CN110311415B - Transient stability margin evaluation method for renewable energy power generation base - Google Patents
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Abstract
The invention discloses a transient stability margin evaluation method suitable for a renewable energy power generation base in a low voltage ride through period, which comprises the steps of firstly obtaining the voltage of a fault point of a power gridAmplitude | UfTotal active current instruction injected into grid-connected point by renewable energy power generation baseAnd total reactive current commandThen, calculating a total current instruction I injected into a grid-connected point by the renewable energy power generation base*Angle of command currentAnd transmission line impedance angle thetaZ: based on the obtained | Uf|、I*、And thetaZCalculating a transient instability boundary Amax: and then calculating the transient stability margin of the renewable energy power generation base during the fault: namely, it isIf MTVA is more than or equal to 0, the stability is ensured; otherwise, the stability is lost. The transient state instability criterion can be used as a transient state instability criterion of the renewable energy power generation base under the power grid fault, and the transient state stability margin of the renewable energy power generation base can be quantitatively measured.
Description
Technical Field
The invention relates to a transient instability criterion and a transient stability margin quantitative evaluation method thereof under a power grid short-circuit fault for a double-fed induction wind power grid-connected system, an inverter type wind power grid-connected system (such as a permanent magnet direct-drive wind power system) and a photovoltaic power generation grid-connected system, and provides a transient instability criterion and a quantifiable transient stability margin index of a renewable energy power generation base in a low-voltage ride-through process.
Background
With the rapid development of renewable energy sources such as wind power, photovoltaic and the like, large-scale wind power plants and photovoltaic power stations are planned and built more and more. But the power electronization degree of the renewable energy power generation equipment is higher, the operation characteristics of the renewable energy power generation equipment are different from those of the traditional synchronous generator, and great complexity is brought to the stability analysis of a renewable energy power generation base. Particularly, when a short-circuit fault occurs in a power grid, the transient instability criterion and the transient stability margin evaluation method of the traditional power system are difficult to be applied to the renewable energy power generation base. Therefore, it is necessary to provide a transient instability criterion and a transient stability margin quantitative evaluation method suitable for a renewable energy power generation base. Relevant studies have been carried out by scholars at home and abroad, such as the following published documents:
[1]Jiabing Hu,Bo Wang,Weisheng Wang,Haiyan Tang,Yongning Chi,and Qi Hu.Small Signal Dynamics of DFIG-Based Wind Turbines During Riding Through Symmetrical Faults in WeakAC Grid[J].IEEE Transactions on Energy Conversion,2017,32(2):720-730.
[2]Bo Wen,Dong Dong,Dushan Boroyevich,Rolando Burgos,Paolo Mattavelli,and Zhiyu Shen.Impedance-based analysis of grid-synchronization stability for three-phase paralleled converters[J].IEEE Transactions on Power Electronics,2016,31(1):26-38.
the method comprises the following steps that a complex torque coefficient method is utilized to analyze the influence of phase-locked loops and current loop control parameters of a double-fed grid-connected system on the small signal stability of the double-fed wind power generation system under the condition of a weak grid serious fault. The document [2] evaluates the influence of the dynamic performance of the phase-locked loop on the dynamic stability of the grid-connected inverter system by using an impedance modeling method. None of the above documents addresses the small signal stability of renewable energy power plants and does not relate to the analysis and evaluation of the transient stability of the system. In fact, when a serious short-circuit fault occurs in the power grid, the interaction between the output power flow of the renewable energy power generation base and the line impedance may cause the system to have no balance point, so that the renewable energy power generation base is subjected to transient instability, and then collapse and off-grid.
Disclosure of Invention
In view of the above-mentioned deficiencies in the prior art, the present invention provides a transient stability margin evaluation method for a renewable energy power generation base during a low voltage ride through period, which can determine whether a system is transient unstable according to a grid voltage drop degree, an active and reactive current instruction of the renewable energy power generation base, and a transmission line impedance, and calculate a transient stability margin value of the system, so as to provide a basis for quantitative evaluation of transient stability of the renewable energy power generation base.
The technical scheme of the invention is realized as follows:
a transient stability margin evaluation method suitable for a renewable energy power generation base in a low voltage ride through period is used for judging the transient stability of a double-fed induction wind power grid-connected system, an inverter type wind power grid-connected system and a photovoltaic power generation grid-connected system under the condition of a power grid short circuit fault and quantitatively evaluating the transient stability margin of the double-fed induction wind power grid-connected system, the inverter type wind power grid-connected system and the photovoltaic power generation grid-; the method is characterized in that: the specific evaluation steps are as follows;
A1) the renewable energy power generation base during the fault period adopts a grid voltage d-axis orientation mode to acquire the voltage amplitude value | U of the grid fault pointfThe total active current instruction injected into the grid-connected point by the renewable energy power generation base isAnd a total reactive current command of
A2) Subjecting the product obtained in step A1)Andcalculating a total current instruction I injected into a grid-connected point by the renewable energy power generation base according to the following formula*Command current angle thetaI*And transmission line impedance angle thetaZ:
Wherein, X and R are equivalent inductive reactance and resistance of a transmission line from a grid-connected point to a fault point respectively;
A3) subjecting the | U obtained in the step A1)fI obtained in step A2)*、θI*And thetaZThe transient instability boundary A is calculated as followsmax:
Wherein, Z is the impedance of the transmission line from the point-to-fault, and Z is R + jX;
A4) subjecting A obtained in step A3)maxAnd quantitatively calculating the transient stability margin of the renewable energy power generation base during the fault according to the following formula:
the MTVA value is an evaluation value of transient stability margin of the renewable energy power generation base during a fault period, and the larger the MTVA value is, the larger the transient stability margin of the system is, and the smaller the instability risk is;
A5) the method is used as a criterion for transient instability of the renewable energy power generation base during a fault according to the following formula:
compared with the prior art, the invention has the following beneficial effects:
the method can judge whether the system has transient instability or not according to the voltage drop degree of the power grid, the active and reactive current instruction of the renewable energy power generation base and the impedance of the power transmission line, and calculate the transient stability margin value of the system, can be used for transient instability criterion of a double-fed induction wind power grid-connected system, an inverter type wind power grid-connected system (such as a permanent magnet direct-drive wind power system) and a photovoltaic power generation grid-connected system under the short-circuit fault of the power grid, and quantitatively evaluate the transient stability margin thereof, and provides guiding suggestions for the development, planning, construction and scheduling instructions of the power grid of renewable energy.
Drawings
Fig. 1 is a schematic structural diagram of a doubly-fed induction wind farm access power system.
Fig. 2 is a simulation waveform diagram of the doubly-fed wind power base when the grid voltage drops to 20% and the MTVA is-0.2 °.
Fig. 3 is a simulation waveform diagram of the doubly-fed wind power base when the grid voltage drops to 20% and the MTVA is 28.2 °.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Taking a doubly-fed wind farm as an example, fig. 1 is a schematic structural diagram of a 200MVA doubly-fed wind power system accessing to a power system.
The invention discloses a transient stability margin evaluation method suitable for a renewable energy power generation base in a low-voltage ride through period, which is used for judging the transient stability of a double-fed induction wind power grid-connected system, an inverter type wind power grid-connected system and a photovoltaic power generation grid-connected system under the condition of a power grid short-circuit fault and quantitatively evaluating the transient stability margin of the double-fed induction wind power grid-connected system, the inverter type wind power grid-connected system and the. The evaluation method comprehensively considers the transient voltage stability and the transient power angle stability, and comprises the following specific evaluation steps;
A1) the renewable energy power generation base during the fault period adopts a grid voltage d-axis orientation mode to acquire the voltage amplitude value | U of the grid fault pointfThe total active current instruction injected into a point of connection (PCC) by a renewable energy power generation base isAnd a total reactive current command of
A2) Subjecting the product obtained in step A1)Andcalculating renewable energy according to the following formulaTotal current instruction I injected into PCC (point of common coupling) by an electric base*Angle of command currentAnd transmission line impedance angle thetaZ:
Wherein, X and R are equivalent inductive reactance and resistance from the PCC to the transmission line of the fault point respectively;
A3) subjecting the | U obtained in the step A1)fAnd I obtained in step A2)*、And thetaZThe transient instability boundary A is calculated as followsmax:
Wherein, Z is the impedance of the transmission line from the point-to-fault, and Z is R + jX;
A4) subjecting A obtained in step A3)maxAnd quantitatively calculating the transient stability margin of the renewable energy power generation base during the fault according to the following formula:
the MTVA value is an evaluation value of transient stability margin of the renewable energy power generation base during a fault period, and the larger the MTVA value is, the larger the transient stability margin of the system is, and the smaller the instability risk is;
A5) the method is used as a criterion for transient instability of the renewable energy power generation base during a fault according to the following formula:
description of the effects of the invention:
fig. 2 and fig. 3 respectively show simulated waveform comparison diagrams of the doubly-fed wind power base when the grid voltage drops to 20%, the MTVA is-0.2 ° and the MTVA is 28.2 °. In the figure, a three-phase short circuit fault occurs in a 0.4s power grid, and 0.5 s-1.1 s are fault duration stages, and as can be seen from figure 2, when the MTVA is less than 0, transient instability occurs in a double-fed wind power base, and the safe and stable operation capability of the power grid is seriously threatened. As can be seen from FIG. 3, when the MTVA is greater than 0, the system is in a transient stable operation region and has a transient stable margin of 28.2 degrees, and the doubly-fed wind power base can realize safe and stable operation during low voltage ride through.
In conclusion, the transient stability margin evaluation method applicable to the renewable energy power generation base in the low voltage ride through period can be used as a transient instability criterion of the renewable energy power generation base under the grid fault, and can quantitatively measure the transient stability margin.
Finally, it should be noted that the above-mentioned examples of the present invention are only examples for illustrating the present invention, and are not intended to limit the embodiments of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, it will be apparent to those skilled in the art that other variations and modifications can be made based on the above description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (1)
1. A transient stability margin evaluation method suitable for a renewable energy power generation base in a low voltage ride through period is used for judging the transient stability of a double-fed induction wind power grid-connected system, an inverter type wind power grid-connected system and a photovoltaic power generation grid-connected system under the condition of a power grid short circuit fault and quantitatively evaluating the transient stability margin of the double-fed induction wind power grid-connected system, the inverter type wind power grid-connected system and the photovoltaic power generation grid-; the method is characterized in that: the specific evaluation steps are as follows;
A1) the renewable energy power generation base during the fault period adopts a grid voltage d-axis orientation mode to acquire the voltage amplitude value | U of the grid fault pointfThe total active current instruction injected into the grid-connected point by the renewable energy power generation base isAnd a total reactive current command of
A2) Subjecting the product obtained in step A1)Andcalculating a total current instruction I injected into a grid-connected point by the renewable energy power generation base according to the following formula*Angle of command currentAnd transmission line impedance angle thetaZ:
Wherein, X and R are equivalent inductive reactance and resistance of a transmission line from a grid-connected point to a fault point respectively;
A3) subjecting the | U obtained in the step A1)fI obtained in step A2)*、And thetaZThe transient instability boundary A is calculated as followsmax:
Wherein, Z is the impedance of the transmission line from the point-to-fault, and Z is R + jX;
A4) will step A3)Obtained AmaxAnd quantitatively calculating the transient stability margin of the renewable energy power generation base during the fault according to the following formula:
the MTVA value is an evaluation value of transient stability margin of the renewable energy power generation base during a fault period, and the larger the MTVA value is, the larger the transient stability margin of the system is, and the smaller the instability risk is;
A5) the method is used as a criterion for transient instability of the renewable energy power generation base during a fault according to the following formula:
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