CN111799831A - Phase modulator and converter transformer on-load voltage regulation tap coordination control method and system - Google Patents

Phase modulator and converter transformer on-load voltage regulation tap coordination control method and system Download PDF

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Publication number
CN111799831A
CN111799831A CN202010532842.7A CN202010532842A CN111799831A CN 111799831 A CN111799831 A CN 111799831A CN 202010532842 A CN202010532842 A CN 202010532842A CN 111799831 A CN111799831 A CN 111799831A
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China
Prior art keywords
trigger angle
phase modulator
converter transformer
coordination control
excitation
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CN202010532842.7A
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Chinese (zh)
Inventor
吴维宁
许其品
杨铭
邓小君
徐蓉
刘丽丽
朱宏超
袁亚洲
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Nari Technology Co Ltd
State Grid Electric Power Research Institute
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Nari Technology Co Ltd
State Grid Electric Power Research Institute
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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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • H02P9/36—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using armature-reaction-excited machines
    • 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 modifier and converter transformer on-load voltage regulation tap coordination control method and system in the technical field of motor excitation control, and aims to solve the technical problems that in the prior art, the on-load voltage regulation tap of a converter transformer has frequent tap action and reduced service life due to fluctuation of alternating-current bus voltage. The method comprises the following steps: acquiring a trigger angle of a converter valve of a direct current transmission system; acquiring an excitation voltage deviation increment according to the difference value of the acquired trigger angle and the trigger angle given value; and superposing the excitation voltage deviation increment and the given value of the terminal voltage of the phase modulator. The characteristic of continuous smooth adjustment of the phase modulator is utilized, the action times of the on-load voltage regulation tap joint of the converter transformer are effectively reduced, and therefore the service life of the on-load voltage regulation switch of the converter is prolonged.

Description

Phase modulator and converter transformer on-load voltage regulation tap coordination control method and system
Technical Field
The invention belongs to the technical field of motor excitation control, and particularly relates to a phase modulator and on-load voltage regulation tap joint coordination control method and system for a converter transformer.
Background
Along with large-scale development of clean energy and high-speed development of an alternating-current and direct-current extra-high voltage power grid, the characteristics of the power grid are greatly changed, the problems of reduction of dynamic reactive power reserves and insufficient voltage supporting capability in partial regions are more and more prominent, and the problem of voltage stability becomes a main problem of safety and stability of the large power grid. Compared with dynamic reactive power compensation devices based on power electronic technology, such as SVC (static var compensator), STATCOM (static var compensator) and the like, the novel high-capacity phase modulator directly improves the short-circuit capacity of the power grid, and has the advantages of strong short-time overload capacity, excellent high/low voltage ride-through capacity, strong dynamic voltage supporting capacity, small influence on the adjusting capacity of the system, and capability of meeting the requirements of the system on dynamic reactive power compensation. The new generation phase modulator is more suitable for the power grid structure characteristics of large transmission capacity, insufficient transmitting end short circuit capacity and insufficient voltage supporting capacity under the condition of multi-loop direct current concentrated feed-in of receiving ends, and can play an important role in cross-regional consumption of clean energy and power balance and mutual assistance of the whole power grid.
The converter transformer is a key device which is crucial in the ultra-high voltage direct current transmission project, and is a core device of interfaces at two ends of rectification and inversion in an alternating current transmission system and a direct current transmission system. The investment and safe operation of the system are key and important guarantees for obtaining power generation benefits in engineering. The converter transformer is required to have high reliability and high technical performance due to the key function. Because of the combined action of the alternating current electric field, the direct current electric field and the magnetic field, the converter transformer has special and complex structure, high key technology and strict requirements on manufacturing environment and processing quality. The on-load voltage regulation tap of the converter transformer can cause frequent tap action and reduced service life due to the fluctuation of the alternating-current bus voltage.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a phase modifier and on-load tap changing control method and system of a converter transformer, which can effectively reduce the action times of the on-load tap changing tap of the converter transformer in the process of changing the voltage of an alternating-current bus, thereby prolonging the service life of the on-load tap changing switch of the converter transformer.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a phase modifier and on-load tap changing control method of a converter transformer comprises the following steps: acquiring a trigger angle of a converter valve of a direct current transmission system; acquiring an excitation voltage deviation increment according to the difference value of the acquired trigger angle and the trigger angle given value; and superposing the excitation voltage deviation increment and the given value of the terminal voltage of the phase modulator.
Furthermore, the phase modulator adopts a control mode of superposing a reactive ring by an electric pressure ring.
Further, the method for obtaining the excitation voltage deviation increment comprises the following steps: if the collected trigger angle is in the set interval, locking and outputting; if the collected trigger angle is not in the set interval, performing PID calculation on the difference value between the collected trigger angle and the trigger angle given value to obtain an excitation voltage deviation increment delta U'ref：
Figure BDA0002535994650000021
R(s)＝L[αref-α(t)](2)
Wherein L is-1[]Denotes subjecting the parameter to inverse Lagrange transformation, L [, ]]Representing the Laplace transform of a parameter, R(s) tableShows the result, K, obtained after the parameters have been subjected to the Ralsberg transformPIndicating the proportionality coefficient of the PID calculation, KIIntegral coefficient, K, representing PID calculationDA differential coefficient representing PID calculation, s represents a complex variable, alpha (t) represents a trigger angle acquired at time t, and alpharefIndicating a firing angle setpoint.
Further, the set interval is [12.5,17.5 ].
A phase modifier and on-load voltage regulation tap coordination control system of a converter transformer comprises a coordination control system and a synchronous phase modifier excitation system, wherein the coordination control system acquires a trigger angle of a converter valve of a direct-current transmission system in real time and acquires an excitation voltage deviation increment according to a difference value of the acquired trigger angle and a trigger angle set value, the coordination control system transmits the excitation voltage deviation increment to the synchronous phase modifier excitation system, and the synchronous phase modifier excitation system superposes the excitation voltage deviation increment and a phase modifier terminal voltage set value.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the excitation voltage deviation increment is obtained through the trigger angle of the converter valve of the direct-current power transmission system and the trigger angle given value deviation; superposing the bias increment of the excitation voltage and the given value of the terminal voltage of the phase modulator; when the bus voltage changes slowly, the characteristic of continuous smooth adjustment of the phase modulator is utilized, the action times of the on-load voltage regulation tap joint of the converter transformer are effectively reduced, and therefore the service life of the on-load voltage regulation switch of the converter is prolonged.
Drawings
Fig. 1 is a schematic diagram of a phase modifier and a converter transformer on-load tap-changer coordination control logic according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a coordination control strategy of a phase modulation machine and a converter transformer on-load tap changer according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
as shown in fig. 1 to 2, a method for coordinating and controlling a phase modifier and a converter transformer on-load tap changer includes: acquiring a trigger angle of a converter valve of a direct current transmission system; acquiring an excitation voltage deviation increment according to the acquired trigger angle and the trigger angle given value deviation; and superposing the excitation voltage deviation increment and the given value of the terminal voltage of the phase modulator.
In this embodiment, the phase modulator adopts a control mode of superposing the voltage ring on the reactive power ring, so that the reactive power can be stabilized within a certain range in a steady state, and conditions are created for the coordination control of the phase modulator and the existing reactive power compensation equipment of the converter station in the dynamic/steady state process of the power grid. Detecting and acquiring the trigger angle alpha of a converter valve of a direct current transmission system in real time, and setting a trigger angle alpha according to the acquired trigger angle alpha and the trigger anglerefThe difference value of (2) is used for calculating the deviation increment of the excitation voltage, and specifically comprises the following steps: if the collected trigger angle is in the set interval, locking and outputting; if the collected trigger angle is not in the set interval, performing PID calculation on the difference value between the collected trigger angle and the trigger angle given value to obtain an excitation voltage deviation increment delta U'ref：
Figure BDA0002535994650000041
R(s)＝L[αref-α(t)](2)
Wherein L is-1[]Denotes subjecting the parameter to inverse Lagrange transformation, L [, ]]Representing the parameters subjected to the Laplace transform, R(s) representing the result obtained after the parameters subjected to the Laplace transform, KPIndicating the proportionality coefficient of the PID calculation, KIIntegral coefficient, K, representing PID calculationDA differential coefficient representing PID calculation, s represents a complex variable, alpha (t) represents a trigger angle acquired at time t, and alpharefIndicating a firing angle setpoint.
The excitation voltage deviation increment and the phase modulator terminal voltage given value are overlapped, namely, the excitation voltage deviation increment and the phase modulator terminal voltage given value are subjected to algebraic summation to serve as a new phase modulator terminal voltage, and the action times of the converter transformer on-load voltage regulation tap joint are reduced by utilizing the smooth reactive power regulation capacity of the phase modulator, so that the service life of the converter on-load voltage regulation switch is prolonged.
Example two:
based on the coordination control method for the phase modulator and the on-load tap changer of the converter transformer described in the first embodiment, the present embodiment provides a coordination control system for the phase modulator and the on-load tap changer of the converter transformer, as shown in fig. 1 to 2, the coordination control system includes a coordination control system and a synchronous phase modulator excitation system, the coordination control system collects the trigger angle α of the converter valve of the dc power transmission system in real time, and according to the collected trigger angle α and the trigger angle set value α, the coordination control system collects the trigger angle α of the converter valve of the dc power transmission systemrefObtaining an excitation voltage deviation increment delta U 'from the difference value'refThe coordinated control system increments the excitation voltage deviation by delta U'refIs transmitted to an excitation system of a synchronous phase modulator, and the excitation system of the synchronous phase modulator carries out deviation increment delta U of excitation voltage'refAnd superposing with the terminal voltage given value of the phase modulator.
Obtaining excitation voltage deviation increment delta U'refThe method specifically comprises the following steps: if the collected trigger angle is in the set interval, locking and outputting; if the collected trigger angle is not in the set interval, performing PID calculation on the difference value between the collected trigger angle and the trigger angle given value to obtain an excitation voltage deviation increment delta U'ref：
Figure BDA0002535994650000051
R(s)＝L[αref-α(t)](2)
Wherein L is-1[]Denotes subjecting the parameter to inverse Lagrange transformation, L [, ]]Representing the parameters subjected to the Laplace transform, R(s) representing the result obtained after the parameters subjected to the Laplace transform, KPIndicating the proportionality coefficient of the PID calculation, KIIntegral coefficient, K, representing PID calculationDA differential coefficient representing PID calculation, s represents a complex variable, alpha (t) represents a trigger angle acquired at time t, and alpharefIndicating a firing angle setpoint. In this example, the set interval is [12.5,17.5]]The interval may vary according to the specific application environment.
Increment the excitation voltage deviation by deltaU′refSuperposed with the given value of the terminal voltage of the phase modulator, namely the deviation increment delta U 'of the excitation voltage'refAlgebraic summation is carried out on the set value of the terminal voltage of the phase modulator and the algebraic summation is used as a new terminal voltage of the phase modulator, so that the terminal voltage of the phase modulator is adjusted, and the number of times of on-load voltage regulation actions under the condition of small disturbance is reduced by utilizing the smooth reactive power regulation.
In this embodiment, the phase modulator adopts a control mode of superposing the voltage ring on the reactive power ring, so that the reactive power can be stabilized within a certain range in a steady state, and conditions are created for the coordination control of the phase modulator and the existing reactive power compensation equipment of the converter station in the dynamic/steady state process of the power grid. Taking a 300Mvar phase modulator as an example, when the phase modulator is installed in a transmitting end converter station, the phase modulator generally operates at a steady state near Q-250 Mvar, and when the phase modulator is installed at a receiving end, the phase modulator generally operates at a steady state near Q-50 Mvar, so that conditions are created for the coordination control of the phase modulator and the existing reactive compensation equipment of the converter station in the dynamic/steady state process of a power grid; when the bus voltage changes slowly, the characteristic of continuous smooth regulation of the phase regulator is utilized to reduce the action times of the on-load voltage regulation tap of the converter transformer, thereby prolonging the service life of the on-load voltage regulation switch of the converter.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A phase modifier and on-load voltage regulation tap joint coordination control method of a converter transformer is characterized by comprising the following steps:
acquiring a trigger angle of a converter valve of a direct current transmission system;
acquiring an excitation voltage deviation increment according to the difference value of the acquired trigger angle and the trigger angle given value;
and superposing the excitation voltage deviation increment and the given value of the terminal voltage of the phase modulator.
2. The method for the coordination control of the phase modulator and the on-load tap changer of the converter transformer as recited in claim 1, wherein the phase modulator adopts a control mode of superposing a reactive loop by an electric pressure loop.
3. The method for the coordinated control of the phase modulator and the converter transformer on-load tap according to claim 1, wherein the method for obtaining the excitation voltage deviation increment comprises the following steps:
if the collected trigger angle is in the set interval, locking and outputting;
if the collected trigger angle is not in the set interval, carrying out PID calculation on the difference value between the collected trigger angle and the trigger angle given value to obtain the excitation voltage deviation incrementΔU′ref：
Figure FDA0002535994640000011
R(s)＝L[αref-α(t)](2)
Wherein L is-1[]Denotes subjecting the parameter to inverse Lagrange transformation, L [, ]]Representing the parameters subjected to the Laplace transform, R(s) representing the result obtained after the parameters subjected to the Laplace transform, KPIndicating the proportionality coefficient of the PID calculation, KIIntegral coefficient, K, representing PID calculationDA differential coefficient representing PID calculation, s represents a complex variable, alpha (t) represents a trigger angle acquired at time t, and alpharefIndicating a firing angle setpoint.
4. The method for coordinating a phase modulator with a converter transformer on-load tap according to claim 3, wherein the set interval is [12.5,17.5 ].
5. A phase modifier and phase change transformer on-load voltage regulation tap coordination control system is characterized by comprising a coordination control system and a synchronous phase modifier excitation system, wherein the coordination control system acquires a trigger angle of a converter valve of a direct current transmission system in real time and acquires an excitation voltage deviation increment according to a difference value of the acquired trigger angle and a trigger angle set value, the coordination control system transmits the excitation voltage deviation increment to the synchronous phase modifier excitation system, and the synchronous phase modifier excitation system superposes the excitation voltage deviation increment and a phase modifier terminal voltage set value.
6. The phase modulator and on-load tap changer coordination control system according to claim 5, wherein said phase modulator uses a control mode of voltage ring superposition reactive ring.
7. The phase modifier and converter transformer on-load tap changer coordinated control system according to claim 5, wherein the method for obtaining the excitation voltage deviation increment comprises the following steps:
if the collected trigger angle is in the set interval, locking and outputting;
if the collected trigger angle is not in the set interval, carrying out PID calculation on the difference value between the collected trigger angle and the trigger angle given value to obtain the excitation voltage deviation incrementΔU′ref：
Figure FDA0002535994640000021
R(s)＝L[αref-α(t)](2)
Wherein L is-1[]Denotes subjecting the parameter to inverse Lagrange transformation, L [, ]]Representing the parameters subjected to the Laplace transform, R(s) representing the result obtained after the parameters subjected to the Laplace transform, KPIndicating the proportionality coefficient of the PID calculation, KIIntegral coefficient, K, representing PID calculationDA differential coefficient representing PID calculation, s represents a complex variable, alpha (t) represents a trigger angle acquired at time t, and alpharefIndicating a firing angle setpoint.
8. The phase modifier and converter transformer on-load tap coordination control system according to claim 7, wherein said set interval is [12.5,17.5 ].
CN202010532842.7A 2020-06-12 2020-06-12 Phase modulator and converter transformer on-load voltage regulation tap coordination control method and system Pending CN111799831A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112968459A (en) * 2021-02-05 2021-06-15 国网山西省电力公司检修分公司 Tap control method based on fixed deviation alternate control of homopolar commutation variable tap
CN112968460A (en) * 2021-02-05 2021-06-15 国网山西省电力公司检修分公司 Method for controlling converter transformer tap based on ALPHA-VDIO _ R coordination control
CN113036771A (en) * 2021-02-24 2021-06-25 国网浙江省电力有限公司 Power grid stability improving method based on excitation system design margin
CN113539709A (en) * 2021-08-11 2021-10-22 国网经济技术研究院有限公司 Method and system for reducing action of rectifying side tap switch of extra-high voltage direct current engineering

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CN109167369A (en) * 2018-07-31 2019-01-08 国网江苏省电力有限公司徐州供电分公司 A kind of idle intelligent compensation system and its compensation method based on magnetic valve type controllable reactor
CN109802399A (en) * 2019-01-24 2019-05-24 重庆大学 Consider phase modifier coordinative role and the UHVDC converter station dynamic reactive power optimization method that system filter requires
CN110970940A (en) * 2019-11-26 2020-04-07 国网电力科学研究院有限公司 Phase modulator excitation system applied to field of direct-current power transmission and control method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016206547A1 (en) * 2015-06-26 2016-12-29 许继电气股份有限公司 Hybrid direct current transmission system
CN109167369A (en) * 2018-07-31 2019-01-08 国网江苏省电力有限公司徐州供电分公司 A kind of idle intelligent compensation system and its compensation method based on magnetic valve type controllable reactor
CN109802399A (en) * 2019-01-24 2019-05-24 重庆大学 Consider phase modifier coordinative role and the UHVDC converter station dynamic reactive power optimization method that system filter requires
CN110970940A (en) * 2019-11-26 2020-04-07 国网电力科学研究院有限公司 Phase modulator excitation system applied to field of direct-current power transmission and control method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112968459A (en) * 2021-02-05 2021-06-15 国网山西省电力公司检修分公司 Tap control method based on fixed deviation alternate control of homopolar commutation variable tap
CN112968460A (en) * 2021-02-05 2021-06-15 国网山西省电力公司检修分公司 Method for controlling converter transformer tap based on ALPHA-VDIO _ R coordination control
CN112968459B (en) * 2021-02-05 2023-05-23 国网山西省电力公司检修分公司 Tap control method based on homopolar converter transformer tap fixed deviation alternating control
CN112968460B (en) * 2021-02-05 2023-05-23 国网山西省电力公司检修分公司 Converter transformer tap control method based on ALPHA-VDIO_R coordination control
CN113036771A (en) * 2021-02-24 2021-06-25 国网浙江省电力有限公司 Power grid stability improving method based on excitation system design margin
CN113539709A (en) * 2021-08-11 2021-10-22 国网经济技术研究院有限公司 Method and system for reducing action of rectifying side tap switch of extra-high voltage direct current engineering

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