CN106058876A - Dynamic reactive planning site-selection analysis method and system considering transient voltage stability - Google Patents

Abstract

The invention discloses a dynamic reactive planning site-selection analysis method and system considering transient voltage stability. The dynamic reactive planning site-selection analysis method comprises the steps of obtaining related data of a power grid firstly; then performing simulation analysis on the transient voltage stability of the power grid, analyzing the power grid faults to determine a transient voltage instability fault set, and dividing the transient voltage instability fault set into multiple transient voltage stable weak regions; next, calculating the dynamic reactive compensation sensitivity under each fault state, and determining the number and locations of the to-be-compensated points of one of the power grid fault weak region through a panning site-location combinational analysis method; and finally, outputting the position scheme of the dynamic reactive planning site-selection to-be-selected points of all the transient voltage stable weak regions. Compared with the prior art, the dynamic reactive planning site-selection analysis method and system are suitable for dynamic reactive planning site-selection in the alternating current/direct current hybrid power grid, have the advantages of high efficiency, simplicity, tight combination with engineering and the like; and in addition, the redundancy of the dynamic reactive planning site-selection to-be-selected compensation points can be effectively prevented.

Description

Consider that the dynamic reactive Site Selection of Enhancement of Transient Voltage Stability analyzes method and system

Technical field

The present invention relates to a kind of reactive-load compensation site selecting method, be specifically related to a kind of dynamic nothing considering Enhancement of Transient Voltage Stability Merit Site Selection analyzes method and system, belongs to power system reactive power compensation technical field.

Background technology

The direct current transportation of China has been provided with certain scale, extra-high-voltage alternating current also greatly develop and successively build in, Build up a plurality of extra-high-voltage alternating current engineering that put into operation (such as southeast Shanxi-extra-high-voltage alternating current work such as Nanyang-Jingmen, Huainan-Hu Xi Journey), the region rack such as China East China, south China is complex, and load growth is than very fast, and has a plurality of extra-high voltage to access, with The development following electrical network has bigger challenge to the Enhancement of Transient Voltage Stability in such load center region.Straight in order to strengthen friendship The Enhancement of Transient Voltage Stability in stream series-parallel connection area, can account for the dynamic of Enhancement of Transient Voltage Stability at Transient Voltage Stability weakness zone Planning that state is idle, determines number of nodes to be compensated and the position of weakness zone, to improve system moving after grid collapses The enabling capabilities that state is idle.

In the dynamic reactive Site Selection analysis improving power system transient stability, core is to propose reflection electrical network event The Transient Voltage Stability index of recovery capability after barrier, and set up consider Enhancement of Transient Voltage Stability dynamic reactive Site Selection divide Analysis method.The most more to the research of Network Voltage Stability, wherein, the research to static electric voltage stability is the most ripe, often Static voltage stability index mainly have the methods such as PV curve method, sensitivity index, modal idenlification method.But only rely on Static Electro Pressure stability carries out research to the voltage stabilization weakness zone of electrical network and has certain limitation, current research it is also proposed some temporarily State voltage stability index, wherein, after fault, Voltage Drop index can reflect the transient recovery ability of electrical network, during maximum fault clearance Between index can assess the maximum duration that operation of power networks is under fault, these indexs are by topological structure of electric and the shadow of control system Ring relatively big, there is certain limitation.Additionally, energy function method can be used to assess electrical network voltage stability after a failure, but Owing to the method structure energy function method is relatively difficult, therefore energy function method also needs in the assessment of Enhancement of Transient Voltage Stability More research.In order to accurately reflect the recovery capability after grid collapses more comprehensively, novel transient voltage is proposed steady Determine index to have great importance.

Summary of the invention

In order to overcome the deficiency of above technology, the technical problem to be solved there are provided a kind of consideration transient state The dynamic reactive Site Selection of voltage stability analyzes method and system.

The present invention solves its technical problem and is adopted the technical scheme that: consider the dynamic reactive rule of Enhancement of Transient Voltage Stability Draw siting analysis method, it is characterized in that, comprise the following steps:

Step 1: obtaining the related data of electrical network, the related data of electrical network includes DC transmission system, dynamic passive compensation The transient state parameter of device and electromotor and control system parameter thereof；

Step 2: the Enhancement of Transient Voltage Stability of electrical network is carried out simulation analysis, is analyzed determining transient state by electric network fault Voltage Instability failure collection, is designated asAnd according toDistribution the electrical network broken down is divided into several transient voltages Stablize weakness zone；

Step 3: the fault of Transient Voltage Stability weakness zone is analyzed one by one, and calculate under each malfunction Dynamic passive compensation sensitivity, utilizes Site Selection combined analytical method to determine the to be compensated of one of them electric network fault weakness zone The number of point and position, if 1 compensation point cannot meet steady demand, then need 2 the most multiple compensation points combinations right Weakness zone carries out reactive-load compensation；

Step 4: the most complete to the dynamic reactive Site Selection analysis of all Transient Voltage Stability weakness zones, if The dynamic reactive Site Selection then exporting all Transient Voltage Stability weakness zones treats reconnaissance location schemes, otherwise forwards step 3 to Continue the Site Selection analysis to next weakness zone, until the dynamic reactive of all Transient Voltage Stability weakness zones is planned Till siting analysis is complete.

Described failure collection includes generator failure, extra-high-voltage alternating current fault, extra-high voltage direct-current transmission fault and circuit event Barrier.

Described dynamic passive compensation sensitivity includes the compensation sensitivity recovering index TVRI based on transient voltageWith Compensation sensitivity based on transient voltage fluctuation index TVFI

Described compensation sensitivityCalculating process comprise the following steps:

(11) transient voltage recovery index TVRI is defined as:

${\mathrm{TVRI}}_i^{F_k}={\∫}_{t_{cl}}^{t_c}\frac{|U_{t,i}-U_{i0}|}{U_{i0}}dt---\left(1\right)$

In formula: U_t,iFor the transient voltage in t node i；U_i0For the voltage under node i nominal situation；t_cExtensive for transient state Deadline during Fu；F_kFault type for electrical network；Wherein, For failure collection；

(12) failure collectionIt is expressed as:

In formula: R_G, R_UHV, R_HVDC, R_BRRepresent generator failure set, extra-high-voltage alternating current failure collection, direct current transportation respectively Failure collection and line fault set；

(13) it is its difference definition by the TVRI index expression of formula (1):

${\mathrm{TVRI}}_i^{F_k}=\underset{F_k,t\∈\[t_{cl},t_c\]}{\Σ}\frac{|U_{t,i}-U_{i0}|}{U_{i0}}{t}_s---\left(3\right)$

In formula: t_sMaterial calculation in analyzing for time-domain-simulation；

(14) useArbitrary node in electrical network is calculated, can show that overall situation transient voltage recovers index and is:

${\mathrm{TVRI}}_s^{F_k}=\max \left({\mathrm{TVRI}}_i^{F_k}\right)=\max \left(\underset{F_k,t\∈\[t_{cl},t_c\]}{\Σ}\frac{|U_{t,i}-U_{i0}|}{U_{i0}}{t}_s\right)---\left(4\right)$

From formula (4), overall situation transient voltage recovers indexBy all nodes in assessment area? It is worth greatly decision；

Compensation sensitivity table based on TVRI index is shown as:

$S_{{\mathrm{TVRI}}_s}^{F_k}=\frac{\∂{\mathrm{TVRI}}_s^{F_k}}{\∂Q_{svc}}---\left(7\right)$

Formula (7) is converted into:

$S_{{\mathrm{TVRI}}_s}^{F_k}=\frac{{\mathrm{\ΔTVRI}}_s^{F_k}}{{\mathrm{\ΔQ}}_{svc}}---\left(8\right)$

In formula: TVRI_sCan be solved by formula (4), Q_SVCFor reactive compensation capacity.

Described compensation sensitivityCalculating process comprise the following steps:

(21) transient voltage fluctuation index TVFI is defined as:

${\mathrm{TVFI}}_i^{F_k}=\frac{1}{2}\left(\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\max }^{F_k,N_p}-\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\min }^{F_k,N_p}\right)---\left(5\right)$

In formula: N_TCycle for transient state time-domain-simulation；N_pFor pth after electric network fault_thSecondary cycle；Point Wei F_kFault lower node i is at N_pThe minimum and maximum voltage of cycle；

(22) useArbitrary node in electrical network is calculated, can show that transient voltage fluctuation index is:

${\mathrm{TVFI}}_s^{F_k}=max\left({\mathrm{TVFI}}_i^{F_k}\right)=max\left(\frac{1}{2}\right(\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\max }^{F_k,N_p}-\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\min }^{F_k,N_p}\left)\right)---\left(6\right)$

(23) compensation sensitivity table based on TVFI index is shown as:

$S_{{\mathrm{TVFI}}_s}^{F_k}=\frac{\∂{\mathrm{TVFI}}_s^{F_k}}{\∂Q_{svc}}---\left(9\right)$

Formula (9) is reduced to:

$S_{{\mathrm{TVFI}}_s}^{F_k}=\frac{{\mathrm{\ΔTVFI}}_s^{F_k}}{{\mathrm{\ΔQ}}_{svc}}---\left(10\right)$

In formula: TVFI_sCan be solved by formula (6), Q_SVCFor reactive compensation capacity.

Described Site Selection combined analytical method comprises the following steps:

(1) utilize time-domain simulation program that the Enhancement of Transient Voltage Stability of the whole network is emulated and analyzed, and according to existing temporarily The failure collection of state voltage stabilization sex chromosome mosaicism is divided into several weakness zones；

(2) for each Transient Voltage Stability weakness zone, optional one or more points to be selected compensate, planning choosing The principle of location is the Enhancement of Transient Voltage Stability utilizing minimum compensation point to improve system；

(3) to the failure collection in each region of Transient Voltage Stability weakness zone based on described compensation sensitivity by Individual calculate and analyze, if 1 dynamic reactive compensation device can not solve the problem of Enhancement of Transient Voltage Stability, then need with 2 Platform even more multiple stage dynamic reactive compensation device compensates；

(4) based on dynamic passive compensation sensitivity, the addressing position of each weakness zone is calculated and screens, finally Show that the dynamic reactive Site Selection of all Transient Voltage Stability weakness zones treats reconnaissance location schemes, to improve the transient state of the whole network Voltage stability.

The related data of described electrical network directly obtains or by input equipment typing from network system.

Present invention also offers a kind of dynamic reactive Site Selection considering Enhancement of Transient Voltage Stability and analyze system, its feature It is, including:

Data acquisition module, in order to obtain the related data of electrical network, the related data of electrical network includes DC transmission system, moves The transient state parameter of state reactive power compensator and electromotor and control system parameter thereof；

Simulation analysis module, in order to the Enhancement of Transient Voltage Stability of electrical network is carried out simulation analysis, is carried out by electric network fault Analysis determines transient voltage unstability failure collection, is designated as

Region divides module, in order to basisThe electrical network that just breaks down of distribution be divided into several transient voltages Stablize weakness zone；

Siting analysis module, in order to analyze the fault of Transient Voltage Stability weakness zone one by one, and calculates each Dynamic passive compensation sensitivity under malfunction, one of them electric network fault is weak to utilize Site Selection combined analytical method to determine The number of the point to be compensated in region and position, if 1 compensation point cannot meet steady demand, then need 2 the most multiple Compensation point combination carries out reactive-load compensation to weakness zone；

Output module, treats dot position in order to export the dynamic reactive Site Selection of all Transient Voltage Stability weakness zones Scheme.

Described failure collection includes generator failure, extra-high-voltage alternating current fault, extra-high voltage direct-current transmission fault and circuit event Barrier.

Described siting analysis module includes dynamic passive compensation Calculation of Sensitivity module and Site Selection combinative analysis module.

Described dynamic passive compensation Calculation of Sensitivity module recovers the compensation of index TVRI in order to calculate based on transient voltage SensitivityWith compensation sensitivity based on transient voltage fluctuation index TVFI

Described compensation sensitivityCalculating process comprise the following steps:

(11) transient voltage recovery index TVRI is defined as:

${\mathrm{TVRI}}_i^{F_k}={\∫}_{t_{cl}}^{t_c}\frac{|U_{t,i}-U_{i0}|}{U_{i0}}dt---\left(1\right)$

In formula: U_t,iFor the transient voltage in t node i；U_i0For the voltage under node i nominal situation；t_cExtensive for transient state Deadline during Fu；F_kFault type for electrical network；Wherein, For failure collection；

(12) failure collectionIt is expressed as:

In formula: R_G, R_UHV, R_HVDC, R_BRRepresent generator failure set, extra-high-voltage alternating current failure collection, direct current transportation respectively Failure collection and line fault set；

(13) it is its difference definition by the TVRI index expression of formula (1):

${\mathrm{TVRI}}_i^{F_k}=\underset{F_k,t\∈\[t_{cl},t_c\]}{\Σ}\frac{|U_{t,i}-U_{i0}|}{U_{i0}}{t}_s---\left(3\right)$

In formula: t_sMaterial calculation in analyzing for time-domain-simulation；

(14) useArbitrary node in electrical network is calculated, can show that overall situation transient voltage recovers index and is:

${\mathrm{TVRI}}_s^{F_k}=\max \left({\mathrm{TVRI}}_i^{F_k}\right)=\max \left(\underset{F_k,t\∈\[t_{cl},t_c\]}{\Σ}\frac{|U_{t,i}-U_{i0}|}{U_{i0}}{t}_s\right)---\left(4\right)$

From formula (4), overall situation transient voltage recovers indexBy all nodes in assessment area? It is worth greatly decision；

Compensation sensitivity table based on TVRI index is shown as:

$S_{{\mathrm{TVRI}}_s}^{F_k}=\frac{\∂{\mathrm{TVRI}}_s^{F_k}}{\∂Q_{svc}}---\left(7\right)$

Formula (7) is converted into:

$S_{{\mathrm{TVRI}}_s}^{F_k}=\frac{{\mathrm{\ΔTVRI}}_s^{F_k}}{{\mathrm{\ΔQ}}_{svc}}---\left(8\right)$

In formula: TVRI_sCan be solved by formula (4), Q_SVCFor reactive compensation capacity；

Described compensation sensitivityCalculating process comprise the following steps:

(21) transient voltage fluctuation index TVFI is defined as:

${\mathrm{TVFI}}_i^{F_k}=\frac{1}{2}\left(\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\max }^{F_k,N_p}-\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\min }^{F_k,N_p}\right)---\left(5\right)$

In formula: N_TCycle for transient state time-domain-simulation；N_pFor pth after electric network fault_thSecondary cycle；Point Wei F_kFault lower node i is at N_pThe minimum and maximum voltage of cycle；

(22) useArbitrary node in electrical network is calculated, can show that transient voltage fluctuation index is:

${\mathrm{TVFI}}_s^{F_k}=max\left({\mathrm{TVFI}}_i^{F_k}\right)=max\left(\frac{1}{2}\right(\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\max }^{F_k,N_p}-\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\min }^{F_k,N_p}\left)\right)---\left(6\right)$

(23) compensation sensitivity table based on TVFI index is shown as:

$S_{{\mathrm{TVFI}}_s}^{F_k}=\frac{\∂{\mathrm{TVFI}}_s^{F_k}}{\∂Q_{svc}}---\left(9\right)$

Formula (9) is reduced to:

$S_{{\mathrm{TVFI}}_s}^{F_k}=\frac{{\mathrm{\ΔTVFI}}_s^{F_k}}{{\mathrm{\ΔQ}}_{svc}}---\left(10\right)$

In formula: TVFI_sCan be solved by formula (6), Q_SVCFor reactive compensation capacity.

The Enhancement of Transient Voltage Stability of the whole network is entered by described Site Selection combinative analysis module first with time-domain simulation program Row emulation and analysis, and it is divided into several weakness zones according to the failure collection that there is Enhancement of Transient Voltage Stability problem；For Each Transient Voltage Stability weakness zone, optional one or more points to be selected compensate, and the principle of Site Selection is for utilizing Minimum compensation point improves the Enhancement of Transient Voltage Stability of system；Fault set to each region of Transient Voltage Stability weakness zone Close and calculate one by one based on described compensation sensitivity and analyze, if 1 dynamic reactive compensation device can not solve transient state electricity The problem of pressure stability, then need to compensate with 2 even more multiple stage dynamic reactive compensation devices；Mend based on dynamic reactive Repay sensitivity the addressing position of each weakness zone is calculated and screened, finally draw all Transient Voltage Stability weak areas The dynamic reactive Site Selection in territory treats reconnaissance location schemes, to improve the Enhancement of Transient Voltage Stability of the whole network.

Described data acquisition module directly obtains the related data of electrical network or by input equipment typing from network system The related data of electrical network.

The invention has the beneficial effects as follows: it is temporary that the present invention is divided into several according to the distribution of transient voltage unstability failure collection State voltage stabilization weakness zone, by reactive-load compensation Site Selection is solved in advance as a subproblem, the most right Dynamic reactive planning problem is simplified；TVRI and the TVFI index proposed Transient Voltage Stability assessment after fault is suitable Relatively strong by property, the dynamic passive compensation sensitivity under faultOrCalculate more simple, the dynamic passive compensation of foundation Site Selection combined analysis method is practical, compared with prior art, and the present invention moving be applicable to AC-DC hybrid power grid In Site Selection problem that state is idle, there is high-efficient simple and engineering such as is combined closely at the advantage, and can effectively prevent dynamic reactive The redundancy of Site Selection compensation point to be selected.

The present invention can solve consider Enhancement of Transient Voltage Stability idle planning problem compensate position recently, utilize time domain imitate The transient voltage unstability region of true software analysis system, and use idle Site Selection combined method to the optimal compensation point quantity and position Put and be analyzed, by each region utilizes Site Selection combined analytical method problem summary can be used weakness zone Few compensation point position, can prevent the redundancy of dynamic reactive Site Selection, and can efficiently strengthen the Transient Voltage Stability of system Property.

In order to be analyzed dynamic reactive Site Selection, the present invention proposes voltage after can reflecting electric network fault and recovers The Transient Voltage Stability index of ability: transient voltage recovers index TVRI and transient voltage fluctuation index TVFI, comes electricity with this After net fault, transient voltage departure degree and transient swing degree are estimated.Present invention is alternatively directed to Transient Voltage Stability weak Region gives a kind of based on the Simple Calculation Method compensating sensitivity under TVRI index and TVFI index.

Accompanying drawing explanation

Fig. 1 is the structural representation of site selection system of the present invention；

Fig. 2 is the method flow diagram of siting analysis method of the present invention；

Fig. 3 is transient voltage curve after electrical network large disturbances；

Fig. 4 is the schematic diagram of dynamic reactive compensation device combination addressing method；

Fig. 5 is the schematic diagram of extension alternating current-direct current combined hybrid system based on IEEE39.

Detailed description of the invention

For the technical characterstic of this programme can be clearly described, below by detailed description of the invention, and combine its accompanying drawing, to this Bright it is described in detail.Following disclosure provides many different embodiments or example for realizing the different knots of the present invention Structure.In order to simplify disclosure of the invention, hereinafter parts and setting to specific examples are described.Additionally, the present invention is permissible Repeat reference numerals and/or letter in different examples.This repetition is for purposes of simplicity and clarity, and itself does not indicates Relation between various embodiment being discussed and/or arranging.It should be noted that, parts illustrated in the accompanying drawings are not necessarily to scale Draw.Present invention omits the description to known assemblies and treatment technology and process to avoid being unnecessarily limiting the present invention.

For the weakness zone of transient voltage unstability risk present in electrical network, dynamic reactive planning can be taken precautions against as one Measure.Firstly the need of determining Site Selection position in dynamic reactive planning, dynamic reactive Site Selection be common are two kinds Mode is determined, and one carries out selecting preferred plan compensation point, separately for setting up suitable Transient Voltage Stability index Outer one for setting up dynamic reactive plan optimization model, in model using equal to Site Selection position and dynamic passive compensation capacity as Optimized variable carries out optimizing.Relatively simple by optimizing by the way of optimizing to Site Selection position, but for actual bulk power grid In will increase optimized variable so that control variable dimension substantially increases, therefore, based on Transient Voltage Stability index propose Excellent dynamic reactive Site Selection is analyzed method and can Site Selection problem and constant volume problem be decomposed, the most right Dynamic reactive planning problem is simplified.Therefore, the dynamic reactive Site Selection setting up consideration Enhancement of Transient Voltage Stability is analyzed Method is conducive to the decomposition to dynamic reactive planing method and simplification, and can efficiently strengthen the Enhancement of Transient Voltage Stability of system.

As it is shown in figure 1, a kind of dynamic reactive Site Selection considering Enhancement of Transient Voltage Stability of the present invention analyzes system, It includes:

Data acquisition module, directly obtains the related data of electrical network or by input equipment typing electrical network from network system Related data, the related data of electrical network includes the transient state parameter of DC transmission system, dynamic reactive compensation device and electromotor And control system parameter, therefrom can obtain generator failure, extra-high-voltage alternating current fault, extra-high voltage direct-current transmission fault and line Road fault message；

Simulation analysis module, simulation analysis module is provided with time-domain-simulation and analyzes software, in order to the transient voltage to electrical network Stability carries out simulation analysis, is analyzed determining transient voltage unstability failure collection by electric network fault, is designated asDescribed Failure collectionIncluding generator failure, extra-high-voltage alternating current fault, extra-high voltage direct-current transmission fault and line fault；

Region divides module, in order to basisThe electrical network that just breaks down of distribution be divided into several transient voltages Stablize weakness zone；

Siting analysis module, in order to analyze the fault of Transient Voltage Stability weakness zone one by one, and calculates each Dynamic passive compensation sensitivity under malfunction, one of them electric network fault is weak to utilize Site Selection combined analytical method to determine The number of the point to be compensated in region and position, if 1 compensation point cannot meet steady demand, then need 2 the most multiple Compensation point combination carries out reactive-load compensation to weakness zone；

Output module, treats dot position in order to export the dynamic reactive Site Selection of all Transient Voltage Stability weakness zones Scheme.

Described siting analysis module includes dynamic passive compensation Calculation of Sensitivity module and Site Selection combinative analysis module； Described dynamic passive compensation Calculation of Sensitivity module recovers the compensation sensitivity of index TVRI in order to calculate based on transient voltageWith compensation sensitivity based on transient voltage fluctuation index TVFIDescribed Site Selection combinative analysis module is first Utilize time-domain simulation program that the Enhancement of Transient Voltage Stability of the whole network is emulated and analyzed, and according to there is Enhancement of Transient Voltage Stability The failure collection of problem is divided into several weakness zones；For each Transient Voltage Stability weakness zone, optional one or Multiple points to be selected compensate, and the principle of Site Selection is the Enhancement of Transient Voltage Stability utilizing minimum compensation point to improve system； Carry out one by one based on described compensation sensitivity the failure collection in each region of Transient Voltage Stability weakness zone calculating and Analyze, if 1 dynamic reactive compensation device can not solve the problem of Enhancement of Transient Voltage Stability, then need by 2 even more multiple stage Dynamic reactive compensation device compensates；Based on dynamic passive compensation sensitivity, the addressing position of each weakness zone is counted Calculate and screening, finally show that the dynamic reactive Site Selection of all Transient Voltage Stability weakness zones treats reconnaissance location schemes, with Improve the Enhancement of Transient Voltage Stability of the whole network.

As in figure 2 it is shown, a kind of dynamic reactive Site Selection considering Enhancement of Transient Voltage Stability of the present invention analyzes method, should The system structure schematic diagram that siting analysis method is depended on is as it is shown in figure 1, give dynamic passive compensation equipment locating method Analyze and screening scheme.

Siting analysis method of the present invention can solve the nearest of the idle planning problem of consideration Enhancement of Transient Voltage Stability Compensate position, utilize the transient voltage unstability region of time-domain-simulation software analysis system, and use idle Site Selection combined method Being analyzed the optimal compensation point quantity and position, the addressing idiographic flow of dynamic reactive planning is as shown in Figure 2.

Siting analysis method of the present invention may utilize time-domain-simulation analysis software and assists, and it mainly comprises the following steps:

Step 1: obtaining the related data of electrical network, the related data of electrical network includes DC transmission system, dynamic passive compensation The transient state parameter of device and electromotor and control system parameter thereof；

Step 2: the Enhancement of Transient Voltage Stability of electrical network is carried out simulation analysis, by generator failure, extra-high-voltage alternating current event The electric network faults such as barrier, extra-high voltage direct-current transmission fault and line fault are analyzed determining transient voltage unstability failure collection, note ForAnd according toDistribution the electrical network broken down is divided into several Transient Voltage Stability weakness zones；

Step 3: the fault of Transient Voltage Stability weakness zone is analyzed one by one, and calculate under each malfunction Dynamic passive compensation sensitivity (WithCan calculate based on formula (8) or (10)), utilize Site Selection combinative analysis Method determines number and the position of the point to be compensated of one of them electric network fault weakness zone, if 1 compensation point cannot meet surely Determine demand, then need 2 the most multiple compensation points combinations that weakness zone is carried out reactive-load compensation；

Step 4: the most complete to the dynamic reactive Site Selection analysis of all Transient Voltage Stability weakness zones, if The dynamic reactive Site Selection then exporting all Transient Voltage Stability weakness zones treats reconnaissance location schemes, otherwise forwards step 3 to Continue the Site Selection analysis to next weakness zone, until the dynamic reactive of all Transient Voltage Stability weakness zones is planned Till siting analysis is complete.

Siting analysis method of the present invention each region is utilized Site Selection combined analytical method can by problem summary, To weakness zone with minimum compensation point position, the redundancy of dynamic reactive Site Selection can be prevented.

Electrical network transient voltage after a failure responds schematic diagram as it is shown on figure 3, wherein, U_NFor rated voltage；t_FFor electrical network event Barrier time of origin；t_clFor electric network fault checkout time；t_cFor the deadline calculated for Transient Voltage Stability index.After fault The region that Voltage Instability occurs can be caused, can improve by installing dynamic reactive compensation device.

In order to dynamic passive compensation facility planning addressing is analyzed, after needing first to propose to reflect electric network fault The Transient Voltage Stability index of voltage recovery capability, it is proposed to this end that transient voltage recovers index TVRI (Transient Voltage recovery index, TVRI) and transient voltage fluctuation index TVFI (transient voltage Fluctuation index, TVFI), transient voltage departure degree after electric network fault and transient swing degree are estimated.

Described transient voltage recovers index TVRI, and its definition is:

${\mathrm{TVRI}}_i^{F_k}={\∫}_{t_{cl}}^{t_c}\frac{|U_{t,i}-U_{i0}|}{U_{i0}}dt---\left(1\right)$

In formula: U_t,iFor the transient voltage in t node i；U_i0For the voltage under node i nominal situation；t_cExtensive for transient state Deadline during Fu；F_kFault type for electrical network；Wherein, For failure collection.

Wherein, failure collectionIncluding generator failure, extra-high-voltage alternating current fault, extra-high voltage direct-current transmission fault, circuit Fault etc., it is represented by:

In formula: R_G, R_UHV, R_HVDC, R_BRRepresent generator failure set, extra-high-voltage alternating current failure collection, direct current transportation respectively Failure collection and line fault set.

Transient voltage recovers transient voltage after index can be used for assessing electric network fault and deviates the degree under nominal situation, with weighing apparatus Transient voltage recovery capability after amount fault.For the ease of utilizing time-domain-simulation to analyze program, the transient voltage after fault is recovered Index calculates, and is its difference definition by the TVRI index expression of formula (1):

${\mathrm{TVRI}}_i^{F_k}=\underset{F_k,t\∈\[t_{cl},t_c\]}{\Σ}\frac{|U_{t,i}-U_{i0}|}{U_{i0}}{t}_s---\left(3\right)$

In formula: t_sMaterial calculation in analyzing for time-domain-simulation.

Node i failure collection can be weighedUnder transient voltage recovery extent,Arbitrary node can be entered Row calculates, and in order to be estimated the transient voltage recovery capability under certain region or the whole network, gives overall situation transient voltage extensive Answering index, it is defined as:

${\mathrm{TVRI}}_s^{F_k}=\max \left({\mathrm{TVRI}}_i^{F_k}\right)=\max \left(\underset{F_k,t\∈\[t_{cl},t_c\]}{\Σ}\frac{|U_{t,i}-U_{i0}|}{U_{i0}}{t}_s\right)---\left(4\right)$

Overall situation transient voltage recovers indexBy all nodes in assessment areaMaximum determines.When When TVRI index is bigger, then showing that faulty grids does not possess the ability of recovery automatically, this node causes after grid collapses The hidden danger of spread of voltage is the biggest, and this node is transient stability weak node, needs by taking certain indemnifying measure to give To prevent trouble before it happens.Transient voltage recovery situation after fault is relevant to the control system of grid structure and dynamic regulating element.

Described transient voltage fluctuation index TVFI definition is:

${\mathrm{TVFI}}_i^{F_k}=\frac{1}{2}\left(\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\max }^{F_k,N_p}-\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\min }^{F_k,N_p}\right)---\left(5\right)$

In formula: N_TCycle for transient state time-domain-simulation；N_pFor pth after electric network fault_thSecondary cycle；Point Wei F_kFault lower node i is at N_pThe minimum and maximum voltage of cycle.

It is also possible to definition TVFI general indices under the whole network is:

${\mathrm{TVFI}}_s^{F_k}=max\left({\mathrm{TVFI}}_i^{F_k}\right)=max\left(\frac{1}{2}\right(\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\max }^{F_k,N_p}-\frac{1}{N_T}\underset{p=1}{\overset{N_T}{\Σ}}{U}_{i,\min }^{F_k,N_p}\left)\right)---\left(6\right)$

TVFI index can averagely be fluctuated by the voltage transient after fault and weigh the voltage recovery capability of electrical network.

Described dynamic reactive Site Selection is analyzed method and can be calculated and screen by compensating sensitivity, for transient state Voltage stabilization weakness zone gives based on the Simple Calculation Method compensating sensitivity under TVRI index and TVFI index.

Described compensation sensitivity based on TVRI index is represented by:

$S_{{\mathrm{TVRI}}_s}^{F_k}=\frac{\∂{\mathrm{TVRI}}_s^{F_k}}{\∂Q_{svc}}---\left(7\right)$

In order to utilize transient emulation analysis software and calculate the node to be selected of dynamic reactive compensation device, can be by formula (7) it is converted into:

$S_{{\mathrm{TVRI}}_s}^{F_k}=\frac{{\mathrm{\ΔTVRI}}_s^{F_k}}{{\mathrm{\ΔQ}}_{svc}}---\left(8\right)$

In formula: TVRI_sCan be solved by formula (4).

Described compensation sensitivity based on TVFI index is represented by:

$S_{{\mathrm{TVFI}}_s}^{F_k}=\frac{\∂{\mathrm{TVFI}}_s^{F_k}}{\∂Q_{svc}}---\left(9\right)$

Equally, for the ease of transient emulation analytical calculation, formula (9) can be reduced to:

$S_{{\mathrm{TVFI}}_s}^{F_k}=\frac{{\mathrm{\ΔTVFI}}_s^{F_k}}{{\mathrm{\ΔQ}}_{svc}}---\left(10\right)$

In formula: TVFI_sCan be solved by formula (6).

Consider the dynamic reactive Site Selection nearest compensation point problem of Enhancement of Transient Voltage Stability, weak to Transient Voltage Stability Region can be identified by dynamic reactive planning combination siting analysis method.

Dynamic reactive Site Selection combined analytical method can solve addressing and treat number and the best of breed problem of reconnaissance, it is intended to Prevent from the compensation node in Site Selection is too much invested.Owing to actual area Net Frame of Electric Network is complex, bus is numerous, in order to Make described dynamic reactive Site Selection analyze method can more quickly, convenient and be applied to actual electric network efficiently, first First may utilize time-domain simulation program the Enhancement of Transient Voltage Stability of the whole network is emulated and analyzed, according to there is Transient Voltage Stability The failure collection of sex chromosome mosaicism is divided into several weakness zones, for each Transient Voltage Stability weakness zone, and optional one Or multiple point to be selected compensates, the principle of Site Selection is the Transient Voltage Stability utilizing minimum compensation point to improve system Property.Dynamic reactive Site Selection combined analytical method as shown in Figure 4, the fault to each region of Transient Voltage Stability weakness zone Set calculates one by one based on described compensation sensitivity and analyzes, if 1 dynamic reactive compensation device can not solve transient state The problem of voltage stability, then need to compensate with 2 even more multiple stage dynamic reactive compensation devices.Dynamic reactive planning choosing The addressing position of each weakness zone, based on dynamic passive compensation sensitive analysis and screening, is calculated and sieves by the method for location Choosing, finally improves the Enhancement of Transient Voltage Stability of the whole network.

Below in conjunction with a concrete Application Example, the present invention is verified.

As a example by this embodiment uses extension alternating current-direct current combined hybrid system based on IEEE39 standard example, expansion based on IEEE39 The structure chart of exhibition alternating current-direct current combined hybrid system is as it is shown in figure 5, have 3 direct current transportation and access in system, wherein, and rectification side access point Be respectively node 2,10 and 12, inverter side access point is respectively node 8,17 and 26, and DC transmission system uses determines electric current Determining gamma kick pattern, rectification side initial DC transmission current is 1.0p.u., and the blow-out angle of inverter side is 8.0 °.Pass through IEEE39 standard example proposition is considered Enhancement of Transient Voltage Stability dynamic reactive Site Selection analyze method carry out checking and Analyze.

Analyze program based on time-domain-simulation the Enhancement of Transient Voltage Stability of this extension system is analyzed, wherein, electrical network event Barrier type uses three-phase fault, is set to 100ms fault time, and faulty line end checkout time postpones 50ms and removes.Pass through Learn after transient emulation analysis, the extension system of this IEEE39 has two Transient Voltage Stability weakness zones, respectively such as Fig. 5 In weakness zone 1 and weakness zone 2, the line fault that there is Voltage Instability risk has 8, Voltage Instability region and line Road is as shown in table 1.

Table 1: there is region and the circuit of transient voltage unstability risk

As a example by the 10-13 line fault of Transient Voltage Stability weakness zone 1, it compensates the result of calculation such as table of sensitivity Shown in 2, by compensation sensitivity results based on TVRI index and TVFI index, this region only has node 10 or 11 to install After can making fault after dynamic reactive compensation device, transient voltage is recovered, and the idle Site Selection of optimal dynamic in region 1 Position is node 11, and by the planning combined analytical method of dynamic reactive compensation device, this region only needs 1 dynamic reactive to mend Repay device.

Table 2: after circuit 10-13 fault, addressing compensates sensitivity

It is as shown in table 3 to the circuit 26-27 fault post-compensation sensitive analysis result of Transient Voltage Stability weakness zone 2, By calculating, this region only can not reach to improve the mesh of Enhancement of Transient Voltage Stability by 1 dynamic reactive compensation device of installation , utilizing Site Selection combined analytical method that 2 dynamic reactive compensation devices are installed and be analyzed, result shows, 2 table apparatus can be real The ability that existing post-fault system recovers, and have 3 kinds and treat that reconnaissance compound mode can improve Enhancement of Transient Voltage Stability, according to compensation Sensitive analysis result understands, and node 28 and node 29 are respectively mounted dynamic reactive compensation device and change at Enhancement of Transient Voltage Stability Kind effect sensitivity is the highest.

Table 3: after circuit 26-27 fault, dynamic passive compensation addressing compensates sensitivity

Therefore, this embodiment consider Enhancement of Transient Voltage Stability optimal dynamic idle addressing position be node 11,28 and 29, by verifying one by one the institute in weakness zone is faulty, these 3 nodes are as dynamic reactive Site Selection Treat that reconnaissance has good improvement effect.

Additionally, the range of application of the present invention is not limited to the technique of specific embodiment described in description, mechanism, system Make, material composition, means, method and step.From the disclosure, will be easily as those of ordinary skill in the art Ground understands, for the technique having existed at present or will having developed later, mechanism, manufacture, material composition, means, method or Step, wherein they perform the knot that the function that is substantially the same of corresponding embodiment or acquisition with present invention description are substantially the same Really, they can be applied according to the present invention.Therefore, claims of the present invention are intended to these technique, mechanism, system Make, material composition, means, method or step are included in its protection domain.

Claims (10)

1. consider that the dynamic reactive Site Selection of Enhancement of Transient Voltage Stability analyzes method, it is characterized in that, comprise the following steps:

Step 1: obtaining the related data of electrical network, the related data of electrical network includes DC transmission system, dynamic reactive compensation device Transient state parameter and control system parameter thereof with electromotor；

Step 2: the Enhancement of Transient Voltage Stability of electrical network is carried out simulation analysis, is analyzed determining transient voltage by electric network fault Unstability failure collection, is designated asAnd according toDistribution the electrical network broken down is divided into several Transient Voltage Stabilities Weakness zone；

Step 3: the fault of Transient Voltage Stability weakness zone is analyzed one by one, and calculate under each malfunction dynamic Reactive-load compensation sensitivity, utilizes Site Selection combined analytical method to determine the point to be compensated of one of them electric network fault weakness zone Number and position, if 1 compensation point cannot meet steady demand, then need 2 compensation points the most multiple to combine weakness Region carries out reactive-load compensation；

Step 4: the most complete to the dynamic reactive Site Selection analysis of all Transient Voltage Stability weakness zones, the most defeated The dynamic reactive Site Selection going out all Transient Voltage Stability weakness zones treats reconnaissance location schemes, otherwise forwards step 3 to and continues Site Selection analysis to next weakness zone, until the dynamic reactive Site Selection to all Transient Voltage Stability weakness zones Analyze complete till.

The dynamic reactive Site Selection of consideration Enhancement of Transient Voltage Stability the most according to claim 1 analyzes method, its feature It is that described failure collection includes generator failure, extra-high-voltage alternating current fault, extra-high voltage direct-current transmission fault and line fault.

The dynamic reactive Site Selection of consideration Enhancement of Transient Voltage Stability the most according to claim 1 analyzes method, its feature It is that described dynamic passive compensation sensitivity includes the compensation sensitivity recovering index TVRI based on transient voltageWith based on temporarily The compensation sensitivity of state voltage pulsation index TVFI

Described compensation sensitivityCalculating process comprise the following steps:

(11) transient voltage recovery index TVRI is defined as:

In formula: U_t,iFor the transient voltage in t node i；U_i0For the voltage under node i nominal situation；t_cFor transient recovery mistake Deadline in journey；F_kFault type for electrical network；Wherein, For failure collection；

(12) failure collectionIt is expressed as:

In formula: R_G, R_UHV, R_HVDC, R_BRRepresent generator failure set, extra-high-voltage alternating current failure collection, direct current transportation fault respectively Set and line fault set；

(13) it is its difference definition by the TVRI index expression of formula (1):

In formula: t_sMaterial calculation in analyzing for time-domain-simulation；

(14) useArbitrary node in electrical network is calculated, can show that overall situation transient voltage recovers index and is:

From formula (4), overall situation transient voltage recovers indexBy all nodes in assessment areaMaximum Determine；

Compensation sensitivity table based on TVRI index is shown as:

Formula (7) is converted into:

In formula: TVRI_sCan be solved by formula (4), Q_SVCFor reactive compensation capacity；

Described compensation sensitivityCalculating process comprise the following steps:

(21) transient voltage fluctuation index TVFI is defined as:

In formula: N_TCycle for transient state time-domain-simulation；N_pFor pth after electric network fault_thSecondary cycle；It is respectively F_k Fault lower node i is at N_pThe minimum and maximum voltage of cycle；

(22) useArbitrary node in electrical network is calculated, can show that transient voltage fluctuation index is:

(23) compensation sensitivity table based on TVFI index is shown as:

Formula (9) is reduced to:

In formula: TVFI_sCan be solved by formula (6), Q_SVCFor reactive compensation capacity.

The dynamic reactive Site Selection of consideration Enhancement of Transient Voltage Stability the most according to claim 1 analyzes method, its feature It is that described Site Selection combined analytical method comprises the following steps:

(1) utilize time-domain simulation program that the Enhancement of Transient Voltage Stability of the whole network is emulated and analyzed, and according to there is transient state electricity The failure collection of pressure stability problem is divided into several weakness zones；

(2) for each Transient Voltage Stability weakness zone, optional one or more points to be selected compensate, Site Selection Principle be the Enhancement of Transient Voltage Stability utilizing minimum compensation point to improve system；

(3) failure collection in each region of Transient Voltage Stability weakness zone is carried out one by one based on described compensation sensitivity Calculate and analyze, if 1 dynamic reactive compensation device can not solve the problem of Enhancement of Transient Voltage Stability, then need with 2 even More multiple stage dynamic reactive compensation device compensates；

(4) based on dynamic passive compensation sensitivity, the addressing position of each weakness zone is calculated and screens, finally draw The dynamic reactive Site Selection of all Transient Voltage Stability weakness zones treats reconnaissance location schemes, to improve the transient voltage of the whole network Stability.

The dynamic reactive Site Selection of consideration Enhancement of Transient Voltage Stability the most according to claim 1 analyzes method, its feature It is that the related data of described electrical network directly obtains or by input equipment typing from network system.

6. consider that the dynamic reactive Site Selection of Enhancement of Transient Voltage Stability analyzes system, it is characterized in that, including:

Data acquisition module, in order to obtain the related data of electrical network, the related data of electrical network includes DC transmission system, dynamic nothing The transient state parameter of Reactive power compensation installations and electromotor and control system parameter thereof；

Simulation analysis module, in order to the Enhancement of Transient Voltage Stability of electrical network is carried out simulation analysis, is analyzed by electric network fault Determine transient voltage unstability failure collection, be designated as

Region divides module, in order to basisThe electrical network that just breaks down of distribution to be divided into several Transient Voltage Stabilities thin Weak-strong test；

Siting analysis module, in order to analyze the fault of Transient Voltage Stability weakness zone one by one, and calculates each fault Dynamic passive compensation sensitivity under state, utilizes Site Selection combined analytical method to determine one of them electric network fault weakness zone The number of point to be compensated and position, if 1 compensation point cannot meet steady demand, then need 2 compensation the most multiple Point combination carries out reactive-load compensation to weakness zone；

Output module, treats dot position side in order to export the dynamic reactive Site Selection of all Transient Voltage Stability weakness zones Case.

The dynamic reactive Site Selection system of consideration Enhancement of Transient Voltage Stability the most according to claim 6, is characterized in that, institute State failure collection and include generator failure, extra-high-voltage alternating current fault, extra-high voltage direct-current transmission fault and line fault.

The dynamic reactive Site Selection system of consideration Enhancement of Transient Voltage Stability the most according to claim 6, is characterized in that, institute State siting analysis module and include dynamic passive compensation Calculation of Sensitivity module and Site Selection combinative analysis module；

Described dynamic passive compensation Calculation of Sensitivity module is sensitive in order to calculate compensation based on transient voltage recovery index TVRI DegreeWith compensation sensitivity based on transient voltage fluctuation index TVFI

Described compensation sensitivityCalculating process comprise the following steps:

(11) transient voltage recovery index TVRI is defined as:

In formula: U_t,iFor the transient voltage in t node i；U_i0For the voltage under node i nominal situation；t_cFor transient recovery mistake Deadline in journey；F_kFault type for electrical network；Wherein, For failure collection；

(12) failure collectionIt is expressed as:

In formula: R_G, R_UHV, R_HVDC, R_BRRepresent generator failure set, extra-high-voltage alternating current failure collection, direct current transportation fault respectively Set and line fault set；

(13) it is its difference definition by the TVRI index expression of formula (1):

In formula: t_sMaterial calculation in analyzing for time-domain-simulation；

(14) useArbitrary node in electrical network is calculated, can show that overall situation transient voltage recovers index and is:

From formula (4), overall situation transient voltage recovers indexBy all nodes in assessment areaMaximum Determine；

Compensation sensitivity table based on TVRI index is shown as:

Formula (7) is converted into:

In formula: TVRI_sCan be solved by formula (4), Q_SVCFor reactive compensation capacity；

Described compensation sensitivityCalculating process comprise the following steps:

(21) transient voltage fluctuation index TVFI is defined as:

In formula: N_TCycle for transient state time-domain-simulation；N_pFor pth after electric network fault_thSecondary cycle；It is respectively F_k Fault lower node i is at N_pThe minimum and maximum voltage of cycle；

(22) useArbitrary node in electrical network is calculated, can show that transient voltage fluctuation index is:

(23) compensation sensitivity table based on TVFI index is shown as:

Formula (9) is reduced to:

In formula: TVFI_sCan be solved by formula (6), Q_SVCFor reactive compensation capacity.

The dynamic reactive Site Selection system of consideration Enhancement of Transient Voltage Stability the most according to claim 8, is characterized in that, institute State Site Selection combinative analysis module first with time-domain simulation program the Enhancement of Transient Voltage Stability of the whole network emulated and divide Analysis, and it is divided into several weakness zones according to the failure collection that there is Enhancement of Transient Voltage Stability problem；For each transient state electricity Pressure stablizes weakness zone, and optional one or more points to be selected compensate, and the principle of Site Selection is to utilize minimum compensation The Enhancement of Transient Voltage Stability of some raising system；To the failure collection in each region of Transient Voltage Stability weakness zone based on described Compensation sensitivity calculate one by one and analyze, if 1 dynamic reactive compensation device can not solve Enhancement of Transient Voltage Stability Problem, then need to compensate with 2 even more multiple stage dynamic reactive compensation devices；Based on dynamic passive compensation sensitivity to often The addressing position of individual weakness zone calculates and screens, and finally draws the dynamic reactive of all Transient Voltage Stability weakness zones Site Selection treats reconnaissance location schemes, to improve the Enhancement of Transient Voltage Stability of the whole network.

The dynamic reactive Site Selection system of consideration Enhancement of Transient Voltage Stability the most according to claim 6, is characterized in that, Described data acquisition module directly obtains the related data of electrical network or by the phase of input equipment typing electrical network from network system Close data.