CN106936141B - Active power control method and control system of flexible ring network controller - Google Patents

Active power control method and control system of flexible ring network controller Download PDF

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CN106936141B
CN106936141B CN201511023217.5A CN201511023217A CN106936141B CN 106936141 B CN106936141 B CN 106936141B CN 201511023217 A CN201511023217 A CN 201511023217A CN 106936141 B CN106936141 B CN 106936141B
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active power
voltage
current
converter station
active
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CN106936141A (en
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杨杰
阳岳希
高凯
庞辉
***
李正文
周杨
许韦华
马巍巍
别晓玉
朱钰
王超
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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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H02J2003/365—Reducing harmonics or oscillations in HVDC
    • 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
    • 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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Abstract

The invention relates to an active power control method and a control system of a flexible ring network controller, comprising the following steps: determining an active current reference value of the converter station at the active power side
Figure DDA0000896838470000011
Determining an active current reference value of an active power side converter station
Figure DDA0000896838470000012
The signal is transmitted to an opposite converter station by a communication optical fiber, namely a fixed direct-current voltage side converter station; reference signal U for generating direct-current voltage by converter station at fixed direct-current voltage sidedcref(ii) a Receiving an active current reference value by a direct current voltage controller of a converter station on a fixed direct current voltage side by utilizing inter-station communication
Figure DDA0000896838470000013
By introducing additional signals
Figure DDA0000896838470000014
The outer-loop DC voltage controller generates a positive-sequence d-axis current reference value of the constant DC voltage side converter station
Figure DDA0000896838470000015
The technical scheme provided by the invention utilizes inter-station communication, introduces an active current reference value generated by a fixed active power converter station into a direct-current voltage controller of the converter station at a fixed direct-current voltage side as an additional signal, and realizes the quick adjustment of the active power transmitted by the flexible ring network controller through the coordination control of the converter stations at two ends.

Description

Active power control method and control system of flexible ring network controller
Technical Field
The invention relates to a control strategy of a flexible ring network controller, in particular to an active power control method and a control system of the flexible ring network controller.
Background
The flexible ring network controller is back-to-back flexible direct current, has a symmetrical control system structure and mainly comprises an inner ring current controller, an outer ring power controller, a phase-locked synchronization link, a trigger pulse generation link and the like. The common external ring controller has the following forms: constant direct current voltage control, constant active power control, constant reactive power control, constant alternating current voltage control and the like. The outer loop controller tracks the reference signal given by the system level controller. In order to maintain the active power balance of the system, the system must have one side converter station with constant dc voltage control and the other side converter station with constant active power control.
When active power transmitted by alternating current systems at two ends connected with the flexible ring network controller is required to be promoted or reduced within a short time, a higher-level active power instruction value Pset received by a converter station at a fixed power side is changed, and an original control strategy only depends on the converter station at the fixed active power side to complete regulation: on one hand, a certain time delay exists in the active power response change, and on the other hand, the direct-current voltage generates large fluctuation due to the active power change, so that when the flexible ring network controller needs to provide active power support, the control response time delay has certain disadvantages.
Disclosure of Invention
In order to solve the above-mentioned deficiencies in the prior art, an object of the present invention is to provide an active power control method for a flexible ring network controller and a control system thereof.
The purpose of the invention is realized by adopting the following technical scheme:
the invention provides an active power control method of a flexible ring network controller, which is improved in that the method comprises the following steps:
(1) generating active current reference value by fixed active power side converter station
Figure BDA0000896838450000011
；
(2) Determining an active power reference value of an active power side converter station
Figure BDA0000896838450000012
The signal is transmitted to an opposite converter station by a communication optical fiber, namely a fixed direct-current voltage side converter station;
(3) DC voltage generated by converter station at fixed DC voltage sideReference signal U ofdcref；
(4) DC voltage control module reception for a fixed DC voltage side converter station
Figure BDA0000896838450000013
A signal;
(5) generating positive sequence d-axis current reference value by fixed direct-current voltage side converter station
Figure BDA0000896838450000024
Further, in the step (1), the active power control module of the fixed active power control side converter station receives the upper-level active power command value PsetActive power command value PsetAnd modulating the active signal P for the purpose of suppressing low frequency oscillations and achieving emergency power supportmGenerating an active power reference value P according to the running state of the alternating current system through an active power regulation linkref_oppDesigning different active instruction adjusting links and upper and lower limit values according to requirements; the outer loop active power controller is based on the active power reference value Pref_oppGenerating an active power current reference value
Figure BDA0000896838450000026
；
Under the condition of three-phase power grid voltage balance, the direction of a power grid voltage vector Us is a d-axis direction, an outer-loop active power controller is designed, and an active current reference value is generated
Figure BDA0000896838450000027
；
Figure BDA0000896838450000021
Wherein: u shapes、isdP ac voltage, active current and active power.
Further, in the step (3), the dc voltage control module of the fixed dc voltage side converter station receives the upper-level dc voltage scheduling command UdcsetPassing through a DC voltageReference signal U for generating direct-current voltage by regulation linkdcref(ii) a Different direct current voltage regulation links and upper and lower limit values are designed according to requirements.
Further, in the step (4), the dc voltage controller of the fixed dc voltage side converter station receives an active current reference value of the fixed active power side converter station
Figure BDA0000896838450000028
As an additional control signal.
Further, in the step (5), the reference signal Udcref of the dc voltage passes through the signal generated by the outer-loop dc voltage controller and the additional control signal
Figure BDA0000896838450000029
Adding the two phases, and generating a positive sequence d-axis current reference value of the converter station at the fixed direct voltage side through a limiting link and a conversion link
Figure BDA0000896838450000025
Further, a current converter adopting a constant direct current voltage control mode is used for balancing the active power of the direct current system and keeping the voltage of the direct current side stable; when neglecting R and transverter loss, decide the active power of direct current voltage control mode transverter alternating current-direct current both sides and keep balance, promptly:
Figure BDA0000896838450000022
at steady state:
Figure BDA0000896838450000023
when active power on the AC side and the DC side of the VSC is unbalanced, the fluctuation of DC voltage is caused, and at the moment, the active current charges or discharges a capacitor on the DC side until the DC voltage is stabilized at a set value; for a converter controlled by constant direct current voltage, the converter is equivalent to an active balance node; in the designed constant DC voltage controller, DC voltage and DCThe voltage command deviation is used as the reference value of the active current after being regulated by PI
Figure BDA0000896838450000031
Wherein: u shapes、isd、Pdc、udc、idcAlternating voltage, active current, direct power, direct voltage and direct current, respectively.
The invention provides a control system of an active power control method of a flexible ring network controller, which is improved in that the control system comprises a fixed active power side converter station and a fixed direct current voltage side converter station which are communicated in sequence;
the converter station at the fixed active power control side comprises an active power control module and an outer ring active power controller module which are communicated in sequence; the active power control module is used for receiving a superior active power instruction value PsetThe active power reference value generation module is used for generating an active power reference value Pref(ii) a The outer loop active power controller module is based on the active power reference value PrefGenerating an active current reference value
Figure BDA0000896838450000032
；
The fixed direct-current voltage side converter station comprises a direct-current voltage control module; the direct-current voltage control module is used for receiving a superior direct-current voltage scheduling instruction Udcset(ii) a And generates a reference signal U of a direct current voltagedcref。
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
the invention provides a coordination control method for realizing rapid adjustment of transmission active power by introducing an intermediate control signal of a fixed active power side converter station into a direct-current voltage controller of the fixed direct-current voltage side converter station as an additional signal based on inter-station communication, which has the following remarkable effects:
1. according to the method, inter-station communication is utilized to enable the converter station at the fixed active power side to generate an additional signal of a direct-current voltage controller of the converter station at the fixed direct-current voltage control side according to an active power instruction value, and a simulation result shows that the method can shorten the active power adjusting time of the flexible ring network controller by about 30ms, so that the control response speed is obviously improved.
2. The method is different from a common control strategy in that the task of regulating and controlling the active power is borne by a single converter station, and the task of regulating and controlling the active power is borne by two converter stations together, so that the control flexibility is improved, the stable operation capability of a system is enhanced, and the economy and the safety are improved.
3. The method introduces a signal generated by the opposite active power instruction value into the direct current voltage controller, so that the control of the direct current voltage is more stable, the fluctuation of the direct current voltage in the active power change process can be effectively stabilized, and the fluctuation of the direct current voltage is controlled to be within +/-1% from +/-6% - +/-7%.
Drawings
Fig. 1 is a flowchart of an active power control method of a flexible ring network controller provided in the present invention;
FIG. 2 is a logic diagram of a controller for introducing an additional signal at a fixed active power side to a fixed DC voltage side based on inter-station communication provided by the invention;
fig. 3 is a simulation result diagram of active power control provided by the present invention, wherein: (a) the simulation result of the upper active power instruction value; (b) d, direct current simulation results; (c) d, a direct current voltage simulation result;
FIG. 4 is a logic diagram for generating an active power reference value provided by the present invention;
FIG. 5 is a logic diagram of a reference signal for generating a DC voltage provided by the present invention;
FIG. 6 is a logic diagram of an outer loop DC voltage controller provided by the present invention;
fig. 7 is a logic diagram of an outer loop active power controller provided by the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
The flexible ring network controller is formed by connecting two voltage source converters to an alternating current power grid transmission line in a back-to-back mode, and functions of electromagnetic ring network disconnection, fault isolation, reactive support and the like are achieved through independent control over active power and reactive power of an alternating current system.
In order to improve the speed of the flexible ring network controller for controlling the active power, the invention provides a fast active power control method based on inter-station communication, a flow chart of which is shown in fig. 1, and the method specifically comprises the following steps:
step (1): an active power control module of a converter station at a fixed active power control side receives a superior active power instruction value PsetActive power command value PsetAnd modulating the active signal P for the purpose of suppressing low frequency oscillations and achieving emergency power supportmGenerating an active power reference value P according to the running state of the alternating current system through an active power regulation linkrefAnd designing different active instruction adjusting links and upper and lower limit values according to requirements. A logic diagram of a controller for introducing an additional signal to a fixed direct-current voltage side based on inter-station communication fixed active power side is shown in fig. 2. The outer loop active power controller is based on the active power reference value PrefGenerating an active current reference value
Figure BDA0000896838450000042
. The logic diagram of the outer loop active power controller is shown in fig. 7. Getting grid voltage vector U under the condition of three-phase grid voltage balancesThe direction of the active current is the direction of a d axis, an outer ring active power controller is designed, and an active current reference value is generated
Figure BDA0000896838450000043
(ii) a The logic diagram for generating the active power reference value is shown in fig. 4:
Figure BDA0000896838450000041
wherein: u shapes、isdP ac voltage, active current and active power. The simulation result diagram of the active power control is shown in fig. 3, in which: (a) the simulation result of the upper active power instruction value; (b) d, direct current simulation results; (c) d, a direct current voltage simulation result;
step (2): determining the active power reference value in the step (1) by the active power side converter station
Figure BDA0000896838450000059
And the signal is transmitted to an opposite converter station, namely a fixed direct current voltage side converter station, by a communication optical fiber.
And (3): a direct-current voltage control module of a converter station at a fixed direct-current voltage side receives a direct-current voltage scheduling instruction UdcsetGenerating a reference signal U of a DC voltage through a DC voltage regulation linkdcref. A logic diagram of a reference signal for generating a dc voltage is shown in fig. 5.
And (4): the DC voltage controller of the constant DC voltage side converter station receives the DC voltage controller in the step (2)
Figure BDA0000896838450000055
As an additional control signal. The logic diagram of the outer loop dc voltage controller is shown in fig. 6.
And (5): u in step (3)dcrefThe control signal generated after the PI link of the active power controller and the additional control signal in the step (4)
Figure BDA0000896838450000056
Adding the two phases, and generating a positive sequence d-axis current reference value on the fixed DC voltage side through a limiting link and a converting link
Figure BDA0000896838450000051
A current converter adopting a constant direct-current voltage control mode is used for balancing the active power of a direct-current system and keeping the voltage of a direct-current side stable; when neglecting R and transverter loss, the active power of transverter alternating current-direct current both sides keeps balanced, promptly:
Figure BDA0000896838450000052
at steady state:
Figure BDA0000896838450000053
when active power on the AC side and the DC side of the VSC is unbalanced, the fluctuation of DC voltage is caused, and at the moment, the active current charges or discharges a capacitor on the DC side until the DC voltage is stabilized at a set value; for a converter controlled by constant direct current voltage, the converter is equivalent to an active balance node; in the designed constant DC voltage controller, the DC voltage and DC voltage command deviation are regulated by PI and then added with additional control signal
Figure BDA0000896838450000057
After addition, the reference value is used as the reference value of the active current
Figure BDA0000896838450000054
The invention also provides a control system of the active power control method of the flexible ring network controller, wherein the control system comprises a fixed active power side converter station and a fixed direct current voltage side converter station which are communicated in sequence;
the fixed active power control side converter station comprises an active power control module and an outer ring active power controller module which are communicated in sequence; active powerThe power control module is used for receiving an upper active power instruction value PsetThe generating module is used for generating an active power reference value Pref(ii) a The outer loop active power controller module is based on the active power reference value PrefGenerating an active current reference value
Figure BDA0000896838450000058
。
The fixed direct-current voltage side converter station comprises a direct-current voltage control module (a direct-current voltage regulation link (namely the reference module for generating direct-current voltage) which is communicated in sequence is a component of the direct-current voltage control module); the direct-current voltage control module is used for receiving a superior direct-current voltage scheduling instruction Udcset(ii) a And generates a reference signal U of a direct current voltagedcref；
The invention adopts a coordination control method of introducing an active current reference value generated by a fixed active power side converter station into a direct current voltage controller of the fixed direct current voltage side converter station as an additional signal based on inter-station communication, thereby realizing the rapid adjustment of the transmission active power, and the simulation result shows that the required adjustment time can be reduced by at least about 30 ms. On the other hand, in the process of the change of the transmission power, the fluctuation of the direct current voltage under the original control strategy is about +/-6% to +/-7%, and the fluctuation of the direct current voltage under the new control strategy cannot exceed +/-1%. The invention improves the stable operation capability of the flexible ring network controller system, reduces the requirements on equipment and improves the technical economy and safety.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.

Claims (7)

1. A method for active power control of a flexible ring network controller, the method comprising:
(1) generating active current reference value by fixed active power side converter station
Figure FDA0000896838440000011
(2) Determining an active power reference value of an active power side converter station
Figure FDA0000896838440000012
The communication optical fiber is transmitted to an opposite converter station, and the direct-current voltage side converter station is determined at the opposite converter station;
(3) reference signal U for generating direct-current voltage by converter station at fixed direct-current voltage sidedcref；
(4) DC voltage control module reception for a fixed DC voltage side converter station
Figure FDA0000896838440000013
A signal;
(5) generating positive sequence d-axis current reference value by fixed direct-current voltage side converter station
Figure FDA0000896838440000014
2. The active power control method according to claim 1, wherein in the step (1), the active power control module of the fixed active power control side converter station receives an upper-level active power command value PsetActive power command value PsetAnd modulating the active signal P for the purpose of suppressing low frequency oscillations and achieving emergency power supportmGenerating an active power reference value P according to the running state of the alternating current system through an active power regulation linkref_oppDesigning different active instruction adjusting links and upper and lower limit values according to requirements; the outer loop active power controller is based on the active power reference value Pref_oppGenerating an active power current reference value
Figure FDA0000896838440000015
Under the condition of three-phase power grid voltage balance, the direction of a power grid voltage vector Us is a d-axis direction, an outer-loop active power controller is designed, and an active current reference value is generated
Figure FDA0000896838440000016
Figure FDA0000896838440000017
Wherein: u shapes、isdP ac voltage, active current and active power.
3. The active power control method according to claim 1, wherein in the step (3), the dc voltage control module of the fixed dc voltage side converter station receives an upper-level dc voltage scheduling command UdcsetGenerating a reference signal U of a DC voltage through a DC voltage regulation linkdcref(ii) a Different direct current voltage regulation links and upper and lower limit values are designed according to requirements.
4. The active power control method according to claim 1, wherein in the step (4), the dc voltage controller of the fixed dc voltage side converter station receives the active current reference value of the fixed active power side converter station
Figure FDA0000896838440000018
As an additional control signal.
5. The active power control method according to claim 1, wherein in step (5), the reference signal Udcref of the DC voltage is a signal generated after passing through the outer-loop DC voltage controller and an additional control signal
Figure FDA0000896838440000019
Adding the two phases, and generating a positive sequence d-axis current reference value of the converter station at the fixed direct voltage side through a limiting link and a conversion link
Figure FDA00008968384400000110
6. The active power control method according to claim 5, wherein the inverter using the constant dc voltage control mode is used for balancing the dc system active power and keeping the dc side voltage stable; when neglecting R and transverter loss, decide the active power of direct current voltage control mode transverter alternating current-direct current both sides and keep balance, promptly:
Figure FDA00008968384400000111
at steady state:
Figure FDA0000896838440000021
when active power on the AC side and the DC side of the VSC is unbalanced, the fluctuation of DC voltage is caused, and at the moment, the active current charges or discharges a capacitor on the DC side until the DC voltage is stabilized at a set value; for a converter controlled by constant direct current voltage, the converter is equivalent to an active balance node; in the designed constant DC voltage controller, the DC voltage and the DC voltage command deviation are used as the reference value of the active current after being regulated by PI
Figure FDA0000896838440000022
Wherein: u shapes、isd、Pdc、udc、idcAlternating voltage, active current, direct power, direct voltage and direct current, iLIs a direct current in a steady state.
7. A control system of an active power control method of a flexible ring network controller according to any of claims 1-6, characterized in that the control system comprises a fixed active power side converter station and a fixed DC voltage side converter station which are communicated in sequence;
the converter station at the fixed active power control side comprises an active power control module and an outer ring active power controller module which are communicated in sequence; the active power control module is used for receiving a superior active power instruction value PsetThe active power reference value generation module is used for generating an active power reference value Pref(ii) a The outer loop active power controller module is based on the active power reference value PrefGenerating an active current reference value
Figure FDA0000896838440000023
The fixed direct-current voltage side converter station comprises a direct-current voltage control module; the direct-current voltage control module is used for receiving a superior direct-current voltage scheduling instruction Udcset(ii) a And generates a reference signal U of a direct current voltagedcref。
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