CN105552946A - DC voltage control method of flexible ring network controller and control system thereof - Google Patents

DC voltage control method of flexible ring network controller and control system thereof Download PDF

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Publication number
CN105552946A
CN105552946A CN201511024959.XA CN201511024959A CN105552946A CN 105552946 A CN105552946 A CN 105552946A CN 201511024959 A CN201511024959 A CN 201511024959A CN 105552946 A CN105552946 A CN 105552946A
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active power
voltage
active
reference value
conversion station
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CN201511024959.XA
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CN105552946B (en
Inventor
阳岳希
杨杰
庞辉
韩子娇
***
周杨
李铁
许韦华
马巍巍
别晓玉
赵鹏
董鹤楠
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Smart Grid Research Institute of SGCC
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Smart Grid Research Institute of SGCC
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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
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Rectifiers (AREA)

Abstract

The invention relates to an active power control method of a flexible ring network controller and a control system thereof. The method comprises the steps that: a constant DC voltage side generates a DC voltage reference value Udcref; the DC voltage reference value Udcref is generated into an active current reference value of idref-opp after a DC voltage controller PI link; the active current reference value of idref-opp is transmitted by a communication optical fiber to a constant active power side convertor station; the constant active power side convertor station generates an active power reference signal Pref; the constant active power side convertor station receives the active current reference value of idref-opp and transmits the same into an active power controller to serve as an additional control signal; and the constant active power side convertor station generates a positive sequence d axis current reference value id*. According to the active power control method in the technical scheme provided by the invention, the DC voltage signal of a constant DC voltage side convertor station is generated into the additional signal of the active power controller of a constant power control side convertor station via inter-station communication, and the transmission active power of the flexible ring network controller is quickly regulated by the coordination control of the convertor stations of both ends.

Description

A kind of DC voltage control method of flexible ring net controller and control system thereof
Technical field
The present invention relates to the control strategy of flexible ring net controller, be specifically related to a kind of DC voltage control method and control system thereof of flexible ring net controller.
Background technology
Flexible ring net controller is back-to-back flexible direct current, and its Control system architecture is symmetrical, and conventional outer ring controller form has: constant DC voltage control, determine active power controller, determine Reactive Power Control, determine alternating voltage control etc.Constant DC voltage control is extremely important, and for flexible ring net controller system, wherein one end must adopt constant DC voltage control, for active power and the maintenance DC-side Voltage Stabilization of balancing flexible loop network control device system.When the meritorious imbalance of the both sides AC system that flexible ring net controller connects, will cause the fluctuation of direct voltage, now active current then will be charged to DC bus capacitor (or electric discharge), until DC voltage stability is in set point.Therefore, the current conversion station of constant DC voltage control is equivalent to an active balance node.In designed constant DC voltage control device, direct voltage and direct voltage instruction deviation as the reference of active current, and then regulate the direct voltage of flexible ring net controller after PI regulates.
When changing due to operating condition, need flexible ring net controller to promote at short notice or return when falling direct voltage, when the command value of direct voltage is undergone mutation, original control strategy only relies on the current conversion station determining DC voltage side to regulate direct voltage, there is certain time delay in the change response of direct voltage, there is drawback.
Summary of the invention
For solving above-mentioned deficiency of the prior art, the object of this invention is to provide a kind of DC voltage control method and control system thereof of flexible ring net controller, method of the present invention is to provide a kind of method that flexible ring net controller direct voltage rapid coordination based on communication between station controls.
The object of the invention is to adopt following technical proposals to realize:
The invention provides a kind of DC voltage control method of flexible ring net controller, its improvements are, described method comprises the steps:
Step (1): constant DC voltage control side generates direct voltage reference value U dcref;
Step (2): direct voltage reference value U dcrefafter DC voltage controller PI link, generate active current reference value id ref_opp;
Step (3): by active current reference value id ref_oppbe transferred to by communication optical fiber and determine active power side current conversion station;
Step (4): determine the reference signal P that active power controller side current conversion station generates active power ref;
Step (5): determine active power side current conversion station and receive active current reference value id ref_opp, send it in Active Power Controller, as additional control signals;
Step (6): determine active power side current conversion station and generate positive sequence d axle active current reference value i d*.
Further, in described step (1), the DC voltage control module of determining DC voltage side current conversion station receives higher level's direct voltage command value U dcset, by DC voltage regulation link, according to system running state, generate direct voltage reference value U dcref; Design different DC voltage regulation links and upper lower limit value as required.
Further, in described step (2), the converter of constant DC voltage control pattern is adopted to be used for balanced d. c system active power and to keep DC-side Voltage Stabilization; When ignoring R and converter loss, the meritorious maintenance balance of converter alternating current-direct current both sides, namely
P = 3 2 · U s i s d = P d c = u d c i d c
During stable state:
i L = i d c = 3 2 · U s i s d u d c
Wherein: P is AC system active power, U s, i sdbe respectively alternating voltage and active current, P dc, u dc, i dcbe respectively direct voltage, direct current and direct current active power, i lfor direct current during stable state;
When VSC alternating current-direct current both sides meritorious uneven, will cause the fluctuation of direct voltage, now active current then will to DC bus capacitor charge or discharge, until DC voltage stability is in set point; For the converter of constant DC voltage control, be equivalent to an active balance node; In designed constant DC voltage control device, direct voltage and direct voltage instruction deviation after PI regulates as the reference value of active current
Further, in described step (3), utilize communication between station, by active current reference value id ref_opppassed by communication optical fiber and be transferred to offside current conversion station from determining DC voltage side current conversion station, namely determine active power side current conversion station.
Further, in described step (4), the Active Power Controller of determining active power controller side current conversion station receives active power dispatch instruction P set, the reference signal P of active power is generated through meritorious instruction governing loop ref;
Active power dispatch instruction instruction Pset and for power oscillation damping with realize emergency DC power support object modulation marker signal Pm, generate the reference signal Pref of active power through meritorious instruction governing loop (ActivePowerReferenceRegulation), different meritorious instruction governing loops and upper lower limit value can be designed as required.
Further, in described step (6), the reference signal P of active power refactive current reference value is generated, with additional control signals id through Active Power Controller ref_oppbe added, then through amplitude limit link and transform part, generate the positive sequence d axle active current reference value i determining active power side current conversion station d*;
Under three-phase power grid voltage equilibrium condition, the direction of power taking net voltage vector Us is d direction of principal axis, and design outer shroud Active Power Controller, generates active current reference value i sd *_ opp,
P = 3 2 · U s i s d
Wherein: P is AC system active power, U s, i sdbe respectively alternating voltage and active current.
A control system for the DC voltage control method of flexible ring net controller, its improvements are, described control system comprises carries out determining active power side current conversion station and determining DC voltage side current conversion station of communication successively;
Describedly determine active power controller side current conversion station and comprise the active power controller module and outer shroud Active Power Controller module of carrying out communication successively; Active power controller module is for receiving higher level's active power command value P set, active power reference value generation module is for generating active power reference value P ref; Outer shroud Active Power Controller module is according to active power reference value P refgenerate active current reference value i sd * _ opp;
Describedly determine DC voltage side current conversion station and comprise DC voltage control module; Described DC voltage control module is for receiving higher level's direct voltage dispatch command U dcset; And generate the reference signal U of direct voltage dcref.
Compared with immediate prior art, the excellent effect that technical scheme provided by the invention has is:
The invention provides a kind of based on introduce in the Active Power Controller of communication determine DC voltage side current conversion station semaphore as the control strategy of the quick adjustment direct voltage of additional signal, there is following significant effect:
1. the method adopts and utilizes communication that the d. c. voltage signal determining DC voltage side current conversion station is generated the additional signal of the Active Power Controller of constant dc power control side current conversion station, simulation result shows can by the reduction of the transformation period of direct voltage at least about 190ms, control response speed is rapid, successful.
2. the task of controlling direct voltage has been shared two current conversion stations by the method, is born and becomes two current conversion station shareds, the flexibility of control is improved, enhances the ability of system stable operation, improve economy and fail safe by traditional single current conversion station.
Accompanying drawing explanation
Fig. 1 is that provided by the invention introducing based on communication determines DC voltage side additional signal P ref_oppactive Power Controller logic diagram;
Fig. 2 is direct voltage quick adjustment control imitation result figure provided by the invention, wherein: (a) direct voltage command value; (b) direct voltage quick adjustment control effects;
Fig. 3 is the flow chart of the active power controller method of flexible ring net controller provided by the invention;
Fig. 4 provided by the inventionly determines DC voltage side current conversion station and generates direct voltage reference value U dcreflogic diagram;
Fig. 5 is direct voltage provided by the invention and the direct voltage instruction deviation reference value as active current after PI regulates logic diagram;
Fig. 6 is the logic diagram of the reference signal Pref of generation active power provided by the invention;
Fig. 7 is generation active current reference value i provided by the invention sd *the logic diagram of _ opp.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The following description and drawings illustrate specific embodiment of the invention scheme fully, to enable those skilled in the art to put into practice them.Other embodiments can comprise structure, logic, electric, process and other change.Embodiment only represents possible change.Unless explicitly requested, otherwise independent assembly and function are optional, and the order of operation can change.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.The scope of embodiment of the present invention comprises the gamut of claims, and all obtainable equivalent of claims.In this article, these embodiments of the present invention can be represented with term " invention " individually or always, this is only used to conveniently, and if in fact disclose the invention more than, be not the scope that automatically will limit this application is any single invention or inventive concept.
Flexible ring net controller is two voltage source converters with form back-to-back, is attached in AC network transmission line, and by gaining merit to AC system, idle independence controls, and realizes the functions such as electromagnetic looped network off-the-line, Fault Isolation, reactive power support.
The adjustment realizing direct voltage more rapidly to make flexible ring net controller, the invention provides a kind of based on communication between station, in the Active Power Controller of surely meritorious side current conversion station, introducing determines the middle controlled quentity controlled variable of DC voltage side current conversion station generation as additional signal, realize controlling the quick adjustment of direct voltage, its flow chart as shown in Figure 3, specifically comprises the following steps:
Step (1): the DC voltage control module of constant DC voltage control side receives higher level's direct voltage command value, by DC voltage regulation link, according to system running state, generates direct voltage reference value U dcref; The DC voltage control module of determining DC voltage side current conversion station receives higher level's direct voltage dispatch command Udcset, generates the reference signal Udcref of direct voltage through DC voltage regulation link; Design different DC voltage regulation links and upper lower limit value as required.Determine DC voltage side current conversion station and generate direct voltage reference value U dcreflogic diagram as shown in Figure 4.
Step (2): the U in step (1) dcrefactive current reference value idref_opp is generated after DC voltage controller PI link; The converter of constant DC voltage control pattern is adopted to be used for balanced d. c system active power and to keep DC-side Voltage Stabilization; When ignoring R and converter loss, the meritorious maintenance balance of converter alternating current-direct current both sides, namely
P = 3 2 · U s i s d = P d c = u d c i d c
During stable state:
i L = i d c = 3 2 · U s i s d u d c
Wherein: P is AC system active power, U s, i sdbe respectively alternating voltage and active current, P dc, u dc, i dcbe respectively direct voltage, direct current and direct current active power, i lfor direct current during stable state;
When VSC alternating current-direct current both sides meritorious uneven, will cause the fluctuation of direct voltage, now active current then will to DC bus capacitor charge or discharge, until DC voltage stability is in set point; For the converter of constant DC voltage control, be equivalent to an active balance node; In designed constant DC voltage control device, direct voltage and direct voltage instruction deviation after PI regulates as the reference value of active current direct voltage and direct voltage instruction deviation after PI regulates as the reference value of active current logic diagram as shown in Figure 5.
Step (3): utilize communication between station, by the id of step (2) ref_opppassed by communication optical fiber and be transferred to offside current conversion station from determining DC voltage side current conversion station, namely determine active power side current conversion station;
Step (4): the Active Power Controller of determining active power controller side current conversion station accepts active power dispatch instruction P set, the reference signal P of active power is generated through meritorious instruction governing loop ref; Active power dispatch instruction instruction Pset and for power oscillation damping with realize emergency DC power support object modulation marker signal Pm, generate the reference signal Pref of active power through meritorious instruction governing loop (ActivePowerReferenceRegulation), different meritorious instruction governing loops and upper lower limit value can be designed as required.Generate the logic diagram of the reference signal Pref of active power as shown in Figure 6.
Step (5): determine active power side current conversion station and receive id ref_opp, send it in Active Power Controller, as additional control signals; The Active Power Controller logic diagram of DC voltage side additional signal idref_opp is determined as shown in Figure 1 based on communication introducing.
Step (6): the reference signal P of the active power in step (4) refactive current reference value is generated, with the additional control signals id in step (5) through Active Power Controller ref_oppbe added, then through amplitude limit link and transform part, generate the positive sequence d axle active current reference value i determining active power side current conversion station d*;
Under three-phase power grid voltage equilibrium condition, the direction of power taking net voltage vector Us is d direction of principal axis, and design outer shroud Active Power Controller, generates active current reference value i sd *_ opp,
P = 3 2 · U s i s d
Wherein: P is AC system active power, U s, i sdbe respectively alternating voltage and active current.
Direct voltage quick adjustment control imitation result figure as shown in Figure 2, wherein: (a) direct voltage command value; (b) direct voltage quick adjustment control effects.Generate active current reference value i sd *the logic diagram of _ opp as shown in Figure 7.
The present invention also provides a kind of control system of DC voltage control method of flexible ring net controller, comprises and carries out determining active power side current conversion station and determining DC voltage side current conversion station of communication successively;
Determine active power controller side current conversion station and comprise the active power controller module and outer shroud Active Power Controller module of carrying out communication successively; Active power controller module is for receiving higher level's active power command value P set, active power reference value generation module is for generating active power reference value P ref; Outer shroud Active Power Controller module is according to active power reference value P refgenerate active current reference value i sd * _ opp; Determine DC voltage side current conversion station and comprise DC voltage control module; Described DC voltage control module is for receiving higher level's direct voltage dispatch command U dcset; And generate the reference signal U of direct voltage dcref.
The present invention is by communication between station, the middle controlled quentity controlled variable that the DC voltage controller determining DC voltage side current conversion station produces is transmitted given power side current conversion station, additional control signals as Active Power Controller is introduced, and then when direct voltage command value changes, offside current conversion station also can regulate active power to match with the change of direct voltage rapidly, realize cooperation control, make actual direct voltage Rapid Variable Design.
Above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; although with reference to above-described embodiment to invention has been detailed description; those of ordinary skill in the field still can modify to the specific embodiment of the present invention or equivalent replacement; these do not depart from any amendment of spirit and scope of the invention or equivalent replacement, are all applying within the claims of the present invention awaited the reply.

Claims (7)

1. a DC voltage control method for flexible ring net controller, is characterized in that, described method comprises the steps:
Step (1): constant DC voltage control side generates direct voltage reference value U dcref;
Step (2): direct voltage reference value U dcrefafter DC voltage controller PI link, generate active current reference value id ref_opp;
Step (3): by active current reference value id ref_oppbe transferred to by communication optical fiber and determine active power side current conversion station;
Step (4): determine the reference signal P that active power controller side current conversion station generates active power ref;
Step (5): determine active power side current conversion station and receive active current reference value id ref_opp, send it in Active Power Controller, as additional control signals;
Step (6): determine active power side current conversion station and generate positive sequence d axle active current reference value
2. DC voltage control method as claimed in claim 1, is characterized in that, in described step (1), the DC voltage control module of determining DC voltage side current conversion station receives higher level's direct voltage command value U dcset, by DC voltage regulation link, according to system running state, generate direct voltage reference value U dcref; Design different DC voltage regulation links and upper lower limit value as required.
3. DC voltage control method as claimed in claim 1, is characterized in that, in described step (2), adopts the converter of constant DC voltage control pattern be used for balanced d. c system active power and keep DC-side Voltage Stabilization; When ignoring R and converter loss, the meritorious maintenance balance of converter alternating current-direct current both sides, that is:
P = 3 2 · U s i s d = P d c = u d c i d c
During stable state:
i L = i d c = 3 2 · U s i s d u d c
Wherein: P is AC system active power, U s, i sdbe respectively alternating voltage and active current, P dc, u dc, i dcbe respectively direct voltage, direct current and direct current active power, i lfor direct current during stable state;
When VSC alternating current-direct current both sides meritorious uneven, will cause the fluctuation of direct voltage, now active current then will to DC bus capacitor charge or discharge, until DC voltage stability is in set point; For the converter of constant DC voltage control, be equivalent to an active balance node; In designed constant DC voltage control device, direct voltage and direct voltage instruction deviation after PI regulates as the reference value of active current
4. DC voltage control method as claimed in claim 1, is characterized in that, in described step (3), utilizes communication between station, by active current reference value id ref_opppassed by communication optical fiber and be transferred to offside current conversion station from determining DC voltage side current conversion station, namely determine active power side current conversion station.
5. DC voltage control method as claimed in claim 1, is characterized in that, in described step (4), the Active Power Controller of determining active power controller side current conversion station receives active power dispatch instruction P set, the reference signal P of active power is generated through meritorious instruction governing loop ref;
Active power dispatch instruction instruction Pset and for power oscillation damping with realize emergency DC power support object modulation marker signal Pm, generate the reference signal Pref of active power through meritorious instruction governing loop, different meritorious instruction governing loops and upper lower limit value can be designed as required.
6. DC voltage control method as claimed in claim 1, is characterized in that, in described step (6), and the reference signal P of active power refactive current reference value is generated, with additional control signals id through Active Power Controller ref_oppbe added, then through amplitude limit link and transform part, generate the positive sequence d axle active current reference value of determining active power side current conversion station
Under three-phase power grid voltage equilibrium condition, the direction of power taking net voltage vector Us is d direction of principal axis, and design outer shroud Active Power Controller, generates active current reference value i sd *_ opp,
P = 3 2 · U s i s d
Wherein: P is AC system active power, U s, i sdbe respectively alternating voltage and active current.
7. a control system for the DC voltage control method of the flexible ring net controller as described in any one of claim 1-6, is characterized in that, described control system comprises carries out determining active power side current conversion station and determining DC voltage side current conversion station of communication successively;
Describedly determine active power controller side current conversion station and comprise the active power controller module and outer shroud Active Power Controller module of carrying out communication successively; Active power controller module is for receiving higher level's active power command value P set, active power reference value generation module is for generating active power reference value P ref; Outer shroud Active Power Controller module is according to active power reference value P refgenerate active current reference value
Describedly determine DC voltage side current conversion station and comprise DC voltage control module; Described DC voltage control module is for receiving higher level's direct voltage dispatch command U dcset; And generate the reference signal U of direct voltage dcref.
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CN106058842A (en) * 2016-07-25 2016-10-26 国家电网公司 DC power grid voltage control method
CN106685222A (en) * 2017-01-06 2017-05-17 许继电气股份有限公司 DC/DC converter and equilibrium control method for direct-current bus voltage in DC/DC converter
CN107612013A (en) * 2017-09-13 2018-01-19 南京南瑞继保电气有限公司 A kind of direct current network voltage range control method
CN108039718A (en) * 2017-11-17 2018-05-15 中国电力科学研究院有限公司 A kind of improved flexible direct current voltage control method and system
CN109818376A (en) * 2017-11-20 2019-05-28 国网江苏省电力公司徐州供电公司 A kind of flexibility supplying power allocation system active power controller method
CN112018801A (en) * 2020-08-06 2020-12-01 江苏省电力试验研究院有限公司 Receiving-end cascade hybrid direct current coordination control method based on dynamic amplitude limiting
CN114629126A (en) * 2022-04-18 2022-06-14 广东电网有限责任公司电力调度控制中心 Control method and system for two-area system interconnected by alternating current and multi-loop direct current

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CN105932706B (en) * 2016-05-31 2018-07-06 中国南方电网有限责任公司超高压输电公司检修试验中心 A kind of control method for coordinating for improving mixing back-to-back DC system
CN105932706A (en) * 2016-05-31 2016-09-07 中国南方电网有限责任公司超高压输电公司检修试验中心 Coordinated control method for improving hybrid back-to-back DC system
CN106058842A (en) * 2016-07-25 2016-10-26 国家电网公司 DC power grid voltage control method
CN106685222A (en) * 2017-01-06 2017-05-17 许继电气股份有限公司 DC/DC converter and equilibrium control method for direct-current bus voltage in DC/DC converter
CN106685222B (en) * 2017-01-06 2019-06-21 许继电气股份有限公司 A kind of DC/DC converter and DC/DC converter internal direct current busbar voltage balance control method
CN107612013A (en) * 2017-09-13 2018-01-19 南京南瑞继保电气有限公司 A kind of direct current network voltage range control method
CN107612013B (en) * 2017-09-13 2020-07-28 南京南瑞继保电气有限公司 Direct-current power grid voltage range control method
CN108039718B (en) * 2017-11-17 2023-09-22 中国电力科学研究院有限公司 Improved flexible direct-current voltage control method and system
CN108039718A (en) * 2017-11-17 2018-05-15 中国电力科学研究院有限公司 A kind of improved flexible direct current voltage control method and system
CN109818376A (en) * 2017-11-20 2019-05-28 国网江苏省电力公司徐州供电公司 A kind of flexibility supplying power allocation system active power controller method
CN109818376B (en) * 2017-11-20 2022-07-22 国网江苏省电力公司徐州供电公司 Active power control method for power supply system of flexible distribution network
CN112018801A (en) * 2020-08-06 2020-12-01 江苏省电力试验研究院有限公司 Receiving-end cascade hybrid direct current coordination control method based on dynamic amplitude limiting
CN114629126A (en) * 2022-04-18 2022-06-14 广东电网有限责任公司电力调度控制中心 Control method and system for two-area system interconnected by alternating current and multi-loop direct current
CN114629126B (en) * 2022-04-18 2024-04-26 广东电网有限责任公司电力调度控制中心 Control method and system for two-area system through alternating current and multi-circuit direct current interconnection

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