CN117955166A - Grid construction control method of wind power converter and wind power converter system - Google Patents
Grid construction control method of wind power converter and wind power converter system Download PDFInfo
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Abstract
The application provides a net construction control method of a wind power converter and a wind power converter system. The wind power converter comprises a machine side converter and a grid side converter which are connected in parallel on a direct current side, and the grid side converter comprises an alternating current filter. The machine side converter keeps the conventional alternating current control strategy unchanged, and the network side converter simultaneously controls the direct current voltage and the alternating current voltage. The grid-side converter outputs a direct-current voltage control loop as a grid-side current d-axis positive sequence component target value, and performs closed-loop control on the capacitor branch voltage and current of the alternating-current filter and the positive and negative sequence components of the grid-side current by using a positive and negative sequence voltage respectively directional vector control method. And correcting the side current command value by using the capacitor branch voltage and the direct-current voltage amplitude control loop of the alternating-current filter, and balancing the power transmission between the side and the network side. The wind mechanism network is realized by modifying the network side control algorithm, can continuously run under unbalanced network side, and improves the power grid supporting capacity of the fan.
Description
Technical Field
The application relates to the technical field of power electronic current transformation, in particular to a control method for wind power converter networking and a wind power converter system.
Background
Wind power generation is one of the most promising renewable energy types at present, and has become a third largest power source except thermal power and hydropower in China. The large-scale wind power base in China is usually located in areas with rich wind power resources and a large electrical distance from a main power grid due to the limitation of resource endowment, a weak power grid-connected environment is easy to form, and the operation working condition brings serious challenges to the safe and stable operation of the system.
The traditional control method of the wind power converter is a current source and grid type control mode, and the method has limited capability in the aspects of stable operation in a weak power grid and construction and support of the power grid, and cannot meet the requirements of a novel power system on new energy in the future. In view of this, the voltage source wind power converter grid-formation control technology which takes the simulation of the grid-connection and operation characteristics of the synchronous generator as the main characteristics is widely focused. The wind power converter generally adopts a back-to-back AC-DC-AC topological structure, and in a traditional control algorithm architecture, the grid-side converter controls direct current voltage, and the machine-side converter receives an instruction issued by a fan main control to realize maximum wind energy tracking control (Maximum Power Point Tracking control, MPPT). The existing wind power converter grid formation control strategy is that the grid side converter has the functions of grid formation and support, direct current voltage needs to be controlled by the machine side converter, and a part of fan main control functions are lowered into a control algorithm of the grid side converter, so that the existing wind power converter control algorithm framework needs to be greatly adjusted, and the existing wind power generation set is not beneficial to upgrading and reforming the grid formation control algorithm.
In view of the above, a new wind power converter grid formation control method is needed, which realizes the grid formation function on the premise of keeping the original control algorithm framework to a large extent, improves the power grid supporting capability of the wind power converter, and is convenient for upgrading and reforming the existing wind power generation set.
The above information disclosed in the background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to solve the problems, the application provides a grid construction control method of a wind power converter and a wind power converter system.
According to a first aspect of the present application, at least one embodiment of the present application provides a grid-formation control method for a wind power converter, the wind power converter including a control device, a machine side converter with dc sides connected in parallel, and a grid side converter, an ac terminal of the grid side converter being connected to a common connection point, the grid side converter including an ac filter, wherein the grid-formation control method is used for the control device, the grid-formation control method includes:
generating a network side reference voltage value according to the direct current voltage of the network side converter, the network side current of the network side converter, and the command value and the actual value of the voltage and the current of the capacitance branch of the alternating current filter;
And generating a q-axis current correction quantity instruction value of the machine side converter according to the direct current voltage amplitude of the network side converter and the positive sequence voltage amplitude of the capacitor branch circuit of the alternating current filter, and balancing active power transmission between the machine side converter and the network side converter.
According to a second aspect of the present application, at least one embodiment of the present application provides a wind power converter employing a back-to-back architecture of AC/DC and DC/AC, the wind power converter comprising: a machine side converter and a network side converter connected in parallel on a direct current side, wherein the network side converter comprises an alternating current filter; the alternating current end of the network side converter is connected to the public connection point; the control means is arranged to perform the method according to the first aspect to build or support a voltage at a common connection point, balancing active power transfer between the machine side converter and the grid side converter.
According to a third aspect of the application, at least one embodiment of the application provides a wind power converter system comprising at least two wind power converters according to the second aspect, wherein:
The alternating current ends of the grid-side converters of the at least two wind power converters are connected in parallel with the public connection point to supply power to the power grid unit and the load unit;
And under the condition that the at least two wind power converters are operated, determining a voltage instruction value of a capacitor branch of an alternating current filter in the operated wind power converters through droop control or a virtual synchronous machine algorithm so as to ensure that each wind power converter outputs power to the power grid unit or the load unit according to the capacity proportion.
For example, in some embodiments of the present application, the generating the network-side reference voltage value according to the direct current voltage of the network-side converter, the network-side current of the network-side converter, the voltage and the current of the capacitor branch of the ac filter, and the command value and the actual value includes:
Collecting the voltage and current of a capacitor branch of the alternating current filter and the network side current and direct current of the network side converter;
extracting positive and negative sequence components of the voltage of the capacitance branch of the alternating current filter, the current of the capacitance branch of the alternating current filter and the network side current;
And generating a network side reference voltage value according to the direct current voltage, the positive and negative sequence components of the network side current, the positive and negative sequence components of the capacitor branch voltage of the alternating current filter and the instruction value and the actual value of the positive and negative sequence components of the capacitor branch current of the alternating current filter.
For example, in some embodiments of the present application, the generating the network side reference voltage value according to the direct current voltage of the network side converter, the positive and negative sequence components of the network side current, the positive and negative sequence components of the branch voltage of the ac filter capacitor, and the command value and the actual value of the positive and negative sequence components of the capacitor branch current of the ac filter includes:
adjusting the difference between a target value and an actual value of the direct current voltage of the grid-side converter to obtain a first output value;
Setting the command value of the d-axis positive sequence component in the positive and negative sequence components of the grid-side current as the first output value, setting the command value of the q-axis positive sequence component in the positive and negative sequence components of the grid-side current as the actual value of the q-axis positive sequence component in the positive and negative sequence components of the grid-side current, and setting the command value of the d-axis negative sequence component and the command value of the q-axis negative sequence component in the positive and negative sequence components of the grid-side current as zero respectively;
setting the command value of a d-axis negative sequence component and the command value of a q-axis negative sequence component in positive and negative sequence components of capacitor branch voltage of the alternating current filter to be zero respectively;
Adjusting the difference between the command value of the d-axis positive sequence component, the command value of the q-axis positive sequence component, the command value of the d-axis negative sequence component and the command value of the q-axis negative sequence component in the positive and negative sequence components of the grid-side current and the positive and negative sequence components of the grid-side current dq axis to generate a second output value;
Adjusting the command value of a d-axis positive sequence component, the command value of a q-axis positive sequence component, the command value of a d-axis negative sequence component and the difference between the command value of the q-axis negative sequence component and the positive and negative sequence components of the capacitor branch voltage dq axis of the alternating current filter, wherein the output value is used as a capacitor branch current target value of the alternating current filter, and the difference between the capacitor branch current target value of the alternating current filter and the positive and negative sequence components of the capacitor branch current dq axis of the alternating current filter is adjusted to generate a third output value;
and processing the second output value and the third output value to generate the network side reference voltage value.
For example, in some embodiments of the application, further comprising:
assigning the command value of the d-axis positive sequence component and the command value of the q-axis positive sequence component in the positive sequence components of the capacitor branch voltage of the alternating current filter according to working conditions; or alternatively
The command value of the d-axis positive sequence component and the command value of the q-axis positive sequence component in the positive sequence component and the negative sequence component of the capacitor branch voltage of the alternating current filter are generated through at least one of closed loop control, droop control and virtual synchronous machine algorithm.
For example, in some embodiments of the application, there are:
forward rotating the dq coordinate system and reverse rotating the dq coordinate system at the voltage angular frequency of the common connection point;
controlling positive sequence components of the positive sequence components and the negative sequence components of the net side current in a dq coordinate system rotating in the forward direction, and controlling negative sequence components of the positive sequence components and the negative sequence components of the net side current in a dq coordinate system rotating in the reverse direction, so as to generate the second output value;
And controlling positive sequence components in positive and negative sequence components of the capacitor branch voltage of the alternating current filter and positive sequence components in positive and negative sequence component command values of the capacitor branch current of the alternating current filter in a dq coordinate system rotating in the forward direction, and controlling negative sequence components in positive and negative sequence components of the capacitor branch voltage of the alternating current filter and negative sequence components in positive and negative sequence component command values of the capacitor branch current of the alternating current filter in a dq coordinate system rotating in the reverse direction, so as to generate the third output value.
For example, in some embodiments of the application, the voltage angular frequency is a fixed value, or is generated by droop control and/or virtual synchro-machine algorithms.
For example, in some embodiments of the present application, the processing the second output value and the third output value to generate the network side reference voltage value includes:
summing the d-axis component in the positive sequence component in the second output value and the third output value to obtain a fourth output value;
summing the q-axis components in the positive sequence components in the second output value and the third output value to obtain a fifth output value;
summing the d-axis component in the negative sequence component in the second output value and the third output value to obtain a sixth output value;
Summing the q-axis component in the negative sequence component in the second output value and the third output value to obtain a seventh output value;
converting the fourth and fifth output values into positive sequence components based on a two-phase stationary αβ coordinate system by a forward reverse rotation coordinate transformation, and converting the sixth and seventh output values into negative sequence components based on a two-phase stationary αβ coordinate system by a reverse rotation coordinate transformation;
and adding positive and negative sequence components of the alpha axis and positive and negative sequence components of the beta axis to obtain the network side reference voltage value.
For example, in some embodiments of the application, further comprising:
Generating a side reference voltage alpha beta axis component according to the q axis current correction quantity command value of the side converter, the command value and the actual value of the dq axis current of the alternating current of the side converter;
the machine side converter drive control signal is generated from the machine side reference voltage alpha beta axis component to control the machine side converter.
For example, in some embodiments of the present application, a machine side converter of the wind power converter is connected to a generator, and the generating a machine side reference voltage αβ axis component according to a q axis current correction amount command value of the machine side converter and a command value and an actual value of dq axis current of alternating current of the machine side converter includes:
Collecting alternating current of the machine side converter;
extracting a rotor position electrical angle value of the generator;
Extracting command values and actual values of d-axis current and q-axis current of alternating current of the machine side converter based on the rotor position electric angle value;
and generating the machine side reference voltage alpha beta axis component according to the q axis current correction quantity command value, the actual value of d axis current, the d axis current command value, the actual value of q axis current and the q axis current command value of the alternating current of the machine side converter.
For example, in some embodiments of the application, the machine side converter or the grid side converter comprises a voltage source converter of a two-level topology or a voltage source converter of a three-level topology.
For example, in some embodiments of the application, the ac filter comprises an LC filter, an LCL filter, or an LC filter and transformer connected in series.
For example, in some embodiments of the application, the wind power converter builds or supports the voltage of the common connection point by controlling the capacitive branch voltage of the ac filter of the grid-side converter.
Through the above example embodiment, according to the grid-formation control method of the wind power converter, the machine side converter keeps the original control framework unchanged, the grid side converter simultaneously controls the alternating current voltage and the direct current voltage, adjustment of the existing control framework is reduced to the greatest extent, and popularization and application are facilitated, and the grid-formation function of the existing wind power unit is updated and improved.
Through the above example embodiment, the grid-formation control method of the wind power converter provided by the application adopts the positive and negative sequence voltage respectively directional vector control method on the grid-side converter, so that unbalance of a three-phase alternating current system can be effectively solved, and the power grid adaptability and continuous operation capability of the wind power converter are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are only some of the embodiments of the present application and are not intended to limit the present application.
FIG. 1 illustrates a schematic diagram of a method of controlling a grid formation of a wind power converter in accordance with an exemplary embodiment;
fig. 2 shows a control method of a machine side converter of an exemplary embodiment;
Fig. 3 illustrates a control method of the network-side converter according to an exemplary embodiment;
Fig. 4A shows a schematic diagram of a current transformer of an exemplary embodiment;
Fig. 4B shows a further embodiment of an exemplary current transformer schematic;
FIG. 5A shows a schematic diagram of an AC filter architecture of an exemplary embodiment;
FIG. 5B illustrates yet another embodiment of an exemplary AC filter architecture schematic;
FIG. 5C illustrates yet another embodiment of an exemplary AC filter architecture schematic;
FIG. 6A illustrates a positive sequence component instruction value fetch method schematic diagram of an exemplary embodiment;
FIG. 6B illustrates yet another embodiment of an exemplary positive sequence component instruction value fetch method schematic;
FIG. 7A illustrates a schematic diagram of a closed loop control architecture of an exemplary embodiment;
FIG. 7B illustrates yet another embodiment of an exemplary closed loop control architecture diagram;
FIG. 7C illustrates yet another embodiment of an exemplary closed loop control architecture schematic;
FIG. 7D illustrates yet another embodiment of an exemplary closed loop control architecture diagram;
FIG. 7E illustrates yet another embodiment of an exemplary closed loop control architecture diagram;
FIG. 7F illustrates yet another embodiment of an exemplary closed loop control architecture diagram;
FIG. 8 is a schematic diagram of an exemplary embodiment of a method for generating an AC side voltage reference;
FIG. 9 illustrates a schematic diagram of a wind power converter system in accordance with an exemplary embodiment;
Fig. 10 is a schematic waveform diagram of an exemplary embodiment of a wind power converter networking control method according to the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the disclosed aspects may be practiced without one or more of the specific details, or with other methods, components, materials, apparatus, etc. In these instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Those skilled in the art will appreciate that the drawings are schematic representations of example embodiments and that the modules or flows in the drawings are not necessarily required to practice the application and therefore should not be taken to limit the scope of the application.
Fig. 1 shows a schematic diagram of a grid-formation control method of a wind power converter according to an exemplary embodiment.
Referring to fig. 1, the wind power converter adopts an AC/dc+dc/AC back-to-back structure, and includes a machine side converter 20, a grid side converter 30 and a control device 50. The ac terminals of the grid-side converter 30 are connected to the common connection point. The grid-side converter 30 includes an ac filter 40. The wind power converter is connected to the stator-side windings of the generator 10 via a machine-side converter 20. The dc positive and negative poles of the machine-side converter 20 are connected to the dc positive and negative poles of the grid-side converter 30, respectively. The grid-side converter 30 is connected to the grid unit and the load unit via an ac filter 40 at the PCC point.
The control device 50 is used for executing a multi-objective control method of the wind power converter system to build or support the voltage of the common point PCC point, balancing the active power transfer between the machine side converter 20 and the grid side converter 30.
According to some embodiments, as shown in fig. 1, the wind power converter grid formation control method includes controlling a machine side converter and controlling a grid side converter.
As shown in fig. 2, the machine side converter control scheme is consistent with the machine side control scheme of the conventional wind power converter, and the d-axis current i d、iq and the q-axis current i d、iq of the generator are respectively controlled by utilizing rotor position orientation vector control under the dq coordinate system to generate a machine side reference voltage vectorAnd/>The method for controlling the machine side converter comprises the following steps:
in step S101, an ac current i abc of the collector-side converter is acquired.
In step S102, the rotor position electrical angle θ r of the generator is extracted by an encoder or a parameter identification algorithm.
In step S103, based on the rotor position electric angle value θ r, the d-axis current actual value i d and the d-axis current command value of the dq-axis component of the ac current i abc of the generator-side converter are extracted by Park coordinate conversionQ-axis current actual value i q and q-axis current command value/>
In step S104, a q-axis current correction amount command value of the side converter is generated according to the dc voltage amplitude of the grid side converter and the positive sequence voltage of the filter capacitor branch; the machine side reference voltage alpha beta axis component is generated according to the q axis current correction amount command value of the machine side converter and the command value and actual value of the d axis current and q axis current of the alternating current of the machine side converter.
According to an example embodiment, the grid-side converter simultaneously controls the direct current voltage and the alternating current voltage of the grid-side converter, wherein the method for controlling the direct current voltage is as follows: collecting DC voltage amplitude of grid-side converterAnd filter capacitor branch voltage amplitude/>DC voltage amplitude/>, of control network side converterThe difference from the actual value u dc of the DC voltage is passed through the PI controller to generate the first result value. Positive sequence voltage amplitude/>, of filter capacitor branchThe difference from the positive sequence voltage actual value u camp is passed through the PI controller to produce a second resultant value. The first result value and the second result value are summed to generate a q-axis current correction amount command value/>, of the side converterTo balance active power transfer between the machine side converter and the grid side converter. According to some embodiments, the positive sequence voltage amplitude/>, of the capacitive branch of the ac filterThe calculation method is as follows:
The positive sequence voltage u camp of the filter capacitor branch circuit is calculated by the following steps:
Wherein u cdp、ucqp is the d-axis and q-axis positive sequence components of the capacitor branch voltage of the ac filter, The d-axis positive sequence component command value and the q-axis positive sequence component command value of the capacitor branch voltage of the alternating current filter.
According to some embodiments, the d-axis positive sequence component instruction value and the q-axis positive sequence component instruction value of the filter capacitor branch voltage are obtained through active power and reactive power output by the wind power converter, as shown in fig. 6A and fig. 6B, and the method comprises the following steps:
and collecting active power P and reactive power Q of the wind power converter.
According to the active power P and the reactive power Q, outputting a voltage phase angle command value delta * of a capacitor branch of the alternating current filter and a positive sequence voltage amplitude of the capacitor branch of the alternating current filter
As shown in fig. 6A, the difference between the active power amplitude P * and the active power P is controlled to obtain a phase angle command value δ * through the PI controller. The difference between the reactive power amplitude Q * and the reactive power Q passes through a PI controller to obtain the positive sequence voltage amplitude of the filter capacitor branch
As shown in fig. 6B, the droop control algorithm is used to adjust the difference between the active power amplitude P * and the active power P to obtain the phase angle command value δ *. The droop control algorithm is used for adjusting the difference between the reactive power amplitude Q * and the reactive power Q, and the output value is added with the positive sequence voltage set value u camp_set of the capacitor branch of the alternating current filter to obtain the positive sequence voltage amplitude of the capacitor branch of the alternating current filter
Based on the voltage phase angle command value delta * and the positive sequence voltage amplitude of the capacitor branch of the AC filterObtaining the command value/>, of the d-axis positive sequence component in the positive and negative sequence components of the capacitor branch voltage of the alternating current filter through trigonometric function calculationAnd the instruction value of the q-axis positive sequence component/>
According to some embodiments, the maximum wind energy capture control (Maximum Power Point Tracking control, MPPT) function and the reactive distribution function of the wind power converter in fig. 6A and 6B are both implemented by the fan master.
According to some embodiments, the MPPT algorithm obtains the machine side converter q-axis current target value byRealizing q-axis current target value/>The wind power converter is issued by a fan main control and is consistent with the control scheme of the traditional wind power converter.
According to some embodiments, the voltage phase angle command value delta * of the capacitive branch of the ac filter and the positive sequence voltage amplitude of the capacitive branch of the ac filterIt can be set by oneself, the application takes the above algorithm to obtain as an example, but the application is not limited to this.
Control of q-axis current correction amount command valueAnd q-axis current command value/>The sum q-axis current i q passes through the rotor module directional vector control module to obtain the machine side reference voltage q-axis component/>Control d-axis current command value/>The d-axis current i d passes through the rotor module directional vector control module to obtain a machine side reference voltage d-axis component/>
Controller side reference voltage q-axis componentSide reference voltage d-axis component/>And rotor position electrical angle value theta r, converting into a two-phase stationary alpha beta coordinate system through forward and reverse rotation coordinate transformation, and generating a machine side reference voltage alpha beta axis component/>
In step S105, a side converter drive control signal is generated from the side reference voltage αβ axis component to control the side converter.
According to an exemplary embodiment, the machine side reference voltage alpha beta axis component is made by a PWM modulation algorithmAnd generating a driving control signal of the machine side converter to control the machine side converter, and realizing active power balance in the wind power converter by adjusting the output power of the machine side converter so as to stabilize the direct current voltage.
As shown in fig. 3, the method for controlling the network-side converter is as follows: under the dq coordinate system, taking direct current voltage u dc and the positive sequence component of the capacitor branch voltage dq axis of the alternating current filter as control targets to generate a network side reference voltage valueAnd/>The method for controlling the network-side converter comprises the following steps:
In step S201, the capacitor leg voltage u cabc of the ac filter, the capacitor leg current i fabc of the ac filter, the net side current i 2abc of the net side converter, and the dc voltage u dc are acquired.
According to an example embodiment, the grid-side converter simultaneously controls the direct current voltage and the alternating current voltage, wherein the method for controlling the alternating current voltage is as follows: the capacitor branch voltage u cabc of the alternating current filter, the capacitor branch current i fabc of the alternating current filter, the network side current i 2abc and the direct current voltage u dc are collected.
In step S202, the common junction voltage angular frequency is integrated to obtain the grid voltage phase angle.
According to an example embodiment, the common point voltage angular frequency ω 0 is integrated with a pure integration step to generate the grid voltage phase angle θ.
In step S203, positive and negative sequence components of the voltage of the capacitor branch of the ac filter, the current of the capacitor branch of the ac filter, and the grid-side current are extracted.
According to an exemplary embodiment, the positive and negative sequence components of the dq axis of the capacitor leg voltage u cabc, the current i fabc and the net side current i 2abc of the ac filter are extracted by a positive and negative sequence decomposition algorithm in combination with Park coordinate transformation, resulting in the dq axis positive and negative sequence components u cdp、ucqp、ucdn and u cqn of the capacitor leg voltage u cabc of the ac filter, the dq axis positive and negative sequence components i fdp、ifqp、ifdn and i fqn of the capacitor leg current i fabc of the ac filter, and the dq axis positive and negative sequence components i 2dp、i2qp、i2dn and i 2qn of the net side current i 2abc.
In step S204, the direct current voltage u dc, the positive and negative sequence components i 2dp、i2qp、i2dn and i 2qn of the network side current, the positive and negative sequence components u cdp、ucqp、ucdn and u cqn of the capacitor branch voltage of the AC filter, the positive and negative sequence components i fdp、ifqp、ifdn and i fqn of the capacitor branch current of the AC filter are controlled to generate the network side reference voltage valueAnd/>
According to an example embodiment, a DC voltage target value is controlledThe difference between the current value and the actual value u dc of the direct current voltage passes through a PI controller to obtain a first output value, and the first output value is used as the instruction value/>, of d-axis positive sequence components in positive and negative sequence components of the grid-side currentSetting an actual value i 2qp of the q-axis positive sequence component in the positive and negative sequence components of the grid-side current as a command value/>, of the q-axis positive sequence component in the positive and negative sequence components of the grid-side currentSetting the instruction value/>, of d-axis negative sequence component in positive and negative sequence components of network side currentAnd the instruction value of the q-axis negative sequence component/>Zero.
The command values of positive and negative sequence components of the network side current are respectively directed by the vector control module by using positive and negative sequence voltagesAnd/>Control the difference between the positive and negative sequence components i 2dp、i2qp、i2dn and i 2qn of the network side current to obtain a second output value/>And/>
The positive and negative sequence voltages are used for respectively directing the positive and negative sequence component instruction values of the capacitor branch voltage of the alternating current filter by the vector control moduleAnd/>Control the difference between the positive and negative sequence components u cdp、ucqp、ucdn and u cqn of the capacitor branch voltage of the AC filter, and the output value is used as the target value of the positive and negative sequence components of the capacitor branch current of the AC filterAnd/>
Command value of d-axis negative sequence component in positive and negative sequence component command value of capacitor branch voltage of alternating current filterAnd the instruction value of the q-axis negative sequence component/>Set to zero. Command value/>, of d-axis positive sequence component in positive and negative sequence component command values of capacitor branch voltage of alternating current filterAnd the instruction value of the q-axis positive sequence component/>And carrying out assignment according to specific working conditions.
According to some embodiments, the command value of the d-axis positive sequence component and the command value of the q-axis positive sequence component in the positive and negative sequence components of the capacitor leg voltage of the ac filter are assigned according to a working condition, or the command value of the d-axis positive sequence component and the command value of the q-axis positive and negative sequence component in the positive and negative sequence components of the capacitor leg voltage of the filter are generated by at least one of closed loop control, droop control and a virtual synchronous machine algorithm.
The vector control module is respectively oriented to target values of dq axis positive and negative sequence components of capacitor branch current of the alternating current filter by using positive and negative sequence voltagesAnd/>The difference between the dq axis positive and negative sequence components i fdp、ifqp、ifdn and i fqn of the capacitor branch current of the alternating current filter is controlled to obtain a third output value/>And/>
Using the reference voltage vector calculation module to calculate a second output valueAnd/>Third output value/>And/>Control is carried out to generate a network side reference voltage value/>And/>
According to some embodiments, the control method for the grid-side converter uses a positive and negative sequence voltage respectively-oriented vector control method to respectively perform closed-loop control on the dq-axis positive and negative sequence components of the filter capacitor branch voltage, the dq-axis positive and negative sequence components of the current and the dq-axis positive and negative sequence components of the grid-side current, and sends the output quantity of the closed-loop control circuit into a reference voltage vector calculation module to generate a grid-side reference voltage valueAnd/>
According to some embodiments, the positive and negative sequence voltage respectively directional vector control method comprises:
Forward rotating dq coordinate system and reverse rotating dq coordinate system with PCC point voltage angular frequency omega 0: controlling a positive sequence component of a controlled object based on a forward rotation dq coordinate system; the negative sequence component of the controlled object is controlled based on the counter-rotating dq coordinate system.
According to some embodiments, the voltage angular frequency of the PCC point may be set to a constant value, such as 100 pi rad/s, or may be set to a time-varying value by an algorithm such as active power droop control, virtual synchronous machine control, or the like.
The embodiment shown in FIG. 7A is a closed loop control structure of the positive sequence components u cdp and u cqp of the voltage of the capacitive branch of the AC filter implemented in the forward rotation dq coordinate system, the final output of the d-axis and q-axis serving as the target value of the positive sequence component of the current of the capacitive branch of the AC filterAnd/>
The embodiment shown in fig. 7B is a closed loop control structure of current positive sequence components i fdp and i fqp of a filter capacitor branch implemented in a forward rotation dq coordinate system, and the final output quantity of d-axis and q-axis is used as correction quantity of net voltage positive sequence component command value of net side converterAnd/>
The embodiment shown in FIG. 7C is a closed loop control structure of the voltage negative sequence components u cdn and u cqn of the capacitive branch of the AC filter implemented in a counter-rotating dq coordinate system, the final output of the d-axis and q-axis acting as the target value of the current negative sequence component of the capacitive branch of the AC filterAnd/>
The embodiment shown in fig. 7D is a closed loop control structure of current negative sequence components i fdn and i fqn of the capacitive branch of the ac filter implemented in a counter-rotating dq coordinate system, the final output quantity of the D-axis and q-axis acting as correction quantity of net voltage negative sequence component command value of net side converterAnd/>
The embodiment shown in fig. 7E is a closed loop control structure for positive sequence components i 2dp and i 2qp of the net side current implemented in a forward rotating dq coordinate system, the final output of the d-axis and q-axis acting as the main part of the net side converter net voltage positive sequence component command valueAnd/>
The embodiment shown in FIG. 7F is a closed loop control structure for the negative sequence components i 2dn and i 2qn of the net side current implemented in a counter-rotating dq coordinate system, the final output of the d-axis and q-axis acting as the main body portion of the net side converter net voltage negative sequence component command valueAnd/>
In the embodiments of fig. 7A-7F, the controllers therein all employ proportional-integral controllers, according to some embodiments. Wherein C f and L 1 are values of the filter capacitance C f and the inductance L 1 in the capacitive branch of the ac filter.
According to an exemplary embodiment, the reference voltage vector calculation module sums the d and q axis components of the positive and negative sequence components of the current control loop output, respectively, and converts them into positive and negative sequence components based on a two-phase stationary alpha beta coordinate system by forward and reverse rotation coordinate transformation, respectively, adds the positive and negative sequence components of the alpha and beta axes, respectively, to generate a grid-side reference voltage valueAnd
As shown in fig. 8, the main part of the net side converter is constructed with the net voltage positive sequence component command valueAnd/>Correction amount/>, of net-side converter net-structured voltage positive sequence component instruction valueAnd/>Respectively adding to obtain the reference value/>, of the voltage dq axis of the alternating-current end at the valve side of the positive sequence network side converterAnd/>Reference value of valve side alternating current end voltage dq axis of positive sequence network side converterAnd/>Generating a positive sequence net side converter valve side alternating current end alpha beta axis reference value/>, based on a two-phase static alpha beta coordinate system, through inverse rotation transformationAnd/>
Main body part for constructing net voltage negative sequence component instruction value of net side converterAnd/>Correction amount/>, of net-side converter net-constructed voltage negative sequence component instruction valueAnd/>Respectively adding to obtain the dq axis reference value/>, of the valve side alternating current end of the negative sequence net side converterAnd/>The dq axis reference value/>, of the valve side alternating current end of the negative sequence net side converterAnd/>Generating a negative sequence net side converter valve side alternating current end alpha beta axis reference value/>, based on a two-phase static alpha beta coordinate system, through inverse rotation transformationAnd
Finally, the alpha axis reference value of the valve side alternating current end of the positive sequence network side converterAnd/>And negative sequence net side converter valve side alternating current end alpha axis reference value/>Adding, and adding a positive sequence network side converter valve side alternating current end beta axis reference value/>And negative sequence net side converter valve side alternating current end beta axis reference value/>Adding to obtain the voltage reference value/>, of the alternating current end at the valve side of the grid-side converterAnd/>
In step S205, a driving control signal of the grid-side converter is generated according to the grid-side reference voltage value to control the grid-side converter.
According to an exemplary embodiment, a driving control signal of the grid-side converter is generated according to the grid-side reference voltage value using a pulse width modulation algorithm to control the grid-side converter.
According to an exemplary embodiment, the present application constructs or supports the PCC voltage u gabc by controlling the capacitive branch voltage u cabc of the ac filter of the grid-side converter.
According to the grid-formation control method of the wind power converter, the machine side converter keeps the original control framework unchanged, the grid side converter simultaneously controls the alternating current voltage and the direct current voltage, adjustment of the existing control framework is reduced to the greatest extent, and popularization and application are facilitated, and grid-formation function upgrading and transformation of an existing wind turbine are facilitated. The grid-side converter adopts a positive and negative sequence voltage respectively directional vector control method, so that unbalance of a three-phase alternating current system can be effectively overcome, and the power grid adaptability and continuous operation capability of the wind power converter are improved.
According to some embodiments, the machine side converter or the grid side converter is a voltage source converter of a two-level topology circuit or a voltage source converter of a three-level topology circuit, respectively.
The embodiment shown in fig. 4A is a two-level converter and the embodiment shown in fig. 4B is a three-level converter based on diode clamping.
According to some embodiments, the valve-side ac end of the grid-side converter 30 is connected to the load cell or grid cell at a point of common connection PCC via a filter capacitor branch 40.
The embodiment shown in fig. 5A-5C is a circuit configuration of an ac filter.
The embodiment shown in fig. 5A is that the ac end of the valve side of the converter is connected to the grid and the load at the PCC point via an LC filter. The embodiment shown in fig. 5B is that the ac side of the converter valve is connected to the grid and the load at the PCC point via an LCL filter. The embodiment shown in fig. 5C is that the ac end of the valve side of the converter is connected to the grid and the load at the PCC point via an LC filter and a transformer L T. The transformer leakage inductance L T acts in concert with the LCL filter grid side reactor L 2, and therefore the LC filter and transformer connection is equivalent to an LCL filter.
Figure 9 illustrates a schematic diagram of a wind power converter system in accordance with an exemplary embodiment.
As shown in fig. 9, the wind power converter system includes at least two wind power converters. The alternating current ends of the wind power converters are connected in parallel with the PCC point, and the power of each wind power converter is output outwards according to the rated capacity proportion by adjusting the voltage of a capacitor branch of an alternating current filter connected with the wind power converter to a target value.
In the embodiment shown in fig. 9, n wind power converter grid-side ac terminals with different or same capacity are all connected in parallel to the PCC point to supply power to the grid unit and the load unit together. When the wind power converter system operates, each wind power converter generates a voltage instruction value of a capacitor branch of each alternating current filter through droop control or a virtual synchronous machine algorithm and the like, so that each wind power converter outputs power to a power grid unit or a load unit according to the capacity proportion, and overload of the small-capacity wind power converter is avoided.
Fig. 10 is a schematic waveform diagram of an exemplary embodiment of a wind power converter networking control method according to the present application.
As shown in fig. 10, PCC three-phase ac voltages Ua and Ub and Uc, converter output active power Pout, ac voltage amplitude command values and actual values Ucref and Ucamp, dc voltage Udc, machine side converter q-axis current command value iqref_pm, and correction amount command value Δiqref_pm are sequentially from top to bottom and from left to right.
When the wind power converter networking control method provided by the application is adopted, the following steps are adopted: at 13s, the pure resistance load of the alternating current side of the wind power converter is stepped from approximately no-load to about 0.2pu, and the three-phase alternating voltage of the PCC point and the direct current voltage of the converter reach the control target value and remain stable after dynamic adjustment.
In the process, the q-axis current command value Iqref_PM of the machine side converter is corrected by the output quantity delta Iqref_PM of the alternating current and direct current voltage amplitude control loop of the converter, so that the adjustment of active power transmitted by the machine side converter and the grid side converter is realized.
At the moment of 16s, the alternating-current voltage amplitude command value is stepped from 1.0pu to 0.8pu, and as the alternating-current side load of the wind power converter is a pure resistance load, the active power Pout output by the grid-side converter is reduced to about 0.13 pu. After dynamic regulation, the PCC point three-phase alternating current voltage, direct current voltage and the like of the converter reach control targets and remain stable, the q-axis current command value Iqref_PM of the machine side converter changes along with delta Iqref_PM in the whole process, and active power transmission between the machine side and the network side is balanced.
It should be clearly understood that the present application describes how to make and use particular examples, but the present application is not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.
Furthermore, it should be noted that the above-described figures are merely illustrative of the processes involved in the method according to the exemplary embodiment of the present application, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules.
The exemplary embodiments of the present application have been particularly shown and described above. It is to be understood that this application is not limited to the precise arrangements, instrumentalities and instrumentalities described herein; on the contrary, the application is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (14)
1. The utility model provides a wind power converter network construction control method, wind power converter includes controlling means and direct current side parallel connection's machine side converter, net side converter's alternating current end is connected in public tie point, net side converter contains alternating current filter, characterized in that, network construction control method is used for controlling means, network construction control method includes:
generating a network side reference voltage value according to the direct current voltage of the network side converter, the network side current of the network side converter, and the command value and the actual value of the voltage and the current of the capacitance branch of the alternating current filter;
And generating a q-axis current correction quantity instruction value of the machine side converter according to the direct current voltage amplitude of the network side converter and the positive sequence voltage amplitude of the capacitor branch circuit of the alternating current filter, and balancing active power transmission between the machine side converter and the network side converter.
2. The network configuration control method according to claim 1, wherein the generating a network side reference voltage value based on the direct current voltage of the network side converter, the network side current of the network side converter, the command value and the actual value of the voltage and the current of the capacitor branch of the ac filter, includes:
Collecting the voltage and current of a capacitor branch of the alternating current filter and the network side current and direct current of the network side converter;
extracting positive and negative sequence components of the voltage of the capacitance branch of the alternating current filter, the current of the capacitance branch of the alternating current filter and the network side current;
And generating a network side reference voltage value according to the direct current voltage, the positive and negative sequence components of the network side current, the positive and negative sequence components of the capacitor branch voltage of the alternating current filter and the instruction value and the actual value of the positive and negative sequence components of the capacitor branch current of the alternating current filter.
3. The network configuration control method according to claim 2, wherein the generating the network side reference voltage value based on the direct current voltage of the network side converter, the positive and negative sequence components of the network side current, the positive and negative sequence components of the branch voltage of the ac filter capacitor, and the command value and the actual value of the positive and negative sequence components of the capacitor branch current of the ac filter includes:
adjusting the difference between a target value and an actual value of the direct current voltage of the grid-side converter to obtain a first output value;
Setting the command value of the d-axis positive sequence component in the positive and negative sequence components of the grid-side current as the first output value, setting the command value of the q-axis positive sequence component in the positive and negative sequence components of the grid-side current as the actual value of the q-axis positive sequence component in the positive and negative sequence components of the grid-side current, and setting the command value of the d-axis negative sequence component and the command value of the q-axis negative sequence component in the positive and negative sequence components of the grid-side current as zero respectively;
setting the command value of a d-axis negative sequence component and the command value of a q-axis negative sequence component in positive and negative sequence components of capacitor branch voltage of the alternating current filter to be zero respectively;
Adjusting the difference between the command value of the d-axis positive sequence component, the command value of the q-axis positive sequence component, the command value of the d-axis negative sequence component and the command value of the q-axis negative sequence component in the positive and negative sequence components of the grid-side current and the positive and negative sequence components of the grid-side current dq axis to generate a second output value;
Adjusting the command value of a d-axis positive sequence component, the command value of a q-axis positive sequence component, the command value of a d-axis negative sequence component and the difference between the command value of the q-axis negative sequence component and the positive and negative sequence components of the capacitor branch voltage dq axis of the alternating current filter, wherein the output value is used as a capacitor branch current target value of the alternating current filter, and the difference between the capacitor branch current target value of the alternating current filter and the positive and negative sequence components of the capacitor branch current dq axis of the alternating current filter is adjusted to generate a third output value;
and processing the second output value and the third output value to generate the network side reference voltage value.
4. The web formation control method according to claim 3, characterized by further comprising:
assigning the command value of the d-axis positive sequence component and the command value of the q-axis positive sequence component in the positive sequence components of the capacitor branch voltage of the alternating current filter according to working conditions; or alternatively
The command value of the d-axis positive sequence component and the command value of the q-axis positive sequence component in the positive sequence component and the negative sequence component of the capacitor branch voltage of the alternating current filter are generated through at least one of closed loop control, droop control and virtual synchronous machine algorithm.
5. A web formation control method according to claim 3, comprising:
forward rotating the dq coordinate system and reverse rotating the dq coordinate system at the voltage angular frequency of the common connection point;
controlling positive sequence components of the positive sequence components and the negative sequence components of the net side current in a dq coordinate system rotating in the forward direction, and controlling negative sequence components of the positive sequence components and the negative sequence components of the net side current in a dq coordinate system rotating in the reverse direction, so as to generate the second output value;
And controlling positive sequence components in positive and negative sequence components of the capacitor branch voltage of the alternating current filter and positive sequence components in positive and negative sequence component command values of the capacitor branch current of the alternating current filter in a dq coordinate system rotating in the forward direction, and controlling negative sequence components in positive and negative sequence components of the capacitor branch voltage of the alternating current filter and negative sequence components in positive and negative sequence component command values of the capacitor branch current of the alternating current filter in a dq coordinate system rotating in the reverse direction, so as to generate the third output value.
6. The method of claim 5, wherein the angular frequency of the voltage is a fixed value or is generated by droop control and/or virtual synchro-machine algorithms.
7. The network configuration control method according to claim 3, wherein the processing the second output value and the third output value to generate the network-side reference voltage value includes:
summing the d-axis component in the positive sequence component in the second output value and the third output value to obtain a fourth output value;
summing the q-axis components in the positive sequence components in the second output value and the third output value to obtain a fifth output value;
summing the d-axis component in the negative sequence component in the second output value and the third output value to obtain a sixth output value;
Summing the q-axis component in the negative sequence component in the second output value and the third output value to obtain a seventh output value;
converting the fourth and fifth output values into positive sequence components based on a two-phase stationary αβ coordinate system by a forward reverse rotation coordinate transformation, and converting the sixth and seventh output values into negative sequence components based on a two-phase stationary αβ coordinate system by a reverse rotation coordinate transformation;
and adding positive and negative sequence components of the alpha axis and positive and negative sequence components of the beta axis to obtain the network side reference voltage value.
8. The web formation control method according to claim 1, characterized by further comprising:
Generating a side reference voltage alpha beta axis component according to the q axis current correction quantity command value of the side converter, the command value and the actual value of the dq axis current of the alternating current of the side converter;
the machine side converter drive control signal is generated from the machine side reference voltage alpha beta axis component to control the machine side converter.
9. The grid formation control method according to claim 8, wherein a machine side converter of the wind power converter is connected to a generator, the generating a machine side reference voltage αβ axis component based on a q axis current correction amount command value of the machine side converter and a command value and an actual value of dq axis current of alternating current of the machine side converter, comprising:
Collecting alternating current of the machine side converter;
extracting a rotor position electrical angle value of the generator;
Extracting command values and actual values of d-axis current and q-axis current of alternating current of the machine side converter based on the rotor position electric angle value;
and generating the machine side reference voltage alpha beta axis component according to the q axis current correction quantity command value, the actual value of d axis current, the d axis current command value, the actual value of q axis current and the q axis current command value of the alternating current of the machine side converter.
10. A wind power converter, the wind power converter employing an AC/DC and DC/AC back-to-back architecture, the wind power converter comprising:
a machine side converter and a network side converter connected in parallel on a direct current side, wherein the network side converter comprises an alternating current filter;
the alternating current end of the network side converter is connected to the public connection point;
control means for performing the method of any of claims 1-9 to build or support a voltage at a common connection point, balancing active power transfer between the machine side converter and the grid side converter.
11. Wind power converter according to claim 10, characterized in that the machine side converter or the grid side converter comprises a voltage source converter of a two-level topology or a voltage source converter of a three-level topology.
12. Wind power converter according to claim 10, characterized in that the ac filter comprises an LC filter, an LCL filter or an LC filter and a transformer connected in series.
13. Wind power converter according to claim 10, characterized in that it builds or supports the voltage of the common connection point by controlling the capacitive branch voltage of the ac filter of the grid side converter.
14. A wind power converter system, characterized in that it comprises at least two wind power converters according to any one of claims 10-13, wherein:
The alternating current ends of the grid-side converters of the at least two wind power converters are connected in parallel with the public connection point to supply power to the power grid unit and the load unit;
And under the condition that the at least two wind power converters are operated, determining a voltage instruction value of a capacitor branch of an alternating current filter in the operated wind power converters through droop control or a virtual synchronous machine algorithm so as to ensure that each wind power converter outputs power to the power grid unit or the load unit according to the capacity proportion.
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