CN109149598B - Subsynchronous oscillation suppression method and system based on power grid near-end phase locking - Google Patents
Subsynchronous oscillation suppression method and system based on power grid near-end phase locking Download PDFInfo
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Abstract
The invention discloses a subsynchronous oscillation suppression method based on power grid near-end phase locking. The invention also discloses a subsynchronous oscillation suppression system based on the power grid near-end phase locking. The invention can weaken subsynchronous components in the phase angle output by the phase-locked loop, weaken subsynchronous oscillation generated by coupling the phase-locked loop with each link of vector control, and simultaneously do not need to increase extra cost.
Description
Technical Field
The invention relates to a sub-synchronous oscillation suppression method and system based on power grid near-end phase locking, and belongs to the field of new energy power generation.
Background
In recent years, new energy power generation in China is continuously and rapidly increased, and the proportion of the new energy power generation in a power grid is increasingly increased. Wind power in China is mainly concentrated in northwest, northeast and north China, and is currently the second largest power supply in the three-north area. With the increase of the wind power ratio, the strength of a wind power access system is relatively weakened, the coupling degree of control links such as a wind power set phase-locked loop and a current loop is deepened, and the problem of system oscillation involving wind power is easily caused. In recent years, a plurality of wind power centralized access areas have a sub-synchronous oscillation phenomenon of a regional power grid in which wind power generation sets participate, so that large-area wind power generation sets are disconnected. Subsynchronous oscillation occurs in a large direct-drive wind field in a certain area of Xinjiang in 7 months in 2015, so that torsional oscillation protection action close to a steam turbine unit is caused, and cutter failure is caused.
In order to avoid that the subsynchronous oscillation threatens the safety of the power grid, necessary measures need to be taken to inhibit the subsynchronous oscillation from occurring. The current suppression measures proposed by scholars can be divided into a grid-level suppression method and a wind turbine generator set-level suppression method. Grid level suppression measures such as the installation of FACTS devices near the wind farm are expensive in terms of added equipment. The method for restraining the fan side generally adds a damping control channel in the fan grid-connected control, can play a certain role, but cannot fundamentally weaken the coupling between each link of a phase-locked loop and vector control when a fan cluster is merged into a power grid, and has poor adaptability to a weak power grid.
Disclosure of Invention
The invention provides a sub-synchronous oscillation suppression method and a sub-synchronous oscillation suppression system based on power grid near-end phase locking, and solves the problem that the power grid adaptability of the existing suppression method is not high.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the subsynchronous oscillation suppression method based on the grid proximal phase locking changes a phase-locked loop control structure in the original grid-connected vector control, takes the calculated grid proximal phase angle as a reference phase angle of grid-connected vector control coordinate transformation, weakens subsynchronous components in the phase-locked loop output phase angle, and weakens subsynchronous oscillation generated by coupling of the phase-locked loop and each link of grid-connected vector control.
The process of calculating the phase angle of the near end of the power grid,
grid-connected vector control adopts grid voltage d-axis orientation, and the input of the phase-locked loop is q-axis component U of grid near-end voltagesq，UsqAnd obtaining the near-end phase angle of the power grid through filtering, PI regulation and integration in sequence.
UsqThe formula for calculating (a) is as follows,
Usq＝Ugq-ω(Lt+NLtw+NLs)Igd1
wherein, UgqIs the q-axis component of the fan grid-connected point voltage, omega is the subsynchronous oscillation angular frequency, N is the number of fans, Igd1D-axis component, L, of the grid-connected current of a single fantFor the leakage inductance of the fan box, LtwFor wind field to increase voltage and change leakage inductance, LsIs the equivalent inductance of the power grid.
UgqThe calculation process of (a) is that,
to fan grid point voltage UgCLARK conversion is carried out to obtain UgαβUsing the phase angle pair U of the power grid near end output by the last control period of the phase-locked loopgαβPerforming PARK conversion to obtain Ugq；UgαβThe voltage of the fan grid-connected point after CLARK conversion.
Igd1The calculation process of (a) is that,
to the network access current I of a single fang1CLARK transformation is carried out to obtain Igαβ1Using the phase angle pair I of the power grid output by the last control cycle of the phase-locked loopgαβ1Performing PARK conversion to obtain d-axis original component I of network access current of single fangd1′，Igd1' Filtering I by a DC blocking filterg1Mapping of fundamental component on d-axis to obtain Igd1；Igαβ1And the current is the network access current of the single fan after CLARK conversion.
By passing the current I of the fan into the networkg1Performing FFT operation to obtain omega; calculating L according to the short circuit capacity of the fan grid-connected points(ii) a Calculating to obtain L according to variable parameters of the fan boxt(ii) a Calculating to obtain L according to the wind field boosting variable parameterstw。
The wind turbine generator subsynchronous oscillation suppression system based on the power grid near-end phase locking comprises a power grid near-end phase locking module,
the power grid near-end phase locking module: in the original grid-connected vector control, a phase-locked loop control structure is changed, the calculated power grid near-end phase angle is used as a reference phase angle for grid-connected vector control coordinate transformation, subsynchronous components in the phase-locked loop output phase angle are weakened, and subsynchronous oscillation generated by coupling of the phase-locked loop and each link of grid-connected vector control is weakened.
The power grid near-end phase locking module comprises a power grid near-end phase angle calculation model;
and (3) calculating the near-end phase angle of the power grid: grid-connected vector control adopts grid voltage d-axis orientation, and the input of the phase-locked loop is q-axis component U of grid near-end voltagesq，UsqAnd obtaining the near-end phase angle of the power grid through filtering, PI regulation and integration in sequence.
The power grid near-end phase locking module also comprises a power grid near-end voltage q-axis component calculation module;
the grid near-end voltage q-axis component calculation module calculates a q-axis component of the grid near-end voltage according to the following formula,
Usq＝Ugq-ω(Lt+NLtw+NLs)Igd1
wherein, UgqIs the q-axis component of the fan grid-connected point voltage, omega is the subsynchronous oscillation angular frequency, N is the number of fans, Igd1D-axis component, L, of the grid-connected current of a single fantFor the leakage inductance of the fan box, LtwFor wind field to increase voltage and change leakage inductance, LsIs the equivalent inductance of the power grid.
The q-axis component calculation module of the power grid near-end voltage comprises a fan grid-connected point voltage q-axis component calculation module and a single fan grid-connected current d-axis component calculation module;
the fan grid-connected point voltage q-axis component calculation module: to fan grid point voltage UgCLARK conversion is carried out to obtain UgαβUsing the phase angle pair U of the power grid near end output by the last control period of the phase-locked loopgαβPerforming PARK conversion to obtain Ugq；UgαβThe voltage of a fan grid-connected point after CLARK conversion;
the single fan network access current d-axis component calculation module: to the network access current I of a single fang1CLARK transformation is carried out to obtain Igαβ1Using the phase angle pair I of the power grid output by the last control cycle of the phase-locked loopgαβ1Performing PARK conversion to obtain d-axis original component I of network access current of single fangd1′，Igd1' JingFiltering I by DC filterg1Mapping of fundamental component on d-axis to obtain Igd1；Igαβ1And the current is the network access current of the single fan after CLARK conversion.
The invention achieves the following beneficial effects: 1. according to the method, the control structure of the phase-locked loop is changed, the calculated power grid near-end phase angle is used as a reference phase angle for wind power grid-connected vector control coordinate transformation, subsynchronous components in the phase-locked loop output phase angle can be weakened, subsynchronous oscillation generated by coupling of the phase-locked loop and each link of vector control is weakened, and meanwhile, extra cost is not required to be increased; 2. the invention greatly weakens or even eliminates the subsynchronous component in the phase angle output by the phase-locked loop, weakens the subsynchronous oscillation generated by the coupling of the phase-locked loop and each link of vector control, and has better suppression effect; 3. the method is simple in engineering realization and widely applicable to application scenes of accessing the wind power scale to the alternating current power grid.
Drawings
FIG. 1 is an equivalent model diagram of a fan unit connected to an AC power grid;
FIG. 2 is a schematic diagram of a conventional phase-locked loop;
FIG. 3 is a schematic diagram of an improved phase locked loop of the present invention;
FIG. 4 is a waveform diagram showing the suppression effect of subsynchronous oscillation according to 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.
An equivalent model of a fan unit connected to an alternating current power grid is shown in an attached drawing 1, a voltage sampling point of the fan unit is a box transformer substation low-voltage side, a traditional phase-locked loop acquires a voltage phase angle of the box transformer substation low-voltage side, and a schematic diagram of the traditional phase-locked loop is shown in an attached drawing 2. With the increase of the number of grid-connected units and the equivalence of the system, for a single unit, the equivalent inductance of the power grid becomes larger and larger, so that the phase-locked loop is easily coupled with each link of vector control, thereby facilitating the generation and amplification of subsynchronous oscillation, and for this reason, the traditional phase-locked loop structure needs to be improved, specifically as follows:
the subsynchronous oscillation suppression method based on the power grid near-end phase locking comprises the following steps: in the original grid-connected vector control, a phase-locked loop control structure is changed, the calculated power grid near-end phase angle is used as a reference phase angle for grid-connected vector control coordinate transformation, subsynchronous components in the phase-locked loop output phase angle are greatly weakened, and subsynchronous oscillation generated by coupling of the phase-locked loop and each link of grid-connected vector control is weakened.
The positive direction of the defined current is the current flowing into the power grid, and for the equivalent model diagram shown in fig. 1, the vector relationship between the wind turbine grid-connected point and the near-end voltage of the power grid can be expressed by a formula as follows:
wherein, UgIs the voltage vector of the fan grid-connected point, omega is the subsynchronous oscillation angular frequency, LtFor the leakage inductance of the fan box, LtwFor wind field to increase voltage and change leakage inductance, LsIs equivalent inductance of the power grid, N is the number of wind field fans, IgIs the wind field network-entering current vector, UsAnd the vector is the near-end voltage vector of the power grid.
For a single fan set, the vector relationship between the fan grid-connected point and the grid near-end voltage can be expressed as follows:
Ug-ω(Lt+NLtw+NLs)Ig1＝Us (2)
wherein, Ig1The current vector of the single fan is connected to the network.
According to the formula 2, the near-end voltage of the power grid can be reversely deduced according to the grid-connected point voltage of the fan, the network access current, the number of fans, the subsynchronous oscillation angular frequency, the leakage inductance of the fan box transformer, the wind field voltage-boosting leakage inductance and the equivalent inductance of the power grid.
Equation 2 can be expressed on the dq axis in the synchronous rotating coordinate system as:
wherein, UgqQ for fan grid-connected point voltageAxial component, UgdIs d-axis component, U, of fan grid-connected point voltagesqIs q-axis component, U, of the near-end voltage of the networksdIs the d-axis component of the near-end voltage of the network, Igd1D-axis component of the grid-connected current of a single fan, Igq1Is the q-axis component of the network access current of a single fan.
According to the formula 3, the q-axis component U of the fan grid-connected point voltage is obtainedgqD-axis component I of network access current of single fangd1Q-axis component U of near-end voltage of power grid can be reversely deducedsq。
Based on the above analysis, the subsynchronous oscillation suppression method has the following specific principle:
the wind power integration vector control adopts grid voltage d-axis orientation, and in order to obtain the phase angle of the grid near-end voltage, a phase-locked loop needs to use a q-axis component U of the grid near-end voltagesqThe lock is zero; the specific schematic diagram is shown in FIG. 3, and the grid-connected point voltage U of the fan is measuredgCLARK conversion is carried out to obtain UgαβUsing the phase angle pair U of the power grid near end output by the last control period of the phase-locked loopgαβCarrying out PARK conversion to obtain q-axis component U of fan grid-connected point voltagegq(ii) a To the network access current I of a single fang1CLARK transformation is carried out to obtain Igαβ1Using the phase angle pair I of the power grid output by the last control cycle of the phase-locked loopgαβ1Performing PARK conversion to obtain d-axis original component I of network access current of single fangd1′，Igd1' Filtering I by a DC blocking filterg1Mapping the fundamental wave component on the d axis to obtain the d axis component I of the grid-connected current of the single fangd1As calculated by the following formula 4,
Usq＝Ugq-ω(Lt+NLtw+NLs)Igd1 (4)
obtaining q-axis component U of near-end voltage of power gridsqI.e. input of the phase-locked loop, UsqAnd obtaining the phase-locked loop output, namely the power grid near-end phase angle, through filtering, PI regulation and integration in sequence.
In formula 4, the fan is connected to the network through the current Ig1Performing FFT operation to obtain omega; calculating L according to the short circuit capacity of the fan grid-connected pointsThe short-circuit capacity of the fan grid-connected point is allowed to have a deviation of-40%; calculating to obtain L according to variable parameters of the fan boxt(ii) a Calculating to obtain L according to the wind field boosting variable parameterstw. When the scale of the fan is connected into an alternating current power grid to generate subsynchronous oscillation involving wind power control, the amplitude of the subsynchronous frequency band component is maximum at a fan access point and minimum at a system power supply point, and the meaning of the formula 4 is that U is used for controlling the frequency of the fangqSubtracting the voltage drop of the d-axis component of the sub-synchronous component of the network current on the equivalent inductor between the fan and the system power supply to obtain UsqThe subsynchronous component input by the phase-locked loop is greatly reduced, and the subsynchronous content of the phase angle output by the phase-locked loop is further reduced. Considering that the short-circuit capacity value of the grid-connected point of the fan generally has deviation, only considering that U issqThe method is close to a system power supply point, and sub-synchronous frequency band 'power grid near-end' phase locking, which is called power grid near-end phase locking for short, is realized.
According to the method, the sampled electrical quantity is used for calculating the phase angle of the near end of the power grid to replace the phase angle output by the original phase-locked loop, and the suppression effect on subsynchronous oscillation is excellent in the equivalent model that a plurality of fans are connected into the alternating current power grid. The simulation test waveform is shown in figure 4, under the working condition that the short circuit ratio is 1.8, the voltage phase angle of the grid-connected point of the traditional phase-locked loop fan is adopted before 2.75s, and the voltage phase angle of the near end of the improved phase-locked loop power grid is adopted after 2.75s, which shows that the scheme of the improved phase-locked loop provided by the invention has good inhibition effect on subsynchronous oscillation.
The method greatly weakens or even eliminates the subsynchronous component in the phase-locked loop output phase angle, weakens the subsynchronous oscillation generated by the phase-locked loop and each link of vector control, realizes the suppression of the subsynchronous oscillation, has better suppression effect, does not need to increase extra cost, has simple engineering realization, and is widely suitable for the application scene of accessing the wind power scale to the alternating current power grid.
Subsynchronous oscillation suppression system based on power grid near-end phase locking comprises a power grid near-end phase locking module and a power grid near-end phase locking module: in the original grid-connected vector control, a phase-locked loop control structure is changed, the calculated power grid near-end phase angle is used as a reference phase angle for grid-connected vector control coordinate transformation, subsynchronous components in the phase-locked loop output phase angle are weakened, and subsynchronous oscillation generated by coupling of the phase-locked loop and each link of grid-connected vector control is weakened.
The power grid near-end phase locking module comprises a power grid near-end phase angle calculation model; and (3) calculating the near-end phase angle of the power grid: grid-connected vector control adopts grid voltage d-axis orientation, and the input of the phase-locked loop is q-axis component U of grid near-end voltagesq，UsqAnd obtaining the near-end phase angle of the power grid through filtering, PI regulation and integration in sequence.
The power grid near-end phase locking module also comprises a power grid near-end voltage q-axis component calculation module; the grid near-end voltage q-axis component calculation module calculates a q-axis component of the grid near-end voltage according to the following formula,
Usq＝Ugq-ω(Lt+NLtw+NLs)Igd1
wherein, UgqIs the q-axis component of the fan grid-connected point voltage, omega is the subsynchronous oscillation angular frequency, N is the number of fans, Igd1D-axis component, L, of the grid-connected current of a single fantFor the leakage inductance of the fan box, LtwFor wind field to increase voltage and change leakage inductance, LsIs the equivalent inductance of the power grid.
The q-axis component calculation module of the power grid near-end voltage comprises a fan grid-connected point voltage q-axis component calculation module and a single fan grid-connected current d-axis component calculation module.
The fan grid-connected point voltage q-axis component calculation module: to fan grid point voltage UgCLARK conversion is carried out to obtain UgαβUsing the phase angle pair U of the power grid near end output by the last control period of the phase-locked loopgαβPerforming PARK conversion to obtain Ugq；UgαβThe voltage of a fan grid-connected point after CLARK conversion;
the single fan network access current d-axis component calculation module: to the network access current I of a single fang1CLARK transformation is carried out to obtain Igαβ1Using the phase angle pair I of the power grid output by the last control cycle of the phase-locked loopgαβ1Performing PARK conversion to obtain d-axis original component I of network access current of single fangd1′，Igd1' Filtering I by a DC blocking filterg1Mapping of fundamental component on d-axis to obtain Igd1；Igαβ1And the current is the network access current of the single fan after CLARK conversion.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a grid near-end phase-lock based subsynchronous oscillation suppression method.
A computing device comprising one or more processors, memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing a method of subsynchronous oscillation suppression based on grid near-end phase locking.
The subsynchronous oscillation suppression method based on the power grid near-end phase locking is not only suitable for wind power grid connection, but also suitable for photovoltaic grid connection, energy storage grid connection and the like, so that the computing equipment is a converter or a static reactive generator.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (6)
1. The subsynchronous oscillation suppression method based on the power grid near-end phase locking is characterized by comprising the following steps of: in the original grid-connected vector control, a phase-locked loop control structure is changed, the calculated power grid near-end phase angle is used as a reference phase angle for grid-connected vector control coordinate transformation, subsynchronous components in the phase-locked loop output phase angle are weakened, and subsynchronous oscillation generated by coupling of the phase-locked loop and each link of grid-connected vector control is weakened;
wherein, the near-end phase angle calculation process of the power grid,
grid-connected vector control adopts grid voltage d-axis orientation, and the input of the phase-locked loop is q-axis component U of grid near-end voltagesq，UsqObtaining a near-end phase angle of the power grid through filtering, PI regulation and integration in sequence;
Usqthe formula for calculating (a) is as follows,
Usq＝Ugq-ω(Lt+NLtw+NLs)Igd1
wherein, UgqIs the q-axis component of the fan grid-connected point voltage, omega is the subsynchronous oscillation angular frequency, N is the number of fans, Igd1D-axis component, L, of the grid-connected current of a single fantFor the leakage inductance of the fan box, LtwFor wind field to increase voltage and change leakage inductance, LsIs the equivalent inductance of the power grid.
2. The subsynchronous oscillation suppression method based on grid near-end phase locking according to claim 1, characterized in that: u shapegqThe calculation process of (a) is that,
to fan grid point voltage UgCLARK conversion is carried out to obtain UgαβUsing the phase angle pair U of the power grid near end output by the last control period of the phase-locked loopgαβPerforming PARK conversion to obtain Ugq；UgαβThe voltage of the fan grid-connected point after CLARK conversion.
3. The subsynchronous oscillation suppression method based on grid near-end phase locking according to claim 1, characterized in that: i isgd1The calculation process of (a) is that,
to the network access current I of a single fang1CLARK transformation is carried out to obtain Igαβ1Using the phase angle pair I of the power grid output by the last control cycle of the phase-locked loopgαβ1Performing PARK conversion to obtain d-axis original component I of network access current of single fangd1′，Igd1' Filtering I by a DC blocking filterg1Mapping of fundamental component on d-axis to obtain Igd1；Igαβ1And the current is the network access current of the single fan after CLARK conversion.
4. The subsynchronous oscillation suppression method based on grid near-end phase locking according to claim 1, characterized in that: by passing the current I of the fan into the networkg1Performing FFT operation to obtain omega; calculating L according to the short circuit capacity of the fan grid-connected points(ii) a Calculating to obtain L according to variable parameters of the fan boxt(ii) a Calculating to obtain L according to the wind field boosting variable parameterstw。
5. Subsynchronous oscillation suppression system based on power grid near-end phase locking is characterized in that: comprises a power grid near-end phase-locking module,
the power grid near-end phase locking module: in the original grid-connected vector control, a phase-locked loop control structure is changed, the calculated power grid near-end phase angle is used as a reference phase angle for grid-connected vector control coordinate transformation, subsynchronous components in the phase-locked loop output phase angle are weakened, and subsynchronous oscillation generated by coupling of the phase-locked loop and each link of grid-connected vector control is weakened;
the power grid near-end phase locking module comprises a power grid near-end phase angle calculation model;
and (3) calculating the near-end phase angle of the power grid: grid-connected vector control adopts grid voltage d-axis orientation, and the input of the phase-locked loop is q-axis component U of grid near-end voltagesq，UsqObtaining a near-end phase angle of the power grid through filtering, PI regulation and integration in sequence;
the power grid near-end phase locking module also comprises a power grid near-end voltage q-axis component calculation module;
the grid near-end voltage q-axis component calculation module calculates a q-axis component of the grid near-end voltage according to the following formula,
Usq＝Ugq-ω(Lt+NLtw+NLs)Igd1
wherein, UgqIs the q-axis component of the fan grid-connected point voltage, omega is the subsynchronous oscillation angular frequency, N is the number of fans, Igd1D-axis component, L, of the grid-connected current of a single fantFor the leakage inductance of the fan box, LtwFor wind field to increase voltage and change leakage inductance, LsIs the equivalent inductance of the power grid.
6. The grid near-end phase-locked based subsynchronous oscillation suppression system according to claim 5, wherein: the q-axis component calculation module of the power grid near-end voltage comprises a fan grid-connected point voltage q-axis component calculation module and a single fan grid-connected current d-axis component calculation module;
the fan grid-connected point voltage q-axis component calculation module: to fan grid point voltage UgTo carry outCLARK transformation to obtain UgαβUsing the phase angle pair U of the power grid near end output by the last control period of the phase-locked loopgαβPerforming PARK conversion to obtain Ugq；UgαβThe voltage of a fan grid-connected point after CLARK conversion;
the single fan network access current d-axis component calculation module: to the network access current I of a single fang1CLARK transformation is carried out to obtain Igαβ1Using the phase angle pair I of the power grid output by the last control cycle of the phase-locked loopgαβ1Performing PARK conversion to obtain d-axis original component I of network access current of single fangd1′，Igd1' Filtering I by a DC blocking filterg1Mapping of fundamental component on d-axis to obtain Igd1；Igαβ1And the current is the network access current of the single fan after CLARK conversion.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834448A (en) * | 2010-03-23 | 2010-09-15 | 浙江大学 | Method for restraining sub-synchronous oscillation of power system based on SSSC (Static Synchronous Series Compensator) |
| EP2662561A1 (en) * | 2012-05-09 | 2013-11-13 | Siemens Aktiengesellschaft | Method and arrangement for damping a shaft oscillation |
| CN105470979A (en) * | 2014-09-12 | 2016-04-06 | 国家电网公司 | Method and system for inhibiting double-fed wind turbine sub-synchronous oscillation |
| CN106786664A (en) * | 2016-12-12 | 2017-05-31 | 国电南瑞科技股份有限公司 | A kind of active sub-synchronous oscillation restraining device in Wind turbines side and its method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7508224B2 (en) * | 2006-04-07 | 2009-03-24 | Michael Lamar Williams | Method for measuring stability margin at a node of a polyphase power grid |
-
2018
- 2018-08-22 CN CN201810957502.1A patent/CN109149598B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834448A (en) * | 2010-03-23 | 2010-09-15 | 浙江大学 | Method for restraining sub-synchronous oscillation of power system based on SSSC (Static Synchronous Series Compensator) |
| EP2662561A1 (en) * | 2012-05-09 | 2013-11-13 | Siemens Aktiengesellschaft | Method and arrangement for damping a shaft oscillation |
| CN105470979A (en) * | 2014-09-12 | 2016-04-06 | 国家电网公司 | Method and system for inhibiting double-fed wind turbine sub-synchronous oscillation |
| CN106786664A (en) * | 2016-12-12 | 2017-05-31 | 国电南瑞科技股份有限公司 | A kind of active sub-synchronous oscillation restraining device in Wind turbines side and its method |
Non-Patent Citations (1)
| Title |
|---|
| 具有自主电网同步与弱网稳定运行能力的双馈风电机组控制方法;张琛;《中国电机工程学报》;20170120;全文 * |
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