase modulator, and is convenient to implement.

Description

Phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method and system
Technical Field
The invention relates to the operation and control technology of an electric power system, in particular to a method and a system for coordinated control of voltage and reactive power of a phase modulator and an extra-high voltage direct current converter station, which are used for realizing coordinated control of voltage and reactive power between the phase modulator in the extra-high voltage converter station and an alternating current filter bank controlled by a direct current control protection system in consideration of the current control situation.
Background
High-voltage direct-current transmission is used as a long-distance large-capacity transmission mode, has great advantages in construction economy and operation loss compared with traditional alternating-current transmission, but needs to consume a large amount of reactive power and generate a large amount of harmonic waves during operation, so that a large amount of reactive power equipment needs to be configured in an extra-high voltage converter station, and reactive power requirements of a direct-current system under different operation modes are met by generally configuring an alternating-current filter, a capacitor and a reactor group and realizing the switching of reactive power compensation equipment through direct-current control protection. Meanwhile, dynamic reactive equipment such as STATCOM and phase modulators can be configured in part of the converter stations to meet the requirements for dynamic control of the alternating-current bus voltage. At present, an extra-high voltage converter station is provided with a large-capacity phase modulator as a dynamic reactive support source for direct current transmission, which becomes the trend of direct current transmission construction in China, the thrown zhangqing and qishao direct current converter stations are provided with the large-capacity phase modulator, but no interaction exists between the control of the phase modulator and the reactive control of the direct current transmission, the coordination is lacked, the phase modulator is switched to zero with the reactive power of an alternating current system after being hung on a network, the dynamic reactive support is provided only when the bus voltage has larger deviation due to system faults, the reactive support capability of the large-capacity phase modulator in a steady state cannot be fully exerted, and the running economy is not high.
Therefore, a phase modulator and extra-high voltage direct current reactive power coordination control method comprehensively considering the actual capacity of the large-capacity phase modulator is needed to improve the operating economy of the phase modulator. For example, chinese patent application No. 201710307415.7 discloses a reactive power coordination control method for an ac filter and a phase modulator of a dc converter station, and reduces voltage impact when the filter is switched by adjusting reactive power in a direction opposite to the filter action direction in advance of the phase modulator when the ac filter is switched, and only considers the dynamic voltage stabilizing capability of the phase modulator, but does not consider the steady-state reactive power supporting capability of a large-capacity phase modulator.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention provides a phase modulator and voltage reactive power coordination control method and system for an extra-high voltage direct current converter station, aiming at the problems in the prior art, and based on the current situation that no control information interaction exists between the phase modulator of the extra-high voltage converter station and a direct current control protection system, the invention can simply and effectively coordinate and control the phase modulator and an alternating current filter bank, a capacitor and a reactor controlled by the direct current control protection system by constructing a coordination control mode without changing respective internal control logics of the direct current control protection and the phase modulator.
In order to solve the technical problems, the invention adopts the technical scheme that:
a phase modulator and voltage reactive power coordination control method for an extra-high voltage direct current converter station comprises the following implementation steps:
1) when the direct-current power transmission starting operation and the phase modulator are stable in operation, skipping to execute the step 2);
2) judging whether the direct-current power transmission control has a switching filter instruction, and if the direct-current power transmission control has the switching filter instruction, skipping to execute the step 3);
3) judging whether the switching filter instruction is a filter switching instruction, and if so, skipping to execute the step 4); if the instruction is a cut filter instruction, skipping to execute the step 5);
4) calculating a first deviation delta Uc between the estimated target voltage and the initial voltage target after one group of filters is put into and corresponding reactors are switched1Obtaining a first deviation delta Uc between the estimated target voltage and the initial voltage target1Corresponding reactive power Qc1As a reactive control target correction of the phase modifier, correcting the reactive control target of the phase modifier according to the reactive control target correction of the phase modifier, and carrying out amplitude limiting processing on the corrected reactive control target of the phase modifier; skipping and executing step 6);
5) calculating a second deviation delta Uc between the estimated target voltage and the initial voltage target after one group of filters are cut off and the corresponding reactors are switched2Obtaining a second deviation delta Uc between the estimated target voltage and the initial voltage target2Corresponding reactive power Qc2As a reactive control target correction of the phase modifier, correcting the reactive control target of the phase modifier according to the reactive control target correction of the phase modifier, and carrying out amplitude limiting processing on the corrected reactive control target of the phase modifier;
6) and updating the reactive control target of the phase modulator, ending the control period, and exiting to enter the next period.
Preferably, a first deviation Δ Uc between the target voltage and the initial voltage target is estimated in step 4)1The functional expression of (a) is represented by the formula (1); estimating a second deviation delta Uc between the target voltage and the initial voltage target in the step 5)2The functional expression of (a) is represented by the formula (2);
ΔUc1=Ug+ΔU-U0 （1）
in the formula (1), Ug is the actual value of the current bus voltage, Δ U is the voltage deviation converted to the ac bus according to the total reactive variable Δ Q corresponding to the filter input and the reactor input, and U0 is the target value of the initial bus voltage; the function expression of the voltage deviation delta U of the alternating current bus is shown as a formula (3);
ΔUc2= U0-(Ug-ΔU) （2）
in the formula (2), U0 is an initial bus voltage target value, Ug is a current bus voltage actual value, Delta U is a voltage deviation converted to an alternating current bus according to total reactive power variation Delta Q corresponding to filter input and reactor switching, and a functional expression of the voltage deviation Delta U of the alternating current bus is shown in a formula (3);
ΔU=ΔQ/(Sd-∑Q) （3）
in the formula (3), Δ Q is a total reactive power variation caused by switching of the current filter and switching of the corresponding reactor, Sd is a short-circuit capacity of an alternating-current bus of the converter station, and Σ Q is a total reactive power provided by the current filter bank including the reactor.
Preferably, the first deviation Δ Uc between the estimated target voltage and the initial voltage target is obtained in step 4)1Corresponding reactive power Qc1The function expression of (2) is shown as the formula (4), and the second deviation delta Uc of the estimated target voltage and the initial voltage target is obtained in the step 5)2Corresponding reactive power Qc2The functional expression of (a) is represented by the formula (5);
Qc1=ΔUc1/(Sd-∑Q) （4）
Qc2=ΔUc2/(Sd-∑Q) （5）
in the formulae (4) and (5), Δ Uc1To estimate a first deviation, Δ Uc, of the target voltage from the initial voltage target2In order to estimate a second deviation between the target voltage and the initial voltage target, Sd is the short-circuit capacity of the alternating-current bus of the converter station, and Sigma Q is the total reactive power provided by the current filter bank containing the reactor.
Preferably, the functional expression of the reactive control target of the phase modifier corrected according to the reactive control target correction quantity of the phase modifier in the step 4) and the step 5) is shown as the formula (6);
Qref(i+1)=Qref(i)+ΔQ1（6）
in the equation (6), Qref (i +1) is a reactive power control target of the phase modulation machine after the correction, Qref (i) is a reactive power control target of the phase modulation machine before the correction, and Δ Q1To the correction amount, and the correction amount DeltaQ used when correcting the reactive control target of the phase modifier based on the reactive control target correction amount of the phase modifier in step 4)1Satisfies Δ Q1=-Qc1Step 5), correcting quantity delta Q used when correcting the reactive power control target of the phase modifier according to the reactive power control target correcting quantity of the phase modifier1Satisfies Δ Q1=Qc2/2 wherein Qc1To estimate a first deviation Δ Uc between a target voltage and an initial voltage target1Corresponding amount of reactive power, Qc2To estimate a second deviation Δ Uc of the target voltage from the initial voltage target2Corresponding amount of reactive power.
Preferably, the limiting processing on the reactive control target of the phase modulator after the modification in the step 4) and the step 5) specifically includes: firstly, judging whether a reactive power control target Qref (i +1) of the phase modifier after being corrected is greater than a preset reactive power control target upper limit value Qmax, if so, assigning the reactive power control target Qref (i +1) of the phase modifier after being corrected to the preset reactive power control target upper limit value Qmax, otherwise, keeping the reactive power control target Qref (i +1) of the phase modifier after being corrected unchanged; and then judging whether the reactive power control target Qref (i +1) of the phase modifier after being corrected is smaller than a preset reactive power control target lower limit value Qmin or not, if so, assigning the reactive power control target Qref (i +1) of the phase modifier after being corrected to the preset reactive power control target lower limit value Qmin, otherwise, keeping the reactive power control target Qref (i +1) of the phase modifier after being corrected unchanged.
Preferably, the preset reactive power control target upper limit value Qmax is a difference value between the capacity of a group of filters and the capacity of a group of reactors; the preset reactive power control target lower limit value Qmin is an allowable phase advance value of the phase modifier at the current active operating point determined according to a phase advance test.
Preferably, the switching strategy of the extra-high voltage direct current control protection alternating current filter is kept unchanged in the step 1), and the phase modulator works in a reactive closed loop mode.
Preferably, the step 2) further includes judging whether a switching capacitor instruction exists in the direct-current power transmission control, and if the switching capacitor instruction exists, skipping to execute the step 7):
7) judging whether the switched capacitor instruction is a capacitor throwing instruction, and if the switched capacitor instruction is the capacitor throwing instruction, skipping to execute the step 8); if the instruction is a capacitor cutting instruction, skipping to execute the step 9);
8) calculating the actual first control voltage deviation at present as Δ Uc3The first control voltage deviation is set to Δ Uc3Corresponding reactive power control value Qc3As a correction value of the reactive control instruction of the phase modulator, correcting the reactive control target according to the correction value of the reactive control instruction of the phase modulator, then judging whether the reactive control target is larger than the upper limit of the amplitude limit, and if the reactive control target is larger than the upper limit of the amplitude limit, skipping to execute the step 4) to adjust the reactive control instruction according to a mode of putting a group of filters; otherwise, jumping to execute the step 10);
9) calculating the actual second control voltage deviation at present as Δ Uc4The second control voltage deviation is set to be delta Uc4Corresponding reactive power control value Qc4As a correction value of the reactive control instruction of the phase modulator, correcting the reactive control target according to the correction value of the reactive control instruction of the phase modulator, then judging whether the reactive control target is smaller than the lower limit of the amplitude limit, and if the reactive control target is smaller than the lower limit of the amplitude limit, skipping to execute the step 5) to correct the reactive control target of the phase modulator in a mode of cutting off a group of filters; otherwise, jumping to execute the step 10);
10) and (4) locking a switching instruction of the capacitor and the reactor, updating a reactive control target of the phase modulator, ending the control period, and exiting to enter the next period.
Preferably, the current actual first control voltage deviation Δ Uc is calculated in step 8)3The functional expression of (a) is represented by the formula (7); calculating a currently actual second control voltage deviation Δ Uc in step 9)4The functional expression of (a) is represented by the formula (8);
ΔUc3= U0-Ug （7）
ΔUc4= Ug-U0 （8）
in equations (7) and (8), U0 is the initial bus voltage target value, and Ug is the current bus voltage actual value.
Preferably, the first control voltage deviation in step 8) is Δ Uc3Corresponding reactive power control value Qc3The formula (9) is shown in the following formula; the second control voltage deviation in step 9) is Δ Uc4Corresponding reactive power control value Qc4The expression of the calculation function of (a) is shown as formula (10);
Qc3=ΔUc3/(Sd-∑Q) （9）
Qc4=ΔUc4/(Sd-∑Q) （10）
in the formulae (9) and (10), Δ Uc3Is a first control voltage deviation, Δ Uc4For the second control voltage deviation, Sd is the short-circuit capacity of the ac bus of the converter station, and Σ Q is the total reactive power provided by the current filter bank including the reactors.
Preferably, the function expression of the reactive power control target is corrected according to the correction value of the reactive power control instruction of the phase modulator in the step 8) and the step 9) as shown in the formula (11);
Qref(i+1)=Qref(i)+ ΔQ2（11）
in the equation (11), Qref (i +1) is a reactive power control target of the phase modulation machine after the correction, Qref (i) is a reactive power control target of the phase modulation machine before the correction, and Δ Q2To the correction amount, and the correction amount DeltaQ used when correcting the reactive control target in step 8) based on the correction value of the reactive control command of the phase modulator2Satisfies Δ Q2= Qc3And 9) correcting quantity delta Q used when the reactive power control target is corrected according to the correcting value of the reactive power control instruction of the phase modulator2Satisfies Δ Q2=- Qc4Wherein Qc3For a first control voltage deviation of Δ Uc3Corresponding reactive control value, Qc4For the second control voltage deviation to Δ Uc4Corresponding reactive control value.
Preferably, the upper limit of the amplitude limit in the step 8) is the difference between the capacity of a group of filters and the capacity of a group of reactors; the lower limit of the amplitude limit in the step 9) is an allowable phase advance value of the phase modifier at the current active operating point determined according to the phase advance test.
The invention also provides a phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control system which comprises computer equipment, wherein the computer equipment is programmed to execute the steps of the phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method.
Compared with the prior art, the invention has the following advantages:
1) the phase modulator and the voltage reactive power coordination control method for the extra-high voltage direct current converter station do not change the switching control strategy (reactive power control strategy of a direct current control protection system) of an alternating current filter bank and the control strategy of the phase modulator, and are convenient to implement.
2) According to the phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method, the reactive power output of the phase modulator is controlled through the coordination control system, so that voltage fluctuation during switching of the filter bank can be reduced, and voltage impact is reduced.
3) When the phase modulator can use steady state reactive power to replace reactive power variable quantity caused by switching of an alternating current capacitor bank, the phase modulator and the voltage reactive power coordinated control method of the extra-high voltage direct current converter station are replaced by the phase modulator as reactive power output, switching times of a capacitor and a reactor can be reduced, and the service lives of the capacitor and the reactor are prolonged.
4) The phase modulator and the voltage reactive power coordination control method for the extra-high voltage direct current converter station set corresponding limit values for the steady-state reactive power output of the phase modulator, and fully consider the dynamic reactive power compensation requirement of the phase modulator and the operation safety.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the implementation steps of the method for coordinated voltage and reactive power control of the phase modulator and the extra-high voltage direct current converter station in this embodiment include:
1) when the direct-current power transmission starting operation and the phase modulator are stable in operation, skipping to execute the step 2);
2) judging whether the direct-current power transmission control has a switching filter instruction, and if the direct-current power transmission control has the switching filter instruction, skipping to execute the step 3);
3) judging whether the switching filter instruction is a filter switching instruction, and if so, skipping to execute the step 4); if the instruction is a cut filter instruction, skipping to execute the step 5);
4) calculating a first deviation delta Uc between the estimated target voltage and the initial voltage target after one group of filters is put into and corresponding reactors are switched1Obtaining a first deviation delta Uc between the estimated target voltage and the initial voltage target1Corresponding reactive power Qc1As a reactive control target correction of the phase modifier, correcting the reactive control target of the phase modifier according to the reactive control target correction of the phase modifier, and carrying out amplitude limiting processing on the corrected reactive control target of the phase modifier; skipping and executing step 6);
5) calculating a second deviation delta Uc between the estimated target voltage and the initial voltage target after one group of filters are cut off and the corresponding reactors are switched2Obtaining a second deviation delta Uc between the estimated target voltage and the initial voltage target2Corresponding reactive power Qc2As a reactive control target correction of the phase modifier, correcting the reactive control target of the phase modifier according to the reactive control target correction of the phase modifier, and carrying out amplitude limiting processing on the corrected reactive control target of the phase modifier;
6) and updating the reactive control target of the phase modulator, ending the control period, and exiting to enter the next period.
In this embodiment, the first deviation Δ Uc between the target voltage and the initial voltage target is estimated in step 4)1The functional expression of (a) is represented by the formula (1); estimating a second deviation delta Uc between the target voltage and the initial voltage target in the step 5)2The functional expression of (a) is represented by the formula (2);
ΔUc1=Ug+ΔU-U0 （1）
in the formula (1), Ug is the actual value of the current bus voltage, Δ U is the voltage deviation converted to the ac bus according to the total reactive variable Δ Q corresponding to the filter input and the reactor input, and U0 is the target value of the initial bus voltage; the function expression of the voltage deviation delta U of the alternating current bus is shown as a formula (3);
ΔUc2= U0-(Ug-ΔU) （2）
in the formula (2), U0 is an initial bus voltage target value, Ug is a current bus voltage actual value, Delta U is a voltage deviation converted to an alternating current bus according to total reactive power variation Delta Q corresponding to filter input and reactor switching, and a functional expression of the voltage deviation Delta U of the alternating current bus is shown in a formula (3);
ΔU=ΔQ/(Sd-∑Q) （3）
in the formula (3), Δ Q is a total reactive power variation amount (a filter is regarded as increased reactive power, and a reactor is regarded as decreased reactive power) caused by current filter switching and corresponding reactor switching, Sd is a short-circuit capacity of an alternating current bus of the converter station, and Σ Q is a total reactive power provided by a current filter bank including the reactor.
In this embodiment, the first deviation Δ Uc between the estimated target voltage and the initial voltage target is obtained in step 4)1Corresponding reactive power Qc1The function expression of (2) is shown as the formula (4), and the second deviation delta Uc of the estimated target voltage and the initial voltage target is obtained in the step 5)2Corresponding reactive power Qc2The functional expression of (a) is represented by the formula (5);
Qc1=ΔUc1/(Sd-∑Q) （4）
Qc2=ΔUc2/(Sd-∑Q) （5）
in the formulae (4) and (5), Δ Uc1To estimate a first deviation, Δ Uc, of the target voltage from the initial voltage target2In order to estimate a second deviation between the target voltage and the initial voltage target, Sd is the short-circuit capacity of the alternating-current bus of the converter station, and Sigma Q is the total reactive power provided by the current filter bank containing the reactor.
In the embodiment, the functional expression of the reactive control target of the phase modifier corrected according to the reactive control target correction amount of the phase modifier in the step 4) and the step 5) is shown as the formula (6);
Qref(i+1)=Qref(i)+ΔQ1（6）
in the equation (6), Qref (i +1) is a reactive power control target of the phase modulation machine after the correction, Qref (i) is a reactive power control target of the phase modulation machine before the correction, and Δ Q1To the correction amount, and the correction amount DeltaQ used when correcting the reactive control target of the phase modifier based on the reactive control target correction amount of the phase modifier in step 4)1Satisfies Δ Q1=-Qc1Step 5), correcting quantity delta Q used when correcting the reactive power control target of the phase modifier according to the reactive power control target correcting quantity of the phase modifier1Satisfies Δ Q1=Qc2/2 wherein Qc1To estimate a first deviation Δ Uc between a target voltage and an initial voltage target1Corresponding amount of reactive power, Qc2To estimate a second deviation Δ Uc of the target voltage from the initial voltage target2Corresponding amount of reactive power.
In this embodiment, the performing amplitude limiting processing on the modified reactive control target of the phase modulator in step 4) and step 5) specifically includes: firstly, judging whether a reactive power control target Qref (i +1) of the phase modifier after being corrected is greater than a preset reactive power control target upper limit value Qmax, if so, assigning the reactive power control target Qref (i +1) of the phase modifier after being corrected to the preset reactive power control target upper limit value Qmax, otherwise, keeping the reactive power control target Qref (i +1) of the phase modifier after being corrected unchanged; and then judging whether the reactive power control target Qref (i +1) of the phase modifier after being corrected is smaller than a preset reactive power control target lower limit value Qmin or not, if so, assigning the reactive power control target Qref (i +1) of the phase modifier after being corrected to the preset reactive power control target lower limit value Qmin, otherwise, keeping the reactive power control target Qref (i +1) of the phase modifier after being corrected unchanged.
In this embodiment, the current actual first control voltage deviation is calculated as Δ Uc in step 8)3The functional expression of (a) is represented by the formula (7); calculating a currently actual second control voltage deviation Δ Uc in step 9)4The functional expression of (a) is represented by the formula (8);
ΔUc3= U0-Ug （7）
ΔUc4= Ug-U0 （8）
in equations (7) and (8), U0 is the initial bus voltage target value, and Ug is the current bus voltage actual value.
In this embodiment, the preset reactive power control target upper limit value Qmax is a difference between a group of filter capacities and a group of reactor capacities (i.e., Qmax = Q)Capacitor with a capacitor element-QReactance) (ii) a The preset lower limit value Qmin of the reactive power control target is an allowable phase advance value (namely Qmin = Q) of the phase modulator at the current active operating point determined according to a phase advance testAdvancing phase）。
In this embodiment, the switching strategy of the extra-high voltage direct current control protection alternating current filter is kept unchanged in step 1), and the phase modulator works in a reactive closed loop mode.
In this embodiment, step 2) further includes determining whether there is a switching capacitor instruction for the dc power transmission control, and if there is a switching capacitor instruction, skipping to execute step 7):
7) judging whether the switched capacitor instruction is a capacitor throwing instruction, and if the switched capacitor instruction is the capacitor throwing instruction, skipping to execute the step 8); if the instruction is a capacitor cutting instruction, skipping to execute the step 9);
8) calculating the actual first control voltage deviation at present as Δ Uc3The first control voltage deviation is set to Δ Uc3Corresponding reactive power control value Qc3As a correction value of the reactive control instruction of the phase modulator, correcting the reactive control target according to the correction value of the reactive control instruction of the phase modulator, then judging whether the reactive control target is larger than the upper limit of the amplitude limit, and if the reactive control target is larger than the upper limit of the amplitude limit, skipping to execute the step 4) to adjust the reactive control instruction according to a mode of putting a group of filters; otherwise, jumping to execute the step 10);
9) calculating the actual second control voltage deviation at present as Δ Uc4The second control voltage deviation is set to be delta Uc4Corresponding reactive power control value Qc4As a correction value for the reactive control instruction of the phase modulator,correcting the reactive control target according to the correction value of the reactive control instruction of the phase modulator, then judging whether the reactive control target is smaller than the lower limit of amplitude limiting, and if the reactive control target is smaller than the lower limit of amplitude limiting, skipping to execute the step 5) to correct the reactive control target of the phase modulator in a mode of cutting off a group of filters; otherwise, jumping to execute the step 10);
10) and (4) locking a switching instruction of the capacitor and the reactor, updating a reactive control target of the phase modulator, ending the control period, and exiting to enter the next period.
In this embodiment, the first control voltage deviation in step 8) is Δ Uc3Corresponding reactive power control value Qc3The formula (9) is shown in the following formula; the second control voltage deviation in step 9) is Δ Uc4Corresponding reactive power control value Qc4The expression of the calculation function of (a) is shown as formula (10);
Qc3=ΔUc3/(Sd-∑Q) （9）
Qc4=ΔUc4/(Sd-∑Q) （10）
in the formulae (9) and (10), Δ Uc3Is a first control voltage deviation, Δ Uc4For the second control voltage deviation, Sd is the short-circuit capacity of the ac bus of the converter station, and Σ Q is the total reactive power provided by the current filter bank including the reactors.
In the embodiment, the function expression of the reactive power control target is corrected according to the correction value of the reactive power control instruction of the phase modulator in the step 8) and the step 9) as shown in the formula (11);
Qref(i+1)=Qref(i)+ ΔQ2（11）
in the equation (11), Qref (i +1) is a reactive power control target of the phase modulation machine after the correction, Qref (i) is a reactive power control target of the phase modulation machine before the correction, and Δ Q2To the correction amount, and the correction amount DeltaQ used when correcting the reactive control target in step 8) based on the correction value of the reactive control command of the phase modulator2Satisfies Δ Q2= Qc3And 9) correcting the reactive power control object according to the correction value of the reactive power control instruction of the phase modulatorCorrection amount Δ Q used in calibration2Satisfies Δ Q2=- Qc4Wherein Qc3For a first control voltage deviation of Δ Uc3Corresponding reactive control value, Qc4For the second control voltage deviation to Δ Uc4Corresponding reactive control value.
In this embodiment, the upper limit of the amplitude limit in step 8) is the difference between the capacity of a small group of filters and the capacity of a group of reactors (i.e., Qmax = Q)Capacitor with a capacitor element-QReactance) (ii) a The lower limit of amplitude limit in the step 9) is an allowable phase advance value (namely Qmin = Q) of the phase modulator at the current active operating point determined according to a phase advance testAdvancing phase）。
In this embodiment, a dc converter station and a phase modulator coordinated reactive power control system (hereinafter referred to as a coordination control system) are specifically constructed, a switching strategy of an ac filter bank of a dc control protection system is kept unchanged, the coordination control system obtains a switching instruction, a running mode, related control parameters and a running state of the phase modulator of a filter and a reactor bank of a dc control protection, a control target of the phase modulator is adjusted according to the switching instruction of the dc control protection, and an ac capacitor and a reactor switching instruction output by the dc control protection are intervened. The phase modulator and the voltage reactive power coordination control method for the extra-high voltage direct current converter station are convenient to implement because the switching control strategy (the reactive power control strategy of a direct current control protection system) of an alternating current filter bank and the control strategy of the phase modulator are not changed; the reactive output of the phase modulator is controlled by the coordination control system, so that the voltage fluctuation during switching of the filter bank can be reduced, and the voltage impact is reduced; when the phase modulator can use steady state reactive power to replace reactive power variable quantity caused by switching of an alternating current capacitor bank, the phase modulator is used for replacing reactive power output, switching times of a capacitor and a reactor can be reduced, and the service lives of the capacitor and the reactor are prolonged; the phase modulator steady-state reactive output sets a corresponding limit value, and the dynamic reactive compensation requirement and the operation safety of the phase modulator are fully considered.
The phase modulator and reactive power coordination control method for the voltage of the extra-high voltage direct current converter station is based on the extra-high voltage direct current transmission reactive power control and the existing control mode of the phase modulator, bus voltage fluctuation caused by switching of an alternating current filter bank can be reduced, switching times of a capacitor and a reactor bank can be reduced under a certain working condition, the service lives of the alternating current capacitor and the reactor are prolonged, meanwhile, direct current control protection and internal control logic of the phase modulator do not need to be changed, and the implementation is convenient.
In addition, the present embodiment further provides a system for reactive power coordination control of a phase modulator and an extra-high voltage dc converter station voltage, which includes a computer device programmed to execute the steps of the method for reactive power coordination control of a phase modulator and an extra-high voltage dc converter station voltage according to the present embodiment.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (12)

1. A phase modulator and voltage reactive power coordination control method for an extra-high voltage direct current converter station is characterized by comprising the following implementation steps:
1) when the direct-current power transmission starting operation and the phase modulator are stable in operation, skipping to execute the step 2);
2) judging whether the direct-current power transmission control has a switching filter instruction, and if the direct-current power transmission control has the switching filter instruction, skipping to execute the step 3);
3) judging whether the switching filter instruction is a filter switching instruction, and if so, skipping to execute the step 4); if the instruction is a cut filter instruction, skipping to execute the step 5);
4) calculating a first deviation delta Uc between the estimated target voltage and the initial voltage target after one group of filters is put into and corresponding reactors are switched1Obtaining a first deviation delta Uc between the estimated target voltage and the initial voltage target1Corresponding reactive power Qc1As a reactive control target correction of the phase modifier, correcting the reactive control target of the phase modifier according to the reactive control target correction of the phase modifier, and carrying out amplitude limiting processing on the corrected reactive control target of the phase modifier; skipping and executing step 6);
5) calculating a second deviation delta Uc between the estimated target voltage and the initial voltage target after one group of filters are cut off and the corresponding reactors are switched2Obtaining a second deviation delta Uc between the estimated target voltage and the initial voltage target2Corresponding reactive power Qc2As a reactive control target correction of the phase modifier, correcting the reactive control target of the phase modifier according to the reactive control target correction of the phase modifier, and carrying out amplitude limiting processing on the corrected reactive control target of the phase modifier;
6) updating the reactive control target of the phase modulator, ending the control period, and exiting to enter the next period;
estimating a first deviation delta Uc between the target voltage and the initial voltage target in the step 4)1The functional expression of (a) is represented by the formula (1); estimating a second deviation delta Uc between the target voltage and the initial voltage target in the step 5)2The functional expression of (a) is represented by the formula (2);
ΔUc1=Ug+ΔU-U0 （1）
in the formula (1), Ug is a current bus voltage value, Δ U is a voltage deviation converted to an ac bus according to a total reactive power variation Δ Q corresponding to filter input and reactor switching, and U0 is an initial bus voltage target value; the function expression of the voltage deviation delta U of the alternating current bus is shown as a formula (3);
ΔUc2= U0-(Ug-ΔU) （2）
in the formula (2), U0 is an initial bus voltage target value, Ug is a current bus voltage value, Delta U is a voltage deviation converted to an alternating current bus according to total reactive power variation Delta Q corresponding to filter cutting and reactor switching, and a functional expression of the voltage deviation Delta U of the alternating current bus is shown in a formula (3);
ΔU=ΔQ/(Sd-∑Q) （3）
in the formula (3), Δ Q is a total reactive power variation caused by switching of the current filter and switching of the corresponding reactor, Sd is a short-circuit capacity of an alternating-current bus of the converter station, and Σ Q is a total reactive power provided by the current filter bank including the reactor.
2. The phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method according to claim 1, characterized in that in step 4), a first deviation Δ Uc between an estimated target voltage and an initial voltage target is obtained1Corresponding reactive power Qc1The function expression of (2) is shown as the formula (4), and the second deviation delta Uc of the estimated target voltage and the initial voltage target is obtained in the step 5)2Corresponding reactive power Qc2The functional expression of (a) is represented by the formula (5);
Qc1=ΔUc1/(Sd-∑Q) （4）
Qc2=ΔUc2/(Sd-∑Q) （5）
in the formulae (4) and (5), Δ Uc1To estimate a first deviation, Δ Uc, of the target voltage from the initial voltage target2In order to estimate a second deviation between the target voltage and the initial voltage target, Sd is the short-circuit capacity of the alternating-current bus of the converter station, and Sigma Q is the total reactive power provided by the current filter bank containing the reactor.
3. The phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method according to claim 1, characterized in that the functional expression of the reactive power control target of the phase modulator is modified according to the reactive power control target correction quantity of the phase modulator in the step 4) and the step 5) is as shown in the formula (6);
Qref(i+1)=Qref(i)+ΔQ1（6）
in the equation (6), Qref (i +1) is a reactive power control target of the phase modulation machine after the correction, Qref (i) is a reactive power control target of the phase modulation machine before the correction, and Δ Q1To the correction amount, and the correction amount DeltaQ used when correcting the reactive control target of the phase modifier based on the reactive control target correction amount of the phase modifier in step 4)1Satisfies Δ Q1=-Qc1Step 5), correcting quantity delta Q used when correcting the reactive power control target of the phase modifier according to the reactive power control target correcting quantity of the phase modifier1Satisfies Δ Q1=Qc2/2 wherein Qc1To estimate a first deviation Δ Uc between a target voltage and an initial voltage target1Corresponding amount of reactive power, Qc2To estimate a second deviation Δ Uc of the target voltage from the initial voltage target2Corresponding amount of reactive power.
4. The phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method according to claim 1, wherein the step 4) and the step 5) of performing amplitude limiting processing on the reactive power control target of the modified phase modulator specifically means that: firstly, judging whether a reactive power control target Qref (i +1) of the phase modifier after being corrected is greater than a preset reactive power control target upper limit value Qmax, if so, assigning the reactive power control target Qref (i +1) of the phase modifier after being corrected to the preset reactive power control target upper limit value Qmax, otherwise, keeping the reactive power control target Qref (i +1) of the phase modifier after being corrected unchanged; and then judging whether the reactive power control target Qref (i +1) of the phase modifier after being corrected is smaller than a preset reactive power control target lower limit value Qmin or not, if so, assigning the reactive power control target Qref (i +1) of the phase modifier after being corrected to the preset reactive power control target lower limit value Qmin, otherwise, keeping the reactive power control target Qref (i +1) of the phase modifier after being corrected unchanged.
5. The phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method according to claim 4, characterized in that the preset reactive power control target upper limit value Qmax is a difference value between a group of filter capacities and a group of reactor capacities; the preset reactive power control target lower limit value Qmin is an allowable phase advance value of the phase modifier at the current active operating point determined according to a phase advance test.
6. The phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method according to claim 1, characterized in that in step 1), the switching strategy of the extra-high voltage direct current control protection alternating current filter is kept unchanged, and the phase modulator works in a reactive closed loop mode.
7. The phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method according to any one of claims 1 to 6, characterized in that step 2) further comprises judging whether a switched capacitor instruction exists in direct current transmission control, and if the switched capacitor instruction exists, skipping to execute step 7):
7) judging whether the switched capacitor instruction is a capacitor throwing instruction, and if the switched capacitor instruction is the capacitor throwing instruction, skipping to execute the step 8); if the instruction is a capacitor cutting instruction, skipping to execute the step 9);
8) calculating the actual first control voltage deviation at present as Δ Uc3The first control voltage deviation is set to Δ Uc3Corresponding reactive power control value Qc3As a correction value of the reactive control instruction of the phase modulator, correcting the reactive control target according to the correction value of the reactive control instruction of the phase modulator, then judging whether the reactive control target is larger than the upper limit of the amplitude limit, and if the reactive control target is larger than the upper limit of the amplitude limit, skipping to execute the step 4) to adjust the reactive control instruction according to a mode of putting a group of filters; otherwise, jumping to execute the step 10);
9) calculating the actual second control voltage deviation at present as Δ Uc4The second control voltage deviation is set to be delta Uc4Corresponding reactive power control value Qc4As a correction value of the reactive power control instruction of the phase modulator, correcting the reactive power control target according to the correction value of the reactive power control instruction of the phase modulator,then judging whether the reactive control target is smaller than the lower limit of amplitude limiting, if so, skipping to execute the step 5) to correct the reactive control target of the phase modulator in a mode of cutting off a group of filters; otherwise, jumping to execute the step 10);
10) and (4) locking a switching instruction of the capacitor and the reactor, updating a reactive control target of the phase modulator, ending the control period, and exiting to enter the next period.
8. The phase modulator and UHV DC converter station voltage reactive power coordination control method according to claim 7, characterized in that in step 8), the current actual first control voltage deviation is calculated as Δ Uc3The functional expression of (a) is represented by the formula (7); calculating a currently actual second control voltage deviation Δ Uc in step 9)4The functional expression of (a) is represented by the formula (8);
ΔUc3= U0-Ug （7）
ΔUc4= Ug-U0 （8）
in equations (7) and (8), U0 is the initial bus voltage target value, and Ug is the current bus voltage actual value.
9. The phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method according to claim 7, characterized in that in step 8), the first control voltage deviation is Δ Uc3Corresponding reactive power control value Qc3The formula (9) is shown in the following formula; the second control voltage deviation in step 9) is Δ Uc4Corresponding reactive power control value Qc4The expression of the calculation function of (a) is shown as formula (10);
Qc3=ΔUc3/(Sd-∑Q) （9）
Qc4=ΔUc4/(Sd-∑Q) （10）
in the formulae (9) and (10), Δ Uc3Is a first control voltage deviation, Δ Uc4For a second control voltage deviation, Sd isThe short-circuit capacity, Σ Q, of the converter station ac bus provides the total reactive power for the current filter bank including the reactors.
10. The phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method according to claim 7, characterized in that the functional expression of the reactive power control target corrected according to the correction value of the reactive power control instruction of the phase modulator in step 8) and step 9) is as shown in formula (11);
Qref(i+1)=Qref(i)+ ΔQ2（11）
in the equation (11), Qref (i +1) is a reactive power control target of the phase modulation machine after the correction, Qref (i) is a reactive power control target of the phase modulation machine before the correction, and Δ Q2To the correction amount, and the correction amount DeltaQ used when correcting the reactive control target in step 8) based on the correction value of the reactive control command of the phase modulator2Satisfies Δ Q2= Qc3And 9) correcting quantity delta Q used when the reactive power control target is corrected according to the correcting value of the reactive power control instruction of the phase modulator2Satisfies Δ Q2=- Qc4Wherein Qc3For a first control voltage deviation of Δ Uc3Corresponding reactive control value, Qc4For the second control voltage deviation to Δ Uc4Corresponding reactive control value.
11. The phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method according to claim 7, characterized in that the upper limit of the amplitude limit in step 8) is the difference value between the capacity of a group of filters and the capacity of a group of reactors; the lower limit of the amplitude limit in the step 9) is an allowable phase advance value of the phase modifier at the current active operating point determined according to the phase advance test.
12. A phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control system comprising computer equipment, wherein the computer equipment is programmed to execute the steps of the phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method according to any one of claims 1 to 11.
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