CN102624035A - 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 alternating current-direct current control method for coordinating based on the direct current power emergency control

Technical field

The invention belongs to alternating current-direct current transmission system operation control field, specifically relate to a kind of alternating current-direct current control method for coordinating based on the direct current power emergency control.

Background technology

Direct current system has the ability of power fast controllable, according to the stability analysis result, by incident or certain signal triggering, changes the transmitted power of direct current system rapidly according to Policy Table or prediction scheme, comprises that urgent direct current power promotes or returns and fall.In implementation process, power promptly promotes, and needs 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 actual engineering, can run into the urgent situation about promoting of direct current power usually.

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 that utilizes the direct current power emergency control to realize coordinates control or many direct currents are coordinated to be controlled to lack clear and definite power allocation scheme in the implementation process, has to be solved.

Existing coordinate control and many direct currents about alternating current-direct current and coordinate the method controlled, exist lose contact with reality demand, control method of controlled target to be difficult to drawbacks such as practical applications.

Summary of the invention

Deficiency to prior art; The present invention provides a kind of alternating current-direct current control method for coordinating based on the direct current power emergency control; This method is applicable to ac and dc systems or the many direct current systems that grid structure is complicated, has implementation method strong operability, advantage of wide range of application.

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

(1) coordinates control based on the alternating current-direct current of priority principle;

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

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

A kind of optimized technical scheme provided by the invention is: in said (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; Said direct current system based on the priority principle is coordinated control and is carried out power division according to priority one by one from height to low order, all assigns or give all direct current systems to distribute power until power.

A kind of more preferably technical scheme provided by the invention is: the direct current system of the ordering the 1st of said 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), then has: Δ P (1)=Δ P _Order(1) 3., power division finishes;

If P (1)+Δ P _Order(1)＞P _Max(1), then have: $\left\{\begin{array}{c}\mathrm{\Δ\; P}\left(1\right)=P_{\mathrm{Max}}\left(1\right)-P\left(1\right)\\ {\mathrm{\Δ\; P}}_{\mathrm{Order}}\left(2\right)={\mathrm{\Δ\; P}}_{\mathrm{Order}}\left(1\right)-\mathrm{\Δ\; P}\left(1\right)\end{array}\right.$ 4., the direct current system that continues to take second place to priority is distributed power.

Provided by the invention another more preferably technical scheme be: the direct current system of the ordering i of said 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), then have: Δ P (i)=Δ P _Order(i) 6., power division finishes;

If P (i)+Δ P _Order(i)＞P _Max(i), then have: $\left\{\begin{array}{c}\mathrm{\Δ\; P}\left(i\right)=P_{\mathrm{Max}}\left(i\right)-P\left(i\right)\\ {\mathrm{\Δ\; P}}_{\mathrm{Order}}(i+1)={\mathrm{\Δ\; P}}_{\mathrm{Order}}\left(i\right)-\mathrm{\Δ\; P}\left(i\right)\end{array}\right.$ 7., the direct current system that continues to take second place to priority is distributed power, all assigns or give all direct current systems to distribute power until power;

If distributed power for all direct current systems, still have power unallocated intact, then 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.

Second optimized technical scheme provided by the invention is: in said (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 said uniform distribution principle is coordinated control and is comprised the steps:

A, judge whether direct current system satisfies 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 steps A.

A kind of more preferably technical scheme provided by the invention is: in the said steps A, the calculating formula that satisfies the uniform distribution principle is following:

If $\frac{{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}-{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}^{\′}}{n-m}\≤\mathrm{Min}\{P_{\mathrm{Max}}\left(1\right)-P\left(1\right),\·\·\·,P_{\mathrm{Max}}\left(i\right)-P\left(i\right),\·\·\·,P_{\mathrm{Max}}\left(n\right)-P\left(n\right)\}$ 8.;

Then have: $\left\{\begin{array}{c}{P}^{\′}\left(1\right)=P\left(1\right)+\mathrm{\Δ\; P}\left(1\right)\\ .\\ .\\ .\\ P^{\′}\left(i\right)=P\left(i\right)+\mathrm{\Δ\; P}\left(i\right)\\ .\\ .\\ .\\ P^{\′}\left(n\right)=P\left(n\right)+\mathrm{\Δ\; P}\left(n\right)\end{array}\right.$ 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, $\mathrm{\Δ\; P}\left(1\right)=\mathrm{\Δ\; P}\left(i\right)=\·\·\·=\mathrm{\Δ\; P}\left(n\right)=\frac{{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}-{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}^{\′}}{n-m}.$

Provided by the invention again one more preferably technical scheme be: among the said step B, the direct current system of restriction uniform distribution principle is the direct current system that does not satisfy the uniform distribution principle of steps A, and computing formula is following:

If $\frac{{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}-{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}^{\′}}{n-m}>\mathrm{Min}\{P_{\mathrm{Max}}\left(1\right)-P\left(1\right),\·\·\·,P_{\mathrm{Max}}\left(i\right)-P\left(i\right),\·\·\·,P_{\mathrm{Max}}\left(n\right)-P\left(n\right)\}$ 10.;

Then:

Make Δ P _Min(j)=min{P _Max(1)-P (1) ..., P _Max(i)-P (i) ..., P _Max(n)-and 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 the corresponding j of 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: among the said step C, the gross power controlled quentity controlled variable that next time need distribute need be rejected the said Δ P that has distributed of step B _Min(j) part is about to j and returns 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, all assign or give all direct current systems to distribute power until power.

The 3rd optimized technical scheme provided by the invention is: in said (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; Said alternating current-direct current based on power termination rate equal principle is coordinated control and is comprised:

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

Then have:

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

In the formula

; ε is a 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; Then have:

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

And

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

Then power division finishes;

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

Then have:

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

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

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 4th optimized technical scheme provided by the invention is: said method is applicable to that the ac and dc systems that contains many times direct currents coordinates the coordination control between control or the many direct current systems.

With the prior art ratio, beneficial effect of the present invention is:

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

2, three kinds of controlling schemes 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 sketch mapes based on the alternating current-direct current control method for coordinating of direct current power emergency control of the embodiment of the invention;

Fig. 2 be the embodiment of the invention coordinate the flow chart of controlling schemes based on the alternating current-direct current of priority principle;

Fig. 3 be the embodiment of the invention coordinate the flow chart of controlling schemes based on the alternating current-direct current of uniform distribution principle;

Fig. 4 be the embodiment of the invention coordinate the flow chart of controlling schemes based on the alternating current-direct current of power termination rate equal principle;

Fig. 5 is the direct current transportation power effect sketch map of the embodiment of the invention;

Fig. 6 is the controlled ac bus power fluctuation effect sketch map of the embodiment of the invention.

Embodiment

Be described in further detail below in conjunction with the accompanying drawing specific embodiments of the invention.

A kind of alternating current-direct current control method for coordinating provided by the invention based on the direct current power emergency control; Utilize the ability of direct current rapid adjustment transmitted power; According to system condition and demand for control; Coordinate one of controlling schemes by three kinds of power division of the present invention, realize the coordination control of alternating current-direct current or many direct currents.

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

(1) coordinates controlling schemes based on the direct current system of priority principle;

(2) coordinate controlling schemes based on the direct current system of uniform distribution principle;

(3) coordinate controlling schemes based on the direct current system of power termination rate equal principle.

Coordinating controlling schemes in the face of three kinds of power division down is described in detail:

(1) coordinate controlling schemes based on the alternating current-direct current of priority principle:

As shown in Figure 2, Fig. 2 be the embodiment of the invention coordinate the flow chart of controlling schemes based on the direct current system of priority principle; Participate in the direct current system priority of control according to the principle of confirming for each, according to the master control power Δ P of system requirements _∑One by one distribute power controlled quentity controlled variable from height to low sequencing for each direct current system according to priority; Promptly,, more remaining power controlled quentity controlled variable is dispensed to the direct current system that priority is taken second place if this direct current system transmitted power reaches the upper limit and still has the residue power controlling at first with the highest direct current system of power division to priority; The rest may be inferred, until accomplish the master control power division or reach all direct current system transmitted power higher limits can't distribute again till.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.

Direct current system as to prioritization the 1st is carried out power division, 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), then has: Δ P (1)=Δ P _Order(1) 3., distribute power to finish.

Situation 2: if P (1)+Δ P _Order(1)＞P _Max(1), then have: $\left\{\begin{array}{c}\mathrm{\Δ\; P}\left(1\right)=P_{\mathrm{Max}}\left(1\right)-P\left(1\right)\\ {\mathrm{\Δ\; P}}_{\mathrm{Order}}\left(2\right)={\mathrm{\Δ\; P}}_{\mathrm{Order}}\left(1\right)-\mathrm{\Δ\; P}\left(1\right)\end{array}\right.$ 4..

Direct current system as to prioritization the 2nd is carried out power division, 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 then arranged _Order(2) distribute power to finish.

Situation 2: if P (2)+Δ P _Order(2)＞P _Max(2), then have, $\left\{\begin{array}{c}\mathrm{\Δ\; P}\left(2\right)=P_{\mathrm{Max}}\left(2\right)-P\left(2\right)\\ {\mathrm{\Δ\; P}}_{\mathrm{Order}}\left(3\right)={\mathrm{\Δ\; P}}_{\mathrm{Order}}\left(2\right)-\mathrm{\Δ\; P}\left(2\right)\end{array}\right.$

To sum up, carry out power division one by one from height to low order according to priority, and the like, all assign or given all direct current systems to distribute power, order until power:

P′(i)＝P(i)+ΔP(i) ⑤；

Situation 1: if P (i)+Δ P _Order(i)≤P _Max(i), then 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), then have: $\left\{\begin{array}{c}\mathrm{\Δ\; P}\left(i\right)=P_{\mathrm{Max}}\left(i\right)-P\left(i\right)\\ {\mathrm{\Δ\; P}}_{\mathrm{Order}}(i+1)={\mathrm{\Δ\; P}}_{\mathrm{Order}}\left(i\right)-\mathrm{\Δ\; P}\left(i\right)\end{array}\right.$ 7..

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

(2) coordinate controlling schemes based on the alternating current-direct current of uniform distribution principle:

As shown in Figure 3, Fig. 3 be the embodiment of the invention coordinate the flow chart of controlling schemes based on the direct current system of uniform distribution principle; 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 considers still that to each direct current system some transmission line reaches the Power Limitation value before and after power shortage distributes, and actual power shortage is not necessarily mean allocation.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 satisfies the requirement of uniform distribution principle:

If $\frac{{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}-{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}^{\′}}{n-m}\≤\mathrm{Min}\{P_{\mathrm{Max}}\left(1\right)-P\left(1\right),\·\·\·,P_{\mathrm{Max}}\left(i\right)-P\left(i\right),\·\·\·,P_{\mathrm{Max}}\left(n\right)-P\left(n\right)\}$ 8.,

The 8. middle min of formula then has for getting minimum value function:

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

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

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

If $\frac{{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}-{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}^{\′}}{n-m}>\mathrm{Min}\{P_{\mathrm{Max}}\left(1\right)-P\left(1\right),\·\·\·,P_{\mathrm{Max}}\left(i\right)-P\left(i\right),\·\·\·,P_{\mathrm{Max}}\left(n\right)-P\left(n\right)\}$ 10.,

Then have:

Make Δ P _Min(j)=min{P _Max(1)-P (1) ..., P _Max(i)-P (i) ..., P _Max(n)-and 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 the corresponding j of minimum value returns direct current system.

Return direct current then for earlier the j that filters out and distribute power, promptly have: P ' (j)=P (j)+Δ P _Min(j).

Step C: weed out the direct current system that distributes power, the residue direct current system is carried out again step 1 and step 2 are described judges whether direct current system satisfies the uniform distribution principle, and distribute power.

The power master control amount that needs to distribute needs the said Δ P that has distributed of deduction step C _Min(j) part; And the like, all assign or given all direct current systems to distribute power until power.

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

(3) coordinate controlling schemes based on the alternating current-direct current of power termination rate equal principle:

As shown in Figure 4, Fig. 4 be the embodiment of the invention coordinate the flow chart of controlling schemes based on the direct current system of power termination rate equal principle; Power termination rate equal principle; After promptly distributing power shortage; Guarantee on the DC line of every normal operation that 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 ${\mathrm{\Δ\; P}}_{\mathrm{\Σ}}\≤\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\mathrm{Max}}\left(i\right)-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)$

Then have: $\mathrm{\ϵ}=\frac{{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\mathrm{Max}}\left(i\right)}$

In the formula

; ε is a direct current system transmitted power load factor; With respect to the maximum transmitted power of direct current system; Therefore the ε span has in [0,1] interval:

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

And $\left\{\begin{array}{c}\mathrm{\Δ\; P}\left(1\right)={\mathrm{\ϵ\; P}}_{\mathrm{Max}}\left(1\right)-P\left(1\right)\\ .\\ .\\ .\\ \mathrm{\Δ\; P}\left(i\right)={\mathrm{\ϵ\; P}}_{\mathrm{Max}}\left(i\right)-P\left(i\right)\\ .\\ .\\ .\\ \mathrm{\Δ\; P}\left(n\right)={\mathrm{\ϵ\; P}}_{\mathrm{Max}}\left(n\right)-P\left(n\right)\end{array}\right.$

Distribute power to finish.

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

Then have:

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

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

Show and to have distributed power for all direct current systems, 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 done further detailed description.

Embodiment

Sending system outside with China's Chongqing of Sichuan electrical network southwest water power alternating current-direct current is object; Adopt the direct current power emergency control can reduce the quantity that sending excises 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, reach the effect of defence line, electrical network second road control measure.In instance; The transmission line of alternation current catastrophic failure that is parallelly connected state with direct current system is broken off; Its transmitted power of initially bearing need 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.Instance adopts based on the alternating current-direct current of power termination rate equal principle and coordinates controlling schemes; Control effect such as Fig. 5 and shown in Figure 6; Wherein Fig. 5 is for being dispensed to power controlling 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 the Deyang～Baoji high-voltage direct current; Its load factor is 1, promptly 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 sketch map; This figure shows that employing can obviously improve the stability of system based on the alternating current-direct current coordination controlling schemes of power termination rate equal principle; The AC system power fluctuation can be calmed down in the short time; System damping is stronger, has reached the target of alternating current-direct current coordination control.

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 the whole AC and DC system condition, under the various operational mode of system, check comparison, thereby confirm optimal case.

Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although the present invention has been carried out detailed explanation with reference to the foregoing description; Under the those of ordinary skill in field be to be understood that: still can specific embodiments of the invention make amendment or be equal to replacement; 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 the claim scope of the present invention.

Claims (10)

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

(1) coordinates control based on the alternating current-direct current of priority principle;

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

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

2. alternating current-direct current control method for coordinating as claimed in claim 1 is characterized in that, in said (1), makes 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; Said direct current system based on the priority principle is coordinated control and is carried out power division according to priority one by one from height to low order, all assigns or give all direct current systems to distribute power until power.

3. alternating current-direct current control method for coordinating as claimed in claim 2 is characterized in that, the direct current system of the ordering the 1st of said 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), then has: Δ P (1)=Δ P _Order(1) 3., power division finishes;

If P (1)+Δ P _Order(1)＞P _Max(1), then have: $\left\{\begin{array}{c}\mathrm{\Δ\; P}\left(1\right)=P_{\mathrm{Max}}\left(1\right)-P\left(1\right)\\ {\mathrm{\Δ\; P}}_{\mathrm{Order}}\left(2\right)={\mathrm{\Δ\; P}}_{\mathrm{Order}}\left(1\right)-\mathrm{\Δ\; P}\left(1\right)\end{array}\right.$ 4., the direct current system that continues to take second place to priority is distributed power.

4. alternating current-direct current control method for coordinating as claimed in claim 2 is characterized in that, the direct current system of the ordering i of said priority is carried out power division comprise: order

P′(i)＝P(i)+ΔP(i) ⑤；

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

If P (i)+Δ P _Order(i)＞P _Max(i), then have: $\left\{\begin{array}{c}\mathrm{\Δ\; P}\left(i\right)=P_{\mathrm{Max}}\left(i\right)-P\left(i\right)\\ {\mathrm{\Δ\; P}}_{\mathrm{Order}}(i+1)={\mathrm{\Δ\; P}}_{\mathrm{Order}}\left(i\right)-\mathrm{\Δ\; P}\left(i\right)\end{array}\right.$ 7., the direct current system that continues to take second place to priority is distributed power, all assigns or give all direct current systems to distribute power until power;

If distributed power for all direct current systems, still have power unallocated intact, then 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.

5. alternating current-direct current control method for coordinating as claimed in claim 1 is characterized in that, in said (2), makes 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 said uniform distribution principle is coordinated control and is comprised the steps:

A, judge whether direct current system satisfies 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 steps A.

6. alternating current-direct current control method for coordinating as claimed in claim 5 is characterized in that, in the said steps A, the calculating formula that satisfies the uniform distribution principle is following:

If $\frac{{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}-{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}^{\′}}{n-m}\≤\mathrm{Min}\{P_{\mathrm{Max}}\left(1\right)-P\left(1\right),\·\·\·,P_{\mathrm{Max}}\left(i\right)-P\left(i\right),\·\·\·,P_{\mathrm{Max}}\left(n\right)-P\left(n\right)\}$ 8.;

Then have: $\left\{\begin{array}{c}{P}^{\′}\left(1\right)=P\left(1\right)+\mathrm{\Δ\; P}\left(1\right)\\ .\\ .\\ .\\ P^{\′}\left(i\right)=P\left(i\right)+\mathrm{\Δ\; P}\left(i\right)\\ .\\ .\\ .\\ P^{\′}\left(n\right)=P\left(n\right)+\mathrm{\Δ\; P}\left(n\right)\end{array}\right.$ 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, $\mathrm{\Δ\; P}\left(1\right)=\mathrm{\Δ\; P}\left(i\right)=\·\·\·=\mathrm{\Δ\; P}\left(n\right)=\frac{{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}-{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}^{\′}}{n-m}.$

7. alternating current-direct current control method for coordinating as claimed in claim 5 is characterized in that, among the said step B, the direct current system of restriction uniform distribution principle is the direct current system that does not satisfy the uniform distribution principle of steps A, and computing formula is following:

If $\frac{{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}-{\mathrm{\Δ\; P}}_{\mathrm{\Σ}}^{\′}}{n-m}>\mathrm{Min}\{P_{\mathrm{Max}}\left(1\right)-P\left(1\right),\·\·\·,P_{\mathrm{Max}}\left(i\right)-P\left(i\right),\·\·\·,P_{\mathrm{Max}}\left(n\right)-P\left(n\right)\}$ 10.;

Then:

Make Δ P _Min(j)=min{P _Max(1)-P (1) ..., P _Max(i)-P (i) ..., P _Max(n)-and 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 the corresponding j of 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).

8. alternating current-direct current control method for coordinating as claimed in claim 5 is characterized in that, among the said step C, the gross power controlled quentity controlled variable that next time need distribute need be rejected the said Δ P that has distributed of step B _Min(j) part is about to j and returns 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, all assign or give all direct current systems to distribute power until power.

9. alternating current-direct current control method for coordinating as claimed in claim 1 is characterized in that, in said (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; Said alternating current-direct current based on power termination rate equal principle is coordinated control and is comprised:

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

Then have:

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

In the formula

; ε is a 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; Then 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 $\left\{\begin{array}{c}\mathrm{\Δ\; P}\left(1\right)={\mathrm{\ϵ\; P}}_{\mathrm{Max}}\left(1\right)-P\left(1\right)\\ .\\ .\\ .\\ \mathrm{\Δ\; P}\left(i\right)={\mathrm{\ϵ\; P}}_{\mathrm{Max}}\left(i\right)-P\left(i\right)\\ .\\ .\\ .\\ \mathrm{\Δ\; P}\left(n\right)={\mathrm{\ϵ\; P}}_{\mathrm{Max}}\left(n\right)-P\left(n\right)\end{array}\right.$

Then power division finishes;

If ${\mathrm{\Δ\; P}}_{\mathrm{\Σ}}>\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\mathrm{Max}}\left(i\right)-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}P\left(i\right)$ Then have:

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

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

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.

10. like each described alternating current-direct current control method for coordinating among the claim 1-9, it is characterized in that said method is applicable to that the ac and dc systems that contains many times direct currents coordinates the coordination control between control or the many direct current systems.

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