CN114552613B - Reactive power integrated control method, device, equipment and medium for chain type energy storage device - Google Patents

Reactive power integrated control method, device, equipment and medium for chain type energy storage device Download PDF

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Publication number
CN114552613B
CN114552613B CN202111674953.2A CN202111674953A CN114552613B CN 114552613 B CN114552613 B CN 114552613B CN 202111674953 A CN202111674953 A CN 202111674953A CN 114552613 B CN114552613 B CN 114552613B
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value
current
control
voltage
reactive
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CN114552613A (en
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陈满
李勇琦
彭鹏
汪志强
李毓烜
朱焕杰
雷旗开
文晶
于华龙
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Peak and Frequency Regulation Power Generation Co of China Southern Power Grid Co Ltd
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Peak and Frequency Regulation Power Generation Co of China Southern Power Grid Co Ltd
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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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • 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
    • 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
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application relates to a reactive power integrated control method, device, equipment and medium for a chain type energy storage device. The reactive power comprehensive control method of the chain type energy storage device comprises the following steps: acquiring an examination side alternating voltage, an examination side alternating current, a device side alternating voltage, a device side alternating current and a device control mode; determining an input value of the PI control loop according to the device control mode, the checking side alternating current voltage, the checking side alternating current, the device side alternating current voltage and the device side alternating current; if the transient voltage control is not started, determining a steady-state current limit value of the PI control loop according to the reactive capacity and the rated voltage of the chain energy storage device; and performing PI control according to the input value of the PI control loop and the steady-state current limiting value to obtain the steady-state reactive current. And different reactive power device control modes share the PI control loop and control parameters, so that the stability and operability of reactive power control of the chain type energy storage device are improved.

Description

Reactive power integrated control method, device, equipment and medium for chain type energy storage device
Technical Field
The application relates to the technical field of power system control, in particular to a reactive power comprehensive control method, device, equipment and medium for a chain energy storage device.
Background
Along with the rapid development of wind-solar renewable energy sources, uncertainty of wind-solar generated power brings great challenges to real-time balance of power production and consumption, and the energy storage requirement is promoted to rapidly develop in the large-scale and large-capacity directions. The inconsistency of the battery cells enables the safety of the battery energy storage system to be drastically reduced along with the increase of the serial-parallel connection number of the battery cells, and the problem severely restricts the improvement of the capacity of the battery stack.
The H-bridge chain-type converter has the advantages of high efficiency, reliability, modularization and the like, and is widely applied to the fields of high-voltage motor driving, high-power reactive power compensation and the like. The energy storage battery pack is integrated on the direct current capacitor of the chain converter to form the high-voltage direct-hanging chain type energy storage converter, so that the division control of a huge amount of batteries can be directly realized, the battery circulation is avoided, the safety problem is solved, the complexity of a battery management system is greatly reduced, the current sharing path among the battery packs is shortened, meanwhile, a transformer can be omitted, the efficiency of the system is effectively improved, and the cost is reduced.
However, the existing reactive power control mode cannot comprehensively control reactive current, and is inconvenient to operate.
Disclosure of Invention
Based on the above, it is necessary to provide a method, a device, equipment and a medium for comprehensively controlling reactive power of a chain energy storage device, which can meet the requirement of conveniently controlling reactive power of the chain energy storage device.
In a first aspect, an embodiment of the present application provides a reactive power integrated control method for a chain energy storage device, including:
and acquiring an examination side alternating voltage, an examination side alternating current, a device side alternating voltage, a device side alternating current and a device control mode.
Determining an input value of a PI control loop according to the device control mode, the checking side alternating current voltage, the checking side alternating current, the device side alternating current voltage and the device side alternating current;
if the transient voltage control is not started, determining a steady-state current limit value of a PI control loop according to the reactive capacity and the rated voltage of the chain energy storage device;
and performing PI control according to the input value of the PI control loop and the steady-state current limiting value to obtain steady-state reactive current.
In the embodiment, different reactive power device control modes share the PI control ring and the control parameters, so that the switching of the different reactive power device control modes and the setting of the control parameters are greatly facilitated, and the stability and the operability of reactive power control of the chain type energy storage device are improved.
In one embodiment, the reactive power integrated control method of the chained energy storage device further comprises:
carrying out coordinate transformation and recursive averaging on the alternating voltage at the device side to obtain a transient voltage control value;
if the transient voltage control is started, latching a reactive current target value before the transient voltage control is started;
calculating reactive current increment with adjustable speed according to the transient voltage control value;
adding the reactive current target value and the reactive current increment to obtain a transient current limiting value of a PI control loop;
and performing PI control according to the input value of the PI control loop and the transient current limiting value to obtain the transient reactive current.
In one embodiment, the device control modes include a fixed device reactive power control, a fixed system reactive power control, a fixed alternating voltage control, and a fixed power factor control.
In one embodiment, the determining the input value of the PI control loop according to the device control mode, the check-side ac voltage, the check-side ac current, the device-side ac voltage, and the device-side ac current includes:
if the device control mode is the fixed device reactive power control, calculating to obtain a device side reactive power actual value according to the device side alternating voltage and the device side alternating current; determining an input value of a PI control loop according to a device side reactive power target value and the device side reactive power actual value;
if the device control mode is fixed system reactive power control, calculating according to the checking side alternating voltage and the checking side alternating current to obtain a checking side reactive power actual value; determining an input value of a PI control loop according to the assessment side reactive power target value and the assessment side reactive power actual value;
if the device control mode is fixed alternating voltage control, calculating to obtain an actual value of the alternating voltage at the checking side according to the alternating voltage at the checking side, and determining an input value of a PI control loop according to the actual value of the alternating voltage at the checking side, a target value of the alternating voltage at the checking side and a first per unit value;
if the device control mode is fixed power factor control, an actual value of active power on the assessment side and an actual value of reactive power on the assessment side are obtained through calculation according to the alternating voltage on the assessment side and the alternating current on the assessment side, and an input value of a PI control loop is determined according to the actual value of active power on the assessment side, the target value of the power factor on the assessment side and the actual value of reactive power on the assessment side.
In one embodiment, the performing coordinate transformation and recursive average processing on the device-side ac voltage to obtain a transient voltage control value includes:
performing coordinate transformation on the alternating voltage at the device side to obtain a voltage intermediate value;
and carrying out recursive averaging processing according to the voltage intermediate value to obtain a transient voltage control value.
In one embodiment, the reactive current delta includes a low penetration current delta and a high penetration current delta, and the calculating the reactive current delta from the transient voltage control value includes:
obtaining a low-pass current increment according to the low-pass current increment rate coefficient, the low-pass coefficient, the transient voltage control value and the low-pass voltage threshold value;
and obtaining the high-penetration current increment according to the high-penetration current increment rate coefficient, the high-penetration coefficient, the transient voltage control value and the high-penetration voltage threshold value.
In one embodiment, the adding the reactive current target value to the reactive current increment to obtain the transient current limit value of the PI control loop includes:
if the device side alternating current is lower than a low-pass voltage threshold, adding the reactive current target value and the low-pass current increment to obtain a transient current limiting value of a PI control loop;
and if the alternating current voltage at the device side exceeds a high-voltage threshold, adding the reactive current target value and the high-voltage current increment to obtain a transient current limiting value of the PI control loop.
In a second aspect, embodiments of the present application provide a reactive power integrated control device for a chain energy storage device, including:
the acquisition module is used for acquiring the checking side alternating voltage, the checking side alternating current, the device side alternating voltage, the device side alternating current and the device control mode;
the PI ring input determining module is used for determining an input value of the PI control ring according to the device control mode, the checking side alternating voltage, the checking side alternating current, the device side alternating voltage and the device side alternating current;
the current limiting value determining module is used for determining the steady-state current limiting value of the PI control loop according to the reactive capacity of the chain energy storage device if the transient voltage control is not started;
and the reactive current output module is used for performing PI control according to the input value of the PI control loop and the first current limiting value to obtain reactive current.
In a third aspect, embodiments of the present application provide a computer device comprising a memory storing a computer program and a processor implementing the steps of the method of any of the embodiments described above when the computer program is executed by the processor.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of any of the embodiments described above.
It will be appreciated that the above-mentioned beneficial effects of the reactive power integrated control device for a chain energy storage device according to the second aspect, the computer apparatus according to the third aspect, and the computer readable storage medium according to the fourth aspect may be referred to the above-mentioned beneficial effects of the reactive power integrated control method for a chain energy storage device according to the first aspect and any one of the embodiments thereof, and will not be repeated herein.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a first process of a reactive power integrated control method for a chain-type energy storage device according to one embodiment;
FIG. 2 is a primary loop block diagram of a chain energy storage device;
FIG. 3 is a schematic diagram of a second flow chart of a reactive power integrated control method of a chain-type energy storage device according to an embodiment;
fig. 4 is a schematic diagram of a third flow chart of a reactive power integrated control method of a chain energy storage device according to an embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise. In the description of the present application, the meaning of "several" means at least one, such as one, two, etc., unless explicitly defined otherwise.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
The novel energy station based on wind-solar renewable energy, the fan and the photovoltaic inverter have limited reactive compensation capability, and when the chained energy storage is applied to the novel energy station, the novel energy station can provide reactive power control besides peak clipping, valley filling and other functions.
In one embodiment, as shown in fig. 1 and 4, a method for comprehensively controlling reactive power of a chain energy storage device is provided, including steps S100 to S400.
S100, acquiring an examination side alternating voltage, an examination side alternating current, a device side alternating voltage, a device side alternating current and a device control mode.
As shown in fig. 2, fig. 2 is a main loop structure diagram of the chain energy storage device, in which the ac power grid 10 of the main loop is sequentially connected in series with a transformer 20, a reactor 30, and a power unit 40, and the power unit 40 is formed by connecting n sub-power units (SM 1, SM2, …, SMn) in series. A first end of the transformer 20 is connected to the ac power grid 10, a second end of the transformer 20 is connected to a first end of the reactor 30, and a second end of the reactor 30 is connected to the power unit 40. The examination side ac voltage refers to the ac voltage of the first terminal of the transformer 20, the examination side ac current refers to the ac current of the first terminal of the transformer 20, the device side ac voltage refers to the ac voltage of the second terminal of the transformer 20, and the device side ac current refers to the ac current of the second terminal of the transformer 20. The device control mode is that the chain energy storage device is switched and set according to different requirements, and the device control mode can be correspondingly switched according to different power grid conditions.
S200, determining an input value of a PI control loop according to the device control mode, the checking side alternating current voltage, the checking side alternating current, the device side alternating current voltage and the device side alternating current.
In different device control modes, the input values of the PI control loop are calculated in different manners, and the required calculation data is selected from the checking side ac voltage, the checking side ac current, the device side ac voltage and the device side ac current according to the device control modes to calculate the input values of the PI control loop.
And S300, if the transient voltage control is not started, determining a steady-state current limit value of the PI control loop according to the reactive capacity and the rated voltage of the chain energy storage device.
When the transient voltage is started, whether the current control on the chain energy storage device is transient reactive power control or steady-state reactive power control is determined, wherein the transient reactive power control refers to control under the condition that an alternating current power grid fails, and the steady-state reactive power control refers to control under the condition that the alternating current power grid works normally. If the transient voltage control is not started, the current alternating current power grid works normally, the energy storage device is under steady-state reactive power control, and at the moment, the steady-state current limit value is determined according to the reactive power capacity and the rated voltage of the chain energy storage device. Wherein reactive capacity refers to the capacitive capacity of the chain energy storage device.
And S400, performing PI control according to the input value of the PI control loop and the steady-state current limiting value to obtain steady-state reactive current.
The steady-state current limiting value is used for limiting the output reactive current, the limiting value comprises a maximum limiting value and a minimum limiting value, and the reactive current is between the maximum limiting value and the minimum limiting value. The input value of the PI control loop is the deviation between the target value and the actual value of the corresponding electric quantity under different device control modes, the input value of the PI control loop and the steady-state current limiting value are input into the PI control loop, and the steady-state reactive current is obtained through output.
In the embodiment, different reactive power device control modes share the PI control ring and the control parameters, so that the switching of the different reactive power device control modes and the setting of the control parameters are greatly facilitated, and the stability and the operability of reactive power control of the chain type energy storage device are improved.
In one embodiment, as shown in fig. 3 and 4, the reactive power integrated control method of the chain energy storage device further includes:
and S500, carrying out coordinate transformation and recursive average processing on the alternating voltage at the device side to obtain a transient voltage control value.
The method comprises the steps of carrying out coordinate transformation and recursive average processing on alternating current voltage at a device side to obtain a transient voltage control value, wherein the transient voltage control value is used for controlling subsequent reactive current increment in consideration of reactive current control when an actual alternating current system fails.
And S600, if the transient voltage control is started, latching a reactive current target value before the transient voltage control is started.
If the transient voltage is started, the current alternating current power grid is indicated to be faulty and a transient reactive power control mode is needed, and at the moment, a reactive current target value before the transient voltage is started is needed to be latched and is the output of the PI control loop. Preferably, a reactive current target value of 20ms before the transient voltage start needs to be latched.
And S700, calculating the reactive current increment with adjustable speed according to the transient voltage control value.
The reactive current increment with adjustable rate can adjust the reactive current change rate when the steady-state reactive control enters the transient reactive control, and can reduce the fluctuation of alternating voltage when the reactive current suddenly changes in consideration of the smooth switching of the steady-state reactive control and the transient reactive control, and can control the speed of applying the reactive current when the steady-state reactive control enters the transient reactive control.
S800, adding the reactive current target value and the reactive current increment to obtain a transient current limit value of the PI control loop.
The transient current limiting value is used for limiting reactive current output under transient reactive power control, the transient current limiting value comprises a total limiting value and an integral term limiting value, the total limiting value is the total limiting value of a proportional link and an integral link, the integral term limiting value is the limiting value of the integral link, and a current value obtained by adding a reactive current target value and a reactive current increment is used as the transient current limiting value, so that stable and smooth switching of reactive current can be ensured when the transient reactive power control is switched to steady reactive power control.
And S900, performing PI control according to the input value of the PI control loop and the transient current limiting value to obtain the transient reactive current.
And finally, inputting the input value of the PI control loop and the transient current limiting value into the PI control loop during transient reactive power control, and outputting to obtain the transient reactive current.
In the above-described embodiments, it is considered that the smooth switching is performed before the steady-state reactive power control and the transient reactive power control, and the fluctuation of the ac voltage is reduced when the reactive current suddenly changes. When the steady-state reactive power control is switched into the transient-state reactive power control, the speed of applying reactive current can be controlled through the high-low through current increment rate coefficient, and meanwhile, the transient-state reactive current target value is limited to the PI output and the integral term is limited in amplitude, so that the reactive current can be stably and smoothly switched when the transient-state reactive power control is switched into the steady-state reactive power control, the fluctuation of alternating-current voltage is reduced as much as possible, and the electric energy quality is improved.
In one embodiment, the device control modes include a fixed device reactive power control, a fixed system reactive power control, a fixed alternating voltage control, and a fixed power factor control.
In one embodiment, step S200 specifically includes:
if the device control mode is the fixed device reactive power control, calculating to obtain a device side reactive power actual value according to the device side alternating voltage and the device side alternating current; determining an input value of a PI control loop according to a device side reactive power target value and the device side reactive power actual value;
if the device control mode is fixed system reactive power control, calculating according to the checking side alternating voltage and the checking side alternating current to obtain a checking side reactive power actual value; determining an input value of a PI control loop according to the assessment side reactive power target value and the assessment side reactive power actual value;
if the device control mode is fixed alternating voltage control, calculating to obtain an actual value of the alternating voltage at the checking side according to the alternating voltage at the checking side, and determining an input value of a PI control loop according to the actual value of the alternating voltage at the checking side, a target value of the alternating voltage at the checking side and a first per unit value;
if the device control mode is fixed power factor control, an actual value of active power on the assessment side and an actual value of reactive power on the assessment side are obtained through calculation according to the alternating voltage on the assessment side and the alternating current on the assessment side, and an input value of a PI control loop is determined according to the actual value of active power on the assessment side, the target value of the power factor on the assessment side and the actual value of reactive power on the assessment side.
Specifically, if the device control mode is a fixed device reactive power control, a device side reactive power actual value is calculated according to the device side ac voltage and the device side ac current, and the device side reactive power actual value is calculated in the following manner:
Q_DEV_PU＝Uq_DEV×Id_DEV-Ud_DEV×Iq_DEV
the uq_dev and the ud_dev are respectively a first phase voltage value and a second phase voltage value obtained by transforming the three-phase stationary coordinate of the device side alternating current into the two-phase rotating coordinate, and the iq_dev and the id_dev are respectively a first phase current value and a second phase current value obtained by transforming the three-phase stationary coordinate of the device side alternating current into the two-phase rotating coordinate.
The input value of the PI control loop is calculated in the mode of controlling the reactive device of the fixed device:
deltaQ_DEV_PU＝Qref_DEV_PU-Q_DEV_PU
the deltaq_dev_pu represents an input value (i.e., a deviation amount between a reactive target value and an actual value) of the PI control loop in the constant device power mode, qref_dev_pu represents a device-side reactive power target value, and q_dev_pu represents a device-side reactive power actual value, wherein the device-side reactive power target value is a per-unit device-side reactive power target value, and the device-side reactive power actual value is a per-unit device-side reactive power actual value.
If the device control mode is fixed system reactive power control, calculating according to the checking side alternating voltage and the checking side alternating current to obtain a checking side reactive power actual value, wherein the calculating mode of the checking side reactive power actual value is as follows:
Q_PCC_PU＝Uq_PCC×Id_PCC-Ud_PCC×Iq_PCC
the Ud_PCC and the Uq_PCC are respectively a first phase voltage value and a second phase voltage value obtained by transforming the three-phase static coordinates of the checking side alternating current to the two-phase rotating coordinates, and the Id_PCC and the Iq_PCC are respectively a first phase current value and a second phase current value obtained by transforming the three-phase static coordinates of the checking side alternating current to the two-phase rotating coordinates.
In the control mode of the fixed system reactive power device, the input value of the PI control loop is calculated by the following steps:
deltaQ_PCC_PU＝Qref_PCC_PU-Q_PCC_PU
the deltaQ_PCC_PU represents an input value (namely, deviation between a reactive target value and an actual value) of the PI control loop in a system power setting mode, qref_PCC_PU represents an assessment-side reactive power target value, Q_PCC_PU represents an assessment-side reactive power actual value, the assessment-side reactive power target value is an assessment-side reactive power target value after per unit treatment, and the assessment-side reactive power actual value is an assessment-side reactive power actual value after per unit treatment.
If the device control mode is a fixed alternating voltage control mode, calculating according to the alternating voltage at the checking side to obtain an actual alternating voltage at the checking side, specifically, performing three-phase static coordinate transformation on the alternating voltage at the checking side to two-phase rotating coordinate to obtain a first phase current value ud_PCC and a second phase current value uq_PCC, and taking square root values of the ud_PCC and the uq_PCC as the actual alternating voltage at the checking side.
In the constant ac voltage control mode, the input value of the PI control loop is calculated by:
deltaQ_U_PU＝KQ_U_PU×(Uref_PCC_PU-Urms_PCC_PU)
the deltaq_u_pu represents an input value (i.e., a reactive power deviation amount corresponding to a difference between an ac voltage target value and an actual value) of the PI control loop in the ac voltage calibration mode, uref_pcc_pu represents an ac voltage target value on the examination side, urms_pcc_pu represents an ac voltage actual value on the examination side, kq_u_pu represents a first per unit value, and the first per unit value refers to a reactive power per unit value required for each 1 kv change of ac voltage in the ac voltage calibration mode.
If the device control mode is a constant power factor control mode, calculating according to the checking side alternating voltage and the checking side alternating current to obtain a checking side active power actual value and a checking side reactive power actual value. The calculation mode of the active power actual value P_PCC_PU at the checking side is as follows:
P_PCC_PU＝Ud_PCC×Id_PCC+Uq_PCC×Iq_PCC
the calculation mode of the assessment side reactive power actual value Q_PCC_PU is as follows:
Q_PCC_PU＝Uq_PCC×Id_PCC-Ud_PCC×Iq_PCC
the Ud_PCC and the Uq_PCC are respectively a first phase voltage value and a second phase voltage value obtained by transforming the three-phase static coordinates of the checking side alternating current to the two-phase rotating coordinates, and the Id_PCC and the Iq_PCC are respectively a first phase current value and a second phase current value obtained by transforming the three-phase static coordinates of the checking side alternating current to the two-phase rotating coordinates.
In the constant power factor control mode, the input value (reactive power deviation amount corresponding to the difference between the power factor target value and the actual value) of the PI control loop is calculated by:
Figure BDA0003451566290000131
deltaQ_PCC_PF_PU＝|P_PCC_PU|×tan_theta×(-1)-Q_PCC_PU
the deltaq_pcc_pf_pu represents an input value of the PI control loop (i.e., a reactive power deviation amount corresponding to a difference between a power factor target value and an actual value) in the constant power factor mode, the pf_pcc_pu represents an assessment point power factor target value, the p_pcc_pu represents a per-unit assessment side active power actual value, and the q_pcc_pu represents an assessment side reactive power actual value. The actual value of the active power at the examination side is the actual value of the active power at the examination side which is per unit, and the actual value of the reactive power at the examination side is the actual value of the reactive power at the examination side which is per unit.
The four control modes described above use the same set of PI control parameters.
In one embodiment, determining the transient voltage control value from the device side ac voltage comprises: performing coordinate transformation on the alternating voltage at the device side to obtain a voltage intermediate value; and carrying out recursive averaging processing according to the voltage intermediate value to obtain a transient voltage control value.
Specifically, coordinate transformation refers to transforming three-phase stationary coordinates into two-phase rotating coordinates. Transforming the three-phase stationary coordinate of the device side alternating voltage into the two-phase rotating coordinate to obtain a first phase voltage value Ud and a second term voltage value Uq corresponding to the device side alternating voltage, and taking the square root value of Ud and Uq as a voltage intermediate value Udq, namely
Figure BDA0003451566290000132
Carrying out progressive averaging processing on Udq and carrying out data window progressive averaging processing means that a data window is set according to a control period, and the sampling number in the data window is recorded as K; when the counting number is less than K, the data window is filled withAdding the existing data of the plurality of data blocks to obtain a data sum; when the counting number of points is equal to K, adding the difference between the current data and the K-th data of the data window on the basis of the data and the data; the current data is placed at the first bit of the original data window, the 1 st to K-1 st bits of the original data window are placed along, and then the current data is divided by K to obtain a transient voltage control value after recursive averaging. A preferred, but non-limiting, embodiment is to perform a 10ms recursive averaging process, i.e. to set a 10ms data window depending on the control period.
In one embodiment, the reactive current delta comprises a low penetration current delta and a high penetration current delta, and calculating the reactive current delta from the transient voltage control value comprises: obtaining a low-pass current increment according to the low-pass current increment rate coefficient, the low-pass coefficient, the transient voltage control value and the low-pass voltage threshold value; and obtaining the high-penetration current increment according to the high-penetration current increment rate coefficient, the high-penetration coefficient, the transient voltage control value and the high-penetration voltage threshold value.
Specifically, a low through current delta Δi q_LV The calculation mode of (a) is as follows:
ΔI q_LV ＝α 1 ×K LV ×(Udq-U LV )
wherein: alpha 1 Representing the low through current increment rate coefficient, K LV Represents the low-pass coefficient, udq represents the transient voltage control value after recursive averaging, U LV Indicating a low pass voltage threshold.
High through current delta I q_HV The calculation mode of (a) is as follows:
ΔI q_HV ＝α 2 ×K HV ×(Udq-U HV )
wherein: alpha 2 Represents the high through current increment rate coefficient, K HV Represents the high-pass coefficient, udq represents the transient voltage control value after recursive averaging, U HV Indicating a high pass voltage threshold. Considering smooth switching before steady-state reactive control and transient reactive control, the fluctuation of the ac voltage is reduced when the reactive current suddenly changes. When the steady reactive power control is changed into the transient reactive power control, the high and low through current increment rate coefficient alpha can be used 1 And alpha 2 Control ofThe reactive current is applied fast and slow, so that the steady reactive control is ensured to enter the transient reactive control, and the reactive current can be switched steadily and smoothly.
In one embodiment, the adding the reactive current target value to the reactive current increment to obtain the transient current limit value of the PI control loop includes: if the device side alternating current is lower than a low-pass voltage threshold, adding the reactive current target value and the low-pass current increment to obtain a transient current limiting value of a PI control loop; and if the alternating current voltage at the device side exceeds a high-voltage threshold, adding the reactive current target value and the high-voltage current increment to obtain a transient current limiting value of the PI control loop.
Specifically, since the reactive current increment includes a low-penetration current increment and a high-penetration current increment, it is necessary to determine which reactive current increment is used to calculate the transient current limit value according to whether the device-side alternating voltage exceeds the voltage threshold. And if the device side alternating voltage is lower than the low voltage threshold, adding the reactive current target value and the low voltage increment to obtain a transient current limit value, and if the device side alternating voltage exceeds the high voltage threshold, adding the reactive current target value and the high voltage increment to obtain the transient current limit value.
It should be understood that, although the steps in the flowcharts of fig. 1 and 3 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps in fig. 1 and 3 may include a plurality of steps or stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the execution of the steps or stages is not necessarily sequential, but may be performed in turn or alternately with at least a portion of the steps or stages in other steps or other steps.
In one embodiment, there is provided a reactive power integrated control device of a chain energy storage device, comprising: the device comprises an acquisition module, a PI ring input determination module, a current limiting value determination module and a reactive current output module, wherein the acquisition module is used for acquiring an examination side alternating voltage, an examination side alternating current, a device side alternating voltage, a device side alternating current and a device control mode; the PI ring input determining module is used for determining an input value of the PI control ring according to the device control mode, the checking side alternating voltage, the checking side alternating current, the device side alternating voltage and the device side alternating current; the current limiting value determining module is used for determining a steady-state current limiting value of the PI control loop according to the reactive capacity of the chain energy storage device if the transient voltage control is not started; and the reactive current output module is used for performing PI control according to the input value of the PI control loop and the first current limiting value to obtain reactive current.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, implements the steps of the method embodiments described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (8)

1. The reactive power comprehensive control method of the chain type energy storage device is characterized by comprising the following steps of:
acquiring an examination side alternating voltage, an examination side alternating current, a device side alternating voltage, a device side alternating current and a device control mode; the test side alternating current is an alternating current of a first end of the transformer, the device side alternating current is an alternating current of a second end of the transformer, and the device side alternating current is an alternating current of the second end of the transformer;
if the device control mode is the fixed device reactive power control, calculating to obtain a device side reactive power actual value according to the device side alternating voltage and the device side alternating current; determining an input value of a PI control loop according to a device side reactive power target value and the device side reactive power actual value;
if the device control mode is fixed system reactive power control, calculating according to the checking side alternating voltage and the checking side alternating current to obtain a checking side reactive power actual value; determining an input value of a PI control loop according to the assessment side reactive power target value and the assessment side reactive power actual value;
if the device control mode is fixed alternating voltage control, calculating to obtain an actual value of the alternating voltage at the checking side according to the alternating voltage at the checking side, and determining an input value of a PI control loop according to the actual value of the alternating voltage at the checking side, a target value of the alternating voltage at the checking side and a first per unit value;
if the device control mode is fixed power factor control, calculating an actual value of active power on the assessment side and an actual value of reactive power on the assessment side according to the alternating voltage on the assessment side and the alternating current on the assessment side, and determining an input value of a PI control loop according to the actual value of active power on the assessment side, the target value of power factor on the assessment side and the actual value of reactive power on the assessment side;
if the transient voltage control is not started, determining a steady-state current limit value of a PI control loop according to the reactive capacity and the rated voltage of the chain energy storage device;
and performing PI control according to the input value of the PI control loop and the steady-state current limiting value to obtain steady-state reactive current.
2. The reactive power integrated control method of a chain energy storage device according to claim 1, further comprising:
carrying out coordinate transformation and recursive averaging on the alternating voltage at the device side to obtain a transient voltage control value;
if the transient voltage control is started, latching a reactive current target value before the transient voltage control is started;
calculating reactive current increment with adjustable speed according to the transient voltage control value;
adding the reactive current target value and the reactive current increment to obtain a transient current limiting value of a PI control loop;
and performing PI control according to the input value of the PI control loop and the transient current limiting value to obtain the transient reactive current.
3. The method for comprehensively controlling reactive power of a chain energy storage device according to claim 2, wherein the performing coordinate transformation and recursive average processing on the ac voltage at the device side to obtain the transient voltage control value includes:
performing coordinate transformation on the alternating voltage at the device side to obtain a voltage intermediate value;
and carrying out recursive averaging processing according to the voltage intermediate value to obtain a transient voltage control value.
4. The method of claim 2, wherein the reactive current delta comprises a low-pass current delta and a high-pass current delta, and wherein calculating the reactive current delta from the transient voltage control value comprises:
obtaining a low-pass current increment according to the low-pass current increment rate coefficient, the low-pass coefficient, the transient voltage control value and the low-pass voltage threshold value;
and obtaining the high-penetration current increment according to the high-penetration current increment rate coefficient, the high-penetration coefficient, the transient voltage control value and the high-penetration voltage threshold value.
5. The method of claim 4, wherein adding the reactive current target value to the reactive current increment to obtain a transient current limit value of a PI control loop comprises:
if the device side alternating current is lower than a low-pass voltage threshold, adding the reactive current target value and the low-pass current increment to obtain a transient current limiting value of a PI control loop;
and if the alternating current voltage at the device side exceeds a high-voltage threshold, adding the reactive current target value and the high-voltage current increment to obtain a transient current limiting value of the PI control loop.
6. The utility model provides a chain energy storage device reactive power integrated control device which characterized in that includes:
the acquisition module is used for acquiring the checking side alternating voltage, the checking side alternating current, the device side alternating voltage, the device side alternating current and the device control mode; the test side alternating current is an alternating current of a first end of the transformer, the device side alternating current is an alternating current of a second end of the transformer, and the device side alternating current is an alternating current of the second end of the transformer;
the PI ring input determining module is used for calculating a device side reactive power actual value according to the device side alternating voltage and the device side alternating current if the device control mode is fixed device reactive power control; determining an input value of a PI control loop according to a device side reactive power target value and the device side reactive power actual value;
if the device control mode is fixed system reactive power control, calculating according to the checking side alternating voltage and the checking side alternating current to obtain a checking side reactive power actual value; determining an input value of a PI control loop according to the assessment side reactive power target value and the assessment side reactive power actual value;
if the device control mode is fixed alternating voltage control, calculating to obtain an actual value of the alternating voltage at the checking side according to the alternating voltage at the checking side, and determining an input value of a PI control loop according to the actual value of the alternating voltage at the checking side, a target value of the alternating voltage at the checking side and a first per unit value;
if the device control mode is fixed power factor control, calculating an actual value of active power on the assessment side and an actual value of reactive power on the assessment side according to the alternating voltage on the assessment side and the alternating current on the assessment side, and determining an input value of a PI control loop according to the actual value of active power on the assessment side, the target value of power factor on the assessment side and the actual value of reactive power on the assessment side;
the current limit value determining module is used for determining the steady-state current limit value of the PI control loop according to the reactive capacity and the rated voltage of the chain energy storage device if the transient voltage control is not started;
and the reactive current output module is used for performing PI control according to the input value of the PI control loop and the steady-state current limiting value to obtain steady-state reactive current.
7. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.
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