CN108155676B - New energy power generation field harmonic suppression method and device, controller and storage medium - Google Patents
New energy power generation field harmonic suppression method and device, controller and storage medium Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
The embodiment of the invention discloses a method and a device for suppressing harmonic waves of a new energy power generation field, a controller and a storage medium. The method comprises the following steps: acquiring rated power of each generator set of the new energy power plant; determining a reactive power compensation value of each generator set according to the rated power of each generator set; determining reactive power regulating quantity of each generator set according to the rated power of each generator set and the reactive power compensation value of each generator set; and adjusting the reactive power provided by each generator set according to the reactive power adjustment quantity of each generator set so as to enable the power factors of each generator set in operation to be different and suppress the harmonic waves of the new energy power plant. The method, the device, the controller and the storage medium for suppressing the harmonic waves of the new energy power generation field can suppress the harmonic waves of the grid-connected point of the power generation field and reduce the cost; and the harmonic suppression effect can be improved.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a method and a device for suppressing harmonic waves of a new energy power generation field, a controller and a computer readable storage medium.
Background
Harmonics in a power plant are mainly caused by power generation equipment, power transmission and distribution equipment, nonlinear loads of a power system, and the like. The harmonic wave is a component which is obtained by performing Fourier series decomposition on the periodic non-sinusoidal alternating current, wherein the frequency of the component is not the same as the fundamental frequency of the power supply, and is greater than the fundamental frequency.
For a farm, the harmonic current of the farm grid-tie point is the sum of the harmonic currents of all the generator sets. Harmonic currents reduce the efficiency of production, transmission and utilization of electrical energy and adversely affect the operation of the load, and thus need to be suppressed.
At present, the harmonic current of the grid-connected point of a power plant is suppressed, and a filter or a reactive compensation device with a harmonic suppression function is mainly used.
However, suppressing the harmonic current using a filter or a reactive compensation device having a harmonic suppression function may increase additional costs and may be less effective in suppressing harmonics.
Disclosure of Invention
The embodiment of the invention provides a method and a device for suppressing harmonic waves of a new energy power generation field, a controller and a computer readable storage medium, which can suppress harmonic waves of grid-connected points of the power generation field, reduce cost and improve harmonic suppression effect.
On one hand, the embodiment of the invention provides a method for suppressing harmonic waves of a new energy power generation field, which comprises the following steps:
acquiring rated power of each generator set of the new energy power plant;
determining a reactive power compensation value of each generator set according to the rated power of each generator set;
determining reactive power regulating quantity of each generator set according to the rated power of each generator set and the reactive power compensation value of each generator set;
and adjusting the reactive power of each generator set according to the reactive power adjustment quantity of each generator set so as to enable the power factors of each generator set in operation to be different and suppress harmonic waves of the power plant.
In one embodiment of the invention, the determining the reactive power regulating quantity of each generator set according to the rated power of each generator set and the reactive power compensation value of each generator set comprises the following steps:
calculating the sum of the reactive power compensation values of the power plant according to the reactive power compensation value of each generator set;
calculating the sum of rated power of the power generation field according to the rated power of each generator set;
and determining the reactive power regulating quantity of each generator set according to the reactive power compensation value of each generator set, the rated power of each generator set, the sum of the reactive power compensation values and the sum of the rated power.
In one embodiment of the invention, determining the reactive power adjustment amount of each generator set according to the reactive power compensation value of each generator set, the rated power of each generator set, the sum of the reactive power compensation values and the sum of the rated powers comprises the following steps:
for each generator set, taking the quotient of the rated power of the generator set and the sum of the rated power as a first intermediate value;
taking the product of the first intermediate value and the sum of the reactive power compensation values as a second intermediate value;
and determining the difference value of the reactive power compensation value of the generator set and the second intermediate value as the reactive power regulating quantity of the generator set.
In one embodiment of the invention, determining the reactive power compensation value of each generator set according to the rated power of each generator set comprises the following steps:
taking the quotient of the circumference ratio and the harmonic frequency which needs to be suppressed by the power generation field as the maximum power angle of each generator set;
randomly selecting a power angle from a power angle range for each generator set, and determining the product of the rated power of the generator set and the tangent value of the selected power angle as the reactive power compensation value of the generator set, wherein the power angle range is from a negative maximum power angle to a positive maximum power angle.
In one embodiment of the invention, before adjusting the reactive power of each of the gensets in accordance with the reactive power adjustment amount for each genset, the method further comprises:
determining a reactive power regulation coefficient of each generator set according to the maximum reactive power, the minimum reactive power, the current reactive power and the preset harmonic frequency of each generator set;
according to the reactive power regulating variable of each generating set, the reactive power of each generating set is regulated, and the method comprises the following steps:
and adjusting the reactive power of each generator set according to the reactive power adjustment quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power adjustment coefficient of each generator set.
In one embodiment of the invention, adjusting the reactive power of each generator set according to the reactive power adjustment amount of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power adjustment coefficient of each generator set comprises:
calculating the target reactive power of each generator set according to the reactive power regulating quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power regulating coefficient of each generator set;
the reactive power of each genset is adjusted based on the target reactive power of each genset.
On the other hand, the embodiment of the invention provides a device for suppressing new energy farm harmonics, which comprises:
the acquisition module is used for acquiring the rated power of each generator set of the new energy power plant;
the first determining module is used for determining a reactive power compensation value of each generator set according to the rated power of each generator set;
the second determining module is used for determining the reactive power regulating quantity of each generator set according to the rated power of each generator set and the reactive power compensation value of each generator set;
and the adjusting module is used for adjusting the reactive power of each generator set according to the reactive power adjusting quantity of each generator set so as to enable the power factors of each generator set in operation to be different and inhibit the harmonic waves of the power plant.
In one embodiment of the present invention, the second determining module includes:
the first calculation unit is used for calculating the sum of the reactive power compensation values of the power generation field according to the reactive power compensation value of each power generation unit;
the second calculation unit is used for calculating the sum of rated power of the power generation field according to the rated power of each power generation set;
and the determining unit is used for determining the reactive power regulating quantity of each generator set according to the reactive power compensation value of each generator set, the rated power of each generator set, the sum of the reactive power compensation values and the sum of the rated power.
In an embodiment of the present invention, the determining unit is specifically configured to:
for each generator set, taking the quotient of the rated power of the generator set and the sum of the rated power as a first intermediate value;
taking the product of the first intermediate value and the sum of the reactive power compensation values as a second intermediate value;
and determining the difference value of the reactive power compensation value of the generator set and the second intermediate value as the reactive power regulating quantity of the generator set.
In an embodiment of the present invention, the first determining module is specifically configured to:
taking the quotient of the circumference ratio and the harmonic frequency which needs to be suppressed by the power generation field as the maximum power angle of each generator set;
randomly selecting a power angle from a power angle range for each generator set, and determining the product of the rated power of the generator set and the tangent value of the selected power angle as the reactive power compensation value of the generator set, wherein the power angle range is from a negative maximum power angle to a positive maximum power angle.
In one embodiment of the invention, the apparatus further comprises:
the third determining module is used for determining the reactive power regulating coefficient of each generator set according to the maximum reactive power, the minimum reactive power, the current reactive power and the preset harmonic frequency of each generator set;
the adjustment module is specifically configured to:
and adjusting the reactive power of each generator set according to the reactive power adjustment quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power adjustment coefficient of each generator set.
In one embodiment of the invention, the adjustment module comprises:
the calculating unit is used for calculating the target reactive power of each generator set according to the reactive power regulating quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power regulating coefficient of each generator set;
and the adjusting unit is used for adjusting the reactive power of each generator set according to the target reactive power of each generator set.
In another aspect, an embodiment of the present invention provides a new energy farm harmonic suppression controller, including: a memory and a processor;
the memory is used for storing executable program codes;
the processor is used for reading the executable program codes stored in the memory to execute the method for suppressing the harmonic waves of the new energy power generation field provided by the embodiment of the invention.
In yet another aspect, an embodiment of the present invention provides a computer-readable storage medium having computer program instructions stored thereon; the computer program instructions are executed by a processor to realize the method for suppressing the harmonic waves of the new energy power generation field provided by the embodiment of the invention.
According to the method, the device, the controller and the computer readable storage medium for suppressing the harmonic waves of the new energy power generation field, the power factors of the generator sets are changed by adjusting the reactive power of the generator sets, so that the power factors of the generator sets are different from each other, the phase angles of the harmonic waves generated by the generator sets are different from each other, the harmonic waves are subjected to destructive interference, and the harmonic waves of grid-connected points of the power generation field can be suppressed; and a filter or reactive compensation equipment with a harmonic suppression function is not needed, so that the cost is reduced.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for suppressing new energy farm harmonics according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a reactive power control strategy of a new energy farm to a generator set according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a new energy farm harmonic suppression device provided by an embodiment of the invention;
fig. 4 illustrates a block diagram of an exemplary hardware architecture of a computing device capable of implementing the new energy farm harmonic suppression method and apparatus according to embodiments of the invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Fig. 1 shows a schematic flow chart of a method for suppressing new energy farm harmonics, according to an embodiment of the present invention. The method for suppressing the harmonic waves of the new energy power generation field can comprise the following steps:
s101: and acquiring the rated power of each generator set of the new energy power plant.
S102: and determining a reactive power compensation value of each generator set according to the rated power of each generator set.
S103: and determining the reactive power regulating quantity of each generator set according to the rated power of each generator set and the reactive power compensation value of each generator set.
S104: and adjusting the reactive power of each generator set according to the reactive power adjustment quantity of each generator set so as to enable the power factors of each generator set in operation to be different and suppress harmonic waves of the power plant.
It should be noted that the new energy farm according to the embodiment of the present invention may be a wind farm or a photovoltaic farm.
For example, the power generation field a will be described as an example.
Assume that the power plant includes 3 generator sets, 1 st, 2 nd and 3 rd generator sets, respectively. The obtained rated power of the 1 st generating set is P1Rated power of No. 2 generating set is P2Rated power of No. 3 generating set is P3。
Assuming that the wind farm needs to reduce the M-th harmonic, it can be understood that the M-th harmonic refers to a wave with a frequency M times the fundamental frequency.
In one embodiment of the present invention, determining the reactive power compensation value of each generator set according to the rated power of each generator set may include:
taking the quotient of the circumference ratio and the harmonic frequency which needs to be suppressed by the power generation field as the maximum power angle of each generator set;
randomly selecting a power angle from a power angle range for each generator set, and determining the product of the rated power of the generator set and the tangent value of the selected power angle as the reactive power compensation value of the generator set, wherein the power angle range is from a negative maximum power angle to a positive maximum power angle.
Specifically, the maximum power angle is calculated according to the following expression (1)
Wherein the content of the first and second substances,
the maximum power angle, pi is the circumferential ratio, and M is the harmonic order.
The following description will take the 2 nd power generation unit as an example.
Aiming at the 2 nd generating set, according to the rated power P of the 2 nd generating set2And determining the reactive power compensation value of the 2 nd generating set.
And (3) calculating a reactive power compensation value of the 2 nd generating set according to the following expression (2).
Wherein, delta Q'nIs the reactive power compensation value, P, of the nth generator setnIs the rated power of the nth generator set,
is composed of
A random value.
In one embodiment of the present invention, in calculating the reactive power compensation value using expression (2), in order to simplify the calculation,
can take on the value of
Or
Calculating the reactive power compensation value of the 2 nd generator set, and then according to the reactive power compensation value delta Q 'of the 2 nd generator set'2And rated power P2And calculating the reactive power regulating quantity of the 2 nd generating set.
In one embodiment of the present invention, determining the reactive power adjustment amount of each generator set according to the rated power of each generator set and the reactive power compensation value of each generator set may include: calculating the sum of the reactive power compensation values of the power plant according to the reactive power compensation value of each generator set; calculating the sum of rated power of the power generation field according to the rated power of each generator set; and determining the reactive power regulating quantity of each generator set according to the reactive power compensation value of each generator set, the rated power of each generator set, the sum of the reactive power compensation values and the sum of the rated power.
It should be noted that the sum of the reactive power compensation values of the power plant is the sum of the rated powers of the generator sets currently and effectively operating in the power plant; the sum of the rated power of the power generation field is the sum of the rated power of each power generation unit which is currently and effectively operated in the power generation field; the generator set which is effectively operated at present refers to a generator set which is in a grid-connected state at present.
In one embodiment of the present invention, determining the reactive power adjustment amount of each generator set according to the reactive power compensation value of each generator set, the rated power of each generator set, the sum of the reactive power compensation values, and the sum of the rated powers may include:
for each generator set, taking the quotient of the rated power of the generator set and the sum of the rated power as a first intermediate value;
taking the product of the first intermediate value and the sum of the reactive power compensation values as a second intermediate value;
and determining the difference value of the reactive power compensation value of the generator set and the second intermediate value as the reactive power regulating quantity of the generator set.
Specifically, △ Q, which is the sum of the reactive power compensation values, is calculated according to the following expression (3)∑。
And N is the total number of the generator sets which effectively operate in the power plant.
The sum P of rated powers is calculated from the following expression (4)∑。
And calculating the reactive power regulating quantity of the 2 nd generating set according to the following expression (5).
Wherein, is Δ QnAnd regulating the reactive power of the nth generator set.
After the reactive power regulating quantity of the 2 nd generating set is calculated, the reactive power regulating quantity delta Q of the 2 nd generating set is calculated2And adjusting the reactive power of the 2 nd generating set.
In one embodiment of the invention, the sum of the reactive power adjustments of the generator sets of the wind farm is zero.
It should be noted that when the reactive voltage command of the grid-connected control point changes or the number of the generator sets changes (such as new generator sets are connected or generator sets are disconnected), the reactive compensation value Δ Q of each generator set needs to be recalculatedn。
In an embodiment of the present invention, before adjusting the reactive power of each generator set according to the reactive power adjustment amount of each generator set, the method for suppressing the harmonics of the new energy farm according to the embodiment of the present invention may further include: and determining the reactive power regulating coefficient of each generator set according to the maximum reactive power, the minimum reactive power, the current reactive power and the preset harmonic frequency of each generator set.
According to the reactive power regulating quantity of each generator set, the reactive power regulating method and the reactive power regulating system, the reactive power of each generator set can comprise the following steps: and adjusting the reactive power of each generator set according to the reactive power adjustment quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power adjustment coefficient of each generator set.
In one embodiment of the present invention, adjusting the reactive power of each generator set according to the reactive power adjustment amount of each generator set, the rated power of each generator set, the current reactive power of each generator set, and the reactive power adjustment coefficient of each generator set may include: calculating the target reactive power of each generator set according to the reactive power regulating quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power regulating coefficient of each generator set; the reactive power of each genset is adjusted based on the target reactive power of each genset.
For example, the following description also takes the 2 nd generator set as an example.
And (4) calculating the target reactive power of the 2 nd generating set according to the following expression (6).
Wherein, Q'nIs the target reactive power of the nth generating set,
is the current reactive power of the nth generator set, KnAnd the reactive power regulation coefficient of the nth generator set.
And is
Namely KnIs 1,
And
the minimum value of the three, wherein,
the maximum reactive power of the nth generating set,
the minimum reactive power of the nth generator set.
In one embodiment of the present invention,
is reactive power calculated and set in advance by an existing method.
And after the target reactive power of the 2 nd generator set is calculated, the reactive power of the 2 nd generator set is adjusted according to the target reactive power of the 2 nd generator set.
In one embodiment of the invention, adjusting the reactive power of each of the gensets based on the target reactive power of each genset may include: and aiming at each generator set, if the target reactive power of the generator set is greater than the maximum reactive power of the generator set, adjusting the reactive power of the generator set to be the maximum reactive power of the generator set.
For example, the following description also takes the 2 nd generator set as an example.
Assume target reactive power Q for the 2 nd genset2' greater than maximum reactive power of 2 nd generating set
Adjusting the reactive power of the 2 nd generating set to
In one embodiment of the invention, adjusting the reactive power of each of the gensets based on the target reactive power of each genset may include: and aiming at each generator set, if the target reactive power of the generator set is smaller than the maximum reactive power of the generator set, adjusting the reactive power of the generator set to be the minimum reactive power of the generator set.
For example, the following description also takes the 2 nd generator set as an example.
Assume target reactive power Q for the 2 nd genset2' less than minimum reactive power of 2 nd generating set
Adjusting the reactive power of the 2 nd generating set to
In one embodiment of the invention, adjusting the reactive power of each of the gensets based on the target reactive power of each genset may include: and aiming at each generator set, if the target reactive power of the generator set is not less than the minimum reactive power of the generator set and not more than the maximum reactive power of the generator set, adjusting the reactive power of the generator set to be the target reactive power of the generator set.
For example, the following description also takes the 2 nd generator set as an example.
Suppose target reactive power Q 'of the 2 nd generating set'2Not less than the minimum reactive power of the 2 nd generating set
And is not more than the maximum reactive power of the 2 nd generating set
Then the reactive power of the 2 nd generating set is adjusted to Q2。
Accordingly, the reactive power of the 2 nd generating set and the 3 rd generating set can be adjusted according to the process.
And due to power factor
Wherein cos phinIs the power factor, P, of the nth generator setnThe rated power of the nth generator set; qnFor nth generator set adjustmentThe latter reactive power.
After the reactive power is adjusted, the power factors of the generator sets are different, the power factor angles are different, the phase angles of the harmonic waves of the generator sets are different, the harmonic waves of the generator sets of the wind power plant are subjected to destructive interference, and the harmonic waves of the two generator sets with opposite phase angles are counteracted based on the principle of the destructive interference of the waves. Harmonics of the farm grid-tie point can thus be suppressed.
According to the method for suppressing the harmonic waves of the new energy farm, the power factors of the generator sets are changed by adjusting the reactive power of the generator sets, so that the power factors of the generator sets are different from each other, the phase angles of the generator sets are different from each other, and the harmonic waves of the grid-connected point of the farm can be suppressed; and a filter or reactive compensation equipment with a harmonic suppression function is not needed, so that the cost is reduced.
The core of the embodiment of the invention is that the power factors of each generator set in operation are different from each other within a reasonable range, so that the harmonic output of a grid-connected point can be reduced without influencing the waveform of a fundamental wave. Therefore, the embodiment of the invention adopts an algorithm of randomizing the reactive set points, and disturbs the reactive commands which are evenly distributed in the prior art, but keeps the reactive sum of the reactive commands unchanged.
As shown in fig. 2, fig. 2 is a schematic diagram illustrating a reactive power control strategy of a new energy farm to a generator set according to an embodiment of the present invention.
The method comprises the steps of acquiring voltage and current data (namely, signals acquired by a CT/PT secondary circuit of a control point) of a control point (namely, a PCC (point of grid connection) through a PT/CT secondary circuit of a voltage transformer/current transformer), calculating active power, reactive power and power factors of the control point, receiving a command (namely, a scheduling (or local) command V/Q/Cos) of the control point, judging whether the calculated reactive power meets the reactive power required by the received command, if not, distributing the reactive power of each generator set by adopting a reactive power average distribution algorithm, and then adjusting the reactive power of each generator set by adopting a random algorithm, so that the power factors of each generator set in operation are different.
At present, the mainstream method for controlling the reactive power/voltage of the new energy station still adopts a reactive power compensation device additionally arranged on the new energy station to control the reactive power/voltage of the wind power station. However, the dynamic reactive power compensation equipment of the new energy station has the obvious disadvantages of high price and high power consumption. Taking a 50 MW-capacity wind power plant as an example, the price of the dynamic reactive power compensation device is more than 100 million RMB, the annual power consumption is about 100 million kW.h, and meanwhile, the later maintenance cost is high and the occupied area of the equipment is large. The embodiment of the invention can inhibit harmonic waves, reduce the harmonic content of the grid-connected point to be within the range of standard requirements, cancel the adjustment of the traditional reactive power compensation device, greatly improve the operation benefit of the new energy station and well meet the requirements of the new energy access system standard.
Corresponding to the method embodiment, the embodiment of the invention also provides a device for suppressing the harmonic waves of the new energy power generation field.
Fig. 3 shows a schematic structural diagram of a new energy farm harmonic suppression device provided by an embodiment of the present invention. The device for suppressing the harmonic waves of the new energy power generation field can comprise:
an obtaining module 301, configured to obtain a rated power of each generator set of the new energy farm.
The first determining module 302 is configured to determine a reactive power compensation value of each generator set according to a rated power of each generator set.
And the second determining module 303 is configured to determine a reactive power adjustment amount of each generator set according to the rated power of each generator set and the reactive power compensation value of each generator set.
And the adjusting module 304 is used for adjusting the reactive power of each generator set according to the reactive power adjusting quantity of each generator set, so that the power factors of each generator set during operation are different, and the harmonic waves of the power plant are suppressed.
In an embodiment of the present invention, the second determining module 303 of the embodiment of the present invention includes:
the first calculation unit is used for calculating the sum of the reactive power compensation values of the power generation field according to the reactive power compensation value of each power generation unit;
the second calculation unit is used for calculating the sum of rated power of the power generation field according to the rated power of each power generation set;
and the determining unit is used for determining the reactive power regulating quantity of each generator set according to the reactive power compensation value of each generator set, the rated power of each generator set, the sum of the reactive power compensation values and the sum of the rated power.
In an embodiment of the present invention, the determining unit is specifically configured to:
for each generator set, taking the quotient of the rated power of the generator set and the sum of the rated power as a first intermediate value; taking the product of the first intermediate value and the sum of the reactive power compensation values as a second intermediate value; and determining the difference value of the reactive power compensation value of the generator set and the second intermediate value as the reactive power regulating quantity of the generator set.
In an embodiment of the present invention, the first determining module 302 may be specifically configured to:
taking the quotient of the circumference ratio and the harmonic frequency which needs to be suppressed by the power generation field as the maximum power angle of each generator set;
randomly selecting a power angle from a power angle range for each generator set, and determining the product of the rated power of the generator set and the tangent value of the selected power angle as the reactive power compensation value of the generator set, wherein the power angle range is from a negative maximum power angle to a positive maximum power angle.
In an embodiment of the present invention, the device for suppressing new energy farm harmonics according to an embodiment of the present invention may further include:
and a third determining module (not shown in the figure) for determining the reactive power regulating coefficient of each generator set according to the maximum reactive power, the minimum reactive power, the current reactive power and the preset harmonic frequency of each generator set.
The adjusting module 304 of the embodiment of the present invention may be specifically configured to:
and adjusting the reactive power of each generator set according to the reactive power adjustment quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power adjustment coefficient of each generator set.
In an embodiment of the present invention, the adjusting module 304 of the embodiment of the present invention may include:
the calculating unit is used for calculating the target reactive power of each generator set according to the reactive power regulating quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power regulating coefficient of each generator set;
and the adjusting unit is used for adjusting the reactive power of each generator set according to the target reactive power of each generator set.
In an embodiment of the present invention, the adjusting unit of the embodiment of the present invention may be specifically configured to:
and aiming at each generator set, if the target reactive power of the generator set is greater than the maximum reactive power of the generator set, adjusting the reactive power of the generator set to be the maximum reactive power of the generator set.
In an embodiment of the present invention, the adjusting unit of the embodiment of the present invention may be specifically configured to:
and aiming at each generator set, if the target reactive power of the generator set is smaller than the maximum reactive power of the generator set, adjusting the reactive power of the generator set to be the minimum reactive power of the generator set.
In an embodiment of the present invention, the adjusting unit of the embodiment of the present invention may be specifically configured to:
and aiming at each generator set, if the target reactive power of the generator set is not less than the minimum reactive power of the generator set and not more than the maximum reactive power of the generator set, adjusting the reactive power of the generator set to be the target reactive power of the generator set.
Details of each part of the new energy farm harmonic suppression device according to the embodiment of the present invention are similar to those of the new energy farm harmonic suppression method according to the embodiment of the present invention described in fig. 1, and details of the embodiment of the present invention are not repeated herein, and relevant parts may be referred to part of the description of the method embodiment.
According to the device for suppressing the harmonic waves of the new energy farm, the power factors of the generator sets are changed by adjusting the reactive power of the generator sets, so that the power factors of the generator sets are different from each other, the phase angles of the generator sets are different from each other, and the harmonic waves of the grid-connected point of the farm can be suppressed; and a filter or reactive compensation equipment with a harmonic suppression function is not needed, so that the cost is reduced.
Fig. 4 illustrates a block diagram of an exemplary hardware architecture of a computing device capable of implementing the new energy farm harmonic suppression method and apparatus according to embodiments of the invention. As shown in fig. 4, computing device 400 includes an input device 401, an input interface 402, a central processor 403, a memory 404, an output interface 405, and an output device 406. The input interface 402, the central processing unit 403, the memory 404, and the output interface 405 are connected to each other through a bus 410, and the input device 401 and the output device 406 are connected to the bus 410 through the input interface 402 and the output interface 405, respectively, and further connected to other components of the computing device 400.
Specifically, the input device 401 receives input information from the outside and transmits the input information to the central processor 403 through the input interface 402; the central processor 403 processes the input information based on computer-executable instructions stored in the memory 404 to generate output information, stores the output information temporarily or permanently in the memory 404, and then transmits the output information to the output device 406 through the output interface 405; output device 406 outputs the output information outside of computing device 400 for use by a user.
That is, the computing device shown in fig. 4 may also be implemented as a new energy farm harmonic rejection controller (i.e., a controller that rejects new energy farm harmonics), which may include: a memory storing executable program code; and a processor which, when reading and executing the executable program code, may implement the method and apparatus for suppressing new energy farm harmonics described in conjunction with fig. 1 to 3, and in one embodiment of the present invention, the computing device shown in fig. 4 may also be implemented as a farm level controller of a new energy farm having a function of suppressing new energy farm harmonics.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium has computer program instructions stored thereon; the computer program instructions, when executed by a processor, implement the method for suppressing new energy farm harmonics according to embodiments of the present invention.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As will be apparent to those skilled in the art, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (8)
1. A method for suppressing new energy farm harmonics, the method comprising:
acquiring rated power of each generator set of the new energy power plant;
determining a reactive power compensation value of each generator set according to the rated power of each generator set;
determining reactive power regulating quantity of each generator set according to the rated power of each generator set and the reactive power compensation value of each generator set;
according to the reactive power regulating quantity of each generator set, regulating the reactive power provided by each generator set so as to enable the power factors of each generator set in operation to be different and inhibit the harmonic waves of the power plant; wherein the content of the first and second substances,
the step of determining the reactive power compensation value of each generator set according to the rated power of each generator set comprises the following steps:
taking the quotient of the circumference ratio and the harmonic number which needs to be suppressed by the power generation field as the maximum power angle of each generator set;
randomly selecting a power angle from a power angle range for each generator set, and determining the product of the rated power of the generator set and the tangent value of the selected power angle as a reactive power compensation value of the generator set, wherein the power angle range is from the negative maximum power angle to the positive maximum power angle;
the determining the reactive power regulating quantity of each generator set according to the rated power of each generator set and the reactive power compensation value of each generator set comprises the following steps:
calculating the sum of the reactive power compensation values of the power plant according to the reactive power compensation value of each generator set;
calculating the sum of rated power of the power generation field according to the rated power of each generator set;
for each generator set, taking the quotient of the rated power of the generator set and the sum of the rated power as a first intermediate value;
taking the product of the first intermediate value and the sum of the reactive power compensation values as a second intermediate value;
and determining the difference value between the reactive power compensation value of the generator set and the second intermediate value as the reactive power regulating quantity of the generator set.
2. The method of claim 1, wherein prior to said adjusting the reactive power of said each generator set based on the amount of reactive power adjustment of said each generator set, the method further comprises:
determining a reactive power regulation coefficient of each generator set according to the maximum reactive power, the minimum reactive power, the current reactive power and a preset harmonic frequency of each generator set;
the reactive power provided by each generator set is adjusted according to the reactive power adjustment quantity of each generator set, and the method comprises the following steps:
adjusting the reactive power provided by each generator set according to the reactive power adjustment quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power adjustment coefficient of each generator set; wherein the content of the first and second substances,
the determining the reactive power regulating coefficient of each generator set according to the maximum reactive power, the minimum reactive power, the current reactive power and the preset harmonic frequency of each generator set comprises the following steps:
determining a reactive power regulation factor for each of the generator sets according to the following formula:
wherein, KnThe reactive power regulating coefficient of the nth generator set,
the maximum reactive power of the nth generator set,
for the minimum reactive power of the nth genset,
for the current reactive power of the nth genset,
for the said maximum power angle, the angle is,
pi is the circumferential ratio and M is the harmonic order.
3. The method of claim 2, wherein the adjusting the reactive power provided by each of the gensets based on the reactive power adjust amount for each genset, the power rating for each genset, the current reactive power for each genset, and the reactive power adjust coefficient for each genset comprises:
calculating the target reactive power of each generator set according to the reactive power regulating quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power regulating coefficient of each generator set;
adjusting the reactive power provided by each generator set according to the target reactive power of each generator set; wherein the content of the first and second substances,
calculating the target reactive power of each generator set according to the reactive power regulating quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power regulating coefficient of each generator set, and comprises the following steps:
calculating a third quotient value of the reactive power regulating quantity of the generator set and the rated power of the generator set aiming at each generator set;
calculating a product value of the third quotient value and a reactive power regulation coefficient of the generator set;
and taking the sum of the current reactive power of the generator set and the product value as the target reactive power of the generator set.
4. An apparatus for suppressing new energy farm harmonics, the apparatus comprising:
the acquisition module is used for acquiring the rated power of each generator set of the new energy power plant;
the first determining module is used for determining a reactive power compensation value of each generator set according to the rated power of each generator set;
the second determining module is used for determining the reactive power regulating quantity of each generator set according to the rated power of each generator set and the reactive power compensation value of each generator set;
the adjusting module is used for adjusting the reactive power of each generator set according to the reactive power adjusting quantity of each generator set, so that the power factors of each generator set in operation are different, and the harmonic waves of the power plant are suppressed; wherein the content of the first and second substances,
the first determining module is specifically configured to:
taking the quotient of the circumference ratio and the harmonic number which needs to be suppressed by the power generation field as the maximum power angle of each generator set;
randomly selecting a power angle from a power angle range for each generator set, and determining the product of the rated power of the generator set and the tangent value of the selected power angle as a reactive power compensation value of the generator set, wherein the power angle range is from the negative maximum power angle to the positive maximum power angle;
the second determining module includes:
the first calculation unit is used for calculating the sum of the reactive power compensation values of the power generation field according to the reactive power compensation value of each power generation unit;
the second calculation unit is used for calculating the sum of the rated power of the power generation field according to the rated power of each power generation unit;
a determining unit, configured to take, for each of the generator sets, a quotient of a rated power of the generator set and a sum of the rated powers as a first intermediate value; taking the product of the first intermediate value and the sum of the reactive power compensation values as a second intermediate value; and determining the difference value between the reactive power compensation value of the generator set and the second intermediate value as the reactive power regulating quantity of the generator set.
5. The apparatus of claim 4, further comprising:
the third determining module is used for determining the reactive power regulating coefficient of each generator set according to the maximum reactive power, the minimum reactive power, the current reactive power and the preset harmonic frequency of each generator set;
the adjusting module is specifically configured to:
adjusting the reactive power of each generator set according to the reactive power adjustment quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power adjustment coefficient of each generator set; wherein the content of the first and second substances,
the determining the reactive power regulating coefficient of each generator set according to the maximum reactive power, the minimum reactive power, the current reactive power and the preset harmonic frequency of each generator set comprises the following steps:
determining a reactive power regulation factor for each of the generator sets according to the following formula:
wherein, KnThe reactive power regulating coefficient of the nth generator set,
the maximum reactive power of the nth generator set,
for the minimum reactive power of the nth genset,
for the current reactive power of the nth genset,
for the said maximum power angle, the angle is,
pi is the circumferential ratio and M is the harmonic order.
6. The apparatus of claim 5, wherein the adjustment module comprises:
the calculating unit is used for calculating the target reactive power of each generator set according to the reactive power regulating quantity of each generator set, the rated power of each generator set, the current reactive power of each generator set and the reactive power regulating coefficient of each generator set;
the adjusting unit is used for adjusting the reactive power of each generator set according to the target reactive power of each generator set; wherein the content of the first and second substances,
the computing unit is specifically configured to:
calculating a third quotient value of the reactive power regulating quantity of the generator set and the rated power of the generator set aiming at each generator set;
calculating a product value of the third quotient value and a reactive power regulation coefficient of the generator set;
and taking the sum of the current reactive power of the generator set and the product value as the target reactive power of the generator set.
7. A controller for suppressing new energy farm harmonics, the controller comprising: a memory and a processor;
the memory is used for storing executable program codes;
the processor is configured to read executable program code stored in the memory to perform the method of suppressing new energy farm harmonics according to any one of claims 1 to 3.
8. A computer readable storage medium having computer program instructions stored thereon; the computer program instructions when executed by a processor implement the method of new energy farm harmonic suppression according to any of claims 1 to 3.
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