CN112448406B - Distributed direct current energy consumption device and control method and control module thereof - Google Patents

Distributed direct current energy consumption device and control method and control module thereof Download PDF

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CN112448406B
CN112448406B CN201910829495.1A CN201910829495A CN112448406B CN 112448406 B CN112448406 B CN 112448406B CN 201910829495 A CN201910829495 A CN 201910829495A CN 112448406 B CN112448406 B CN 112448406B
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direct current
energy
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CN112448406A (en
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王仙荣
李钢
邹凯凯
李建春
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Engineering 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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Abstract

The application provides a distributed direct current energy consumption device, a control method and a control module thereof. The control method comprises the following steps: calculating a first number of energy consuming sub-modules to be invested based on the consumed power of the distributed direct current energy consuming device; calculating a second number of energy consumption sub-modules to be put into based on the direct current bus voltage measured value and the direct current bus voltage control target value; taking the sum of the first quantity and the second quantity as the total quantity of the energy consumption submodules needing to be input; and controlling to input or withdraw the energy consumption sub-modules based on the total number of the energy consumption sub-modules needing to be input.

Description

Distributed direct current energy consumption device and control method and control module thereof
Technical Field
The application relates to the technical field of flexible direct current transmission of a power system, in particular to a distributed direct current energy consumption device and a control method and a control device thereof.
Background
In a hvdc transmission system, dc energy consuming devices are vital equipment. If the power generation end is an inertial power supply similar to wind power, when the power receiving end breaks down, energy is accumulated on the direct current side due to the fact that power cannot be sent out, voltage of a direct current transmission line rises, and safety operation of equipment is damaged.
The distributed direct-current energy consumption device needs to perform voltage-sharing control on energy consumption submodules, namely when the voltage of a certain energy consumption submodule is lower than a certain lower limit or higher than a certain upper limit, the energy consumption submodule needs to be forcibly withdrawn or put into operation so as to ensure that the voltage of the energy consumption submodule is within normal fluctuation. When the number of the energy consumption sub-modules to be put into use is greatly changed, the voltage of part of the energy consumption sub-modules is required to be forcibly put into or withdrawn when the voltage of the energy consumption sub-modules does not reach the voltage limit value, and therefore the switching frequency of the sub-modules is increased.
In the prior art, the difference between the direct current voltage and the target value is simply subjected to PI control adjustment, but PI parameter adjustment is troublesome and basically cannot be changed once the difference is selected. In actual engineering, along with different working conditions or fault types of a power transmission system, the performance of one working condition or fault type is good, and the performance of the other working condition or fault type is poor.
The technical solution disclosed in the document (CN109861269A) is to detect the sending end power as an initial value when a fault occurs, firstly, the obtaining of the power value generally depends on the real-time communication between the control system of the energy consumption device and an upper layer system, such as a PCP, and secondly, the ratio of the sending end power and the power of a single energy consumption component is used as an initial value. According to the scheme, adjustment under different working conditions is considered to a certain extent, but influence of limitation of the power of the receiving end is not considered, and influence of different fault types of the receiving end on limitation of the power of the receiving end is not considered, for example, when the load is transmitted at full power, 2/3 of original power can still be transmitted by a receiving end system under a single-phase short circuit obviously, 1/3 of the current transmission power is more suitable than the current whole transmission power when a PI control initial value is calculated, direct-current voltage can not be controlled in a non-differential mode through the scheme, and requirements for cable insulation are improved. Meanwhile, the control is placed at the sending end, and the energy consumption device aims to ensure that the power of the sending end is not changed during the alternating current fault of the receiving end, namely the power of the sending end is not changed under different faults, but the proper initial values under different faults are different, so that the energy consumption device needs to communicate with the receiving end station in order to realize accurate power switching.
Disclosure of Invention
The embodiment of the application provides a control method for a distributed direct current energy consumption device, which comprises the following steps: calculating a first number of energy consuming sub-modules to be invested based on the consumed power of the distributed direct current energy consuming device; calculating a second number of energy consumption sub-modules to be put into based on the direct current bus voltage measured value and the direct current bus voltage control target value; taking the sum of the first quantity and the second quantity as the total quantity of the energy consumption submodules needing to be input; and controlling to input or withdraw the energy consumption sub-modules based on the total number of the energy consumption sub-modules needing to be input.
According to some embodiments, the power consumed by the device is equal to the product of the current and the dc voltage of the branch in which the device is located.
According to some embodiments, the calculating a first number of energy consuming sub-modules to be invested based on the consumed power of the device comprises: and dividing the consumed power of the device by the average power of the single energy consumption sub-module when the energy consumption sub-module is put into operation, and multiplying the average power by a weighting coefficient to obtain the first number of the energy consumption sub-modules needing to be put into operation.
According to some embodiments, the calculating a second number of energy consuming sub-modules to be invested based on the dc bus voltage measurement value and the dc bus voltage control target value includes: subtracting the direct current bus voltage measured value from the direct current bus voltage control target value to obtain a voltage difference value; and multiplying the voltage difference by a proportionality coefficient to obtain a second number of the energy consumption sub-modules needing to be put into use.
According to some embodiments, the scaling factor is calculated according to the following steps: when U is turned d ≥U r When the utility model is used, the water is discharged,
Figure BDA0002190191940000021
when U is turned d ≤U r When the temperature of the water is higher than the set temperature,
Figure BDA0002190191940000022
wherein, U d Is the measured value of the DC bus voltage, U r For the DC bus voltage control target value, k u Is a proportionality coefficient, n is the minimum total number of energy consuming submodules, n 1p For a first number of energy consuming sub-modules to be put into operation, U dmax For the upper limit of the DC bus voltage allowed, U dmin The allowable lower limit of the voltage of the direct current bus is set, n is the minimum total number of energy consumption submodules, and n is P dmax /P cm ，P dmax For maximum DC power transmission, P cm The average power when a single energy-consuming submodule is put into operation.
According to someIn an embodiment, the scaling factor is calculated according to the following steps: when U is turned d ≥U r When the temperature of the water is higher than the set temperature,
Figure BDA0002190191940000031
when U is turned d ≤U r When the temperature of the water is higher than the set temperature,
Figure BDA0002190191940000032
wherein, U d For said DC bus voltage measurement, U r For the DC bus voltage control target value, k u Is a proportionality coefficient, n is the minimum total number of energy consuming submodules, U dmax Is the allowable upper limit of DC bus voltage, U dmin The allowable lower limit of the voltage of the direct current bus is set, n is the minimum total number of energy consumption submodules, and n is P dmax /P cm ，P dmax For maximum DC power transmission, P cm The average power when a single energy-consuming submodule is put into operation.
According to some embodiments, the calculating a second number of energy consuming sub-modules to be invested based on the dc bus voltage measurement value and the dc bus voltage control target value includes: subtracting the direct current bus voltage measured value from the direct current bus voltage control target value to obtain a voltage difference value; and regulating the voltage difference value by a proportional-integral regulator to obtain a second number of the energy consumption sub-modules needing to be put into operation.
According to some embodiments, the controlling to invest or withdraw the energy consuming sub-modules based on the total number of the energy consuming sub-modules needing to be invested comprises: sequencing the voltage of the energy consumption sub-modules; when the total number of the energy consumption sub-modules needing to be put into the power grid is larger than the number of the actually put energy consumption sub-modules, putting the energy consumption sub-modules which are not put into the power grid in sequence according to the voltage from large to small; and when the total number of the energy consumption sub-modules needing to be put into the power grid is smaller than the number of the actually put into energy consumption sub-modules, the energy consumption sub-modules which are put into the power grid in multiple are sequentially withdrawn from the power grid according to the voltage from small to large.
According to some embodiments, the energy consuming sub-module is replaced when the voltage of the energy consuming sub-module is below a lower threshold or above an upper threshold.
According to some embodiments, the distributed dc energy consuming device comprises a plurality of said energy consuming sub-modules connected in series.
The embodiment of the application also provides a control device of the distributed direct-current energy consumption device, which comprises a power calculation unit, a voltage calculation unit, a total amount calculation unit and a control unit, wherein the power calculation unit calculates a first number of energy consumption sub-modules to be put into based on the consumed power of the distributed direct-current energy consumption device; the voltage calculation unit calculates a second number of energy consumption sub-modules to be put into operation based on the direct current bus voltage measurement value and the direct current bus voltage control target value; the total amount calculation unit takes the sum of the first amount and the second amount as the total amount of the energy consumption sub-modules needing to be input; and the control unit controls to input or quit the energy consumption submodules based on the total number of the energy consumption submodules needing to be input.
The embodiment of the present application further provides a distributed dc energy consumption device, including the control module and the plurality of energy consumption sub-modules connected in series as described above.
According to the technical scheme provided by the embodiment of the application, communication with other systems is not needed, the number of the energy consumption sub-modules is divided into a first number calculated based on power and a second number calculated based on voltage, the second number calculated based on voltage can guarantee the instantaneous regulation and control capability of the energy consumption device at the moment of failure, during the steady-state operation of the energy consumption device, the first number calculated based on power can well reflect abundant power which is actually consumed by the energy consumption device, the required input number of the energy consumption sub-modules is properly adjusted near the working point, the required input number change rate of the energy consumption sub-modules can be kept at a small value, the switching control frequency of the energy consumption sub-modules is effectively reduced, the instantaneous regulation and control capability of the energy consumption device at the moment of failure can be guaranteed, and the required input number change rate of the energy consumption sub-modules during the steady-state failure is also reduced.
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In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a wind power generation direct current system provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a distributed dc energy consumption device according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a power consumption submodule provided in an embodiment of the present application;
fig. 4 is a functional block diagram of a control module of a distributed dc energy consuming apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic flowchart of a control method of a distributed dc energy consumption device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, specific embodiments of the technical solutions of the present application will be described in more detail and clearly in the following with reference to the accompanying drawings and the embodiments. However, the specific embodiments and examples described below are for illustrative purposes only and are not intended to limit the present application. It is intended that the present disclosure includes only some embodiments and not all embodiments, and that other embodiments may be devised by those skilled in the art with various modifications as fall within the scope of the appended claims.
It should be understood that the terms "first," "second," "third," and "fourth," etc. in the claims, description, and drawings of the present application are used for distinguishing between different objects and not for describing a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Fig. 1 is a schematic configuration diagram of a wind power generation direct current system according to an embodiment of the present application.
Referring to fig. 1, an offshore converter station 100 converts wind power from ac to dc and transmits it to an onshore converter station 300. The distributed dc power consuming device 200 is installed near the dc side of the onshore converter station 300. The ac side 400 of the land based converter station is the receiving side.
In an hvdc transmission system, the distributed dc energy consuming device 200 is a vital device. The distributed direct current energy consumption device 200 is mainly applied to an application scene of new energy power generation and transmission, if a power generation end is an inertial power supply similar to wind power, when a power receiving end breaks down, energy is accumulated on a direct current side due to the fact that power cannot be sent out, voltage of a direct current transmission line rises, and safety operation of equipment is damaged.
The distributed dc energy consuming apparatus 200 needs to perform voltage-sharing control on the energy consuming sub-modules, that is, when the voltage of a certain energy consuming sub-module is lower than a certain lower limit or higher than a certain upper limit, the energy consuming sub-module needs to be forcibly withdrawn or put into operation, so as to ensure that the voltage of the energy consuming sub-module is within normal fluctuation. When the number of the energy consumption sub-modules to be put into use is greatly changed, the voltage of part of the energy consumption sub-modules is required to be forcibly put into or withdrawn when the voltage of the energy consumption sub-modules does not reach the voltage limit value, and therefore the switching frequency of the sub-modules is increased. How to generate a proper energy consumption submodule requires the investment of the number, and the control of the distributed direct current energy consumption device plays an important role.
Fig. 2 is a schematic structural diagram of a distributed dc energy consumption device according to an embodiment of the present application.
Referring to fig. 2, the distributed dc energy consuming device 200 includes a plurality of energy consuming sub-modules SM and a control module 210 (not shown) connected in series, and the functional components of the control module 210 are in a block diagram form as shown in fig. 4.
Fig. 3 is a schematic structural diagram of an energy consumption submodule provided in an embodiment of the present application.
Referring to fig. 3, the dissipation submodule SM comprises a dissipation resistor R b Energy storage capacitor C and controllable switch Q 1 . Controllable switch Q 1 A parallel diode D2.
By controlling a controllable switch Q 1 The opening and closing of the energy consumption sub-module SM can be controlled. When the energy consumption submodule SM is put into use, the energy consumption is reducedEnergy resistance R b And energy consumption, the voltage of the energy consumption submodule is reduced. When the energy consumption sub-module exits, the energy storage capacitor C is stored with energy through the diode D2, and the voltage of the energy consumption sub-module rises. Therefore, the energy consumption sub-modules are put into use when the voltage is higher than the upper limit threshold value, and the energy consumption sub-modules are quitted when the voltage is lower than the lower limit threshold value.
Fig. 4 is a functional block diagram of a control module of a distributed dc energy consumption device according to an embodiment of the present application.
Referring to fig. 4, the control module 210 includes a power calculation unit 211, a voltage calculation unit 212, a total amount calculation unit 213, and a control unit 214.
The power calculation unit 211 calculates a first number of energy consuming sub-modules to be put into operation based on the power consumption of the distributed dc energy consuming device. The voltage calculating unit 212 calculates a second number of energy consuming sub-modules to be put into operation based on the dc bus voltage measurement value and the dc bus voltage control target value. The total amount calculation unit 213 takes the sum of the first amount and the second amount as the total amount of the energy consuming sub-modules to be invested. The control unit 214 controls to input or quit the energy consumption submodules based on the total number of the energy consumption submodules needing to be input.
Fig. 5 is a schematic flowchart of a control method of a distributed dc energy consumption device according to an embodiment of the present application.
Referring to fig. 5, in S110, a first number of energy consuming sub-modules to be invested is calculated based on the power consumption of the distributed dc energy consuming device.
According to some embodiments, the current and the dc voltage of the branch in which the distributed dc energy consuming device is located are collected, and the consumed power of the distributed dc energy consuming device is equal to the product of the current and the dc voltage of the distributed dc energy consuming device.
Setting DC bus voltage to U d The upper limit of the allowable DC bus voltage conversion range is U dmax Lower limit of U dmin Then U is d <U dmax And U is d >U dmin . Current DC transmission power is P d The current measured by the energy consuming device is I c . The total number of the sub-modules of the energy consumption device is n. Average voltage of single energy consumption sub-moduleIs composed of
Figure BDA0002190191940000071
When one energy consumption submodule is put into energy consumption, the resistance value of the energy consumption resistor of the energy consumption submodule is R, and the average consumed power of the energy consumption submodule is
Figure BDA0002190191940000072
When a three-phase fault occurs on the ac side 400 of the land converter station, the surplus power cannot be transmitted and is accumulated on the dc link, causing the dc transmission voltage to increase. When the DC bus voltage rises U d >U dmax Then, the distributed dc energy consuming apparatus 200 is started.
According to some embodiments, the consumed power P of the current energy consuming device is obtained c ＝U d ·I c 。
Consumption power P of distributed DC energy consumption device c Divided by the average power P of a single energy-consuming submodule when put into operation cm Then multiplied by a weighting coefficient k p Obtaining a first number n of energy consumption sub-modules to be input 1p 。
The calculation formula is as follows:
Figure BDA0002190191940000081
in this example k p ＝1，n 1p Rounding to get the whole.
According to some embodiments, when the direct-current voltage tends to be turned down, a coefficient k of a first number of energy consuming sub-modules to be put into operation is calculated based on power p May take a number greater than 1, e.g. k p ＝1.05。
Referring to fig. 5, in S120, a second number of energy consuming sub-modules to be put into operation is calculated based on the dc bus voltage measurement value and the dc bus voltage control target value.
According to some embodiments, the dc bus voltage measurement value is subtracted from the dc bus voltage control target value to obtain a voltage difference value. Multiplying the voltage difference by a scaling factor k u Obtaining a second number n of energy consumption submodules to be input 1u 。
Setting the DC bus voltage control target value as U r 。
Calculating a second number n of energy consuming sub-modules to be invested 1u ＝k u (U d -U r )，n 1u Rounding to get the whole.
According to some embodiments, when U d ≥U r When the temperature of the water is higher than the set temperature,
Figure BDA0002190191940000082
when the measured value of the direct-current bus voltage is larger than or equal to the target value of the direct-current bus voltage control, more energy-consuming sub-modules are required to be put into use for consuming energy, and when the direct-current bus voltage reaches the allowable upper limit of the direct-current bus voltage, all the energy-consuming sub-modules are put into use.
When U is turned d ≤U r When the temperature of the water is higher than the set temperature,
Figure BDA0002190191940000083
when the measured value of the direct current bus voltage is less than or equal to the direct current bus voltage control target value, the energy consumption sub-modules need to be withdrawn to reduce energy consumption, and when the direct current bus voltage reaches the allowed lower limit of the direct current bus voltage, all the energy consumption sub-modules are withdrawn.
When U is formed d ＝U r When n is greater than n 1u ＝0，k u May take any value.
Wherein, U d For DC bus voltage measurements, U r For controlling the target value, k, of the DC bus voltage u Is a proportionality coefficient, n is the minimum total number of energy consuming submodules, n is 1p For a first number of energy consuming sub-modules to be put into operation, U dmax For the upper limit of the DC bus voltage allowed, U dmin n-P for allowable lower limit of DC bus voltage dmax /P cm ，P dmax For maximum DC power transmission, P cm The average power when a single energy-consuming submodule is put into operation.
Optionally, according to some embodiments, the scaling factor k is u The calculation can also be performed according to the following steps.
When U is turned d ≥U r When the measured value of the direct current bus voltage is more than or equal to the target value of the direct current bus voltage control, the energy consumption submodule is required to consume energy,
Figure BDA0002190191940000091
when U is formed d ≤U r When the measured value of the direct current bus voltage is less than or equal to the direct current bus voltage control target value, the energy consumption submodule needs to be withdrawn to reduce the energy consumption,
Figure BDA0002190191940000092
wherein, the molecule takes a preset value as the minimum total number n of the energy consumption submodules. n ═ P dmax /P cm ，P dmax For maximum DC power transmission, P cm The average power when a single energy-consuming submodule is put into operation. U shape d For DC bus voltage measurements, U r For controlling the target value, k, of the DC bus voltage u Is a proportionality coefficient, n is the minimum total number of energy consuming submodules, U dmax For the upper limit of the DC bus voltage allowed, U dmin And the lower limit is allowed for the direct current bus voltage.
When (U) d -U r ) When equal to 0, n 1u ＝0，k u May take any value.
According to k u The value of (a) is calculated to obtain a second number n of energy-consuming submodules to be put into 1u 。
According to some embodiments, the preset value n herein may also be other parameters selected according to practical situations, and is not limited thereto.
Optionally, according to some embodiments, calculating the second number of energy consuming sub-modules to be invested may also be performed by the PI proportional-integral controller. And subtracting the direct current bus voltage measured value from the direct current bus voltage control target value to obtain a voltage difference value. And regulating the voltage difference value by a proportional-integral regulator to obtain a second number of energy consumption sub-modules needing to be input.
The second number of energy consuming sub-modules comprises the number of effective sub-modules and the number of redundant sub-modules. The number of effective submodules is the lowest submodule number corresponding to the maximum power required to be consumed. The maximum power is generally the maximum transmission power of the dc system. A larger number indicates that a certain number of redundant sub-modules can be selected. The number of redundancies depends on the margin requirements, the larger the margin, the larger the number of redundancies.
Referring to fig. 5, in S130, the sum of the first number and the second number of the energy consuming sub-modules to be invested is used as the total number of the energy consuming sub-modules to be invested.
According to some embodiments, according to the calculation result, a first number n of energy consuming sub-modules needing to be input, which is obtained according to power, can be calculated 1p And obtaining a second number n of energy-consuming sub-modules to be input according to the voltage 1u 。
Total number n of energy consumption submodules needing to be put into 1 Is the sum of the two. Namely: n is 1 ＝n 1p +n 1u 。
Referring to fig. 5, in S140, the energy consuming sub-modules are controlled to be invested or quit based on the total number of the energy consuming sub-modules to be invested.
According to some embodiments, the voltages of the energy consuming sub-modules are ordered. And when the total number of the energy consumption sub-modules needing to be put into the power grid is larger than the number of the actually put into energy consumption sub-modules, putting into the energy consumption sub-modules which are not put into the power grid in sequence according to the voltage from large to small. And when the total number of the energy consumption sub-modules needing to be put into use is smaller than the number of the actually put energy consumption sub-modules, the energy consumption sub-modules with multiple inputs are sequentially withdrawn from small to large according to the voltage.
Specifically, after the total number of energy consumption submodules needing to be input is obtained, the energy consumption submodules are selected for control through a voltage-sharing control algorithm. And the voltage-sharing sequencing principle is that energy-consuming sub-modules with higher voltage are preferentially put in, and energy-consuming sub-modules with lower voltage are preferentially quitted. When the voltage of one energy consumption submodule exceeds the upper limit of the voltage of the submodule or is lower than the lower limit of the voltage of the submodule, forced voltage-sharing replacement is required.
And when the voltage of the energy consumption submodule is lower than the lower limit threshold or higher than the upper limit threshold, replacing the energy consumption submodule. Namely, the energy consumption submodule is withdrawn and another energy consumption submodule is invested.
When a fault just occurs, the power of the distributed direct current energy consumption device is 0, and the second number of energy consumption sub-modules needing to be put into operation is calculated mainly on the basis of voltage and is used as instantaneous control.
When the fault enters a steady state, the power of the distributed direct current energy consumption device is approximately equal to the power lost due to the fault, and the voltage can be maintained in a stable range as long as the energy consumption device consumption power represented by the first number of energy consumption sub-modules needing to be input based on power calculation can be matched with the lost power. The required input number of the energy consumption sub-modules is properly adjusted near the working point, and the change rate of the required input number of the energy consumption sub-modules is maintained at a small value, so that the switching control frequency of the sub-modules is effectively reduced. At the moment, the second number of the energy consumption sub-modules required to be put into operation based on voltage calculation only plays a fine adjustment role, and the first number of the energy consumption sub-modules required to be put into operation based on power calculation is mainly controlled. The instantaneous regulation and control capability of the fault instantaneous energy consumption device is ensured, and the adjustment range of the required input number of the sub-modules in the steady state period is also ensured.
According to the technical scheme provided by the embodiment of the application, communication with other systems is not needed, the number of the energy consumption sub-modules is divided into a first number calculated on the basis of power and a second number calculated on the basis of voltage, the instantaneous regulation and control capacity of the fault instantaneous energy consumption device can be guaranteed by the second number calculated on the basis of voltage, during the steady-state operation of the energy consumption device, the first number calculated on the basis of power can well reflect surplus power actually consumed by the energy consumption device, the required input number of the energy consumption sub-modules is properly regulated near a working point, and the required input number change rate of the energy consumption sub-modules can be kept at a small value, so that the switching control frequency of the energy consumption sub-modules is effectively reduced, the instantaneous regulation and control capacity of the fault instantaneous energy consumption device can be guaranteed, and the required input number change rate of the energy consumption sub-modules during the fault steady-state is also reduced.
It should be noted that each of the embodiments described above with reference to the drawings is only intended to illustrate the present application and not to limit the scope of the present application, and those skilled in the art should understand that modifications and equivalent substitutions made on the present application without departing from the spirit and scope of the present application should be covered in the scope of the present application. Furthermore, unless the context indicates otherwise, words that appear in the singular include the plural and vice versa. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.

Claims (8)

1. A control method of a distributed direct current energy consumption device comprises the following steps:
calculating a first number of energy consuming sub-modules to be invested based on the consumed power of the distributed direct current energy consuming device;
calculating a second number of energy consumption sub-modules to be put into based on the direct current bus voltage measured value and the direct current bus voltage control target value;
taking the sum of the first quantity and the second quantity as the total quantity of the energy consumption submodules needing to be input;
controlling to input or withdraw the energy consumption sub-modules based on the total number of the energy consumption sub-modules needing to be input; wherein
The calculating a first number of energy consuming sub-modules to be invested based on the consumed power of the device comprises: dividing the consumed power of the device by the average power of the single energy consumption sub-module when the energy consumption sub-module is put into the device, and multiplying the average power by a weighting coefficient to obtain a first number of the energy consumption sub-modules needing to be put into the device;
the calculating a second number of energy consumption sub-modules to be put into based on the direct current bus voltage measured value and the direct current bus voltage control target value includes:
subtracting the direct current bus voltage measured value from the direct current bus voltage control target value to obtain a voltage difference value; adjusting the voltage difference value through a proportional integral regulator to obtain a second number of the energy consumption sub-modules needing to be put into; or
Subtracting the direct current bus voltage measured value from the direct current bus voltage control target value to obtain a voltage difference value; multiplying the voltage difference value by a proportionality coefficient to obtain a second number of the energy consumption sub-modules needing to be put into operation, wherein the proportionality coefficient is calculated according to the following steps:
when U is turned d ≥U r When the temperature of the water is higher than the set temperature,
Figure FDA0003720461680000011
when U is formed d ≤U r When the temperature of the water is higher than the set temperature,
Figure FDA0003720461680000012
wherein, U d Is the measured value of the DC bus voltage, U r For the DC bus voltage control target value, k u Is a proportionality coefficient, n is the minimum total number of energy consuming submodules, n is 1p For a first number of energy consuming sub-modules to be put into operation, U dmax For the upper limit of the DC bus voltage allowed, U dmin The allowable lower limit of the voltage of the direct current bus is set, n is the minimum total number of energy consumption submodules, and n is P dmax /P cm ，P dmax For maximum DC power transmission, P cm The average power when a single energy-consuming submodule is put into operation.
2. A control method according to claim 1, wherein the power consumed by said device is equal to the product of the current and the dc voltage of the branch in which said device is located.
3. The control method according to claim 1, wherein the scaling factor is calculated according to:
when U is turned d ≥U r When the temperature of the water is higher than the set temperature,
Figure FDA0003720461680000021
when U is turned d ≤U r When the temperature of the water is higher than the set temperature,
Figure FDA0003720461680000022
wherein, U d Is the measured value of the DC bus voltage, U r For the purpose of controlling the DC bus voltageIndex value, k u Is a proportionality coefficient, n is the minimum total number of energy consuming submodules, U dmax For the upper limit of the DC bus voltage allowed, U dmin The allowable lower limit of the voltage of the direct current bus is set, n is the minimum total number of energy consumption submodules, and n is P dmax /P cm ，P dmax For maximum DC power transmission, P cm The average power when a single energy-consuming submodule is put into operation.
4. The control method according to claim 1, wherein the controlling to invest or withdraw the energy consuming sub-modules based on the total number of the energy consuming sub-modules needing to be invested comprises:
sequencing the voltage of the energy consumption sub-modules;
when the total number of the energy consumption sub-modules needing to be put into the power grid is larger than the number of the actually put energy consumption sub-modules, putting the energy consumption sub-modules which are not put into the power grid in sequence according to the voltage from large to small;
and when the total number of the energy consumption sub-modules needing to be put into the power grid is smaller than the number of the actually put energy consumption sub-modules, sequentially quitting the energy consumption sub-modules with multiple inputs from small to large according to the voltage.
5. The control method of claim 4, wherein the voltage of the energy consuming sub-module is overridden when the voltage is below a lower threshold or above an upper threshold.
6. The control method of claim 1, wherein the distributed dc energy consuming device comprises a plurality of the energy consuming sub-modules connected in series.
7. A control module applying the control method of the distributed dc power consuming apparatus according to any one of claims 1 to 6, comprising:
the power calculation unit is used for calculating a first number of energy consumption sub-modules needing to be put into operation based on the consumed power of the distributed direct current energy consumption device;
the voltage calculation unit is used for calculating a second number of energy consumption sub-modules to be put into the system based on the direct current bus voltage measurement value and the direct current bus voltage control target value;
the total amount calculation unit is used for taking the sum of the first amount and the second amount as the total amount of the energy consumption submodules needing to be input;
and the control unit controls the input or the exit of the energy consumption submodules based on the total number of the energy consumption submodules needing to be input.
8. A distributed dc energy dissipation device, comprising:
the control module of claim 7;
a plurality of energy consuming sub-modules connected in series.
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