CN117375075A - Active voltage support control method, medium and system for optical storage integrated converter - Google Patents
Active voltage support control method, medium and system for optical storage integrated converter 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
- H02J3/381—Dispersed generators
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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Abstract
The invention discloses a method, a medium and a system for controlling the active support of the voltage of an optical storage integrated converter, comprising the following steps: judging the running state of the power grid voltage; and determining a control mode of the grid-connected converter according to the running state of the grid voltage. The method improves the voltage supporting capacity of the new energy grid-connected converter based on model predictive control, and can realize communication-free rapid suppression of photovoltaic power generation.
Description
Technical Field
The invention relates to the technical field of grid-connected converter control, in particular to a method, medium and system for controlling active voltage support of an optical storage integrated converter.
Background
After the high-proportion distributed new energy is connected into the power distribution network, due to insufficient voltage terminal supporting capability, voltage fluctuation of a grid connection point is easy to cause, and the problems of voltage out-of-limit, harmonic resonance and other power quality are caused.
Disclosure of Invention
The embodiment of the invention provides a voltage active support control method, medium and system of an optical storage integrated converter, which are used for solving the problem that the actual active voltage regulation effect is not obvious due to poor consistency of a distributed control method in the prior art.
In a first aspect, a method for controlling active voltage support of an optical storage integrated converter is provided, including:
judging the running state of the power grid voltage;
and determining a control mode of the grid-connected converter according to the running state of the grid voltage.
In a second aspect, there is provided a computer readable storage medium having computer program instructions stored thereon; the computer program instructions when executed by the processor implement the active support control method for the voltage of the light storage integrated converter according to the embodiment of the first aspect.
In a third aspect, a voltage active support control system of an optical storage integrated converter is provided, including: the computer readable storage medium as in the second aspect embodiment.
Therefore, the voltage supporting capacity of the new energy grid-connected converter is improved based on model prediction control, and communication-free rapid suppression of photovoltaic power generation can be achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for controlling active voltage support of an optical storage integrated converter according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a method for actively supporting and controlling a voltage of an optical storage integrated converter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a Q-U control curve;
FIG. 4 is a schematic diagram of a reactive power fast response support simulation waveform of an embodiment of the present invention;
FIG. 5 is a schematic diagram of a q-axis current tracking waveform during reactive response support of an embodiment of the invention;
fig. 6 is a schematic diagram of a current accurate tracking waveform during reactive response of an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. 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.
The embodiment of the invention discloses a voltage active supporting control method of an optical storage integrated converter. The converter of the embodiment of the invention is an MMC converter. As shown in fig. 1 and 2, the method according to the embodiment of the present invention includes the following steps:
step S101: and judging the running state of the power grid voltage.
Specifically, the running state of the grid voltage according to the embodiment of the invention includes: the grid-connected point voltage operates in a normal range, and the grid-connected point voltage rises above the upper limit value of the normal range or the grid-connected point voltage falls above the lower limit value of the normal range. Specifically, the normal range may be empirically set.
Step S102: and determining a control mode of the grid-connected converter according to the running state of the grid voltage.
Specifically, the control mode of the grid-connected converter comprises the following steps: PI control mode and model predictive MPC control mode.
This step includes two cases:
1. when the grid-connected point voltage operates in a normal range, the grid-connected converter is determined to adopt a PI control mode.
The PI control mode of the embodiment of the invention is a constant direct current voltage control mode and a constant reactive power control mode.
Specifically, for the constant DC voltage control mode, the DC bus voltage reference value is the DC bus voltage rated value, i.e. V dcref ＝V 0_dc Wherein V is dcref Is the reference value of the voltage of the direct current bus, V 0_dc Rated for dc bus voltage;
specifically, for the fixed reactive power control mode, the reactive power reference value is the reactive power reference value during normal operation, i.e. Q ref ＝Q 0 . Wherein Q is ref For reactive power reference value, Q 0 The reactive power reference value is a reactive power reference value when the power grid voltage normally operates, and the reactive power reference value is a command value issued by scheduling.
The PI control method is a prior art and will not be described herein.
2. When the voltage of the grid-connected point rises above the upper limit value of the normal range or the voltage of the grid-connected point falls below the lower limit value of the normal range, determining that the grid-connected converter adopts a model predictive control mode.
The model predictive control mode is based on a grid-connected converter grid-side q-axis current reference value and a direct current bus voltage reference value.
Specifically, when the voltage of the grid-connected point rises above the upper limit value of the normal range or the voltage of the grid-connected point falls below the lower limit value of the normal range, the grid-connected converter is controlled to absorb or emit reactive power to adjust the q-axis current reference value of the grid side of the grid-connected converter, and the current running states of the direct current side light power generation modules are integrated to adjust the direct current bus voltage reference value.
1. Grid-connected converter grid-side q-axis current reference value
The q-axis current reference value of the grid-connected converter network side is obtained by d-q inverse transformation of the three-phase current reference value of the grid-connected converter network side.
The grid-connected converter grid-side three-phase current reference value is obtained by inputting grid-connected converter grid-side three-phase voltage and three-phase virtual excitation electromotive force of the virtual synchronous generator VSG into a stator voltage equation of an electromagnetic part of the virtual synchronous generator VSG.
Specifically, the stator voltage equation for the electromagnetic portion of the VSG includes:
wherein i is abc Representing a grid-side three-phase current reference value of the grid-connected converter,L s and R is s Respectively representing the equivalent inductance and the equivalent resistance of the grid side of the grid-connected converter, u abc Representing the grid-side three-phase voltage of the grid-connected converter, e abc The virtual synchronous generator VSG three-phase virtual excitation electromotive force is represented, and t represents the sampling time.
Wherein e j ＝E abc *sinθ j J=a, b, c, let e abc ＝e j ，E abc Representing the virtual excitation electromotive force amplitude value theta of the converter j Represents the phase, θ, of the virtual synchronous generator VSG j The mutual difference is 120 degrees, and the mutual difference can be generally obtained by phase locking of the A-phase voltage at the network side.
Wherein E is abc ＝k 1 (Q ref -Q)+k 2 (U ref -U 0 )，Q ref Representing the reactive power reference value, Q representing the actual measured reactive power value, U ref Representing grid-connected side AC voltage rating, U 0 Representing the actual measured ac voltage effective value, k at the grid-connected side 1 Representing reactive power regulation factor, k 2 Representing the voltage regulation factor, k 1 ，k 2 May be set empirically.
When the voltage of the grid-connected point rises above the upper limit value, the grid-connected converter is controlled to absorb reactive power, Q ref ＝Q 0 +Δq; when the voltage of the grid-connected point is reduced to exceed the lower limit value, controlling the grid-connected converter to generate reactive power, and controlling the grid-connected converter to generate Q ref ＝Q 0 - Δq; Δq represents the reactive power corresponding to the difference between the actual measured grid-tie voltage value and the grid-tie voltage rating obtained on a preset reactive-voltage sag curve (as shown in fig. 3).
2. DC bus voltage reference value
Specifically, the adjustment of the dc bus voltage reference value includes the following cases:
(1) When the voltage of the grid-connected point is increased to exceed the upper limit value, if the current operation state of at least one direct-current side light power generation module is a voltage limiting operation state, the direct-current bus voltage reference value is kept to be the direct-current bus voltage rated value.
In V form dcref Representing the voltage reference value of the direct current bus by V 0_dc Indicating the rated value of the DC bus voltage, then V dcref ＝V 0_dc 。
(2) When the grid-connected point voltage rises above the upper limit value, if the current operation states of all the direct-current side photovoltaic power generation modules are non-voltage-limiting operation states and the current operation state of at least one direct-current side photovoltaic power generation module is an MPPT (maximum power point tracking ) operation state, adjusting the direct-current bus voltage reference value to be the difference between the direct-current bus voltage rated value and the preset voltage variation value, and switching the operation state of the direct-current side photovoltaic power generation module with the current operation state being the MPPT operation state to the non-MPPT operation state.
It should be understood that the preset voltage variation value is greater than 0. At DeltaV dc Representing a preset voltage variation value, then V dcref ＝V 0_dc -ΔV dc 。
(3) When the grid-connected point voltage is reduced to exceed the lower limit value, if the current running states of all the direct-current side-light power generation modules are MPPT running states or voltage limiting running states, the direct-current bus voltage reference value is kept to be the direct-current bus voltage rated value.
(4) When the grid-connected point voltage is reduced to exceed the lower limit value, if the current operation state of at least one direct-current side light power generation module is a non-MPPT operation state and the current operation states of all the direct-current side light power generation modules are not voltage limiting operation states, adjusting the direct-current bus voltage reference value to be the sum of the direct-current bus voltage rated value and a preset voltage change value, and switching the operation state of the direct-current side light power generation module with the current operation state being the non-MPPT operation state to the MPPT operation state.
I.e. V dcref ＝V 0_dc +ΔV dc 。
Specifically, the model predictive control method includes:
1. discretizing the established grid-connected converter mathematical model to obtain a discrete mathematical model.
The grid-connected converter of the embodiment of the invention can be a Modular Multilevel Converter (MMC) which consists of three-phase six bridge arms, wherein each bridge arm comprises N half-bridge submodules and a bridge arm inductor, and a phase output end is led out from between an upper bridge arm and a lower bridge arm and is connected with a power grid through a converter transformer.
The grid-connected converter mathematical model is established through kirchhoff's law KVL, and the grid-connected converter mathematical model is specifically as follows:
wherein U is k Representing three-phase voltage at grid side of grid-connected converter, i vk Represents three-phase current at grid side of grid-connected converter, e k Represents the voltage difference of the upper bridge arm and the lower bridge arm, e k ＝(v nk -v pk )/2，v pk Representing the upper arm voltage, v nk Representing the voltage of the lower bridge arm, R s Representing the equivalent resistance of the grid side of the grid-connected converter, L s The method is characterized in that the method comprises the steps of representing grid-connected converter grid-side equivalent inductance, R representing bridge arm equivalent resistance, L representing bridge arm equivalent inductance, and k=a, b, c and t representing sampling time.
Discretizing the grid-connected converter mathematical model by a first-order Euler method, wherein the obtained discrete mathematical model is specifically as follows:
wherein T is s Represents the sampling period, L' =l s +L/2，R′＝R s +R/2。
2. And obtaining a grid-connected converter network side d-axis current reference value under a d-q coordinate system through a PI control loop by using the direct current bus voltage reference value and the actually measured direct current bus voltage.
This process is prior art and will not be described in detail herein.
3. And d-q inverse transformation is carried out on the grid-connected converter grid-side d-axis current reference value and the grid-connected converter grid-side q-axis current reference value to obtain a grid-connected converter grid-side three-phase current reference value.
4. And constructing a cost function based on the grid-connected converter grid-side three-phase current reference value and the grid-connected converter grid-side three-phase current obtained through discrete mathematical model calculation.
Specifically, cost function J k The following are provided:
J k ＝|i vkref (t+T s )-i vk (t+T s )|。
wherein i is vkref Representing three-phase current reference values at the grid side of the grid-connected converter, namely i obtained in the previous step abc 。
5. And calculating to obtain the voltage difference of the upper bridge arm and the lower bridge arm when the cost function is minimum.
In particular, the method comprises the steps of,representing a cost function J k The voltage difference between the upper bridge arm and the lower bridge arm is the minimum, < + >>The range of the values is as follows: />M is selected from the group->N represents the number of sub-modules of the grid-connected inverter Shan Qiaobei.
6. And calculating the number of the sub-modules input by the upper bridge arm and the number of the sub-modules input by the lower bridge arm based on the voltage difference between the upper bridge arm and the lower bridge arm when the cost function is minimum.
Specifically, the number of sub-modules SMn put into the upper bridge arm pj The formula of (a) includes:
specifically, the number of submodules SMn to which the lower arm is put nj The formula of (a) includes:
wherein V is dc Representing the dc bus voltage.
7. And outputting control pulses of the sub-modules of the upper bridge arm and the lower bridge arm through NLM modulation so as to realize the quantity of the sub-modules respectively input into the upper bridge arm and the lower bridge arm.
In general, a sub-module comprises two switching tubes, and when the sub-module is put in, the pulse is (1, 0); when the submodule is resected, the pulse is (0, 1). NLM modulation is the prior art, and is not repeated here, and corresponding submodules are put into action on the grid-connected converter through control pulses.
Reactive fast tracking and control are carried out in a model predictive control mode, so that active voltage support control is realized.
Fig. 4 to 6 are simulation results of model predictive control and conventional double closed loop control in reactive power step. Wherein the set value of the phase voltage of the alternating current bus is 10kV, the set value of the direct current voltage is 20kV, and the set value of the reactive power is 0. At 1.3s, the reactive power setpoint was changed from 0 to 4MVar (0.4 pu). As can be seen from fig. 4 and fig. 5, when the reactive power set value is changed, under the control of model prediction, the reactive power and q-axis tracking current can quickly track the target value, and the phenomenon of overshoot is basically avoided after the target value reaches the preset value, so that the convergence speed is high; under the traditional double closed-loop control, the reactive power and the q-axis tracking current have obvious overshoots, and the power fluctuation phenomenon exists; after the 1.4s system is recovered, the model predictive control can be quickly recovered to an initial value, the traditional double closed-loop control has obvious overshoot and is stable after 200ms fluctuation, in practical engineering, reactive overshoot after the fault removal of the converter is one of main reasons for causing transient overvoltage of the system, and when serious, the power grid equipment is exposed to damage risk. Fig. 6 shows the three-phase current waveform condition of the grid-connected point in the reactive step process, and the model predictive control can accurately track the alternating current, and the harmonic content is low.
In addition, the embodiment of the invention also provides a computer readable storage medium, and the computer readable storage medium is stored with computer program instructions; the computer program instructions when executed by the processor implement the method for actively supporting and controlling the voltage of the light storage integrated converter according to the embodiment.
In addition, the embodiment of the invention also provides a voltage active supporting control system of the light-storage integrated converter, which comprises the following components: the computer-readable storage medium as in the above embodiments.
In summary, the embodiment of the invention improves the voltage supporting capability of the new energy grid-connected converter based on model prediction control, simultaneously realizes direct-current side light direct-current boost collection based on the converter, realizes grid connection of the alternating-current side, cooperatively adjusts direct-current voltage and active reactive power control of the converter grid side, realizes automatic control of photovoltaic power generation active power, and realizes communication-free rapid suppression of photovoltaic power generation power.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. The active voltage support control method for the light storage integrated converter is characterized by comprising the following steps of:
judging the running state of the power grid voltage;
and determining a control mode of the grid-connected converter according to the running state of the grid voltage.
2. The method for actively supporting and controlling the voltage of the light-storage integrated converter according to claim 1, wherein the step of determining the control mode of the grid-connected converter according to the operation state of the grid voltage comprises the following steps:
when the voltage of the grid-connected point rises above the upper limit value of the normal range or the voltage of the grid-connected point falls below the lower limit value of the normal range, determining that the grid-connected converter adopts a model predictive control mode.
3. The method for actively supporting and controlling the voltage of the light-storage integrated converter according to claim 2, further comprising: when the voltage of the grid-connected point is increased to exceed the upper limit value of the normal range or the voltage of the grid-connected point is reduced to exceed the lower limit value of the normal range, the grid-connected converter is controlled to absorb or emit reactive power to adjust the q-axis current reference value of the grid side of the grid-connected converter, the current running states of the direct current side light power generation modules are integrated, and the direct current bus voltage reference value is adjusted.
4. A method for actively supporting and controlling a voltage of an optical storage integrated converter according to claim 3, wherein said adjusting a dc bus voltage reference value comprises:
when the voltage of the grid-connected point is increased to exceed the upper limit value, if the current operation state of at least one direct-current side light power generation module is a voltage limiting operation state, keeping the reference value of the direct-current bus voltage as the rated value of the direct-current bus voltage;
when the grid-connected point voltage rises above the upper limit value, if the current operation states of all the direct-current side light power generation modules are non-voltage limiting operation states and at least one of the current operation states of the direct-current side light power generation modules is MPPT operation state, adjusting the direct-current bus voltage reference value to be the difference between the direct-current bus voltage rated value and the preset voltage variation value, and switching the operation state of the direct-current side light power generation module with the current operation state being the MPPT operation state to the non-MPPT operation state.
5. A method for actively supporting and controlling a voltage of an optical storage integrated converter according to claim 3, wherein said adjusting a dc bus voltage reference value comprises:
when the voltage of the grid-connected point is reduced to exceed the lower limit value, if the current running states of all the direct-current side-light power generation modules are MPPT running states or voltage limiting running states, keeping the voltage reference value of the direct-current bus as the rated value of the direct-current bus voltage;
when the grid-connected point voltage is reduced to exceed the lower limit value, if the current operation state of at least one direct-current side light power generation module is a non-MPPT operation state and the current operation states of all the direct-current side light power generation modules are not voltage limiting operation states, adjusting the direct-current bus voltage reference value to be the sum of the direct-current bus voltage rated value and a preset voltage change value, and switching the operation state of the direct-current side light power generation module with the current operation state being the non-MPPT operation state to the MPPT operation state.
6. A method for controlling the active voltage support of an optical storage integrated converter according to claim 3, wherein: the q-axis current reference value of the grid-connected converter grid side is obtained by d-q inverse transformation of the three-phase current reference value of the grid-connected converter grid side;
the grid-connected converter grid-side three-phase current reference value is obtained by inputting grid-connected converter grid-side three-phase voltage and three-phase virtual excitation electromotive force of a virtual synchronous generator VSG into a stator voltage equation of an electromagnetic part of the virtual synchronous generator VSG through calculation;
wherein the stator voltage equation of the electromagnetic part of the virtual synchronous generator VSG comprises:
wherein i is abc Representing three-phase current reference values at grid side of grid-connected converter, L s And R is s Respectively representing the equivalent inductance and the equivalent resistance of the grid side of the grid-connected converter, u abc Representing the grid-side three-phase voltage of the grid-connected converter, e abc Representing the three-phase virtual excitation electromotive force of the virtual synchronous generator VSG, wherein t represents the sampling time;
wherein e j ＝E abc *sinθ j J=a, b, c, let e abc ＝e j ，E abc Representing the virtual excitation electromotive force amplitude value theta of the converter j Representing the phase of the virtual synchronous generator VSG;
wherein E is abc ＝k 1 (Q ref -Q)+k 2 (U ref -U 0 )，Q ref Representing reactive powerThe reference value of the rate, Q, represents the actual measured reactive power value, U ref Representing grid-connected side AC voltage rating, U 0 Representing the actual measured ac voltage effective value, k at the grid-connected side 1 Representing reactive power regulation factor, k 2 Representing a voltage regulation factor;
when the voltage of the grid-connected point rises above the upper limit value, the grid-connected converter is controlled to absorb reactive power, Q ref ＝Q 0 When the voltage of the grid-connected point is reduced to exceed the lower limit value, the grid-connected converter is controlled to generate reactive power, Q ref ＝Q 0 Δq, which represents the reactive power corresponding to the difference between the actual measured grid-tie voltage value and the grid-tie voltage setpoint value taken on a preset reactive-voltage sag curve, Q 0 And representing the reactive power reference value when the power grid voltage is in normal operation.
7. A method for controlling the active support of a voltage of an optical storage integrated converter according to claim 3, wherein the model predictive control method comprises:
discretizing the established grid-connected converter mathematical model to obtain a discrete mathematical model;
the direct current bus voltage reference value and the actually measured direct current bus voltage are subjected to PI control loop to obtain a grid-connected converter network side d-axis current reference value under a d-q coordinate system;
the grid-connected converter grid-side d-axis current reference value and the grid-connected converter grid-side q-axis current reference value are subjected to d-q inverse transformation to obtain a grid-connected converter grid-side three-phase current reference value;
constructing a cost function based on the grid-connected converter grid-side three-phase current reference value and the grid-connected converter grid-side three-phase current obtained through calculation of the discrete mathematical model;
calculating to obtain the voltage difference of the upper bridge arm and the lower bridge arm when the cost function is minimum;
based on the voltage difference between the upper bridge arm and the lower bridge arm when the cost function is minimum, calculating to obtain the number of the sub-modules input by the upper bridge arm and the number of the sub-modules input by the lower bridge arm;
the control pulse of the sub-modules of the upper bridge arm and the lower bridge arm is output through NLM modulation, so that the number of the sub-modules respectively input into the upper bridge arm and the lower bridge arm is realized;
wherein, the grid-connected inverter mathematical model includes:
wherein the discrete mathematical model comprises:
wherein the cost function J k Comprising the following steps:
J k ＝|i vkref (t+T s )-i vk (t+T s )|；
wherein the number of sub-modules SMn of the upper bridge arm input pj The formula of (a) includes:
wherein the quantity SMn of the submodules put into the lower bridge arm nj The formula of (a) includes:
wherein U is k Representing three-phase voltage at grid side of grid-connected converter, i vk Represents three-phase current at grid side of grid-connected converter, e k Represents the voltage difference of the upper bridge arm and the lower bridge arm, e k ＝(v nk -v pk )/2，v pk Representing the upper arm voltage, v nk Representing the voltage of the lower bridge arm, R s Representing the equivalent resistance of the grid side of the grid-connected converter, L s The equivalent inductance of the grid-connected converter on the grid side is represented, R represents the equivalent resistance of a bridge arm, L represents the equivalent inductance of the bridge arm, and k=a, b and cT represents the sampling time, T s Represents the sampling period, L' =l s +L/2，R′＝R s +R/2，i vkref Representing three-phase current reference values at grid side of grid-connected converter, V dc The voltage of the direct current bus is represented,representing a cost function J k The voltage difference between the upper bridge arm and the lower bridge arm is the minimum, < + >>M is selected from the group->N represents the number of sub-modules of the grid-connected inverter Shan Qiaobei.
8. The method for actively supporting and controlling the voltage of the light-storage integrated converter according to claim 1, wherein the step of determining the control mode of the grid-connected converter according to the operation state of the grid voltage comprises the following steps:
when the voltage of the grid-connected point operates in a normal range, determining that the grid-connected converter adopts a PI control mode;
the PI control mode is a constant direct current voltage control mode and a constant reactive power control mode;
for the constant direct current voltage control mode, the direct current bus voltage reference value is a direct current bus voltage rated value;
and for the fixed reactive power control mode, the reactive power reference value is a reactive power reference value when the power grid voltage normally operates.
9. A computer-readable storage medium, characterized by: the computer readable storage medium has stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement the active support control method for the voltage of the light storage integrated converter according to any one of claims 1 to 8.
10. An active voltage support control system of an optical storage integrated converter, which is characterized by comprising: the computer readable storage medium of claim 9.
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| CN104810858A (en) * | 2015-05-27 | 2015-07-29 | 广西大学 | Control method for grid-connected power generation system of optical storage microgrid |
| CN106026163A (en) * | 2016-05-27 | 2016-10-12 | 南京工程学院 | MMC-based low-voltage ride through control method and system of photovoltaic grid-connected inverter |
| CN110535169A (en) * | 2018-05-24 | 2019-12-03 | 中兴通讯股份有限公司 | The method of adjustment and device of DC bus-bar voltage reference value, photovoltaic combining inverter |
| CN114156940A (en) * | 2021-11-30 | 2022-03-08 | 浙江佳乐科仪股份有限公司 | High voltage ride through method and system for photovoltaic power generation system |
| CN116131641A (en) * | 2023-02-23 | 2023-05-16 | 天津大学 | Control method for hybrid modular multilevel converter under direct current distribution network |
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2023
- 2023-10-11 CN CN202311315819.2A patent/CN117375075A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810858A (en) * | 2015-05-27 | 2015-07-29 | 广西大学 | Control method for grid-connected power generation system of optical storage microgrid |
| CN106026163A (en) * | 2016-05-27 | 2016-10-12 | 南京工程学院 | MMC-based low-voltage ride through control method and system of photovoltaic grid-connected inverter |
| CN110535169A (en) * | 2018-05-24 | 2019-12-03 | 中兴通讯股份有限公司 | The method of adjustment and device of DC bus-bar voltage reference value, photovoltaic combining inverter |
| CN114156940A (en) * | 2021-11-30 | 2022-03-08 | 浙江佳乐科仪股份有限公司 | High voltage ride through method and system for photovoltaic power generation system |
| CN116131641A (en) * | 2023-02-23 | 2023-05-16 | 天津大学 | Control method for hybrid modular multilevel converter under direct current distribution network |
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