CN102624035B - Alternative current and direct current coordination control method based on direct current power emergency control - Google Patents

Abstract

The invention belongs to the field of alternative current and direct current electricity transmission system operation control, in particular to an alternative current and direct current coordination control method based on direct current power emergency control, which comprises alternative current and direct current coordination control based on a priority allocation principle, alternative current and direct current coordination control based on an even allocation principle or alternative current and direct current coordination control based on an equal power loading rate principle. The alternative current and direct current coordination control method based on direct current power emergency control is applied to an direct current and alternative current system or a multi-direct-current system with a complex net frame structure and has the advantages of being strong in achieving method operability and wide in application range.

Description

A kind of control method for coordinating of alternating current-direct current based on the direct current power emergency control

Technical field

The invention belongs to AC/DC Power System operation control field, specifically relate to a kind of control method for coordinating of alternating current-direct current based on the direct current power emergency control.

Background technology

Direct current system has fast controlled ability of power,, according to the stability analysis result, by event or certain signal, is triggered, and changes rapidly the transmitted power of direct current system according to Policy Table or prediction scheme, comprises that urgent direct current power promotes or returns and fall.In implementation process, the power emergency lifting, need to consider limiting with lasting capability of overload in short-term of direct current system; Power promptly returns and falls, and needs to consider the restriction of the minimum operate power of direct current system.In Practical Project, usually can run into the situation of direct current power emergency lifting.

The domestic and international project application example shows, utilize the direct current power emergency control can effectively improve the power system safety and stability level, but the existing alternating current-direct current coordination control of direct current power emergency control realization or the many direct currents of utilizing coordinated to be controlled in implementation process to lack clear and definite power allocation scheme, has to be solved.

Existing about alternating current-direct current, coordinate to control and many direct currents are coordinated the method for controlling, exist lose contact with reality demand, control method of control target to be difficult to the drawbacks such as engineering application.

Summary of the invention

For the deficiencies in the prior art, the invention provides a kind of control method for coordinating of alternating current-direct current based on the direct current power emergency control, the method is applicable to ac and dc systems or many direct current systems of grid structure complexity, has implementation method strong operability, characteristics applied widely.

A kind of control method for coordinating of alternating current-direct current based on the direct current power emergency control, its improvements be, described method comprises:

(1) alternating current-direct current of Priority-based distribution principle is coordinated to control;

(2) coordinate to control based on the alternating current-direct current of uniform distribution principle; Or

(3) coordinate to control based on the alternating current-direct current of power termination rate equal principle.

A kind of preferred technical scheme provided by the invention is: in described (1), make P={P (1) ..., P (i) ..., P (n) } be the initial transmitted power of direct current system; Δ P={ Δ P (1) ..., Δ P (i) ..., Δ P (n) } for distributing to the actual power controlled quentity controlled variable of direct current system; P '=P ' (1) ..., and P ' (i) ..., P ' is (n) } for distributing the actual transmitted power of direct current system after the power controlled quentity controlled variable; P _max={ P _max(1) ..., P _max(i) ..., P _max(n) } be the maximum transmitted power of direct current system; Δ P _Order={ Δ P _Order(1) ..., Δ P _Order(i) ..., Δ P _Order(n) } for power controlled quentity controlled variable to be allocated is arranged; N is for participating in the direct current system number of power division; Δ P _∑Gross power controlled quentity controlled variable for system requirements; The direct current system of described Priority-based distribution principle is coordinated to control according to priority and is successively carried out power division from height to low order, until power all assigns or distributed power for all direct current systems.

A kind of more preferably technical scheme provided by the invention is: the direct current system of the sequence the 1st of described priority is carried out power division comprise: order

P′(1)＝P(1)+ΔP(1) ①；

ΔP _order(1)＝ΔP _∑ ②；

If P (1)+Δ P _Order(1)≤P _max(1), have: Δ P (1)=Δ P _Order(1) 3., power division finishes;

If P (1)+Δ P _Order(1)＞P _max(1), have: $\left\{\begin{array}{c}\mathrm{\ΔP}\left(1\right)=P_{\max }\left(1\right)-P\left(1\right)\\ {\mathrm{\ΔP}}_{\mathrm{order}}\left(2\right)={\mathrm{\ΔP}}_{\mathrm{order}}\left(1\right)-\mathrm{\ΔP}\left(1\right)\end{array}\right.$ 4., continue the direct current system of to priority, taking second place and distribute power.

Provided by the invention another more preferably technical scheme be: the direct current system of the sequence i of described priority is carried out power division comprises: order

P′(i)＝P(i)+ΔP(i) ⑤；

If P (i)+Δ P _Order(i)≤P _max(i), have: Δ P (i)=Δ P _Order(i) 6., power division finishes;

If P (i)+Δ P _Order(i)＞P _max(i), have: $\left\{\begin{array}{c}\mathrm{\ΔP}\left(i\right)=P_{\max }\left(i\right)-P\left(i\right)\\ {\mathrm{\ΔP}}_{\mathrm{order}}(i+1)={\mathrm{\ΔP}}_{\mathrm{order}}\left(i\right)-\mathrm{\ΔP}\left(i\right)\end{array}\right.$ 7., continue the direct current system of to priority, taking second place and distribute power, until power all assigns or distributed power for all direct current systems;

If distributed power for all direct current systems, still have power unallocated complete, the gross power controlled quentity controlled variable Δ P of system requirements _∑Surpass the power controlled quentity controlled variable summation that all direct current systems can be born, remainder power can't be redistributed to arbitrary direct current system.

The provided by the invention second preferred technical scheme is: in described (2), make P={P (1) ..., P (i) ..., P (n) } be the initial transmitted power of direct current system; Δ P={ Δ P (1) ..., Δ P (i) ..., Δ P (n) } for distributing to the actual power controlled quentity controlled variable of direct current system; P '=P ' (1) ..., and P ' (i) ..., P ' is (n) } for distributing the actual transmitted power of direct current system after the power controlled quentity controlled variable; P _max={ P _max(1) ..., P _max(i) ..., P _max(n) } be the maximum transmitted power of direct current system; N is for participating in the direct current system number of power division; The direct current system number of m for having weeded out; Δ P _∑Gross power controlled quentity controlled variable for system requirements; Δ P ' _∑The power controlled quentity controlled variable sum that is assigned to for the direct current system that has weeded out; The alternating current-direct current of described uniform distribution principle is coordinated to control and is comprised the steps:

A, judge whether direct current system meets the requirement of uniform distribution principle;

B, filter out the direct current system of restriction uniform distribution principle, and the direct current system of restriction uniform distribution principle is distributed power;

C, rejecting have distributed the direct current system of power, and the residue direct current system is returned to steps A.

A kind of more preferably technical scheme provided by the invention is: in described steps A, the calculating formula that meets the uniform distribution principle is as follows:

If $\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}-{\mathrm{\ΔP}}_{\mathrm{\Σ}}^{\′}}{n-m}\≤\min \{P_{\max }\left(1\right)-P\left(1\right),\·\·\·,P_{\max }\left(i\right)-P\left(i\right),\·\·\·,P_{\max }\left(n\right)-P\left(n\right)\}$ ⑧；

Have: $\left\{\begin{array}{c}{P}^{\′}\left(1\right)=P\left(1\right)+\mathrm{\ΔP}\left(1\right)\\ .\\ .\\ .\\ P^{\′}\left(i\right)=P\left(i\right)+\mathrm{\ΔP}\left(i\right)\\ .\\ .\\ .\\ P^{\′}\left(n\right)=P\left(n\right)+\mathrm{\ΔP}\left(n\right)\end{array}\right.$ ⑨；

Formula 8. in, Δ P _∑The gross power controlled quentity controlled variable of system requirements, min is for getting minimum value function, formula 9. in, $\mathrm{\ΔP}\left(1\right)=\mathrm{\ΔP}\left(i\right)=\·\·\·=\mathrm{\ΔP}\left(n\right)=\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}-{\mathrm{\ΔP}}_{\mathrm{\Σ}}^{\′}}{n-m}.$

Provided by the invention again one more preferably technical scheme be: in described step B, the direct current system of restriction uniform distribution principle is the direct current system that does not meet the uniform distribution principle of steps A, and computing formula is as follows:

If $\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}-{\mathrm{\ΔP}}_{\mathrm{\Σ}}^{\′}}{n-m}>\min \{P_{\max }\left(1\right)-P\left(1\right),\·\·\·,P_{\max }\left(i\right)-P\left(i\right),\·\·\·,P_{\max }\left(n\right)-P\left(n\right)\}$ ⑩；

:

Make Δ P _min(j)=min{P _max(1)-P (1) ..., P _max(i)-P (i) ..., P _max(n)-P (n) }, Δ P _min(j) be set { P _max(1)-P (1) ..., P _max(i)-P (i) ..., P _max(n)-P (n) } in minimum value, and j is that j corresponding to minimum value returns direct current system;

The j that filters out is returned direct current distributes power, that is: P ' (j)=P (j)+Δ P _min(j).

Provided by the invention also one more preferably technical scheme be: in described step C, need the gross power controlled quentity controlled variable of distributing need reject the described Δ P that has distributed of step B next time _min(j) part, be about to j and return the power Δ P that direct current is assigned to _min(j) count Δ P ' _∑, upgrade the direct current system number m that has weeded out, until power all assigns or distributed power for all direct current systems.

The provided by the invention the 3rd preferred technical scheme is: in described (3), the master control power that makes system requirements is Δ P _∑P={P (1) ..., P (i) ..., P (n) } be the initial transmitted power of each direct current system; Δ P={ Δ P (1) ..., Δ P (i) ..., Δ P (n) } for distributing to the actual power controlled quentity controlled variable of each direct current system; P '=P ' (1) ..., and P ' (i) ..., P ' is (n) } for distributing the actual transmitted power of each direct current system after the power controlled quentity controlled variable; P _max={ P _max(1) ..., P _max(i) ..., P _max(n) } be the maximum transmitted power of each direct current system; N is for participating in the direct current system number of power division; Δ P _∑Gross power controlled quentity controlled variable for system requirements; Described alternating current-direct current based on power termination rate equal principle is coordinated to control and is comprised:

If ${\mathrm{\ΔP}}_{\mathrm{\Σ}}\≤\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\max }\left(i\right)-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)$

Have:

$\mathrm{\ϵ}=\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\max }\left(i\right)}$

Formula

In, ε is direct current system transmitted power load factor, with respect to the maximum transmitted power of direct current system, the ε span is in [0,1] interval; Have:

$\left\{\begin{array}{c}{P}^{\′}\left(1\right)=P\left(1\right)+\mathrm{\ΔP}\left(1\right)\\ .\\ .\\ .\\ P^{\′}\left(i\right)=P\left(i\right)+\mathrm{\ΔP}\left(i\right)\\ .\\ .\\ .\\ P^{\′}\left(n\right)=P\left(n\right)+\mathrm{\ΔP}\left(n\right)\end{array}\right.$ And

$\left\{\begin{array}{c}\mathrm{\ΔP}\left(1\right)={\mathrm{\ϵP}}_{\max }\left(1\right)-P\left(1\right)\\ .\\ .\\ .\\ \mathrm{\ΔP}\left(i\right)={\mathrm{\ϵP}}_{\max }\left(i\right)-P\left(i\right)\\ .\\ .\\ .\\ \mathrm{\ΔP}\left(n\right)={\mathrm{\ϵP}}_{\max }\left(n\right)-P\left(n\right)\end{array}\right.$

Power division finishes;

If ${\mathrm{\ΔP}}_{\mathrm{\Σ}}>\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\max }\left(i\right)-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)$

Have:

$\left\{\begin{array}{c}{P}^{\′}\left(1\right)=P\left(1\right)+\mathrm{\ΔP}\left(1\right)\\ .\\ .\\ .\\ P^{\′}\left(i\right)=P\left(i\right)+\mathrm{\ΔP}\left(i\right)\\ .\\ .\\ .\\ P^{\′}\left(n\right)=P\left(n\right)+\mathrm{\ΔP}\left(n\right)\end{array}\right.$

And $\left\{\begin{array}{c}\mathrm{\ΔP}\left(1\right)=P_{\max }\left(1\right)-P\left(1\right)\\ .\\ .\\ .\\ \mathrm{\ΔP}\left(i\right)=P_{\max }\left(i\right)-P\left(i\right)\\ .\\ .\\ .\\ \mathrm{\ΔP}\left(n\right)=P_{\max }\left(n\right)-P\left(n\right)\end{array}\right.$

Show to all direct current systems and distributed power, and individual direct current transportation power reaches maximum, remain unappropriated power and can't be redistributed to arbitrary direct current system.

The provided by the invention the 4th preferred technical scheme is: described method is applicable to contain the ac and dc systems coordination control of many times direct currents or the coordination between many direct current systems is controlled.

Compared with the prior art, beneficial effect of the present invention is:

1, it is convenient that the control method for coordinating of the alternating current-direct current based on the direct current power emergency control provided by the invention has practical application, namely applicable to the coordination of ac and dc systems or many direct current systems, controls, and also applicable to the coordination between many times direct current systems, controls;

2, three kinds of control programs provided by the invention are selected according to the actual requirements, or application capable of being combined, and flexibility is strong.

Description of drawings

Fig. 1 is three kinds of scheme schematic diagrames of the control method for coordinating of the alternating current-direct current based on the direct current power emergency control of the embodiment of the present invention;

Fig. 2 is the flow chart of alternating current-direct current Coordinated Control Scheme of the Priority-based distribution principle of the embodiment of the present invention;

Fig. 3 is the flow chart of the Coordinated Control Scheme of the alternating current-direct current based on the uniform distribution principle of the embodiment of the present invention;

Fig. 4 is the flow chart of the alternating current-direct current Coordinated Control Scheme based on power termination rate equal principle of the embodiment of the present invention;

Fig. 5 is the direct current transportation power effect schematic diagram of the embodiment of the present invention;

Fig. 6 is the controlled ac bus power fluctuation effect schematic diagram of the embodiment of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

A kind of control method for coordinating of alternating current-direct current based on the direct current power emergency control provided by the invention, utilize the ability of direct current rapid adjustment transmitted power, according to system condition and demand for control,, by one of three kinds of power division Coordinated Control Schemes of the present invention, realize that the coordination of alternating current-direct current or many direct currents is controlled.

As shown in Figure 1, Fig. 1 is three kinds of scheme schematic diagrames of the control method for coordinating of the alternating current-direct current based on the direct current power emergency control of the embodiment of the present invention; Power division control method for coordinating provided by the invention comprises:

(1) the direct current system Coordinated Control Scheme of Priority-based distribution principle;

(2) based on the direct current system Coordinated Control Scheme of uniform distribution principle;

(3) based on the direct current system Coordinated Control Scheme of power termination rate equal principle.

Below three kinds of power division Coordinated Control Schemes are described in detail:

(1) the alternating current-direct current Coordinated Control Scheme of Priority-based distribution principle:

As shown in Figure 2, Fig. 2 is the flow chart of direct current system Coordinated Control Scheme of the Priority-based distribution principle of the embodiment of the present invention; Participate in for each direct current system priority of controlling according to the principle of determining, according to the master control power Δ P of system requirements _∑Successively distribute power controlled quentity controlled variable from height to low sequencing for each direct current system according to priority, namely at first with power division to the highest direct current system of priority, if reaching the upper limit, this direct current system transmitted power still has the residue power ratio control, the direct current system of more remaining power control allocation being taken second place to priority, the rest may be inferred, until complete the master control power division or reach all direct current system transmitted power higher limits, can't distribute again.Specifically describe as follows:

If, P={P (1) ..., P (i) ..., P (n) } be the initial transmitted power of each direct current system, n is for participating in the direct current system number of power division; Δ P={ Δ P (1) ..., Δ P (i) ..., Δ P (n) } for distributing to the actual power controlled quentity controlled variable of each direct current system; P '=P ' (1) ..., and P ' (i) ..., P ' is (n) } for distributing the actual transmitted power of each direct current system after the power controlled quentity controlled variable; P _max={ P _max(1) ..., P _max(i) ..., P _max(n) } be the maximum transmitted power of each direct current system; Δ P _Order={ Δ P _Order(1) ..., Δ P _Order(i) ..., Δ P _Order(n) } for power controlled quentity controlled variable to be allocated is arranged at every turn.

Carry out power division as the direct current system to prioritization the 1st, order:

P′(1)＝P(1)+ΔP(1) ①；

ΔP _order(1)＝ΔP _∑ ②；

Situation 1: if P (1)+Δ P _Order(1)≤P _max(1), have: Δ P (1)=Δ P _Order(1) 3., distribute power to finish.

Situation 2: if P (1)+Δ P _Order(1)＞P _max(1), have: $\left\{\begin{array}{c}\mathrm{\ΔP}\left(1\right)=P_{\max }\left(1\right)-P\left(1\right)\\ {\mathrm{\ΔP}}_{\mathrm{order}}\left(2\right)={\mathrm{\ΔP}}_{\mathrm{order}}\left(1\right)-\mathrm{\ΔP}\left(1\right)\end{array}\right.$ ④。

Carry out power division as the direct current system to prioritization the 2nd, order:

P′(2)＝P(2)+ΔP(2)

Situation 1: if P (2)+Δ P _Order(2)≤P _max(2) Δ P (2)=Δ P, is arranged _Order(2) distribute power to finish.

Situation 2: if P (2)+Δ P _Order(2)＞P _max(2), have, $\left\{\begin{array}{c}\mathrm{\ΔP}\left(2\right)=P_{\max }\left(2\right)-P\left(2\right)\\ {\mathrm{\ΔP}}_{\mathrm{order}}\left(3\right)={\mathrm{\ΔP}}_{\mathrm{order}}\left(2\right)-\mathrm{\ΔP}\left(2\right)\end{array}\right.$

To sum up, according to priority, from height to low order, successively carry out power division, the like, until power all assigns or distributed power, order for all direct current systems:

P′(i)＝P(i)+ΔP(i) ⑤；

Situation 1: if P (i)+Δ P _Order(i)≤P _max(i), have: Δ P (i)=Δ P _Order(i) 6., distribute power to finish.

Situation 2: if P (i)+Δ P _Order(i)＞P _max(i), have: $\left\{\begin{array}{c}\mathrm{\ΔP}\left(i\right)=P_{\max }\left(i\right)-P\left(i\right)\\ {\mathrm{\ΔP}}_{\mathrm{order}}(i+1)={\mathrm{\ΔP}}_{\mathrm{order}}\left(i\right)-\mathrm{\ΔP}\left(i\right)\end{array}\right.$ ⑦。

If distributed power for all direct current systems, still dump power is unallocated complete, and Δ P is described _∑Surpassed all direct current systems and can bear the total amount that power changes, remainder power can't be redistributed to arbitrary direct current system.

(2) based on the alternating current-direct current Coordinated Control Scheme of uniform distribution principle:

As shown in Figure 3, Fig. 3 is the flow chart of the Coordinated Control Scheme of the direct current system based on the uniform distribution principle of the embodiment of the present invention; Guaranteeing that arbitrary direct current transportation power does not exceed under the condition of limit value, with the master control power Δ P of system requirements _∑Mean allocation, to each direct current system, considers that still some transmission line reaches the Power Limitation value before and after power shortage distributes, and actual power shortage is mean allocation not necessarily.Specifically describe as follows:

Make P={P (1) ..., P (i) ..., P (n) } be the initial transmitted power of each direct current system, n is for participating in the direct current system number of power division; Δ P={ Δ P (1) ..., Δ P (i) ..., Δ P (n) } for distributing to the actual power controlled quentity controlled variable of each direct current system; P '=P ' (1) ..., and P ' (i) ..., P ' is (n) } for distributing the actual transmitted power of each direct current system after the power controlled quentity controlled variable; P _max={ P _max(1) ..., P _max(i) ..., P _max(n) } be the maximum transmitted power of each direct current system.

Steps A: judge whether each direct current system meets the requirement of uniform distribution principle:

If $\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}-{\mathrm{\ΔP}}_{\mathrm{\Σ}}^{\′}}{n-m}\≤\min \{P_{\max }\left(1\right)-P\left(1\right),\·\·\·,P_{\max }\left(i\right)-P\left(i\right),\·\·\·,P_{\max }\left(n\right)-P\left(n\right)\}$ ⑧，

Formula 8. middle min, for getting minimum value function, has:

$\left\{\begin{array}{c}{P}^{\′}\left(1\right)=P\left(1\right)+\mathrm{\ΔP}\left(1\right)\\ .\\ .\\ .\\ P^{\′}\left(i\right)=P\left(i\right)+\mathrm{\ΔP}\left(i\right)\\ .\\ .\\ .\\ P^{\′}\left(n\right)=P\left(n\right)+\mathrm{\ΔP}\left(n\right)\end{array}\right.$ ⑨；

Formula 9. in, $\mathrm{\ΔP}\left(1\right)=\mathrm{\ΔP}\left(i\right)=\·\·\·=\mathrm{\ΔP}\left(n\right)=\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}-{\mathrm{\ΔP}}_{\mathrm{\Σ}}^{\′}}{n-m},$ Distribute power to finish.

Step B: filter out the direct current system of restriction uniform distribution, described direct current system is distributed power.

If $\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}-{\mathrm{\ΔP}}_{\mathrm{\Σ}}^{\′}}{n-m}>\min \{P_{\max }\left(1\right)-P\left(1\right),\·\·\·,P_{\max }\left(i\right)-P\left(i\right),\·\·\·,P_{\max }\left(n\right)-P\left(n\right)\}$ ⑩，

Have:

Make Δ P _min(j)=min{P _max(1)-P (1) ..., P _max(i)-P (i) ..., P _max(n)-P (n) }, Δ P _min(j) be set { P _max(1)-P (1) ..., P _max(i)-P (i) ..., P _max(n)-P (n) } in minimum value, and j is that j corresponding to minimum value returns direct current system.

Return direct current first for the j filter out and distribute power, namely have: P ' (j)=P (j)+Δ P _min(j).

Step C: weed out the direct current system that distributes power, direct current system re-starts step 1 and step 2 is described judges whether direct current system meets the uniform distribution principle to remaining, and distributes power.

Need the power master control amount of distributing to need the described Δ P that has distributed of deduction step C _min(j) part; The like, until power all assigns or distributed power for all direct current systems.

If distributed power for all direct current systems, still have power unallocated complete, Δ P is described _∑Surpassed all direct current systems and can bear the total amount that power changes, remainder power can't be redistributed to arbitrary direct current system.

(3) based on the alternating current-direct current Coordinated Control Scheme of power termination rate equal principle:

As shown in Figure 4, Fig. 4 is the flow chart of the direct current system Coordinated Control Scheme based on power termination rate equal principle of the embodiment of the present invention; Power termination rate equal principle, after namely distributing power shortage, guarantee on the DC line of every normal operation, the power termination rate equates, make the utilance of conveying capacity of each DC transmission system roughly suitable, avoid occurring some circuit at full capacity, and some line power conveying capacity still has remaining phenomenon.Specifically describe as follows:

The master control power that makes system requirements is Δ P _∑P={P (1) ..., P (i) ..., P (n) } be the initial transmitted power of each direct current system, n is for participating in the direct current system number of power division; Δ P={ Δ P (1) ..., Δ P (i) ..., Δ P (n) } for distributing to the actual power controlled quentity controlled variable of each direct current system; P '=P ' (1) ..., and P ' (i) ..., P ' is (n) } for distributing the actual transmitted power of each direct current system after the power controlled quentity controlled variable; P _max={ P _max(1) ..., P _max(i) ..., P _max(n) } be the maximum transmitted power of each direct current system.

If ${\mathrm{\ΔP}}_{\mathrm{\Σ}}\≤\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\max }\left(i\right)-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)$

Have: $\mathrm{\ϵ}=\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\max }\left(i\right)}$

Formula

In, ε is direct current system transmitted power load factor, with respect to the maximum transmitted power of direct current system, the ε span, in [0,1] interval, therefore has:

$\left\{\begin{array}{c}{P}^{\′}\left(1\right)=P\left(1\right)+\mathrm{\ΔP}\left(1\right)\\ .\\ .\\ .\\ P^{\′}\left(i\right)=P\left(i\right)+\mathrm{\ΔP}\left(i\right)\\ .\\ .\\ .\\ P^{\′}\left(n\right)=P\left(n\right)+\mathrm{\ΔP}\left(n\right)\end{array}\right.$ And $\left\{\begin{array}{c}\mathrm{\ΔP}\left(1\right)={\mathrm{\ϵP}}_{\max }\left(1\right)-P\left(1\right)\\ .\\ .\\ .\\ \mathrm{\ΔP}\left(i\right)={\mathrm{\ϵP}}_{\max }\left(i\right)-P\left(i\right)\\ .\\ .\\ .\\ \mathrm{\ΔP}\left(n\right)={\mathrm{\ϵP}}_{\max }\left(n\right)-P\left(n\right)\end{array}\right.$ Distribute power to finish.

If ${\mathrm{\ΔP}}_{\mathrm{\Σ}}>\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\max }\left(i\right)-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)$

Have:

$\left\{\begin{array}{c}{P}^{\′}\left(1\right)=P\left(1\right)+\mathrm{\ΔP}\left(1\right)\\ .\\ .\\ .\\ P^{\′}\left(i\right)=P\left(i\right)+\mathrm{\ΔP}\left(i\right)\\ .\\ .\\ .\\ P^{\′}\left(n\right)=P\left(n\right)+\mathrm{\ΔP}\left(n\right)\end{array}\right.$

And $\left\{\begin{array}{c}\mathrm{\ΔP}\left(1\right)=P_{\max }\left(1\right)-P\left(1\right)\\ .\\ .\\ .\\ \mathrm{\ΔP}\left(i\right)=P_{\max }\left(i\right)-P\left(i\right)\\ .\\ .\\ .\\ \mathrm{\ΔP}\left(n\right)=P_{\max }\left(n\right)-P\left(n\right)\end{array}\right.$

Show to all direct current systems and distributed power, and each direct current transportation power reaches maximum, remain unappropriated power and can't be redistributed to arbitrary direct current system.

Below in conjunction with specific embodiment, the present invention is described in further detail.

Embodiment

Send system outside as object take China's Chongqing of Sichuan electrical network southwest water power alternating current-direct current, can reduce the quantity of sending excision generator to adding dam～Shanghai extra-high voltage direct-current system, silk screen～Suzhou extra-high voltage direct-current system and Deyang～Baoji high-voltage direct current employing direct current power emergency control, reach the effect of electrical network second defence line control measure.In example, the transmission line of alternation current catastrophic failure that is state in parallel with direct current system disconnects, its transmitted power of initially bearing need to utilize the urgent control function of power of above-mentioned three times direct current systems, is dispensed to each direct current system, improves the stability of a system after the fault of alternating current circuit.Example adopts the alternating current-direct current Coordinated Control Scheme based on power termination rate equal principle, control effect as shown in Figure 5 and Figure 6, wherein Fig. 5 is for being dispensed to power ratio control three times actual transmitted powers of direct current system after Xiang Jiaba～Shanghai extra-high voltage direct-current system, silk screen～Suzhou extra-high voltage direct-current system and Deyang～Baoji high-voltage direct current, its load factor is 1, namely reaches maximum constraints; Fig. 6 is Great Gulch～slab bridge transmission line of alternation current and Huangyan～transmission line of alternation current, Wan County transmitted power fluctuation schematic diagram, this figure shows that employing can obviously improve the stability of system based on the alternating current-direct current Coordinated Control Scheme of power termination rate equal principle, the AC system power fluctuation can be calmed down in the shorter time, system damping is stronger, has reached alternating current-direct current and has coordinated the target of controlling.

Control method for coordinating provided by the invention also can use and the system of alternating current-direct current or many direct currents in.Three kinds of power division principles provided by the invention can be used separately, and also co-design is used as required.When actual design direct current power Emergency Assistance strategy, not only to consider from the part of direct current system own, also to consider from the angle of whole AC and DC system comprehensively.Say from AC system, consider the problems such as trend distribution, system stability and power-balance of AC system.In a word, various schemes should be put under whole AC and DC system condition, check under the various operational mode of system relatively, thereby determine optimal case.

Should be noted that finally: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment, the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.

Claims (9)

1. the control method for coordinating of the alternating current-direct current based on the direct current power emergency control, is characterized in that, described method comprises:

(1) alternating current-direct current of Priority-based distribution principle is coordinated to control;

(2) coordinate to control based on the alternating current-direct current of uniform distribution principle; Or

(3) coordinate to control based on the alternating current-direct current of power termination rate equal principle;

In described (1), make P={P (1) ..., P (i) ..., P (n) } and be the initial transmitted power of direct current system; Δ P={ Δ P (1) ..., Δ P (i) ..., Δ P (n) } and for distributing to the actual power controlled quentity controlled variable of direct current system; P '=P ' (1) ..., P ' (i) ..., P ' is (n) } and for distributing the actual transmitted power of direct current system after the power controlled quentity controlled variable; P _max={ P _max(1) ..., P _max(i) ..., P _max(n) } be the maximum transmitted power of direct current system; Δ P _Order={ Δ P _Order(1) ..., Δ P _Order(i) ..., Δ P _Order(n) } for power controlled quentity controlled variable to be allocated is arranged; N is for participating in the direct current system number of power division; Δ P _∑Gross power controlled quentity controlled variable for system requirements; The direct current system of described Priority-based distribution principle is coordinated to control according to priority and is successively carried out power division from height to low order, until power all assigns or distributed power for all direct current systems.

2. alternating current-direct current control method for coordinating as claimed in claim 1, is characterized in that, the direct current system of the sequence the 1st of described priority carried out power division comprise: order

P′(1)＝P(1)+ΔP(1) ①；

ΔP _order(1)＝ΔP _Σ ②；

If P (1)+Δ P _Order(1)≤P _max(1), have: Δ P (1)=Δ P _Order(1) 3., power division finishes;

If P (1)+Δ P _Order(1)＞P _max(1), have: $\left\{\begin{array}{c}\mathrm{\ΔP}\left(1\right)=P_{\max }\left(1\right)-P\left(1\right)\\ {\mathrm{\ΔP}}_{\mathrm{order}}\left(2\right)={\mathrm{\ΔP}}_{\mathrm{order}}\left(1\right)-\mathrm{\ΔP}\left(1\right)\end{array}\right.$ 4., continue the direct current system of to priority, taking second place and distribute power.

3. alternating current-direct current control method for coordinating as claimed in claim 1, is characterized in that, the direct current system of the sequence i of described priority carried out power division comprise: order

P′(i)＝P(i)+ΔP(i) ⑤；

If P (i)+Δ P _Order(i)≤P _max(i), have: Δ P (i)=Δ P _Order(i) 6., power division finishes;

If P (i)+Δ P _Order(i)＞P _max(i), have: $\left\{\begin{array}{c}\mathrm{\ΔP}\left(i\right)=P_{\max }\left(i\right)-P\left(i\right)\\ {\mathrm{\ΔP}}_{\mathrm{order}}(i+1)={\mathrm{\ΔP}}_{\mathrm{order}}\left(i\right)-\mathrm{\ΔP}\left(i\right)\end{array}\right.$ 7., continue the direct current system of to priority, taking second place and distribute power, until power all assigns or distributed power for all direct current systems;

If distributed power for all direct current systems, still have power unallocated complete, the gross power controlled quentity controlled variable Δ P of system requirements _∑Surpass the power controlled quentity controlled variable summation that all direct current systems can be born, remainder power can't be redistributed to arbitrary direct current system.

4. alternating current-direct current control method for coordinating as claimed in claim 1, is characterized in that, in described (2), makes P={P (1) ..., P (i) ..., P (n) } and be the initial transmitted power of direct current system; Δ P={ Δ P (1) ..., Δ P (i) ..., Δ P (n) } and for distributing to the actual power controlled quentity controlled variable of direct current system; P '=P ' (1) ..., P ' (i) ..., P ' is (n) } and for distributing the actual transmitted power of direct current system after the power controlled quentity controlled variable; P _max={ P _max(1) ..., P _max(i) ..., P _max(n) } be the maximum transmitted power of direct current system; N is for participating in the direct current system number of power division; The direct current system number of m for having weeded out; Δ P _∑Gross power controlled quentity controlled variable for system requirements; Δ P _Σ' power controlled quentity controlled variable the sum that is assigned to for the direct current system that weeded out; The alternating current-direct current of described uniform distribution principle is coordinated to control and is comprised the steps:

A, judge whether direct current system meets the requirement of uniform distribution principle;

B, filter out the direct current system of restriction uniform distribution principle, and the direct current system of restriction uniform distribution principle is distributed power;

C, rejecting have distributed the direct current system of power, and the residue direct current system is returned to steps A.

5. alternating current-direct current control method for coordinating as claimed in claim 4, is characterized in that, in described steps A, the calculating formula that meets the uniform distribution principle is as follows:

If $\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}-\mathrm{\Δ}{P}_{\mathrm{\Σ}}^{\′}}{n-m}\≤\min \{P_{\max }\left(1\right)-P\left(1\right),\mathrm{\Λ},P_{\max }\left(i\right)-P\left(i\right),\mathrm{\Λ},P_{\max }\left(n\right)-P\left(n\right)\}$ ⑧；

Have: $\left\{\begin{array}{c}{P}^{\′}\left(1\right)=P\left(1\right)+\mathrm{\ΔP}\left(1\right)\\ M\\ P^{\′}\left(i\right)=P\left(i\right)+\mathrm{\ΔP}\left(i\right)\\ M\\ P^{\′}\left(n\right)=P\left(n\right)+\mathrm{\ΔP}\left(n\right)\end{array}\right.$ ⑨；

Formula 8. in, Δ P _ΣThe gross power controlled quentity controlled variable of system requirements, min is for getting minimum value function, formula 9. in, $\mathrm{\ΔP}\left(1\right)=\mathrm{\ΔP}\left(i\right)=\mathrm{\Λ}=\mathrm{\ΔP}\left(n\right)=\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}-{\mathrm{\ΔP}}_{\mathrm{\Σ}}^{\′}}{n-m}.$

6. alternating current-direct current control method for coordinating as claimed in claim 4, is characterized in that, in described step B, the direct current system of restriction uniform distribution principle is the direct current system that does not meet the uniform distribution principle of steps A, and computing formula is as follows:

If $\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}-{\mathrm{\ΔP}}_{\mathrm{\Σ}}^{\′}}{n-m}>\min \{P_{\max }\left(1\right)-P\left(1\right),\mathrm{\Λ},P_{\max }\left(i\right)-P\left(i\right),\mathrm{\Λ},P_{\max }\left(n\right)-P\left(n\right)\}$ ⑩；

:

Make Δ P _min(j)=min{P _max(1)-P (1), L, P _max(i)-P (i), L, P _max(n)-P (n) }, Δ P _min(j) be set { P _max(1)-P (1) ..., P _max(i)-P (i) ..., P _max(n)-P (n) } in minimum value, and j is that j corresponding to minimum value returns direct current system;

The j that filters out is returned direct current distributes power, that is: P ' (j)=P (j)+Δ P _min(j).

7. alternating current-direct current control method for coordinating as claimed in claim 4, is characterized in that, in described step C, needs the gross power controlled quentity controlled variable of distributing need reject the described Δ P that has distributed of step B next time _min(j) part, be about to j and return the power Δ P that direct current is assigned to _min(j) count Δ P _Σ', upgrade the direct current system number m that has weeded out, until power all assigns or distributed power for all direct current systems.

8. alternating current-direct current control method for coordinating as claimed in claim 1, is characterized in that, in described (3), the master control power that makes system requirements is Δ P _∑P={P (1) ..., P (i) ..., P (n) } and be the initial transmitted power of each direct current system; Δ P={ Δ P (1) ..., Δ P (i) ..., Δ P (n) } and for distributing to the actual power controlled quentity controlled variable of each direct current system; P '=P ' (1) ..., P ' (i) ..., P ' is (n) } and for distributing the actual transmitted power of each direct current system after the power controlled quentity controlled variable; P _max={ P _max(1) ..., P _max(i) ..., P _max(n) } be the maximum transmitted power of each direct current system; N is for participating in the direct current system number of power division; Δ P _∑Gross power controlled quentity controlled variable for system requirements; Described alternating current-direct current based on power termination rate equal principle is coordinated to control and is comprised:

If ${\mathrm{\ΔP}}_{\mathrm{\Σ}}\≤\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\max }\left(i\right)-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)$

；

Have:

$\mathrm{\ϵ}=\frac{{\mathrm{\ΔP}}_{\mathrm{\Σ}}+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\max }\left(i\right)}$

Formula

In, ε is direct current system transmitted power load factor, with respect to the maximum transmitted power of direct current system, the ε span is in [0,1] interval; Have:

$\left\{\begin{array}{c}{P}^{\′}\left(1\right)=P\left(1\right)+\mathrm{\ΔP}\left(1\right)\\ M\\ P^{\′}\left(i\right)=P\left(i\right)+\mathrm{\ΔP}\left(i\right)\\ M\\ P^{\′}\left(n\right)=P\left(n\right)+\mathrm{\ΔP}\left(n\right)\end{array}\right.$

And $\left\{\begin{array}{c}\mathrm{\ΔP}\left(1\right)={\mathrm{\ϵP}}_{\max }\left(1\right)-P\left(1\right)\\ M\\ \mathrm{\ΔP}\left(i\right)={\mathrm{\ϵP}}_{\max }\left(i\right)-P\left(i\right)\\ M\\ \mathrm{\ΔP}\left(n\right)={\mathrm{\ϵP}}_{\max }\left(n\right)-P\left(n\right)\end{array}\right.$

Power division finishes;

If ${\mathrm{\ΔP}}_{\mathrm{\Σ}}>\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\max }\left(i\right)-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)$

Have:

$\left\{\begin{array}{c}{P}^{\′}\left(1\right)=P\left(1\right)+\mathrm{\ΔP}\left(1\right)\\ M\\ P^{\′}\left(i\right)=P\left(i\right)+\mathrm{\ΔP}\left(i\right)\\ M\\ P^{\′}\left(n\right)=P\left(n\right)+\mathrm{\ΔP}\left(n\right)\end{array}\right.$

And $\left\{\begin{array}{c}\mathrm{\ΔP}\left(1\right)=P_{\max }\left(1\right)-P\left(1\right)\\ M\\ \mathrm{\ΔP}\left(i\right)=P_{\max }\left(i\right)-P\left(i\right)\\ M\\ \mathrm{\ΔP}\left(n\right)=P_{\max }\left(n\right)-P\left(n\right)\end{array}\right.$

Show to all direct current systems and distributed power, and each direct current transportation power reaches maximum, remain unappropriated power and can't be redistributed to arbitrary direct current system.

9. alternating current-direct current control method for coordinating as described in any one in claim 1-8, is characterized in that, described method is applicable to contain the ac and dc systems coordination control of many times direct currents or the coordination between many direct current systems is controlled.

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