Capability Chart For Distributed Reactive Power Resources

Capability Chart for Distributed Reactive Power Resources

Feb 29,2020

The ubiquity of synchronous generation should not be assumed in highly renewable power systems. Various problems may consequently arise, not least of which are the difficulties entailed in maintaining regional reactive power balance. Offering a potential solution to such problems, modern renewable generator technologies offer controllable reactive power resources. As many of these generators will be embedded in distribution networks, their incorporation into transmission system operational and planning activities appears challenging. An extension of the capability chart concept offers insight here: for a given active power exchange between the transmission system and a distribution network section, the range of controllable reactive power typically available is of interest. This aggregate capability depends on the innate machine capabilities of the distributed generators and on the prevailing conditions within the distribution network. Novel optimisation techniques are useful in addressing the latter point, offering a means to identify the combination of power flow profiles within the distribution system most restrictive to reactive power provision. The capability chart thus derived gives the dependable range of reactive power available, under the assumption that each generator is operated to locally maximize its own reactive power contribution.

	0.75	0.76	0.77	0.78	0.79	0.80	0.81	0.82	0.83	0.84	0.85	0.86	0.87	0.88	0.89	0.90
0.90	298	282	265	248	230	213	194	175	156	136	115	94	72	49	25	0	0.90
0.91	320	304	287	270	253	236	217	199	180	160	140	118	97	74	50	26	0.91
0.92	342	326	310	294	277	259	241	223	204	185	165	144	122	100	77	52	0.92
0.93	365	350	334	318	301	284	266	248	230	211	191	170	149	127	104	80	0.93
0.94	389	374	359	343	326	310	292	275	257	238	218	198	177	156	133	109	0.94
0.95	415	400	385	369	353	337	320	303	285	266	247	228	207	186	163	140	0.95
0.96	443	428	413	398	383	367	350	333	316	298	279	259	239	218	196	173	0.96
0.97	473	459	445	430	415	400	383	367	350	332	314	295	275	254	233	210	0.97
0.98	509	496	482	467	453	438	422	406	389	372	354	336	316	296	275	253	0.98
0.99	555	542	528	515	501	486	471	456	439	423	406	388	369	350	329	308	0.99
1.00	661	650	638	626	613	600	586	572	558	543	527	510	493	475	456	436	1.00
	0.75	0.76	0.77	0.78	0.79	0.80	0.81	0.82	0.83	0.84	0.85	0.86	0.87	0.88	0.89	0.90