CN104319781B - On-Line Voltage containing VSC-HVDC electrical network stablizes inflation method - Google Patents

On-Line Voltage containing VSC-HVDC electrical network stablizes inflation method Download PDF

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Publication number
CN104319781B
CN104319781B CN201410652974.8A CN201410652974A CN104319781B CN 104319781 B CN104319781 B CN 104319781B CN 201410652974 A CN201410652974 A CN 201410652974A CN 104319781 B CN104319781 B CN 104319781B
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voltage
node
reactive
electrical network
weak
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CN104319781A (en
Inventor
蔡小玲
刘仁和
张继芬
黄旭峰
黄卫平
彭传相
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Fujian Electric Power Co Ltd
PowerChina Fujian Electric Power Engineering Co Ltd
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Fujian Electric Power Co Ltd
Fujian Electric Power Survey and Design Institute
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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
    • H02J3/12—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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The present invention provides a kind of on-Line Voltage containing VSC-HVDC electrical network to stablize inflation method, it is characterised in that, comprise following step: step one: certainty annuity voltage stablizes weak link; Step 2, thin spot is sorted, it is determined that need the thin spot that regulates and voltage-regulation target; Step 3, sensitivity analysis, try to achieve certain the most effective control method of weak link, line ordering of going forward side by side; Step 4: according to step 3 sensitivity analysis result, VSC-HVDC system converter station is carried out voltage of alternating current control, preferentially to the L of most weak nodeQkiMaximum circuit carries out reactive-load compensation, until each node voltage reaches voltage-regulation target, and last generating mode adjustable strategies; If step 5 voltage meets requirement, then terminate on-Line Voltage adjustment; Otherwise then return step one. The method considers the stable adjustment of the voltage under normal way and fault mode simultaneously, flexible direct current equipment operation scheme arrangement is provided and more fully advises.

Description

On-Line Voltage containing VSC-HVDC electrical network stablizes inflation method
Technical field
The present invention relates to the on-Line Voltage of a kind of electrical network and stablize inflation method, particularly a kind of on-Line Voltage containing VSC-HVDC electrical network stablizes inflation method.
Background technology
On-Line Voltage Stability Assessment belongs to the category that Small disturbance voltage stability is analyzed, and on-Line Voltage stability analysis relates to differentiation and the voltage stability limit calculating of voltage stability. Voltage stability often shows as a kind of local phenomenon, and voltage unstability always causes from the node that system voltage stabilizes is the weakest, and gradually to comparing weak node around, region spread, just can cause the voltage collapse of whole system time serious. Therefore, dispatching of power netwoks being run personnel, is extremely concerned about key node under heavy loading and critical area, key node comprises critical load node and key power generator node. The stable nargin of the system that in prior art, technician is generally drawn by voltage stability limit judges, but stablize the general indices that nargin is only system, when the system that can not provide arrives voltage stability limit under certain transient mode, which point there is voltage unstability from, thus corresponding prevention of accidents measure can not be provided.
Flexible direct current equipment, as a kind of novel appts, is promoted because of its peculiar advantage: meritorious and wattless power can be carried out completely independent control by flexible direct current power transmission system in its operating range; Two ends current conversion station can completely absorb and send specified wattless power, by receive direct wattless power instruction or according to exchange electrical network voltage horizontal adjustment its send or absorbing reactive power. It is therefore desirable to on-Line Voltage containing VSC-HVDC electrical network adjusts under considering normal way and fault mode simultaneously, facilitate its operation scheme arrangement to be provided and more fully advises.
Summary of the invention
It is an object of the invention to provide a kind of on-Line Voltage containing VSC-HVDC electrical network and stablize inflation method.
The present invention adopts following scheme to realize, and the on-Line Voltage containing VSC-HVDC electrical network stablizes inflation method, it is characterised in that, comprise the following steps: step one: the index V calculating the local reactive loss of each node kQk; Step 2: to local reactive loss index VQkNumerical value sort, VQkValue more big, illustrate that this node is more weak, from most weak node, carry out sensitivity analysis; Step 3: carry out sensitivity LQkiAnalyze; Step 4: according to step 3 sensitivity analysis result, calculates the adjustment amount of each equipment in power system, preferentially to the L of most weak nodeQkiMaximum circuit carries out reactive-load compensation, until each node voltage reaches voltage-regulation target, and last generating mode adjustable strategies; Step 5: re-start voltage stability Calculation, if voltage meets power system voltage stabilization requirement, then end voltage adjustment; Otherwise return step one.
In an embodiment of the present invention, the reactive-load compensation in described step 4 is by carrying out voltage of alternating current control to VSC-HVDC system converter station, or adjustment generator reactive exerts oneself shunt capacitance reactor and load tap changer, realizes on-Line Voltage adjustment.
In an embodiment of the present invention, the reactive-load compensation in described step 4 is by carrying out voltage of alternating current control to VSC-HVDC system converter station, or adjustment generator reactive exerts oneself shunt capacitance reactor and load tap changer, realizes on-Line Voltage adjustment.
In an embodiment of the present invention, based on the target function of local reactive loss in described step one:WhereinFor the summation of the reactive loss of each circuit being connected with node k, n is each circuit sum being connected with node k,For the reactive-load compensation summation on node k and each node directly adjacent with node k, m is the sum of each circuit on each node directly adjacent with node k.
In an embodiment of the present invention, in described step 3, sensitivity analysis index is:Wherein UkFor bus k voltage, dUkFor bus k voltage change rate, QlossiFor the reactive loss of a wherein loop line road i being connected with bus k, dQlossiFor QlossiReactive loss velocity of variation, sensitivity LQkiSort from big to small, first to the L of most weak nodeQkiMaximum circuit carries out reactive-load compensation.
Method provided by the invention considers under normal way and fault mode that the on-Line Voltage containing VSC-HVDC electrical network adjusts simultaneously, convenient arrange to provide to flexible DC power transmission (VSC-HVDC) system cloud gray model mode more fully advises.
Accompanying drawing explanation
The on-Line Voltage that Fig. 1 contains VSC-HVDC electrical network stablizes inflation method schema.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described. The present invention provides a kind of on-Line Voltage containing VSC-HVDC electrical network to stablize inflation method. Idiographic flow is with reference to figure 1.
Step one: certainty annuity voltage stablizes weak link, analyzes mainly for load point.
Step 2: thin spot is sorted, it is determined that need thin spot and the voltage-regulation target of adjustment.
Step 3: sensitivity analysis, tries to achieve certain the most effective control method of weak link, line ordering of going forward side by side.
Step 4: according to step 3 sensitivity analysis result, VSC-HVDC system converter station is carried out voltage of alternating current control, or adjustment generator reactive is exerted oneself, shunt capacitance reactor and load tap changer, preferentially to the L of most weak nodeQkiMaximum circuit carries out reactive-load compensation, until each node voltage reaches voltage-regulation target, and last generating mode adjustable strategies;
Step 5: re-start voltage stability Calculation. If voltage meets requirement, then terminate on-Line Voltage adjustment; Otherwise then return step one.
In a particular embodiment of the present invention, being specifically operating as of each step:
Step one: certainty annuity voltage stablizes weak link, analyzes mainly for load point.
Due to system loading increase time, transmitting line reactive loss also increases simultaneously, and the increase of reactive requirement can cause the decline of system voltage usually, thus determines the weak circuit in node.
When power system is in fully loaded transportation condition, through-put power and merit angle are relatively big, and the reactive loss on circuit is also bigger. Theoretical analysis and practical operating experiences show, if the merit angle difference of sending end and receiving end is more than 30 ��, the idle of sending end can not be sent to receiving end.
Due to idle can not long range propagation, it is necessary to local compensation. Therefore when the reactive loss on a certain node has exceeded the reactive-load compensation summation of near region electrical network, the decline of this node voltage will be caused. On this basis, node reactive loss index is applied to on-Line Voltage stabilization aid decision-making, has invented the real time evaluating method of voltage stability based on local reactive loss index. The method calculates simple, the voltage stability of energy rapid evaluation electrical network. The reactive loss index of the whole network node is carried out scanning and calculates by application the method, it is possible to find voltage stability weak node in electrical network.
The target function of the local reactive loss of node k is defined as follows shown in formula (1):
V Qk = Σ i = 1 n Q lossi Σ j = 0 m Q Cj - - - ( 1 )
WhereinFor the summation of the reactive loss of each circuit being connected with node k, n is circuit sum;For the reactive-load compensation summation on node k and each node directly adjacent with node k, comprising the reactive-load compensation of each circuit on each node directly adjacent with node k by node side, m is the sum of each circuit on each node directly adjacent with node k. VQkValue more big, show that the reactive reserve of the near region electrical network of node k is more few, occur voltage unstability possibility more high, illustrate that this node is more weak.
Step 2: weak link is sorted.
To local reactive loss index VQkNumerical value sort, the weak situation of each node voltage can be obtained. VQkValue more big, illustrate that this node is more weak, from the weakest node, carry out sensitivity analysis.
Step 3: carry out sensitivity analysis, tries to achieve line ordering of being gone forward side by side by certain the most effective control method of weak link.
Sensitivity analysis adopt index be: each bus voltage to each circuit reactive loss velocity of variation, i.e. voltage-reactive loss sensitivity, its expression formula is such as formula shown in (2)
L Qki = dU k dQ lossi - - - ( 2 )
Wherein UkFor bus k voltage, dUkFor bus k voltage change rate, QlossiFor the reactive loss of a wherein loop line road i being connected with bus k, dQlossiFor QlossiReactive loss velocity of variation, sensitivity LQkiMore big, represent that the reactive loss of circuit i is more big on the impact of the node voltage of bus k, illustrate that to carry out reactive-load compensation on circuit i the most effective to the Voltage Cortrol of bus k.
By sensitivity LQkiSort from big to small, first to LQkiMaximum circuit carries out reactive-load compensation.
Step 4: according to step 3 sensitivity analysis result, flexible DC power transmission (VSC-HVDC) system converter station is carried out voltage of alternating current control, or adjustment generator reactive is exerted oneself (or extreme voltage setting value), shunt capacitance reactor and load tap changer, preferentially to the L of most weak nodeQkiMaximum circuit carries out reactive-load compensation, until each node voltage reaches voltage-regulation target, and last generating mode adjustable strategies.
Step 5: re-start voltage stability Calculation, if voltage meets power system voltage stabilization requirement, then terminates on-Line Voltage adjustment; Otherwise then return step one.
Wherein, the voltage of step one stablizes the sensitivity analysis of thin spot identification and step 3, is the key link of on-Line Voltage adjustment.
The present invention's provide inflation method to meet requirement that the on-Line Voltage comprising VSC-HVDC electrical network stablizes adjustment, and ensure that electrical network voltage meets operating requirement. The method considers the stable adjustment of the voltage under normal way and fault mode simultaneously, flexible direct current equipment operation scheme arrangement is provided and more fully advises.
Finally bright, the foregoing is only the better embodiment of the present invention, all impartial changes done according to the present patent application patent scope, with modifying, all should belong to the covering scope of patent of the present invention.

Claims (3)

1. the on-Line Voltage containing VSC-HVDC electrical network stablizes inflation method, it is characterised in that, comprise the following steps:
Step one: the index V calculating the local reactive loss of each node kQk;
Step 2: to local reactive loss index VQkNumerical value sort, VQkValue more big, illustrate that this node is more weak, from most weak node, carry out sensitivity analysis;
Step 3: carry out sensitivity LQkiAnalyze;
Step 4: according to step 3 sensitivity analysis result, calculates the adjustment amount of each equipment in power system, preferentially to the L of most weak nodeQkiMaximum circuit carries out reactive-load compensation, until each node voltage reaches voltage-regulation target, and last generating mode adjustable strategies;
Step 5: re-start voltage stability Calculation, if voltage meets power system voltage stabilization requirement, then end voltage adjustment; Otherwise return step one;
Based on the target function of local reactive loss in described step one:WhereinFor the summation of the reactive loss of each circuit being connected with node k, n is each circuit sum being connected with node k,For the reactive-load compensation summation on node k and each node directly adjacent with node k, m is the sum of each circuit on each node directly adjacent with node k.
2. the on-Line Voltage containing VSC-HVDC electrical network according to claim 1 stablizes inflation method, it is characterized in that: the reactive-load compensation in described step 4 is by carrying out voltage of alternating current control to VSC-HVDC system converter station, or adjustment generator reactive is exerted oneself, shunt capacitance reactor and load tap changer, realizes on-Line Voltage adjustment.
3. the on-Line Voltage containing VSC-HVDC electrical network according to claim 1 stablizes inflation method, it is characterised in that: in described step 3, sensitivity analysis index is:Wherein UkFor bus k voltage, dUkFor bus k voltage change rate, QlossiFor the reactive loss of a wherein loop line road i being connected with bus k, dQlossiFor QlossiReactive loss velocity of variation, sensitivity LQkiSort from big to small, first to the L of most weak nodeQkiMaximum circuit carries out reactive-load compensation.
CN201410652974.8A 2014-11-17 2014-11-17 On-Line Voltage containing VSC-HVDC electrical network stablizes inflation method Active CN104319781B (en)

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CN106410812A (en) * 2016-08-30 2017-02-15 上海交通大学 Network voltage out-of-limit adjusting method for use after access of ultrahigh voltage
CN107093903A (en) * 2017-06-28 2017-08-25 华北电力大学（保定） A kind of utilization STATCOM improves the control method of HVDC alternating current filter switching performances
CN112039082B (en) * 2020-08-28 2022-04-22 国网青海省电力公司果洛供电公司 Power distribution network low-voltage regulation equipment optimal configuration method and system based on minimum loss
CN113013885B (en) * 2021-04-23 2021-08-27 山东国瑞电力科技有限公司 Reactive power optimization method and system based on power grid weak points

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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing

Co-patentee after: State Grid Fujian Electric Power Co., Ltd.

Patentee after: State Grid Corporation of China

Co-patentee after: Economic technology academy of State Grid Fujian Electric Power Co., Ltd.

Co-patentee after: China Electric Power Construction Group Fujian electric survey and Design Institute Co., Ltd.

Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing

Co-patentee before: State Grid Fujian Electric Power Co., Ltd.

Patentee before: State Grid Corporation of China

Co-patentee before: Economic technology academy of State Grid Fujian Electric Power Co., Ltd.

Co-patentee before: Fujian Electric Power Survey and Design Institute