Dynamic reactive power optimisation of UHVDC converter station considering coordination of synchronous condenser and system filtering requirements

Parameter setting method of coordinated control between synchronous condenser and DC system based on dynamic reactive power optimization

“…It should be pointed out here that since the work of this paper is based on [11], the applicable conditions of the method proposed in this paper are consistent with those in [11], that is, the converter stations at the sending and receiving ends adopt constant power and constant voltage control modes respectively.…”

“…The previous subsystem is composed of N f groups AC filter and N c groups of shunt capacitors, and the latter one contains converters (θ is control angle) and converter converter transformers (k dT is its ratio). It should be pointed out here that since the work of this paper is based on [11], the applicable conditions of the method proposed in this paper are consistent with those in [11], that is, the converter stations at the sending and receiving ends adopt constant power and constant voltage control modes respectively.…”

“…FIGURE 6 The 96-period curves for DC transmission power and AC voltage of equivalent power the power flow with the reactive power of synchronous condenser Q GT from −300 to 600 Mvar by 10 Mvar. S2: Use the basic data of the example in Section 5.1.1, and the dynamic reactive power method of UHVDC converter station considering the coordination of synchronous condenser proposed in [11] to obtain the ideal results. S3: Based on the basic data and calculation results of S2, the proposed method is used to set the control parameters of synchronous condenser and DC system.…”

“… S1 : Set AC voltage of equivalent power $$E = 1.05{\rm{p}}{\rm{.u}}{\rm{. }}$$ and DC transmission power $${P_d} = 2000{\rm{MW}}$$, then calculate the power flow with the reactive power of synchronous condenser Q GT from −300 to 600 Mvar by 10 Mvar. S2 : Use the basic data of the example in Section 5.1.1, and the dynamic reactive power optimization method of UHVDC converter station considering the coordination of synchronous condenser proposed in [11] to obtain the ideal results. S3 : Based on the basic data and calculation results of S2, the proposed method is used to set the control parameters of synchronous condenser and DC system. The reactive power fusion threshold is $${\varepsilon _{QGT}} = 100{\rm{Mvar}}$$, reactive power margins are $$\Delta {Q_1} = 295{\rm{Mvar}}$$, $$\Delta {Q_2} = 147.5{\rm{Mvar}}$$ and $$\Delta {Q_3} = 73.75{\rm{Mvar}}$$, and voltage margin $${\varepsilon _{UH}} = 2.5{\rm{kV}}$$. S4 : Based on the basic data of S2, the results of S3, and the engineering strategy of Section 2.1, the power flow of 96 periods is calculated. S5 : Based on the basic data of S2 and the engineering strategy of Section 2.1, the power flow of 96 periods is calculated without considering the coordination between synchronous condenser and DC system ($${Q_{dexc,{\rm{aim}}}} = 0{\rm{Mvar}}$$, $${Q_{GT}} = 0{\rm{Mvar}}$$). S6 : Based on the basic data of S2 and the engineering strategy of Section …”

“…In order to make up for this deficiency, on the premise of satisfying the transient reactive power support of synchronous condenser, we propose a dynamic reactive power optimization method of converter station considering the coordination of synchronous condenser [11]. Ideally, the daily operation times of discrete devices in converter station can be greatly reduced through their space‐temporal coordinated optimization with synchronous condenser.…”