CN117375118A - Grid-connected inverter reactive voltage control method based on structural parameter iteration - Google Patents
Grid-connected inverter reactive voltage control method based on structural parameter iteration Download PDFInfo
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- CN117375118A CN117375118A CN202311307237.XA CN202311307237A CN117375118A CN 117375118 A CN117375118 A CN 117375118A CN 202311307237 A CN202311307237 A CN 202311307237A CN 117375118 A CN117375118 A CN 117375118A
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- Power Engineering (AREA)
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Abstract
The invention provides a reactive voltage control method of a grid-connected inverter based on structural parameter iteration, and relates to the technical field of power electronics. The reactive voltage control method of the grid-connected inverter based on the structural parameter iteration comprises the following steps: s1, defining an inverter reactive output model: maintaining the voltage of the grid-connected point at a safe voltage V max The following minimum reactive power output; s2, defining the output of an inverter at the last moment; s3, calculating target reactive power output and recording real-time voltage; s4, adjusting reactive power output of the inverter; s5, updating the structural parameters; s6, calculating target reactive power output at the next moment; s7, calculating structural parameters and inverter output in a cyclic iteration mode. By parameters due to system architectureThe variable quantity is small and slow, so that the system can be approximately regarded as an open loop system at most moments, reactive power following active change is quicker and more accurate, and for the moment less than structural parameter change, the algorithm adopts predictive output first, so that disturbance to a power grid is small, and the power quality is higher.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a grid-connected inverter reactive voltage control method based on structural parameter iteration.
Background
With the development of new energy technology, a plurality of distributed power supplies appear in the power grid, the original tide structure of the power grid is changed due to the distributed power supplies, the voltage of the grid-connected point is increased to exceed the safety protection voltage, and the voltage of the grid-connected point can fluctuate along with the grid-connected power, so that adverse effects are caused on the quality of electric energy.
The existing method for reducing the voltage by means of the reactive output of the inverter is slow in reactive output follow-up response when active changes, adverse effects are caused on the power quality, and the traditional power grid voltage control method is to adjust the voltage by installing some extra voltage control equipment such as a dynamic voltage restorer, an automatic voltage controller, a static synchronous compensator and the like, so that the investment and maintenance cost of the system are greatly increased, and the economic and efficient operation of the whole power generation system cannot be realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a grid-connected inverter reactive voltage control method based on structural parameter iteration, which solves the problems that the existing method for reducing voltage by means of inverter reactive output has slower reactive output following response and bad influence on power quality when active changes.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a grid-connected inverter reactive voltage control method based on structural parameter iteration comprises the following steps:
s1, defining an inverter reactive output model:
firstly, an inverter reactive output model is defined, and grid-connected point voltage can be kept at safe voltage V according to real-time active output of an inverter and on the premise that the active output is the real-time active output of the inverter max The following minimum reactive power output;
s2, defining the output of the inverter at the last moment:
define the voltage of the grid-connected point to be stabilized at V max The active output of the inverter is P (k-1), and the reactive output is Q (k-1);
s3, calculating target reactive power output and recording real-time voltage:
recording active output P (k) of the inverter at the current moment, calculating target reactive output Q (k) at the moment based on structural parameter values b (k-1) and a (k-1) at the last moment, and keeping the grid-connected point voltage at a safe voltage V while the calculation of Q (k) needs to meet the requirement that the active power output by the inverter is P (k) max The voltage V of the real-time grid-connected point is recorded PCC ；
S4, adjusting reactive power output of the inverter:
regulating the actual reactive output of the inverter for stabilizing the voltage at the grid-connected point at V max Recording the adjusted actual reactive power output Q (k);
s5, updating structural parameters:
calculating the values of updated structural parameters a (k) and b (k) according to the values of the current active output P (k) and the current reactive output Q (k), wherein the updated structural parameters a (k) and b (k) are used for calculating the next moment;
s6, calculating target reactive power output at the next moment:
at the next moment, the active output of the inverter is P (k+1), the target reactive output Q (k+1) at the next moment is determined according to the updated structural parameters a (k) and b (k), and the delta Q may need to be adjusted according to the condition of the grid-connected voltage so as to obtain the actual reactive output Q (k+1) suitable for stabilizing the grid-connected voltage;
s7, calculating structural parameters and inverter output in a cyclic iteration mode:
and (3) carrying out loop iteration, sequentially calculating structural parameters a and b at each moment from the step S2 to the step S6, determining active output P and reactive output Q of the inverter, and updating the structural parameters and the inverter output in each loop of iteration so that the inverter can stabilize grid-connected voltage and meet the system requirement.
Preferably, in the step S1, defining the inverter reactive power output model includes the following steps:
Q＝a*P+b；
wherein P is the real-time active output (in watts) of the inverter, and Q is the voltage of the grid-connected point can be kept at the safe voltage V on the premise that the active output is P max The following minimum reactive power output (in volt-ampere reactive power) and a large number of structural parameters of the system are integrated to obtain coefficients a and b in the model.
Preferably, in the step S3, the target reactive power output Q (k) at the moment is calculated by using the structural parameter values a (k-1) and b (k-1) at the previous moment, and the specific algorithm is as follows:
Q*(k)＝a(k-1)*P(k)+b(k-1)。
preferably, in the step S4, the actual reactive power output is as follows:
Q(k)＝Q*(k)+△Q。
preferably, in the step S5, the value of a (k) is calculated according to the values of P (k) and Q (k), and the specific algorithm is as follows:
a(k)＝[Q(k)–Q(k-1)]/[P(k)–P(k-1)]。
preferably, in the step S5, the value of b (k) is calculated according to the values of P (k) and Q (k), and the specific algorithm is as follows:
b(k)＝[Q(k-1)*P(k)–Q(k)*P(k-1)]/[P(k)–P(k-1)]。
the invention provides a reactive voltage control method of a grid-connected inverter based on structural parameter iteration. The beneficial effects are as follows:
according to the invention, through defining an inverter reactive power output model, defining the inverter output at the last moment, calculating the target reactive power output, recording the real-time voltage, adjusting the inverter reactive power output, calculating the target reactive power output at the next moment, and circulating iterative calculation structural parameters and inverter output, each round of iteration updates the structural parameters and the inverter output, the system can be regarded as an open loop system approximately at most moments because the system structural parameters change little and slowly, the reactive power following active power change is quicker and more accurate, and the algorithm adopts a method of predicting the output before correcting the parameters for the moment less than the structural parameters, so that the disturbance to the power grid is smaller, and the electric energy quality is higher.
Drawings
FIG. 1 is a schematic flow chart of the specific steps of the present invention;
FIG. 2 is a schematic flow chart of a detailed method of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
referring to fig. 1 and 2, an embodiment of the present invention provides a reactive voltage control method for a grid-connected inverter based on structural parameter iteration, including the following steps:
s1, defining an inverter reactive output model:
firstly, an inverter reactive power output model is defined, wherein the definition of the inverter reactive power output model comprises the following steps:
Q＝a*P+b；
wherein P is an inverterReal-time active output (in watts) of (1), Q is that the voltage of the grid-connected point can be kept at a safe voltage V on the premise that the active output is P max The following minimum reactive power output (the unit is volt-ampere reactive power), a large number of structural parameters of the system are integrated to obtain coefficients a and b in a model, and the grid-connected point voltage can be kept at a safe voltage V according to the real-time active output of the inverter and on the premise that the active output is the real-time active output of the inverter max The following minimum reactive power output;
s2, defining the output of the inverter at the last moment:
define the voltage of the grid-connected point to be stabilized at V max The active output of the inverter is P (k-1), and the reactive output is Q (k-1);
s3, calculating target reactive power output and recording real-time voltage:
recording the active output P (k) of the inverter at the current moment, and calculating the target reactive output Q (k) at the moment based on the structural parameter values a (k-1) and b (k-1) at the last moment, wherein the specific algorithm is as follows:
Q*(k)＝a(k-1)*P(k)+b(k-1)；
the calculation of Q (k) needs to meet the requirement that the active power output by the inverter is P (k) and simultaneously, the grid-connected point voltage is kept at the safe voltage V max The voltage V of the real-time grid-connected point is recorded PCC ；
S4, adjusting reactive power output of the inverter:
the actual reactive output of the inverter is adjusted as follows:
Q(k)＝Q*(k)+△Q；
the purpose is to stabilize the voltage of the grid-connected point at V max Recording the adjusted actual reactive power output Q (k);
s5, updating structural parameters:
the values of the updated structural parameters a (k) and b (k) are calculated according to the current values of the active output P (k) and the reactive output Q (k), and the value of a (k) is calculated according to the values of P (k) and Q (k), and the specific algorithm is as follows:
a(k)＝[Q(k)–Q(k-1)]/[P(k)–P(k-1)]；
the updated structural parameters a (k) and b (k) are used for the calculation of the next moment, and the value of b (k) is calculated according to the values of P (k) and Q (k), and the specific algorithm is as follows:
b(k)＝[Q(k-1)*P(k)–Q(k)*P(k-1)]/[P(k)–P(k-1)]。
s6, calculating target reactive power output at the next moment:
at the next moment, the active output of the inverter is P (k+1), the target reactive output Q (k+1) at the next moment is determined according to the updated structural parameters a (k) and b (k), and the delta Q may need to be adjusted according to the condition of the grid-connected voltage so as to obtain the actual reactive output Q (k+1) suitable for stabilizing the grid-connected voltage;
s7, calculating structural parameters and inverter output in a cyclic iteration mode:
and (3) carrying out loop iteration, sequentially calculating structural parameters a and b at each moment from the step S2 to the step S6, determining active output P and reactive output Q of the inverter, and updating the structural parameters and the inverter output in each loop of iteration so that the inverter can stabilize grid-connected voltage and meet the system requirement.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The grid-connected inverter reactive voltage control method based on structural parameter iteration is characterized by comprising the following steps of:
s1, defining an inverter reactive output model:
firstly, an inverter reactive output model is defined, and grid-connected point voltage can be kept at safe voltage V according to real-time active output of an inverter and on the premise that the active output is the real-time active output of the inverter max The following minimum reactive power output;
s2, defining the output of the inverter at the last moment:
define the voltage of the grid-connected point to be stabilized at V max The active output of the inverter is P (k-1), and the reactive output is Q (k-1);
s3, calculating target reactive power output and recording real-time voltage:
recording active output P (k) of the inverter at the current moment, calculating target reactive output Q (k) at the moment based on structural parameter values a (k-1) and b (k-1) at the last moment, and keeping the grid-connected point voltage at a safe voltage V while the calculation of Q (k) needs to meet the requirement that the active power output by the inverter is P (k) max The voltage V of the real-time grid-connected point is recorded PCC ；
S4, adjusting reactive power output of the inverter:
regulating the actual reactive output of the inverter for stabilizing the voltage at the grid-connected point at V max Recording the adjusted actual reactive power output Q (k);
s5, updating structural parameters:
calculating the values of updated structural parameters a (k) and b (k) according to the values of the current active output P (k) and the current reactive output Q (k), wherein the updated structural parameters a (k) and b (k) are used for calculating the next moment;
s6, calculating target reactive power output at the next moment:
at the next moment, the active output of the inverter is P (k+1), the target reactive output Q (k+1) at the next moment is determined according to the updated structural parameters a (k) and b (k), and the delta Q may need to be adjusted according to the condition of the grid-connected voltage so as to obtain the actual reactive output Q (k+1) suitable for stabilizing the grid-connected voltage;
s7, calculating structural parameters and inverter output in a cyclic iteration mode:
and (3) carrying out loop iteration, sequentially calculating structural parameters a and b at each moment from the step S2 to the step S6, determining active output P and reactive output Q of the inverter, and updating the structural parameters and the inverter output in each loop of iteration so that the inverter can stabilize grid-connected voltage and meet the system requirement.
2. The grid-connected inverter reactive voltage control method based on structural parameter iteration of claim 1, wherein in the step S1, defining the inverter reactive output model includes the following steps:
Q＝a*P+b；
wherein P is the real-time active output (in watts) of the inverter, and Q is the voltage of the grid-connected point can be kept at the safe voltage V on the premise that the active output is P max The following minimum reactive power output (in volt-ampere reactive power) and a large number of structural parameters of the system are integrated to obtain coefficients a and b in the model.
3. The grid-connected inverter reactive voltage control method based on structural parameter iteration according to claim 1, wherein in the step S3, the structural parameter values a (k-1) and b (k-1) at the previous moment are used to calculate the target reactive output Q (k) at the moment, and the specific algorithm is as follows:
Q*(k)＝a(k-1)*P(k)+b(k-1)。
4. the grid-connected inverter reactive voltage control method based on structural parameter iteration of claim 1, wherein the step S4, the actual reactive output is as follows:
Q(k)＝Q*(k)+△Q。
5. the grid-connected inverter reactive voltage control method based on structural parameter iteration of claim 1, wherein in the step S5, the value of a (k) is calculated according to the values of P (k) and Q (k), and the specific algorithm is as follows:
a(k)＝[Q(k)–Q(k-1)]/[P(k)–P(k-1)]。
6. the grid-connected inverter reactive voltage control method based on structural parameter iteration of claim 1, wherein in the step S5, the value of b (k) is calculated according to the values of P (k) and Q (k), and the specific algorithm is as follows:
b(k)＝[Q(k-1)*P(k)–Q(k)*P(k-1)]/[P(k)–P(k-1)]。
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