CN109001573B - Method for determining short-circuit capacity of collector bus of wind power plant - Google Patents
Method for determining short-circuit capacity of collector bus of wind power plant Download PDFInfo
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Abstract
The embodiment of the invention provides a method for determining short-circuit capacity of a collector bus of a wind power plant. The determination method comprises the following steps: acquiring a voltage value when the reactive power of a grid-connected bus test point is zero, at least two groups of reactive power values and voltage values corresponding to the reactive power values; obtaining the short-circuit capacity of the grid-connected bus according to the reactive power compensation relation of the wind power plant, the voltage value when the reactive power is zero, at least two groups of reactive power values and the voltage values corresponding to the two groups of reactive power values; and calculating the short-circuit capacity of the collector bus of the current collecting wire based on the short-circuit capacity of the grid-connected bus according to the primary system structure of the wind power plant. By the method for determining the short-circuit capacity of the collector bus of the wind power plant, the short-circuit capacity of the bus is accurately and dynamically tested, so that a basis is provided for judging the strength of an access system of the wind power plant, and a reference basis is provided for adjusting control parameters of a fan and a reactive power compensation device.
Description
The invention discloses a method, a device and a system for testing bus short-circuit capacity, and is a divisional application with the application number of CN 201610086362.6.
Technical Field
The invention relates to the technical field of wind power, in particular to a method for determining short-circuit capacity of a bus of a collecting wire of a wind power plant.
Background
In recent years, the wind power technology in China always keeps a rapid and large-scale development situation, and ten million kilowatt-level wind power bases are planned and constructed in northwest, inner Mongolia and other places. The construction of large-scale wind power bases and large-scale wind power plants has more requirements on the acceptance capability and the strength of a power grid. The operation short-circuit capacity is an important parameter for representing the operation characteristics of the power system, and the size of the short-circuit capacity reflects the closeness degree of the connection between the bus and the power system. Therefore, the estimation of the operation short-circuit capacity has important significance for evaluating the strength and the voltage stability level of the system.
Generally, the prior art adopts a static estimation method, a neural network prediction method, a large-load disturbance simulation real measurement method and a Thevenin theorem and a switched capacitor estimation method. However, the above four methods have the following disadvantages: firstly, for a static estimation method, the reference system impedance is issued only once a year and is static, while the actual system impedance is dynamic, and the estimation method has low accuracy; secondly, for the prediction method based on the neural network, the calculated amount is large, and the model training process is not easy to grasp; thirdly, real-time monitoring under a conventional running state is difficult to realize by using a large-load disturbance simulation actual measurement method; fourthly, the method of utilizing the Thevenin theorem and the switched capacitor estimation method belongs to theoretical operation and is not strong in practicability.
Disclosure of Invention
The embodiment of the invention aims to provide a method for determining the short-circuit capacity of the collector bus of the wind power plant, so as to accurately and dynamically test the short-circuit capacity of the bus, thereby providing a basis for judging the strength of an access system of the wind power plant and having strong practicability.
In order to achieve the above object, an embodiment of the present invention provides a method for determining a short-circuit capacity of a collector bus of a wind farm, where the method for determining the short-circuit capacity of the collector bus of the wind farm includes: acquiring a voltage value when the reactive power of a grid-connected bus test point is zero, at least two groups of reactive power values and voltage values corresponding to the reactive power values; obtaining the short-circuit capacity of the grid-connected bus according to the reactive power compensation relation of the wind power plant, the voltage value when the reactive power is zero, the at least two groups of reactive power values and the voltage values corresponding to the at least two groups of reactive power values; and calculating the short-circuit capacity of the collector bus of the current collecting wire based on the short-circuit capacity of the grid-connected bus according to the primary system structure of the wind power plant.
According to the method for determining the short-circuit capacity of the collecting wire bus of the wind power plant, provided by the embodiment of the invention, the short-circuit capacity of the grid-connected bus is accurately and dynamically tested by acquiring the voltage value when the reactive power of the grid-connected bus test point is zero, at least two groups of reactive power values and the voltage values corresponding to the two groups of reactive power values, and further according to the reactive power compensation relation of the wind power plant, the voltage value when the reactive power is zero, the at least two groups of reactive power values and the voltage values corresponding to the two groups of reactive power values, so that a basis is provided for judging the weakness of an access system of the wind power plant, a reference basis is provided for adjusting the control parameters of a.
Drawings
Fig. 1 is a schematic flow chart of a bus short-circuit capacity testing method according to a first embodiment of the present invention;
fig. 2 is a schematic view of an application scenario of a bus short-circuit capacity testing method according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of reactive power compensation according to a first embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a second principle of reactive power compensation according to a first embodiment of the present invention;
fig. 5 is a terminal lead diagram of a 220kV measurement and control loop in an application scenario of the bus short circuit capacity test method shown in fig. 2;
fig. 6 is a lead diagram of a terminal of a measurement and control loop on a low-voltage side of a main transformer in an application scenario of the bus short-circuit capacity testing method shown in fig. 2;
fig. 7 is a schematic wiring diagram of an electrical energy quality tester in an application scenario of the bus short circuit capacity test method shown in fig. 2;
fig. 8 is a simplified schematic diagram of a wind field primary system in an application scenario of the bus short circuit capacity testing method shown in fig. 2;
fig. 9 is a schematic structural diagram of a bus short-circuit capacity testing apparatus according to a second embodiment of the present invention.
Detailed Description
The method, the device and the system for testing the short-circuit capacity of the bus according to the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
The basic concept of the invention is to test the bus short-circuit capacity under the operation state of the wind power plant based on the reactive power compensation principle. Therefore, the method has reference significance for judging the strength of the wind power plant system and adjusting the control parameters of the fan and the reactive power compensation device, is convenient to reduce system disturbance in an active mode, regulates and controls system voltage, and meanwhile guarantees system stability. The method does not need large calculation amount and has strong practicability.
Example one
Fig. 1 is a schematic flow chart of a bus short-circuit capacity testing method according to a first embodiment of the present invention, which can be executed on a bus short-circuit capacity testing apparatus according to a second embodiment of the present invention, and as shown in fig. 1, in a wind farm operating state, the bus short-circuit capacity testing method includes:
step 101: and acquiring a voltage value when the reactive power of the test point on the bus is zero, at least two groups of reactive power values and voltage values corresponding to the reactive power values.
It should be noted that the bus bar may be specifically a grid-connected bus bar and/or a collector bus bar.
Here, the wind farm may comprise a reactive power compensation device, and according to an exemplary embodiment of the present invention, step 101 may comprise: the output capacity of the reactive power compensation device is adjusted to detect the voltage value when the reactive power of the test point on the bus is zero, and at least two groups of reactive power values and the voltage values corresponding to the reactive power values.
Specifically, the process of adjusting the output capacity of the reactive power compensation device may include: acquiring a preset voltage operation range and a static short circuit capacity of a test point; calculating the regulation range of the output capacity according to the voltage operation range and the static short circuit capacity; and adjusting the output capacity of the reactive power compensation device according to the calculated adjustment range of the output capacity and the preset adjustment step length.
The static short-circuit capacity refers to the short-circuit capacity calculated by the system impedance of each bus of the power grid of the level according to the annual operation mode and a plurality of assumed boundary conditions and according to the given system impedance.
In a specific implementation manner, fig. 2 is a schematic view of an application scenario of the bus short-circuit capacity testing method according to the embodiment of the present invention, and as shown in fig. 2, in a wind farm, a reactive power compensation device and a fan collection line are boosted by a main transformer of a transformer substation and then connected to an electric power system through a substation outlet line. In fig. 2, the 220kV bus is the grid-connected bus, and the 35kV bus is the collector bus. For example, the substation 220kV bus test point and the substation 35kV bus test point shown in fig. 2 may be taken as points to be tested. And adjusting the output capacity of the reactive power compensation device once, and recording the voltage value when the reactive power of the test point is zero, at least two groups of reactive power values and the voltage values corresponding to the reactive power values. Wherein the recording of the power data and the voltage data may be accomplished using an associated sensing device (e.g., an electrical energy quality tester).
Step 102: and obtaining the bus short-circuit capacity according to the reactive power compensation relation of the wind power plant, the voltage value when the reactive power is zero, at least two groups of reactive power values and the voltage values corresponding to the at least two groups of reactive power values.
According to an exemplary embodiment of the invention, step 102 may comprise: calculating a reactive power change value and a voltage change value according to the at least two groups of reactive power values and the voltage values thereof; and calculating the short-circuit capacity of the bus according to the reactive power compensation relation, the reactive power change value and the voltage change value of the wind power plant and the voltage value when the reactive power is zero.
Specifically, the above processing for calculating the bus short-circuit capacity according to the reactive power compensation relationship, the reactive power variation value and the voltage variation value of the wind farm, and the voltage value when the reactive power is zero may calculate the bus short-circuit capacity according to the following formula (1):
wherein S isSCFor short-circuit capacity of bus, U0The voltage value at the test point when the reactive power is zero, the delta Q is the reactive power change value at the test point, and the delta U is the voltage change value at the test point. Here, equation (1) may be regarded as an expression embodying a reactive power compensation relationship of the wind farm.
In order to facilitate a clearer and more accurate understanding of the embodiments of the present invention, the derivation of formula (1) is described in detail below.
Specifically, the bus short-circuit capacity shown in equation (1) is based on the principle of reactive power compensation. Fig. 3 is a schematic diagram of reactive power compensation according to a first embodiment of the present invention, and fig. 4 is a schematic diagram of reactive power compensation according to a second embodiment of the present invention. With reference to fig. 3 and 4, fig. 3 shows a single-phase equivalent circuit diagram of reactive power compensation, where U is the system voltage of the wind farm and R and X are the system resistance and reactance, respectively, of the wind farm. It can be assumed that the load variation is small, so that there is Δ U < < U, and assuming that R < < X, fig. 4 shows a characteristic curve reflecting the variation of the system voltage and the reactive power. As can be seen from fig. 4, as the reactive power Q supplied by the system increases, the system voltage U decreases, and the approximate characteristic curve of the system can be represented by the following equation (2) or equation (3):
wherein, U0Is the system voltage when the reactive power is zero, SSCThe short circuit capacity of the system is represented by delta U and the reactive power change value is represented by delta Q.
It follows that a change in reactive power causes a proportional change in the power system voltage. After the reactive power compensation device is put into operation, the reactive power supplied by the power system is the sum of the reactive power used by the load and the reactive power output by the reactive power compensation device, i.e. Q is QL+Qr. Therefore, when the load reactive power QLWhen changing, if the reactive power Q of the reactive power compensation devicerAlways make up for QLThe variation is such that Q remains constant and thus the supply voltage remains constant, which is the principle of dynamic compensation of reactive power. From the above formula (2) or formula (3), the following formula (4) is derived:
wherein, U0Is made withoutSystem voltage, S, when power is zeroSCFor the short circuit capacity of the system, Δ U is the voltage change value at the test point, and Δ Q is the reactive power change value.
It should be noted that, in combination with the bus short-circuit capacity testing method according to the embodiment of the present invention, the bus short-circuit capacity obtained by the foregoing formula (1) is numerically equal to the calculation result of the above expression (4) representing the characteristic curve of the reactive power compensation principle. Therefore, the short-circuit capacity S can be calculated by obtaining the delta Q and the delta U through field testSC。
The method for testing the short-circuit capacity of the bus according to the embodiment of the present invention will be described in detail with reference to fig. 2 and fig. 5 to 8.
Fig. 2 is a schematic view of an application scenario of a bus short-circuit capacity testing method according to an embodiment of the present invention, and fig. 2 shows a 220kV booster station in a wind farm, in which a 35kV bus is connected to 99 units through 6 current collecting lines, is boosted to a 220kV bus through a main transformer, and is then connected to a power system through a substation outgoing line, and a reactive power compensation device is configured as a set of Thyristor Controlled Reactor (TCR), and has a compensation reactive capacity of-30 Mvar to 0Mvar, and three sets of filter capacitor sets (FC), and has a compensation reactive capacity of 30 Mvar.
In practical application, the 220kV bus test point and the 35kV bus test point of the transformer substation shown in fig. 2 are used as points to be tested, and accordingly, a detection device (such as an electric energy quality tester) is hung on a secondary measurement and control loop of a wind power plant device, so that influences on a secondary protection loop and a metering loop are avoided.
Fig. 5 is a 220kV measurement and control loop terminal lead diagram in an application scenario of the bus short-circuit capacity test method shown in fig. 2, and voltage and current measurement and control loop terminal leads of a 220kV bus test point are shown in fig. 5, where a630, B630, C630, and N600 are voltage loop terminals, a4181, B4181, C4181, and N4181 are current loop terminals, and 1-13 on the other side are terminal row numbers. Fig. 6 is a diagram of a measurement and control loop terminal lead at the low-voltage side of the main transformer in an application scenario of the bus short-circuit capacity testing method shown in fig. 2, and referring to fig. 6, voltage and current measurement and control loop terminal leads at a 35kV bus test point are shown in fig. 6, wherein a640 ", B640", C640 ", N600 are voltage loop terminals, a4031, B4031, C4031, N4031 are current loop terminals, and 1-13 on the other side are terminal row numbers. Taking an electric energy quality tester as an example, fig. 7 is a schematic wiring diagram of the electric energy quality tester in an application scenario of the bus short-circuit capacity testing method shown in fig. 2, and a wiring method of the electric energy quality tester is shown in fig. 7. In the detection process, voltage test lines are clamped on the voltage loop terminal lead wires of the test points, voltage signals are led into the signal interfaces Ua, Ub, Uc and Un of the electric energy quality tester, and current clamps are hung on the current loop terminal lead wires of the test points, so that current signals are led into the signal interfaces Ia, Ib and Ic of the electric energy quality tester.
In general, in order to reduce the influence of active power fluctuation on the reactive power regulation output, the detection condition is determined in a wind power plant wind condition small and fan standby state, so that the voltage and the reactive power of the test point are detected by adjusting the output capacity of the reactive power compensation device. After the detection equipment is connected in the wiring mode, the specific process is as follows:
firstly, adjusting the control mode of the reactive power compensation device to be a local constant reactive power control mode, and recording data during initial detection, such as a reactive power value output by the reactive power compensation device, a voltage value of each bus and a reactive power value thereof;
secondly, in order to avoid voltage out-of-limit caused by too fast reactive power regulation, the output capacity of the reactive power compensation device is regulated by taking 2Mvar as a step length, and the voltage value and the reactive power value of a test point after each regulation operation are recorded.
It should be noted that, after the system needs to operate stably for 5min after each adjustment, the next adjustment can be performed. When the voltage value approaches the upper and lower limits, further adjustment is stopped. Meanwhile, due to the local constant reactive power control mode, the wind power plant has the risk of overvoltage and undervoltage, and therefore, in order to ensure the stable operation of the wind power plant, the wind power plant needs to be adjusted according to the voltage operation condition of the wind power plant. That is, the bus voltages need to be controlled within a predetermined operating range. Wherein the operation range of the 220kV bus is 225.84 kV-232.93 kV, and the operation range of the voltage of the 35kV bus is 36.81 kV-35.4 kV.
For example, according to the static short circuit capacity 750MVA of the 220kV bus and the 220kV voltage operation range 225.84 kV-232.93 kV, the adjustment range of the output capacity of the reactive power compensation device is calculated to be 8.94 Mvar-14.15 Mvar. Considering the condition that the bus short-circuit capacity is smaller than the scheduling calculation result when the wind power plant actually operates, the system has certain voltage operation margin, and the adjustment range of the output capacity is-10 Mvar to 8 Mvar. Then, the output capacity of the reactive power compensation device is adjusted within the adjusting range of-10 Mvar to 8Mvar and the adjusting step length of 2 Mvar.
After the adjustment and recording process is finished, the output of the reactive power compensation device is still adjusted by taking 2Mvar as a step length to restore to the value during initial detection, and the Control mode is adjusted from the local constant reactive power Control mode to an Automatic Voltage Control (AVC) mode, so that the detection process is finished.
And finally, calculating according to the detected data. Specifically, for example, the obtained detection data is as follows: u of test point on 220kV bus0The value is 229.7kV, and the U0 value of a test point on a 35kV bus is 36.06 kV. Generally, two voltage values with larger adjustment range and corresponding reactive power value are selected, and U of a test point on a 220kV bus1229.73kV corresponding to reactive power Q1Is 2.33 Mvar; u shape2231.4kV corresponding to a reactive power Q2It was 18.14 Mvar. U of test point on 35kV bus136.07kV, corresponding to a reactive power Q1Is 2.344 Mvar; u shape2Is 37.03kV, corresponding to the reactive power Q2It was 20.93 Mvar. Thus, U is known1And U2Can obtain delta U, Q1And Q2Δ Q can be obtained, and the data is substituted into the formula (1) to calculate that the 220kV bus short-circuit capacity is 2269.72MVA and the 35kV bus short-circuit capacity is 698.14 MVA.
Further, the result of the bus short-circuit capacity obtained above can be verified. Taking the verification of the short-circuit capacity of the 35kV bus as an example, the method specifically comprises the following steps: FIG. 8 is a simplified schematic diagram of a wind field primary system in an application scenario of the bus short circuit capacity testing method shown in FIG. 2The system impedance can be calculated from fig. 8. Supposing that the short-circuit capacity of a 220kV bus grid-connected point is known to be 2269.72MVA, the reference capacity of the parameters of the main transformer of the wind power plant is selected SB100MVA, the reference voltage is equal to the average rated voltage, i.e. 220kV system reference voltage UB1230kV, 35kV system reference voltage UB2Calculating the secondary side short-circuit capacity of the main transformer according to an equation (5) for calculating a reference impedance value, an equation (6) for calculating a per unit system impedance value, an equation (7) for calculating a per unit main transformer impedance value, and an equation (8) for calculating the secondary side short-circuit capacity of the main transformer:
wherein, XB2For a reference impedance value of the transformer, UB2Is a reference voltage value, S, of a 35kV systemBFor the reference capacity, X, of the transformerSCIs the per unit value of system impedance, XSCIs a known value of system impedance, XBIs a reference value of the system impedance, SSCIs the short circuit capacity, X, of a 220kV bus grid-connected pointT*(B)Is the per unit value of the impedance of the main transformer, XT*(N)Is the per unit value of the short circuit impedance of the voltage transformer nameplate, UTNFor rated voltage of transformer, STNRated capacity of transformer, UBIs a reference value of the voltage of the transformer, UB1Is a 220kV system reference voltage value, XB2Is a reference impedance value of 35 kV.
In the above formula (6),due to the system impedance XSCIt means the system impedance of 220kV side, therefore, the reference voltage of 220kV side, namely U is taken in the approximate calculationB1Instead of UB2。
Therefore, the calculated secondary side short-circuit capacity of the main transformer is 704.22MVA, namely the secondary side of the main transformer is the 35kV bus side, and the result of the short-circuit capacity 698.14MVA of the 35kV bus tested by applying the embodiment of the invention is very close to the result of the short-circuit capacity 704.22MVA obtained by the calculation. Therefore, the bus short-circuit capacity testing method provided by the embodiment of the invention can accurately test the bus short-circuit capacity.
According to the bus short-circuit capacity testing method, the voltage value when the reactive power of the testing point on the bus is zero, at least two groups of reactive power values and the voltage values corresponding to the reactive power values are obtained, and further, the bus short-circuit capacity is accurately and dynamically tested according to the reactive power compensation relation of the wind power plant, the voltage value when the reactive power is zero, the at least two groups of reactive power values and the voltage values corresponding to the at least two groups of reactive power values, so that a basis is provided for judging the strength of an access system of the wind power plant, a reference basis is provided for adjusting control parameters of a fan and a reactive power compensation device, and the practicability is high.
Example two
Fig. 9 is a schematic structural diagram of a bus short-circuit capacity testing apparatus according to a second embodiment of the present invention. The method can be used for executing the steps of the bus short circuit capacity testing method in the first embodiment of the invention.
Referring to fig. 9, the bus short-circuit capacity testing apparatus includes a power and voltage acquisition module 901 and a short-circuit capacity calculation module 902.
The power and voltage obtaining module 901 is configured to obtain a voltage value when the reactive power of the test point on the bus is zero, at least two groups of reactive power values, and voltage values corresponding to the at least two groups of reactive power values.
The short-circuit capacity calculation module 902 is configured to obtain a bus short-circuit capacity according to a reactive power compensation relationship of the wind farm, a voltage value when the reactive power is zero, at least two groups of reactive power values, and voltage values corresponding to the at least two groups of reactive power values.
Specifically, the short circuit capacity calculation module 902 may include:
the change value calculation unit (not shown in the figure) is used for calculating a reactive power change value and a voltage change value according to at least two groups of reactive power values and voltage values thereof;
and the short-circuit capacity calculation unit (not shown in the figure) is used for calculating the bus short-circuit capacity according to the reactive power compensation relation, the reactive power change value and the voltage change value of the wind power plant and the voltage value when the reactive power is zero.
Preferably, the short circuit capacity calculation unit may be configured to calculate the bus short circuit capacity according to the following equation (9):
wherein S isSCFor short-circuit capacity of bus, U0The voltage value at the test point when the reactive power is zero, the delta Q is the reactive power change value at the test point, and the delta U is the voltage change value at the test point.
Further, the wind farm may include a reactive power compensation device, and the power and voltage obtaining module 901 is configured to detect a voltage value when the reactive power of the test point on the bus is zero, and at least two groups of reactive power values and voltage values corresponding to the two groups of reactive power values by adjusting an output capacity of the reactive power compensation device.
The power and voltage obtaining module 901 is used for obtaining a preset voltage operation range and a static short-circuit capacity of a test point; calculating the regulation range of the output capacity according to the voltage operation range and the static short circuit capacity; and adjusting the output capacity of the reactive power compensation device according to the calculated adjustment range of the output capacity and the preset adjustment step length.
Preferably, the bus bar may be embodied as a grid-tie bus bar and/or a collector bus bar.
According to the bus short-circuit capacity testing device, the voltage value when the reactive power of the testing point on the bus is zero, at least two groups of reactive power values and voltage values corresponding to the reactive power values are obtained, and further, the bus short-circuit capacity is accurately and dynamically tested according to the reactive power compensation relation of the wind power plant, the voltage value when the reactive power is zero, the at least two groups of reactive power values and the voltage values corresponding to the at least two groups of reactive power values, so that a basis is provided for judging the strength of an access system of the wind power plant, a reference basis is provided for adjusting control parameters of a fan and the reactive power compensation device, and the bus short-circuit capacity testing device is high.
EXAMPLE III
The bus short-circuit capacity testing system comprises an acquisition device and a processor. The acquiring device is used for acquiring a voltage value when the reactive power of the test point on the bus is zero, at least two groups of reactive power values and voltage values corresponding to the reactive power values. The processor is used for obtaining the bus short-circuit capacity according to the reactive power compensation relation of the wind power plant, the voltage value when the reactive power is zero, at least two groups of reactive power values and the voltage values corresponding to the two groups of reactive power values.
It should be noted that the acquiring device may be, but is not limited to, an electric energy quality tester or other power and voltage detecting devices.
According to the bus short-circuit capacity testing system, the voltage value when the reactive power of the testing point on the bus is zero, at least two groups of reactive power values and the voltage values corresponding to the two groups of reactive power values are obtained, and further, the bus short-circuit capacity is accurately and dynamically tested according to the reactive power compensation relation of the wind power plant, the voltage value when the reactive power is zero, the at least two groups of reactive power values and the voltages corresponding to the two groups of reactive power values, so that a basis is provided for judging the strength of an access system of the wind power plant, a reference basis is provided for adjusting control parameters of a fan and a reactive power compensation device, and the system is high in practicability.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (5)
1. A method for determining short-circuit capacity of a collector bus of a wind power plant is characterized by comprising the following steps of:
acquiring a voltage value when the reactive power of a grid-connected bus test point is zero, at least two groups of reactive power values and voltage values corresponding to the reactive power values;
obtaining the short-circuit capacity of the grid-connected bus according to the reactive power compensation relation of the wind power plant, the voltage value when the reactive power is zero, the at least two groups of reactive power values and the voltage values corresponding to the at least two groups of reactive power values;
calculating the short-circuit capacity of a bus of a collector wire bus based on the short-circuit capacity of the grid-connected bus according to the primary system structure of the wind power plant;
the method comprises the following steps of calculating the short-circuit capacity of the collector bus according to the primary system structure of the wind power plant and based on the short-circuit capacity of the grid-connected bus, wherein the step of calculating the short-circuit capacity of the collector bus comprises the following steps:
calculating a transformer reference impedance according to a collector bus reference voltage value and a transformer reference capacity value, wherein the transformer reference impedance is calculated according to the following expression:
wherein, XB2For a reference impedance value of the transformer, UB2Bus reference voltage value, S, for bus current collectionBIs the reference capacity of the transformer;
calculating a per unit value of the system impedance according to the named value of the system impedance and a reference value of the system impedance, wherein the per unit value of the system impedance is calculated according to the following expression:
wherein, XSC*Is the per unit value of the system impedance, XSCIs a known value of system impedance, XBIs a reference value of the system impedance, SSCFor short-circuit capacity of grid-connected bus, UB1For the grid-connected bus reference voltage value, SBIs the reference capacity of the transformer;
converting the per-unit value of the short-circuit impedance of the transformer nameplate into a per-unit value of the transformer impedance, wherein the per-unit value of the transformer impedance is calculated according to the following expression:
wherein, XT*(B)Is the per unit value of the transformer impedance, XT*(N)Is the per unit value of the short circuit impedance of the voltage transformer nameplate, UTNFor rated voltage of transformer, STNRated capacity of transformer, UB1For the grid-connected bus reference voltage value, SBIs the reference capacity of the transformer;
calculating the short-circuit capacity of the current collecting wire bus according to the current collecting wire bus reference voltage value, the sum of the per unit system impedance value and the per unit transformer impedance value and the transformer reference impedance, wherein the short-circuit capacity of the current collecting wire bus is calculated according to the following expression:
wherein S is2For collecting short-circuit capacity of bus lineB2Is a 35kV current collecting bus reference voltage value, XSC*Is the per unit value of the system impedance, XT*(B)Is the per unit value of the transformer impedance, XB2The reference impedance value of the transformer.
2. The method for determining according to claim 1, wherein the obtaining the bus short-circuit capacity according to the reactive power compensation relationship of the wind farm, the voltage value when the reactive power is zero, the at least two groups of reactive power values and the voltage values corresponding to the at least two groups of reactive power values comprises:
calculating a reactive power change value and a voltage change value according to the at least two groups of reactive power values and the voltage values thereof;
and calculating the short-circuit capacity of the grid-connected bus according to the reactive power compensation relation of the wind power plant, the reactive power change value and the voltage change value, and the voltage value when the reactive power is zero.
3. The determination method according to claim 2, wherein the calculating the grid-connected bus short-circuit capacity according to the reactive power compensation relationship of the wind farm, the reactive power variation value and the voltage variation value, and the voltage value when the reactive power is zero comprises:
according to
Calculating the short-circuit capacity of the grid-connected bus, wherein SSCFor short-circuit capacity of grid-connected bus, U0The voltage value at the test point when the reactive power is zero, the delta Q is the reactive power change value at the test point, and the delta U is the voltage change value at the test point.
4. The determination method according to claim 1, wherein the wind farm comprises a reactive power compensation device, and the obtaining of the voltage value when the reactive power of the grid-connected bus test point is zero, and the at least two groups of reactive power values and the voltage values corresponding to the at least two groups of reactive power values comprise:
and detecting the voltage value when the reactive power of the grid-connected bus test point is zero, at least two groups of reactive power values and the voltage values corresponding to the reactive power values by adjusting the output capacity of the reactive power compensation device.
5. The method of claim 4, wherein said adjusting the output capacity of the reactive power compensation device comprises:
acquiring a preset voltage operation range and a static short circuit capacity of the grid-connected bus test point;
calculating the adjusting range of the output capacity according to the voltage operating range and the static short circuit capacity;
and adjusting the output capacity of the reactive power compensation device according to the calculated adjustment range of the output capacity and a preset adjustment step length.
Priority Applications (1)
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| CN108183490B (en) * | 2016-12-08 | 2020-11-10 | 北京金风科创风电设备有限公司 | Control gain adjustment method, device and system for reactive compensation device |
| CN110297150B (en) | 2018-03-21 | 2020-10-23 | 北京金风科创风电设备有限公司 | Wind generating set grid-connected point short circuit capacity detection method and device |
| CN109031000B (en) * | 2018-08-03 | 2019-08-16 | 贵州电网有限责任公司电网规划研究中心 | A kind of method and system based on non-faulting disturbance In situ Measurement grid short circuit capacity |
| CN109672191A (en) * | 2019-01-21 | 2019-04-23 | 华北电力大学 | The screening technique of large-scale wind power field collection region sub-synchronous oscillation risk |
| CN110542822A (en) * | 2019-09-06 | 2019-12-06 | 贵州电网有限责任公司 | method for measuring short-circuit current and short-circuit impedance of power grid based on reactive power disturbance |
| CN112881782A (en) * | 2020-12-30 | 2021-06-01 | 广东电网有限责任公司电力科学研究院 | Single-phase short-circuit current online monitoring method and device for power system |
| CN112881822B (en) * | 2021-01-07 | 2023-06-02 | 国网河北省电力有限公司电力科学研究院 | Detection method and equipment for voltage control function of wind farm |
| CN114336595A (en) * | 2021-12-03 | 2022-04-12 | 广东电网有限责任公司汕头供电局 | Capacitor harmonic evaluation method and monitoring device based on actually measured short-circuit capacity |
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| JP2012163384A (en) * | 2011-02-04 | 2012-08-30 | Chugoku Electric Power Co Inc:The | Short circuit capacity measuring system |
| CN102347614A (en) * | 2011-09-26 | 2012-02-08 | 武汉大学 | Voltage stability analyzing method and device based on short circuit capacity |
| CN103050979B (en) * | 2012-11-16 | 2015-03-25 | 国网智能电网研究院 | Calculation method of voltage of connecting bus of static var compensator of power grid |
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