CN112260327B - New energy reactive power support analysis method based on extra-high voltage alternating current-direct current power grid - Google Patents

New energy reactive power support analysis method based on extra-high voltage alternating current-direct current power grid Download PDF

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CN112260327B
CN112260327B CN202011140404.2A CN202011140404A CN112260327B CN 112260327 B CN112260327 B CN 112260327B CN 202011140404 A CN202011140404 A CN 202011140404A CN 112260327 B CN112260327 B CN 112260327B
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power
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reactive power
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CN112260327A (en
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付红军
孙冉
赵华
高泽
刘轶
张希全
田春笋
潘雪晴
雷一
江坷滕
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Sichuan Jinyue Energy Technology Co ltd
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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Sichuan Jinyue Energy Technology Co ltd
Electric Power Research Institute of State Grid Henan Electric Power 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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

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

Abstract

The invention relates to a new energy reactive power support analysis method based on an extra-high voltage alternating current-direct current power grid, which adopts the following scheme: acquiring a topological structure of an extra-high voltage alternating current and direct current power grid, and determining a power node in the topological structure; determining new energy types in the power nodes, wherein the new energy types comprise double-fed wind motor power generation, direct-drive wind motor power generation and photovoltaic power generation; calculating the maximum value and the minimum value of the adjustable reactive power of each new energy, and determining the voltage change value delta V of a power node bus when the adjustable reactive power of the new energy is changed from the minimum value to the maximum value according to the load flow calculation model; calculating the reactive voltage sensitivity delta of the new energy; sequencing the reactive voltage sensitivity delta of each new energy of all power nodes from large to small, and performing reactive power regulation on the extra-high voltage alternating current-direct current power grid according to the determined reactive voltage sensitivity delta sequencing sequence; the reactive power requirement of the whole extra-high voltage direct current power grid can be met, and the stability of the whole power grid can be ensured.

Description

New energy reactive power support analysis method based on extra-high voltage alternating current-direct current power grid
Technical Field
The invention relates to a power analysis method, in particular to a new energy reactive power support analysis method based on an extra-high voltage alternating current and direct current power grid.
Background
With the rapid development of new energy, a large amount of new energy is often accessed to an extra-high voltage receiving area, and the number of running synchronous machines and dynamic reactive power sources is further reduced. A general new energy power station is provided with a certain number of dynamic reactive power compensation devices to control the voltage or power factor of a grid connection point [3] And excessive reactive power is not sent to the grid for voltage support, because fig. 2 shows: the active power and reactive power curves, the more the reactive power output, the less the active power output, and thus the severe impact on the active power in the power supply.
As mentioned above, reactive power is needed in the extra-high voltage ac/dc power grid to support grid voltage, power factors, etc., but if too many power nodes are put into reactive power regulation, the power output of the whole grid will be seriously affected, but if the reactive power regulation is not enough to meet the requirement of the grid, the stability of the whole grid will be seriously affected, so how to schedule and regulate the reactive support of the extra-high voltage ac/dc power grid becomes a technical problem in the field.
Disclosure of Invention
In view of the above problems, the present invention is directed to a new energy reactive power support analysis method based on an extra-high voltage ac/dc power grid to solve the above technical problems.
The invention provides a new energy reactive power support analysis method based on an extra-high voltage alternating current-direct current power grid, which comprises the following steps of:
s1, acquiring a topological structure of an extra-high voltage alternating current and direct current power grid, and determining a power node in the topological structure;
s2, determining new energy types in the power node, wherein the new energy types comprise double-fed wind motor power generation, direct-drive wind motor power generation and photovoltaic power generation;
s3, calculating the maximum value and the minimum value of the adjustable reactive power of each new energy, and determining a voltage change value delta V of a power node bus when the adjustable reactive power of the new energy is changed from the minimum value to the maximum value according to the load flow calculation model;
s4, calculating reactive voltage sensitivity delta of the new energy:
Figure BDA0002738088990000021
wherein Q is max Maximum value of adjustable reactive power, Q, for new energy min Is the minimum value of the adjustable reactive power of the new energy;
and S5, sequencing the reactive voltage sensitivity delta of each new energy of all the power nodes from large to small, and carrying out reactive power regulation on the extra-high voltage alternating current-direct current power grid according to the determined reactive voltage sensitivity delta sequencing sequence.
Preferably: in step S3, the maximum value and the minimum value of the adjustable reactive power of the doubly-fed wind generator are calculated by the following method:
Figure BDA0002738088990000031
wherein Q is g_min Minimum value, Q, of adjustable reactive power for a doubly-fed wind generator g_max Maximum value, P, of the reactive power of a doubly-fed wind turbine can be adjusted g Active power, U, generated for doubly-fed wind machines s Is terminal voltage of the fan, X s Is the reactance value of the stator of the fan, S is the slip ratio of the doubly-fed wind motor, S wmax For fan grid side converter capacity, X m For fan excitation reactance value, I rmax The maximum current of the fan rotor.
Preferably: in step S3, the maximum value and the minimum value of the adjustable reactive power of the direct-drive wind turbine are calculated by the following method:
if the wind power plant does not consider the power factor limitation, the maximum value and the minimum value of the adjustable reactive power of the direct-drive wind turbine are as follows:
Figure BDA0002738088990000032
wherein S is w Is the rated capacity of the direct-drive fan converter,P zg active power is sent out for the fan;
if the wind power plant considers the limitation of power factors, the maximum value and the minimum value of the adjustable reactive power of the direct-drive wind turbine are as follows:
Figure BDA0002738088990000041
wherein
Figure BDA0002738088990000042
Is the power factor limit value of the wind farm,
Figure BDA0002738088990000043
the minimum value of the adjustable reactive power of the direct-drive wind turbine is obtained,
Figure BDA0002738088990000044
the minimum value of the reactive power of the direct-drive wind turbine can be adjusted.
Preferably: in step S3, the maximum value and the minimum value of the photovoltaic adjustable reactive power are calculated by the following method:
Figure BDA0002738088990000045
wherein Q is gmax For maximum value of the photovoltaic adjustable reactive power, Q gmin For the minimum value of the photovoltaic adjustable reactive power, P Sg Active power, U, output for photovoltaic power plants pcc For photovoltaic grid-connected point voltage, U dc For the voltage value of the DC bus of the photovoltaic grid-connected inverter, I rmax And the maximum current of the photovoltaic grid-connected inverter is represented by omega, the synchronous rotating speed is represented by omega, and the L is the filtering inductance value of the photovoltaic power generation output filter.
The invention has the beneficial effects that: according to the method, new energy of each node of the extra-high voltage alternating current-direct current power grid is considered, instead of the traditional method that reactive power regulation of the new energy is regarded as a fixed value, reactive voltage sensitivity of each new energy is accurately determined, and a corresponding new energy station is dispatched according to the sensitivity to perform reactive power support on the extra-high voltage alternating current-direct current power grid, so that reactive power requirements of the whole extra-high voltage direct current power grid can be met, and stability of the whole power grid can be ensured.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Fig. 2 is a diagram of reactive power versus active power.
Detailed Description
The present invention is described in detail in the following description, and it should be specifically noted that the following detailed description is only for the preferred embodiments of the present invention, and any modifications and equivalents of the technical solutions of the present invention by those skilled in the art are included in the scope of the technical solutions of the present application.
The invention provides a new energy reactive power support analysis method based on an extra-high voltage alternating current-direct current power grid, which comprises the following steps:
s1, acquiring a topological structure of an extra-high voltage alternating current-direct current power grid, and determining a power node in the topological structure;
s2, determining new energy types in the power nodes, wherein the new energy types comprise double-fed wind motor power generation, direct-drive wind motor power generation and photovoltaic power generation;
s3, calculating the maximum value and the minimum value of the adjustable reactive power of each new energy, and determining a voltage change value delta V of a power node bus when the adjustable reactive power of the new energy changes from the minimum value to the maximum value according to the load flow calculation model; wherein, the load flow calculation is the prior art, and the process is described herein;
s4, calculating the reactive voltage sensitivity delta of the new energy:
Figure BDA0002738088990000051
wherein Q is max Maximum value of adjustable reactive power, Q, for new energy min Is the minimum value of the adjustable reactive power of the new energy;
and S5, sequencing the reactive voltage sensitivity delta of each new energy of all the power nodes from large to small, and carrying out reactive power regulation on the extra-high voltage alternating current-direct current power grid according to the determined reactive voltage sensitivity delta sequencing sequence.
Specifically, the method comprises the following steps: in the reactive power support dispatching of extra-high voltage alternating current-direct current power grid to new energy station, need to consider two aspects of factor, first is reactive power's control range, and second is reactive voltage sensitivity, as follows:
after the reactive voltage sensitivities are sorted, the reactive voltage sensitivities are selected from the reactive voltage sensitivities from large to small, for example: the number of the power nodes is 3, A, B and C, each power node is provided with a new energy station and comprises double-fed fan power generation, direct-drive fan power generation and photovoltaic power generation, so that 9 reactive voltage sensitivity parameters exist in the three power nodes, for simplicity, the three power nodes adopt A1, A2, A3, B1, B2, B3, C1, C2 and C3 to represent 9 reactive voltage sensitivity parameters, wherein letters represent nodes, 1 represents a double-fed fan motor, 2 represents a direct-drive fan motor, and 3 represents photovoltaic power generation equipment; the calculated orders from large to small are (C3, B2, B1, A3, A1, C2, C1, A2 and B3), then a new energy station C3 with the highest reactive voltage sensitivity is selected firstly, namely the photovoltaic power generation equipment of a power node C is used as standby equipment for reactive support;
determining the reactive power adjusting range of each new energy station, namely, the difference between the maximum value and the minimum value of the adjustable reactive power, if the reactive power adjusting range of the photovoltaic power generation equipment of the node C is larger than a set value, selecting the photovoltaic equipment of the node C as reactive support equipment, if the reactive power adjusting range of the photovoltaic power generation equipment of the node C is smaller than the set value, selecting the new energy station corresponding to the second highest reactive voltage sensitivity B2 from the reactive voltage sensitivity sequence, namely, the direct-drive wind turbine corresponding to the node B, if the reactive power adjusting range of the direct-drive wind turbine is larger than the set value, determining the direct-drive wind turbine of the node B as the reactive support equipment of the extra-high voltage alternating-direct-current and direct-current power grid, and if the direct-drive wind turbine of the node B still does not meet the condition, analogizing in sequence according to the method, and finally determining the required equipment; if the reactive power of the direct-drive wind motor corresponding to the node B cannot meet the requirement of the whole extra-high voltage alternating current and direct current power grid, determining other equipment capable of meeting the requirement according to the method, for example, selecting the equipment corresponding to A3 and A1, and performing reactive support on the extra-high voltage alternating current and direct current power grid together, namely B2, A3 and A1; therefore, according to the method, new energy of each node of the extra-high voltage alternating current-direct current power grid is considered, instead of the traditional method that the reactive power regulation of the new energy is regarded as a fixed value, the reactive voltage sensitivity of each new energy is accurately determined, and the corresponding new energy station is dispatched according to the sensitivity to perform reactive power support on the extra-high voltage alternating current-direct current power grid, so that the reactive power requirement of the whole extra-high voltage direct current power grid can be met, excessive equipment can be prevented from being involved in the reactive power support, and the stability of the whole power grid is ensured.
In a preferred embodiment, in step S3, the maximum and minimum adjustable reactive powers of the doubly-fed wind turbine are calculated by the following method:
Figure BDA0002738088990000071
wherein Q is g_min Minimum value, Q, of adjustable reactive power for a doubly-fed wind generator g_max Maximum value, P, of the reactive power of a doubly-fed wind turbine can be adjusted g Active power, U, generated for doubly-fed wind machines s Is terminal voltage of the fan, X s Is the reactance value of the stator of the fan, S is the slip ratio of the doubly-fed wind motor, S wmax For fan grid side converter capacity, X m For fan excitation reactance value, I rmax The maximum current of the fan rotor.
In step S3, the maximum value and the minimum value of the adjustable reactive power of the direct-drive wind turbine are calculated by the following method:
if the wind power plant does not consider the power factor limitation, the maximum value and the minimum value of the adjustable reactive power of the direct-drive wind turbine are as follows:
Figure BDA0002738088990000072
wherein S is w Rated capacity, P, of a direct drive fan converter zg Active power is sent out for the fan;
if the wind power plant considers the limitation of power factors, the maximum value and the minimum value of the adjustable reactive power of the direct-drive wind turbine are as follows:
Figure BDA0002738088990000081
wherein
Figure BDA0002738088990000082
Is the power factor limit value of the wind farm,
Figure BDA0002738088990000083
the minimum value of the adjustable reactive power of the direct-drive wind turbine is obtained,
Figure BDA0002738088990000084
the minimum value of the reactive power of the direct-drive wind turbine can be adjusted.
In step S3, the maximum value and the minimum value of the photovoltaic adjustable reactive power are calculated by the following method:
Figure BDA0002738088990000085
wherein Q is gmax For maximum value of the photovoltaic adjustable reactive power, Q gmin Minimum value of photovoltaic-adjustable reactive power, P Sg Active power, U, for photovoltaic power plant output pcc For photovoltaic grid-connected point voltage, U dc Is the DC bus voltage value, I, of the photovoltaic grid-connected inverter rmax And the maximum current of the photovoltaic grid-connected inverter is represented by omega, the synchronous rotating speed is represented by omega, and the L is the filtering inductance value of the photovoltaic power generation output filter.
Under the method, the reactive power regulation range of each new energy station can be accurately determined, and the accuracy of reactive voltage sensitivity can be ensured.

Claims (4)

1. A new energy reactive power support analysis method based on an extra-high voltage alternating current-direct current power grid is characterized by comprising the following steps: the method comprises the following steps:
s1, acquiring a topological structure of an extra-high voltage alternating current and direct current power grid, and determining a power node in the topological structure;
s2, determining new energy types in the power node, wherein the new energy types comprise double-fed wind motor power generation, direct-drive wind motor power generation and photovoltaic power generation;
s3, calculating the maximum value and the minimum value of the adjustable reactive power of each new energy, and determining a voltage change value delta V of a power node bus when the adjustable reactive power of the new energy is changed from the minimum value to the maximum value according to the load flow calculation model;
s4, calculating reactive voltage sensitivity delta of the new energy:
Figure FDA0003725924880000011
wherein Q is max Is the maximum value of the adjustable reactive power of the new energy, Q min Is the minimum value of the adjustable reactive power of the new energy;
and S5, sequencing the reactive voltage sensitivity delta of each new energy of all the power nodes from large to small, and carrying out reactive power regulation on the extra-high voltage alternating current-direct current power grid according to the determined reactive voltage sensitivity delta sequencing sequence.
2. The new energy reactive power support analysis method based on the extra-high voltage alternating current-direct current power grid according to claim 1, characterized by comprising the following steps of: in step S3, the maximum and minimum adjustable reactive powers of the doubly-fed wind generator are calculated by the following method:
Figure FDA0003725924880000012
wherein Q g_min Reactive power adjustable for doubly-fed wind generatorsMinimum value, Q g_max Maximum value, P, of the reactive power of a doubly-fed wind turbine can be adjusted g Active power, U, generated for doubly-fed wind machines s Is terminal voltage of the fan, X s Is the reactance value of the stator of the fan, S is the slip ratio of the doubly-fed wind motor, S wmax For fan grid side converter capacity, X m For fan excitation reactance value, I rmax The maximum current of the fan rotor.
3. The new energy reactive power support analysis method based on the extra-high voltage alternating current-direct current power grid according to claim 1, characterized by comprising the following steps of: in step S3, the maximum value and the minimum value of the adjustable reactive power of the direct-drive wind turbine are calculated by the following method:
if the wind power plant does not consider the power factor limitation, the maximum value and the minimum value of the adjustable reactive power of the direct-drive wind turbine are as follows:
Figure FDA0003725924880000021
wherein S is w Rated capacity, P, of a direct drive fan converter zg Active power is sent out for the fan;
if the wind power plant considers the limitation of power factors, the maximum value and the minimum value of the adjustable reactive power of the direct-drive wind turbine are as follows:
Figure FDA0003725924880000022
wherein
Figure FDA0003725924880000023
Is the power factor limit value of the wind farm,
Figure FDA0003725924880000024
the minimum value of the adjustable reactive power of the direct-drive wind turbine is obtained,
Figure FDA0003725924880000025
the minimum value of the reactive power of the direct-drive wind turbine can be adjusted.
4. The new energy reactive power support analysis method based on the extra-high voltage alternating current-direct current power grid according to claim 1, characterized by comprising the following steps of: in step S3, the maximum value and the minimum value of the photovoltaic adjustable reactive power are calculated by the following method:
Figure FDA0003725924880000031
wherein Q is gmax For maximum value of the photovoltaic adjustable reactive power, Q gmin Minimum value of photovoltaic-adjustable reactive power, P Sg Active power, U, output for photovoltaic power plants pcc For photovoltaic grid-connected point voltage, U dc Is the DC bus voltage value, I, of the photovoltaic grid-connected inverter rmax And the maximum current of the photovoltaic grid-connected inverter is represented by omega, the synchronous rotating speed is represented by omega, and the L is the filtering inductance value of the photovoltaic power generation output filter.
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