CN205724922U - The grid side sub-synchronous oscillation restraining device that new forms of energy base goes out through string by-carriage - Google Patents
The grid side sub-synchronous oscillation restraining device that new forms of energy base goes out through string by-carriage Download PDFInfo
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Abstract
This utility model provides the grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base goes out through string by-carriage, including signal extraction module, signal processing module and voltage source converter；Signal extraction module, signal processing module and voltage source converter are sequentially connected with；The input of signal extraction module is connected to collecting station and going here and there between benefit transmitting system of generation of electricity by new energy base；The outfan of voltage source converter is connected with the described power transmission line of sending outside collecting station.Compared with prior art, the grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base that this utility model provides goes out through string by-carriage, can avoid large-scale new forms of energy wind power base after string by-carriage goes out system grid connection, the a large amount of blower fan off-grids caused due to sub-synchronous oscillation, thus ensure that the safety and stablization that new forms of energy electric power is sent are run.
Description
Technical Field
The utility model relates to a power electronics and power equipment technical field, concretely relates to electric wire netting side subsynchronous oscillation suppression device towards new forms of energy base through cluster compensated system.
Background
Based on the rapid development of new energy power generation, China has become the country with the largest wind power grid-connected capacity and the fastest photovoltaic development. However, because of the characteristic that wind/light resources and load centers are reversely distributed in China, the new energy power generation technology faces the challenge of how to realize large-capacity and long-distance transmission. At present, the large-capacity and long-distance transmission of electric energy is mainly realized by adopting a series capacitance compensation technology, but the subsynchronous oscillation of a power grid is easily caused when large-scale new energy power generation is connected into the power grid through series compensation. For example, in 2009, germany in the united states has a subsynchronous oscillation accident that the first new energy in the world is connected into a power grid through series compensation, which causes damage to the equipment of the power distribution unit; 2010 after the new energy of the home-based source region is connected to the power grid in series compensation, subsynchronous oscillation faults caused by dozens of wind generating sets and series compensation occur, so that abnormal operation of power grid equipment and disconnection of a large number of fans are caused, and the safe and stable operation of the power grid is seriously threatened.
SUMMERY OF THE UTILITY MODEL
The subsynchronous oscillation trouble that the new forms of energy arouses through the series compensation access electric wire netting among the prior art, the utility model provides a new forms of energy base is through the electric wire netting side subsynchronous oscillation suppression device that the series compensation sent out.
The technical scheme of the utility model is that:
the device comprises a signal extraction module, a signal processing module and a voltage source converter;
the signal extraction module, the signal processing module and the voltage source converter are sequentially connected;
the input end of the signal extraction module is connected between a collection station of the new energy power generation base and the series compensation output system;
the output end of the voltage source converter is connected with the outgoing power transmission line of the collection station.
The utility model discloses the preferred technical scheme who further provides does: the input end of the signal extraction module comprises two branches:
one branch circuit is connected to a power transmission line between the collection station and the series compensation output system, and the other branch circuit is connected to a bus between the collection station and the voltage source converter.
The utility model discloses the preferred technical scheme who further provides does: the signal extraction module comprises a signal acquisition unit and a signal extraction unit;
the signal acquisition unit acquires the voltage u of the power transmission line between the collection station and the series compensation output systemSAnd current iSAnd collecting the current i of the bus between said collection station and the voltage source converterL；
The signal extraction unit is used for extracting a current i according to the current SAnd current iLA subsynchronous current signal is determined.
The utility model discloses the preferred technical scheme who further provides does: the signal processing module comprises a compensation reference signal calculation unit and a pulse modulation unit;
the compensation reference signal calculation unit receives the output signal of the signal extraction unit and calculates the compensation reference signal of the collection station according to the output signal;
the pulse modulation unit generates a trigger pulse according to the compensation reference signal and sends the trigger pulse to the voltage source converter; and the voltage source converter is used for carrying out power exchange with the series compensation output system so as to inhibit subsynchronous oscillation.
The utility model discloses the preferred technical scheme who further provides does: the compensation reference signal calculation unit comprises a first PI controller, a second PI controller, a third PI controller and a signal conversion subunit;
the first PI controller, the second PI controller and one input end of the signal conversion subunit are sequentially connected, the third PI controller is connected with the other input end of the signal conversion subunit, and the output end of the signal conversion subunit is connected with the voltage source converter.
The utility model discloses the preferred technical scheme who further provides does:
The first PI controller is used for carrying out PI control on the direct current deviation signal;
the second PI controller is used for carrying out PI control on the deviation signal output by the first comparator; the positive input end of the first comparator receives the output signal of the first PI controller and the subsynchronous current i output by the signal extraction module respectivelyLd_subThe negative input end receives the current i output by the signal extraction moduleSd；
The third PI controller is used for carrying out PI control on the deviation signal output by the second comparator; the positive input end of the second comparator receives the subsynchronous current i output by the signal extraction module respectivelyLq_subAnd a reactive current setpoint iqrefThe negative input end receives the current i output by the signal extraction moduleSq；
Wherein the current iSdAnd current iSqFor supplying the current i of the transmission line between the collecting station and the seriesSCurrent in d-q coordinate system.
The utility model discloses the preferred technical scheme who further provides does: the signal transformation subunit comprises a third comparator, a fourth comparator and a coordinate transformation subunit;
the positive input ends of the third comparators respectively receive the voltage u output by the signal extraction moduleSdAnd current iSdThe negative input end receives an output signal of the second PI controller;
The positive input end of the fourth comparator receives the voltage u output by the signal extraction module respectivelySqAnd current iSqThe negative input end receives an output signal of the third PI controller;
the coordinate transformation subunit performs coordinate transformation on output signals of the third comparator and the fourth comparator to obtain a voltage u under abc coordinatesmaVoltage umbAnd voltage umc；
Wherein the current iSdAnd current iSqFor supplying the current i of the transmission line between the collecting station and the seriesSCurrent in d-q coordinate system; the voltage uSdAnd voltage uSqIs the voltage u of the transmission lineSVoltage in d-q coordinate system.
The utility model discloses the preferred technical scheme who further provides does:
the new energy power generation base comprises a wind power generation base and/or a photovoltaic power generation base;
the series compensation delivery system comprises a series compensation device which is arranged on an outgoing power transmission line of the collection station.
Compared with the closest prior art, the beneficial effects of the utility model are that:
the utility model provides a pair of electric wire netting side subsynchronous oscillation suppression device that new forms of energy base sent out through the cluster benefit can avoid large-scale new forms of energy wind-powered electricity generation base to send out the system through the cluster and be incorporated into the power networks the back, because a large amount of fans that subsynchronous oscillation leads to are off-line to guarantee the safety and the steady operation that new forms of energy electric power sent out.
Drawings
FIG. 1: the embodiment of the utility model provides an electric wire netting side subsynchronous oscillation suppression device schematic diagram that new forms of energy base sent out through the cluster is mended;
FIG. 2: in the embodiment of the utility model, the wind power generation base sends out a power grid side subsynchronous oscillation suppression schematic diagram for four days through series compensation;
FIG. 3: the embodiment of the utility model provides a signal extraction module principle sketch map;
FIG. 4: the embodiment of the utility model provides a signal processing module principle sketch map;
wherein, 101: a signal extraction module; 102: a signal processing module; 1021: a first PI controller; 1022: a second PI controller; 1023: a third PI controller; 1024: a first comparator; 1025: a third comparator; 1026: a second comparator; 1027: a fourth comparator; 1028: a coordinate transformation subunit; 103: a voltage source converter; 201: a wind power generation base; 202: a collection station; 203: and (5) a string feeding and discharging system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The following describes a power grid side subsynchronous oscillation suppression device for a new energy base sent out through series compensation according to embodiments of the present invention with reference to the accompanying drawings, respectively.
Fig. 1 is a schematic diagram of a power grid side subsynchronous oscillation suppression device of a new energy base sent out through a series compensation in an embodiment of the present invention, as shown in the figure, the subsynchronous oscillation suppression device in this embodiment includes a signal extraction module 101, a signal processing module 102, and a voltage source converter 103. Wherein,
the signal extraction module 101, the signal processing module 102 and the voltage source converter 103 are connected in sequence, the input end of the signal extraction module 101 is connected between a collection station and a series compensation sending-out system of the new energy power generation base, and the output end of the voltage source converter 103 is connected with an outgoing power transmission line of the collection station.
The signal extraction module 101 and the signal processing module 102 are specifically described below with reference to the drawings.
1. Signal extraction module 101
The input end of the signal extraction module 101 in this embodiment is connected between the collection station of the new energy power generation base and the series compensation output system, and is: the input end of the signal extraction module 101 includes two branches, one branch is connected to the power transmission line between the collection station and the series compensation output system, the other branch is connected to the bus between the collection station and the voltage source converter, and the voltage source converter is used for performing power exchange with the series compensation output system to suppress subsynchronous oscillation.
The signal extraction module 101 in this embodiment includes a signal acquisition unit and a signal extraction unit. Wherein,
(1) signal acquisition unit
A signal acquisition unit for acquiring the voltage u of the transmission line between the collection station and the series compensation output systemSAnd current iSAnd collecting the current i of the bus between the collection station and the voltage source converterL。
(2) Signal extraction unit
A signal extraction unit for extracting a signal according to the current iSAnd current iLA subsynchronous current signal is determined. The method specifically comprises the following steps:
current i to the bus between the collection station and the voltage source converter 103LCarrying out coordinate transformation to obtain a current i under a d-q coordinate systemLdAnd current iLq(ii) a Carrying out coordinate transformation on the voltage and the current of a power transmission line between the collection station and the series compensation output system to obtain the voltage and the current under a d-q coordinate system;
obtaining current i of power transmission line between collection station and series compensation output systemSPhase of (a)p；
Draw current iLdSub-synchronous current iLd_subAnd current iLqSub-synchronous current iLq_subAnd for subsynchronous current iLd_subAnd iLq_subAnd carrying out phase compensation.
Fig. 3 is the embodiment of the present invention is a schematic diagram of a signal extraction module, as shown in the figure, in this embodiment, a signal extraction unit is used to collect three-phase current i of a bus between a station and a voltage source converter 103La、iLbAnd i LcCoordinate transformation is carried out, the voltage and the current of the power transmission line between the collection station and the series compensation sending-out system are subjected to coordinate transformation to obtain the voltage and the current under a d-q coordinate system, and the current i of the power transmission line between the collection station and the series compensation sending-out system is obtained through a phase-locked loop PLL (phase-locked loop)SPhase of (a)pFinally according to the current i after coordinate transformationLdAnd current iLqExtracting a current iLdSub-synchronous current iLd_subAnd current iLqSub-synchronous current iLq_subAnd for subsynchronous current iLd_subAnd iLq_subAnd carrying out phase compensation.
2. Signal processing module 102
The signal processing module 102 in this embodiment includes a compensation reference signal calculation unit and a pulse modulation unit. Wherein,
(1) compensation reference signal calculation unit
And the compensation reference signal calculation unit receives the output signal of the signal extraction unit and calculates the compensation reference signal of the collection station according to the output signal. The compensation reference signal calculation unit includes a first PI controller 1021, a second PI controller 1022, a third PI controller 1023, and a signal transformation subunit;
the first PI controller 1021, the second PI controller 1022 and one input end of the signal conversion subunit are connected in sequence, the third PI controller 1023 is connected with the other input end of the signal conversion subunit 1028, and the output end of the signal conversion subunit 1028 is connected with the voltage source converter 103. Wherein,
The first PI controller 1021 performs PI control on the dc offset signal, which is a dc set value u as shown in fig. 4dcrefAnd the actual value u of the direct currentdcThe deviation of (2).
A second PI controller 1022 for PI-controlling the deviation signal output from the first comparator 1024; a positive input terminal of the first comparator 1024 receives the output signal of the first PI controller 1021 and the sub-synchronous current i output by the signal extraction module 102Ld_subThe negative input end receives the current i output by the signal extraction module 102Sd。
A third PI controller 1023 which PI-controls the deviation signal output by the second comparator 1026; the positive input terminals of the second comparator 1026 respectively receive the subsynchronous currents i output by the signal extraction module 102Ld_subAnd a reactive current setpoint iqrefThe negative input end receives the current i output by the signal extraction moduleSqI.e. the input signal of the second comparator 1026 is iLd_sub+iqref-iSq。
The signal transformation subunit includes a third comparator 1025, a fourth comparator 1027, and a coordinate transformation subunit 1028:
the positive input terminals of the third comparator 1025 respectively receive the voltage u output by the signal extraction module 102SdAnd current iSdAnd the negative input terminal receives the output signal p of the second PI controller 10222I.e. the input signal of the third comparator 1025 is u Sd+iSd-p2。
The positive input terminals of the fourth comparator 1027 respectively receive the voltage u output by the signal extraction module 102SqAnd current iSqAnd the negative input terminal receives the output signal p of the third PI controller 10233I.e. the input signal of the fourth comparator 1027 is uSq+iSq-p3。
A coordinate transformation subunit 1028 performing coordinate transformation on the output signals of the third comparator 1025 and the fourth comparator 1027 to obtain a resultVoltage u in abc coordinatemaVoltage umbAnd voltage umc；
Wherein, the current iSdAnd current iSqFor supplying the current i of the transmission line between the collecting station and the seriesSCurrent in d-q coordinate system; voltage uSdAnd voltage uSqIs the voltage u of the transmission lineSVoltage in d-q coordinate system.
(2) Pulse modulation unit
And the pulse modulation unit generates a trigger pulse according to the compensation reference signal and sends the trigger pulse to the voltage source converter 103.
FIG. 4 is a schematic diagram of an embodiment of the signal processing module of the present invention, as shown in the figure, the output voltage u of the compensation reference signal calculating unit of the present embodimentmaVoltage umbAnd voltage umcVoltage umaVoltage umbAnd voltage umcI.e. compensating the reference signal, the pulse modulation unit depends on the voltage umaVoltage umbAnd voltage umcA trigger pulse is generated.
The utility model discloses well new forms of energy electricity generation base includes wind power generation base and/or photovoltaic power generation base, and the system is sent out including the cluster benefit device to the cluster benefit, and it is installed on collecting the station send the transmission line outward. The operation of the subsynchronous oscillation suppression device provided by the present invention will be described below by taking a wind power generation base as an example. Fig. 2 is the grid side subsynchronous oscillation suppression schematic diagram of the wind power generation base in the embodiment of the present invention, which is sent out for four days through the series compensation, as shown in the figure, the wind power generation base in this embodiment includes a wind power generator set 201, which is connected with a collection station 202 and a series compensation sending-out system 203 in sequence. One input branch of the signal extraction module 101 is connected between the aggregation station 202 and the series compensation outgoing system 203, and the other input branch is connected between the aggregation station 202 and the voltage source converter 103. In this embodiment, the voltage source converter 103 may adopt an H-bridge cascade structure based on a full-control device, and after receiving the trigger pulse issued by the signal processing module 102, controls the full-control device to switch on and/or off, and injects a corresponding current into the system to perform power exchange with the system, thereby implementing suppression of sub-synchronous oscillation.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A power grid side subsynchronous oscillation suppression device for a new energy base sent out through series compensation is characterized by comprising a signal extraction module, a signal processing module and a voltage source converter;
the signal extraction module, the signal processing module and the voltage source converter are sequentially connected;
the input end of the signal extraction module is connected between a collection station of the new energy power generation base and the series compensation output system;
the output end of the voltage source converter is connected with the outgoing power transmission line of the collection station.
2. The device as claimed in claim 1, wherein the input terminal of the signal extraction module includes two branches:
one branch circuit is connected to a power transmission line between the collection station and the series compensation output system, and the other branch circuit is connected to a bus between the collection station and the voltage source converter.
3. The device for suppressing the grid-side subsynchronous oscillation of a new energy base after series compensation as claimed in claim 1, wherein the signal extraction module comprises a signal acquisition unit and a signal extraction unit;
the signal acquisition unit acquires the voltage u of the power transmission line between the collection station and the series compensation output system SAnd current iSAnd collecting the current i of the bus between said collection station and the voltage source converterL；
The signal extraction unit is used for extracting a current i according to the currentSAnd current iLA subsynchronous current signal is determined.
4. The device for suppressing the grid-side subsynchronous oscillation of a new energy base after series compensation as claimed in claim 1, wherein the signal processing module comprises a compensation reference signal calculating unit and a pulse modulation unit;
the compensation reference signal calculation unit receives the output signal of the signal extraction unit and calculates the compensation reference signal of the collection station according to the output signal;
the pulse modulation unit generates a trigger pulse according to the compensation reference signal and sends the trigger pulse to the voltage source converter; and the voltage source converter is used for carrying out power exchange with the series compensation output system so as to inhibit subsynchronous oscillation.
5. The device for suppressing the grid-side subsynchronous oscillation of a new energy base after series compensation as claimed in claim 4, wherein the compensation reference signal calculating unit comprises a first PI controller, a second PI controller, a third PI controller and a signal transforming subunit;
the first PI controller, the second PI controller and one input end of the signal conversion subunit are sequentially connected, the third PI controller is connected with the other input end of the signal conversion subunit, and the output end of the signal conversion subunit is connected with the voltage source converter.
6. The device for suppressing the grid-side subsynchronous oscillation of a new energy base after series compensation as claimed in claim 5,
the first PI controller is used for carrying out PI control on the direct current deviation signal;
the second PI controller is used for carrying out PI control on the deviation signal output by the first comparator; the positive input end of the first comparator receives the output signal of the first PI controller and the subsynchronous current i output by the signal extraction module respectivelyLd_subThe negative input end receives the current i output by the signal extraction moduleSd；
The third PI controller is used for carrying out PI control on the deviation signal output by the second comparator; the positive input end of the second comparator receives the subsynchronous current i output by the signal extraction module respectivelyLq_subAnd a reactive current setpoint iqrefThe negative input end receives the current i output by the signal extraction moduleSq；
Wherein the current iSdAnd current iSqFor supplying the current i of the transmission line between the collecting station and the seriesSCurrent in d-q coordinate system.
7. The device for suppressing the grid-side subsynchronous oscillation of a new energy base after series compensation as claimed in claim 5, wherein the signal conversion subunit comprises a third comparator, a fourth comparator and a coordinate conversion subunit;
The positive input ends of the third comparators respectively receive the voltage u output by the signal extraction moduleSdAnd current iSdThe negative input end receives an output signal of the second PI controller;
the positive input end of the fourth comparator receives the voltage u output by the signal extraction module respectivelySqAnd current iSqThe negative input end receives an output signal of the third PI controller;
the coordinate transformation subunit performs coordinate transformation on output signals of the third comparator and the fourth comparator to obtain a voltage u under abc coordinatesmaVoltage umbAnd voltage umc；
Wherein the current iSdAnd current iSqFor supplying the current i of the transmission line between the collecting station and the seriesSCurrent in d-q coordinate system; the voltage uSdAnd voltage uSqIs the voltage u of the transmission lineSVoltage in d-q coordinate system.
8. The device for suppressing the grid-side subsynchronous oscillation of a new energy base after series compensation as claimed in claim 1,
the new energy power generation base comprises a wind power generation base and/or a photovoltaic power generation base;
the series compensation delivery system comprises a series compensation device which is arranged on an outgoing power transmission line of the collection station.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130038A (en) * | 2016-06-24 | 2016-11-16 | 全球能源互联网研究院 | The grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base goes out through string by-carriage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130038A (en) * | 2016-06-24 | 2016-11-16 | 全球能源互联网研究院 | The grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base goes out through string by-carriage |
| CN106130038B (en) * | 2016-06-24 | 2024-02-02 | 全球能源互联网研究院 | Power grid side subsynchronous oscillation suppression device for new energy base fed through series compensation |
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