CN109358244B - Power generation lifting test system and method of modularized wind power converter - Google Patents
Power generation lifting test system and method of modularized wind power converter Download PDFInfo
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- CN109358244B CN109358244B CN201811159147.XA CN201811159147A CN109358244B CN 109358244 B CN109358244 B CN 109358244B CN 201811159147 A CN201811159147 A CN 201811159147A CN 109358244 B CN109358244 B CN 109358244B
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Abstract
The invention provides a power generation lifting test system and a power generation lifting test method for a modularized wind power converter, wherein the power generation lifting test system comprises the following components: the direct current bus bar is divided into a first direct current bus bar and a second direct current bus bar; the first direct-current voltage detection device and the second direct-current voltage detection device are respectively arranged on the first direct-current bus bar and the second direct-current bus bar; the first electric quantity metering device and the second electric quantity metering device are respectively arranged on the first alternating current bus bar and the second alternating current bus bar. The method can accurately determine the power increasing rate of the modular wind power converter after the alternating start-stop strategy is adopted.
Description
Technical Field
The invention relates to the field of wind power generation testing. And more particularly, to a system and method for power generation lift testing of a modular wind power converter.
Background
Fig. 1 shows a topological schematic diagram of an existing modular wind power converter. As shown in fig. 1, the modular wind power converter includes a plurality of parallel-connected converter modules 100, and the converter modules 100 adopt a modular architecture, so that any module can be connected in parallel. The input ends of a plurality of parallel converter modules 100 are connected with the wind driven generator M, the output ends are connected with the isolation transformer IT, and the direct currents of all the modular converters are converged through a direct current bus bar 200. The modular converter may employ a standard cabinet and the components comprised by the converter module 100 may be arranged in the standard cabinet.
The current transformation module 100 can independently realize all functions of current transformation, and can also realize incremental increase of capacity through parallel connection, thereby greatly simplifying the difficulty of production, manufacture, operation and maintenance, and simultaneously reducing the equipment cost through large-scale production and purchase. Meanwhile, the grid-connected power generation efficiency of the low-power section can be improved by cutting off the number of the operating converter modules 100 in the low-power section (i.e. the alternate start-stop strategy).
In the field of wind power generation, the more and more refined electricity consumption pursuit cost is increased, the conversion efficiency of the modularized wind power converter at different load ratios is improved through the number of the converter modules 100 which are put into operation, the loss of the converter can be effectively reduced, and the generated energy is increased. The general operators perform important assessment on the generated energy, and the assessment of the power generation improvement effect brought by the alternate start-stop strategy of the converter module 100 directly influences the selection of converter equipment and the assessment of the power consumption cost of the wind power operators.
Fig. 2 shows a schematic diagram of a conventional permanent magnet wind turbine generator rotation start-stop power generation evaluation test platform. As shown in fig. 2, the power generation amount evaluation test platform is used for power generation lifting evaluation of a rotation start-stop strategy under laboratory conditions, and tests a dragging motor. After power is taken from a 33kV/690V isolation transformer IT, a variable frequency speed regulation device VSC supplies power to a dragging motor M ', the dragging motor M ' rotates at a constant speed, the dragging motor M ' drags a permanent magnet synchronous motor PMG through a rigid connecting shaft, the permanent magnet synchronous motor PMG is subjected to torque given control by a converter to be tested DUT (the converter to be tested can be a full-power modular converter), and the output end of the converter to be tested DUT is directly connected to the grid to form a circulating current. And respectively measuring the input power P3 and the output power P4 of the converter DUT to be tested and the power supply power P5 of the auxiliary power supply AP, wherein (P4-P5)/P3 is the conversion efficiency of the converter DUT to be tested.
Comparing a conversion efficiency curve eta 1 of a converter to be tested DUT with a rotation start-stop strategy and a conversion efficiency curve eta 2 of a converter to be tested DU without the rotation start-stop strategy within a full power range (0-100% power), obtaining a final efficiency difference eta 1-eta 2 curve, and carrying out polynomial fitting on the power and efficiency difference curves to obtain a corresponding efficiency difference at any power value. And multiplying the efficiency difference by the corresponding power value to obtain a power generation lifting value in unit time brought by the alternate start-stop strategy under the calibrated grid-connected power.
Because the wind frequency and wind speed fluctuation of an actual site cannot be accurately simulated in a laboratory environment, the matching of the wind frequency and wind speed fluctuation with a fan power generation system and a fan control system cannot be verified, and the transient process of a rotation start-stop strategy in the wind shear process cannot be evaluated, the power generation amount increase value calculated under the laboratory condition cannot reflect the power generation amount increase value of the actual site.
In summary, the existing power generation lifting evaluation method of the alternating start-stop strategy of the modular wind power converter cannot accurately evaluate the lifting condition of power generation.
Disclosure of Invention
The invention aims to provide a power generation lifting test system and a power generation lifting test method for a modularized wind power converter, and aims to solve the technical problem that the existing power generation lifting evaluation method cannot accurately evaluate the lifting condition of generated energy.
One aspect of the present invention provides a power generation lifting test system for a modular wind power converter, where the modular wind power converter includes a plurality of converter modules connected in parallel, and dc currents of all the converter modules are converged by a dc bus bar, and the power generation lifting test system includes: the direct current bus bar is divided into a first direct current bus bar and a second direct current bus bar; the first direct-current voltage detection device and the second direct-current voltage detection device are respectively arranged on the first direct-current bus bar and the second direct-current bus bar; the first electric quantity metering device and the second electric quantity metering device are respectively arranged on a first alternating current bus bar and a second alternating current bus bar and are respectively used for measuring the electric energy generation of the first converting module group and the second converting module group, wherein the grid side alternating current of the first converting module group is converged through the first alternating current bus bar, and the grid side alternating current of the second converting module group is converged through the second alternating current bus bar.
Optionally, the first number of the converter modules included in the first converter module group is equal to the second number of the converter modules included in the second converter module group.
Optionally, the wind power generator connected to the modular wind power converter is a single-winding wind power generator, wherein a three-phase current output end of the single-winding wind power generator is connected to a three-phase current input end of each of the plurality of parallel converter modules, and a three-phase current output end of each of the plurality of parallel converter modules is connected to a three-phase current input end of the isolation transformer.
Optionally, the wind power generator connected with the modular wind power converter is a double-winding wind power generator, wherein a three-phase current output end of one set of three-phase winding of the double-winding wind power generator is connected with a three-phase current input end of each converter module in the first converter module group, a three-phase current output end of the other set of three-phase winding of the double-winding wind power generator is connected with a three-phase current input end of each converter module in the second converter module group, and a three-phase current output end of each converter module in the plurality of parallel converter modules is connected with a three-phase current input end of the isolation transformer.
In another aspect of the present invention, a power generation lifting test method for a modular wind power converter is provided, where the method includes: controlling a wind generating set to perform test power generation, wherein a first converter module group or a second converter module group is started to rotate to start and stop, and a machine side torque given value of the first converter module group and a machine side torque given value of the second converter module group are determined according to a first number of the first converter module groups and a second number of the second converter module groups; acquiring power data of the wind generating set within the preset time interval at intervals of preset time, and acquiring first generating capacity and second generating capacity of the first converting module group and the second converting module group within the preset time interval; and determining a power boost rate corresponding to each power value interval according to power data, a first power generation amount and a second power generation amount in a preset number of preset time intervals, wherein each power value interval is a power value interval formed by equally dividing a power range capable of being output by the wind generating set according to a certain power interval, and the power boost rate is a percentage of the power output by the wind generating set after the rotation start-stop function is started by the plurality of parallel converter modules and is relative to the power output by the wind generating set before the rotation start-stop function is started.
Optionally, at preset time intervals, the first converter module group and the second converter module group are alternately turned on to start and stop the rotation function.
Optionally, the machine-side torque given value of the first converter module group is a ratio of a first number to a total number multiplied by a total machine torque given value, the machine-side torque given value of the second converter module group is a ratio of a second number to the total number multiplied by a total machine torque given value, wherein the total number is a sum of the first number and the second number, and the total machine torque given value is a torque given value of the wind turbine generator set.
Optionally, the first number is equal to the second number, the power data in the predetermined time interval includes power values at each time in the predetermined time interval, and the predetermined number is greater than or equal to the number of the power value intervals, where the power boost rate corresponding to each power value interval is determined according to the accumulated time of all the power values in each power value interval in each predetermined time interval, the power generation amount of the converter module group with the switched start-stop function in each predetermined time interval, and the power generation amount of the converter module group without the switched start-stop function in each predetermined time interval.
Optionally, the method further comprises: acquiring wind resource data of the position of the wind generating set in an evaluation time period; and determining the generated energy which is increased after the wind generating set starts the rotation start-stop function in the evaluation time period relative to the generated energy which is increased before the rotation start-stop function is started according to the wind resource data and the power increasing rate corresponding to each power value interval.
Another aspect of the present invention provides a power generation lifting test apparatus for a modular wind power converter, comprising: the test power generation control unit is used for controlling the wind generating set to perform test power generation, wherein a first converter module group or a second converter module group is started to rotate to start and stop, and a machine side torque given value of the first converter module group and a machine side torque given value of the second converter module group are determined according to a first number of the first converter module groups and a second number of the second converter module groups; the acquiring unit is used for acquiring power data of the wind generating set in a preset time interval at intervals of preset time, and acquiring a first generating capacity and a second generating capacity of the first current converting module group and the second current converting module group in the preset time interval; the determining unit determines a power boost rate corresponding to each power value interval according to power data, a first power generation amount and a second power generation amount in a preset number of preset time intervals, wherein each power value interval is a power value interval formed by equally dividing a power range capable of being output by the wind generating set according to a certain power interval, and the power boost rate is a power boost percentage of power output by the wind generating set after the plurality of parallel converter modules start the rotation start-stop function relative to power output by the wind generating set before the rotation start-stop function is started.
Optionally, the test power generation control unit controls the first converter module group and the second converter module group, and alternately starts a rotation start-stop function at predetermined time intervals.
Optionally, the machine-side torque given value of the first converter module group is a ratio of a first number to a total number multiplied by a total machine torque given value, the machine-side torque given value of the second converter module group is a ratio of a second number to the total number multiplied by a total machine torque given value, wherein the total number is a sum of the first number and the second number, and the total machine torque given value is a torque given value of the wind turbine generator set.
Optionally, the first number is equal to the second number, the power data in the predetermined time interval includes power values at each time in the predetermined time interval, and the predetermined number is greater than or equal to the number of the power value intervals, wherein the determining unit determines the power boost rate corresponding to each power value interval according to the accumulated time of all the power values in each power value interval in each predetermined time interval, the power generation amount of the converter module group with the switched start-stop function in each predetermined time interval, and the power generation amount of the converter module group without the switched start-stop function in each predetermined time interval.
Optionally, the method further comprises: the evaluation unit is used for acquiring wind resource data of the position of the wind generating set in an evaluation time period; and determining the generated energy which is increased after the wind generating set starts the rotation start-stop function in the evaluation time period relative to the generated energy which is increased before the rotation start-stop function is started according to the wind resource data and the power increasing rate corresponding to each power value interval.
Another aspect of the invention provides a computer readable storage medium having stored therein a computer program which, when executed, implements a method as described above.
According to the power generation lifting test system and method of the modular wind power converter, the plurality of parallel current conversion modules are divided into two independent parts through the direct current switches, one part is started to rotate the start-stop function while the other part is not started to rotate the start-stop function during testing, and the power lifting rate of the modular wind power converter caused by the rotation start-stop strategy can be accurately determined according to the difference value of the generated energy of the two parts.
In addition, according to the power increasing rate and wind resource data obtained by evaluation before site selection of the wind generating set, the power generation amount increasing value caused by the adoption of the alternate start-stop strategy can be accurately calculated, and a more accurate and reliable quantitative analysis result can be provided for a wind power operator.
Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a topological schematic of an existing modular wind power converter;
FIG. 2 shows a schematic diagram of a conventional permanent magnet wind turbine generator alternate start-stop power generation evaluation test platform;
FIG. 3 shows a topology diagram of a power generation boost test system of a modular wind power converter according to an embodiment of the invention;
FIG. 4 shows a topology diagram of a power generation boost test system of a modular wind power converter according to another embodiment of the present invention;
FIG. 5 shows a flow diagram of a method of performing a power generation boost test of a modular wind power converter according to another embodiment of the present invention;
fig. 6 shows an example of a conversion efficiency curve of a modular wind power converter without starting a rotation start-stop function;
fig. 7 shows a block diagram of an apparatus for performing a power generation boost test of a modular wind power converter according to another embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Fig. 3 and 4 show topological diagrams of a power generation lifting test system of a modular wind power converter according to an embodiment of the present invention. Specifically, the wind turbine of fig. 3 is a single-winding wind turbine, and the wind turbine of fig. 4 is a double-winding wind turbine. Preferably, the wind power generator in the embodiment of the present invention is a permanent magnet direct drive wind power generator, and correspondingly, the converter is a full power converter.
As shown in fig. 3 and 4, the modular wind power converter of the wind generating set includes a plurality of converter modules 100 connected in parallel, and the direct current of all the converter modules 100 is subjected to direct current bus through a direct current bus bar 200, where the direct current bus bar is used to respectively short the positive electrodes and the negative electrodes of the plurality of direct current bus bars together. The number of the converter modules 100 in the power generation lifting test system of the modular wind power converter according to the embodiment of the present invention is not limited to 4 shown in fig. 3 and 4, and may be other numbers.
The three-phase current output ends of the plurality of parallel converter modules 100 are connected with the three-phase current input end of an isolation transformer IT, which is an isolation transformer of the wind generating set connected to a wind power plant current collection circuit.
The three-phase current output end of the single-winding wind driven generator M1 is respectively connected with the three-phase current input end of each converter module 100 in the plurality of parallel converter modules 100.
The three-phase current output end of one set of three-phase winding of the double-winding wind driven generator M2 is respectively connected with the three-phase current input end of each converter module 100 in the first converter module group, the three-phase current output end of the other set of three-phase winding of the double-winding wind driven generator M2 is respectively connected with the three-phase current input end of each converter module 100 in the second converter module group, and the specific meanings of the first converter module group and the second converter module group will be described below.
The invention does not limit the internal structure and elements of the converter module 100, and all structures and element combinations capable of realizing wind power conversion function can be used in the invention. For example, as shown in fig. 3 and 4, the converter module 100 may include a first switch Q1, a machine-side Filter DUDT, a machine-side rectifier 101, a grid-side inverter 102, a grid-side Filter, and a second switch Q2, and the connection manner between the elements is clear to those skilled in the art and will not be described herein.
The power generation lifting test system comprises a direct current switch K1, a first direct current voltage detection device 300, a second direct current voltage detection device 400, a first electricity metering device 500 and a second electricity metering device 600.
The dc switch K1 is provided on the dc bus bar 200 between the first and second converter module groups, and divides the dc bus bar 200 into a first dc bus bar 201 and a second dc bus bar 202. As an example, the dc switch K1 may be a contactor, an Insulated Gate Bipolar Transistor (IGBT), or the like having controllable pull-in and pull-off.
The first current transforming module group is composed of a part of the current transforming modules 100 in the plurality of current transforming modules 100 connected in parallel, and the second current transforming module group is composed of another part of the current transforming modules 100 in the plurality of current transforming modules 100 connected in parallel. The first number of the converter modules 100 included in the first converter module group and the second number of the converter modules 100 included in the second converter module group may be equal, may also be unequal, and preferably is equal. The modular wind power converter shown in fig. 3 and 4 includes four converter modules 100, and the converter modules 100 in the figure are sorted from top to bottom, the first converter module group includes a first modular converter and a second modular converter, and the second converter module group includes a third modular converter and a fourth modular converter.
The grid-side alternating current of the first current transformation module group is converged by the first alternating current bus bar 700, and the grid-side alternating current of the second current transformation module group is converged by the second alternating current bus bar 800.
When the wind generating set is tested to generate power, the direct current switch K1 is in an off state, so that the first converter module group and the second converter module group can be separated and independently converted; when the wind generating set normally generates power, the direct current switch K1 is in a closed state, so that the first converter module group and the second converter module group can be used for carrying out current conversion together.
The first and second dc voltage detecting devices 300 and 400 are respectively provided on the first and second dc bus bars 201 and 202, and respectively detect voltages of the first and second dc bus bars 201 and 202, the detected voltages being used to participate in Pulse Width Modulation (PWM) of the machine side and the grid side.
The first electricity metering device 500 and the second electricity metering device 600 are respectively arranged on the first alternating current bus bar 700 and the second alternating current bus bar 800 and are respectively used for measuring the electricity generation amount of the first current transformation module group and the second current transformation module group, the measured electricity generation amount is used for determining the power boost rate, and a specific determination method will be described in detail below.
Fig. 5 shows a flow chart of a method of performing a power generation boost test of a modular wind power converter according to an embodiment of the invention. The method of the power generation lifting test can be performed on the basis of the power generation lifting test system shown in fig. 3 or fig. 4.
Referring to fig. 5, in step S10, the wind turbine generator set is controlled to perform test power generation.
When the test generates electricity, the direct current bus bar between the first converter module group and the second converter module group is disconnected (for example, the direct current switch is disconnected), so that the first converter module group and the other first converter module group independently perform current transformation, and the first converter module group or the other first converter module group is turned on to alternately start and stop the function. Preferably, at predetermined time intervals, the first group of converter modules and the other first group of converter modules are alternately turned on to rotate the start-stop function, so that the deviation of the subsequently calculated power boost rate can be reduced.
When testing power generation, an independent control algorithm is adopted to respectively control the first current transformation module group and the other first current transformation module group to work independently without mutual interference, and the control algorithm of the wind generating set during testing power generation will be described in detail below.
As an example, the machine-side torque setpoint of the first set of converter modules and the machine-side torque setpoint of the second set of converter modules are determined as a function of a first number of first set of converter modules and a second number of second set of converter modules.
As an example, in order to distribute the power of the wind generating set to each converter module evenly for calculating the power boost rate in the subsequent steps, the machine side torque given value of the first converter module group is the ratio of the first number to the total number multiplied by the total machine torque given value, and the machine side torque given value of the second converter module group is the ratio of the second number to the total number multiplied by the total machine torque given value, wherein the total number is the sum of the first number and the second number, and the total machine torque given value is the torque given value of the wind generating set, namely the torque given value given by the main controller of the wind generating set.
And when the first number is equal to the second number, the machine side torque set value of the first converting module group and the machine side torque set value of the second converting module group are half of the whole machine torque set value.
And the machine side controller of the modularized wind power converter adopts an independent machine side control algorithm to respectively control the first current converting module group and the second current converting module group to carry out PWM modulation according to the machine side torque set value of the first current converting module group, the voltage of the first direct current bus bar, the machine side torque set value of the second current converting module group and the voltage of the second direct current bus bar.
In step S20, at predetermined time intervals, power data (output power) of the wind turbine generator set within the predetermined time intervals are obtained, and a first power generation amount and a second power generation amount of the first converter module group and the second converter module group within the predetermined time intervals are obtained.
As an example, wind frequency data of the wind turbine generator set within a predetermined time interval may be obtained, and the power data may be obtained according to a corresponding relationship between the wind frequency data and the power data.
As an example, the predetermined time interval may be 1 day, and at step S20, power data of the wind turbine generator set on days 1 and 2 d … … are acquired, and a first power generation amount and a second power generation amount on days 1 and 2 d … … are acquired.
In step S30, a power boost rate corresponding to each power value interval is determined according to the power data, the first power generation amount and the second power generation amount in a predetermined number of predetermined time intervals.
Each power value interval is a power value interval formed by equally dividing the power range capable of being output by the wind generating set according to a certain power interval.
The power boost rate refers to the percentage of the output power of the wind generating set after the plurality of parallel converter modules start the alternate start-stop function, relative to the output power of the wind generating set before the alternate start-stop function is started.
As an example, the power data in the predetermined time interval includes power values at respective times in the predetermined time interval, and the accumulated time of all the power values in the respective power value intervals in the respective predetermined time intervals may be determined according to the power data in the respective predetermined time intervals.
As an example, when the first number is equal to the second number and the predetermined number is greater than or equal to the number of the power value intervals, the power boost rate corresponding to each power value interval may be determined according to the accumulated time of all the power values in each power value interval in each predetermined time interval, the power generation amount of the converter module group turned on for the rotation start-stop function in each predetermined time interval, and the power generation amount of the converter module group not turned on for the rotation start-stop function in each predetermined time interval.
As an example, when the first number is equal to the second number and the predetermined number (the number of predetermined time intervals) is greater than or equal to the number of power value intervals, the power boost rate corresponding to each power value interval may be determined according to the following equation.
Wherein Nc represents the median of the c-th power value interval, η c represents the power boost rate corresponding to the c-th power value interval, Tcd represents the accumulated time of all the power values in the c-th power value interval in the d-th time interval, Md represents the power generation amount of the partial converter module which is started to rotate the start-stop function in the d-th time interval, and Ld represents the power generation amount of the partial converter module which is not started to rotate the start-stop function in the d-th time interval.
The equation set can be used to solve η 1 to η c, and a power boost rate curve can be obtained according to η 1 to η c and the corresponding power value interval.
As an example, the method for performing a power generation boost test according to an embodiment of the present invention may further include (not shown in the drawings): acquiring wind resource data of an evaluation time period of the position of the wind generating set; and determining the generated energy which is increased after the wind generating set starts the alternate start-stop function in the evaluation time period relative to the generated energy which is increased before the alternate start-stop function is started.
As an example, the accumulated time of all power values in each power value interval in the evaluation time period is obtained according to the wind resource data, and the power generation amount increased after the wind generating set starts the rotation start-stop function in the evaluation time period relative to the power generation amount increased before the rotation start-stop function is started is determined according to the accumulated time of all power values in each power value interval in the evaluation time period and the power increase rate corresponding to each power value interval.
As an example, the accumulated time of all the power values in each power value interval in the evaluation time period is multiplied by the median value of each power value interval, and multiplied by the power boost rate corresponding to each power value interval to obtain the power generation amount boost value corresponding to each power value interval, and then the power generation amount boost values corresponding to each power value interval are added and summed to obtain the boosted power generation amount.
During testing, the machine side control algorithm and the network side control algorithm of the converter module can adopt the control algorithm of a full-power converter in the prior art when the permanent magnet direct-drive wind generating set operates normally, and the difference between the machine side control algorithm and the network side control algorithm is that the machine side torque set value is different from the prior art.
As an example, the first number of the first converter module group is equal to the second number of the second converter module group, and the machine-side torque set value of the first converter module group and the machine-side torque set value of the second converter module group are both half of the total machine torque set value. And the machine side controller of the modularized wind power converter adopts an independent machine side control algorithm according to the voltage of the first direct current bus bar and the voltage of the second direct current bus bar to respectively control the first current converting module group and the second current converting module group to carry out PWM modulation so as to output respective machine side torque set values.
A grid side controller of the modularized wind power converter maintains the voltage stability of respective direct current buses of the upper part and the lower part, and stable active power and reactive power are transmitted to a power grid by adopting respectively independent control algorithms.
And adopting independent network side control algorithms for the first current transformation module group and the second current transformation module group respectively. The grid side control algorithm maintains the voltage stability of the direct current bus and transmits active power and reactive power to the power grid, and a double-loop control strategy of a voltage outer loop and a current inner loop is adopted. The network side control algorithm of the first current transformation module group is described below, and the network side control algorithm of the second current transformation module group is the same as that of the first current transformation module group.
Through the machine side control algorithm and the network side control algorithm, the first converter module group and the second converter module group shown in fig. 3 and 4 can work independently without mutual interference. Because the torque settings of the two converter module groups are consistent, namely the power of the power distribution machine is averagely distributed, the input power of the two converter module groups is completely consistent. When the two converter module groups have different losses, the difference of grid-connected power generation amount of the two converter module groups can be reflected.
Fig. 6 shows an example of a conversion efficiency curve of a modular wind power converter without a start-stop rotation function. As can be seen from the conversion efficiency curve shown in fig. 6, the efficiency curve has a sharp downward turning point below the power point of 1/4, i.e. below 500KW, because the main heating component semiconductor and the reactor of the converter do not have a linear relationship in the power region, and in the low power region, the iron loss of the reactor occupies the main loss of the reactor, and the switching loss of the semiconductor also occupies the main loss of the semiconductor device. If the number of the semiconductor devices and the number of the reactors are reduced, the rest of the semiconductor devices and the reactors can work in a range above an optimal working area or even in a full load range, the device loss can be effectively reduced, the conversion efficiency of the converter is improved, and the reason that efficiency improvement (power generation amount improvement) can be brought by alternately starting and stopping is also considered.
By way of example, in the embodiment of the present invention, the dc bus bar is divided into two parts, namely the first dc bus bar and the second dc bus bar, and the first converter module group or the second converter module group independently starts the rotation start/stop function, so that the number of the converter modules used can be reduced in a power range below 1/4 power point (i.e. when operating in the theoretically optimal rotation start/stop operation interval as shown in fig. 6).
Fig. 7 shows a block diagram of an apparatus for performing a power generation boost test of a modular wind power converter according to an embodiment of the present invention. The equipment for the power generation lifting test can be operated on the basis of the power generation lifting test system shown in fig. 3 or fig. 4. Referring to fig. 7, the apparatus for performing a power generation boost test of a modular wind power converter according to an embodiment of the present invention includes a test power generation control unit 10, an acquisition unit 20, and a determination unit 30.
The test power generation control unit 10 controls the wind turbine generator system to perform test power generation.
When the test generates electricity, the direct current bus bar between the first converter module group and the second converter module group is disconnected (for example, the direct current switch is disconnected), so that the first converter module group and the other first converter module group independently perform current transformation, and the first converter module group or the other first converter module group is turned on to alternately start and stop the function. Preferably, at predetermined time intervals, the first group of converter modules and the other first group of converter modules are alternately turned on to rotate the start-stop function, so that the deviation of the subsequently calculated power boost rate can be reduced.
When testing power generation, an independent control algorithm is adopted to respectively control the first current transformation module group and the other first current transformation module group to work independently without mutual interference, and the control algorithm of the wind generating set during testing power generation will be described in detail below.
As an example, the machine-side torque setpoint of the first set of converter modules and the machine-side torque setpoint of the second set of converter modules are determined as a function of a first number of first set of converter modules and a second number of second set of converter modules.
As an example, in order to distribute the power of the wind generating set to each converter module evenly for calculating the power boost rate in the subsequent steps, the machine side torque given value of the first converter module group is the ratio of the first number to the total number multiplied by the total machine torque given value, and the machine side torque given value of the second converter module group is the ratio of the second number to the total number multiplied by the total machine torque given value, wherein the total number is the sum of the first number and the second number, and the total machine torque given value is the torque given value of the wind generating set, namely the torque given value given by the main controller of the wind generating set. And when the first number is equal to the second number, the machine side torque set value of the first converting module group and the machine side torque set value of the second converting module group are half of the whole machine torque set value. And the machine side controller of the modularized wind power converter adopts an independent machine side control algorithm to respectively control the first current converting module group and the second current converting module group to carry out PWM modulation according to the machine side torque set value of the first current converting module group, the voltage of the first direct current bus bar, the machine side torque set value of the second current converting module group and the voltage of the second direct current bus bar.
The obtaining unit 20 obtains power data (output power) of the wind turbine generator set at predetermined time intervals, and obtains a first power generation amount and a second power generation amount of the first converter module group and the second converter module group at the predetermined time intervals.
As an example, wind frequency data of the wind turbine generator set within a predetermined time interval may be obtained, and the power data may be obtained according to a corresponding relationship between the wind frequency data and the power data.
As an example, the predetermined time interval may be 1 day, and at step S20, power data of the wind turbine generator set on days 1 and 2 d … … are acquired, and a first power generation amount and a second power generation amount on days 1 and 2 d … … are acquired.
The determining unit 30 determines the power boost rate corresponding to each power value interval according to the power data, the first power generation amount and the second power generation amount in a predetermined number of predetermined time intervals.
Each power value interval is a power value interval formed by equally dividing the power range capable of being output by the wind generating set according to a certain power interval.
The power boost rate refers to the percentage of the output power of the wind generating set after the plurality of parallel converter modules start the alternate start-stop function, relative to the output power of the wind generating set before the alternate start-stop function is started.
As an example, the power data in the predetermined time interval includes power values at respective times in the predetermined time interval, and the accumulated time of all the power values in the respective power value intervals in the respective predetermined time intervals may be determined according to the power data in the respective predetermined time intervals.
As an example, when the first number is equal to the second number and the predetermined number is greater than or equal to the number of the power value intervals, the power boost rate corresponding to each power value interval may be determined according to the accumulated time of all the power values in each power value interval in each predetermined time interval, the power generation amount of the converter module group turned on for the rotation start-stop function in each predetermined time interval, and the power generation amount of the converter module group not turned on for the rotation start-stop function in each predetermined time interval.
As an example, when the first number is equal to the second number and the predetermined number (the number of the predetermined time intervals) is greater than or equal to the number of the power value intervals, the power boost rate corresponding to each power value interval may be determined according to the above equation.
And obtaining a power lifting rate curve according to the power lifting rate corresponding to each power value interval.
As an example, the apparatus for performing the power generation elevating test according to the embodiment of the present invention may further include an evaluation unit (not shown in the drawings). The method comprises the steps that an evaluation unit obtains wind resource data of an evaluation time period of the position of a wind generating set; and determining the generated energy which is increased after the wind generating set starts the alternate start-stop function in the evaluation time period relative to the generated energy which is increased before the alternate start-stop function is started.
As an example, the evaluation unit obtains, according to the wind resource data, the accumulated time of all power values in each power value interval in the evaluation time period, and determines, according to the accumulated time of all power values in each power value interval in the evaluation time period and the power boost rate corresponding to each power value interval, the power generation amount that is increased after the wind turbine generator system starts the rotation start-stop function in the evaluation time period relative to before the rotation start-stop function is started.
As an example, the evaluation unit multiplies the accumulated time of all the power values in each power value interval in the evaluation time period by the median of each power value interval, and multiplies the power boost rate corresponding to each power value interval to obtain the power generation amount boost value corresponding to each power value interval, and then adds up the power generation amount boost values corresponding to each power value interval to obtain the boosted power generation amount.
According to the power generation lifting test system and method of the modular wind power converter, the plurality of parallel converter modules are divided into two independent parts through the direct current switches, one part is started to start the alternate start-stop function while the other part is not started to start the alternate start-stop function during testing, and the power lifting rate caused by the fact that the converter modules adopt the alternate start-stop strategy can be accurately determined according to the difference of the generated energy of the two parts.
In addition, according to the power increasing rate and wind resource data obtained by evaluation before site selection of the wind generating set, the power generation amount increasing value caused by the adoption of the alternate start-stop strategy can be accurately calculated, and a more accurate and reliable quantitative analysis result can be provided for a wind power operator.
The invention also provides, according to an embodiment of the invention, a computer-readable storage medium having stored therein a computer program which, when executed, implements a method as described above.
Furthermore, it should be understood that the respective units in the device according to the exemplary embodiment of the present invention may be implemented as hardware components and/or software components. Those skilled in the art may implement the respective units, for example, using a field Programmable Logic Controller (PLC), using a Field Programmable Gate Array (FPGA), or an Application Specific Integrated Circuit (ASIC), according to the processes performed by the respective units as defined.
Further, the method according to the exemplary embodiment of the present invention may be implemented as a computer program in a computer-readable recording medium. The computer program may be implemented by a person skilled in the art from the description of the method described above. The above-described method of the present invention is implemented when the computer program is executed in a computer.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (15)
1. The utility model provides a power generation of modularization wind power converter promotes test system, its characterized in that, modularization wind power converter includes a plurality of parallelly connected conversion modules, and the direct current of all conversion modules converges through direct current busbar, wherein, power generation promotes test system includes: a direct current switch, a first direct current voltage detection device, a second direct current voltage detection device, a first electric quantity metering device and a second electric quantity metering device,
the direct current switch is arranged on a direct current bus bar between the first current converting module group and the second current converting module group, and divides the direct current bus bar into a first direct current bus bar and a second direct current bus bar;
the first direct-current voltage detection device and the second direct-current voltage detection device are respectively arranged on the first direct-current bus bar and the second direct-current bus bar;
the first electric quantity metering device and the second electric quantity metering device are respectively arranged on a first alternating current bus bar and a second alternating current bus bar and are respectively used for measuring the electric energy generation of the first converting module group and the second converting module group, wherein the grid side alternating current of the first converting module group is converged through the first alternating current bus bar, and the grid side alternating current of the second converting module group is converged through the second alternating current bus bar.
2. The power generation boost test system of claim 1, where the first set of converter modules includes a first number of converter modules equal to the second number of converter modules included in the second set of converter modules.
3. The power generation lifting test system according to claim 2, wherein the wind power generator connected with the modular wind power converter is a single-winding wind power generator, wherein a three-phase current output end of the single-winding wind power generator is respectively connected with a three-phase current input end of each of the plurality of parallel converter modules, and a three-phase current output end of each of the plurality of parallel converter modules is connected with a three-phase current input end of the isolation transformer.
4. The power generation lifting test system according to claim 2, wherein the wind power generator connected with the modularized wind power converter is a double-winding wind power generator, wherein a three-phase current output end of one set of three-phase winding of the double-winding wind power generator is respectively connected with a three-phase current input end of each converter module in the first converter module group, a three-phase current output end of the other set of three-phase winding of the double-winding wind power generator is respectively connected with a three-phase current input end of each converter module in the second converter module group, and a three-phase current output end of each converter module in the plurality of parallel converter modules is connected with a three-phase current input end of the isolation transformer.
5. A power generation lifting test method of a modularized wind power converter is characterized by comprising the following steps:
controlling a wind generating set to perform test power generation, wherein a first converter module group or a second converter module group is started to rotate to start and stop, and a machine side torque given value of the first converter module group and a machine side torque given value of the second converter module group are determined according to a first number of converter modules included in the first converter module group and a second number of converter modules included in the second converter module group;
acquiring power data of a wind generating set within the preset time interval at intervals of preset time, and acquiring a first generating capacity of the first current converting module group within the preset time interval and a second generating capacity of the second current converting module group within the preset time interval;
and determining a power boost rate corresponding to each power value interval according to power data, a first power generation amount and a second power generation amount in a preset number of preset time intervals, wherein each power value interval is a power value interval formed by equally dividing a power range capable of being output by the wind generating set according to a certain power interval, and the power boost rate is a percentage of the power output by the wind generating set after the rotation start-stop function is started by the plurality of parallel converter modules and is relative to the power output by the wind generating set before the rotation start-stop function is started.
6. The power generation lifting test method according to claim 5, wherein the first converter module group and the second converter module group are alternately turned on to start and stop the rotation at predetermined time intervals.
7. The power generation lifting test method according to claim 5, wherein the machine side torque given value of the first converter module group is obtained by multiplying a total machine torque given value by a ratio of a first number to a total number, and the machine side torque given value of the second converter module group is obtained by multiplying a total machine torque given value by a ratio of a second number to the total number, wherein the total number is a sum of the first number and the second number, and the total machine torque given value is a torque given value of the wind generating set.
8. The power generation boost test method of claim 5, in which the first number is equal to the second number, the power data over the predetermined time interval includes power values at respective times over the predetermined time interval, the predetermined number is greater than or equal to the number of power value intervals,
and determining the power boost rate corresponding to each power value interval according to the accumulated time of all power values in each power value interval in each preset time interval, the power generation amount of the current conversion module group with the switched start-stop function in each preset time interval and the power generation amount of the current conversion module group with the switched start-stop function in each preset time interval.
9. The power generation boost test method of claim 5, further comprising:
acquiring wind resource data of the position of the wind generating set in an evaluation time period;
and determining the generated energy which is increased after the wind generating set starts the rotation start-stop function in the evaluation time period relative to the generated energy which is increased before the rotation start-stop function is started according to the wind resource data and the power increasing rate corresponding to each power value interval.
10. The utility model provides a power generation of modularization wind power converter promotes test equipment which characterized in that includes:
the test power generation control unit is used for controlling the wind generating set to perform test power generation, wherein a first converter module group or a second converter module group is started to rotate to start and stop, and a machine side torque given value of the first converter module group and a machine side torque given value of the second converter module group are determined according to a first number of converter modules included in the first converter module group and a second number of converter modules included in the second converter module group;
the acquiring unit is used for acquiring power data of the wind generating set within a preset time interval at intervals of preset time, and acquiring a first generating capacity of the first current converting module group within the preset time interval and a second generating capacity of the second current converting module group within the preset time interval;
the determining unit determines a power boost rate corresponding to each power value interval according to power data, a first power generation amount and a second power generation amount in a preset number of preset time intervals, wherein each power value interval is a power value interval formed by equally dividing a power range capable of being output by the wind generating set according to a certain power interval, and the power boost rate is a power boost percentage of power output by the wind generating set after the plurality of parallel converter modules start the rotation start-stop function relative to power output by the wind generating set before the rotation start-stop function is started.
11. The power generation lifting test device according to claim 10, wherein the test power generation control unit controls the first converter module group and the second converter module group to alternately start a rotation start-stop function at predetermined time intervals.
12. The power generation lifting test equipment of claim 10, wherein the machine side torque given value of the first converter module group is a ratio of a first number to a total number multiplied by a total machine torque given value, the machine side torque given value of the second converter module group is a ratio of a second number to the total number multiplied by a total machine torque given value, wherein the total number is a sum of the first number and the second number, and the total machine torque given value is a torque given value of the wind generating set.
13. The power generation boost test device of claim 10, in which the first number is equal to the second number, the power data over the predetermined time interval includes power values at respective times over the predetermined time interval, the predetermined number is greater than or equal to the number of power value intervals,
the determining unit determines the power boost rate corresponding to each power value interval according to the accumulated time of all power values in each power value interval in each preset time interval, the power generation amount of the converter module group with the switched start-stop function in each preset time interval and the power generation amount of the converter module group without the switched start-stop function in each preset time interval.
14. The power generation lift test apparatus of claim 10, further comprising: the evaluation unit is used for acquiring wind resource data of the position of the wind generating set in an evaluation time period; and determining the generated energy which is increased after the wind generating set starts the rotation start-stop function in the evaluation time period relative to the generated energy which is increased before the rotation start-stop function is started according to the wind resource data and the power increasing rate corresponding to each power value interval.
15. A computer-readable storage medium having stored therein a computer program which, when executed, implements the method of any of claims 5 to 9.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010037388A1 (en) * | 2008-09-30 | 2010-04-08 | Vestas Wind System A/S | Logical scheme for severe fault detection |
| CN102621501A (en) * | 2012-03-20 | 2012-08-01 | 天津电气传动设计研究所 | System and method for testing temperature rise and efficiency under rated power of high-power photovoltaic inverter |
| CN103178544A (en) * | 2013-03-15 | 2013-06-26 | 特变电工新疆新能源股份有限公司 | Start and stop control method for parallelly-connected multi-unit photovoltaic grid-connected inverter system |
| CN106814265A (en) * | 2015-11-27 | 2017-06-09 | 中国电力科学研究院 | A kind of photovoltaic DC-to-AC converter generating efficiency test system |
| CN106856331A (en) * | 2015-12-09 | 2017-06-16 | 中国电力科学研究院 | A kind of grid-connected performance test methods of wind-light combined power generation system |
| CN108448909A (en) * | 2018-03-30 | 2018-08-24 | 北京天诚同创电气有限公司 | Modularized current transformer and its control method, wind power generating set |
-
2018
- 2018-09-30 CN CN201811159147.XA patent/CN109358244B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010037388A1 (en) * | 2008-09-30 | 2010-04-08 | Vestas Wind System A/S | Logical scheme for severe fault detection |
| CN102621501A (en) * | 2012-03-20 | 2012-08-01 | 天津电气传动设计研究所 | System and method for testing temperature rise and efficiency under rated power of high-power photovoltaic inverter |
| CN103178544A (en) * | 2013-03-15 | 2013-06-26 | 特变电工新疆新能源股份有限公司 | Start and stop control method for parallelly-connected multi-unit photovoltaic grid-connected inverter system |
| CN106814265A (en) * | 2015-11-27 | 2017-06-09 | 中国电力科学研究院 | A kind of photovoltaic DC-to-AC converter generating efficiency test system |
| CN106856331A (en) * | 2015-12-09 | 2017-06-16 | 中国电力科学研究院 | A kind of grid-connected performance test methods of wind-light combined power generation system |
| CN108448909A (en) * | 2018-03-30 | 2018-08-24 | 北京天诚同创电气有限公司 | Modularized current transformer and its control method, wind power generating set |
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