CN114844065A - Three-phase unbalanced output control method and system thereof - Google Patents
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase 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
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
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- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a three-phase unbalanced output control method and a system thereof, wherein the method comprises the step of adopting the sum P of three-phase output power ac The sum P of the three-phase grid-connected port power export And limit value P of three-phase grid-connected port power exprotLimit The sum P of the three-phase grid-connected port power is realized by adjusting the output power export Is 3 XP exprotLimit Then limiting the power of the grid-connected ports of two phases to P exprotLimit Realizing three-phase unbalanced output; the system comprises a plurality of photovoltaic assemblies, wherein the output side of each photovoltaic assembly is correspondingly connected with a DC/DC converter and a DC/AC converter, and the DC/AC converters are connected with the three-phase line ends and the zero line ends of three-phase commercial power through four relays. The photovoltaic grid-connected system can meet the requirements of friendliness to the traditional power grid system, spontaneous self-use and improvement on the utilization rate of photovoltaic energy.
Description
Technical Field
The invention relates to an output control method, in particular to a three-phase unbalanced output control method and a system thereof.
Background
With the development and technological progress of the society, the demand of people on energy is increased more and more, the shortage of traditional energy is faced, the development of new energy technology is supported by national policies, solar energy is used as inexhaustible clean energy, the photovoltaic power generation technology is developed rapidly, and the installed capacity of a photovoltaic power generation system is also improved year by year. However, photovoltaic power generation is greatly influenced by the environment, the power generation power of the photovoltaic power generation changes along with the change of illumination conditions, the photovoltaic power generation belongs to unstable energy, and when a large number of photovoltaic systems are connected into a traditional power grid system, impact is brought to the stability of the power grid system; therefore, power companies in some national regions have self-service requirements for users of the photovoltaic grid-connected power generation system, and the feeder power is not allowed.
The existing three-phase photovoltaic grid-connected power generation systems are all three-phase balanced output systems, zero grid-connected power control of the sum of three-phase grid-connected power can be realized, however, when a user load has three-phase imbalance and cannot realize zero grid-connected power control of each phase of grid-connected port power, the situation that some phases have grid-fed power and some phases need to get power from mains supply can exist. Therefore, the current three-phase grid-connected power generation system cannot simultaneously meet the requirements of friendliness to the traditional power grid system, spontaneous self-use and improvement of the photovoltaic energy utilization rate.
Disclosure of Invention
The invention aims to provide a three-phase unbalanced output control method and a system thereof. The photovoltaic grid-connected system can meet the requirements of friendliness to the traditional power grid system, spontaneous self-use and improvement on the utilization rate of photovoltaic energy.
The technical scheme of the invention is as follows: a three-phase unbalanced output control method comprises the following steps:
s1, according to the collected three-phase mains voltage U R 、U S 、U T And three-phase output current I R 、I S 、I T Respectively obtaining the output power P of the three-phase photovoltaic grid-connected inverter R 、P S And P T ；
According to the collected three-phase mains voltage U R 、U S 、U T And three-phase grid-connected port current I export_R 、I export_S 、I export_T Respectively obtaining the power P of the three-phase grid-connected port export_R 、P export_S 、P export_T ；
S2, outputting power P according to three phases R 、P S And P T Obtaining the sum Pac of the three-phase output power;
according to the power P of the three-phase grid-connected port export_R 、P export_S And P export_T To obtain the power sum P of the three-phase grid-connected port export ；
S3, limiting each phase to P according to the power of the three-phase grid connection port set by the user exprotLimit And the sum P of the three-phase output powers ac Sum of power P of three-phase grid-connected ports export Obtaining the output power limit value P of the three-phase photovoltaic grid-connected inverter acLimit ；
S4, comparison P acLimit And P ac The corresponding output power adjustment is carried out to obtain a voltage target value output by the photovoltaic module, and the sum P of the three-phase grid-connected port power is realized export Is 3 XP exprotLimit ；
S5, limiting the power of the R-phase grid-connected port and the S-phase grid-connected port, and adjusting the three-phase output current I peak_ref[R] 、I peak_ref[S] And I peak_ref[T] And three-phase unbalanced output is realized.
In the aforementioned three-phase unbalanced output control method, the Bus voltage control loop reference value Bus is used Ac_ref And bus voltage value U bus Is used as an error signal to output an AC current peak value reference value I through a PI controller peak ；
Limiting the power of an AC grid-connected port by P exprotLimit Power P of R phase grid connection port export_R The difference value of the first and second reference signals is used as an error signal, and is controlled by a PI controller to obtain a current output value and I peak The smaller value of the R phase current is used as the peak value reference value I of the R phase current peak_ref[R] ；
Limiting the power of an AC grid-connected port by P exprotLimit Grid-connected port power P with S phase export_s The difference value is used as an error signal and is controlled by a PI controller to obtain a current output value and I peak The smaller value of the S phase current is used as the peak value reference value I of the S phase current peak_ref[S] ；
Get I peak As reference value of current peak value I of T phase peak_ref[T] 。
In the aforementioned three-phase unbalanced output control method, the three-phase output power and the three-phase grid-connected port powerThe calculation formula is as follows:
where T represents the mains cycle time, u (T) represents the mains voltage transient, and i (T) represents the current transient.
In the aforementioned three-phase unbalanced output control method, the sum P of the three-phase output powers ac ＝P R +P S +P T (ii) a Sum P of three-phase and network port power export ＝P export_R +P export_S +P export_T 。
In the aforementioned three-phase unbalanced output control method, the output power limit value P acLimit ＝P ac +K×(3×P exprotLimit -P export ) Wherein K is an internal control parameter.
In the aforementioned three-phase unbalanced output control method, step S4 specifically includes: comparison P acLimit And P ac If P is the size of acLimit ﹤P ac The power flag is set, if P is acLimit ﹥(P ac + hysteresis threshold), then power flag bit clear is limited; if the power limiting flag bit is set, executing a power limiting control loop, and taking the voltage output value of the power limiting control loop as the voltage target value output by the photovoltaic module; and if the limited power flag bit is not positioned, obtaining a voltage target value output by the photovoltaic module by using a maximum power tracking algorithm.
In the aforementioned three-phase unbalanced output control method, the power limit control loop is P acLimit As a reference value, with P ac Outputting the voltage target value U of the photovoltaic module as a feedback value through a PI controller pvref 。
A system for realizing the three-phase unbalanced output control method comprises a plurality of photovoltaic assemblies, wherein the output side of each photovoltaic assembly is correspondingly connected with a DC/DC converter, the output end of each DC/DC converter is connected with the input end of a DC/AC converter through a direct current bus, the output end of each DC/AC converter is respectively connected with the three-phase line end of a three-phase commercial power through a three-phase relay, and the middle point of the direct current bus is connected with the zero line end of the three-phase commercial power through a zero line relay.
In the system, output current sensors for measuring the output current of the three-phase photovoltaic grid-connected inverter are correspondingly connected in series between the three-phase relay and the DC/AC converter; grid-connected port current sensors for measuring three-phase grid-connected port current are correspondingly connected in series between the three-phase relay and the three-phase mains supply, and a user-side three-phase load and a voltage sensor for measuring three-phase mains supply voltage are respectively connected between the R line and the N line, between the S line and the N line, and between the T line and the N line.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through designing a control algorithm of a three-phase four-wire system output mode, unbalanced output of three-phase power is realized, so that the impact of a photovoltaic system on a traditional power grid system is reduced, the control of the optimal output power of a photovoltaic assembly is realized, the utilization rate of photovoltaic energy is improved, the requirement of spontaneous self-use of a user can be met, the electric quantity of the power grid system can be reduced to the greatest extent by the user, and the electricity charge expense is reduced.
The invention also designs a three-phase photovoltaic grid-connected inverter which can be compatible with two output modes of three-phase three-wire system output and three-phase four-wire system output, so that a user can independently select three-phase output power balance control or three-phase output power unbalance control, control the output mode of the three-phase four-wire system and realize the unbalanced output function of the three-phase four-wire system.
Drawings
FIG. 1 is a schematic diagram of a power limit control loop for summing the power of three-phase ports of the present invention;
FIG. 2 is a schematic diagram of a limiting control loop for each phase of the network port power in the present invention;
fig. 3 is a schematic diagram of a grid-connected inverter circuit of a three-phase unbalanced system.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Example (b):
a three-phase unbalanced output control method comprises the following steps:
s1, selecting three-phase four-wire system output of the three-phase photovoltaic grid-connected inverter and acquiring three-phase mains supply voltage U R 、U S 、U T And three-phase output current I R 、I S 、I T Respectively obtaining three-phase output power P of the three-phase photovoltaic grid-connected inverter R 、P S And P T ；
According to the collected three-phase mains voltage U R 、U S 、U T And three-phase grid-connected port current I export_R 、I export_S 、I export_T Respectively obtaining the power P of the three-phase grid-connected port export_R 、P export_S 、P export_T ；
The calculation formula of the three-phase output power and the three-phase grid-connected port power is as follows:
where T represents the mains cycle time, u (T) represents the mains voltage transient, and i (T) represents the current transient.
S2, outputting power P according to three phases R 、P S And P T Obtaining the sum P of the three-phase output power of the three-phase photovoltaic grid-connected inverter ac ，P ac ＝P R +P S +P T ；
According to the power P of the three-phase grid-connected port export_R 、P export_S And P export_T To obtain the power sum P of the three-phase grid-connected port export ，P export ＝P export_R +P export_S +P export_T ；
S3, limiting each phase to P according to the power of the three-phase grid connection port set by the user exprotLimit And the sum P of the three-phase output powers ac Sum of power P of three-phase grid-connected ports export Obtaining the output power limit value P of the three-phase photovoltaic grid-connected inverter acLimit ；P acLimit ＝P ac +K×(3×P exprotLimit -P export ) Where K is an internal control parameter, and in this embodiment K is 0.1.
S4, comparison P acLimit And P ac If P is the size of acLimit ﹤P ac If so, setting a power limit flag bit, and assigning the power limit flag bit as 1; if P acLimit ﹥(P ac + hysteresis threshold), the power-limited flag bit is cleared, and the power-limited flag bit is assigned to 0; the hysteresis threshold is an internal control parameter, so as to avoid frequent setting and clearing of the power limit flag bit, and in this embodiment, the hysteresis threshold is 200 w; then judging whether a power limit flag bit is set, if so, executing a power limit control loop, and taking a voltage output value of the power limit control loop as a voltage target value output by the photovoltaic module; if the power limit flag bit is not in position, the voltage corresponding to the maximum power is obtained by a maximum power tracking algorithm and is used as the voltage target value output by the photovoltaic module. Thereby realizing the sum P of the power of the three-phase network interface export Is 3 XP exprotLimit 。
Wherein the power limiting control loop is P acLimit As reference value, with P ac Adjusting the output power of the photovoltaic module as a feedback value, and outputting a voltage target value U of the photovoltaic module through a PI controller pvref As shown in fig. 1.
S5, limiting the power of the R-phase grid connection port and the S-phase grid connection port, and controlling the power of the R-phase grid connection port and the power of the S-phase grid connection port to be P exprotLimit Adjusting the peak reference value of the three-phase output current, as shown in FIG. 2, and controlling the Bus voltage control loop reference value Bus Ac_ref And bus voltage value U bus Is used as an error signal to output an AC current peak value reference value I through a PI controller peak ；
Limiting the power of an AC grid-connected port by P exprotLimit Power P of R phase grid connection port export_R The difference value of the first and second reference signals is used as an error signal, and is controlled by a PI controller to obtain a current output value and I peak The smaller value of the R phase current is used as the peak value reference value I of the R phase current peak_ref[R] ；
Limiting AC grid-connected port power by P exprotLimit Grid-connected port power P with S phase export_s The difference value is used as an error signal and is controlled by a PI controller to obtain a current output value and I peak The smaller value of the S phase current is used as the peak value reference value I of the S phase current peak_ref[S] ；
Get I peak As reference value of current peak value I of T phase peak_ref[T] 。
When three phases are unbalanced, I peak_ref[R] 、I peak_ref[S] 、I peak_ref[T] The three-phase unbalanced output is realized for different current values, and when the power limit value P of a grid-connected port is adopted exprotLimit And is 0, zero output of each phase and network port power is realized.
A system for implementing the three-phase unbalanced output control method includes, as shown in fig. 3, a plurality of photovoltaic modules, an output side of each photovoltaic module is correspondingly connected with a DC/DC converter, an output end of each DC/DC converter is connected with an input end of a DC/AC converter through a DC bus, and output ends of the DC/AC converters are respectively connected with an input end of a three-phase relay S through three-phase relays S R 、S S 、S T Is correspondingly connected with the R wire end, the S wire end and the T wire end of the three-phase commercial power, and the midpoint of the direct current bus passes through a zero line relay S N Three-phase relay S connected with N line terminal of three-phase commercial power R 、S S 、S T The three-phase photovoltaic grid-connected inverter output current I for measuring is correspondingly connected in series with the DC/AC converter R 、I S And I T The output current sensor of (1); three-phase relay S R 、S S 、S T The three-phase mains supply is correspondingly connected with the R line end, the S line end and the T line end in series for measuring the current I of the three-phase grid-connected port export_R 、I export_S 、I export_T The three-phase load Z at the user side is respectively and correspondingly connected between the R line and the N line, between the S line and the N line and between the T line and the N line R 、Z S 、Z T And for measuring three-phase mains voltage U R 、U S 、U T The voltage sensor of (1).
When three-phase three-wire system output of the three-phase photovoltaic grid-connected inverter is selected, the relay S of the N wire is disconnected N And balance control of three-phase output power is realized.
When three-phase four-wire system output of the three-phase photovoltaic grid-connected inverter is selected, the relay S of the N wire is closed N Realizing uneven three-phase output powerAnd (5) balance control.
The three-phase output power can be obtained through the collected three-phase output current and three-phase grid voltage of the three-phase photovoltaic grid-connected inverter, and the DSP controller respectively calculates the power of the commercial power port of the three-phase photovoltaic grid-connected inverter. Or a three-phase electric meter can be used, and the three-phase electric meter is used for calculating the power of the commercial power port of the three-phase photovoltaic grid-connected inverter. And then the three-phase power unbalanced output control method is used for realizing zero output or unbalanced output of the grid-connected port power.
Claims (9)
1. A three-phase unbalanced output control method is characterized in that: the method comprises the following steps:
s1, according to the collected three-phase mains voltage U R 、U S 、U T And three-phase output current I R 、I S 、I T Respectively obtaining the output power P of the three-phase photovoltaic grid-connected inverter R 、P S And P T ；
According to the collected three-phase mains voltage U R 、U S 、U T And three-phase grid-connected port current I export_R 、I export_S 、I export_T Respectively obtaining the power P of the three-phase grid-connected port export_R 、P export_S 、P export_T ；
S2, outputting power P according to three phases R 、P S And P T Obtaining the sum Pac of the three-phase output power;
according to the power P of the three-phase grid-connected port export_R 、P export_S And P export_T To obtain the power sum P of the three-phase grid-connected port export ；
S3, limiting each phase to P according to the power of the three-phase grid connection port set by the user exprotLimit And the sum P of the three-phase output powers ac Sum of power P of three-phase grid-connected ports export Obtaining the output power limit value P of the three-phase photovoltaic grid-connected inverter acLimit ；
S4, comparison P acLimit And P ac The output power is correspondingly adjusted to obtain a voltage target value output by the photovoltaic module, and a three-phase grid connection port is realizedSum of powers P export Is 3 XP exprotLimit ；
S5, limiting the power of the R-phase grid-connected port and the S-phase grid-connected port, and adjusting the three-phase output current I peak_ref[R] 、I peak_ref[S] And I peak_ref[T] And three-phase unbalanced output is realized.
2. A three-phase unbalanced output control method as recited in claim 1, wherein: s5 specifically includes: bus voltage control loop reference value Bus Ac_ref And bus voltage value U bus Is used as an error signal to output an AC current peak value reference value I through a PI controller peak ；
Limiting the power of an AC grid-connected port by P exprotLimit Power P of R phase grid connection port export_R The difference value of the first and second reference signals is used as an error signal, and is controlled by a PI controller to obtain a current output value and I peak The smaller value of the R phase current is used as the peak value reference value I of the R phase current peak_ref[R] ；
Limiting the power of an AC grid-connected port by P exprotLimit Grid-connected port power P with S phase export_s The difference value is used as an error signal and is controlled by a PI controller to obtain a current output value and I peak The smaller value of the S phase current is used as the peak value reference value I of the S phase current peak_ref[S] ；
Get I peak As reference value of current peak value I of T phase peak_ref[T] 。
3. A three-phase unbalanced output control method as recited in claim 1, wherein: the calculation formula of the three-phase output power and the three-phase grid-connected port power is as follows:
where T represents the mains cycle time, u (T) represents the mains voltage transient, and i (T) represents the current transient.
4. A three-phase unbalanced output control method as recited in claim 1, wherein: sum P of the three-phase output powers ac ＝P R +P S +P T (ii) a Sum P of three-phase and network port power export ＝P export_R +P export_S +P export_T 。
5. A three-phase unbalanced output control method as recited in claim 1, wherein: the output power limit value P acLimit ＝P ac +K×(3×P exprotLimit -P export ) Wherein K is an internal control parameter.
6. A three-phase unbalanced output control method as recited in claim 1, wherein: step S4 specifically includes: comparison P acLimit And P ac If P is the size of acLimit ﹤P ac The power flag is set, if P is acLimit ﹥(P ac + hysteresis threshold), then power flag bit clear is limited;
if the power limiting flag bit is set, executing a power limiting control loop, and taking the voltage output value of the power limiting control loop as the voltage target value output by the photovoltaic module; and if the limited power flag bit is not positioned, obtaining a voltage target value output by the photovoltaic module by using a maximum power tracking algorithm.
7. A three-phase unbalanced output control method as recited in claim 6, wherein: the power limiting control loop is P acLimit As a reference value, with P ac Outputting the voltage target value U of the photovoltaic module as a feedback value through a PI controller pvref 。
8. A system for implementing the three-phase unbalanced output control method of any one of claims 1 to 7, characterized in that: the photovoltaic module comprises a plurality of photovoltaic modules, wherein the output side of each photovoltaic module is correspondingly connected with a DC/DC converter, the output end of each DC/DC converter is connected with the input end of the DC/AC converter through a direct current bus, the output end of each DC/AC converter is respectively connected with the three-phase line end of a three-phase commercial power through a three-phase relay, and the midpoint of the direct current bus is connected with the zero line end of the three-phase commercial power through a zero line relay.
9. A system according to claim 8, characterized in that: output current sensors for measuring the output current of the three-phase photovoltaic grid-connected inverter are correspondingly connected in series between the three-phase relay and the DC/AC converter; grid-connected port current sensors for measuring three-phase grid-connected port current are correspondingly connected in series between the three-phase relay and the three-phase mains supply, and a user-side three-phase load and a voltage sensor for measuring three-phase mains supply voltage are respectively connected between the R line and the N line, between the S line and the N line, and between the T line and the N line.
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| CN202210540501.3A CN114844065A (en) | 2022-05-17 | 2022-05-17 | Three-phase unbalanced output control method and system thereof |
| PCT/CN2022/097822 WO2023221203A1 (en) | 2022-05-17 | 2022-06-09 | Three-phase imbalance output control method and system therefor |
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| CN202210540501.3A CN114844065A (en) | 2022-05-17 | 2022-05-17 | Three-phase unbalanced output control method and system thereof |
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| CN116260163A (en) * | 2023-02-15 | 2023-06-13 | 无锡天青元储智能科技有限公司 | Three-phase inverter and output power control method and device |
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| JP5259303B2 (en) * | 2008-08-26 | 2013-08-07 | 株式会社東芝 | Inverter device |
| CN101877548B (en) * | 2009-04-28 | 2015-07-29 | 新疆新能源股份有限公司 | For three-phase four-leg inverter and the grid-connected photovoltaic system of parallel network power generation |
| CN112909994B (en) * | 2021-01-22 | 2023-07-11 | 固德威技术股份有限公司 | Unbalanced input and output control method for three-phase inverter |
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| CN116260163A (en) * | 2023-02-15 | 2023-06-13 | 无锡天青元储智能科技有限公司 | Three-phase inverter and output power control method and device |
| CN116260163B (en) * | 2023-02-15 | 2024-01-23 | 无锡天青元储智能科技有限公司 | Three-phase inverter and output power control method and device |
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