CN109307825A - A kind of method and system obtaining soft straight power grid direct current monopolar line failure measure amount - Google Patents

Abstract

The invention discloses a kind of method and system for obtaining soft straight power grid direct current monopolar line failure measure amount, belong to power system security stability control techniques field.The method of the present invention comprises determining that soft straight power grid Safety system topological structure；The calculating data of soft straight power grid Safety system failure measure amount are obtained according to topological structure；Variable is calculated according to the soft straight power grid Safety system failure measure amount of converter blocking fault definition；Failure measure amount is obtained according to calculating data and calculating variable.This invention ensures that correct failure measure amount can be calculated in flexible direct current power grid Safety system its Safety system when converter blocking failure occurs, it can be with the safe and stable operation of effective guarantee flexible direct current power grid.

Description

A kind of method and system obtaining soft straight power grid direct current monopolar line failure measure amount

Technical field

The present invention relates to power system security stability control techniques fields, and relate more specifically to a kind of soft straight electricity of acquisition The method and system of net direct current monopolar line failure measure amount.

Background technique

The grid-connected transmission of extensive generation of electricity by new energy is of great significance with consumption.Flexible DC transmission is a kind of advanced HVDC Transmission Technology forms flexible direct current power grid based on flexible DC transmission technology, different geographical, different types of may be implemented New-energy grid-connected collects, and realization stabilizes new energy and goes out the functions such as fluctuation.Therefore, flexible direct current power grid is in new energy power generation grid-connection Consumption aspect has significant advantage, is one of the important directions of the following power network development.

Electric system security control device be the continuous development with power grid and developed a kind of raising power grid security, stabilization Horizontal ancillary technique.Electric system security control device is mainly used for wide area to improve power grid security, maintenance level as the main purpose Multiple plant stands or single plant stand Transient Stability Control.Security control device is made of a main website and several substations, execution station, Its function is the realization process includes: power grid real-time traffic information and fault information acquisition, breakdown judge, failure measure amount calculate, refer to Order assigns, instruction execution.Wherein, the calculating of failure measure amount is the core function of security control device.

The effect of soft straight power grid Safety system is to carry out event by acquiring soft straight power grid real-time traffic information and fault message Barrier differentiates, carries out the calculating of failure measure amount according to fault type, the failure of soft straight power grid is realized by cutting the measures such as machine, cutting load It passes through, guarantees the safe and stable operation of soft straight network system.

At present for flexible direct current electricity power engineering, lack the design method of its security control device, especially lacks it in failure feelings The calculation method of Safety system failure measure amount under condition, this missing will seriously threaten the safe, steady of flexible direct current electricity power engineering Determine operation level.

Summary of the invention

It is an object of the invention to solve at present to lack under converter blocking fault condition flexible direct current electricity power engineering The problem of Safety system failure measure amount calculation method, ensures the safe and stable operation of flexible direct current electricity power engineering, proposes one Planting the method for obtaining soft straight power grid direct current monopolar line failure measure amount includes:

Determine soft straight power grid Safety system topological structure；

The calculating data of soft straight power grid Safety system direct current monopolar line failure measure amount are obtained according to topological structure；

Variable is calculated according to the soft straight power grid Safety system direct current monopolar line failure measure amount of converter blocking fault definition；

Direct current monopolar line failure measure amount is obtained according to calculating data and calculating variable.

Optionally, soft straight power grid Safety system topological structure include: the soft straight true bipolar topology of power grid Safety system and The soft true monopole topological structure of straight power grid Safety system.

Optionally, calculating data includes:

Converter station Si, wherein i be i-th of converter station, i=1,2,3,4...n；

Converter station Si anode layer inverter Si_P variable: maximum power P_{Smax_i_P}, run power P before failure_{S0_i_P}, it is maximum Turn band quantity of power Δ P_{S_i_P}With significance bit V_{S_i_P}；

Converter station Si negative electrode layer inverter Si_N variable: maximum power P_{Smax_i_N}, run power P before failure_{S0_i_N}, it is maximum Turn band quantity of power Δ P_{S_i_N}And V_{S_i_N}Significance bit；

Route Li, wherein i be i-th DC power transmission line, i=1,2,3,4...n；

Route Li anode layer transmission line of electricity Li_P variable: maximum power P_Lmax, initial launch power P_{L0_i_P}And significance bit V_{L_i_P}；

Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power P_Lmax, initial launch power P_{L0_i_N}And significance bit V_{L_i_N}；

The converter station Si variable, which puts into operation, is set to 1, exits and is set to 0.

Optionally, the calculating variable of definition includes:

System imbalance power is Δ P, non-faulting pole layer inverter maximum turns with power to be Δ P '_{S_i_max}, wherein Δ P’_{S_i_max}=Δ P_{S_i_x′}=V_{S_i_x′}×(P_{Smax_i_x′}-P_{S0_i_x′}), the maximum band power that turns of non-faulting pole layer be Δ P '_∑maxM, Middle Δ P '_∑maxM=V_{S_3_x′}×(P_{Smax_3_x′}-P_{S0_3_x′})+V_{S_4_x′}×(P_{Smax_4_x′}-P_{S0_4_x′}), non-faulting pole sandwich circuit it is maximum Turning band power is Δ P '_∑maxL, wherein Δ P '_∑maxL=V_{L_1_x′}×(P_Lmax-P_{L0_1_x′})+V_{L_2_x′}×(P_Lmax-P_{L0_2_x′}), system Can turn band power is Δ P_trans, wherein Δ P_trans=min { Δ P '_{S_i_max}, Δ P '_∑maxM, Δ P '_∑maxLAnd failure measure amount be Ptrip。

Optionally, calculating failure measure measurer body according to calculating data and calculating variable includes:

If route L_iFailure, then its V_{L_i_x}Become 0 from 1；

Remember route in destiny K=V_{L_1_x}+V_{L_2_x}+V_{L_3_x}+V_{L_4_x}；

As K=3；

Work as V_{L_1_x}+V_{L_2_x}=1 and P_{L0_1_P}+P_{L0_2_P}> P_Lmax, then failure measure amount P_trip=P_{L0_1_P}+P_{L0_2_P}-P_Lmax- ΔP_trans；

As K=2；

Work as V_{L_1_x}+V_{L_2_x}When=0, V_{S_1_x}+V_{S_2_x}=2 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip= P_{S0_1_x}+P_{S0_2_x}-ΔP_trans；

Work as V_{L_3_x}+V_{L_4_x}When=0,

V_{S_1_x}+V_{S_3_x}=1, V_{S_1_x}=1 and P_{S0_1_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}-ΔP_trans,

V_{S_2_x}+V_{S_4_x}=1, V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount

Work as V_{L_1_x}+V_{L_4_x}When=0,

V_{S_4_}X=0, P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans；

V_{S_4_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_4_x}, Δ P > 0 and Δ P_trans≤ Δ P then converter station S₁Failure is arranged Shi LiangConverter station S₂Failure measure amount

Work as V_{L_1_x}+V_{L_3_x}When=0,

V_{S_1_x}=1 and P_{S0_1_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_3_x}When=0,

V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_2_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_4_x}When=0,

V_{S_3_x}=0 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans

V_{S_3_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_3_x}, Δ P > 0 and Δ P_trans≤ Δ P then converter station S₁Failure is arranged Shi LiangConverter station S₂Failure measure amount

The present invention also provides a kind of system for obtaining soft straight power grid direct current monopolar line failure measure amount, the system packets It includes:

It determines topological structure module, determines soft straight power grid Safety system topological structure；

Data module is obtained, soft straight power grid Safety system direct current monopolar line failure measure amount is obtained according to topological structure Calculate data；

Variable module is obtained, is arranged according to the soft straight power grid Safety system direct current monopolar line failure of converter blocking fault definition The amount of applying calculates variable；

Failure measure amount module is obtained, obtains direct current monopolar line failure measure amount according to calculating data and calculating variable.

Optionally, soft straight power grid Safety system topological structure include: the soft straight true bipolar topology of power grid Safety system and The soft true monopole topological structure of straight power grid Safety system.

Optionally, calculating data includes:

Converter station Si, wherein i be i-th of converter station, i=1,2,3,4...n；

Converter station Si anode layer inverter Si_P variable: maximum power P_{Smax_i_P}, power P S is run before failure_{0_i_P}, it is maximum Turn band quantity of power Δ P_{S_i_P}With significance bit V_{S_i_P}；

Converter station Si negative electrode layer inverter Si_N variable: maximum power P_{Smax_i_N}, run power P before failure_{S0_i_N}, it is maximum Turn band quantity of power Δ P_{S_i_N}And V_{S_i_N}Significance bit；

Route Li, wherein i be i-th DC power transmission line, i=1,2,3,4...n；

Route Li anode layer transmission line of electricity Li_P variable: maximum power P_Lmax, initial launch power P L_{0_i_P}And significance bit V_{L_i_P}；

Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power P_Lmax, initial launch power P L_{0_i_N}And significance bit V_{L_i_N}；

The converter station Si and route Li variable put into operation and are set to 1, exit and are set to 0.

Optionally, the calculating variable of definition includes:

System imbalance power is Δ P, non-faulting pole layer inverter maximum turns with power to be Δ P '_{S_i_max}, wherein Δ P’_{S_i_max}=Δ P_{S_i_x′}=V_{S_i_x′}×(P_{Smax_i_x′}-P_{S0_i_x′}), the maximum band power that turns of non-faulting pole layer be Δ P '_∑maxM, Middle Δ P '_∑maxM=V_{S_3_x′}×(P_{Smax_3_x′}-P_{S0_3_x′})+V_{S_4_x′}×(P_{Smax_4_x′}-P_{S0_4_x′}), non-faulting pole sandwich circuit it is maximum Turning band power is Δ P '_∑maxL, wherein Δ P '_∑maxL=V_{L_1_x′}×(P_Lmax-P_{L0_1_x′})+V_{L_2_x′}×(P_Lmax-P_{L0_2_x}'), system Can turn band power is Δ P_trans, wherein Δ P_trans=min { Δ P '_{S_i_max}, Δ P '_∑maxM, Δ P '_∑maxLAnd failure measure amount be Ptrip。

Optionally, calculating failure measure measurer body according to calculating data and calculating variable includes:

If route L_iFailure, then its V_{L_i_x}Become 0 from 1；

Remember route in destiny K=V_{L_1_x}+V_{L_2_x}+V_{L_3_x}+VL_{_4_x}；

As K=3；

Work as V_{L_1_x}+V_{L_2_x}=1 and P_{L0_1_P}+P_{L0_2_P}> P_Lmax, then failure measure amount P_trip=P_{L0_1_P}+P_{L0_2_P}-P_Lmax- ΔP_trans；

As K=2；

Work as V_{L_1_x}+V_{L_2_x}When=0, V_{S_1_x}+VS_{_2_x}=2 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip =P_{S0_1_}x+P_{S0_2_x}-ΔP_trans；

Work as V_{L_3_x}+V_{L_4_x}When=0,

V_{S_1_x}+V_{S_3_x}=1, V_{S_1_x}=1 and P_{S0_1_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}-ΔP_trans,

V_{S_2_x}+V_{S_4_x}=1, V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount

Work as V_{L_1_x}+V_{L_4_x}When=0,

V_{S_4_x}=0, P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans；

V_{S_4_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_4_x}, Δ P > 0 and Δ P_trans≤ Δ P then converter station S₁Failure is arranged Shi LiangConverter station S₂Failure measure amount

Work as V_{L_1_x}+V_{L_3_x}When=0,

V_{S_1_x}=1 and P_{S0_1_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_3_x}When=0,

V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_2_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_4_x}When=0,

V_{S_3_x}=0 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans

V_{S_3_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_3_x}, Δ P > 0 and Δ P_trans≤ Δ P then converter station S₁Failure is arranged Shi LiangConverter station S₂Failure measure amount

This invention ensures that its Safety system can be with when converter blocking failure occurs for flexible direct current power grid Safety system Correct failure measure amount is calculated, it can be with the safe and stable operation of effective guarantee flexible direct current power grid.

Detailed description of the invention

Fig. 1 is a kind of soft straight power grid peace control system of method for obtaining soft straight power grid direct current monopolar line failure measure amount of the present invention It unites true bipolar topology structure chart；

Fig. 2 is a kind of soft straight power grid peace control system of method for obtaining soft straight power grid direct current monopolar line failure measure amount of the present invention It unites true bipolar topology engineering connection figure；

Fig. 3 is a kind of method flow diagram for obtaining soft straight power grid direct current monopolar line failure measure amount of the present invention；

Fig. 4 is a kind of system construction drawing for obtaining soft straight power grid direct current monopolar line failure measure amount of the present invention.

Specific embodiment

The present invention provides a kind of method for obtaining soft straight power grid direct current monopolar line failure measure amount, as shown in figure 3, packet It includes:

Soft straight power grid Safety system topological structure is determined, wherein soft straight power grid Safety system topological structure includes: soft straight electricity The true bipolar topology of net Safety system and the soft true monopole topological structure of straight power grid Safety system；

Flexible direct current power grid generally uses true bipolar topology, and converter station number is greater than 3, and the present invention is true with four ends It is introduced for bipolar soft straight looped network engineering, topological structure is as shown in Figure 1, four flexible direct current converter stations S1, S2, S3, S4 Composition flexible direct current annular power grid is connected through DC power transmission line L1, L2, L3, L4, flexible direct current annular power grid of the present invention uses True dipolar configuration, each converter station includes anode layer inverter and negative electrode layer inverter, and two inverter exchange sides are mutual Connection；DC power transmission line includes anode layer DC power transmission line and negative electrode layer DC power transmission line, every DC line both ends It is installed with dc circuit breaker.Each pole layer shares 4 converter stations, 4 routes, 8 dc circuit breakers.

By taking single pole layer as an example, specific connection type is as shown in Figure 2, wherein the DC power transmission line group cyclization of homopolarity layer Dc circuit breaker is installed at net, every DC line both ends, when ground fault or maintenance occur for DC line, can pass through disconnection The dc circuit breaker at its both ends is isolated；Inverter is connected to the looped network of DC line composition by mechanical high-speed switch, After inverter is because of failure or maintenance locking, by disconnecting mechanical high-speed switch, which can be cut from looped network of DC power It removes, the node on looped network is not impacted.

Because the exchange side of same converter station positive and negative electrode layer inverter is connected, and the power distribution between two inverters be can Control amount, therefore when a certain pole layer inverter, which can transport capacity because of failure and other reasons, to be reduced, it can be by extra power through another pole Layer inverter conveying, the process are known as " power turns band ", turn band by the power between inverter, it can be achieved that the power of pole interlayer turns Band.

The calculating data of soft straight power grid Safety system direct current monopolar line failure measure amount are obtained according to topological structure；

Wherein, calculating data includes:

Converter station Si, wherein i be i-th of converter station, i=1,2,3,4...n；

Converter station Si anode layer inverter Si_P variable: maximum power P_{Smax_i_P}, power P S is run before failure_{0_i_P}, it is maximum Turn band quantity of power Δ P_{S_i_P}With significance bit V_{S_i_P}；

Converter station Si negative electrode layer inverter Si_N variable: maximum power P_{Smax_i_N}, power P S is run before failure_{0_i_N}, it is maximum Turn band quantity of power Δ P_{S_i_N}And V_{S_i_N}Significance bit；

Route Li, wherein i be i-th DC power transmission line, i=1,2,3,4...n；

Route Li anode layer transmission line of electricity Li_P variable: maximum power P_Lmax, initial launch power P L_{0_i_P}And significance bit V_{L_i_P}；

Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power P_Lmax, initial launch power P L_{0_i_N}And significance bit V_{L_i_N}；

The converter station Si and route Li variable put into operation and are set to 1, exit and are set to 0.

Variable is calculated according to the soft straight power grid Safety system direct current monopolar line failure measure amount of converter blocking fault definition；

The calculating variable of definition includes:

System imbalance power is Δ P, non-faulting pole layer inverter maximum turns with power to be Δ P '_{S_i_max}, wherein Δ P’_{S_i_max}=Δ P_{S_i_x′}=V_{S_i_x′}×(P_{Smax_i_x′}-P_{S0_i_x′}), the maximum band power that turns of non-faulting pole layer be Δ P '_∑maxM, Middle Δ P '_∑maxM=V_{S_3_x′}×(P_{Smax_3_x′}-P_{S0_3_x′})+V_{S_4_x′}×(P_{Smax_4_x′}-P_{S0_4_x′}), non-faulting pole sandwich circuit it is maximum Turning band power is Δ P '_∑maxL, wherein Δ P '_∑maxL=V_{L_1_x′}×(P_Lmax-P_{L0_1_x′})+V_{L_2_x′}×(P_Lmax-P_{L0_2_x′}), system Can turn band power is Δ P_trans, wherein Δ P_trans=min { Δ P '_{S_i_max}, Δ P '_∑maxM, Δ P '_∑maxLAnd failure measure amount be Ptrip。

Wherein, system imbalance power be Δ P: refer to because failure caused by imbalance power, need to the Partial Power into Row turns band；If band underpower can be turned, carry out cutting sending end blower；

It is Δ P ' that non-faulting pole layer inverter maximum, which turns band power,_{S_i_max}: refer to the inverter for breaking down, non-event Hinder the remaining Capacity Margin of pole layer inverter, i.e. inverter maximum turns band quantity of power Δ P_{S_i_x}；

The layer maximum band power that turns in non-faulting pole is Δ P '_∑maxM: refer to that all inverters of layer remaining capacity in non-faulting pole is abundant The sum of degree, i.e. the pole interlayer maximum of consideration inverter capacity limit can turn band power；

It is Δ P ' that non-faulting pole sandwich circuit maximum, which turns band power,_∑maxL: after referring to that consideration turns band, non-faulting pole each direct current of layer Minimum value in capacity of trunk nargin, i.e. the pole interlayer maximum of consideration DC line capacity limit can turn band power；

It is Δ P that system, which can turn band power,_trans: can turn band power is Δ P '_{S_i_max}、ΔP’_∑maxM、ΔP’_∑maxLIn three Minimum value；

Failure measure amount is Ptrip: referring to the power of fan that sending end needs to cut off, for system imbalance power and can turn band function The difference of rate, if system imbalance power is less than the difference that can turn band power, cutting machine amount is 0.

Direct current monopolar line failure measure amount is obtained according to calculating data and calculating variable, is specifically included:

If route L_iFailure, then its V_{L_i_x}Become 0 from 1；

Remember route in destiny K=V_{L_1_x}+V_{L_2_x}+V_{L_3_x}+V_{L_4_x}；

As K=3；

Work as V_{L_1_x}+V_{L_2_x}=1 and P_{L0_1_P}+P_{L0_2_P}> P_Lmax, then failure measure amount P_trip=P_{L0_1_P}+P_{L0_2_P}-P_Lmax- ΔP_trans；

As K=2；

Work as V_{L_1_x}+V_{L_2_x}When=0, V_{S_1_x}+V_{S_2_x}=2 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip= P_{S0_1_x}+P_{S0_2_x}-ΔP_trans；

Work as V_{L_3_x}+V_{L_4_x}When=0,

V_{S_1_x}+V_{S_3_x}=1, V_{S_1_x}=1 and P_{S0_1_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}-ΔP_trans,

V_{S_2_x}+V_{S_4_x}=1, V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount

Work as V_{L_1_x}+V_{L_4_x}When=0,

V_{S_4_x}=0, P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans；

V_{S_4_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_4_x}, Δ P > 0 and Δ P_trans≤ Δ P then converter station S₁Failure is arranged Shi LiangConverter station S₂Failure measure amount

Work as V_{L_1_x}+V_{L_3_x}When=0,

V_{S_1_x}=1 and P_{S0_1_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_3_x}When=0,

V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_2_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_4_x}When=0,

V_{S_3_x}=0 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans

V_{S_3_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_3_x}, Δ P > 0 and P_trans≤ Δ P then converter station S₁Failure measure AmountConverter station S₂Failure measure amount

Also a kind of system 200 for obtaining soft straight power grid direct current monopolar line failure measure amount of the present invention, as shown in figure 4, being System includes:

It determines topological structure module 201, determines soft straight power grid Safety system topological structure, wherein soft straight power grid peace control system Topological structure of uniting includes: the true bipolar topology of soft straight power grid Safety system and the soft true monopole topology knot of straight power grid Safety system Structure.

Data module 202 is obtained, soft straight power grid Safety system direct current monopolar line failure measure is obtained according to topological structure The calculating data of amount, wherein calculating data includes:

Converter station Si, wherein i be i-th of converter station, i=1,2,3,4...n；

Converter station Si anode layer inverter Si_P variable: maximum power P_{Smax_}i_{_P}, run power P before failure_{S0_i_P}, it is maximum Turn band quantity of power Δ P_{S_i_P}With significance bit V_{S_i_P}；

Converter station Si negative electrode layer inverter Si_N variable: maximum power P_{Smax_i_N}, run power P before failure_{S0_i_N}, it is maximum Turn band quantity of power Δ P_{S_i_N}And V_{S_i_N}Significance bit；

Route Li, wherein i be i-th DC power transmission line, i=1,2,3,4...n；

Route Li anode layer transmission line of electricity Li_P variable: maximum power P_Lmax, initial launch power P_{L0_i_P}And significance bit V_{L_i_P}；

Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power P_Lmax, initial launch power P_{L0_i_N}And significance bit V_{L_i_N}；

The converter station Si variable, which puts into operation, is set to 1, exits and is set to 0.

Variable module 203 is obtained, according to the soft straight power grid Safety system direct current monopolar line event of converter blocking fault definition Barrier measure amount calculate variable, wherein the calculating variable of definition include: system imbalance power be Δ P, non-faulting pole layer inverter It is Δ P ' that maximum, which turns band power,_{S_i_max}, wherein Δ P '_{S_i_max}=Δ P_{S_i_x′}=V_{S_i_x′}×(P_{Smax_i_x′}-P_{S0_i_x′}), non-faulting The layer maximum band power that turns in pole is Δ P '_∑maxM, wherein Δ P '_∑maxM=V_{S_3_x′}×(P_{Smax_3_x′}-P_{S0_3_x′})+V_{S_4_x′}× (P_{Smax_4_x′}-P_{S0_4_x′}), non-faulting pole sandwich circuit maximum turn band power be Δ P '_∑maxL, wherein Δ P '_∑maxL=V_{L_1_x′}× (P_Lmax-P_{L0_1_x′})+V_{L_2_x′}×(P_Lmax-P_{L0_2_x′}), system can turn band power be Δ P_trans, wherein Δ P_trans=min { Δ P’_{S_i_max,}ΔP’_∑maxM, Δ P '_∑maxLAnd failure measure amount be Ptrip.

System imbalance power is Δ P: being referred to because imbalance power caused by failure, need to turn the Partial Power Band；If band underpower can be turned, carry out cutting sending end blower；

It is Δ P ' that non-faulting pole layer inverter maximum, which turns band power,_{S_i_max}: refer to the inverter for breaking down, non-event Hinder the remaining Capacity Margin of pole layer inverter, i.e. inverter maximum turns band quantity of power Δ P_{S_i_x}；

The layer maximum band power that turns in non-faulting pole is Δ P '_∑maxM: refer to that all inverters of layer remaining capacity in non-faulting pole is abundant The sum of degree, i.e. the pole interlayer maximum of consideration inverter capacity limit can turn band power；

It is Δ P ' that non-faulting pole sandwich circuit maximum, which turns band power,_∑maxL: after referring to that consideration turns band, non-faulting pole each direct current of layer Minimum value in capacity of trunk nargin, i.e. the pole interlayer maximum of consideration DC line capacity limit can turn band power；

It is Δ P that system, which can turn band power,_trans: can turn band power is Δ P '_{S_i_max}、ΔP’_∑maxM、ΔP’_∑maxLIn three Minimum value；

Failure measure amount is Ptrip: referring to the power of fan that sending end needs to cut off, for system imbalance power and can turn band function The difference of rate, if system imbalance power is less than the difference that can turn band power, cutting machine amount is 0.

Failure measure amount module 204 is obtained, obtains direct current monopolar line failure measure according to calculating data and calculating variable Amount.It specifically includes:

If route L_iFailure, then its V_{L_i_x}Become 0 from 1；

Remember route in destiny K=V_{L_1_x}+V_{L_2_x}+V_{L_3_x}+V_{L_4_x}；

As K=3；

Work as V_{L_1_x}+V_{L_2_x}=1 and P_{L0_1_P}+P_{L0_2_P}> P_Lmax, then failure measure amount P_trip=P_{L0_1_P}+P_{L0_2_P}-P_Lmax- ΔP_trans；

As K=2；

Work as V_{L_1_x}+V_{L_2_x}When=0, V_{S_1_x}+V_{S_2_x}=2 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip= P_{S0_1_x}+P_{S0_2_x}-ΔP_trans；

Work as V_{L_3_x}+V_{L_4_x}When=0,

V_{S_1_x}+V_{S_3_x}=1, V_{S_1_x}=1 and P_{S0_1_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}-ΔP_trans,

V_{S_2_x}+V_{S_4_x}=1, V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount

Work as V_{L_1_x}+V_{L_4_x}When=0,

V_{S_4_x}=0, P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans；

V_{S_4_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_4_x}, Δ P > 0 and Δ P_trans≤ Δ P then converter station S₁Failure is arranged Shi LiangConverter station S₂Failure measure amount

Work as V_{L_1_x}+V_{L_3_x}When=0,

V_{S_1_x}=1 and P_{S0_1_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_3_x}When=0,

V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_2_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_4_x}When=0,

V_{S_3_x}=0 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans

V_{S_3_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_3_x}, Δ P > 0 and Δ P_trans≤ Δ P then converter station S₁Failure is arranged Shi LiangConverter station S₂Failure measure amount

This invention ensures that its Safety system can be with when converter blocking failure occurs for flexible direct current power grid Safety system Correct failure measure amount is calculated, it can be with the safe and stable operation of effective guarantee flexible direct current power grid.

Claims (10)

1. a kind of method for obtaining soft straight power grid direct current monopolar line failure measure amount, which comprises

Determine soft straight power grid Safety system topological structure；

The calculating data of soft straight power grid Safety system direct current monopolar line failure measure amount are obtained according to topological structure；

Variable is calculated according to the soft straight power grid Safety system direct current monopolar line failure measure amount of converter blocking fault definition；

Direct current monopolar line failure measure amount is obtained according to calculating data and calculating variable.

2. according to the method described in claim 1, the soft straight power grid Safety system topological structure includes: soft straight power grid peace control The true bipolar topology of system and the soft true monopole topological structure of straight power grid Safety system.

3. according to the method described in claim 1, the calculating data include:

Converter station Si, wherein i be i-th of converter station, i=1,2,3,4...n；

Converter station Si anode layer inverter Si_P variable: maximum power P_{Smax_i_P}, run power P before failure_{S0_i_P}, maximum turn band Quantity of power Δ P_{S_i_P}With significance bit V_{S_i_P}；

Converter station Si negative electrode layer inverter Si_N variable: maximum power P_{Smax_i_N}, run power P before failure_{S0_i_N}, maximum turn band Quantity of power Δ P_{S_i_N}And V_{S_i_N}Significance bit；

Route Li, wherein i be i-th DC power transmission line, i=1,2,3,4...n；

Route Li anode layer transmission line of electricity Li_P variable: maximum power P_Lmax, initial launch power P_{L0_i_P}With significance bit V_{L_i_P}；

Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power P_Lmax, initial launch power P_{L0_i_N}With significance bit V_{L_i_N}；

The converter station Si and route Li variable put into operation and are set to 1, exit and are set to 0.

4. according to the method described in claim 1, the calculating variable of the definition includes:

System imbalance power is Δ P, non-faulting pole layer inverter maximum turns with power to be Δ P '_{S_i_max}, wherein Δ P '_{S_i_max} =Δ P_{S_i_x}'=V_{S_i_x}′×(P_{Smax_i_x}′-P_{S0_i_x}'), the maximum band power that turns of non-faulting pole layer be Δ P '_∑maxM, wherein Δ P′_∑maxM=V_{S_3_x}′×(P_{Smax_3_x}′-P_{S0_3_x}′)+V_{S_4_}x′×(P_{Smax_4_}x′-P_{S0_4_}X '), non-faulting pole sandwich circuit it is maximum Turning band power is Δ P '_∑maxL, wherein Δ P '_∑maxL=V_{L_1_x}′×(P_Lmax-P_{L0_1_x}′)+V_{L_2_x}′×(P_Lmax-P_{L0_2_x}'), be It is Δ P that system, which can turn band power,_trans, wherein Δ P_trans=min { Δ P '_{S_i_max}, Δ P '_∑maxM, Δ P '_∑maxLAnd failure measure amount For Ptrip.

5. according to the method described in claim 1, described calculate failure measure measurer body according to calculating data and calculating variable Include:

If route L_iFailure, then its V_{L_i_x}Become 0 from 1；

Remember route in destiny K=V_{L_1_x}+V_{L_2_x}+V_{L_3_x}+V_{L_4_x}；

As K=3；

Work as V_{L_1_x}+V_{L_2_x}=1 and P_{L0_1_P}+P_{L0_2_P}> P_Lmax, then failure measure amount P_trip=P_{L0_1_P}+P_{L0_2_P}-P_Lmax-Δ P_trans；

As K=2；

Work as V_{L_1_x}+V_{L_2_x}When=0, V_{S_1_x}+V_{S_2_x}=2 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip= P_{S0_1_x}+P_{S0_2_x}-ΔP_trans；

Work as V_{L_3_x}+V_{L_4_x}When=0,

V_{S_1_x}+V_{S_3_x}=1, V_{S_1_x}=1 and P_{S0_1_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}-ΔP_trans,

V_{S_2_x}+V_{S_4_x}=1, V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount

Work as V_{L_1_x}+V_{L_4_x}When=0,

V_{S_4_x}=0, P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans；

V_{S_4_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_4_x}, Δ P > 0 and Δ P_trans≤ Δ P then converter station S₁Failure measure amountConverter station S₂Failure measure amount

Work as V_{L_1_x}+V_{L_3_x}When=0,

V_{S_1_x}=1 and P_{S0_1_x}> Δ Ptrans then failure measure amount P_trip=P_{S0_1_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_3_x}When=0,

V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_2_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_4_x}When=0,

V_{S_3_x}=0 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans

V_{S_3_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_3_x}, Δ P > 0 and P_trans≤ Δ P then converter station S₁Failure measure amountConverter station S₂Failure measure amount

6. a kind of system for obtaining soft straight power grid direct current monopolar line failure measure amount, the system comprises:

It determines topological structure module, determines soft straight power grid Safety system topological structure；

Data module is obtained, the calculating of soft straight power grid Safety system direct current monopolar line failure measure amount is obtained according to topological structure Data；

Variable module is obtained, according to the soft straight power grid Safety system direct current monopolar line failure measure amount of converter blocking fault definition Calculate variable；

Failure measure amount module is obtained, obtains direct current monopolar line failure measure amount according to calculating data and calculating variable.

7. system according to claim 6, the soft straight power grid Safety system topological structure includes: soft straight power grid peace control The true bipolar topology of system and the soft true monopole topological structure of straight power grid Safety system.

8. system according to claim 6, the calculating data include:

Converter station Si, wherein i be i-th of converter station, i=1,2,3,4...n；

Converter station Si anode layer inverter Si_P variable: maximum power P_{Smax_i_P}, run power P before failure_{S0_i_P}, maximum turn band Quantity of power Δ P_{S_i_P}With significance bit V_{S_i_P}；

Converter station Si negative electrode layer inverter Si_N variable: maximum power P_{Smax_i_N}, run power P before failure_{S0_i_N}, maximum turn band Quantity of power Δ P_{S_i_N}And V_{S_i_N}Significance bit；

Route Li, wherein i be i-th DC power transmission line, i=1,2,3,4...n；

Route Li anode layer transmission line of electricity Li_P variable: maximum power P_Lmax, initial launch power P_{L0_i_P}With significance bit V_{L_i_P}；

Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power P_Lmax, initial launch power P_{L0_i_N}With significance bit V_{L_i_N}；

The converter station Si variable, which puts into operation, is set to 1, exits and is set to 0.

9. the calculating variable of system according to claim 6, the definition includes:

System imbalance power is Δ P, non-faulting pole layer inverter maximum turns with power to be Δ P '_{S_i_max}, wherein Δ P '_{S_i_max} =Δ P_{S_i_x}'=V_{S_i_x}′×(P_{Smax_i_x}′-P_{S0_i_x}'), the maximum band power that turns of non-faulting pole layer be Δ P '_∑maxM, wherein Δ P′_∑maxM=V_{S_3_x′}×(P_{Smax_3_x′}-P_{S0_3_x′})+V_{S_4_x′}×(P_{Smax_4_x′}-P_{S0_4_x′}), non-faulting pole sandwich circuit maximum turn band Power is Δ P '_∑maxL, wherein Δ P '_∑maxL=V_{L_1_x′}×(P_Lmax-P_{L0_1_x′})+V_{L_2_x′}×(P_Lmax-P_{L0_2_x′}), system can turn Band power is Δ P_trans, wherein Δ P_trans=min { Δ P '_{S_i_max}, Δ P '_∑maxM, Δ P '_∑maxLAnd failure measure amount be Ptrip。

10. system according to claim 6, described to calculate failure measure measurer body according to calculating data and calculating variable Include:

If route L_iFailure, then its V_{L_i_x}Become 0 from 1；

Remember route in destiny K=V_{L_1_x}+V_{L_2_x}+V_{L_3_x}+V_{L_4_x}；

As K=3；

Work as V_{L_1_x}+V_{L_2_x}=1 and P_{L0_1_P}+P_{L0_2_P}> P_Lmax, then failure measure amount P_trip=P_{L0_1_P}+P_{L0_2_P}-P_Lmax-Δ P_trans；

As K=2；

Work as V_{L_1_x}+V_{L_2_x}When=0, V_{S_1_x}+V_{S_2_x}=2 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip= P_{S0_1_x}+P_{S0_2_x}-ΔP_trans；

Work as V_{L_3_x}+V_{L_4_x}When=0,

V_{S_1_x}+V_{S_3_x}=1, V_{S_1_x}=1 and P_{S0_1_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}-ΔP_trans,

V_{S_2_x}+V_{S_4_x}=1, V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount

Work as V_{L_1_x}+V_{L_4_x}When=0,

V_{S_4_x}=0, P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans；

V_{S_4_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_4_x}, Δ P > 0 and Δ P_trans≤ Δ P then converter station S₁Failure measure amountConverter station S₂Failure measure amount

Work as V_{L_1_x}+V_{L_3_x}When=0,

V_{S_1_x}=1 and P_{S0_1_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_3_x}When=0,

V_{S_2_x}=1 and P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_2_x}-ΔP_trans；

Work as V_{L_2_x}+V_{L_4_x}When=0,

V_{S_3_x}=0 and P_{S0_1_x}+P_{S0_2_x}> Δ P_transThen failure measure amount P_trip=P_{S0_1_x}+P_{S0_2_x}-ΔP_trans

V_{S_3_x}=1, Δ P=P_{S0_1_x}+P_{S0_2_x}-P_{Smax_3_x}, Δ P > 0 and Δ P_trans≤ Δ P then converter station S₁Failure measure amountConverter station S₂Failure measure amount