New energy sending area broadband oscillation coordination control method, device and system

Abstract

The application belongs to the field of power system automation, and discloses a new energy sending area wide frequency oscillation coordination control method, device and system. The method comprises the following steps: deploying a control master station at a hub substation in a new energy sending area, and deploying a control substation at a new energy collection station; selecting an emergency control measure set according to the oscillation mode power of the outgoing line of each control substation; selecting a new energy grid-connected line with the largest oscillation power amplitude value ratio in the selected set; performing control in turns, and adjusting the control range according to the control effect. The application can realize accurate positioning and rapid coordination control of the oscillation source in the new energy sending area, avoid disordered action of protection devices of each station to cut off units after oscillation occurs, and ensure the safe and stable operation of the power grid.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power systems and their automation, and particularly relates to a new energy sending area wide frequency oscillation coordinated control method, device and system. BACKGROUND

[0002] With the increasing proportion of installed capacity of new energy such as wind power and photovoltaic power, and the rapid development of flexible DC transmission and power electronic loads, the power system gradually presents high proportion of power electronic characteristics.

[0003] In the new power system, wide frequency oscillation problems are easily caused between new energy units and flexible DC and new energy units. The traditional oscillation suppression means is difficult to adapt to the complex and variable oscillation scenarios brought by large-scale new energy access. In recent years, oscillation caused by new energy has occurred from time to time, which seriously threatens the safe and stable operation of the power grid.

[0004] The current engineering control of wide frequency oscillation mostly adopts local control mode, and lacks unified coordinated control for large-scale new energy sending area, which easily causes disordered action of devices between plants and stations and over-tripping of units. At the same time, the existing control strategy lacks theoretical support and the control means is extensive, resulting in large control cost of oscillation.

[0005] Prior art document 1 (CN 115528701 A) discloses a coordinated control method and system for improving the stability of power grid wide frequency oscillation. Notably, in the technical solution of prior art document 1: 1) the control master station and the control sub-station realize wide frequency information and control instruction interaction through the dispatching data network, and the real-time and reliability of the control are difficult to guarantee, which is not suitable for emergency control of wide frequency oscillation; 2) the coordinated control strategy mechanism is not clear, and there is a risk of over-tripping new energy; 3) the implementation is complex, and the engineering implementation is difficult.

[0006] Prior art document 2 (CN 115693706 A) discloses a power grid wide frequency oscillation control method and device fusing multiple feature information. Notably, in the technical solution of prior art document 2: 1) the control method lacks coordination, and regional oscillation may cause disordered tripping of devices in multiple plants and stations, which may worsen the oscillation and even bring other security and stability problems; 2) the control strategy mechanism is not clear, and there is a risk of over-tripping new energy; 3) the sequence resistance of the oscillation mode is difficult to accurately measure, and the method implementation is difficult. SUMMARY

[0007] The purpose of the present application is to overcome the shortcomings of the prior art and provide a new energy sending area wide frequency oscillation coordinated control method, device and system.

[0008] To achieve the above object, the present application adopts the following technical solutions to achieve the present application: the first aspect of the present application provides a new energy sending area wide frequency oscillation coordination control method, comprising:

[0009] Step 1: monitor the oscillation characteristic quantity of the regional power grid tie line, judge whether the regional power grid tie line exists oscillation, if not, continue to monitor the regional power grid tie line; if there is oscillation, collect the voltage and current signals of the out-of-line of the collection station and the new energy grid-connected line, obtain the fundamental characteristic quantity and the oscillation characteristic quantity of the line;

[0010] Step 2: calculate the oscillation mode power of the out-of-line of the collection station and the oscillation power amplitude ratio of the new energy grid-connected line;

[0011] Step 3: according to the direction and size of the oscillation mode power of the out-of-line of the collection station, the emergency control measure set S1, S2 is selected;

[0012] Step 4: eliminate the new energy grid-connected line in the emergency control measure set S1, S2 which is shut down or does not exist oscillation;

[0013] Step 5: according to the order of the oscillation power amplitude ratio from large to small, the new energy grid-connected line in the emergency control measure set S1, S2 is sorted respectively, and the new energy grid-connected line of the emergency control measure set S1 is sorted before the emergency control measure set S2 as a whole;

[0014] Step 6: cut off the new energy grid-connected line in the first place, and determine the control range of the next round according to the control effect of this round;

[0015] Step 7: repeat the above steps until the oscillation is controlled.

[0016] Preferably, in step 2, the calculation of the oscillation mode power of the out-of-line of the collection station comprises:

[0017] When the oscillation voltage amplitude is lower than the set proportion of the rated voltage or the oscillation current amplitude is lower than the set proportion of the rated current, the formula (2) is used to calculate the oscillation mode power of the out-of-line of the collection station; otherwise, the formula (1) is used to calculate the oscillation mode power of the out-of-line of the collection station:

[0018]

[0019] Wherein:

[0020] P m_WF0 (t) is the oscillation mode power of the out-of-line of the collection station m,

[0021] U m_WF (t) is the oscillation voltage amplitude of the out-of-line of the collection station m,

[0022] I m_WF (t) is the oscillation current amplitude of the out-of-line of the collection station m,

[0023] θ m_WF θm(t) is the phase angle difference of the oscillation voltage and oscillation current of the out line of the collection station m,

[0024] P m_DC Pm(t) is the direct current component of the power of the out line of the collection station m,

[0025] P m_0 Pm(t) is the fundamental power of the out line of the collection station m.

[0026] Preferably, in the step 2, the oscillation power amplitude ratio of the new energy grid-connected line is calculated according to the following formula (3):

[0027]

[0028] wherein,

[0029] P mn_WF_REL Pmn(t) is the oscillation power amplitude ratio of the new energy grid-connected line n of the collection station m,

[0030] P mn_WF Pmn(t) is the oscillation power amplitude of the new energy grid-connected line n of the collection station m,

[0031] P mn_0 Pmn(t) is the fundamental power of the new energy grid-connected line n of the collection station m.

[0032] Preferably, the step 3 comprises: setting an oscillation mode power threshold, if the oscillation mode power of the out line of the collection station is positive and greater than the oscillation mode power threshold, the new energy grid-connected line of the collection station is included in the emergency control measure set S1; if the oscillation mode power of the out line of the collection station is negative and the absolute value is greater than the oscillation mode power threshold, the new energy grid-connected line of the collection station is included in the emergency control measure set S2; otherwise, the new energy grid-connected line of the collection station is not included in the emergency control measure set.

[0033] Preferably, the step 4 comprises: setting a judgment oscillation existence threshold, if the oscillation amplitude ratio of the new energy grid-connected line exceeds the judgment oscillation existence threshold, it is judged that the new energy grid-connected line exists oscillation; otherwise, it is judged that the new energy grid-connected line does not exist oscillation.

[0034] Preferably, the step 6 comprises: judging whether the oscillation of the regional grid tie line after the new energy grid-connected line is cut off is suppressed, and dynamically adjusting the control range according to the oscillation suppression situation, specifically comprising: if the oscillation is suppressed, the new energy collection station selected in the current round is still allowed to be included in the subsequent round of emergency control measure set; otherwise, the new energy collection station selected in the current round is no longer included in the subsequent round of emergency control measure set.

[0035] Preferably, the step 6 judges whether the oscillation is suppressed, comprising:

[0036] If the oscillation amplitude of the regional power grid tie line monitored by the new energy hub substation decreases after the new energy grid-connected line is cut off, it is judged that the oscillation is suppressed, otherwise it is judged that the oscillation is not suppressed.

[0037] The second aspect of the application provides a new energy sending area wide frequency oscillation coordination control device, comprising:

[0038] A data acquisition and analysis module is configured to acquire voltage and current signals of the out-of-station line and the new energy grid-connected line, and obtain fundamental characteristic quantities and oscillation characteristic quantities of the line.

[0039] A calculation module is configured to calculate a ratio of oscillation modal power of the out-of-station line to oscillation power amplitude of the new energy grid-connected line.

[0040] A screening module is configured to screen an emergency control measure set S1 and S2 according to the size of the oscillation modal power of the out-of-station line.

[0041] An ordering module is configured to order the new energy grid-connected lines in the sets S1 and S2 according to the ratio of the oscillation power amplitude from large to small.

[0042] A judgment module is configured to judge whether the new energy exists oscillation, whether the oscillation is suppressed after control, and whether the new energy collection station selected in this round participates in the subsequent round of control.

[0043] A communication module is configured to realize millisecond-level communication between devices of different plants and stations.

[0044] The third aspect of the application provides a new energy sending area wide frequency oscillation coordination control system, which runs the new energy sending area wide frequency oscillation coordination control method, comprising:

[0045] A control master station is deployed at a new energy sending area hub substation.

[0046] A control substation is deployed at a new energy collection station.

[0047] A communication medium is configured to provide a physical link for communication between the control master station and the control substation, and realize millisecond-level communication between devices of different plants and stations.

[0048] The fourth aspect of the application provides a computer readable storage medium, which stores a computer program, characterized in that the computer program is executed by a processor to run the new energy sending area wide frequency oscillation coordination control method.

[0049] Compared with the prior art, the application has the following beneficial effects:

[0050] The application provides a new energy sending area broadband oscillation coordination control method, device and system, which calculates the oscillation mode power of the gathering station outgoing line and the oscillation power amplitude ratio of the new energy grid-connected line, selects the emergency control measure set S1 and S2 according to the oscillation mode power direction and size of the gathering station outgoing line, and preferentially removes the new energy grid-connected line in the set S1 according to the order from large to small of the oscillation power amplitude ratio, so that accurate positioning and fast coordination control of the oscillation source of the new energy sending area can be realized.

[0051] The application solves the problem of unordered action of multiple power stations caused by the in-situ control of the new energy sending area broadband oscillation, realizes accurate and fast positioning of the oscillation area through the oscillation mode power, and provides a theoretical basis for oscillation control.

[0052] More specifically, compared with the foregoing prior art documents, the beneficial technical effects realized by the application at least include:

[0053] 1) The control master station is arranged at the hub substation in the new energy sending area, communicates with the control substation through the millisecond-level communication private network, the real-time performance and reliability of data and control command interaction are high, the risk of mistakenly cutting off the new energy is reduced, and the application is suitable for the emergency control of broadband oscillation; 2) The problem that the oscillation mode power is difficult to directly and accurately measure is considered, and the direct method and the indirect method are used to calculate the oscillation mode power respectively; 3) The coordination control strategy mechanism is clear, the oscillation source is positioned based on the oscillation energy flow direction, multiple power stations are avoided from simultaneously acting to cut off the unit, the amount of cutting off the new energy can be reduced, and then the oscillation control cost is reduced; 4) The control range is dynamically adjusted according to the control effect of each round, the optimal control combination can be screened out, and the oscillation is avoided from continuously diverging due to the failure of the control measure; 5) The implementation is simple and clear, and is easy to implement in engineering. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 The application provides a new energy sending area broadband oscillation coordination control method flow chart.

[0055] Figure 2 The application provides a network topology structure diagram of a certain area.

[0056] Figure 3 The application provides an emergency control measure set screening diagram.

[0057] Figure 4 The application provides a new energy sending area broadband oscillation coordination control device structure diagram.

[0058] Figure 5The structure schematic diagram of the new energy sending area broadband oscillation coordination control system provided in Embodiment 3 of the present application. DETAILED DESCRIPTION

[0059] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0060] The present application will be further described below in conjunction with the drawings.

[0061] Embodiment 1

[0062] There are at least one new energy collection station in the controlled regional power grid, each new energy collection station is connected to multiple new energy stations through the new energy grid-connected line of the collection station, each new energy collection station is connected to the first substation through the outgoing line, the first substation is connected to the second substation through the regional power grid tie line, and the new energy power generation of the sending area power grid.

[0063] Referring to Figure 1 , the present application provides a new energy sending area broadband oscillation coordination control method in Embodiment 1, which comprises the following steps:

[0064] Step 1: monitoring the oscillation characteristic quantity of the regional power grid tie line, judging whether there is oscillation in the regional power grid tie line, if there is no oscillation, continuously monitoring the regional power grid tie line, if there is oscillation, collecting the voltage and current signals of the collection station outgoing line and the new energy grid-connected line, obtaining the fundamental characteristic quantity and the oscillation characteristic quantity of the line through fast Fourier analysis, and continuing to execute Step 2.

[0065] In the preferred but non-limiting embodiments of the present application, Step 1 specifically comprises:

[0066] Step 11: collecting the three-phase voltage and three-phase current signals of the collection station outgoing line and the new energy grid-connected line;

[0067] Step 12: performing fast Fourier analysis to obtain the fundamental characteristic quantity of the collection station outgoing line, including the fundamental wave power, fundamental wave voltage, fundamental wave current, fundamental wave frequency and other information of the line;

[0068] Step 13: performing fast Fourier analysis to obtain the oscillation characteristic quantity of the collection station outgoing line, including the power direct current component, oscillation power, oscillation voltage, oscillation current, oscillation frequency and other information.

[0069] Step 2: Calculate the ratio of the oscillation modal power of the out-of-station line and the oscillation power amplitude of the new energy grid-connected line.

[0070] In the preferred but non-limiting embodiments of the present application, step 2 specifically includes:

[0071] Step 21: The oscillation modal power of the out-of-station line is calculated by formula (1) or formula (2); when the oscillation voltage amplitude is lower than 1% of the rated voltage or the oscillation current amplitude is lower than 1% of the rated current, i.e. the oscillation voltage phase angle or the oscillation current phase angle measurement error is larger, at this time formula (2) is used to calculate the oscillation modal power, which can reduce the calculation error; otherwise formula (1) is used to calculate the oscillation modal power:

[0072]

[0073] P m_WF0 (t)=P m_DC (t)-P m_0 (t) (2)

[0074] Wherein:

[0075] P m_WF0 (t) is the oscillation modal power of the out-of-station line of the collection station m,

[0076] U m_WF (t) is the oscillation voltage amplitude of the out-of-station line of the collection station m,

[0077] I m_WF (t) is the oscillation current amplitude of the out-of-station line of the collection station m,

[0078] θ m_WF is the phase angle difference of the oscillation voltage and the oscillation current of the out-of-station line of the collection station m,

[0079] P m_DC (t) is the DC component of the power of the out-of-station line of the collection station m,

[0080] P m_0 (t) is the fundamental power of the out-of-station line of the collection station m.

[0081] Step 22: The ratio of the oscillation power amplitude of the new energy grid-connected line is calculated by formula (3):

[0082]

[0083] Wherein,

[0084] P mn_WF_REL (t) is the ratio of the oscillation power amplitude of the new energy grid-connected line n of the collection station m,

[0085] P mn_WF (t) is the oscillation power amplitude of the new energy grid-connected line n of the collection station m,

[0086] P mn_0 (t) is the fundamental power of the new energy grid-connected line n of the collection station m.

[0087] Step 3: Screening the emergency control measure set S1, S2 according to the direction and size of the oscillation modal power of the collection station outgoing line.

[0088] In the preferred but non-limiting embodiments of the present application, the step 3 of screening the emergency control measure set S1, S2 specifically comprises:

[0089] Step 31: Setting the oscillation modal power threshold, which is a device parameter, i.e. the fixed value of the control master station or control substation;

[0090] Step 32: If the oscillation modal power of the collection station outgoing line is positive and greater than the oscillation modal power threshold, the new energy grid-connected line of the collection station is included in the emergency control measure set S1; if the oscillation modal power of the collection station outgoing line is negative and the absolute value is greater than the oscillation modal power threshold, the new energy grid-connected line of the collection station is included in the emergency control measure set S2; otherwise, the new energy grid-connected line of the collection station is not included in the emergency control measure set.

[0091] Step 4: Eliminating the new energy grid-connected line that is shut down or does not exist in the emergency control measure set S1, S2.

[0092] In the preferred but non-limiting embodiments of the present application, the step 4 of judging whether the new energy grid-connected line exists oscillation specifically comprises:

[0093] Step 41: Setting the judgment oscillation existence threshold, which is a device parameter, i.e. the fixed value of the control master station or control substation;

[0094] Step 42: If the oscillation amplitude ratio of the new energy grid-connected line exceeds the judgment oscillation existence threshold, it is judged that the new energy grid-connected line exists oscillation; otherwise, it is judged that the new energy grid-connected line does not exist oscillation.

[0095] Step 5: According to the order of the oscillation power amplitude ratio from large to small, the new energy grid-connected lines in the sets S1, S2 are sorted respectively, and the new energy grid-connected lines in the set S1 are arranged before the new energy grid-connected lines in the set S2 as a whole.

[0096] In the preferred but non-limiting embodiments of the present application, step 5 specifically comprises:

[0097] Step 51: According to the order of the oscillation power amplitude ratio from large to small, the new energy grid-connected lines in the sets S1, S2 are sorted respectively;

[0098] Step 52: The new energy grid-connected lines in the set S1 are arranged before the new energy grid-connected lines in the set S2 as a whole.

[0099] It is worth noting that as one of the prominent essential features of the present application and one of the significant progress brought to the prior art, the present application adopts the mode of judging the power direction of the out-line oscillation mode of the collection station combined with the amplitude ratio. If it is the sending direction, it means that the new energy transmits oscillation energy to the power grid, which can be considered as an oscillation source, and the priority is considered for removal. If it is the receiving direction, it means that the new energy absorbs oscillation energy from the power grid, and the effect will also be achieved after removal.

[0100] Step 6: removing the new energy grid-connected line with the highest priority, and determining the control range of the subsequent round according to the control effect of the present round.

[0101] In the preferred but non-limiting embodiment of the present application, step 6: determining the control range of the subsequent round according to the control effect of the present round, specifically includes:

[0102] Step 61: judging whether the regional power grid tie-line oscillation is suppressed after the removal of the new energy grid-connected line, and dynamically adjusting the control range according to the oscillation suppression situation;

[0103] Step 62: if the oscillation is suppressed, the new energy collection station selected in the present round is still allowed to be included in the emergency control measure set of the subsequent round; otherwise, the new energy collection station selected in the present round is no longer included in the emergency control measure set of the subsequent round.

[0104] The step 6 of judging whether the oscillation is suppressed specifically includes:

[0105] If the regional power grid tie-line oscillation amplitude monitored by the new energy hub substation is reduced after the removal of the new energy, it is judged that the oscillation is suppressed, otherwise it is judged that the oscillation is not suppressed.

[0106] It is worth noting that as one of the prominent essential features of the present application and one of the significant progress brought to the prior art, the present application dynamically adjusts the control range according to the control effect of each round, can screen out the optimal control combination, realizes rapid control of oscillation with smaller control cost, and avoids the failure of control measures leading to continuous divergence of oscillation.

[0107] Step 7: repeating the above steps until the oscillation is controlled.

[0108] The application process of the new energy sending area wide frequency oscillation coordination control method provided in the embodiment specifically involves the following steps:

[0109] In conclusion, the new energy sending area wide frequency oscillation coordination control method of the application can realize accurate positioning and fast coordination control of the oscillation source in the new energy sending area, avoid disordered action of protection devices of each station after oscillation, and ensure safe and stable operation of the power grid.

[0110] In order to more clearly introduce the outstanding substantial features of the application and the significant progress brought to the prior art, the contents involved in the above embodiments will be described below in combination with a preferred embodiment.

[0111] Figure 2 The network topology structure of a certain region is shown in the figure. Taking a new energy sending area power grid in China as an example, the strategy of the application is introduced and described. 500kV new energy collection stations A, B, C and D are connected to three new energy stations respectively, marked as A1, A2, A3, B1, B2, B3, C1, C2, C3, D1, D2, D3; the 500kV new energy collection stations are sent out through 1000kV substations E and F. The out-line of the new energy collection station is marked as L A , L B , L C , L D , the new energy grid-connected line of the collection station is marked as L A1 , L A2 , L A3 , L B1 , L B2 , L B3 , L C1 , L C2 , L C3 , L D1 , L D2 , L D3 , and the regional power grid tie line is marked as L E .

[0112] The three-phase voltage and three-phase current of the regional power grid tie line L E are collected, and the amplitudes and phases of the line oscillation voltage U WF , oscillation current I WF and oscillation power P WF are obtained by fast Fourier analysis. Whether there is oscillation is determined according to the oscillation characteristic quantity of the tie line. If it is determined that there is oscillation in the tie line, the subsequent process is executed, otherwise the subsequent process is not executed.

[0113] The three-phase voltage and three-phase current of the outgoing lines from the new energy collection station are collected, and fast Fourier analysis is performed to obtain the line oscillation voltage U. WF Oscillation current I WF Oscillation power P WF The amplitude and phase angle, as well as the fundamental power P0 and the DC power component P DC size.

[0114] The oscillation mode power P of each new energy collection station's output line was calculated using the formula. WF0 When the amplitude of the outgoing line oscillation voltage of the new energy collection station is less than 1% of the rated voltage or the amplitude of the oscillation current is less than 1% of the rated current, formula P is used. m_WF0 (t)=P m_DC (t)-P m_0 (t) Calculate the oscillation mode power; otherwise, use the formula. Calculate the power of the oscillation mode.

[0115] Table 1. Power of outgoing oscillation modes at each new energy collection station

[0116] Line LA LB LC LD Modeled power of oscillation (MW) -3.2 -1.0 2.8 3.1

[0117] The three-phase voltage and three-phase current of the renewable energy grid-connected line at the data collection and acquisition station are used to perform fast Fourier analysis to obtain the line fundamental power P0 and oscillation power P. WF size.

[0118] According to the formula The oscillation power amplitude ratio P of the new energy grid-connected lines at each collection station was calculated. WF_REL .

[0119] Table 2. Ratio of Oscillation Power Amplitude of New Energy Grid-Connected Lines at Each Aggregator Station

[0120] Line LA1 LA2 LA3 LB1 LB2 LB3 Oscillation power amplitude ratio (%) 3.2 0 1.8 1.5 0 2.0 Line LC1 LC2 LC3 LD1 LD2 LD3 Oscillation power amplitude ratio (%) 1.0 1.7 0.6 1.2 2.8 2.3

[0121] The oscillation mode power P of each new energy collection station output line m_WF0 Sequentially compare with the device parameter "oscillation mode power threshold P" mk_WF0 "Compare. If P m_WF0 ≥P mk_WF0 Then the new energy grid connection line of the aggregation station is included in the emergency control measures set S1; if -P m_WF0 ≥P mk_WF0 If so, the new energy grid connection line of the collection station is included in the emergency control measures set S2.

[0122] Device parameter "Oscillation mode power threshold P" mk_WF0 "If set to 2.5MW, then the emergency control measures set S1 includes the new energy grid connection lines L of the aggregation stations C and D." C1 L C2 L C3L D1 L D2 L D3 The emergency control measure set S2 includes the new energy grid-connected line L A1 L A2 L A3 Referring to Figure 3 .

[0123] The device parameter "oscillation existence threshold" is set to 1.5%, and the line L C1 L C3 L D1 It is determined that there are 3 new energy grid-connected lines L C2 L D2 L D3 The line L A2 It is determined that there are 2 new energy grid-connected lines L A1 L A3 The selected new energy grid-connected lines participating in the emergency control include L C2 L D2 L D3 L A1 L A3 The remaining new energy grid-connected lines do not participate in the emergency control.

[0124] The new energy grid-connected lines in the set S1 are sorted according to the oscillation power amplitude ratio from large to small as the preferred cut-off objects, and the new energy grid-connected lines in the set S2 are sorted according to the oscillation power amplitude ratio from large to small as the backup cut-off objects. The sorting results are shown in the following table.

[0125] Table 3: Sorting table of each new energy grid-connected line

[0126]

[0127] The new energy grid-connected line L D2 is cut off in the order of the above table, and the oscillation amplitude of the tie line is judged after the new energy grid-connected line is cut off. If the oscillation is effectively controlled, the control process is ended. If the oscillation is not effectively controlled, it is further judged whether the oscillation amplitude of the tie line after control is less than the oscillation amplitude before control. If it is less, the new energy grid-connected line of the collection station D is still allowed to be included in the emergency control measure set of the subsequent round, otherwise the new energy grid-connected line of the collection station D is no longer included in the emergency control measure set of the subsequent round.

[0128] The above process is repeated until the regional power grid tie line L E oscillation is effectively controlled.

[0129] Example 2

[0130] Referring to Figure 4 The embodiment 2 of the present application provides a new energy sending area broadband oscillation coordination control device, comprising the following modules:

[0131] A data acquisition and analysis module is configured to acquire voltage and current signals of an out-line of a collection station and a new energy grid-connected line, and obtain fundamental characteristic quantities and oscillation characteristic quantities of the lines;

[0132] A calculation module is configured to calculate an oscillation mode power of the out-line of the collection station and an oscillation power amplitude ratio of the new energy grid-connected line;

[0133] A screening module is configured to screen an emergency control measure set S1 and S2 according to the oscillation mode power of the out-line of the collection station;

[0134] A sorting module is configured to sort the new energy grid-connected lines in the sets S1 and S2 according to an order from large to small of the oscillation power amplitude ratio;

[0135] A judgment module is configured to judge whether the new energy exists oscillation, whether the oscillation is suppressed after control, and whether the new energy collection station of the current selection participates in subsequent round control;

[0136] A communication module is configured to realize millisecond-level communication between devices of different plants and stations.

[0137] Embodiment 3

[0138] Referring to Figure 5 The embodiment 3 of the present application provides a new energy sending area broadband oscillation coordination control system, which runs a new energy sending area broadband oscillation coordination control method, comprising:

[0139] A control master station is deployed at a new energy sending area hub substation;

[0140] A control substation is deployed at a new energy collection station or a new energy plant station;

[0141] A communication medium is configured to provide a physical link for communication between the control master station and the control substation, and realize millisecond-level communication between devices of different plants and stations.

[0142] Embodiment 4

[0143] The embodiment 4 of the present application provides a computer readable storage medium, which stores a computer program, characterized by: the computer program is executed by a processor to realize the new energy sending area broadband oscillation coordination control method.

[0144] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit it. Although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement should be covered in the protection scope of the claims of the present application.

Claims

1. A method for wide-area oscillation coordination control in a new energy sending-out area, characterized in that, Comprising: Step 1: Monitor the oscillation characteristic quantity of the regional power grid tie line, judge whether there is oscillation in the regional power grid tie line, if there is no oscillation, continue to monitor the regional power grid tie line; if there is oscillation, collect the voltage and current signals of the out-of-line of the collection station and the new energy grid-connected line, and obtain the fundamental characteristic quantity and the oscillation characteristic quantity of the line; Step 2: Calculate the oscillation mode power of the out-of-line of the collection station and the amplitude ratio of the oscillation power of the new energy grid-connected line; Step 3: According to the direction and size of the oscillation mode power of the out-of-line of the collection station, the emergency control measure set S1 and S2 are selected; Step 4: Eliminate the new energy grid-connected line in the emergency control measure set S1 and S2 which is shut down or does not exist oscillation; Step 5: According to the order from large to small of the amplitude ratio of the oscillation power, the new energy grid-connected lines in the emergency control measure set S1 and S2 are sorted respectively, and the new energy grid-connected lines in the emergency control measure set S1 are arranged before the emergency control measure set S2 as a whole; Step 6: Cut off the new energy grid-connected line with the highest order, and determine the control range of the next round according to the control effect of this round; Step 7: Repeat the above steps until the oscillation is controlled.

2. The new energy sending area wide frequency oscillation coordinated control method according to claim 1, characterized in that: In step 2, the calculation of the oscillation mode power of the out-of-line of the collection station includes: When the oscillation voltage amplitude is lower than the set proportion of the rated voltage or the oscillation current amplitude is lower than the set proportion of the rated current, the formula (2) is used to calculate the oscillation mode power of the out-of-line of the collection station; otherwise, the formula (1) is used to calculate the oscillation mode power of the out-of-line of the collection station: P m_WF0 (t) = P m_DC (t) - P m_0 (t) (2) Wherein: P m_WF0 (t) is the power of the oscillation mode of the outlet of the collection station m, U m_WF (t) is the amplitude of the oscillating voltage at the output of the collection station m, I m_WF (t) is the oscillating current amplitude of the outlet of the collection station m, θ m_WF to collect the phase angle difference of the outgoing oscillation voltage and oscillation current of the station m, P m_DC (t) is the direct current component of the power at the output of the collection station m, P m_0 (t) is the fundamental power at the output of the collection station m.

3. The new energy sending area wide frequency oscillation coordinated control method according to claim 1 or 2, characterized in that: In step 2, the calculation of the amplitude ratio of the oscillation power of the new energy grid-connected line is expressed by the following formula (3): Wherein, P mn_WF_REL (t) is the ratio of the amplitude of the oscillating power of the new energy grid-connected line n of the collection station m, P mn_WF (t) is the amplitude of the oscillating power of the new energy grid-connected line n of the collection station m, P mn_0 (t) is the fundamental power of the new energy grid-connected line n of the collection station m.

4. The new energy sending area wide frequency oscillation coordinated control method according to claim 1, characterized in that: Step 3 includes: setting an oscillation mode power threshold, if the oscillation mode power of the out-of-line of the collection station is positive and greater than the oscillation mode power threshold, the new energy grid-connected line of the collection station is included in the emergency control measure set S1; if the oscillation mode power of the out-of-line of the collection station is negative and the absolute value is greater than the oscillation mode power threshold, the new energy grid-connected line of the collection station is included in the emergency control measure set S2; otherwise, the new energy grid-connected line of the collection station is not included in the emergency control measure set.

5. The new energy sending area wide frequency oscillation coordinated control method according to claim 1 or 4, characterized in that: Step 4 includes: setting a judgment oscillation existence threshold, if the amplitude ratio of the oscillation of the new energy grid-connected line exceeds the judgment oscillation existence threshold, it is judged that the new energy grid-connected line exists oscillation; otherwise, it is judged that the new energy grid-connected line does not exist oscillation.

6. The new energy sending area wide frequency oscillation coordinated control method according to claim 1, characterized in that: Step 6 includes judging whether the oscillation of the regional power grid interconnection line after the new energy grid-connected line is cut off is suppressed, and dynamically adjusting the control range according to the oscillation suppression condition, specifically including: if the oscillation is suppressed, the new energy collection station selected in the current round is still allowed to be included in the subsequent round of emergency control measure set; otherwise, the new energy collection station selected in the current round is no longer included in the subsequent round of emergency control measure set.

7. The new energy sending area wide frequency oscillation coordinated control method according to claim 6, characterized in that: the step 6 includes: if the oscillation amplitude of the regional power grid interconnection line monitored by the new energy hub substation after the new energy grid-connected line is cut off in the current round is reduced, it is judged that the oscillation is suppressed, otherwise it is judged that the oscillation is not suppressed.

8. A new energy sending-out area wide frequency oscillation coordination control device, characterized in that, including: a data acquisition and analysis module for acquiring voltage and current signals of the collection station out line and the new energy grid-connected line, and obtaining the fundamental characteristic quantity and the oscillation characteristic quantity of the line; a calculation module for calculating the oscillation modal power of the collection station out line and the oscillation power amplitude ratio of the new energy grid-connected line; a screening module for screening the emergency control measure set S1 and S2 according to the size of the oscillation modal power of the collection station out line; a sorting module for sorting the new energy grid-connected lines in the sets S1 and S2 according to the oscillation power amplitude ratio from large to small; a judgment module for judging whether the new energy exists oscillation, whether the oscillation is suppressed after control, and whether the new energy collection station selected in the current round participates in the subsequent round of control; a communication module for realizing millisecond-level communication between devices of different plants and stations.

9. A new energy sending-out area wide frequency oscillation coordination control system, which operates a new energy sending-out area wide frequency oscillation coordination control method according to any one of claims 1-7, characterized in that, including: a control master station deployed in the new energy sending area hub substation; a control substation deployed in the new energy collection station; a communication medium for providing a physical link for communication between the control master station and the control substation, and realizing millisecond-level communication between devices of plants and stations.

10. A computer readable storage medium storing a computer program, characterized in that: The computer program is executed by the processor to run the new energy sending area wide frequency oscillation coordinated control method according to any one of claims 1-7.

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